Communication equipment and communication methods

Abstract

An embodiment of the present application provides a communication device and a communication method. The communication device is configured to receive a first signal and a second signal from a same device, and the second signal instructs the communication device to enter a connected state. The communication device includes a first branch and a second branch. The first branch includes a first frequency-to-amplitude converter configured to obtain first amplitude information of a third signal, the third signal being a signal obtained by performing frequency mixing on the first signal and a first local oscillator signal. The second branch is configured to demodulate a fourth signal, the fourth signal being a signal obtained by performing frequency mixing on the second signal and a second local oscillator signal, the second local oscillator signal being a signal obtained by performing frequency offset compensation on the first local oscillator signal based on the first amplitude information, and the second branch includes a second frequency-to-amplitude converter, and a linear operating interval of the second frequency-to-amplitude converter is smaller than a linear operating interval of the first frequency-to-amplitude converter. In this way, the signal demodulation performance of the communication device can be improved.

Description

[Technical Field]

[0001] The embodiments of this application relate to the field of communication technology, more specifically to communication devices and communication methods. [Background technology]

[0002] In wireless communication systems, signals are radiated into space through antennas in the form of electromagnetic waves. Generally, before transmitting a signal, the transmitting device performs modulation processing on the signal, upconverting the baseband signal spectrum to a higher carrier frequency so that the communication system can operate on the assigned channel. For receiving devices, the receiving device needs to perform downconversion and demodulation processing on the signal transmitted by the transmitting device in order to obtain the information transmitted by the transmitting device. Demodulation is the reverse process of modulation, and the demodulation method varies depending on the modulation method. For example, a signal Inside If the information is modulated on the carrier frequency using frequency shift keying (FSK) modulation, the receiving device needs to acquire the transmitted information at the frequency of the received signal during the demodulation process.

[0003] The baseband signal transmitted by the transmitting device uses the radio frequency after it has been upconverted. Therefore, before demodulating the received signal, the receiving device must first perform frequency reduction on the received signal. Generally, the receiving device may perform frequency mixing on the received signal and the local oscillator signal generated by the receiving device in order to complete the downconversion process for the received signal. However, due to the stability of the receiving device's oscillator, the surrounding environment, and other factors, there is usually an offset between the ideal frequency and the frequency of the local oscillator signal generated by the receiving device. In this case, there is an error in the baseband signal obtained by demodulating the received signal by the receiving device. As a result, the demodulation performance of the receiving device is seriously affected. [Overview of the project]

[0004] Embodiments of the present invention provide a communication device and a communication method. The communication device can perform frequency offset correction on the local oscillator signal generated by the communication device. In this way, the error in the baseband signal obtained by demodulating the signal received by the communication device is reduced, and the demodulation performance of the receiving device can be improved.

[0005] A communication device is provided according to the first aspect. The communication device is configured to receive a first signal and a second signal, both of which are from the same device, and the second signal instructs the communication device to enter a connected state. The communication device includes a first branch and a second branch. The first branch includes a first frequency-amplitude converter configured to acquire first amplitude information of a third signal, the third signal being a signal acquired by performing frequency mixing on the first signal and a first local oscillator signal, the first local oscillator signal being a local oscillator signal generated by the communication device. The second branch is configured to demodulate a fourth signal, the fourth signal being a signal acquired by performing frequency mixing on the second signal and a second local oscillator signal, the second local oscillator signal being a signal acquired by performing frequency offset correction on the first local oscillator signal based on the first amplitude information, and the second branch includes a second frequency-amplitude converter, the linear operating interval corresponding to the second frequency-amplitude converter being smaller than the linear operating interval corresponding to the first frequency-amplitude converter.

[0006] In this technical solution, the communication device first obtains the first amplitude information of a third signal obtained by performing frequency mixing on a first signal and a first local oscillator signal using a first frequency-amplitude converter on a first branch. Next, the communication device demodulates a fourth signal obtained by performing frequency mixing on a second local oscillator signal and a second signal using a second branch, the second local oscillator signal being a signal obtained by performing frequency offset correction on the first local oscillator signal based on the first amplitude information. The first local oscillator signal has a frequency offset, and the linear operating interval corresponding to the first frequency-amplitude converter on the first branch is set to be greater than the linear operating interval corresponding to the second frequency-amplitude converter, so that the frequency of the third signal obtained by performing frequency mixing on the first signal and the first local oscillator signal does not exceed the linear operating interval corresponding to the first frequency-amplitude converter. Therefore, the first frequency-amplitude converter can accurately obtain the first amplitude information of the third signal in order to subsequently perform accurate frequency offset correction on the first local oscillator signal based on the first amplitude information.

[0007] Furthermore, the communication device demodulates the fourth signal obtained by performing frequency mixing on the second local oscillator signal and the second signal using the second branch. Since the second local oscillator signal is obtained by performing frequency offset correction on the first local oscillator signal, the frequency offset value of the fourth signal is smaller than the frequency offset value of the signal obtained by performing frequency mixing on the first local oscillator signal and the second signal. In this way, the fourth signal can still be accurately demodulated when the linear operating interval corresponding to the second frequency-amplitude converter is set smaller than the linear operating interval of the first frequency-amplitude converter. Therefore, the demodulation performance of the communication device is not significantly affected.

[0008] Referring to the first aspect, in some implementations of the first aspect, the communication device further includes a frequency offset estimation module and a local oscillator. A first frequency-amplitude converter is further configured to send first amplitude information to the frequency offset estimation module. The frequency offset estimation module is configured to obtain a first frequency offset value based on the first amplitude information and to send the first frequency offset value to the local oscillator. The local oscillator is configured to perform frequency offset correction on the first local oscillator signal based on the first frequency offset value to obtain a second local oscillator signal.

[0009] Referring to the first aspect, in some implementations of the first aspect, the first frequency-amplitude converter includes a first phase shift unit, and the first phase shift unit is first frequency- amplitude Based on the curve, different phase shifts are introduced to signals of different frequencies. The second frequency-amplitude converter includes a second phase shift unit, and the second phase shift unit is second frequency- amplitude Based on the curve, different phase shifts are introduced to signals of different frequencies, and the second frequency - amplitude The slope of the curve is the first frequency - amplitude It is greater than the slope of the curve.

[0010] Referring to the first aspect, in some implementations of the first aspect, a differential frequency modulation scheme is used for the second signal. The second frequency-amplitude converter is configured to acquire third amplitude information of the fourth signal. The second branch is further configured to acquire the frequency difference of the fourth signal transmitted in adjacent time units based on the third amplitude information of the fourth signal, where the frequency of the fourth signal transmitted in the i-th time unit is f(i)=mod[f(i-1)+Δf1(i),B1], where Δf1(i) is the difference between the frequency of the i-th fourth signal and the frequency of the (i-1)-th fourth signal in the sequence of the fourth signal, where B1 is a pre-set first bandwidth value, where i is an integer greater than 1, and to acquire the modulation information carried by the fourth signal based on the frequency difference of the fourth signal.

[0011] Since the time interval between two consecutive time units is extremely short, even if a residual frequency offset exists in the local oscillator signal generated by the communication device, the residual frequency offset of the local oscillator signals generated by the communication device in two consecutive time units can be considered the same. In this way, the residual frequency offset of the local oscillator signal generated by the communication device can be canceled out by subtracting the frequencies of the fourth signal in the two consecutive time units (i.e., differential frequency modulation). Therefore, the demodulation performance of the communication device is not further affected.

[0012] Referring to the first aspect, in some implementations of the first aspect, a differential frequency modulation scheme is used for the first signal, and the first branch is configured to obtain the modulation information carried by the third signal based on the frequency difference of the third signal transmitted in adjacent time units, where the frequency of the third signal transmitted in the j-th time unit is f(j)=mod[f(j-1)+Δf1(j),B3], where Δf1(j) is the difference between the frequency of the j-th third signal and the frequency of the (j-1)-th third signal in the sequence of the third signal, B3 is a pre-set third bandwidth value, and j is an integer greater than 1, and based on the frequency difference of the third signal, it obtains the modulation information carried by the third signal.

[0013] Since the time interval between two consecutive time units is extremely short, even if a residual frequency offset exists in the local oscillator signal generated by the communication device, the residual frequency offset of the local oscillator signals generated by the communication device in two consecutive time units can be considered the same. In this way, the residual frequency offset of the local oscillator signal generated by the communication device can be canceled out by subtracting the frequencies of the third signal in the two consecutive time units (i.e., differential frequency modulation). Therefore, the demodulation performance of the communication device is not further affected.

[0014] Referring to the first aspect, in some implementations of the first aspect, the communication device is further configured to receive first data and second data.

[0015] In implementation, the first data and first signal are transmitted using FDM, and / or the second data and second signal are transmitted using FDM, and the frequency guard interval between the first signal and the first data is greater than the frequency guard interval between the second signal and the second data.

[0016] The first signal is used to perform frequency offset correction on the first local oscillator signal, and the second signal instructs the communication device to enter the connected state. Thus, the communication device first performs frequency offset correction on the first local oscillator signal based on the first signal, and then demodulates the received second signal based on the second local oscillator signal obtained by performing frequency offset correction on the first local oscillator signal. Because a frequency offset exists in the process in which the communication device performs frequency offset correction on the first local oscillator signal, the frequency guard interval between the first signal and the first data is set larger (compared to the frequency guard interval between the second signal and the second data), thereby preventing the first data, which is normally transmitted in an adjacent frequency band, from entering the first branch. In the process in which the received second signal is demodulated based on the second local oscillator signal obtained by performing frequency offset correction on the first local oscillator signal, the frequency offset value of the second local oscillator signal is smaller than the frequency offset value of the first local oscillator signal because the frequency offset correction is performed on the first local oscillator signal. Therefore, the frequency guard interval between the second signal and the second data is set smaller (compared to the frequency guard interval between the first signal and the first data), thereby preventing the second data, which is normally transmitted in an adjacent frequency band, from entering the second branch. Furthermore, a smaller guard interval helps improve system resource utilization.

[0017] Referring to the first aspect, in some implementations of the first aspect, the communication device is further configured to obtain configuration information, where the configuration information indicates at least one of the following: the transmission period of the first signal, the bit sequence of the first signal, the frequency guard interval between the first signal and the first data, and the frequency guard interval between the second signal and the second data.

[0018] Referring to the first aspect, in some implementations of the first aspect, the modulation order of the first signal is less than the modulation order of the second signal, the first signal is a single-frequency signal, or the modulation order of the first signal is 2.

[0019] A lower modulation order indicates that less information is carried by each symbol of the signal and that fewer amplitudes are converted from the frequency by the communication device. In this way, in the same interval, a smaller number of amplitudes indicates that the distance between the amplitudes is wider. Therefore, the communication device has better demodulation performance for the first signal.

[0020] Referring to the first aspect, in some implementations of the first aspect, the transmission power of the first signal is greater than the transmission power of the second signal.

[0021] The transmission power of the first signal is greater than the transmission power of the second signal. In this way, the communication device can obtain a first signal with strong signal strength so that better demodulation performance can be obtained for the first signal.

[0022] According to a second aspect, a communication device is provided. The communication device is configured to receive a second signal, and the second signal instructs the communication device to enter a connected state. The communication device includes a first branch and a second branch. The first branch includes a first frequency-amplitude converter configured to obtain second amplitude information of a fifth signal, the fifth signal being a signal obtained by performing frequency mixing on the second signal and a first local oscillator signal, and the first local oscillator signal being a local oscillator signal generated by the communication device. The second branch is configured to demodulate a sixth signal, the sixth signal being a signal obtained by performing frequency mixing on the second signal and a second local oscillator signal, and the second local oscillator signal being a signal obtained by performing frequency offset correction on the first local oscillator signal based on the second amplitude information. The second branch includes a second frequency-amplitude converter, and a linear operating interval corresponding to the second frequency-amplitude converter is smaller than a linear operating interval corresponding to the first frequency-amplitude converter.

[0023] In this technical solution, the communication device first obtains the second amplitude information of the fifth signal obtained by performing frequency mixing on the second signal and the first local oscillator signal by using the first frequency-amplitude converter on the first branch. Then, the communication device demodulates the sixth signal obtained by performing frequency mixing on the second local oscillator signal and the second signal by the second branch, and the second local oscillator signal is a signal obtained by performing frequency offset correction on the first local oscillator signal based on the second amplitude information. Since the first local oscillator signal has a frequency offset, the linear operating interval corresponding to the first frequency-amplitude converter on the first branch is set to be larger than the linear operating interval corresponding to the second frequency-amplitude converter, whereby the 2The frequency of the fifth signal, obtained by performing frequency mixing on the signal and the first local oscillator signal, does not exceed the linear operating interval corresponding to the first frequency-amplitude converter. Therefore, the first frequency-amplitude converter can accurately acquire the second amplitude information of the fifth signal in order to subsequently perform accurate frequency offset correction on the first local oscillator signal based on the second amplitude information.

[0024] Furthermore, the communication device demodulates the sixth signal obtained by performing frequency mixing on the second local oscillator signal and the second signal using the second branch. Since the second local oscillator signal is obtained by performing frequency offset correction on the first local oscillator signal, the frequency offset value of the sixth signal is smaller than the frequency offset value of the signal obtained by performing frequency mixing on the first local oscillator signal and the second signal. In this way, the sixth signal can still be accurately demodulated when the linear operating interval corresponding to the second frequency-amplitude converter is set smaller than the linear operating interval of the first frequency-amplitude converter. Therefore, the demodulation performance of the communication device is not significantly affected.

[0025] Referring to the second aspect, in some implementations of the second aspect, the communication device further includes a frequency offset estimation module and a local oscillator. A first frequency-amplitude converter is further configured to send second amplitude information to the frequency offset estimation module. The frequency offset estimation module is configured to obtain a second frequency offset value based on the second amplitude information and to send the second frequency offset value to the local oscillator. The local oscillator is configured to perform frequency offset correction on the first local oscillator signal based on the second frequency offset value to obtain a second local oscillator signal.

[0026] Referring to the second aspect, in some implementations of the second aspect, the first frequency-amplitude converter includes a first phase shift unit, and the first phase shift unit is first frequency- amplitudeBased on the curve, different phase shifts are introduced to signals of different frequencies. The second frequency-amplitude converter includes a second phase shift unit, and the second phase shift unit is second frequency- amplitude Based on the curve, different phase shifts are introduced to signals of different frequencies, and the second frequency - amplitude The slope of the curve is the first frequency - amplitude It is greater than the slope of the curve.

[0027] Referring to the second aspect, in some implementations of the second aspect, a differential frequency modulation scheme is used for the second signal, and the second branch is further configured to obtain the frequency difference of filtered sixth signals transmitted in adjacent time units, where the frequency of the filtered sixth signal transmitted in the i-th time unit is f(i)=mod[f(i-1)+Δf2(i),B2], where Δf2(i) is the difference between the frequency of the i-th sixth signal and the frequency of the (i-1)-th sixth signal in the sequence of filtered sixth signals, B2 is a pre-set second bandwidth value, i is an integer greater than 1, and based on the frequency difference of the filtered sixth signals, the second branch is configured to obtain the modulation information carried in the filtered sixth signal.

[0028] Since the time interval between two consecutive time units is extremely short, even if a residual frequency offset exists in the local oscillator signal generated by the communication device, the residual frequency offset of the local oscillator signals generated by the communication device in two consecutive time units can be considered to be the same. In this way, the residual frequency offset of the local oscillator signal generated by the communication device can be canceled out by subtracting the frequencies of the sixth signal in the two consecutive time units (i.e., differential frequency modulation). Therefore, the demodulation performance of the communication device is not further affected.

[0029] A communication device is provided according to a third aspect. The communication device is configured to receive a first signal and a second signal, both of which originate from the same device, and the second signal instructs the communication device to enter a connected state. The communication device includes a first branch and a second branch. The first branch includes a first filter configured to filter a third signal, the third signal being a signal obtained by performing frequency mixing on the first signal and a first local oscillator signal, the first local oscillator signal being a local oscillator signal generated by the communication device. The second branch includes a second filter configured to filter a fourth signal, the fourth signal being a signal obtained by performing frequency mixing on the second signal and a second local oscillator signal, the second local oscillator signal being a signal obtained by performing frequency offset correction on the first local oscillator signal based on first amplitude information of the third signal, the bandwidth of the second filter being narrower than the bandwidth of the first filter.

[0030] In this technical solution, the communication device first filters a third signal obtained by performing frequency mixing on a first signal and a first local oscillator signal using a first filter on a first branch. Next, the communication device filters a fourth signal obtained by performing frequency mixing on a second signal and a second local oscillator signal using a second filter on a second branch, the second local oscillator signal being obtained by performing frequency offset correction on the first local oscillator signal based on the first amplitude information of the third signal. Since the first local oscillator signal has a frequency offset, the bandwidth of the first filter on the first branch is set to be larger than the bandwidth of the second filter, so that the first filter still does not filter the third signal even if the first local oscillator signal has a frequency offset. In this way, frequency offset correction can be subsequently performed on the first local oscillator signal based on the third signal.

[0031] Furthermore, the communication device filters the fourth signal, which is obtained by frequency mixing of the second signal and the second local oscillator signal, by using a second filter on the second branch. Since the second local oscillator signal is obtained by performing frequency offset correction on the first local oscillator signal, the frequency offset value of the fourth signal is smaller than the frequency offset value of the signal obtained by frequency mixing of the first local oscillator signal and the second signal. In this way, the bandwidth of the second filter on the second branch is set to a smaller bandwidth (compared to the bandwidth of the first filter), ensuring that the second filter does not filter the fourth signal even if residual frequency offset exists, and because the second filter has a narrow passband, it can remove out-of-band noise. This reduces the noise level of the communication device and improves the performance of the communication layer in demodulating the fourth signal.

[0032] Referencing the third aspect, in some implementations of the third aspect, the first branch further includes a first frequency-amplitude converter configured to acquire first amplitude information. The communication device further includes a frequency offset estimation module and a local oscillator. The first frequency-amplitude converter is further configured to send the first amplitude information to the frequency offset estimation module. The frequency offset estimation module is configured to acquire a first frequency offset value based on the first amplitude information and to send the first frequency offset value to the local oscillator. The local oscillator is configured to perform frequency offset correction on the first local oscillator signal based on the first frequency offset value to acquire a second local oscillator signal.

[0033] Referring to the third aspect, in some implementations of the third aspect, the second branch further includes a second frequency-amplitude converter configured to demodulate a filtered fourth signal, wherein the linear operating interval corresponding to the second frequency-amplitude converter is smaller than the linear operating interval corresponding to the first frequency-amplitude converter.

[0034] Referring to the third aspect, in some implementations of the third aspect, the first frequency-amplitude converter includes a first phase shift unit, and the first phase shift unit is first frequency- amplitude Based on the curve, different phase shifts are introduced to signals of different frequencies. The second frequency-amplitude converter includes a second phase shift unit, and the second phase shift unit is second frequency- amplitude Based on the curve, different phase shifts are introduced to signals of different frequencies, and the second frequency - amplitude The slope of the curve is the first frequency - amplitude It is greater than the slope of the curve.

[0035] Referring to the third aspect, in some implementations of the third aspect, a differential frequency modulation scheme is used for the second signal. The second frequency-amplitude converter is configured to acquire the third amplitude information of the fourth signal. The second branch is further configured to acquire the modulation information carried by the filtered fourth signal based on the third amplitude information of the fourth signal, where the frequency of the fourth signal transmitted in the i-th time unit is f(i)=mod[f(i-1)+Δf1(i),B1], where Δf1(i) is the difference between the frequency of the i-th fourth signal and the frequency of the (i-1)-th fourth signal in the sequence of the fourth signal, B1 is a pre-set first bandwidth value, and i is an integer greater than 1, based on the frequency difference of the filtered fourth signal.

[0036] Referring to the third aspect, in some implementations of the third aspect, a differential frequency modulation scheme is used for the first signal, and the first branch is configured to obtain the modulation information carried by the third signal based on the frequency difference of the third signal transmitted in adjacent time units, where the frequency of the third signal transmitted in the j-th time unit is f(j)=mod[f(j-1)+Δf1(j),B3], where Δf1(j) is the difference between the frequency of the j-th third signal and the frequency of the (j-1)th third signal in the sequence of the third signal, B3 is a pre-set third bandwidth value, j is an integer greater than 1, and based on the frequency difference of the third signal, it obtains the modulation information carried by the third signal.

[0037] For any technical effects of the possible implementation of the third aspect, please refer to the technical effects of the corresponding implementation of the first aspect. Further details are not provided here.

[0038] A communication device is provided according to the fourth aspect. The communication device is configured to receive a second signal, which instructs the communication device to enter a connected state. The communication device includes a first branch and a second branch. The first branch includes a first filter configured to filter a fifth signal, the fifth signal being a signal obtained by performing frequency mixing on the second signal and a first local oscillator signal, the first local oscillator signal being a local oscillator signal generated by the communication device. The second branch includes a second filter configured to filter a sixth signal, the sixth signal being a signal obtained by performing frequency mixing on the second signal and a second local oscillator signal, the second local oscillator signal being a signal obtained by performing frequency offset correction on the first local oscillator signal based on second amplitude information of the fifth signal, the bandwidth of the second filter being narrower than the bandwidth of the first filter.

[0039] In this technical solution, the communication device first filters the fifth signal, which is obtained by performing frequency mixing on the second signal and the first local oscillator signal, by using a first filter on the first branch. Next, the communication device filters the sixth signal, which is obtained by performing frequency mixing on the second signal and the second local oscillator signal, by using a second filter on the second branch. The second local oscillator signal is a signal obtained by performing frequency offset correction on the first local oscillator signal based on the second amplitude information of the fifth signal. Since the first local oscillator signal has a frequency offset, the bandwidth of the first filter on the first branch is set to be larger than the bandwidth of the second filter, so that the first filter still does not filter the fifth signal, even if the first local oscillator signal has a frequency offset. In this way, frequency offset correction can be subsequently performed on the first local oscillator signal based on the fifth signal.

[0040] Furthermore, the communication device filters the sixth signal, which is obtained by performing frequency mixing on the second signal and the second local oscillator signal, by using a second filter on the second branch. Since the second local oscillator signal is obtained by performing frequency offset correction on the first local oscillator signal, the frequency offset value of the sixth signal is smaller than the frequency offset value of the signal obtained by performing frequency mixing on the first local oscillator signal and the second signal. In this way, the bandwidth of the second filter on the second branch is set to a smaller bandwidth (compared to the bandwidth of the first filter), ensuring that the second filter does not filter the sixth signal even if residual frequency offset exists, and because the second filter has a narrow passband, it can remove out-of-band noise. As a result, the noise level of the communication device is reduced and the performance of demodulating the sixth signal by the communication layer is improved.

[0041] Referring to the fourth aspect, in some implementations of the fourth aspect, the first branch further includes a first frequency-amplitude converter configured to acquire second amplitude information. The communication device further includes a frequency offset estimation module and a local oscillator. The first frequency-amplitude converter is further configured to send the second amplitude information to the frequency offset estimation module. The frequency offset estimation module is configured to acquire a second frequency offset value based on the second amplitude information and to send the second frequency offset value to the local oscillator. The local oscillator is configured to perform frequency offset correction on the first local oscillator signal based on the second frequency offset value to acquire a second local oscillator signal.

[0042] Referring to the fourth aspect, in some implementations of the fourth aspect, the second branch further includes a second frequency-amplitude converter configured to demodulate a filtered sixth signal, wherein the linear operating interval corresponding to the second frequency-amplitude converter is smaller than the linear operating interval corresponding to the first frequency-amplitude converter.

[0043] Referring to the fourth aspect, in some implementations of the fourth aspect, the first frequency-amplitude converter includes a first phase shift unit, and the first phase shift unit is first frequency- amplitude Based on the curve, different phase shifts are introduced to signals of different frequencies. The second frequency-amplitude converter includes a second phase shift unit, and the second phase shift unit is second frequency- amplitude Based on the curve, different phase shifts are introduced to signals of different frequencies, and the second frequency - amplitude The slope of the curve is the first frequency - amplitude It is greater than the slope of the curve.

[0044] Referring to the fourth aspect, in some implementations of the fourth aspect, a differential frequency modulation scheme is used for the second signal, and the second branch is further configured to obtain the frequency difference of a filtered sixth signal transmitted in adjacent time units, where the frequency of the filtered sixth signal transmitted in the i-th time unit is f(i)=mod[f(i-1)+Δf2(i),B2], where Δf2(i) is the difference between the frequency of the i-th sixth signal and the frequency of the (i-1)-th sixth signal in the sequence of filtered sixth signals, B2 is a pre-set second bandwidth value, i is an integer greater than 1, and to obtain the modulation information carried in the filtered sixth signal based on the frequency difference of the filtered sixth signal.

[0045] For the technical effects of any possible implementation of the fourth aspect, please refer to the technical effects of the corresponding implementation of the second aspect. Further details are not provided here.

[0046] For example, in an implementation, the communication device in any of the first to fourth aspects may be an access network device or a chip or circuit within an access network device. In other implementations, the communication device in any of the first to fourth aspects may be a terminal device or a chip or circuit within a terminal device.

[0047] A communication method is provided according to the fifth aspect. The communication method is applied to a communication device, the communication device comprising a first branch and a second branch, the first branch comprising a first frequency-amplitude converter, the second branch comprising a second frequency-amplitude converter, the linear operating interval corresponding to the second frequency-amplitude converter being smaller than the linear operating interval corresponding to the first frequency-amplitude converter, the communication method comprising receiving a first signal and a second signal, both of which are from the same device, the second signal instructing the communication device to enter a connected state, and by using the first frequency-amplitude converter. The method involves acquiring first amplitude information of a third signal, where the third signal is obtained by performing frequency mixing on the first signal and the first local oscillator signal, and the first local oscillator signal is a local oscillator signal generated by a communication device; and demodulating a fourth signal using a second branch, where the fourth signal is obtained by performing frequency mixing on the second signal and the second local oscillator signal, and the second local oscillator signal is obtained by performing frequency offset correction on the first local oscillator signal based on the first amplitude information.

[0048] Referring to the fifth aspect, in some implementations of the fifth aspect, prior to demodulating the fourth signal by the second branch, the communication method further comprises obtaining a first frequency offset value based on first amplitude information, and obtaining a second local oscillator signal by performing frequency offset correction on the first local oscillator signal based on the first frequency offset value.

[0049] Referring to the fifth aspect, in some implementations of the fifth aspect, the first frequency-amplitude converter includes a first phase shift unit, and the first phase shift unit is first frequency- amplitude Based on the curve, different phase shifts are introduced to signals of different frequencies. The second frequency-amplitude converter includes a second phase shift unit, and the second phase shift unit is second frequency- amplitude Based on the curve, different phase shifts are introduced to signals of different frequencies, and the second frequency - amplitude The slope of the curve is the first frequency - amplitude It is greater than the slope of the curve.

[0050] Referring to the fifth aspect, in some implementations of the fifth aspect, a differential frequency modulation scheme is used for the second signal, and the communication method further comprises obtaining third amplitude information of the fourth signal by using a second frequency-amplitude converter, demodulating the fourth signal by the second branch, obtaining the frequency difference of the fourth signal transmitted in adjacent time units by the second branch, where the frequency of the fourth signal transmitted in the i-th time unit is f(i)=mod[f(i-1)+Δf1(i),B1], where Δf1(i) is the difference between the frequency of the i-th fourth signal and the frequency of the (i-1)-th fourth signal in the sequence of the fourth signal, where B1 is a pre-set first bandwidth value, and where i is an integer greater than 1, and obtaining modulation information carried in the fourth signal based on the frequency difference of the fourth signal.

[0051] Referring to the fifth aspect, in some implementations of the fifth aspect, a differential frequency modulation scheme is used for the first signal, and the method is to obtain the frequency difference of a third signal transmitted in adjacent time units based on first amplitude information by a first branch, where the frequency of the third signal transmitted in the j-th time unit is f(j)=mod[f(j-1)+Δf1(j),B3], where Δf1(j) is the difference between the frequency of the j-th third signal and the frequency of the (j-1)-th third signal in the sequence of third signals, B3 is a pre-set third bandwidth value, and j is an integer greater than 1, and further comprises obtaining the modulation information carried by the third signal based on the frequency difference of the third signal.

[0052] For any technical effects of any possible implementation of the fifth aspect, please refer to the technical effects of the corresponding implementation of the first aspect. Further details are not provided here.

[0053] A method of communication is provided according to the sixth aspect. The communication method is applied to a communication device, which includes a first branch and a second branch, the first branch including a first frequency-amplitude converter, the second branch including a second frequency-amplitude converter, the linear operating interval corresponding to the second frequency-amplitude converter being smaller than the linear operating interval corresponding to the first frequency-amplitude converter, the communication method comprising: receiving a second signal, the second signal instructing the communication device to enter a connected state; obtaining second amplitude information of a fifth signal by using the first frequency-amplitude converter, the fifth signal being a signal obtained by performing frequency mixing on the second signal and a first local oscillator signal, the first local oscillator signal being a local oscillator signal generated by the communication device; and demodulating a sixth signal using the second branch, the sixth signal being a signal obtained by performing frequency mixing on the second signal and a second local oscillator signal, the second local oscillator signal being a signal obtained by performing frequency offset correction on the first local oscillator signal based on the second amplitude information.

[0054] Referring to the sixth aspect, in some implementations of the sixth aspect, prior to demodulating the sixth signal by the second branch, the communication method further comprises obtaining a second frequency offset value based on second amplitude information, and obtaining a second local oscillator signal by performing frequency offset correction on the first local oscillator signal based on the second frequency offset value.

[0055] Referring to the sixth aspect, in some implementations of the sixth aspect, the first frequency-amplitude converter includes a first phase shift unit, and the first phase shift unit is first frequency- amplitude Based on the curve, different phase shifts are introduced to signals of different frequencies. The second frequency-amplitude converter includes a second phase shift unit, and the second phase shift unit is second frequency- amplitude Based on the curve, different phase shifts are introduced to signals of different frequencies, and the second frequency - amplitude The slope of the curve is the first frequency - amplitudeIt is greater than the slope of the curve.

[0056] Referring to the sixth aspect, in some implementations of the sixth aspect, a differential frequency modulation scheme is used for the second signal, and demodulating the sixth signal by the second branch involves obtaining the frequency difference of the filtered sixth signal transmitted in adjacent time units, where the frequency of the filtered sixth signal transmitted in the i-th time unit is f(i)=mod[f(i-1)+Δf2(i),B2], where Δf2(i) is the difference between the frequency of the i-th sixth signal and the frequency of the (i-1)-th sixth signal in the sequence of filtered sixth signals, where B2 is a pre-set second bandwidth value, and where i is an integer greater than 1, and obtaining the modulation information carried in the filtered sixth signal based on the frequency difference of the filtered sixth signal.

[0057] For any technical effects of the possible implementation of the sixth aspect, please refer to the technical effects of the corresponding implementation of the second aspect. Further details are not provided here.

[0058] A method of communication is provided according to the seventh aspect. The communication method is applied to a communication device, which includes a first branch and a second branch, the first branch includes a first filter, the second branch includes a second filter, the bandwidth of the second filter is narrower than the bandwidth of the first filter, the communication method includes receiving a first signal and a second signal, both of which are from the same device, the second signal instructing the communication device to enter a connected state, filtering a third signal by using a first filter, the third signal being a signal obtained by performing frequency mixing on the first signal and a first local oscillator signal, the first local oscillator signal being a local oscillator signal generated by the communication device, and filtering a fourth signal by using a second filter, the fourth signal being a signal obtained by performing frequency mixing on the second signal and a second local oscillator signal, the second local oscillator signal being a signal obtained by performing frequency offset correction on the first local oscillator signal based on first amplitude information of the third signal.

[0059] Referring to the seventh aspect, in some implementations of the seventh aspect, the first branch further includes a first frequency-amplitude converter, and the communication method further includes obtaining first amplitude information by using the first frequency-amplitude converter, obtaining a first frequency offset value based on the first amplitude information, and obtaining a second local oscillator signal by performing frequency offset correction on the first local oscillator signal based on the first frequency offset value.

[0060] Referring to the seventh aspect, in some implementations of the seventh aspect, the second branch further includes a second frequency-amplitude converter, the linear operating interval corresponding to the second frequency-amplitude converter being smaller than the linear operating interval corresponding to the first frequency-amplitude converter, and the communication method further comprises obtaining third amplitude information of a fourth signal by using the second frequency-amplitude converter, and demodulating the filtered fourth signal based on the third amplitude information of the fourth signal.

[0061] Referring to the seventh aspect, in some implementations of the seventh aspect, the first frequency-amplitude converter includes a first phase shift unit, and the first phase shift unit is first frequency- amplitude Based on the curve, different phase shifts are introduced to signals of different frequencies. The second frequency-amplitude converter includes a second phase shift unit, and the second phase shift unit is second frequency- amplitude Based on the curve, different phase shifts are introduced to signals of different frequencies, and the second frequency - amplitude The slope of the curve is the first frequency - amplitude It is greater than the slope of the curve.

[0062] Referring to the seventh aspect, in some implementations of the seventh aspect, a differential frequency modulation scheme is used for the second signal, and demodulating the filtered fourth signal based on the third amplitude information of the fourth signal involves obtaining the frequency difference of the fourth signal transmitted in adjacent time units based on the third amplitude information of the fourth signal by the second branch, where the frequency of the fourth signal transmitted in the i-th time unit is f(i)=mod[f(i-1)+Δf1(i),B1], where Δf1(i) is the difference between the frequency of the i-th fourth signal and the frequency of the (i-1)-th fourth signal in the sequence of the fourth signal, where B1 is a pre-set first bandwidth value, and where i is an integer greater than 1, and obtaining the modulation information carried in the filtered fourth signal based on the frequency difference of the filtered fourth signal.

[0063] Referring to the seventh aspect, in some implementations of the seventh aspect, a differential frequency modulation scheme is used for the first signal, and the method is to obtain the frequency difference of a third signal transmitted in adjacent time units based on first amplitude information by a first branch, where the frequency of the third signal transmitted in the j-th time unit is f(j)=mod[f(j-1)+Δf1(j),B3], where Δf1(j) is the difference between the frequency of the j-th third signal and the frequency of the (j-1)-th third signal in the sequence of third signals, B3 is a pre-set third bandwidth value, and j is an integer greater than 1, and further comprises obtaining the modulation information carried by the third signal based on the frequency difference of the third signal.

[0064] For the technical effects of any possible implementation of the seventh aspect, please refer to the technical effects of the corresponding implementation of the third aspect. Further details are not provided here.

[0065] A communication method is provided according to the eighth aspect. The communication method is applied to a communication device, the communication device comprising a first branch and a second branch, the first branch comprising a first filter, the second branch comprising a second filter, the bandwidth of the second filter being narrower than the bandwidth of the first filter, the communication method comprising: receiving a second signal, the second signal instructing the communication device to enter a connected state; filtering a fifth signal by using a first filter, the fifth signal being a signal obtained by performing frequency mixing on the second signal and a first local oscillator signal, the first local oscillator signal being a local oscillator signal generated by the communication device; and filtering a sixth signal by using a second filter, the sixth signal being a signal obtained by performing frequency mixing on the second signal and a second local oscillator signal, the second local oscillator signal being a signal obtained by performing frequency offset correction on the first local oscillator signal based on second amplitude information of the fifth signal.

[0066] Referring to the eighth aspect, in some implementations of the eighth aspect, the first branch further includes a first frequency-amplitude converter, and prior to filtering the sixth signal by using a second filter, the communication method further includes obtaining second amplitude information by using the first frequency-amplitude converter, obtaining a second frequency offset value based on the second amplitude information, and obtaining a second local oscillator signal by performing frequency offset correction on the first local oscillator signal based on the second frequency offset value.

[0067] Referring to the eighth aspect, in some implementations of the eighth aspect, the second branch further includes a second frequency-amplitude converter, the linear operating interval corresponding to the second frequency-amplitude converter is smaller than the linear operating interval corresponding to the first frequency-amplitude converter, and the communication method further includes demodulating the filtered sixth signal.

[0068] Referring to the eighth aspect, in some implementations of the eighth aspect, the first frequency-amplitude converter includes a first phase shift unit, and the first phase shift unit is first frequency- amplitude Based on the curve, different phase shifts are introduced to signals of different frequencies. The second frequency-amplitude converter includes a second phase shift unit, and the second phase shift unit is second frequency- amplitude Based on the curve, different phase shifts are introduced to signals of different frequencies, and the second frequency - amplitude The slope of the curve is the first frequency - amplitude It is greater than the slope of the curve.

[0069] Referring to the eighth aspect, in some implementations of the eighth aspect, a differential frequency modulation scheme is used for the second signal, and demodulating the filtered sixth signal involves obtaining the frequency difference of the filtered sixth signal transmitted in adjacent time units, where the frequency of the filtered sixth signal transmitted in the i-th time unit is f(i)=mod[f(i-1)+Δf2(i),B2], where Δf2(i) is the difference between the frequency of the i-th sixth signal and the frequency of the (i-1)-th sixth signal in the sequence of filtered sixth signals, where B2 is a pre-set second bandwidth value, and where i is an integer greater than 1, and obtaining the modulation information carried in the filtered sixth signal based on the frequency difference of the filtered sixth signal.

[0070] For the technical effects of any possible implementation of Aspect 8, please refer to the technical effects of the corresponding implementation of Aspect 4. Further details are not provided here.

[0071] For example, in an implementation, the communication method in any of the fifth through eighth aspects may be performed by an access network device, or by a chip or circuit used in the access network device. In other possible implementations, the communication method in any of the fifth through eighth aspects may be performed by a terminal device, or by a chip or circuit used in the terminal device.

[0072] In accordance with the ninth aspect, the communication device includes one or more processors, one or more memories, and one or more computer programs. The one or more computer programs are stored in one or more memories. The one or more computer programs include instructions. When the instructions are executed by one or more processors, the communication device can perform a communication method in any possible implementation of the fifth through eighth aspects.

[0073] A computer program product including computer instructions is provided in accordance with the tenth aspect. When the computer program product is executed on a communication device, the communication device can perform a communication method in any possible implementation of the fifth through eighth aspects.

[0074] In accordance with the eleventh aspect, a computer-readable storage medium is provided. The storage medium may be non-volatile. The storage medium contains instructions. When the instructions are executed by the communication device, the communication device can perform a communication method in any possible implementation of the fifth through eighth aspects.

[0075] In accordance with the twelfth aspect, a chip is provided which includes at least one processor and an interface. The interface circuit is configured to supply program instructions or data to at least one processor. The at least one processor is configured to execute program instructions and implement a communication method in any possible implementation of the fifth through eighth aspects.

[0076] In accordance with the 13th aspect, a communication system is provided, including a transmitting device and a communication apparatus. The communication apparatus is configured to perform a communication method in any possible implementation of the 5th through 8th aspects. [Brief explanation of the drawing]

[0077] [Figure 1] This is a diagram showing the architecture of a communication system applicable to the embodiments of the present invention. [Figure 2] This is a curve diagram showing the relationship between the amplitude and time of the FSK signal. [Figure 3] This is a curve diagram showing the relationship between the amplitude and time of other FSK signals. [Figure 4] This is a diagram illustrating the structure of a non-coherent FSK receiver device. [Figure 5] This is a diagram of the structure of an FM-AM converter. [Figure 6] This is a diagram of the frequency-amplitude conversion curve of an FM-AM converter. [Figure 7] This is a diagram of the frequency-amplitude conversion curve of an FM-AM converter. [Figure 8] This is a diagram showing the structure of a communication device according to an embodiment of the present application. [Figure 9] This figure shows a first signal, first data, second signal, and second data transmitted by a transmitting device according to an embodiment of the present application. [Figure 10] This figure shows the frequency-amplitude conversion curve of an FM-AM converter according to an embodiment of the present application. [Figure 11] This is a diagram showing the structure of another communication device according to an embodiment of the present application. [Figure 12] This is a diagram showing the structure of yet another communication device according to an embodiment of the present application. [Figure 13] This is a diagram showing the structure of a communication device according to an embodiment of the present application. [Figure 14] This is a diagram showing the structure of a frequency-amplitude converter according to an embodiment of the present application. [Figure 15] This is a diagram showing the structure of an RLC resonator according to an embodiment of the present application. [Figure 16] This is a diagram showing the structure of a communication device according to an embodiment of the present application. [Figure 17] This is a diagram showing the structure of a communication device according to an embodiment of the present application. [Figure 18] This is a diagram showing the structure of a communication device according to an embodiment of the present application. [Figure 19] This is a diagram showing the structure of a communication device according to an embodiment of the present application. [Figure 20] This is a diagram showing the structure of a communication device according to an embodiment of the present application. [Figure 21] This is a diagram showing the structure of a communication device according to an embodiment of the present application. [Figure 22] This is a diagram showing the structure of a communication device according to an embodiment of the present invention. [Figure 23] This is a diagram showing the structure of a communication device according to an embodiment of the present application. [Figure 24] This is a diagram showing the structure of a communication device according to an embodiment of the present application. [Figure 25] This is a diagram showing the structure of a communication device according to an embodiment of the present application. [Figure 26] This is a diagram showing the structure of a communication device according to an embodiment of the present application. [Figure 27] This is a schematic flowchart of the communication method according to the embodiment of the present invention. [Figure 28] This is a schematic flowchart of the communication method according to the embodiment of the present invention. [Figure 29] This is a schematic flowchart of the communication method according to the embodiment of the present invention. [Figure 30] This is a schematic flowchart of the communication method according to the embodiment of the present invention. [Figure 31] This is a schematic flowchart of the communication method according to the embodiment of the present invention. [Figure 32] This is a schematic flowchart of the communication method according to the embodiment of the present invention. [Modes for carrying out the invention]

[0078] The following describes the technical solution of the embodiment of this application with reference to the attached drawings.

[0079] To facilitate understanding of the embodiments of this application, the following description is given first before the embodiments of this application are described.

[0080] Firstly, in embodiments of the present application, “indication” may include direct and indirect indications, or explicit and implicit indications. Information indicated by a particular signal (e.g., the first signal below) is referred to as indicated information. In a specific implementation process, indicated information may be indicated in several ways, including, but not limited to, directly indicating the indicated information, or indicating the indicated information or an index of the indicated information. Alternatively, indicated information may be indicated indirectly by indicating other information, where there is a correlation between the other information and the indicated information. Alternatively, only a portion of the indicated information may be indicated, with the remainder of the indicated information being known or pre-agreed upon. For example, particular information may be indicated by using a pre-agreed (e.g., specified in a protocol) arrangement sequence of all information, thereby reducing the indication overhead to some extent.

[0081] Secondly, the terms "first" and "second" and various numbers in the following embodiments are used merely for distinction to facilitate description and are not intended to limit the scope of the embodiments of the present application. For example, different signals and branches are distinguished.

[0082] Thirdly, “multiple” in the embodiments of this application means two or more.

[0083] The technical solutions of the embodiments of this application include global system for mobile communications (GSM), code division multiple access (CDMA) systems, wideband code division multiple access (WCDMA) systems, general packet radio service (GPRS), long-term evolution (LTE) systems, LTE frequency division duplex (FDD) systems, LTE time division duplex (TDD) systems, universal mobile telecommunications system (UMTS), and worldwide interoperability for microwave access (WiMAX) communication systems. , the It has the potential to be applied to various communication systems, such as 5th generation (5G) systems and new radio (NR) systems.

[0084] To facilitate understanding of the embodiments of this application, the communication systems applicable to the methods provided in the embodiments of this application will first be described in detail with reference to Figure 1. Figure 1 is a diagram of a communication system 100 applicable to the methods provided in the embodiments of this application.

[0085] In the example, as shown in Figure 1, the communication system 100 may include at least one access network device in the 5G system, e.g., a gNB (gNB), and a satellite site, as shown in Figure 1. The architecture of the communication system may further include at least one terminal device, e.g., user equipment (UE) 1 to UE9, as shown in Figure 1. The access network device may communicate with each terminal device via a radio link. For example, the access network device may transmit configuration information to a terminal device, and the terminal device may transmit uplink data to the access network device based on the configuration information. As another example, the access network device may transmit downlink data to a terminal device. Thus, the communication system may include the gNB and UE1 to UE6 in Figure 1, and other communication systems may include the satellite site and UE7 to UE9 in Figure 1. Furthermore, the base station and satellite site may be connected to the core network device in different ways, and the base station and satellite site may transmit data to or receive data from the core network device. This architecture may include multiple satellite sites or multiple base stations, and the satellite sites may also provide services to the UEs, similar to UE1-UE6. This is not limited to the present invention. Multiple antennas may be configured for each of the communication devices, e.g., base stations, satellite sites, or UE1-UE9. The multiple antennas may include at least one transmitting antenna configured to transmit signals and at least one receiving antenna configured to receive signals. Each communication device may further include a transmitter chain and a receiver chain. Those skilled in the art will understand that both the transmitter chain and the receiver chain may include multiple components (e.g., processors, modulators, multiplexers, demodulators, demultiplexers, or antennas) involved in transmitting and receiving signals. Thus, a base station may use multiplex antenna technology to UE1 It can communicate with UE6, and the satellite site can communicate with UE7-UE9 by using multiple antenna technology.

[0086] In other examples, terminal devices within the communication system 100, such as UE4 to UE6, may also form a communication system. For example, links between UE5 and UE4 and between UE5 and UE6 may be called sidelinks. For example, UE5 may control UE4 and UE6 to execute corresponding commands. This is not limited to the present invention.

[0087] Furthermore, it should be understood that Figure 1 is merely a schematic diagram used as an example for ease of understanding. The communication system 100 may further include other access network devices or terminal devices not shown in Figure 1.

[0088] It should be understood that access network devices within a wireless communication system may be any device equipped with wireless transceiver functionality. These devices include, but are not limited to, evolved node B (eNB or eNodeB), radio network controller (RNC), node B (NB), base station controller (BSC), base transceiver station (BTS), home base station (e.g., home evolved node B or home node B, HNB), baseband unit (BBU), access point (AP) in a wireless fidelity (Wi-Fi) system, wireless relay node, wireless backhaul node, transmission point (TP), transmission reception point (TRP), and others. Alternatively, the device may be a gNB or transmit point (TRP or TP) in a 5G system such as an NR system, one antenna panel or group of antenna panels (including multiple antenna panels) of a gNB in ​​a 5G system, or a network node such as a baseband unit (BBU) or distributed unit (DU) that constitutes a gNB or transmit point.

[0089] In some configurations, a gNB may include a central unit (CU) and a DU. A gNB may further include a radio unit (RU). The CU implements some of the functions of the gNB, and the DU implements some of the functions of the gNB. For example, the CU implements the functions of the radio resource control (RRC) layer and the packet data convergence protocol (PDCP) layer, while the DU implements the functions of the radio link control (RLC) layer, the media access control (MAC) layer, and the physical (PHY) layer. Information in the RRC layer ultimately becomes information in the PHY layer, or is converted from information in the PHY layer. Therefore, in the architecture, higher-level layer signaling, such as RRC layer signaling, can also be considered as being transmitted by the DU or by both the DU and the CU. It can be understood that an access network device may be a CU node, a DU and a CU node, or a device containing both CU and DU nodes. Furthermore, a CU may be classified as an access network device within an access network (RAN), or as an access network device within a core network (CN). This is not limited to the present invention.

[0090] Furthermore, it should be understood that terminal devices within a wireless communication system may also be called user equipment (UE), access terminal, subscriber unit, subscriber station, mobile station, remote station, remote terminal, mobile device, user terminal, terminal, wireless communication device, user agent, or user equipment. Terminal devices in embodiments of the present application may include mobile phones, tablet computers (pads), computers with wireless transmission and reception capabilities, virtual reality (VR) terminal devices, augmented reality (AR) terminal devices, wireless terminals in industrial control, wireless terminals in self-driving, wireless terminals in remote medical care, wireless terminals in smart grids, wireless terminals in transportation safety, wireless terminals in smart cities, wireless terminals in smart homes, and the like. Application scenarios are not limited to embodiments of the present application.

[0091] In embodiments of the present invention, a terminal device or access network device includes a hardware layer, an operating system layer running on the hardware layer, and an application layer running on the operating system layer. The hardware layer includes hardware such as a central processing unit (CPU), a memory management unit (MMU), and memory (also called main memory). The operating system may be any one or more computer operating systems that implement service processing through processes, such as the Linux® operating system, Unix® operating system, Android® operating system, iOS® operating system, or Windows® operating system. The application layer includes applications such as a browser, address book, word processing software, and instant messaging software. Furthermore, the specific structure of the implementer of the method provided in embodiments of the present invention is not particularly limited in embodiments of the present invention, provided that a program recording the code of the method provided in embodiments of the present invention can be executed to perform communication in accordance with the method provided in embodiments of the present invention. For example, the implementer of the method provided in embodiments of the present invention may be a terminal device, an access network device, or a functional module located within a terminal device or access network device that can call and execute a program.

[0092] Furthermore, aspects or features of the present application may be implemented as methods, apparatus, or products using standard programming and / or engineering techniques. As used in this application, the term “product” covers computer programs that can be accessed from any computer-readable component, carrier, or medium. For example, computer-readable media may include, but are not limited to, magnetic storage components (e.g., hard disks, floppy disks, or magnetic tapes), optical discs (e.g., compact discs (CDs) or digital versatile discs (DVDs)), smart cards, and flash memory components (e.g., erasable programmable read-only memory (EPROM), cards, sticks, or key drives). Also, the various storage media described herein may be one or more devices and / or other machine-readable media configured to store information. The term “machine-readable media” may include, but are not limited to, wireless channels and various other media that can store, contain, and / or carry instructions and / or data.

[0093] To facilitate understanding of the embodiments of this application, the relevant technical content in this application is briefly described first.

[0094] 1. Modulation technology is a technique that controls changes in the amplitude, phase, or frequency of a carrier wave based on the information that needs to be transmitted in order to perform information transmission using a carrier wave.

[0095] 2. FSK modulation is a modulation technique that modulates information using the carrier frequency.

[0096] 3. The modulation order is used to calculate the number of bits that can be represented by each symbol in the code pattern. When the modulation order is M, the number of bits that can be represented by each symbol is log2M, meaning that one symbol can carry log2M bits of information. In this case, an FSK with a modulation order of M may be called an M-FSK.

[0097] For example, if the modulation order is 2, one symbol can carry 1 bit of information. In this case, each symbol in the 01-bit sequence of information being transmitted can be considered to carry 1 bit. An FSK signal at transmission frequency f1 can represent the transmission of "0", and an FSK signal at transmission frequency f2 can represent the transmission of "1". The carrier frequency of the FSK signal is f c This is the average value of f1 and f2. For example, Figure 2 is a curve diagram showing the relationship between amplitude and time for an FSK signal with a modulation order of 2.

[0098] As another example, when the modulation order is 4, one symbol can carry 2 bits of information. In this case, each symbol in the 01-bit sequence of information being transmitted can be thought of as carrying 2 bits. An FSK signal at transmission frequency f1 can represent that "00" is transmitted, an FSK signal at transmission frequency f2 can represent that "01" is transmitted, an FSK signal at transmission frequency f3 can represent that "10" is transmitted, and an FSK signal at transmission frequency f4 can represent that "11" is transmitted. FSK signal carrier frequency f c This is the average value of f1, f2, f3, and f4. For example, Figure 3 is a curve diagram showing the relationship between amplitude and time for an FSK signal with a modulation order of 4.

[0099] Please note that Figures 2 and 3 are merely two examples of FSK signals and should not constitute a limitation on this application.

[0100] 4. Demodulation is the reverse process of modulation. Generally, a receiving device obtains information transmitted by a transmitting device from a modulated signal (a signal modulated by a transmitting device) using a signal processing method.

[0101] 5. FSK receiving devices can be classified into two basic modes: coherent FSK receiving devices and non-coherent FSK receiving devices. Coherent FSK receiving devices need to recover the carrier wave. In other words, coherent FSK receiving devices need to recover the carrier wave and demodulate the FSK signal by using the recovered carrier wave to obtain demodulated information. However, non-coherent FSK receiving devices do not have such requirements; that is, non-coherent FSK receiving devices do not need to recover the carrier wave and perform demodulation directly based on the received FSK signal to obtain demodulated information.

[0102] Generally, coherent FSK receivers offer better demodulation performance but consume more power. Non-coherent FSK receivers do not offer the same level of demodulation performance as coherent FSK receivers, but have the advantages of a simpler structure and lower power consumption. In many communication systems, non-coherent FSK receivers are typically chosen due to the extremely high demand for low power consumption.

[0103] It should be noted that the receiving device in the embodiment of this application is a non-coherent FSK receiving device.

[0104] The following example uses the non-coherent FSK receiver shown in Figure 4 to describe the circuitry of a non-coherent FSK receiver.

[0105] For example, as shown in Figure 4, a non-coherent FSK receiving device includes a radio frequency band-pass filter (RF BPF), a radio frequency low noise amplifier (RF LNA), a local oscillator (LO) (also called a local oscillator), a multiplier, an intermediate noise amplifier (IF LNA), a BPF, a frequency modulation (FM)-amplitude modulation (AM) converter, a low-pass filter (LPF), and an envelope or amplitude detection module.

[0106] The process by which a non-coherent FSK receiving device receives an FSK signal (e.g., 1 GHz) is roughly as follows: After the FSK signal is received by the antenna of the non-coherent FSK receiving device, the FSK signal is first filtered using an RF bandpass filter (BPF). Signal amplification is performed on the filtered FSK signal using an RF line amplifier (LNA), and then frequency mixing is performed by using a multiplier on the FSK signal and the local oscillator signal output by the LO. The frequency-mixed FSK signal is down-converted to an intermediate frequency (e.g., 50 MHz) and then filtered again using a BPF. The frequency information of the filtered signal is converted into amplitude information using an FM-AM converter, and noise is removed using an LPF. In this case, an envelope or amplitude detection module may be used to detect modulation information based on the amplitude information.

[0107] In one respect, in the non-coherent FSK receiving device shown in Figure 4, the FM-AM converter can convert signals of different frequencies into signals with different amplitudes.

[0108] The following description of the FM-AM converter will be based on the internal structure of the FM-AM converter shown in Figure 5 as an example. It should be noted that Figure 5 is merely one example of the internal structure of an FM-AM converter and should not constitute a limitation of this application.

[0109] For example, as shown in Figure 5, an FM-AM converter includes a phase shift module and a multiplier. The phase shift module can perform different phase rotations for signals of different frequencies. The signal S(t) input to the FM-AM converter is split into two channels. One channel of the signal goes directly into the multiplier. The other channel of the signal first goes into the phase shift module. After the signal S(t) passes through the phase shift module, a signal Sp(t) is obtained. Then, the signal Sp(t) goes into the multiplier for frequency mixing with the signal S(t), and the frequency-mixed signal S(t)Sp(t) is obtained.

[0110] The phase φ of the signal S(t) rotated by the phase shift module. rot (f) satisfies the following equation:

number

[0111] fc is the carrier frequency, and f FSK (t) is the frequency corresponding to the signal S(t).

[0112] Thus, the equation relating the amplitude and time of the signal Sp(t) is as follows:

number

[0113] The relationship between the amplitude and time of the signal obtained by removing the high-frequency components of the signal S(t)Sp(t) is as follows:

number

[0114] 2πK(f FSK If (t)-fc) is small,

number

[0115] Regardless of the content structure of the FM-AM converter, the internal structure of the FM-AM converter has a linear operating interval. Generally, based on the frequency range of the signal received by the receiving device, the frequency-amplitude conversion curve of the FM-AM converter is set to be linear within the frequency range of the intermediate frequency signal.

[0116] Figures 6 and 7 are diagrams of the frequency-amplitude conversion curves of an FM-AM converter, respectively. For example, as shown in Figures 6 and 7, under ideal conditions, the frequency-amplitude conversion curves of an FM-AM converter have a linear relationship, as shown by the solid lines in Figures 6 and 7. Under actual conditions, the frequency-amplitude conversion curves of an FM-AM converter can only be approximately linear within a specific frequency interval, as shown by the dashed lines in Figures 6 and 7, and the frequency-amplitude conversion curves of an FM-AM converter have an interval [f 11 ,f 12 A linear relationship can only be approximately observed within the given range.

[0117] For simplicity, the specific frequency interval over which the frequency-amplitude conversion curve of an FM-AM converter is approximately linear is called the linear operating interval of the FM-AM converter.

[0118] The frequencies of the signals obtained by performing frequency mixing on the received signal and the local oscillator signal generated by LO are f1, f2, f3, and f4, where f1, f2, f3, and f4 are all intervals [f11 , f 12 When entering [], the amplitudes obtained through the conversion by the FM-AM converter are e1, e2, e3, and e4 respectively. As shown in FIG. 6, when the frequency difference between any two adjacent frequencies among f1, f2, f3, and f4 is the same, the amplitude difference between any two adjacent amplitudes among e1, e2, e3, and e4 is also the same.

[0119] However, due to reasons of the LO (for example, the stability of the LO), the performance of the LO may be unstable, or the performance of the LO is likely to be affected by the surrounding environment such as temperature. Therefore, there is usually an offset between the frequency of the local oscillator signal generated by the LO and the ideal frequency. In this case, there is an offset Δf between the frequency of the signal obtained by performing frequency mixing on the received signal and the local oscillator signal generated by the LO and the ideal frequency. When the offset Δf is large, the frequency of the signal obtained by performing frequency mixing on the received signal and the local oscillator signal generated by the LO exceeds the linear operating interval of the FM-AM converter, and the amplitudes obtained through the conversion may no longer have a linear relationship.

[0120] For example, when the frequencies of the signals obtained by performing frequency mixing on the received signal and the local oscillator signal generated by the LO are f1, f2, f3, and f4, however, because the local oscillator signal generated by the LO has an offset Δf, the frequencies of the signals obtained by performing frequency mixing on the received signal and the local oscillator signal generated by the LO are changed to f1 + Δf, f2 + Δf, f3 + Δf, and f4 + Δf. For example, as shown in FIG. 7, f1 + Δf and f2 + Δf are within the interval [f 11 , f 12 , and f3 + Δf and f4 + Δf are within the interval [f 11 , f 12It exceeds ]. In this case, even if the intervals of every two in f1+Δf, f2+Δf, f3+Δf and f4+Δf are the same, the intervals of every two in e1', e2', e3' and e4' are different.

[0121] In this case, the baseband signal obtained by demodulating the received signal by the receiving device contains errors. As a result, the demodulation performance of the receiving device is severely affected.

[0122] Accordingly, embodiments of the present invention provide a communication device. The communication device can perform frequency offset correction on the local oscillator signal generated by the communication device. In this way, the error in the baseband signal obtained by demodulating the received signal by the communication device can be reduced, and the demodulation performance of the receiving device is improved.

[0123] The type of communication device in this embodiment is not limited in this application. For example, the communication device may be any device shown in Figure 1, or the communication device may be a device within any device shown in Figure 1.

[0124] For example, a communication device includes two branches. One branch performs frequency offset correction on the local oscillator signal, and the other branch demodulates the received signal based on the local oscillator signal obtained by the correction.

[0125] The two branches can operate in a time-sharing manner or simultaneously. For simplicity, the operation of the two branches in a time-sharing manner is represented as Example 1, and the operation of the two branches simultaneously is represented as Example 2.

[0126] In one example, two branches may operate in a time-division multiplexing manner using switches. Specifically, at least one switch is provided for each branch. When one of the two branches needs to operate, the switch for that branch may be turned on, thereby connecting that branch to other modules of the communication device. When the other of the two branches needs to operate, the switch for one branch may be turned off, and the switch for the other branch may be turned on, thereby disconnecting one branch from other modules of the communication device and connecting the other branch to other modules of the communication device.

[0127] The following describes the communication device in detail, using Examples 1 and 2 as examples. [Examples]

[0128] Figure 8 is a diagram showing the structure of a communication device according to an embodiment of the present application.

[0129] The communication device 800 shown in Figure 8 is configured to receive a first signal and a second signal, both of which originate from the same device (which may be called a transmitting device), and the second signal instructs the communication device to enter a connected state.

[0130] The first signal is used to perform frequency offset correction on the local oscillator signal (the first local oscillator signal described below) generated by the communication device 800.

[0131] In one example, the first signal does not need to carry content.

[0132] In other examples, the first signal may alternatively carry content.

[0133] For example, the first signal may carry a cell identifier. A cell is an area serviced by a transmitting device, and the cell identifier is used to help a receiving device determine whether the information is being received from the correct transmitting device.

[0134] Note that if the receiving device is within the coverage of the transmitting device, the transmitting device may be understood as the correct transmitting device as described above. Alternatively, if the receiving device has established a connection to the transmitting device, the transmitting device may also be understood as the correct transmitting device as described above.

[0135] Whether the first signal carries content is not limited in this embodiment of the Application. Furthermore, the name of the first signal is not limited in this embodiment of the Application. For example, the first signal may be called another signal, such as a reference signal, and any signal having the same function as the first signal may be considered the first signal.

[0136] Furthermore, the name of the second signal is not limited to this embodiment of the present application. For example, the second signal may be called another signal, such as a wake-up signal, and any signal having the same function as the second signal may be considered the second signal.

[0137] The method for transmitting the first signal and the second signal is not limited in this embodiment of the present application.

[0138] In one example, the transmitting device may periodically transmit a first signal and a second signal. Correspondingly, the communication device 800 may periodically receive the first signal and the second signal transmitted by the transmitting device.

[0139] For example, the period during which the transmitting device transmits the first signal and / or the second signal may be notified to the communication device 800 by the transmitting device, or the period during which the transmitting device transmits the first signal and / or the second signal may be specified or set in advance. This is not limited to this embodiment of the present application.

[0140] The values ​​of the transmission periods for the first and second signals are not limited in this embodiment of the present application. The values ​​may be determined based on actual circumstances.

[0141] Optionally, in this example, as shown in Figure 9, the transmitting device may first transmit the first signal and then the second signal at a period T.

[0142] It should be noted that Figure 9 is illustrated using an example in which the transmitting device transmits the second signal immediately after completing the transmission of the first signal. This should not constitute a limitation to the present invention. For example, the transmitting device may alternatively transmit the second signal before the transmission of the first signal is completed. Alternatively, the transmitting device may transmit the second signal after a certain period of time has passed since the transmission of the first signal was completed.

[0143] Optionally, in this example, the transmitting device may further transmit the first and second data to the communication device 800. Accordingly, the communication device is further configured to receive the first and second data.

[0144] The method for transmitting the first data and the second data is not limited in this embodiment of the present application.

[0145] For example, the transmission method by which the transmitting device transmits the first data and / or the second data may be notified to the communication device 800 by the transmitting device, or the transmission method by which the transmitting device transmits the first data and / or the second data may be specified or set in advance. This is not limited to this embodiment of the present application.

[0146] For example, a transmitting device transmits a first signal and first data using frequency division multiplexing (FDM).

[0147] For example, the transmitting device may transmit the second signal and the second data using the FDM method.

[0148] Furthermore, when the transmitting device transmits the first signal and first data using the FDM method, and transmits the second signal and second data using the FDM method, as shown in Figure 9, the frequency guard interval Δf1 between the first signal and the first data is greater than the frequency guard interval Δf2 between the second signal and the second data.

[0149] For example, the frequency guard interval Δf1 between the first signal and the first data and / or the frequency guard interval Δf2 between the second signal and the second data may be notified to the communication device 800 by the transmitting device, or the frequency guard interval Δf1 between the first signal and the first data and / or the frequency guard interval Δf2 between the second signal and the second data may be specified or set in advance. This is not limited to this embodiment of the present application.

[0150] The first signal is used to perform frequency offset correction on the first local oscillator signal, and the second signal instructs the communication device to enter the connected state. Thus, the communication device 800 first performs frequency offset correction on the first local oscillator signal based on the first signal, and then demodulates the received second signal based on the second local oscillator signal obtained by performing frequency offset correction on the first local oscillator signal. Because a frequency offset exists during the process in which the communication device 800 performs frequency offset correction on the first local oscillator signal, the frequency guard interval between the first signal and the first data is set to be larger (with respect to the frequency guard interval between the second signal and the second data) so that the first data, which is normally transmitted in an adjacent frequency band, cannot enter the first branch described below. In the process of demodulating the received second signal based on the second local oscillator signal obtained by performing frequency offset correction on the first local oscillator signal, the frequency offset value of the obtained second local oscillator signal is smaller than the frequency offset value of the first local oscillator signal because the frequency offset correction is performed on the first local oscillator signal. Therefore, the frequency guard interval between the second signal and the second data is set to be smaller (relative to the frequency guard interval between the first signal and the first data) so that the second data, which is normally transmitted in an adjacent frequency band, cannot enter the second branch described below. Also, a smaller guard interval helps to improve the utilization of system resources.

[0151] In one example, to reduce the power consumption of a communication device, two links are typically placed in the communication device. One link works normally. Receiving and transmitting dataOne link is used for this purpose. When the link is enabled, the power consumption of the communication device is high. The other link is used when the communication device is disconnected. When the other link is enabled, the power consumption of the communication device is low. In other words, in order to reduce the power consumption of the communication device 800, the communication device 800 may receive signals (e.g., a first signal and a second signal) and data (e.g., first data and second data) through the two links, respectively.

[0152] Specifically, when the communication device 800 is in a disconnected state, the first link of the communication device 800 is operational. In this case, the second link of the communication device 800 is unavailable. If the communication device 800 needs to enter a connected state, it must first enable the second link. For example, when the communication device 800 is in a disconnected state, it receives the first and second signals via the first link. After the communication device 800 receives instruction information in the second signal, which instructs it to enter a connected state or to receive data, the communication device 800 triggers itself to enable the second link. Furthermore, after exchanging information with the transmitting device, the communication device 800 enters a connected state and then receives the first and second data via the second link.

[0153] For example, the first link mentioned above may also be called a wake-up radio (WUR), and the second link may also be called a main radio. This is not limited to the present invention.

[0154] Alternatively, the communication device 800 may receive signals (e.g., a first signal and a second signal) and data (e.g., first data and second data) over a single link. This is not limited to the present invention.

[0155] Optionally, in one example, if the first signal carries content, the transmitting device may transmit the first signal with a higher transmission power (compared to the transmission power of the second signal) so that the communication device 800 can have better demodulation performance for the first signal, thereby enabling the communication device 800 to acquire the first signal with strong signal strength and to acquire modulation information of the first signal based on the first signal.

[0156] Optionally, in one example, if the first signal carries content, the transmitting device may transmit the first signal at a lower modulation order (with respect to the modulation order of the second signal), the lowest modulation order (e.g., a modulation order of 2), or at a single frequency, so that the communication device 800 can have better demodulation performance for the first signal. A lower modulation order means less information is carried in each symbol of the first signal, and less amplitude is converted from frequency by the communication device 800. In this way, with the same interval, fewer amplitudes mean greater distance between amplitudes. Therefore, the communication device 800 has better demodulation performance for the first signal.

[0157] For example, as shown in Figure 8, the communication device 800 includes a first branch 810 and a second branch 820.

[0158] The first branch 810 includes a first frequency-amplitude converter 811. The first frequency-amplitude converter 811 is configured to acquire first amplitude information of a third signal, which is a signal obtained by performing frequency mixing on the first signal and the first local oscillator signal. In other words, the third signal obtained by performing frequency mixing on the first signal and the first local oscillator signal is input to the first frequency-amplitude converter 811, and the first frequency-amplitude converter 811 can acquire first amplitude information of the third signal.

[0159] The second branch 820 is configured to demodulate the fourth signal, which is a signal obtained by performing frequency mixing on the second signal and the second local oscillator signal, and the second local oscillator signal is a signal obtained by performing frequency offset correction on the first local oscillator signal based on the first amplitude information. In other words, based on the first amplitude information obtained by the first frequency-amplitude converter 811, the second local oscillator signal can be obtained by performing frequency offset correction on the first local oscillator signal, and the fourth signal obtained by performing frequency mixing on the second signal and the second local oscillator signal is input to the second branch 820, and the fourth signal can be demodulated by the second branch 820.

[0160] Furthermore, the second branch 820 includes a second frequency-amplitude converter 821, and the linear operating interval corresponding to the second frequency-amplitude converter 821 is smaller than the linear operating interval corresponding to the first frequency-amplitude converter 811.

[0161] As described above, the communication device 800 first obtains the first amplitude information of the third signal obtained by performing frequency mixing on the first signal and the first local oscillator signal by using the first frequency-amplitude converter 811 on the first branch 810. Then, the communication device 800 uses the second branch 820As a result, a fourth signal obtained by performing frequency mixing on the second local oscillator signal and the second signal is demodulated, and the second local oscillator signal is a signal obtained by performing frequency offset correction on the first local oscillator signal based on the first amplitude information. Since the first local oscillator signal has a frequency offset, the linear operating interval corresponding to the first frequency-amplitude converter 811 on the first branch 810 is set to be greater than the linear operating interval corresponding to the second frequency-amplitude converter 821, so that the frequency of the third signal obtained by performing frequency mixing on the first signal and the first local oscillator signal does not exceed the linear operating interval corresponding to the first frequency-amplitude converter 811. Therefore, the first frequency-amplitude converter 811 can accurately obtain the first amplitude information of the third signal and then perform accurate frequency offset correction on the first local oscillator signal based on the first amplitude information.

[0162] Furthermore, the communication device 800 demodulates the fourth signal obtained by performing frequency mixing on the second local oscillator signal and the second signal using the second branch 820. Since the second local oscillator signal is obtained by performing frequency offset correction on the first local oscillator signal, the frequency offset value of the fourth signal is smaller than the frequency offset value of the signal obtained by performing frequency mixing on the first local oscillator signal and the second signal. In this way, the fourth signal can still be accurately demodulated when the linear operating interval corresponding to the second frequency-amplitude converter 821 on the second branch 820 is set to be smaller than the linear operating interval of the first frequency-amplitude converter 811. Therefore, there is no serious impact on the demodulation performance of the communication device 800.

[0163] Optionally, in one example, if the internal structure of both the first frequency-amplitude converter 811 and the second frequency-amplitude converter 821 are the internal structure of the FM-AM converter shown in Figure 5, then the linear operating interval corresponding to the first frequency-amplitude converter 811 and the linear operating interval corresponding to the second frequency-amplitude converter 821 can be set based on the slope of the frequency-amplitude conversion curve of the phase shift module of the FM-AM converter.

[0164] For example, as shown in Figure 10, the ideal conversion curve 1 is the ideal conversion curve corresponding to the first frequency-amplitude curve, and the actual conversion curve 1 is the actual conversion curve corresponding to the first frequency-amplitude curve. The ideal conversion curve 2 is the second frequency- amplitude This is the ideal transformation curve corresponding to the curve, and the actual transformation curve 2 is the second frequency - amplitude This is the actual transformation curve corresponding to the curve. It can be seen that the slope of the actual transformation curve 2 is greater than the slope of the actual transformation curve 1, but the ideal operating interval corresponding to the actual transformation curve 2 is smaller than the operating interval of the actual transformation curve 1. Therefore, the linear operating interval corresponding to the frequency-amplitude converter can be set based on the slope of the frequency-amplitude transformation curve.

[0165] Specifically, the first frequency-amplitude converter 811 includes a first phase shift unit, and the first phase shift unit is first frequency- amplitude Based on the curve, different phase shifts are introduced to signals of different frequencies. The second frequency-amplitude converter 821 includes a second phase shift unit, which introduces different phase shifts to signals of different frequencies based on a second frequency-amplitude curve, and the slope of the second frequency-amplitude curve is the same as that of the first frequency- amplitude It is greater than the slope of the curve.

[0166] For example, in an ideal case, the frequencies of the signals obtained by performing frequency mixing on the first local oscillator signal and the first signal are f1, f2, f3, and f4. However, in a real case, if the first local oscillator signal has a frequency offset and the frequency offset is Δf, then the frequencies of the signals obtained by performing frequency mixing on the first local oscillator signal and the first signal are changed to f1+Δf, f2+Δf, f3+Δf, and f4+Δf. As shown in Figure 10, f1+Δf, f2+Δf, f3+Δf, and f4+Δf are all linear intervals [f 21 ,f 22 It is located within ]. In this case, the frequency interval between any two adjacent frequencies among f1+Δf, f2+Δf, f3+Δf, and f4+Δf is the same, and the interval between any two adjacent amplitudes among the amplitudes e1”, e2”, e3”, and e4”, obtained based on the actual conversion curve 2 is also the same. Compared to the ideal amplitude shown in Figure 6, the amplitude actually obtained in Figure 10 has an overall offset because a frequency offset exists. However, since the amplitude is still within the linear operating interval corresponding to the first frequency-amplitude converter 811, frequency offset correction can also be accurately performed on the first local oscillator signal thereafter based on the slope of the actual conversion curve 1 and the offset values ​​of e1”, e2”, e3”, and e4”.

[0167] Furthermore, since the slope of the actual conversion curve 2 is greater than the slope of the actual conversion curve 1, the Euclidean distance between amplitudes converted based on the actual conversion curve 2 is greater than the Euclidean distance between amplitudes converted based on the actual conversion curve 1. Also, for the same interval, the shorter the Euclidean distance, the worse the noise immunity of the demodulation. Therefore, in the process of demodulating the fourth signal based on the actual conversion curve 2, the Euclidean distance between amplitudes is long, so high demodulation performance can be obtained.

[0168] Optionally, in one example, as shown in Figure 11, the communication device 800 further includes a frequency offset estimation module 812 and a local oscillator 830. A first frequency-amplitude converter 811 is further configured to transmit first amplitude information to the frequency offset estimation module 812. The frequency offset estimation module 812 is configured to acquire a first frequency offset value based on the first amplitude information and to transmit the first frequency offset value to the local oscillator 830. The local oscillator 830 is configured to perform frequency offset correction on the first local oscillator signal based on the first frequency offset value and to acquire a second local oscillator signal.

[0169] In one example, the frequency offset estimation module 812 may obtain a first frequency offset value based on first amplitude information and first ideal amplitude information.

[0170] The first ideal amplitude information can be understood as the amplitude information corresponding to a third signal obtained by performing frequency mixing on the first signal and the first local oscillator signal, when the first local oscillator signal does not have a frequency offset.

[0171] It should be noted that the first ideal amplitude information may be transmitted to the communication device 800 by the transmitting device. Alternatively, the first ideal amplitude information may be calculated by the receiving device based on the transmission frequency of the first signal and the slope of the first frequency-amplitude conversion curve.

[0172] Optionally, in one example, configuring the second branch 820 to demodulate the fourth signal includes obtaining third amplitude information of the fourth signal by using the second frequency-amplitude converter 821 on the second branch 820, and obtaining modulation information of the fourth signal based on the third amplitude information.

[0173] How the second branch 820 acquires modulation information of the fourth signal based on the third amplitude information is not limited in this embodiment of the present application.

[0174] In one example, if the transmitting device performs frequency-shift keying modulation on the second signal, the second branch 820 obtains the modulation information carried by the fourth signal based on the third amplitude information of the fourth signal.

[0175] In another example, if the transmitting device performs differential frequency modulation on the second signal, i.e., if a differential frequency modulation scheme is used for the second signal, the second branch 820 first obtains the frequency difference of the fourth signal transmitted in adjacent time units based on the third amplitude information of the fourth signal, where the frequency of the fourth signal transmitted in the i-th time unit is f(i)=mod[f(i-1)+Δf1(i),B1], where Δf1(i) is the difference between the frequency of the i-th fourth signal and the frequency of the (i-1)-th fourth signal in the sequence of the fourth signal, B1 is a pre-set first bandwidth value, and i is an integer greater than 1, and then obtains the modulation information carried by the fourth signal based on the frequency difference of the fourth signal.

[0176] Furthermore, when i is 2, f(i- 1 Note that f(1) can be any value. The specific value of f(1) is not limited in this embodiment of the present application.

[0177] Furthermore, the time units described in all embodiments of this application may be understood as the period of an element in a bit sequence. The values ​​of the time units are not limited in this application. For example, the time units may be symbols.

[0178] Since the time interval between consecutive time units is extremely short, even if there is a residual frequency offset in the local oscillator signal generated by the communication device, the residual frequency offset of the local oscillator signals generated by the communication device in two consecutive time units can be considered to be the same. In this way, the residual frequency offset of the local oscillator signal generated by the communication device can be canceled out by subtracting the frequencies of the fourth signal in the two consecutive time units (i.e., differential frequency modulation). Therefore, the demodulation performance of the communication device is not further affected.

[0179] For example, if the transmitting device performs differential frequency modulation on the second signal based on a modulation order of 4, then every two bits in the 0 / 1 bit sequence of the transmitted second signal may be mapped to one symbol, with four possibilities for every two bits, namely "00", "01", "10", and "11". The transmitting device may map every two bits in the bit sequence of the second signal to one first frequency difference and modulate the second signal based on the first frequency difference mapped to every two bits in the bit sequence.

[0180] Table 1 shows the mapping relationship between every two bits in a bit sequence and the first frequency difference, according to the embodiments of the present invention.

[0181] Note that Table 1 is merely an example and should not constitute a limitation on this application. The value of the first frequency difference mapped to every two bits in the bit sequence is not limited in this embodiment of the application. [Table 1]

[0182] For example, the following assumptions are made: (1) The bit sequence of the second signal transmitted by the transmitting device is "01100011". (2) When i is 2, f(i-1) = f(1) = 20 kHz. In this case, f(1) can be called the initial frequency of the second signal. (3) B1 = 200 kHz. (4) The mapping relationship between every two bits in the bit sequence and the first frequency difference is the mapping relationship shown in Table 1. In this case, the transmitting device needs to modulate the second signal based on the bit sequence of the second signal. The specific process is as follows:

[0183] S1: After the transmitting device modulates the second signal, which is transmitted with symbols corresponding to the first bit ("0") and the second bit ("1") in the bit sequence of the second signal, the acquired frequency is 20kHz (initial frequency) + 50kHz (first frequency difference to which the first bit ("0") and the second bit ("1") are mapped) = 70kHz.

[0184] S2: After the transmitting device modulates the second signal, which is transmitted with symbols corresponding to the third bit ("1") and fourth bit ("0") in the bit sequence of the second signal, the acquired frequency is 70kHz (frequency acquired by modulating the second signal, which is transmitted with symbols corresponding to the first bit ("0") and second bit ("1")) + 100kHz (first frequency difference to which the third bit ("1") and fourth bit ("0") are mapped) = 170kHz.

[0185] S3: After the transmitting device modulates the second signal, which is transmitted with symbols corresponding to the 5th bit ("0") and the 6th bit ("0") in the bit sequence of the second signal, the acquired frequency is 170kHz (frequency acquired by modulating the second signal, which is transmitted with symbols corresponding to the 3rd bit ("1") and the 4th bit ("0")) + 0kHz (first frequency difference to which the 5th bit ("0") and the 6th bit ("0") are mapped) = 170kHz.

[0186] S4: After the transmitting device modulates the second signal, which is transmitted with symbols corresponding to the 7th bit ("1") and 8th bit ("1") in the bit sequence of the second signal, the acquired frequency is 170 kHz (5th bit ("0") and 6th bit ("0"). The second signal transmitted with the corresponding symbolThe frequency obtained by modulating the second signal is (Fr(i)) + 150kHz (the first frequency difference to which the 7th bit ("1") and the 8th bit ("1") are mapped) = 320kHz. However, since 320kHz exceeds the pre-set bandwidth value B1, the frequency obtained by modulating the second signal transmitted with symbols corresponding to the 7th bit ("1") and the 8th bit ("1") in the bit sequence of the second signal needs to be adjusted based on f(i) = mod[f(i-1) + Δf1(i), B1]. Finally, the frequency obtained by modulating the second signal transmitted with symbols corresponding to the 7th bit ("1") and the 8th bit ("1") in the bit sequence of the second signal is mod[320, 200] = 120kHz.

[0187] The frequencies obtained by modulating the bit sequence of the second signal transmitted by the transmitting device in this manner are shown in Table 2. [Table 2]

[0188] The bit sequence of the second signal transmitted by the transmitting device may be information bits transmitted by the transmitting device to the communication device 800, or the bit sequence of the second signal transmitted by the transmitting device may be specified or set in advance. This is not limited to the present invention.

[0189] Accordingly, the process by which the communication device 800 demodulates the fourth signal (a signal obtained by performing frequency mixing on the second signal and the second local oscillator signal) includes the following steps:

[0190] S1': Based on the third amplitude information of the fourth signal, it is obtained that the frequencies corresponding to the four symbols of the fourth signal are 70kHz, 170kHz, 170kHz, and 120kHz, respectively. The four symbols include the symbol corresponding to the first bit ("0") and the second bit ("1"), the symbol corresponding to the third bit ("1") and the fourth bit ("0"), the symbol corresponding to the fifth bit ("0") and the sixth bit ("0"), and the symbol corresponding to the seventh bit ("1") and the eighth bit ("1").

[0191] S2': Obtain the frequency difference of the fourth signal transmitted in adjacent time units. Specifically, obtain the frequency difference of the second signal transmitted in two adjacent symbols within the bit sequence of the fourth signal, and obtain modulation information based on the mapping relationship between every two bits in the bit sequence of the second signal and the first frequency difference. Since the transmitting device modulates the second signal based on Table 1, the mapping relationship between every two bits in the bit sequence of the second signal and the first frequency difference is queried based on Table 1.

[0192] Specifically, the difference between the frequency of the fourth signal transmitted by the first symbol of the fourth signal and the initial frequency of the second signal is 70kHz - 20kHz = 50kHz. Table 1 shows that a frequency difference of 50kHz corresponds to bit "01".

[0193] The difference between the frequency of the fourth signal transmitted in the second symbol of the fourth signal and the frequency of the fourth signal transmitted in the first symbol of the fourth signal is 170kHz - 70kHz = 100 It is kHz. Frequency difference 100 kHz is bit “ 10 Table 1 shows that this corresponds to ".

[0194] The difference between the frequency of the fourth signal transmitted by the third symbol of the fourth signal and the frequency of the fourth signal transmitted by the second symbol of the fourth signal is 170kHz - 170kHz = 0kHz. Table 1 shows that a frequency difference of 0kHz corresponds to bit "00".

[0195] Since the frequency of the fourth signal transmitted in the fourth symbol of the fourth signal is lower than the frequency of the fourth signal transmitted in the third symbol of the fourth signal's bit sequence, the transmitting device adjusts the frequency of the fourth signal during the modulation process of the fourth signal transmitted in the fourth symbol of the fourth signal. Therefore, the communication device 800 needs to recover the frequency based on f(i) = mod[f(i-1) + Δf1(i), B1]. Specifically, the frequency difference between the frequency of the fourth signal transmitted in the fourth symbol of the fourth signal's bit sequence and the frequency of the fourth signal transmitted in the third symbol of the fourth signal's bit sequence is 120kHz + 200kHz - 170kHz = 150kHz. From Table 1, it can be seen that the frequency difference of 150kHz corresponds to element "11".

[0196] In this way, the bit sequence of the fourth signal acquired by the communication device 800 is "01", "10", "00", and "11", so as to complete the demodulation of the fourth signal.

[0197] Optionally, in one example, as shown in Figure 12, the second branch 820 further includes an envelope or amplitude detection module 822 configured to acquire modulation information of a fourth signal based on third amplitude information.

[0198] Optionally, in one example, if the first signal carries content, the first branch 810 is further configured to demodulate the third signal. Specifically, the modulation information of the third signal is obtained based on the first amplitude information of the third signal.

[0199] How the first branch 810 acquires modulation information of the third signal based on the first amplitude information is not limited in this embodiment of the present application.

[0200] In one example, if the transmitting device performs frequency-shift keying modulation on the first signal, the first branch 810 obtains the modulation information carried by the third signal based on the first amplitude information of the third signal.

[0201] In another example, if the transmitting device performs differential frequency modulation on the first signal, i.e., if a differential frequency modulation scheme is used for the first signal, the first branch 810 first obtains the frequency difference of the third signal transmitted in adjacent time units based on the first amplitude information of the third signal, where the frequency of the third signal transmitted in the j-th time unit is f(j)=mod[f(j-1)+Δf1(i),B3], where Δf1(i) is the difference between the frequency of the j-th third signal and the frequency of the (j-1)-th third signal in the sequence of the third signal, B3 is a pre-set third bandwidth value, and j is an integer greater than 1, and then obtains the modulation information carried by the third signal based on the frequency difference of the third signal.

[0202] Note that when j is 2, f(j-1) = f(1) can be any value. The specific value of f(1) is not limited in this embodiment of the present application.

[0203] Optionally, in one example, as shown in Figure 11, the first branch 810 further includes an envelope or amplitude detection module 822 configured to acquire modulation information of a third signal based on first amplitude information. [Examples]

[0204] In Example 1, it can be seen from the above description of Example 1 that the communication device 800 performs frequency offset correction on the first local oscillator signal based on the first signal using the first branch 810. Next, the communication device 800 demodulates the received signal based on the second signal using the second branch 820. In other words, the transmitting device needs to transmit two signals (the first signal and the second signal), and the communication device 800 performs frequency offset correction on the first local oscillator signal and demodulates the received signal in a time-division multiplexer based on the two received signals that pass through the two branches (the first branch 810 and the second branch 820).

[0205] Furthermore, to reduce the signaling overhead of the transmitting device, the transmitting device may alternatively transmit only one signal (the second signal). In this way, the communication device 800 performs frequency offset correction on the first local oscillator signal and simultaneously demodulates the received signals based on the two received signals passing through the two branches (first branch 810 and second branch 820). In this case, this solution is referred to as Embodiment 2.

[0206] Compared to Example 1, Example 2 has the following differences.

[0207] 1. The communication device 800 is configured to receive only the second signal.

[0208] 2. The first frequency-amplitude converter 811 on the first branch 810 of the communication device 800 is configured to acquire second amplitude information of the fifth signal, the fifth signal being a signal acquired by performing frequency mixing on the second signal and the first local oscillator signal.

[0209] 3. The second branch 820 of the communication device 800 is configured to demodulate the sixth signal, which is a signal obtained by performing frequency mixing on the second signal and the second local oscillator signal, and the second local oscillator signal is a signal obtained by performing frequency offset correction on the first local oscillator signal based on the second amplitude information.

[0210] Optionally, in one example, the second local oscillator signal is a signal obtained by performing frequency offset correction on the first local oscillator signal based on second amplitude information and second ideal amplitude information.

[0211] The second ideal amplitude information can be understood as the amplitude information corresponding to a fifth signal obtained by performing frequency mixing on the second signal and the first local oscillator signal, when the first local oscillator signal does not have a frequency offset.

[0212] It should be noted that the second ideal amplitude information may be communicated to the communication device 800 by the transmitting device. Alternatively, the second ideal amplitude information may be calculated by the receiving device based on the transmission frequency of the second signal and the slope of the second frequency-amplitude conversion curve.

[0213] In this way, the relevant description in Example 1 is replaced in the following four ways: (1) The description that the communication device 800 is configured to receive the first and second signals is replaced by the description that the communication device 800 is configured to receive the second signal. (2) The third signal is replaced by the fifth signal. (3) The first amplitude information is replaced by the second amplitude information, and the first frequency offset value is replaced by the second frequency offset value. (4) The fourth signal is replaced by the sixth signal. In this way, the relevant description in Example 2 can be obtained. Therefore, further details are not described here again. [Examples]

[0214] From the above description of Examples 1 and 2, it can be seen that two branches need to be placed in the communication device 800, and one frequency-amplitude converter needs to be placed in each branch, so that one branch can perform frequency offset correction on the local oscillator signal generated by the communication device 800, and the other branch can demodulate the signal received by the communication device 800.

[0215] Furthermore, to reduce the complexity and cost of the communication device 800 system, embodiments of the present invention further provide other communication devices. Only one line is required for the communication device, and one frequency-amplitude converter is placed on that line, whose linear operating interval can be adjusted based on the frequency offset of the local oscillator signal generated by the communication device. In this way, the communication device requires only one path and one frequency-amplitude converter to perform frequency offset correction on the local oscillator signal generated by the communication device and to accurately demodulate the signal received by the communication device. The following are shown in Figures 13 to 13. 21 Refer to the documentation for information on communication devices.

[0216] Figure 13 shows the structure of another communication device 1400 according to an embodiment of the present invention.

[0217] The type of communication device 1400 in this embodiment is not limited in this application. For example, the communication device 1400 may be any of the devices shown in Figure 1, or the communication device 1400 may be a device within any of the devices shown in Figure 1.

[0218] The communication device 1400 shown in Figure 13 is configured to receive a second signal, which instructs the communication device to enter a connected state.

[0219] In this example, the transmitting device may periodically transmit a second signal. Correspondingly, the communication device 1400 may periodically receive the second signal transmitted by the transmitting device.

[0220] For the portion of the second signal not described in this embodiment, please refer to the relevant description in Example 1. Further details are not provided here.

[0221] Optionally, the transmitting device may further transmit data to the communication device 1400. Accordingly, the communication device 1400 is further configured to receive data.

[0222] The method of transmitting data is not limited in this embodiment of the present application.

[0223] For example, the transmitting device transmits the second signal and data using FDM. Optionally, in this example, a frequency guard interval may be set between the second signal and the data.

[0224] In this example, in order to reduce the power consumption of the communication device 1400, the communication device 1400 may receive the second signal and data on each of the two links.

[0225] Specifically, when the communication device 1400 is in a disconnected state, the first link of the communication device 1400 is operational. In this case, the second link of the communication device 1400 is unavailable. If the communication device 1400 needs to enter a connected state, it must first enable the first link. For example, when the communication device 1400 is in a disconnected state, it receives a second signal via the first link. After the communication device 1400 receives instruction information in the second signal that instructs it to receive data or enter a connected state, it triggers itself to enable the second link. Furthermore, after exchanging information with the transmitting device, the communication device 1400 enters a connected state and then receives data via the second link.

[0226] For example, as shown in Figure 13, the communication device 1400 includes a frequency-amplitude converter 1410 configured to acquire second amplitude information of a fifth signal at a first linear operating interval, the fifth signal being a signal obtained by performing frequency mixing on the second signal and the first local oscillator signal. In other words, the fifth signal obtained by performing frequency mixing on the second signal and the first local oscillator signal is input to the frequency-amplitude converter 1410, and the frequency-amplitude converter 1410 can acquire second amplitude information of the fifth signal.

[0227] Furthermore, the frequency-amplitude converter 1410 is further configured to demodulate the sixth signal at a second linear operating interval. The sixth signal is obtained by performing frequency mixing on the second signal and the second local oscillator signal, the second local oscillator signal is obtained by performing frequency offset correction on the first local oscillator signal based on the second amplitude information, and the second linear operating interval is smaller than the first linear operating interval.

[0228] Note that if the communication device 1400 is in a disconnected state, the frequency-amplitude converter 1410 of the communication device 1400 will use the first linear operating interval by default.

[0229] As described above, the communication device 1400 first acquires the second amplitude information of the fifth signal obtained by performing frequency mixing on the second signal and the first local oscillator signal using a frequency-amplitude converter 1410 that uses a first linear operating interval. Next, the communication device 1400 demodulates the sixth signal obtained by performing frequency mixing on the second local oscillator signal and the second signal using a frequency-amplitude converter 1410 that uses a second linear operating interval, and the second local oscillator signal is a signal obtained by performing frequency offset correction on the first local oscillator signal based on the second amplitude information. Since the first local oscillator signal has an offset, the first linear operating interval corresponding to the frequency-amplitude converter 1410 is set to be greater than the second linear operating interval, so that the frequency of the fifth signal obtained by performing frequency mixing on the second signal and the first local oscillator signal does not exceed the second linear operating interval corresponding to the frequency-amplitude converter 1410. Therefore, the frequency-amplitude converter 1410 can accurately acquire the second amplitude information of the fifth signal and then perform frequency offset correction on the first local oscillator signal based on the second amplitude information.

[0230] Furthermore, the communication device 1400 demodulates the sixth signal, which is obtained by performing frequency mixing on the second local oscillator signal and the second signal, by using a frequency-amplitude converter 1410 that uses a second linear operating interval. Since the second local oscillator signal is obtained by performing frequency offset correction on the first local oscillator signal, the frequency offset value of the sixth signal is smaller than the frequency offset value of the signal obtained by performing frequency mixing on the first local oscillator signal and the second signal. In this way, even when the second linear operating interval corresponding to the frequency-amplitude converter 1410 is set to be smaller (relative to the first linear operating interval), the sixth signal can still be demodulated accurately. Therefore, there is no serious impact on the demodulation performance of the communication device 1400.

[0231] Optionally, in one example, as shown in Figure 14, the frequency-amplitude converter 1410 includes a first capacitor 1411, an RLC resonator 1412, and a multiplier 1413. The signal S(t) input to the frequency-amplitude converter 1410 is split into two channels. One channel of the signal goes directly into the multiplier 1413. The other channel of the signal goes into the first capacitor 1411 and merges with the signal generated by the RLC resonator 1412 to form the signal Sp(t). The signal Sp(t) then goes into the multiplier 1413 for frequency mixing with the signal S(t), and the frequency-mixed signal S(t)Sp(t) is obtained. The other end of the RLC resonator 1412 is grounded.

[0232] Optionally, in one example, as shown in Figure 15, the RLC resonator 1412 includes a second capacitor 14121, an inductor 14122, and a variable resistor 14123 connected in parallel. The frequency fc of the resonant signal produced by the RLC resonator 1412 satisfies the following:

number

[0233] L is the inductance value of inductor 14122, C is the capacitance value of the second capacitor 14121, and fc is also the frequency of signal S(t).

[0234] After signal S(t) passes through the phase shift module, signal Sp(t) is obtained. Then, signal Sp(t) enters the multiplier for frequency mixing with signal S(t), and signal S(t)Sp(t) after frequency mixing is obtained.

[0235] The phase φ rotated by the frequency - amplitude converter 1410 of signal S(t) rot (f) satisfies the following equation:

Equation

[0236] R is the resistance value of variable resistor 14123, -2πf c RC is the slope of the frequency - amplitude conversion curve corresponding to the frequency - amplitude converter 1410. It can be seen that the slope of the frequency - amplitude conversion curve has a negative linear correlation with the resistance value R of the variable resistor 14123. Therefore, the slope of the frequency - amplitude conversion curve can be adjusted by adjusting the resistance value R of the variable resistor 14123.

[0237] From the above description of Example 1, it can be seen that the linear operating interval corresponding to the frequency - amplitude converter 1410 is related to the slope of the frequency - amplitude conversion curve. The larger the slope of the frequency - amplitude conversion curve, the smaller the linear operating interval corresponding to the frequency - amplitude converter 1410. Therefore, when it is necessary to adjust the first linear operating interval to a second linear operating interval smaller than the first linear operating interval, the slope of the frequency - amplitude conversion curve of the frequency - amplitude converter 1410 will increase. Furthermore, since the slope of the frequency - amplitude conversion curve has a negative linear correlation with the resistance value R of the variable resistor 14123, the Resistance value R can be increased to achieve the purpose of increasing the slope of the frequency - amplitude conversion curve of the frequency - amplitude converter 1410.

[0238] Optionally, in one example, as shown in Figure 16, the communication device 1400 further includes a frequency offset estimation module 1420. The frequency-amplitude converter 1410 is further configured to send a second amplitude information to the frequency offset estimation module 1420. The frequency offset estimation module 1420 is configured to obtain a second frequency offset value based on the second amplitude information. The frequency offset estimation module 1420 is further configured to send a control signal to the frequency offset estimation module 1420 if the second frequency offset value is smaller than a pre-set frequency offset value, the control signal instructing the frequency-amplitude converter 1410 to reduce the linear operating interval corresponding to the frequency-amplitude converter 1410. The frequency-amplitude converter 1410 is further configured to adjust the linear operating interval corresponding to the frequency-amplitude converter 1410 from a first linear operating interval to a second linear operating interval.

[0239] The specific value of the pre-set frequency offset is not limited in this embodiment of the present application and may be determined based on actual circumstances.

[0240] In the example, the frequency offset estimation module 1420 may obtain a second frequency offset value based on second amplitude information and second ideal amplitude information.

[0241] The second ideal amplitude information can be understood as the amplitude information corresponding to a fifth signal obtained by performing frequency mixing on the second signal and the first local oscillator signal, when the first local oscillator signal does not have a frequency offset.

[0242] It should be noted that the second ideal amplitude information may be transmitted to the communication device 1400 by the transmitting device. Alternatively, the second ideal amplitude information may be calculated by the receiving device based on the transmission frequency of the second signal and the slope of the first frequency-amplitude conversion curve.

[0243] Optionally, in one example, as shown in Figure 17, the communication device 1400 further includes a local oscillator 1430. A frequency offset estimation module 1420 is further configured to send a second frequency offset value to the local oscillator 1430. The local oscillator 1430 is configured to perform frequency offset correction on the first local oscillator signal based on the second frequency offset value to obtain the second local oscillator signal.

[0244] Optionally, in one example, as shown in Figure 18, the communication device 1400 further includes an envelope or amplitude detection module 1440. The frequency-amplitude converter 1410 is further configured to acquire fourth amplitude information of the sixth signal at a second linear operating interval and to send the fourth amplitude information to the envelope or amplitude detection module 1440. The envelope or amplitude detection module 1440 is configured to acquire modulation information of the sixth signal based on the fourth amplitude information.

[0245] How the envelope or amplitude detection module 1440 acquires modulation information of the sixth signal based on the fourth amplitude information is not limited in this embodiment of the present application.

[0246] In the example, when the transmitting device performs frequency shift keying modulation on the second signal, the envelope or amplitude detection module 1440 acquires the modulation information carried by the sixth signal based on the second amplitude information of the fifth signal.

[0247] In another example, when the transmitting device performs differential frequency modulation on the second signal, in other words, when a differential frequency modulation scheme is used for the second signal, the envelope or amplitude detection module 1440 first obtains the frequency difference of the fifth signal transmitted in adjacent time units based on the second amplitude information of the fifth signal, where the frequency of the fifth signal transmitted in the k-th time unit is f(k)=mod[f(k-1)+Δf1(k),B4], where f1(k) is the difference between the frequency of the k-th fifth signal and the frequency of the (k-1)-th fifth signal in the sequence of the fifth signal, B4 is a pre-set fourth bandwidth value, and k is an integer greater than 1, and then obtains the modulation information carried by the fifth signal based on the frequency difference of the fifth signal.

[0248] It should be noted that when k is 2, f(k-1)=f(1) can be any value. The specific value of f(1) is not limited in this embodiment of the present application.

[0249] Since the time interval between two consecutive time units is extremely short, even if there is a residual frequency offset in the local oscillator signal generated by the communication device, the residual frequency offset of the local oscillator signals generated by the communication device in two consecutive time units can be considered to be the same. In this way, the residual frequency offset of the local oscillator signal generated by the communication device can be canceled out by subtracting the frequencies of the fifth signal in the two consecutive time units (i.e., differential frequency modulation). Therefore, the demodulation performance of the communication device 1400 is not further affected.

[0250] For further details on this example, please refer to the relevant example in Example 1. Details will not be provided again here.

[0251] Furthermore, in the non-coherent FSK receiving device shown in Figure 4, the BPF is also an important module, capable of filtering signals in different frequency bands. However, as mentioned above, there is usually an offset between the ideal frequency and the frequency of the local oscillator signal generated by the LO. In this case, there is an offset Δf between the frequency of the signal obtained by frequency mixing the received signal and the local oscillator signal generated by the LO and the ideal frequency. If the offset Δf is large, the frequency of the signal obtained by frequency mixing the received signal and the local oscillator signal generated by the LO exceeds or partially exceeds the bandwidth of the BPF. In this way, the BPF removes or partially removes the signal obtained by frequency mixing the local oscillator signal and the received signal. As a result, the receiving device cannot demodulate the signal transmitted by the transmitting device.

[0252] Accordingly, embodiments of the present invention further provide other communication devices. These communication devices can perform frequency offset correction on a local oscillator signal. Furthermore, in the process of performing frequency offset correction on the local oscillator signal, the filter does not remove the signal obtained by performing frequency mixing on the local oscillator signal and the received signal. In this way, the communication device can receive a signal transmitted by a transmitting device and reduce errors in the baseband signal obtained by demodulating the received signal. This improves the demodulation performance of the receiving device.

[0253] The type of communication device in this embodiment is not limited in this application. For example, the communication device may be any device shown in Figure 1, or the communication device may be a device within any device shown in Figure 1.

[0254] For example, the communication device also includes two branches. One branch applies a filter to a signal obtained by performing frequency mixing on the local oscillator signal before correction and the received signal, and the other branch applies a filter to a signal obtained by performing frequency mixing on the local oscillator signal after correction and the received signal.

[0255] The two branches may operate in a time-division manner or simultaneously. For the sake of simplicity of description, the operation of the two branches in a time-division manner is represented as Example 4, and the operation of the two branches simultaneously is represented as Example 5.

[0256] For an example of how to implement the time-division operation of the two branches, refer to the above related description. Details are not described again here.

[0257] The following describes the communication device in detail by using Example 4 and Example 5 as examples.

Example

[0258] FIG. 19 is a diagram of the structure of another communication device according to an embodiment of the present application.

[0259] The communication device 900 shown in FIG. 19 is configured to receive a first signal and a second signal, and both the second signal and the first signal are from the same device (which may be called a transmitting device), and the second signal instructs the communication device to enter a connected state.

[0260] For an explanation of the communication device 900 being configured to receive the first signal and the second signal, refer to the related description of the communication device 800 being configured to receive the first signal and the second signal in Example 1. Details are not described again here.

[0261] For example, as shown in FIG. 19, the communication device 900 includes a first branch 910 and a second branch 920.

[0262] The first branch 910 includes a first filter 911, which is configured to filter a third signal, the third signal being obtained by performing frequency mixing on the first signal and the first local oscillator signal.

[0263] The second branch 920 includes a second filter 921. The second filter 921 is configured to filter a fourth signal, which is a signal obtained by performing frequency mixing on the second signal and the second local oscillator signal, which is a signal obtained by performing frequency offset correction on the first local oscillator signal based on the first amplitude information of the third signal, and the bandwidth of the second filter is narrower than the bandwidth of the first filter.

[0264] The type of the first filter 911 and / or the type of the second filter 921 is not limited in this embodiment of the present application. For example, the first filter 911 and / or the second filter 921 may be a band-pass filter or a low-pass filter.

[0265] As described above, the communication device 900 first filters the third signal obtained by frequency mixing the first signal and the first local oscillator signal by using the first filter 911 on the first branch 910. Next, the communication device 900 filters the fourth signal obtained by frequency mixing the second signal and the second local oscillator signal by using the second filter 921 on the second branch 920, in which case the second local oscillator signal is a signal obtained by performing frequency offset correction on the first local oscillator signal based on the first amplitude information of the third signal. Since the first local oscillator signal has a frequency offset, the bandwidth of the first filter 911 on the first branch 910 is set to be wider than the bandwidth of the second filter 921, so that the first filter 911 still does not remove the third signal even if the first local oscillator signal has a frequency offset. In this way, frequency offset correction can then be performed on the first local oscillator signal based on the third signal.

[0266] Furthermore, the communication device 900 filters the fourth signal, which is obtained by frequency mixing the second signal and the second local oscillator signal, by using the second filter 921 on the second branch 920. Since the second local oscillator signal is obtained by applying frequency offset correction to the first local oscillator signal, the frequency offset value of the fourth signal is smaller than the frequency offset value of the signal obtained by frequency mixing the first local oscillator signal and the second signal. In this way, the bandwidth of the second filter 921 on the second branch 920 is set to a smaller bandwidth (compared to the bandwidth of the first filter 911) to ensure that the second filter 921 does not remove the fourth signal even if residual frequency offsets exist, and the second filter 921 can remove out-of-band noise due to its narrow passband. This reduces the noise level of the communication device 900 and improves the performance of the communication device 900 in demodulating the fourth signal.

[0267] Optionally, in one example, as shown in Figure 20, the first branch 910 of the communication device 900 further includes a first frequency-amplitude converter 912. The first frequency-amplitude converter 912 is configured to acquire first amplitude information of a third signal. The communication device 900 also further includes a frequency offset estimation module 913 and a local oscillator 930. The first frequency-amplitude converter 912 is further configured to send first amplitude information to the frequency offset estimation module 913. The frequency offset estimation module 913 is configured to acquire a first frequency offset value based on the first amplitude information and to send the first frequency offset value to the local oscillator 930. The local oscillator 930 is configured to perform frequency offset correction on the first local oscillator signal based on the first frequency offset value and acquire a second local oscillator signal.

[0268] It should be noted that the third signal, in which the first frequency-amplitude converter 912 is configured to acquire the first amplitude information of the third signal, is the third signal obtained by filtering the third signal with the first filter 911.

[0269] Optionally, in one example, a first frequency-amplitude converter 912 The internal structure is the same as the internal structure of the first frequency-amplitude converter 811 described in Example 1. 912 For details regarding this section, please refer to the relevant description of the first frequency-amplitude converter 811. Further details will not be provided here.

[0270] Optionally, in one example, as shown in Figure 21, the second branch 920 of the communication device 900 further includes a second frequency-amplitude converter 922 configured to demodulate the filtered fourth signal. The linear operating interval corresponding to the second frequency-amplitude converter 922 is smaller than the linear operating interval corresponding to the first frequency-amplitude converter 912.

[0271] Optionally, in one example, the internal structure of the second frequency-amplitude converter 922 is the same as the internal structure of the second frequency-amplitude converter 821 in Example 1. For parts of the second frequency-amplitude converter 922 not described here, please refer to the relevant description of the second frequency-amplitude converter 821. Further details are not described here.

[0272] The reason why the linear operating interval corresponding to the second frequency-amplitude converter 922 is set to be smaller than the linear operating interval corresponding to the first frequency-amplitude converter 912, how to set the linear operating interval corresponding to the second frequency-amplitude converter 922 to be smaller than the linear operating interval corresponding to the first frequency-amplitude converter 912, and the technical effects brought about by setting the linear operating interval corresponding to the second frequency-amplitude converter 922 to be smaller than the linear operating interval corresponding to the first frequency-amplitude converter 912 are as follows: the linear operating interval corresponding to the second frequency-amplitude converter 821 is set to be smaller than the linear operating interval corresponding to the first frequency-amplitude converter 811 The reason why the linear operating interval corresponding to the second frequency-amplitude converter 821 is set to be smaller than that of the first frequency-amplitude converter 811 How to set it so that it is smaller than the corresponding linear operating interval, and the linear operating interval corresponding to the second frequency-amplitude converter 821 is set to the first frequency-amplitude converter 811 See the technical effects of setting it to be smaller than the corresponding linear operating interval. Further details are not provided here.

[0273] Optionally, in one example, the second branch 920 is configured to demodulate the fourth signal. For the process by which the fourth signal is demodulated by the second branch 920, please refer to the relevant description in Example 1 regarding the demodulation of the fourth signal by the second branch 820. Further details are not provided here. [Examples]

[0274] From the above description of Example 4, it can be seen that in Example 4, the communication device 900 is the first branch 910 It can be seen that the fifth signal, obtained by frequency mixing the received first signal and the first local oscillator signal, is filtered, and in this case the fifth signal is used to perform frequency offset correction on the first local oscillator signal. Next, the communication device 900 filters the sixth signal, obtained by frequency mixing the received second signal and the second local oscillator signal, using the second branch 920. In other words, the transmitting device needs to transmit two signals (the first signal and the second signal), and the communication device 900 filters the two received signals in a time-division multiplexer manner using two branches (the first branch 910 and the second branch 920) based on the two received signals.

[0275] Furthermore, to reduce the signaling overhead of the transmitting device, the transmitting device may alternatively transmit only one signal (the second signal). In this way, the communication device 900 filters the two received signals using two branches (first branch 910 and second branch 920) based on the received signals. The filtered signal in one branch may be used to perform frequency offset correction on the first local oscillator signal. In this case, this solution is referred to as Embodiment 5.

[0276] Compared to Example 4, Example 5 has the following differences.

[0277] 1. The communication device 900 is configured to receive only the second signal.

[0278] 2. The first filter 911 on the first branch 910 of the communication device 900 is configured to filter the fifth signal, which is a signal obtained by performing frequency mixing on the second signal and the first local oscillator signal.

[0279] 3. The second filter 921 on the second branch 920 of the communication device 900 is configured to filter the sixth signal, the sixth signal being obtained by performing frequency mixing on the second signal and the second local oscillator signal, the second local oscillator signal being obtained by performing frequency offset correction on the first local oscillator signal based on the second amplitude information of the fifth signal.

[0280] In this way, the relevant description in Example 4 is replaced in the following four ways: (1) The description that the communication device 900 is configured to receive the first and second signals is replaced by the description that the communication device 900 is configured to receive the second signal. (2) The third signal is replaced by the fourth signal. (3) The first amplitude information is replaced by the second amplitude information. (4) The fourth signal is replaced by the sixth signal. In this way, the relevant description in Example 5 can be obtained. Therefore, further details are not described here again. [Examples]

[0281] From the above descriptions of Examples 4 and 5, it can be seen that two branches need to be placed in the communication device 900, and a filter needs to be placed in each branch, so that one branch can filter the signal obtained by performing frequency mixing on the received signal and the local oscillator signal generated by the communication device 900, and the other branch can filter the signal obtained by performing frequency mixing on the received signal and the local oscillator signal generated by the communication device 900.

[0282] Furthermore, in order to reduce the complexity and cost of the communication device 900 system, embodiments of the present invention further provide other communication devices. Only one line is required for the communication device, and one filter is placed on that line, the bandwidth of which can be adjusted based on the frequency offset of the local oscillator signal generated by the communication device. In this way, the communication device requires only one path and one filter to perform filtering of the acquired signal by performing frequency mixing of the uncorrected local oscillator signal and the received signal, and to perform filtering of the acquired signal by performing frequency mixing of the corrected local oscillator signal and the received signal. The communication device is described below with reference to Figures 22 to 26.

[0283] Figure 22 is a diagram showing the structure of another communication device 1500 according to an embodiment of the present invention.

[0284] The type of communication device 1500 in this embodiment is not limited in this application. For example, the communication device 1500 may be any of the devices shown in Figure 1, or the communication device 1500 may be a device within any of the devices shown in Figure 1.

[0285] The communication device 1500 shown in Figure 22 is configured to receive a second signal, which instructs the communication device to enter a connected state.

[0286] For an explanation of how communication device 1500 is configured to receive the second signal, please refer to the related description of how communication device 1400 is configured to receive the second signal. Further details are not provided here.

[0287] For example, as shown in Figure 22, the communication device 1500 includes a filter 1510 configured to filter a fifth signal based on a first bandwidth, the fifth signal being a signal obtained by performing frequency mixing on a second signal and a first local oscillator signal.

[0288] Furthermore, filter 1510 is configured to filter the sixth signal based on a second bandwidth, the sixth signal being obtained by performing frequency mixing on the second signal and the second local oscillator signal, the second local oscillator signal being obtained by performing frequency offset correction on the first local oscillator signal based on the second amplitude information of the sixth signal, and the second bandwidth is narrower than the first bandwidth.

[0289] It should be noted that the type of filter 1510 is not limited to this embodiment of the present application. For example, filter 1510 may be a band-pass filter or a low-pass filter.

[0290] Furthermore, if the communication device 1500 is in a disconnected state, the filter 1510 of the communication device 1500 uses the first bandwidth by default.

[0291] As mentioned above, communication device 1500 Filter 1510 filters the fifth signal, which is obtained by performing frequency mixing on the second signal and the first local oscillator signal, based on the first bandwidth. Next, filter 1510 filters the sixth signal, which is obtained by performing frequency mixing on the second signal and the second local oscillator signal, based on the second bandwidth, the second local oscillator signal being obtained by performing frequency offset correction on the first local oscillator signal based on the second amplitude information of the fifth signal. Since the first local oscillator signal has a frequency offset, the bandwidth of filter 1510 is set to be wider than the second bandwidth, so that filter 1510 still does not remove the fifth signal, even if the first local oscillator signal has a frequency offset. In this way, frequency correction can then be performed on the first local oscillator signal based on the fifth signal.

[0292] Furthermore, communication devices 1500Filter 1510 filters the sixth signal, which is obtained by performing frequency mixing of the second signal and the second local oscillator signal, based on the second bandwidth. Since the second local oscillator signal is obtained by performing frequency offset correction on the first local oscillator signal, the frequency offset value of the sixth signal is smaller than the frequency offset value of the signal obtained by performing frequency mixing of the first local oscillator signal and the second signal. In this way, even if the bandwidth of filter 1510 is set to a smaller bandwidth (relative to the first bandwidth), it is ensured that filter 1510 does not remove the sixth signal even if residual frequency offset exists, and because filter 1510 has a narrow bandwidth, it can remove out-of-band noise. This reduces the noise level of the communication device 1500 and improves the performance of the communication device 1500 in demodulating the sixth signal.

[0293] Optionally, in one example, as shown in Figure 23, a communication device 1500 The system further includes a frequency-amplitude converter 1410. The use of the frequency-amplitude converter 1410 is described in Example 3. Further details are not provided here.

[0294] It should be noted that, in the case where the frequency-amplitude converter 1410 is configured to acquire the second amplitude information of the fifth signal, the fifth signal is the fifth signal obtained by filtering the fifth signal based on the first bandwidth using the filter 1510. Also, in the case where the frequency-amplitude converter 1410 is configured to demodulate the sixth signal, the sixth signal is the sixth signal obtained by filtering the sixth signal based on the second bandwidth using the filter 1510.

[0295] For further details regarding the frequency-amplitude converter 1410, please refer to the relevant description in Example 3. Further details are not provided here.

[0296] Optionally, in one example, as shown in Figure 24, the communication device 1500 further includes a frequency offset estimation module 1420. The use of the frequency offset estimation module 1420 is described in Example 3. Further details are not described here again.

[0297] Optionally, in one example, the communication device 1500 further includes a local oscillator 1430, as shown in Figure 25. Local oscillator The use of 1430 is described in Example 3. Further details are not provided here.

[0298] Optionally, in one example, as shown in Figure 26, the communication device 1500 further includes an envelope or amplitude detection module 1440. The use of the envelope or amplitude detection module 1440 is described in Example 3. Further details are not described here again.

[0299] It should be noted that in this embodiment of the present application, the communication devices 800, 1400, 900, and / or 1500 described above may further include other modules not described herein. This is not limited to the present application.

[0300] For example, communication device 800, communication device 1400, communication device 900, and / or communication device 1500 may further include other filters, amplifiers, etc.

[0301] For example, other filters may include RF BPF and / or LPF.

[0302] In the communication device 800, the RF BPF is configured to filter the first signal and / or second signal received by the antenna by the communication device 800, and the LPF is configured to filter the amplitude information acquired by the first frequency-amplitude converter 811 and / or the second frequency-amplitude converter 821.

[0303] In communication device 1400 and / or communication device 1500, the RF BPF is configured to filter the second signal received by the antenna by communication device 1400 and / or communication device 1500, and the LPF is configured to filter the amplitude information acquired by the frequency-amplitude converter 1410.

[0304] In the communication device 900, the RF BPF is configured to filter the second signal received by the antenna by the communication device 900, and the LPF is configured to filter the amplitude information acquired by the first frequency-amplitude converter 912 and / or the second frequency-amplitude converter 922.

[0305] For example, the amplifier may include an RF LNA and an IF LNA.

[0306] In the communication device 800, the RF LNA is configured to amplify the first signal and / or the second signal acquired by filtering by the RF BPF, and the IF LNA is configured to amplify the third signal and / or the fourth signal.

[0307] In communication device 1400, communication device 900, and / or communication device 1500, the RF LNA is configured to amplify the second signal acquired by filtering by the RF BPF, and the IF LNA is configured to amplify the fifth signal and / or the sixth signal.

[0308] Referring to Figures 27 to 32, the communication method provided in the embodiment of the present invention will be described in detail below.

[0309] The communication method may be applied to a communication system including a first device and a second device. In the example, the first device may be a base station or satellite site as shown in Figure 1, and the second device may be a terminal device as shown in Figure 1.

[0310] In other examples, the first device may be the terminal device shown in Figure 1, and the second device may be another terminal device shown in Figure 1.

[0311] In further other examples, the first device may be a transmitting device as described in the relevant above description relating to communication device 800, communication device 1400, communication device 900, or communication device 1500, and the second device may be communication device 800, communication device 1400, communication device 900, or communication device 1500.

[0312] In this implementation, the second device includes a first branch and a second branch, the first branch includes a first frequency-amplitude converter, and the second branch includes a second frequency-amplitude converter, with the linear operating interval corresponding to the second frequency-amplitude converter being smaller than the linear operating interval corresponding to the first frequency-amplitude converter. Referring to Figures 27 and 28, the communication method in this implementation is described below.

[0313] Figure 27 is a schematic flowchart of the communication method 1000 according to an embodiment of the present invention.

[0314] For example, as shown in Figure 27, communication method 1000 is S1010 to S 1040 This includes S1010 to S 1040 Each of these will be described in detail individually.

[0315] S1010: The first device sends a first signal to the second device. Accordingly, the second device receives the first signal transmitted by the first device.

[0316] S1020: The first device sends the second signal to the second device. Accordingly, the second device receives the second signal transmitted by the first device.

[0317] S1030: The second device acquires the first amplitude information of the third signal by using the first frequency-amplitude converter, in which case the third signal is a signal obtained by performing frequency mixing on the first signal and the first local oscillator signal.

[0318] S1040: The second device demodulates the fourth signal using the second branch, where the fourth signal is obtained by performing frequency mixing on the second signal and the second local oscillator signal, and the second local oscillator signal is obtained by performing frequency offset correction on the first local oscillator signal based on the first amplitude information.

[0319] For details regarding communication method 1000, which is not described here, please refer to the relevant description in Example 1. Further details are not provided here.

[0320] Figure 28 is a schematic flowchart of the communication method 1100 according to an embodiment of the present invention.

[0321] For example, as shown in Figure 28, the communication method 1100 includes S1110 to S1130. The following describes S1110 to S1130 in detail.

[0322] S1110: The first device sends the second signal to the second device. Accordingly, the second device receives the second signal transmitted by the first device.

[0323] S1120: The second device acquires the second amplitude information of the fifth signal by using the first frequency-amplitude converter, in which case the fifth signal is a signal obtained by performing frequency mixing on the second signal and the first local oscillator signal.

[0324] S1130: The second device demodulates the sixth signal using the second branch, where the sixth signal is obtained by performing frequency mixing on the second signal and the second local oscillator signal, and the second local oscillator signal is obtained by performing frequency offset correction on the first local oscillator signal based on the second amplitude information.

[0325] For details regarding communication method 1100, which is not described here, please refer to the relevant description in Example 2. Further details are not provided here.

[0326] In other possible implementations, the second device includes a line, the line includes a frequency-amplitude converter, and the linear operating interval corresponding to the frequency-amplitude converter may be adjusted by the frequency offset of the local oscillator signal generated by the second device. Referring to Figure 29, the communication method in this implementation is described below.

[0327] Figure 29 is a schematic flowchart of the communication method 1600 according to an embodiment of the present invention.

[0328] For example, as shown in Figure 29, communication method 1600 includes S1610 to S1630. The following describes S1610 to S1630 in detail.

[0329] S1610: The first device sends the second signal to the second device. Accordingly, the second device receives the second signal transmitted by the first device.

[0330] S1620: The frequency-amplitude converter of the second device acquires the second amplitude information of the fifth signal during the first linear operating interval, where the fifth signal is a signal obtained by performing frequency mixing on the second signal and the first local oscillator signal.

[0331] S1630: The frequency-amplitude converter of the second device demodulates the sixth signal at the second linear operating interval, where the sixth signal is obtained by performing frequency mixing on the second signal and the second local oscillator signal, and the second local oscillator signal is obtained by performing frequency offset correction on the first local oscillator signal based on the second amplitude information, and the second linear operating interval is smaller than the first linear operating interval.

[0332] For details regarding communication method 1600, which is not described here, please refer to the relevant description in Example 3. Further details are not provided here.

[0333] In further possible implementations, the second device includes a first branch and a second branch, the first branch includes a first filter, and the second branch includes a second filter, with the bandwidth of the second filter being narrower than that of the first filter. Referring to Figures 30 and 31, the communication method in this implementation is described below.

[0334] Figure 30 is a schematic flowchart of the communication method 1200 according to an embodiment of the present invention.

[0335] For example, as shown in Figure 30, the communication method 1200 includes S1210 to S1240. The following describes S1210 to S1240 in detail.

[0336] S1210: The first device sends the first signal to the second device. Accordingly, the second device receives the first signal transmitted by the first device.

[0337] S1220: The first device sends the second signal to the second device. Accordingly, the second device receives the second signal transmitted by the first device.

[0338] S1230: The second device filters the third signal using the first filter, and the third signal is obtained by performing frequency mixing on the first signal and the first local oscillator signal.

[0339] S1240: The second device filters the fourth signal using the second filter, in which case the fourth signal is a signal obtained by performing frequency mixing on the second signal and the second local oscillator signal, and the second local oscillator signal is a signal obtained by performing frequency offset correction on the first local oscillator signal based on the first amplitude information of the third signal.

[0340] For details regarding communication method 1200, which is not described here, please refer to the relevant description in Example 4. Further details are not provided here.

[0341] Figure 31 is a schematic flowchart of the communication method 1300 according to an embodiment of the present invention.

[0342] For example, as shown in Figure 31, the communication method 1300 includes S1310 to S1330. The following describes S1310 to S1330 in detail.

[0343] S1310: The first device sends the second signal to the second device. Accordingly, the second device receives the second signal transmitted by the first device.

[0344] S1320: The second device filters the fifth signal using the first filter, and the fifth signal is obtained by performing frequency mixing on the second signal and the first local oscillator signal.

[0345] S1330: The second device filters the sixth signal using the second filter, in which case the sixth signal is a signal obtained by performing frequency mixing on the second signal and the second local oscillator signal, and the second local oscillator signal is a signal obtained by performing frequency offset correction on the first local oscillator signal based on the second amplitude information of the fifth signal.

[0346] Communication methods not listed 1300 For details regarding that section, please refer to the relevant description in Example 5. Further details will not be provided here.

[0347] In further possible implementations, the second device includes a line, the line includes a filter, and the bandwidth of the filter may be adjusted by the frequency offset of the local oscillator signal generated by the second device. Referring to Figure 32, the communication method in this implementation is described below.

[0348] Figure 32 is a schematic flowchart of the communication method 1700 according to an embodiment of the present invention.

[0349] For example, as shown in Figure 32, the communication method 1700 includes S1710 to S1730. The following describes S1710 to S1730 in detail.

[0350] S1710: The first device sends the second signal to the second device. Accordingly, the second device receives the second signal transmitted by the first device.

[0351] S1720: The filter of the second device filters the fifth signal based on the first bandwidth, and the fifth signal is a signal obtained by performing frequency mixing on the second signal and the first local oscillator signal.

[0352] S1730: The filter of the second device filters the sixth signal based on the second bandwidth, where the sixth signal is obtained by frequency mixing the second signal with the second local oscillator signal, and the second local oscillator signal is obtained by frequency offset correction applied to the first local oscillator signal based on the second amplitude information of the fifth signal, where the second bandwidth is narrower than the first bandwidth.

[0353] For details regarding communication method 1700, which is not described here, please refer to the relevant description in Example 6. Further details are not provided here.

[0354] Embodiments of the present application provide a communication system including a first device and a second device. The system is configured to perform the technical solution of the above embodiment. Its implementation principle and technical effects are the same as those of the embodiments related to the above method. Further details are not described here again.

[0355] Embodiments of the present application provide a computer program product. When the computer program product is executed on a device, the device can perform the technical solution of the above embodiment. The principle of implementation and technical effect are the same as those of the embodiments related to the above method. Details are not described again here. The device may include the first or second device described in the above embodiment.

[0356] Embodiments of the present application provide a readable storage medium. The readable storage medium contains instructions. When instructions are executed on the device, the device can perform the technical solution of the above embodiment. The principle of implementation and the technical effect are the same. Further details are not described here again. The device may include the first or second device described in the above embodiment.

[0357] Embodiments of the present invention provide a chip configured to execute instructions. When the chip is executed, the technical solution of the above embodiment is performed. Its implementation principle and technical effect are the same. Further details are not described here again.

[0358] Those skilled in the art will notice, in combination with the examples described in the embodiments disclosed herein, that the units and algorithmic steps may be implemented by electronic hardware or a combination of computer software and electronic hardware. Whether the functions are performed by hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art may use different methods to implement the described functions for each specific application, but it should not be conceivable that the implementation would exceed the scope of the embodiments of this application.

[0359] Those skilled in the art should, for convenience and for the sake of brevity, refer to the corresponding processes in the embodiments of the above-described methods for detailed operating processes of the above-described systems, apparatus, and units. Further details are not described here.

[0360] In some embodiments provided herein, it should be understood that the disclosed systems, apparatus, and methods may be implemented in other ways. For example, the embodiments of the apparatus described are merely examples. For example, the division into units is merely a logical functional division, and other divisions may be used in actual implementation. For example, multiple units or components may be coupled or integrated into other systems, or some features may be ignored or not performed. Also, the mutual coupling, direct coupling, or communication connection shown or discussed may be implemented by some interface. Indirect coupling or communication connection between apparatus or units may be implemented electronically, mechanically, or in other forms.

[0361] Units described as separate parts may or may not be physically separated, and parts shown as units may or may not be physical units, may be located in one place, or may be distributed across multiple network units. Some or all units may be selected based on actual requirements to achieve the objectives of the solution of the embodiment.

[0362] Furthermore, the functional units in the embodiments of the present invention may be integrated into a single processing unit, each unit may exist independently, or two or more units may be integrated into a single unit.

[0363] If the function is implemented in the form of a software function unit and sold or used as an independent product, the function may be stored on a computer-readable storage medium. Based on such understanding, the technical solutions of the embodiments of the present application may be implemented in the form of a software product, either essentially or in part with respect to the prior art. A computer software product is stored on a storage medium and includes several instructions for instructing a computer device (which may be a personal computer, server, network device, etc.) to perform all or part of the steps of the method described in the embodiments of the present application. The storage medium includes any medium capable of storing program code, such as a USB flash drive, removable hard disk, read-only memory (ROM), random access memory (RAM), magnetic disk, or optical disk.

[0364] The above description merely provides specific examples of the present application and is not intended to limit the scope of protection. Any modifications or substitutions that a person skilled in the art could easily conceive within the technical scope disclosed herein should fall within the scope of protection. Accordingly, the scope of protection should be subject to the scope of protection of the claims.

[0365] This application claims priority based on Chinese Patent Application No. 202210474157.2, filed with the China National Intellectual Property Administration on April 29, 2022, with the title of the invention being "RECEIVER," which is incorporated herein by reference in its entirety.

[0366] This application claims priority based on Chinese Patent Application No. 202210800941.8, filed with the China National Intellectual Property Administration on July 8, 2022, with the title of the invention being "COMMUNICATION APPARATUS AND COMMUNICATION METHOD," which is incorporated herein by reference in its entirety.

Claims

1. A communication device, The communication device is configured to receive a first signal and a second signal, both of which originate from the same device, and the second signal instructs the communication device to enter a connected state. The aforementioned communication device includes a first branch and a second branch, The first branch includes a first frequency-amplitude converter configured to acquire first amplitude information of a third signal, the third signal being a signal obtained by performing frequency mixing on the first signal and a first local oscillator signal, and the first local oscillator signal being a local oscillator signal generated by the communication device. The second branch is configured to demodulate the fourth signal, the fourth signal being obtained by performing frequency mixing on the second signal and the second local oscillator signal, the second local oscillator signal being obtained by performing frequency offset correction on the first local oscillator signal based on the first amplitude information, and the second branch includes a second frequency-amplitude converter, the second frequency range in which the frequency-amplitude conversion by the second frequency-amplitude converter is linear is smaller than the first frequency range in which the frequency-amplitude conversion by the first frequency-amplitude converter is linear. Communication device.

2. The communication device further includes a frequency offset estimation module and a local oscillator. The first frequency-amplitude converter is further configured to send the first amplitude information to the frequency offset estimation module. The frequency offset estimation module is configured to acquire a first frequency offset value based on the first amplitude information and to send the first frequency offset value to the local oscillator. The local oscillator is configured to perform frequency offset correction on the first local oscillator signal based on the first frequency offset value to acquire the second local oscillator signal. The communication device according to claim 1.

3. The first frequency-amplitude converter includes a first phase shift unit, which introduces different phase shifts to signals of different frequencies based on a first frequency-amplitude curve. The second frequency-amplitude converter includes a second phase shift unit, which introduces different phase shifts to signals of different frequencies based on a second frequency-amplitude curve, wherein the slope of the second frequency-amplitude curve in the second frequency range is greater than the slope of the first frequency-amplitude curve in the first frequency range. The first frequency-amplitude curve and the second frequency-amplitude curve are represented in a graph with frequency on the horizontal axis and amplitude on the vertical axis. The communication device according to claim 1.

4. A differential frequency modulation scheme is used for the second signal. The second frequency-amplitude converter is configured to acquire the third amplitude information of the fourth signal. The aforementioned second branch further, Based on the third amplitude information of the fourth signal, the frequency difference of the fourth signal transmitted in adjacent time units is obtained, and if the frequency f(i) of the fourth signal transmitted in the i-th time unit in the sequence of the fourth signal is smaller than the frequency f(i-1) of the fourth signal transmitted in the (i-1)-th time unit in the sequence of the fourth signal, The frequency f(i) of the fourth signal transmitted in the i-th time unit is given by f(i) = mod[f(i-1) + Δf １ (i), B1] is the adjusted frequency, and Δf １ (i) is the difference between the pre-adjusted frequency f'(i) that was to be transmitted in the i-th time unit and the frequency f(i-1) of the fourth signal transmitted in the (i-1)-th time unit, B1 is a pre-set first bandwidth value, and i is an integer greater than 1. The frequency f(i) of the fourth signal transmitted in the i-th time unit is restored to the frequency f'(i) before adjustment, and the frequency difference between the f'(i) before adjustment and the frequency f(i-1) of the fourth signal transmitted in the (i-1)-th time unit is determined. Based on the frequency difference of the fourth signal, the modulation information carried by the fourth signal is acquired. It is particularly structured as follows: The communication device according to claim 1.

5. A differential frequency modulation scheme is used for the first signal, and the first branch is Based on the first amplitude information, the frequency difference of the third signal transmitted in adjacent time units is obtained, and if the frequency f(j) of the third signal transmitted in the j-th time unit in the sequence of the third signal is smaller than the frequency f(j-1) of the third signal transmitted in the (j-1)-th time unit in the sequence of the third signal, The frequency f(j) of the third signal transmitted in the j-th time unit is given by f(j) = mod[f(j-1) + Δf １ (j), B3] is the adjusted frequency, and Δf １ (j) is the difference between the pre-adjusted frequency f'(j) that was to be transmitted in the j-th time unit and the frequency f(j-1) of the third signal transmitted in the (j-1)-th time unit, B3 is a pre-set third bandwidth value, and j is an integer greater than 1. The frequency f(j) of the third signal transmitted in the j-th time unit is restored to the frequency f'(j) before adjustment, and the frequency difference between the f'(j) before adjustment and the frequency f(j-1) of the third signal transmitted in the (j-1)-th time unit is determined. Based on the frequency difference of the third signal, the modulation information carried by the third signal is acquired. Structured in such a way The communication device according to claim 1.

6. A communication device, The communication device is configured to receive a second signal, and the second signal instructs the communication device to enter a connected state. The aforementioned communication device includes a first branch and a second branch, The first branch includes a first frequency-amplitude converter configured to acquire second amplitude information of a fifth signal, the fifth signal being a signal obtained by performing frequency mixing on the second signal and a first local oscillator signal, and the first local oscillator signal being a local oscillator signal generated by the communication device. The second branch is configured to demodulate the sixth signal, the sixth signal being obtained by performing frequency mixing on the second signal and the second local oscillator signal, the second local oscillator signal being obtained by performing frequency offset correction on the first local oscillator signal based on the second amplitude information, and the second branch includes a second frequency-amplitude converter, the second frequency range in which the frequency-amplitude conversion by the second frequency-amplitude converter is linear is smaller than the first frequency range in which the frequency-amplitude conversion by the first frequency-amplitude converter is linear. Communication device.

7. The communication device further includes a frequency offset estimation module and a local oscillator. The first frequency-amplitude converter is further configured to send the second amplitude information to the frequency offset estimation module. The frequency offset estimation module is configured to acquire a second frequency offset value based on the second amplitude information and to send the second frequency offset value to the local oscillator. The local oscillator is configured to perform frequency offset correction on the first local oscillator signal based on the second frequency offset value to acquire the second local oscillator signal. The communication device according to claim 6.

8. The first frequency-amplitude converter includes a first phase shift unit, which introduces different phase shifts to signals of different frequencies based on a first frequency-amplitude curve. The second frequency-amplitude converter includes a second phase shift unit, which introduces different phase shifts to signals of different frequencies based on a second frequency-amplitude curve, wherein the slope of the second frequency-amplitude curve in the second frequency range is greater than the slope of the first frequency-amplitude curve in the first frequency range. The first frequency-amplitude curve and the second frequency-amplitude curve are represented in a graph with frequency on the horizontal axis and amplitude on the vertical axis. The communication device according to claim 6.

9. A differential frequency modulation scheme is used for the second signal, and the second branch is further, The frequency difference of the filtered sixth signal transmitted in adjacent time units is obtained, and when the frequency f(i) of the filtered sixth signal transmitted in the i-th time unit in the sequence of the filtered sixth signal is smaller than the frequency f(i-1) of the filtered sixth signal transmitted in the (i-1)-th time unit in the sequence of the filtered sixth signal, The frequency f(i) of the filtered sixth signal transmitted in the i-th time unit is given by f(i) = mod[f(i-1) + Δf ２ (i), B2] is the adjusted frequency, and Δf ２ (i) is the difference between the unadjusted frequency f'(i) that was to be transmitted in the i-th time unit and the frequency f(i-1) of the filtered sixth signal transmitted in the (i-1)-th time unit, B2 is a pre-set second bandwidth value, and i is an integer greater than 1. The frequency f(i) of the filtered sixth signal transmitted in the i-th time unit is restored to the frequency f'(i) before adjustment, and the frequency difference between the f'(i) before adjustment and the frequency f(i-1) of the filtered sixth signal transmitted in the (i-1)-th time unit is determined. Based on the frequency difference of the filtered sixth signal, the modulation information carried by the filtered sixth signal is acquired. It is particularly structured as follows: The communication device according to claim 6.

10. A communication device, The communication device is configured to receive a first signal and a second signal, both of which originate from the same device, and the second signal instructs the communication device to enter a connected state. The aforementioned communication device includes a first branch and a second branch, The first branch includes a first filter configured to filter a third signal, the third signal being a signal obtained by performing frequency mixing on the first signal and a first local oscillator signal, the first local oscillator signal being a local oscillator signal generated by the communication device. The second branch includes a second filter configured to filter a fourth signal, the fourth signal being a signal obtained by performing frequency mixing on the second signal and a second local oscillator signal, the second local oscillator signal being a signal obtained by performing frequency offset correction on the first local oscillator signal based on first amplitude information of the third signal, and the bandwidth of the second filter being narrower than the bandwidth of the first filter. The first branch further includes a first frequency-amplitude converter configured to acquire the first amplitude information, and the second branch further includes a second frequency-amplitude converter configured to demodulate the filtered fourth signal, wherein the second frequency range in which the frequency-amplitude conversion by the second frequency-amplitude converter is linear is smaller than the first frequency range in which the frequency-amplitude conversion by the first frequency-amplitude converter is linear. Communication device.

11. The communication device further includes a frequency offset estimation module and a local oscillator, The first frequency-amplitude converter is further configured to send the first amplitude information to the frequency offset estimation module. The frequency offset estimation module is configured to acquire a first frequency offset value based on the first amplitude information and to send the first frequency offset value to the local oscillator. The local oscillator is configured to perform frequency offset correction on the first local oscillator signal based on the first frequency offset value to acquire the second local oscillator signal. The communication device according to claim 10.

12. The first frequency-amplitude converter includes a first phase shift unit, which introduces different phase shifts to signals of different frequencies based on a first frequency-amplitude curve. The second frequency-amplitude converter includes a second phase shift unit, which introduces different phase shifts to signals of different frequencies based on a second frequency-amplitude curve, wherein the slope of the second frequency-amplitude curve in the second frequency range is greater than the slope of the first frequency-amplitude curve in the first frequency range. The first frequency-amplitude curve and the second frequency-amplitude curve are represented in a graph with frequency on the horizontal axis and amplitude on the vertical axis. The communication device according to claim 10.

13. A differential frequency modulation scheme is used for the second signal. The second frequency-amplitude converter is configured to acquire the third amplitude information of the fourth signal. The aforementioned second branch further, Based on the third amplitude information of the fourth signal, the frequency difference of the fourth signal transmitted in adjacent time units is obtained, and if the frequency f(i) of the fourth signal transmitted in the i-th time unit in the sequence of the fourth signal is smaller than the frequency f(i-1) of the fourth signal transmitted in the (i-1)-th time unit in the sequence of the fourth signal, The frequency f(i) of the fourth signal transmitted in the i-th time unit is given by f(i) = mod[f(i-1) + Δf １ (i), B1] is the adjusted frequency, and Δf １ (i) is the difference between the pre-adjusted frequency f'(i) that was to be transmitted in the i-th time unit and the frequency f(i-1) of the fourth signal transmitted in the (i-1)-th time unit, B1 is a pre-set first bandwidth value, and i is an integer greater than 1. The frequency f(i) of the fourth signal transmitted in the i-th time unit is restored to the frequency f'(i) before adjustment, and the frequency difference between the f'(i) before adjustment and the frequency f(i-1) of the fourth signal transmitted in the (i-1)-th time unit is determined. Based on the frequency difference of the filtered fourth signal, the modulation information carried by the filtered fourth signal is acquired. It is particularly structured as follows: The communication device according to claim 10.

14. A differential frequency modulation scheme is used for the first signal, and the first branch is Based on the first amplitude information, the frequency difference of the third signal transmitted in adjacent time units is obtained, and if the frequency f(j) of the third signal transmitted in the j-th time unit in the sequence of the third signal is smaller than the frequency f(j-1) of the third signal transmitted in the (j-1)-th time unit in the sequence of the third signal, The frequency f(j) of the third signal transmitted in the j-th time unit is f(j) = mod[f(j - 1)+Δf １ (j), B3], which is the adjusted frequency based on, and Δf １ (j) is the difference between the frequency f'(j) before adjustment, which was to be transmitted in the j-th time unit, and the frequency f(j - 1) of the third signal transmitted in the (j - 1)-th time unit, B3 is a preset third bandwidth value, and j is an integer greater than 1 The frequency f(j) of the third signal transmitted in the j-th time unit is restored to the frequency f'(j) before adjustment, and the frequency difference between the f'(j) before adjustment and the frequency f(j-1) of the third signal transmitted in the (j-1)-th time unit is determined. Based on the frequency difference of the third signal, the modulation information carried by the third signal is acquired. Structured in such a way The communication device according to claim 10.

15. A communication device, The communication device is configured to receive a second signal, and the second signal instructs the communication device to enter a connected state. The aforementioned communication device includes a first branch and a second branch, The first branch includes a first filter configured to filter a fifth signal, the fifth signal being a signal obtained by performing frequency mixing on the second signal and a first local oscillator signal, and the first local oscillator signal being a local oscillator signal generated by the communication device. The second branch includes a second filter configured to filter the sixth signal, The sixth signal is a signal obtained by performing frequency mixing on the second signal and the second local oscillator signal, the second local oscillator signal is a signal obtained by performing frequency offset correction on the first local oscillator signal based on the second amplitude information of the fifth signal, and the bandwidth of the second filter is narrower than the bandwidth of the first filter. The first branch further includes a first frequency-amplitude converter configured to acquire the second amplitude information, and the second branch further includes a second frequency-amplitude converter configured to demodulate the filtered sixth signal, wherein the second frequency range in which the frequency-amplitude conversion by the second frequency-amplitude converter is linear is smaller than the first frequency range in which the frequency-amplitude conversion by the first frequency-amplitude converter is linear. Communication device.

16. The communication device further includes a frequency offset estimation module and a local oscillator, The first frequency-amplitude converter is further configured to send the second amplitude information to the frequency offset estimation module. The frequency offset estimation module is configured to acquire a second frequency offset value based on the second amplitude information and to send the second frequency offset value to the local oscillator. The local oscillator is configured to perform frequency offset correction on the first local oscillator signal based on the second frequency offset value to acquire the second local oscillator signal. The communication device according to claim 15.

17. The first frequency-amplitude converter includes a first phase shift unit, which introduces different phase shifts to signals of different frequencies based on a first frequency-amplitude curve. The second frequency-amplitude converter includes a second phase shift unit, which introduces different phase shifts to signals of different frequencies based on a second frequency-amplitude curve, wherein the slope of the second frequency-amplitude curve in the second frequency range is greater than the slope of the first frequency-amplitude curve in the first frequency range. The first frequency-amplitude curve and the second frequency-amplitude curve are represented in a graph with frequency on the horizontal axis and amplitude on the vertical axis. The communication device according to claim 15.

18. A differential frequency modulation scheme is used for the second signal, and the second branch is further, The frequency difference of the filtered sixth signal transmitted in adjacent time units is obtained, and when the frequency f(i) of the filtered sixth signal transmitted in the i-th time unit in the sequence of the filtered sixth signal is smaller than the frequency f(i-1) of the filtered sixth signal transmitted in the (i-1)-th time unit in the sequence of the filtered sixth signal, The frequency f(i) of the filtered sixth signal transmitted in the i-th time unit is given by f(i) = mod[f(i-1) + Δf ２ (i), B2] is the adjusted frequency, and Δf ２ (i) is the difference between the unadjusted frequency f'(i) that was to be transmitted in the i-th time unit and the frequency f(i-1) of the filtered sixth signal transmitted in the (i-1)-th time unit, B2 is a pre-set second bandwidth value, and i is an integer greater than 1. The frequency f(i) of the filtered sixth signal transmitted in the i-th time unit is restored to the frequency f'(i) before adjustment, and the frequency difference between the f'(i) before adjustment and the frequency f(i-1) of the filtered sixth signal transmitted in the (i-1)-th time unit is determined. Based on the frequency difference of the filtered sixth signal, the modulation information carried by the filtered sixth signal is acquired. It is particularly structured as follows: The communication device according to claim 15.

19. A communication method applicable to a communication device, The communication device includes a first branch and a second branch, the first branch includes a first frequency-amplitude converter, the second branch includes a second frequency-amplitude converter, and the second frequency range in which the frequency-amplitude conversion by the second frequency-amplitude converter is linear is smaller than the first frequency range in which the frequency-amplitude conversion by the first frequency-amplitude converter is linear. The aforementioned communication method is, The receiving of a first signal and a second signal, wherein both the second signal and the first signal are from the same device, and the second signal instructs the communication device to enter a connected state, The first amplitude information of the third signal is obtained by using the first frequency-amplitude converter, the third signal is a signal obtained by performing frequency mixing on the first signal and the first local oscillator signal, and the first local oscillator signal is a local oscillator signal generated by the communication device, the acquisition and The second branch demodulates the fourth signal, the fourth signal being obtained by performing frequency mixing on the second signal and the second local oscillator signal, and the second local oscillator signal being obtained by performing frequency offset correction on the first local oscillator signal based on the first amplitude information, and the demodulation A communication method that includes [something].

20. Before demodulating the fourth signal with the second branch, the communication method Based on the first amplitude information, a first frequency offset value is obtained, A frequency offset correction is performed on the first local oscillator signal based on the first frequency offset value to obtain the second local oscillator signal. It further has, The communication method according to claim 19.

21. The first frequency-amplitude converter includes a first phase shift unit, which introduces different phase shifts to signals of different frequencies based on a first frequency-amplitude curve. The second frequency-amplitude converter includes a second phase shift unit, which introduces different phase shifts to signals of different frequencies based on a second frequency-amplitude curve, wherein the slope of the second frequency-amplitude curve in the second frequency range is greater than the slope of the first frequency-amplitude curve in the first frequency range. The first frequency-amplitude curve and the second frequency-amplitude curve are represented in a graph with frequency on the horizontal axis and amplitude on the vertical axis. The communication method according to claim 19.

22. A differential frequency modulation scheme is used for the second signal. The aforementioned communication method is, The method further includes obtaining the third amplitude information of the fourth signal by using the second frequency-amplitude converter. Demodulating the fourth signal using the second branch means The second branch obtains the frequency difference of the fourth signal transmitted in adjacent time units based on the third amplitude information, and when the frequency f(i) of the fourth signal transmitted in the i-th time unit in the sequence of the fourth signal is smaller than the frequency f(i-1) of the fourth signal transmitted in the (i-1)-th time unit in the sequence of the fourth signal, The frequency f(i) of the fourth signal transmitted in the i-th time unit is given by f(i) = mod[f(i-1) + Δf １ (i), B1] is the adjusted frequency, and Δf １ (i) is the difference between the pre-adjusted frequency f'(i) that was to be transmitted in the i-th time unit and the frequency f(i-1) of the fourth signal transmitted in the (i-1)-th time unit, B1 is a pre-set first bandwidth value, and i is an integer greater than 1. The frequency f(i) of the fourth signal transmitted in the i-th time unit is restored to the frequency f'(i) before adjustment, and the frequency difference between the f'(i) before adjustment and the frequency f(i-1) of the fourth signal transmitted in the (i-1)-th time unit is determined. Based on the frequency difference of the fourth signal, the modulation information carried by the fourth signal is obtained. Having, The communication method according to claim 19.

23. A differential frequency modulation scheme is used for the first signal, and the communication method is The first branch obtains the frequency difference of the third signal transmitted in adjacent time units based on the first amplitude information, and when the frequency f(j) of the third signal transmitted in the j-th time unit in the sequence of the third signal is smaller than the frequency f(j-1) of the third signal transmitted in the (j-1)-th time unit in the sequence of the third signal, The frequency f(j) of the third signal transmitted in the j-th time unit is given by f(j) = mod[f(j-1) + Δf １ (j), B3] is the adjusted frequency, and Δf １ (j) is the difference between the pre-adjusted frequency f'(j) that was to be transmitted in the j-th time unit and the frequency f(j-1) of the third signal transmitted in the (j-1)-th time unit, B3 is a pre-set third bandwidth value, and j is an integer greater than 1. The frequency f(j) of the third signal transmitted in the j-th time unit is restored to the frequency f'(j) before adjustment, and the frequency difference between the f'(j) before adjustment and the frequency f(j-1) of the third signal transmitted in the (j-1)-th time unit is determined. Based on the frequency difference of the third signal, the modulation information carried by the third signal is obtained. It further has, The communication method according to claim 19.

24. A communication method applicable to a communication device, The communication device includes a first branch and a second branch, the first branch includes a first frequency-amplitude converter, the second branch includes a second frequency-amplitude converter, and the second frequency range in which the frequency-amplitude conversion by the second frequency-amplitude converter is linear is smaller than the first frequency range in which the frequency-amplitude conversion by the first frequency-amplitude converter is linear. The aforementioned communication method is, The receiving of a second signal, the receiving of which the second signal instructs the communication device to enter a connected state, The acquisition of the second amplitude information of the fifth signal is performed by using the first frequency-amplitude converter, the fifth signal is a signal obtained by performing frequency mixing on the second signal and the first local oscillator signal, and the first local oscillator signal is a local oscillator signal generated by the communication device, and the acquisition is performed. The second branch demodulates the sixth signal, the sixth signal being obtained by performing frequency mixing on the second signal and the second local oscillator signal, the second local oscillator signal being obtained by performing frequency offset correction on the first local oscillator signal based on the second amplitude information, and the demodulation A communication method that includes [something].

25. Before demodulating the sixth signal with the second branch, the communication method Based on the second amplitude information, a second frequency offset value is obtained, The second local oscillator signal is obtained by performing frequency offset correction on the first local oscillator signal based on the second frequency offset value. It further has, The communication method according to claim 24.

26. The first frequency-amplitude converter includes a first phase shift unit, which introduces different phase shifts to signals of different frequencies based on a first frequency-amplitude curve. The second frequency-amplitude converter includes a second phase shift unit, which introduces different phase shifts to signals of different frequencies based on a second frequency-amplitude curve, wherein the slope of the second frequency-amplitude curve in the second frequency range is greater than the slope of the first frequency-amplitude curve in the first frequency range. The first frequency-amplitude curve and the second frequency-amplitude curve are represented in a graph with frequency on the horizontal axis and amplitude on the vertical axis. The communication method according to claim 24.

27. A differential frequency modulation scheme is used for the second signal, and the sixth signal is demodulated by the second branch. The second branch obtains the frequency difference of filtered sixth signals transmitted in adjacent time units, and when the frequency f(i) of the filtered sixth signal transmitted in the i-th time unit in the sequence of filtered sixth signals is smaller than the frequency f(i-1) of the filtered sixth signal transmitted in the (i-1)-th time unit in the sequence of filtered sixth signals, The frequency f(i) of the filtered sixth signal transmitted in the i-th time unit is given by f(i) = mod[f(i-1) + Δf ２ (i), B2] is the adjusted frequency, and Δf ２ (i) is the difference between the unadjusted frequency f'(i) that was to be transmitted in the i-th time unit and the frequency f(i-1) of the filtered sixth signal transmitted in the (i-1)-th time unit, B2 is a pre-set second bandwidth value, and i is an integer greater than 1. The frequency f(i) of the filtered sixth signal transmitted in the i-th time unit is restored to the frequency f'(i) before adjustment, and the frequency difference between the f'(i) before adjustment and the frequency f(i-1) of the filtered sixth signal transmitted in the (i-1)-th time unit is determined. Based on the frequency difference of the filtered sixth signal, the modulation information carried by the filtered sixth signal is obtained. Having, The communication method according to claim 24.

28. A communication method applicable to a communication device, The communication device includes a first branch and a second branch, the first branch includes a first filter, the second branch includes a second filter, and the bandwidth of the second filter is narrower than the bandwidth of the first filter. The aforementioned communication method is, The receiving of a first signal and a second signal, wherein both the second signal and the first signal are from the same device, and the second signal instructs the communication device to enter a connected state, The third signal is filtered by using the first filter, the third signal is a signal obtained by performing frequency mixing on the first signal and the first local oscillator signal, and the first local oscillator signal is a local oscillator signal generated by the communication device, the third signal is filtered, The fourth signal is filtered by using the second filter, the fourth signal is a signal obtained by performing frequency mixing on the second signal and the second local oscillator signal, the second local oscillator signal is a signal obtained by performing frequency offset correction on the first local oscillator signal based on the first amplitude information of the third signal, and the fourth signal is filtered. It has, The first branch further includes a first frequency-amplitude converter, the first amplitude information is obtained by using the first frequency-amplitude converter, the second branch further includes a second frequency-amplitude converter, the second frequency range in which the frequency-amplitude conversion by the second frequency-amplitude converter is linear is smaller than the first frequency range in which the frequency-amplitude conversion by the first frequency-amplitude converter is linear, and the communication method is By using the second frequency-amplitude converter, the third amplitude information of the fourth signal is obtained, Based on the third amplitude information of the fourth signal, the filtered fourth signal is demodulated. A communication method that further includes the following.

29. The communication method is: Based on the first amplitude information, a first frequency offset value is obtained, A frequency offset correction is performed on the first local oscillator signal based on the first frequency offset value to obtain the second local oscillator signal. It further has, The communication method according to claim 28.

30. The first frequency-amplitude converter includes a first phase shift unit, which introduces different phase shifts to signals of different frequencies based on a first frequency-amplitude curve. The second frequency-amplitude converter includes a second phase shift unit, which introduces different phase shifts to signals of different frequencies based on a second frequency-amplitude curve, wherein the slope of the second frequency-amplitude curve in the second frequency range is greater than the slope of the first frequency-amplitude curve in the first frequency range. The first frequency-amplitude curve and the second frequency-amplitude curve are represented in a graph with frequency on the horizontal axis and amplitude on the vertical axis. The communication method according to claim 28.

31. A differential frequency modulation scheme is used for the second signal, and the filtered fourth signal is demodulated based on the third amplitude information of the fourth signal. The second branch obtains the frequency difference of the fourth signal transmitted in adjacent time units based on the third amplitude information of the fourth signal, and when the frequency f(i) of the fourth signal transmitted in the i-th time unit in the sequence of the fourth signal is smaller than the frequency f(i-1) of the fourth signal transmitted in the (i-1)-th time unit in the sequence of the fourth signal, The frequency f(i) of the fourth signal transmitted in the i-th time unit is given by f(i) = mod[f(i-1) + Δf １ (i), B1] is the adjusted frequency, and Δf １ (i) is the difference between the pre-adjusted frequency f'(i) that was to be transmitted in the i-th time unit and the frequency f(i-1) of the fourth signal transmitted in the (i-1)-th time unit, B1 is a pre-set first bandwidth value, and i is an integer greater than 1. The frequency f(i) of the fourth signal transmitted in the i-th time unit is restored to the frequency f'(i) before adjustment, and the frequency difference between the f'(i) before adjustment and the frequency f(i-1) of the fourth signal transmitted in the (i-1)-th time unit is determined. Based on the frequency difference of the filtered fourth signal, the modulation information carried by the filtered fourth signal is obtained. Having, The communication method according to claim 28.

32. A differential frequency modulation scheme is used for the first signal, and the communication method is The first branch obtains the frequency difference of the third signal transmitted in adjacent time units based on the first amplitude information, and when the frequency f(j) of the third signal transmitted in the j-th time unit in the sequence of the third signal is smaller than the frequency f(j-1) of the third signal transmitted in the (j-1)-th time unit in the sequence of the third signal, The frequency f(j) of the third signal transmitted in the j-th time unit is given by f(j) = mod[f(j-1) + Δf １ (j), B3] is the adjusted frequency, and Δf １ (j) is the difference between the pre-adjusted frequency f'(j) that was to be transmitted in the j-th time unit and the frequency f(j-1) of the third signal transmitted in the (j-1)-th time unit, B3 is a pre-set third bandwidth value, and j is an integer greater than 1. The frequency f(j) of the third signal transmitted in the j-th time unit is restored to the frequency f'(j) before adjustment, and the frequency difference between the f'(j) before adjustment and the frequency f(j-1) of the third signal transmitted in the (j-1)-th time unit is determined. Based on the frequency difference of the third signal, the modulation information carried by the third signal is obtained. It further has, The communication method according to claim 28.

33. A communication method applicable to a communication device, The communication device includes a first branch and a second branch, the first branch includes a first filter, the second branch includes a second filter, and the bandwidth of the second filter is narrower than the bandwidth of the first filter. The aforementioned communication method is, The receiving of a second signal, the receiving of which the second signal instructs the communication device to enter a connected state, The fifth signal is filtered by using the first filter, the fifth signal is a signal obtained by performing frequency mixing on the second signal and the first local oscillator signal, and the first local oscillator signal is a local oscillator signal generated by the communication device, the fifth signal is filtered, The sixth signal is filtered by using the second filter, the sixth signal is a signal obtained by performing frequency mixing on the second signal and the second local oscillator signal, the second local oscillator signal is a signal obtained by performing frequency offset correction on the first local oscillator signal based on the second amplitude information of the fifth signal, and the sixth signal is filtered. It has, The first branch further includes a first frequency-amplitude converter, the second amplitude information is obtained by using the first frequency-amplitude converter, the second branch further includes a second frequency-amplitude converter, the second frequency range in which the frequency-amplitude conversion by the second frequency-amplitude converter is linear is smaller than the first frequency range in which the frequency-amplitude conversion by the first frequency-amplitude converter is linear, and the communication method is A communication method further comprising demodulating a filtered sixth signal.

34. The communication method is: Based on the second amplitude information, a second frequency offset value is obtained, The second local oscillator signal is obtained by performing frequency offset correction on the first local oscillator signal based on the second frequency offset value. It further has, The communication method according to claim 33.

35. The first frequency-amplitude converter includes a first phase shift unit, which introduces different phase shifts to signals of different frequencies based on a first frequency-amplitude curve. The second frequency-amplitude converter includes a second phase shift unit, which introduces different phase shifts to signals of different frequencies based on a second frequency-amplitude curve, wherein the slope of the second frequency-amplitude curve in the second frequency range is greater than the slope of the first frequency-amplitude curve in the first frequency range. The first frequency-amplitude curve and the second frequency-amplitude curve are represented in a graph with frequency on the horizontal axis and amplitude on the vertical axis. The communication method according to claim 33.

36. A differential frequency modulation scheme is used for the second signal, and the filtered sixth signal is demodulated. The second branch obtains the frequency difference of the filtered sixth signal transmitted in adjacent time units, and when the frequency f(i) of the filtered sixth signal transmitted in the i-th time unit in the sequence of the filtered sixth signal is smaller than the frequency f(i-1) of the filtered sixth signal transmitted in the (i-1)-th time unit in the sequence of the filtered sixth signal, The frequency f(i) of the filtered sixth signal transmitted in the i-th time unit is given by f(i) = mod[f(i-1) + Δf ２ (i), B2] is the adjusted frequency, and Δf ２ (i) is the difference between the unadjusted frequency f'(i) that was to be transmitted in the i-th time unit and the frequency f(i-1) of the filtered sixth signal transmitted in the (i-1)-th time unit, B2 is a pre-set second bandwidth value, and i is an integer greater than 1. The frequency f(i) of the filtered sixth signal transmitted in the i-th time unit is restored to the frequency f'(i) before adjustment, and the frequency difference between the f'(i) before adjustment and the frequency f(i-1) of the filtered sixth signal transmitted in the (i-1)-th time unit is determined. Based on the frequency difference of the filtered sixth signal, the modulation information carried by the filtered sixth signal is obtained. Having, The communication method according to claim 33.

37. A communication device, One or more processors, One or more memory devices, Having one or more computer programs, The one or more computer programs are stored in the one or more memory locations, and the one or more computer programs include instructions. When the instruction is executed by one or more processors, it causes the one or more processors to execute the communication method described in any one of claims 19 to 36. Communication device.

38. Having computer instructions, When the computer instruction is executed by the communication device, it causes the communication device to execute the communication method described in any one of claims 19 to 36. Computer-readable storage medium.

39. It has at least one processor and interface circuit, The interface circuit is configured to supply program instructions to the at least one processor, When the program instruction is executed by the at least one processor, it causes the at least one processor to execute the communication method described in any one of claims 19 to 36. Tip.

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