Signal transmission method, signal reception method, and communication device

Abstract

The present application discloses a signal transmission method, a signal receiving method, and a communication apparatus. The method includes a first device transmitting a first signal to a second device for a first frequency domain unit and transmitting a second signal for a second frequency domain unit. The first frequency domain unit includes a first frequency, and the second frequency unit includes a second frequency. The absolute value of the difference between the first frequency and the second frequency is associated with one or more of the following: a first bandwidth, a second bandwidth, or a third bandwidth. The first bandwidth is a bandwidth occupied by the first frequency domain unit in the frequency domain. The second bandwidth is a bandwidth occupied by the second frequency domain unit in the frequency domain. The third bandwidth is a bandwidth occupied by the third frequency domain unit in the frequency domain. The third frequency domain unit is used by the first device to transmit a third signal to a third device. The first signal, the second signal, and the third signal are in one operating band. In this way, interference can be suppressed without increasing the complexity of the radio frequency filters.

Description

[Technical field]

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS This application claims priority to Chinese Patent Application No. 202210351628.0, entitled “SIGNAL SENDING METHOD, SIGNAL RECEIVING METHOD, AND COMMUNICATION APPARATUS,” filed with the State Intellectual Property Office of the People's Republic of China on April 2, 2022, the entire contents of which are incorporated herein by reference.

[0002] The present application relates to the field of radio frequency technology, in particular to a signal transmitting method, a signal receiving method, and a communication device. [Background technology]

[0003] In order to further reduce the power consumption of the receiver, the received signal can be processed by amplitude modulation and envelope detection to avoid using a high-power radio frequency module. However, because the envelope detection is a nonlinear component and has a large noise, in order to correctly demodulate the received signal, a radio frequency amplifier needs to be placed in front of the envelope detector. The receiver also needs to filter the received signal. Therefore, in order to achieve a good filter effect, a radio frequency filter needs to be placed in front of the radio frequency amplifier, and the Q value of the radio frequency filter is required to be high. However, the Q value of the on-chip radio frequency filter is usually low. If the Q value of the on-chip radio frequency filter is expected to be high, a bulk acoustic wave (BAW) or a surface acoustic wave (SAW) needs to be externally connected. It is obvious that the integration level of the receiver is low and the requirement of a small receiver size cannot be met. Summary of the Invention

[0004] The present application provides a signal transmission method, a signal receiving method, and a communication device for reducing interference between signals without increasing the complexity of a radio frequency filter in a receiver. [Means for solving the problem]

[0005] According to a first aspect, an embodiment of the present application provides a signal transmission method. The method may be executed by a first communication device. The first communication device may be a communication device or a communication apparatus, for example, a chip system that can support the communication device in implementing the functions required in the method. In the following, a description is provided by using an example in which the communication device is the first device. For example, the first communication device is a first device, a chip disposed in the first device, or another component configured to implement the functions of the first device. The method includes: the first device determines a first signal and a second signal, transmits the first signal to the second device for a first frequency domain unit, and transmits the second signal to the second frequency domain unit. The first frequency domain unit includes a first frequency, and the second frequency unit includes a second frequency. The absolute value of the difference between the first frequency and the second frequency is associated with one or more of the following: a first bandwidth, a second bandwidth, or a third bandwidth. The first bandwidth is a bandwidth occupied by a first frequency domain unit in the frequency domain. The second bandwidth is a bandwidth occupied by a second frequency domain unit in the frequency domain. The third bandwidth is a bandwidth occupied by a third frequency domain unit in the frequency domain. The third frequency domain unit is used by the first device to transmit a third signal to a third device. The first signal, the second signal, and the third signal are in one operating band.

[0006] In this embodiment of the present application, the first device used as a transmitting end device can transmit two signals (e.g., a first signal and a second signal) at two frequency positions (e.g., a first frequency and a second frequency). For example, the first device can transmit a first signal at a first frequency position and a second signal at a second frequency position. For the second device used as a receiving end, the radio frequency filter of the second device needs to allow the first signal and the second signal to pass, in other words, the pass band of the radio frequency filter needs to encompass the first frequency and the second frequency. It will be understood that a larger interval between the first frequency and the second frequency dictates a lower requirement for the Q value of the radio frequency filter of the second device, in other words, a radio frequency filter with a higher Q value is not required. Therefore, according to the method in this embodiment of the present application, the complexity of the design and implementation of the radio frequency filter cannot be increased. In addition, considering the existence of the interference signal, the second device can receive the first signal and the second signal by envelope detection. After the envelope detection is performed, the mid-frequency component corresponding to the absolute value of the difference between the first frequency and the second frequency is the signal that the second device needs to acquire, and may also be called the target signal. In this case, the second device can acquire the target signal by using an intermediate frequency bandpass filter to suppress another frequency component containing the interference. It can be understood that the frequency of the mid-frequency is lower than that of the radio frequency, and the mid-frequency filter is easier to design and implement under the same Q factor requirement. Therefore, according to the solution in the embodiment of the present application, after the envelope detection is performed, the second device can easily distinguish the target signal from the interference by using the mid-frequency filter, and the complexity of the design and implementation of the radio frequency filter is not increased.

[0007] In a possible embodiment, the first device transmits the first signal and the second signal within a frequency range corresponding to the channel bandwidth of the second device, and the absolute value of the difference between the first frequency and the second frequency is equal to or greater than 1 / 2 of the channel bandwidth of the second device. According to this solution, the frequency of the mid-frequency component (i.e., the target signal) obtained by the second device by receiving the first signal and the second signal by envelope detection is different from the frequency of the interference signal. In other words, since the target signal and the interference signal do not overlap in the spectrum, the interference signal can be easily filtered out by using a mid-frequency filter. The requirements for the radio frequency filter are low, and the complexity of the design and implementation of the radio frequency filter does not need to be increased.

[0008] In a possible embodiment, the absolute value of the difference between the first frequency and the second frequency is equal to or greater than the sum of the third bandwidth and the fourth bandwidth. The fourth bandwidth is twice the sum of the first bandwidth and the second bandwidth, and the third signal falls between the first frequency and the second frequency in the frequency domain. It can be understood that a larger difference between the first frequency and the second frequency indicates a larger difference between the frequency of the target signal and the frequency of the interference signal. According to this solution, since the difference between the frequency of the target signal and the frequency of the interference signal is large, it is easy to distinguish the interference signal from the target signal, and it is easy to filter out the interference signal by using a mid-frequency filter. Therefore, the requirements for the radio frequency filter are relatively low, and the complexity of the design and implementation of the radio frequency filter does not need to be increased.

[0009] In a possible embodiment, the absolute value of the difference between the first frequency and the second frequency is a preset value. For example, the preset value is associated with one or more of an operating band, a subcarrier spacing of the first signal, or a subcarrier spacing of the second signal. The operating band is an operating band used for communication between the first device and the second device. Since the absolute value of the difference between the first frequency and the second frequency is a preset value, the method is applicable to a scenario in which the first device does not need to inform the second device of the absolute value of the difference between the first frequency and the second frequency. For example, after the first device establishes a communication connection to the second device, the first device transmits a first signaling between the first device and the second device by using the first frequency and the second frequency to the second device.

[0010] In a possible embodiment, the method further includes the first device transmitting first indication information to the second device. The first indication information indicates an absolute value of a difference between the first frequency and the second frequency. The first device may inform the second device of the absolute value of the difference between the first frequency and the second frequency, which is flexible.

[0011] In a possible embodiment, at most one of the first signal and the second signal is used to provide a carrier for the uplink transmission of the second device. One signal is used to provide a carrier for the transmission. The signal can also be considered to be used for backscatter communication and can be called a carrier signal. Compared to the carrier signal, the data signal is a signal that carries modulated information. Both the first signal and the second signal may be data signals; or the first signal is a data signal and the second signal is a carrier signal. It will be understood that if the first signal is a data signal and the second signal is a carrier signal, the resource overhead of the first device can be reduced. If both the first signal and the second signal are data signals, the reliability of the data transmission can be improved.

[0012] In a possible implementation, the power of the first signal is the same as the power of the second signal. Alternatively, the power of the first signal may be different from the power of the second signal. For example, the power of the first signal may be the same as the power of the second signal, and neither the first signal nor the second signal may be a carrier signal, in other words, both the first signal and the second signal are data signals. In another example, the power of the first signal is greater than the power of the second signal, and the first signal is a data signal and the second signal is a carrier signal. Since the data signal carries useful information, the reliability of the data transmission can be ensured by using a high power. In comparison, since the second signal is a carrier information and does not carry useful information, the power consumption of the first device can be reduced by using a low power. For example, neither the first signal nor the second signal is used to provide a carrier for the uplink transmission of the second device, and the power of the first signal may be the same as the power of the second signal. In another example, one of the first signal and the second signal provides a carrier for an uplink transmission of a second device, and the power of the first signal may be different from the power of the second signal, thereby ensuring reliability of the data transmission and reducing power consumption of the first device.

[0013] In a possible embodiment, at least one of the first signal and the second signal is in a guard band of one first carrier, and / or the absolute value of the difference between the first frequency and the second frequency is equal to or greater than the transmission bandwidth of one first carrier. The first carrier is a new radio (NR) carrier or a long term evolution (LTE) carrier. When both the operating band of the first device and the operating band of the second device are in the NR operating band, the impact on the transmission band of the NR carrier can be reduced because at least one of the first signal and the second signal is in the guard band of the NR carrier.

[0014] In a possible embodiment, both the first signal and the second signal are in the transmission bandwidth of the second carrier, the difference between the minimum value of the first frequency domain unit and the lowest frequency of the transmission bandwidth is less than or equal to a first value, and the difference between the maximum value of the second frequency domain unit and the highest frequency of the transmission bandwidth is less than or equal to a second value. The first value may be 0, and the second value may also be 0. When the first signal and the second signal are in the transmission bandwidth of the NR carrier, in order to ensure the anti-interference performance of the first signal and the second signal as much as possible, the operating band of the first signal (i.e., the first frequency domain unit) and the operating band of the second signal (i.e., the second frequency domain unit) may be at the two ends of the transmission bandwidth of the NR carrier, respectively.

[0015] In a possible embodiment, the method further includes the first device transmitting second instruction information to the second device. The second instruction information instructs the second device to receive a signal in the first receiving manner or the second receiving manner. The first receiving manner instructs the second device to receive a signal based on the absolute value of the difference between the first frequency and the second frequency. The second receiving manner instructs the second device to receive a signal based on the frequency of the DC carrier and the absolute value of the difference between the first frequency and the second frequency. It is understood that the first device transmits the first signal and the second signal. For the second device, when there is an interference signal, the second device can receive a signal at a frequency position corresponding to the absolute value of the difference between the first frequency and the second frequency. When there is no interference signal, in addition to receiving a signal at a frequency position corresponding to the absolute value of the difference between the first frequency and the second frequency, the second device can further receive a low-frequency signal near the DC carrier. Therefore, the first device can inform the second device of the signal reception method so as to ensure the reception performance of the second device as much as possible.

[0016] In possible implementations, the shift keying scheme of the first signal and / or the shift keying scheme of the second signal may be on-off shift keying (OOK), multicarrier on-off keying (MC-OOK), double-sideband amplitude-shift keying (DSB-ASK), single-sideband amplitude-shift keying (SSB-ASK), phase-reversal amplitude shift keying (PR-ASK), multiple amplitude-shift keying (MASK), frequency-shift keying (FSK), Gaussian frequency-shift keying (GFSK), multiple frequency-shift keying (MFSK), binary phase shift keying (BPSK), quadrature phase shift keying (QPSK), or a combination of these. modulation (PPM), pulse density modulation (PDM), or pulse code modulation (PCM).

[0017] In a possible embodiment, the modulation format of the first signal is the same as the modulation format of the second signal.

[0018] In a possible embodiment, the modulation format of the first signal is different from the modulation format of the second signal.

[0019] In possible implementations, the first signal or the second signal is a single-carrier signal; or the first signal or the second signal occupies one subcarrier in the frequency domain; or the first signal or the second signal is a signal that includes one subcarrier carrying energy.

[0020] In possible implementations, the first signal and / or the second signal are multi-carrier signals; or the first signal and / or the second signal occupy multiple sub-carriers in the frequency domain; or the first signal and / or the second signal are multiple signals or a signal comprising multiple sub-carriers carrying energy.

[0021] In a possible embodiment, the antenna port of the first signal is the same as the antenna port of the second signal.

[0022] In a possible embodiment, the cyclic prefix length of the first signal is the same as the cyclic prefix length of the second signal.

[0023] In a possible embodiment, the subcarrier spacing of the first signal is the same as the subcarrier spacing of the second signal.

[0024] In a possible implementation, the waveform of the first signal and / or the waveform of the second signal is orthogonal frequency division multiplexing (OFDM) with a cyclic prefix (CP).

[0025] In a possible implementation, the first signal waveform and / or the second signal waveform is OFDM with CP and discrete fourier transform (DFT) spreading is performed.

[0026] According to a second aspect, an embodiment of the present application provides a signal reception method. The method may be performed by a second communication apparatus. The second communication apparatus may be a communication device or a communication apparatus, for example, a chip system, which can support the communication device in implementing the functions required in the method. In the following, an explanation is provided by using an example in which the communication device is the second device. For example, the second communication apparatus is the second device, a chip disposed in the second device, or another component configured to implement the functions of the second device. The method includes:

[0027] The second device receives the first signal and the second signal by envelope detection to obtain the target signal. The first signal and the second signal are in an operating band. The frequency carrying the target signal includes an absolute value of the difference between the first frequency carrying the first signal and the second frequency carrying the second signal.

[0028] In a possible embodiment, the frequency carrying the target signal further comprises the frequency of a DC carrier wave.

[0029] In a possible embodiment, before the second device acquires the target signal, the method further comprises: determining a receiving scheme to be used by the second device to acquire the target signal. The receiving scheme comprises a first receiving scheme or a second receiving scheme. The first receiving scheme dictates receiving a signal based on an absolute value of a difference between a first frequency and a second frequency. The second receiving scheme dictates receiving a signal based on a frequency of a DC carrier wave and an absolute value of a difference between the first frequency and a second frequency.

[0030] In a possible embodiment, the second device determining the first receiving scheme or the second receiving scheme includes: the second device receiving second instruction information transmitted by the first device, the second instruction information instructing the first receiving scheme or the second receiving scheme.

[0031] In a possible implementation, the absolute value of the difference between the first and second frequencies is associated with one or more of the following: a first bandwidth, a second bandwidth, or a third bandwidth. The first bandwidth is a bandwidth occupied in the frequency domain by a first frequency domain unit, the first frequency domain unit encompassing the first frequency. The second bandwidth is a bandwidth occupied in the frequency domain by a second frequency domain unit, the second frequency domain unit encompassing the second frequency. The third bandwidth is a bandwidth occupied in the frequency domain by a third frequency domain unit, the third frequency domain unit being used by the first device to transmit a third signal to a third device, the third signal being in the operating band.

[0032] In a possible embodiment, the first signal and the second signal are transmitted within a frequency range corresponding to a channel bandwidth of the second device, and an absolute value of the difference between the first frequency and the second frequency is equal to or greater than half the channel bandwidth of the second device.

[0033] In a possible embodiment, the absolute value of the difference between the first frequency and the second frequency is equal to or greater than the sum of the third bandwidth and the fourth bandwidth. The fourth bandwidth is twice the sum of the first bandwidth and the second bandwidth. The third signal falls between the first frequency and the second frequency in the frequency domain.

[0034] In a possible implementation, the absolute value of the difference between the first frequency and the second frequency is a preset value, the preset value being associated with one or more of the operating band, the subcarrier spacing of the first signal, or the subcarrier spacing of the second signal.

[0035] In a possible embodiment, the method further comprises: the second device receiving first indication information transmitted by the first device, The first indication information indicates an absolute value.

[0036] In a possible implementation, at most one of the first signal and the second signal is used to provide a carrier for an uplink transmission of the second device.

[0037] In a possible embodiment, the power of the first signal is the same as the power of the second signal.

[0038] In a possible implementation, the power of the first signal is the same as the power of the second signal, and neither the first signal nor the second signal is used to provide a carrier for uplink transmissions of the second device.

[0039] In a possible embodiment, at least one of the first signal and the second signal is in a guard band of one first carrier and / or the absolute value of the difference between the first frequency and the second frequency is equal to or greater than the transmission bandwidth of one first carrier, the first carrier being a new radio NR carrier or an LTE carrier.

[0040] In a possible implementation, both the first signal and the second signal are in the transmission bandwidth of the second carrier, the difference between the minimum value of the first frequency unit and the lowest frequency of the transmission bandwidth is less than a first value, and the difference between the maximum value of the second frequency domain unit and the highest frequency of the transmission bandwidth is less than a second value.

[0041] In a possible embodiment, the modulation format of the first signal and / or the modulation format of the second signal is OOK, MC-OOK, DSB-ASK, SSB-ASK, PR-ASK, MASK, FSK, GFSK, MFSK, BPSK, QPSK, PAM, PWM, PPM, PDM, or PCM.

[0042] In a possible embodiment, the modulation format of the first signal is the same as the modulation format of the second signal.

[0043] In a possible embodiment, the modulation format of the first signal is different from the modulation format of the second signal.

[0044] In possible implementations, the first signal or the second signal is a single-carrier signal; or the first signal or the second signal occupies one subcarrier in the frequency domain; or the first signal or the second signal is a signal that includes one subcarrier carrying energy.

[0045] In possible implementations, the first signal and / or the second signal are multi-carrier signals; or the first signal and / or the second signal occupy multiple sub-carriers in the frequency domain; or the first signal and / or the second signal are multiple signals or a signal comprising multiple sub-carriers carrying energy.

[0046] In a possible embodiment, the antenna port of the first signal is the same as the antenna port of the second signal.

[0047] In a possible embodiment, the cyclic prefix length of the first signal is the same as the cyclic prefix length of the second signal.

[0048] In a possible embodiment, the subcarrier spacing of the first signal is the same as the subcarrier spacing of the second signal.

[0049] In a possible embodiment, the first signal waveform and / or the second signal waveform is OFDM with CP.

[0050] In a possible implementation, the first signal waveform and / or the second signal waveform is OFDM with CP and DFT spreading is performed.

[0051] For the technical effects provided by the second aspect and possible implementations of the second aspect, please refer to the description of the technical effects of the first aspect and implementations of the first aspect.

[0052] According to a third aspect, an embodiment of the present application provides a signal transmission method. The method may be performed by a first communication apparatus. The first communication apparatus may be a communication device or a communication apparatus, for example, a chip system that can support the communication device in implementing the functions required in the method. In the following, an explanation is provided by using an example in which the communication device is the first device. For example, the first communication apparatus is the first device, a chip disposed in the first device, or another component configured to implement the functions of the first device. The method includes:

[0053] The first device determines a first signal and a second signal, transmits the first signal to the second device to a first frequency domain unit, and transmits the second signal to a second frequency domain unit. The first signal and the second signal are in the same operating band. The first frequency domain unit includes a first frequency, and the second frequency domain unit includes a second frequency. The absolute value of the difference between the first frequency and the second frequency is a preset value. Alternatively, the first device further transmits the absolute value of the difference between the first frequency and the second frequency to the second device.

[0054] In one possible implementation, the first device transmitting the absolute value of the difference between the first frequency and the second frequency to the second device includes: the first device transmitting instruction information to the second device, the instruction information indicating the absolute value of the difference between the first frequency and the second frequency.

[0055] In a possible implementation, the absolute value of the difference between the first frequency and the second frequency is a preset value, the preset value being associated with one or more of the operating band, the subcarrier spacing of the first signal, or the subcarrier spacing of the second signal.

[0056] In a possible embodiment, the first signal and the second signal are transmitted within a frequency range corresponding to a channel bandwidth of the second device, and an absolute value of the difference between the first frequency and the second frequency is equal to or greater than half the channel bandwidth of the second device.

[0057] In a possible embodiment, the absolute value of the difference between the first frequency and the second frequency is equal to or greater than the sum of the third bandwidth and the fourth bandwidth. The fourth bandwidth is twice the sum of the first bandwidth and the second bandwidth. The third bandwidth is a bandwidth occupied by a third frequency domain unit in the frequency domain. The third frequency domain unit is used by the first device to transmit a third signal to a third device. The third signal falls between the first frequency and the second frequency in the frequency domain.

[0058] In a possible implementation, at most one of the first signal and the second signal is used to provide a carrier for an uplink transmission of the second device.

[0059] In a possible embodiment, the power of the first signal is the same as the power of the second signal.

[0060] In a possible implementation, the power of the first signal is the same as the power of the second signal, and neither the first signal nor the second signal is used to provide a carrier for uplink transmissions of the second device.

[0061] In a possible embodiment, at least one of the first signal and the second signal is in a guard band of one first carrier and / or the absolute value of the difference between the first frequency and the second frequency is equal to or greater than the transmission bandwidth of one first carrier, the first carrier being a new radio NR carrier or an LTE carrier.

[0062] In a possible implementation, both the first signal and the second signal are in the transmission bandwidth of the second carrier, the difference between the minimum value of the first frequency unit and the lowest frequency of the transmission bandwidth is less than a first value, and the difference between the maximum value of the second frequency domain unit and the highest frequency of the transmission bandwidth is less than a second value.

[0063] In a possible embodiment, the method further includes the first device transmitting second instruction information to the second device. The second instruction information instructs the second device to receive the signal in the first receiving manner or the second receiving manner. The first receiving manner instructs the second device to receive the signal based on an absolute value of a difference between the first frequency and the second frequency. The second receiving manner instructs the second device to receive the signal based on a frequency of a DC carrier wave and an absolute value of a difference between the first frequency and the second frequency.

[0064] According to a fourth aspect, an embodiment of the present application provides a signal reception method. The method may be performed by a second communication device. The second communication device may be a communication device or a communication apparatus, for example, a chip system, which can support the communication device in implementing the functions required in the method. In the following, an explanation is provided by using an example in which the communication device is the second device. For example, the second communication device is a first device, a chip disposed in the second device, or another component configured to implement the functions of the second device. The method includes:

[0065] The second device receives the first signal and the second signal by envelope detection. The first signal and the second signal are in one operating band. The second device acquires a target signal. The frequency carrying the target signal includes an absolute value of a difference between a first frequency carrying the first signal and a second frequency carrying the second signal. The absolute value of the difference between the first frequency and the second frequency is a preset value, or the absolute value of the difference between the first frequency and the second frequency is acquired from the first device.

[0066] In a possible embodiment, the method further comprises: the second device receiving first indication information transmitted by the first device, The first indication information indicates an absolute value.

[0067] In a possible embodiment, the frequency carrying the target signal further comprises the frequency of a DC carrier wave.

[0068] In a possible embodiment, before the second device acquires the target signal, the method further comprises: determining a receiving scheme to be used by the second device to acquire the target signal. The receiving scheme comprises a first receiving scheme or a second receiving scheme. The first receiving scheme dictates receiving a signal based on an absolute value of a difference between a first frequency and a second frequency. The second receiving scheme dictates receiving a signal based on a frequency of a DC carrier wave and an absolute value of a difference between the first frequency and a second frequency.

[0069] In a possible embodiment, the second device determining the first receiving scheme or the second receiving scheme includes: the second device receiving second instruction information transmitted by the first device, the second instruction information instructing the first receiving scheme or the second receiving scheme.

[0070] In a possible implementation, the absolute value of the difference between the first and second frequencies is associated with one or more of the following: a first bandwidth, a second bandwidth, or a third bandwidth. The first bandwidth is a bandwidth occupied in the frequency domain by a first frequency domain unit, the first frequency domain unit encompassing the first frequency. The second bandwidth is a bandwidth occupied in the frequency domain by a second frequency domain unit, the second frequency domain unit encompassing the second frequency. The third bandwidth is a bandwidth occupied in the frequency domain by a third frequency domain unit, the third frequency domain unit being used by the first device to transmit a third signal to a third device, the third signal being in the operating band.

[0071] In a possible embodiment, the first signal and the second signal are transmitted within a frequency range corresponding to a channel bandwidth of the second device, and an absolute value of the difference between the first frequency and the second frequency is equal to or greater than half the channel bandwidth of the second device.

[0072] In a possible embodiment, the absolute value of the difference between the first frequency and the second frequency is equal to or greater than the sum of the third bandwidth and the fourth bandwidth. The fourth bandwidth is twice the sum of the first bandwidth and the second bandwidth. The third signal falls between the first frequency and the second frequency in the frequency domain.

[0073] In a possible implementation, the absolute value of the difference between the first frequency and the second frequency is a preset value, the preset value being associated with one or more of the operating band, the subcarrier spacing of the first signal, or the subcarrier spacing of the second signal.

[0074] In a possible embodiment, the method further comprises: the second device receiving first indication information transmitted by the first device, The first indication information indicates an absolute value.

[0075] In a possible implementation, at most one of the first signal and the second signal is used to provide a carrier for an uplink transmission of the second device.

[0076] In a possible embodiment, the power of the first signal is the same as the power of the second signal.

[0077] In a possible implementation, the power of the first signal is the same as the power of the second signal, and neither the first signal nor the second signal is used to provide a carrier for uplink transmissions of the second device.

[0078] In a possible embodiment, at least one of the first signal and the second signal is in a guard band of one first carrier and / or the absolute value of the difference between the first frequency and the second frequency is equal to or greater than the transmission bandwidth of one first carrier, the first carrier being a new radio NR carrier or an LTE carrier.

[0079] In a possible implementation, both the first signal and the second signal are in the transmission bandwidth of the second carrier, the difference between the minimum value of the first frequency unit and the lowest frequency of the transmission bandwidth is less than a first value, and the difference between the maximum value of the second frequency domain unit and the highest frequency of the transmission bandwidth is less than a second value.

[0080] According to a fifth aspect, an embodiment of the present application provides a communication device. The communication device has a function of implementing the behavior in the method embodiment of the first aspect. For beneficial effects, please refer to the description of the first aspect. Details will not be repeated here. The communication device may be the first device of the first aspect, or the communication device may be an apparatus, such as a chip or a chip system, that can implement the method provided in the first aspect.

[0081] In a possible design, the communication device includes corresponding means or modules configured to perform the method according to the first aspect. For example, the communication device includes a processing unit (also referred to as a processing module or processor) and / or a transceiver unit (also referred to as a transceiver module or transceiver). These units (modules) may perform corresponding functions in the example method of the first aspect.

[0082] For example, the processing module may be configured to determine a first signal and a second signal. The transceiver module may be configured to transmit the first signal to the second device for a first frequency domain unit and transmit the second signal for a second frequency domain unit. The first frequency domain unit encompasses a first frequency and the second frequency unit encompasses a second frequency. An absolute value of the difference between the first frequency and the second frequency is associated with one or more of the following; a first bandwidth, a second bandwidth, or a third bandwidth. The first bandwidth is a bandwidth occupied by the first frequency domain unit in the frequency domain. The second bandwidth is a bandwidth occupied by the second frequency domain unit in the frequency domain. The third bandwidth is a bandwidth occupied by the third frequency domain unit in the frequency domain. The third frequency domain unit is used by the first device to transmit the third signal to the third device. The first signal, the second signal, and the third signal are in one operating band. For details, please refer to the detailed description of the method examples, which will not be described in detail herein.

[0083] According to a sixth aspect, an embodiment of the present application provides a communication device. The communication device has a function of implementing the behavior in the method embodiment of the second aspect. For beneficial effects, please refer to the description of the second aspect. Details will not be repeated here. The communication device may be the second device of the second aspect, or the communication device may be an apparatus, such as a chip or a chip system, that can implement the method provided in the second aspect.

[0084] In a possible design, the communication device includes corresponding means or modules configured to perform the method according to the second aspect. For example, the communication device includes a processing unit (also referred to as a processing module or processor) and / or a transceiver unit (also referred to as a transceiver module or transceiver). These units (modules) may perform corresponding functions in the example method of the second aspect.

[0085] For example, the transceiver module receives the first signal and the second signal by envelope detection, and the first signal and the second signal are in one operating band. The processing module is configured to obtain the target signal. The frequency carrying the target signal includes an absolute value of the difference between the first frequency carrying the first signal and the second frequency carrying the second signal. For details, please refer to the detailed description of the example method. Details will not be described in this specification.

[0086] According to a seventh aspect, an embodiment of the present application provides a communication device. The communication device has a function of implementing the behavior in the method embodiment of the third aspect. For beneficial effects, please refer to the description of the third aspect. Details will not be repeated here. The communication device may be the first device of the third aspect, or the communication device may be a device, such as a chip or a chip system, that can implement the method provided in the third aspect.

[0087] In a possible design, the communication device includes corresponding means or modules configured to perform the method according to the third aspect. For example, the communication device includes a processing unit (also referred to as a processing module or processor) and / or a transceiver unit (also referred to as a transceiver module or transceiver). These units (modules) may perform corresponding functions in the example method of the third aspect.

[0088] For example, the processing module may be configured to determine a first signal and a second signal. The transceiver module may be configured to transmit the first signal to the second device for a first frequency domain unit and transmit the second signal for a second frequency domain unit. The first frequency domain unit encompasses a first frequency and the second frequency unit encompasses a second frequency. An absolute value of the difference between the first frequency and the second frequency is associated with one or more of the following; a first bandwidth, a second bandwidth, or a third bandwidth. The first bandwidth is a bandwidth occupied by the first frequency domain unit in the frequency domain. The second bandwidth is a bandwidth occupied by the second frequency domain unit in the frequency domain. The third bandwidth is a bandwidth occupied by the third frequency domain unit in the frequency domain. The third frequency domain unit is used by the first device to transmit the third signal to the third device. The first signal, the second signal, and the third signal are in one operating band. For details, please refer to the detailed description of the method examples, which will not be described in detail herein.

[0089] According to an eighth aspect, an embodiment of the present application provides a communication device. The communication device has a function of implementing the behavior in the method embodiment of the fourth aspect. For beneficial effects, please refer to the description of the fourth aspect. Details will not be repeated here. The communication device may be the second device of the fourth aspect, or the communication device may be a device, such as a chip or a chip system, that can implement the method provided in the fourth aspect.

[0090] In a possible design, the communication device includes corresponding means or modules configured to perform the method according to the fourth aspect. For example, the communication device includes a processing unit (also referred to as a processing module or processor) and / or a transceiver unit (also referred to as a transceiver module or transceiver). These units (modules) may perform corresponding functions in the example method of the fourth aspect.

[0091] For example, the transceiver module receives the first signal and the second signal by envelope detection, and the first signal and the second signal are in one operating band. The processing module is configured to obtain the target signal. The frequency carrying the target signal includes an absolute value of the difference between the first frequency carrying the first signal and the second frequency carrying the second signal. For details, please refer to the detailed description of the example method. Details will not be described in this specification.

[0092] According to a ninth aspect, an embodiment of the present application provides a communication device. The communication device may be the communication device of any one of the first to fourth aspects in the aforementioned embodiments, or may be a chip or chip system arranged in the communication device of any one of the first to fourth aspects. The communication device includes a communication interface and a processor, and optionally further includes a memory. The memory is configured to store a computer program. The processor is coupled to the memory and the communication interface. When the processor reads the computer program or instruction, the communication device executes the method performed by the first device or the second device in the aforementioned method embodiment.

[0093] The communication interface in the communication device of the ninth aspect may be, for example, a transceiver in the communication device implemented by using an antenna, a feeder, a codec, etc. in the communication device. Alternatively, if the communication device is a chip disposed in the communication device, the communication interface may be an input / output interface of the chip, for example an input / output pin.

[0094] According to a tenth aspect, an embodiment of the present application provides a communication device. The communication device includes an input / output interface and a logic circuit. The input / output interface is configured to input and / or output information. The logic circuit is configured to perform a method according to any one of the first to fourth aspects.

[0095] According to an eleventh aspect, an embodiment of the present application provides a chip system. The chip system includes a processor, and may further include a memory and / or a communication interface, and is configured to implement a method according to any one of the first to fourth aspects. In a possible implementation, the chip system further includes a memory configured to store a computer program. The chip system may include a chip, or may include a chip and another discrete component.

[0096] According to a twelfth aspect, an embodiment of the present application provides a communication system. The communication system includes a first device and a second device. The first device is configured to execute the method performed by the first device of the first aspect, and the second device is configured to execute the method performed by the second device of the second aspect. Alternatively, the first device is configured to execute the method performed by the first device of the third aspect, and the second device is configured to execute the method performed by the second device of the fourth aspect. Alternatively, the communication system may further include more first devices and / or more second devices.

[0097] According to a thirteenth aspect, the present application provides a computer readable storage medium storing a computer program, which, when executed, implements a method according to any one of the first to fourth aspects.

[0098] According to a fourteenth aspect there is provided a computer program product comprising computer program code which, when executed, performs a method according to any one of the first to fourth aspects.

[0099] For the beneficial effects of the fifth to fourteenth aspects and their embodiments, please refer to the description of the beneficial effects of the methods according to the first to fourth aspects and their embodiments. [Brief description of the drawings]

[0100] [Figure 1] FIG. 1 is a diagram of a network architecture to which an embodiment of the present application is applicable. [Diagram 2] FIG. 1 is a diagram of a receiver configuration using an envelope detector. [Diagram 3] FIG. 2 is a schematic diagram of a circuit structure of an envelope detector. [Figure 4] FIG. 2 is a diagram of the spectrum of the input signal of the envelope detector in the absence of interference. [Diagram 5] FIG. 2 is a diagram of the spectrum of the output signal of the envelope detector in the absence of interference. [Figure 6] 1 is a diagram of the spectrum of the baseband signal after the envelope detector in the absence of interference; [Figure 7] 1 is a diagram of the spectrum of the input signal of the envelope detector in the presence of interference; [Figure 8] FIG. 13 is a diagram of the spectrum of the output signal of the envelope detector in the presence of interference. [Figure 9] 1 is a diagram of the spectrum of the baseband signal after the envelope detector in the presence of interference; [Figure 10] 1 is a diagram of a spectrum of an input signal of an envelope detector in the presence of interference according to an embodiment of the present application; [Figure 11] 4 is a diagram of a spectrum of an output signal of an envelope detector in the presence of interference according to an embodiment of the present application. [Figure 12] 1 is an illustration of a spectrum of a baseband signal after an envelope detector in the presence of interference, according to an embodiment of the present application. [Figure 13] A diagram showing the relationship between channel bandwidth, transmission band, and guard band. [Figure 14] 2 is a schematic flowchart of signal transmission and signal reception according to an embodiment of the present application; [Figure 15]2 is a diagram of frequency locations of a target signal and an interference signal according to an embodiment of the present application (the absolute value of the difference between the first frequency and the second frequency is equal to 1 / 2 of the carrier bandwidth); [Figure 16] 2 is a diagram of frequency locations of a target signal and an interference signal according to an embodiment of the present application, where the absolute value of the difference between the first frequency and the second frequency is greater than 1 / 2 of the carrier bandwidth; [Figure 17] 4 is a diagram of relative frequency positions of a first signal, a second signal, and a third signal according to an embodiment of the present application. [Figure 18] FIG. 2 is a diagram of the location of a first signal and a second signal on an NR carrier according to an embodiment of the present application. [Figure 19] FIG. 2 is another diagram of the location of the first signal and the second signal on the NR carrier according to an embodiment of the present application. [Figure 20] FIG. 11 is yet another diagram of the location of a first signal and a second signal on an NR carrier according to an embodiment of the present application. [Figure 21] FIG. 2 illustrates a diagram of transmitting a signal by a first device and receiving a signal by a second device according to an embodiment of the present application. [Figure 22] FIG. 2 is another diagram of transmitting a signal by a first device and receiving a signal by a second device according to an embodiment of the present application. [Diagram 23] 1 is a diagram of a structure of a communication device according to an embodiment of the present application; [Figure 24] FIG. 2 is a diagram of another structure of a communication device according to an embodiment of the present application. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0101] The technical solutions provided in the embodiments of the present application may be applied to a 5G mobile communication system, such as a NR system, or may be applied to a LTE system, and may further be applied to a next-generation mobile communication system or another similar communication system. The technical solutions provided in the embodiments of the present application may alternatively be applied to an Internet of Things (IoT) system, a narrowband Internet of Things (NB-IoT) system, etc., such as a wireless fidelity (WiFi)-based IoT or wearable WiFi network. The wearable WiFi network may be a WiFi network that includes an associated wearable device and a terminal device (e.g., a mobile phone) used as a virtual access point. The Internet of Things devices and wearable WiFi network devices are powered by a small-capacity battery and have the requirements of ultra-low power consumption and long battery endurance. The Internet of Things devices include, for example, smart water meters, smart homes, and industrial sensors.

[0102] FIG. 1 is a diagram of an exemplary architecture of a communication system to which an embodiment of the present application is applicable. The communication system can include a network device and six terminal devices. Each of the six terminal devices can be a mobile phone, a smartphone, a portable computer, a handheld communication device, a handheld computing device, a satellite radio, a global positioning system, a personal digital assistant (PDA), and / or any other suitable device configured to perform communication in a wireless communication system, and all can be connected to the network device. All six terminal devices can communicate with the network device. Of course, the number of terminal devices in FIG. 1 is only an example. There may be more terminal devices, fewer or more. The terminal devices in FIG. 1 are also an example. For example, the terminal devices may alternatively be Internet of Things devices, such as smart water meters.

[0103] In this embodiment of the present application, the network device is an access device used by a terminal device to access a mobile communication system in a wireless manner, and includes, for example, an access network (AN) device, such as a base station. Alternatively, the network device may be a device that communicates with a terminal device via an air interface. The network device may include an evolved Node B (also referred to as eNB or e-NodeB for short) in an LTE system or a long term evolution-advanced (LTE-A) system. The network device may alternatively include a next generation node B (gNB) in a 5G NR system. Alternatively, the network device may include an access node in a wireless-fidelity (Wi-Fi) system. Alternatively, the network device may be a relay station, an in-vehicle device, a future evolved Public Land Mobile Network (PLMN) device, a device in a D2D network, a device in a machine to machine (M2M) network, a device in an internet of things (IoT) network, a network device in a PLMN network, etc. The specific technology used by the network device and the specific device form are not limited in the embodiments of the present application.

[0104] In addition, the base station in the embodiment of the present application may include a centralized unit (CU) and a distributed unit (DU), and multiple DUs may be centrally controlled by one CU. The CU and the DU may be divided based on the protocol layer functions that the CU and the DU respectively have in the wireless network. For example, the packet data convergence protocol (PDCP) layer and the protocol layer functions above the packet data convergence protocol layer are configured in the CU, and the protocol layer functions below the PDCP, such as the radio link control (RLC) layer and the medium access control (MAC) layer, are configured in the DU. It should be noted that such a division of protocol layers is merely an example, and there may be other divisions of protocol layers. The radio frequency device may be remotely located and not located in the DU, or may be integrated in the DU, or may be partially remotely located and partially integrated in the DU. This is not limited in the embodiment of the present application. Furthermore, in some embodiments, the control plane (CP) and user plane (UP) of the CU may be separated for implementation and divided into different entities. The different entities are a control plane CU entity (CU-CP entity) and a user plane CU entity (CU-UP entity), respectively. In the network architecture, signaling generated by the CU may be transmitted to the terminal device via the DU, or signaling generated by the UE may be transmitted to the CU via the DU. The DU can transparently transmit the signaling to the UE or CU by directly encapsulating the signaling at the protocol layer without parsing the signaling. In this network architecture, the CU is classified as a network device on the radio access network (RAN) side.In addition, the CU may alternatively be classified as a network device on the core network (CN) side, which is not a limitation in this application.

[0105] Alternatively, the access network device may be a server, etc. For example, the network device in a vehicle to everything (V2X) technology may be a road side unit (RSU). In the following, an explanation is provided by using an example in which the access network device is a base station. The base station may communicate with a terminal device, or may communicate with the terminal device via a relay station. The terminal device may communicate with multiple base stations with different access technologies.

[0106] In an embodiment of the present application, a terminal device is a device having a wireless transceiver function and can transmit signals to or receive signals from a network device. The terminal device may include user equipment (UE), and may also be referred to as a terminal, an access station, a UE station, a remote station, a wireless communication device, a user equipment, etc. The terminal device is configured to connect people, objects, machines, etc., and may be widely used in various scenarios, including but not limited to the following: cellular communication, D2D, V2X, machine-to-machine / machine-type communication (M2M / MTC), internet of things (IoT), virtual reality (VR), augmented reality (AR), industrial control, self driving, remote medical, smart grid, smart furniture, smart office, smart wearable, smart transportation, smart city, unmanned aerial vehicle, robot, etc. For example, the terminal device may be a mobile phone, a tablet, a computer with a wireless transceiver function, a VR terminal, an AR terminal, a wireless terminal for industrial control, a wireless terminal for autonomous driving, a smart speaker for an IoT network, a wireless terminal device for remote medical care, a wireless terminal device for a smart grid, a wireless terminal device for traffic security, a wireless terminal device for a smart city, a wireless terminal device for a smart home, etc.

[0107] By way of example, but not by way of limitation, in the embodiments of the present application, the terminal device may alternatively be a wearable device. The wearable device may also be referred to as a wearable intelligent device, an intelligent wearable device, etc., and is a collective term for wearable devices, such as glasses, gloves, watches, clothes, and shoes, that are intelligently designed and developed for daily wear by using wearable technology. When the above-mentioned various terminal devices are located in a vehicle (e.g., placed in or installed in a vehicle), the terminal devices may all be regarded as on-board terminal devices. For example, the on-board terminal device is also referred to as an on-board unit (OBU). The terminal device of the present application may alternatively be an on-board assembly, on-board module, on-board part, on-board chip, or on-board unit that is incorporated in the vehicle as one or more components or units. The vehicle implements the method of the present application using the on-board module, on-board assembly, on-board part, on-board chip, or on-board unit that is incorporated in the vehicle.

[0108] In the embodiment of the present application, the communication device configured to implement the functions of the network device may be a network device, or may be a device, such as a chip system, that can support the network device in implementing the functions. The device may be installed in the network device. In the technical solution provided in the embodiment of the present application, an example in which the device configured to implement the functions of the network device is a network device is used to explain the technical solution provided in the embodiment of the present application.

[0109] In the following, some terms in the embodiments of the present application are explained and explained.

[0110] (1) Channel Bandwidth: A UE channel bandwidth supports a single NR radio frequency carrier in the uplink or downlink at a UE. From the base station perspective, different UE channel bandwidths may be supported in the same spectrum for transmitting and receiving to and from UEs connected to the base station. Transmission of multiple carriers to the same UE (carrier) or multiple carriers to different UEs within the base station channel bandwidth may be supported. From the UE perspective, a UE may be configured with one or more bandwidth parts (BWPs) / carriers, each with its own UE channel bandwidth. The UE does not need to be aware of the base station channel bandwidth or how the base station allocates bandwidth to different UEs.

[0111] The UE channel bandwidth of each UE carrier is flexibly configured, but can only be completely within the channel bandwidth of the base station. For example, the relationship between the channel bandwidth, guard band, and maximum transmission bandwidth configuration is shown in Figure 13.

[0112] (2) Operating band: The operating band is the frequency band that the device supports, for example, 900 MHz and 1.8 GHz. An operating band can include multiple carriers, and a carrier can include a transmission band and at least two guard bands. The transmission band can be used by the device to transmit a signal.

[0113] (3) Frequency domain unit: A frequency domain unit is a segment of continuous frequency domain resources in the frequency domain. For example, one transmission band may include multiple frequency domain units.

[0114] (4) Carrier signal: A carrier signal may be used for backscatter communication, may provide a carrier for the uplink transmission of a receiving device, or may provide energy to a receiving device. Compared to a carrier signal, there is a data signal. A data signal may be considered as a signal carrying modulated information. In an embodiment of the present application, the waveform corresponding to the carrier signal may be a sine wave or cosine wave of a given frequency, or amplitude and / or phase modulation is not performed on the waveform corresponding to the carrier signal. Alternatively, amplitude and / or phase modulation is performed on the waveform corresponding to the carrier signal, but the overall amplitude is insufficient for the receiving device to regard the carrier signal as a data signal. In comparison, amplitude and / or phase modulation is performed on the waveform corresponding to the data signal, but the overall amplitude is sufficient for the receiving device to regard the data signal as a data signal.

[0115] (5) The terms "system" and "network" may be used interchangeably in the embodiments of the present application. In the embodiments of the present application, "multiple" may also be understood as "at least two". "At least one" may be understood as one or more, for example, one, two, or more. For example, "including at least one" means "including one, two, or more", without limiting which are included. For example, "including at least one of A, B, and C" may mean "including A, B, or C", "including A and B, A and C, or B and C", or "including A, B, and C". The term "and / or" describes an association relationship for describing related objects, and represents that three relationships may exist. For example, A and / or B may represent the following three cases, namely, when only A exists, when both A and B exist, and when only B exists. In addition, the character " / " generally indicates an "or" relationship between related objects.

[0116] Unless otherwise specified, ordinal numbers such as "first" and "second" in the embodiments of the present application are used to distinguish between multiple objects and are not intended to limit the order, chronological order, priority or importance of the multiple objects. For example, a first device and a second device are only used to distinguish between different devices and are not used to limit the function, priority or importance of the two devices. In the embodiments of the present application, "when" and "when" may be interchanged, and "when" and "when" may be interchanged, unless otherwise specified.

[0117] The embodiments of the present application are intended to reduce the interference between signals without increasing the complexity of the filters in the receiver. In order to better understand the solutions provided in the embodiments of the present application, some related concepts of the receiver are first described.

[0118] In order to implement low power consumption, the receiver can process the received signal through amplitude modulation and envelope detection to avoid using a high-power radio frequency module, for example, a frequency mixer with high linearity. A module located in the receiver and configured to complete the envelope detection may be called an envelope detector. FIG. 2 is a diagram of the configuration of a receiver using an envelope detector. As shown in FIG. 2, the receiver mainly includes a radio frequency amplifier, an envelope detector, and a baseband amplifier. The envelope detector is a nonlinear component and has large noise. Therefore, in order to correctly demodulate the received signal, before the envelope detector, the received signal needs to be amplified by using a radio frequency amplifier. After the envelope detector outputs the baseband signal, the baseband amplifier can amplify and output the baseband signal. The receiver requires high passband selectivity. Therefore, before the radio frequency amplifier, the received radio frequency signal needs to be filtered by using a filter. It can be understood that the filter is a filter circuit including a capacitor, an inductor, and a resistor, and is mainly configured to filter the signal frequency. The filter allows a signal of a specific frequency to pass while suppressing signals of other unnecessary frequencies. This can solve the problem of interference between signals of different frequency bands. It should be noted that FIG. 2 is only an example of a receiver configuration. The specific configuration of the receiver is not limited in this embodiment of the present application. For example, the receiver may alternatively include multiple envelope detectors.

[0119] FIG. 3 is a schematic diagram of the circuit structure of an envelope detector. The envelope detector mainly includes a diode and an oscillator circuit including a capacitor and a resistor. The envelope detector is a nonlinear component, and it functions by using the unidirectional conductivity of the diode. As shown in FIG. 3, a forward voltage signal (shown in the direction of the thick arrow in the figure) is input to the diode. When the potential difference between the two sides of the diode is higher than the conduction voltage, the diode is turned on, and a current flows through the resistor R to ground, and a potential difference exists across the capacitor C, and the capacitor operates in a charged state. When a reverse voltage signal (shown in the direction of the thin arrow in the figure) is input to the diode, the diode is in a non-connected state, i.e., it is not conducted. In this case, the capacitor is in a discharged state, and a current flows through the resistor R to ground.

[0120] In the absence of an interfering signal, the input signal x of the envelope detector sig (t) is assumed to satisfy:

[0121] x sig (t)=A sig (t) × cos(2πf c,sig t), in the formula A sig (t) represents the desired signal, and f c,sig is the carrier frequency used to carry the desired signal. sig FIG. 13 is a spectrum of (t).

[0122] The output signal of the envelope detector, y sig (t) is

number

[0123] Figure 5 shows the sig This is the spectrum of (t). The frequency is 2f c,sig It can be seen that the components of are high frequency components. By filtering the high frequency components by using a low pass filter, the baseband signal

number

number

number

[0124] If there is an interfering signal, for example, the interfering signal is input to the envelope detector and x inf (t) is x inf (t)=A inf (t) × cos(2πf c,inf t), wherein A inf (t) represents the interference signal, and f c,inf is the carrier frequency used to carry the interfering signal. In this case, the input signal x(t) of the envelope detector is x(t)=x sig (t)+x inf (t) is satisfied. The spectrum of the input signal is shown in FIG.

[0125] The output signal y(t) of the envelope detector satisfies: y(t)=(x(t)) 2 =(x sig (t)+x inf (t) 2

[0126] x sig (t) and x inf (t) is substituted into the above equation, y(t) becomes

number

number

number

[0127]

number

number

number

number

[0128] Moreover, the performance of the filter directly affects the quality of communication. The indicators for measuring the performance of the filter include Q value, bandwidth, stopband suppression, insertion loss, delay time, etc. Q value and insertion loss are the most important performance indicators. Q value is a numerical value that represents the performance of the filter, and indicates the filter's ability to separate adjacent frequency components in the signal. A higher Q value indicates a narrower passband width, better frequency band selectivity, and better filtering effect. Insertion loss is the loss caused by introducing a filter into the original signal in the circuit, and is expressed in dB. A larger insertion loss value indicates a larger attenuation. For example, if the insertion loss is 3 dB, the signal power is attenuated by 50%. Therefore, the receiver needs a filter with a high Q value to achieve a good filter effect. However, the Q value of the on-chip filter is usually low. If the Q value of the on-chip filter is expected to be high, the bulk acoustic wave (BAW) or surface acoustic wave (SAW) needs to be externally connected. It is obvious that the integration level of the receiver is low and the requirement of a small receiver size cannot be met.

[0129] Considering this, a solution is provided in the embodiment of the present application. In the embodiment of the present application, the transmitting end device can transmit two signals (e.g., a first signal and a second signal) at two frequency positions (e.g., a first frequency and a second frequency). For example, the transmitting end device transmits the first signal at the first frequency position and transmits the second signal at the second frequency position. In the case of the receiving device, the radio frequency filter of the receiving end device needs to allow the first signal and the second signal to pass, in other words, the pass band of the radio frequency filter needs to encompass the first frequency and the second frequency. It will be understood that a larger interval between the first frequency and the second frequency dictates a lower requirement for the Q value of the radio frequency filter, in other words, a radio frequency filter with a higher Q value is not required. Therefore, according to the method in the embodiment of the present application, the complexity of the design and implementation of the radio frequency filter cannot be increased. In addition, the second device can receive the first signal and the second signal through envelope detection. After the envelope detection is performed, the mid-frequency component corresponding to the absolute value of the difference between the first frequency and the second frequency is the signal (referred to as the target signal in this specification) that the receiving end device needs to acquire. Therefore, the receiving end device can acquire the target signal by using a mid-frequency filter to suppress another signal containing interference. Because the frequency of the mid-frequency is lower than that of the radio frequency, the mid-frequency filter is easier to be designed and implemented under the same Q factor requirement. Therefore, according to the solution in this embodiment of the present application, after the envelope detection is performed, the second device can easily distinguish the target signal from the interference by using a mid-frequency filter, and the complexity of the design and implementation of the radio frequency filter is not increased.

[0130] For ease of understanding, an example in which a first device transmits a first signal to a second device on a first frequency and transmits a second signal on a second frequency is used to explain how to implement interference suppression in the solution provided in the embodiments of the present application.

[0131] The input of the envelope detector, x(t), is x(t)=x when there is an interference signal. sig1 (t)+x sig2 (t)+x inf (t) is satisfied. x inf (t)=A inf (t) × cos(2πf c,inf t), where A inf (t) represents the interference signal, and f c,inf is the carrier frequency used to carry the interfering signal. sig1 (t)=A sig1 (t) × cos(2πf c,sig1 t), in the formula A sig1 (t) represents the first signal, and f c,sig1 is the carrier frequency used to carry the first signal. sig2 (t)=A sig2 (t) × cos(2πf c,sig2 t), in the formula A sig2 (t) represents the second signal, and f c,sig2 is the carrier frequency used to carry the second signal. Figure 10 is a diagram of the spectrum of x(t). In Figure 10, signal 1 is the first signal and signal 2 is the second signal.

[0132] The output signal y(t) of the envelope detector satisfies: y(t)=(x(t)) 2 =(x sig1 (t)+x sig2 (t)+x inf (t) 2

[0133] x sig1 (t), x sig2 (t), and x inf (t) is substituted into the previous equation to obtain:

number

[0134] From the above equation, it can be seen that the output signal of the envelope detector contains a high frequency component, a mid frequency component, and a DC component. The frequency of the high frequency component is 2f c,sig1 , 2F c,sig2 , 2F c,inf , f c,inf +f c,sig1 , and f c,sig2 +f c,inf , and f c,sig2 +f c,sig1 The frequency of the mid-frequency component is f c,inf -f c,sig1 , f c,sig2 -f c,inf , f c,sig2 -f c,sig1 The mid-frequency components include frequencies f c,sig2 -f c,sig1 Only the component at frequency f does not include interference. c,sig2 -f c,sig1 A bandpass filter can be used to ensure that only the components of the target signal are passed and other frequency components are suppressed. As shown in FIG. 11, the interference signal is

number

number

[0135] A sig1 (t)A sig2 (t) × cos(2π(f c,sig2 -f c,sig1It is understood that t) is a mid-frequency component, and the complexity and power consumption of the mid-frequency processing is high. In order to reduce the processing complexity and power consumption, the second device may filter the mid-frequency components by using a band-pass filter, as shown in FIG. 12, and then further perform a down-conversion process on the mid-frequency components passing through the band-pass filter to obtain a baseband signal. The implementation of the down-conversion is not limited to the embodiments of the present application. For example, the second device may implement the down-conversion operation by using an envelope detector, or may implement the down-conversion operation by using a low-frequency crystal oscillator and a frequency mixer.

[0136] An example is used in which the second device can implement the down-conversion operation by using an envelope detector. For example, the input signal of the envelope detector is

number

number

[0137] The output signal of the envelope detector has a frequency of 2(f c,sig2 -f c,sig1 ) high frequency components. Therefore, by using a low pass filter, the high frequency components can be filtered out, where

number

number

number

[0138] Thus, the second device

number

[0139] An example is used in which the second device implements the down-conversion operation by using a frequency mixer. One input signal of the frequency mixer is

number

[0140] In this case, the output signal z(t) of the frequency mixer satisfies:

number

[0141] The output signal of the envelope detector has a frequency of 2(f c,sig2 -f c,sig1 ) high frequency components. Therefore, the high frequency components can be filtered out by using a low pass filter, where

number

number

number

[0142] Thus, the second device

number

[0143] In the example, A sig1 (t) and A sig2 Both of (t) may be data signals, specifically signals carrying useful information. sig1 (t) and A sig2 The modulation scheme of (t) is ASK or OOK, and at the moment t, A sig1 (t) and A sig2 It is assumed that all information bits carried by (t) are "1". In this case, the second device

number

number

number

number

[0144] In another example, A sig1 (t) and A sig2If one signal in (t) is a data signal and the other signal is a carrier signal, e.g., A sig1 If (t) is a data signal, A sig1 The modulation scheme of (t) is assumed to be ASK or OOK, and A sig2 If (t) is a carrier signal and does not carry any useful information, then A sig2 (t) can be a constant value, e.g., A sig2 (t) is always 1. In this case,

number

number

number

number

number

[0145] The following describes the solution provided in the embodiment of the present application with reference to the accompanying drawings. Figure 14 is a schematic flowchart of a signal transmitting method and a signal receiving method according to the embodiment of the present application. The following uses an example in which the transmitting end is a first device and the receiving end is a second device. The first device may be a network device, and the second device may be a terminal device.

[0146] S1401: A first device transmits a first signal to a second device for a first frequency domain unit, and transmits a second signal to a second frequency domain unit.

[0147] It will be understood that in the case of a radio frequency filter, filtering a signal within a narrow frequency range places high requirements on the radio frequency filter. In this embodiment of the present application, when transmitting a signal to a second device, the first device can transmit two signals at two frequency locations to reduce the requirements of the radio frequency filter. For example, the first device can determine (generate) a first signal and a second signal, transmit the first signal at a first frequency of a first frequency domain unit, and transmit the second signal at a second frequency of a second frequency domain unit. The first frequency domain unit can be regarded as a frequency domain resource used to transmit the first signal, and the second frequency domain unit can be regarded as a frequency domain resource used to transmit the second signal. It is noted that the first frequency may be the center frequency of the first frequency domain unit, and correspondingly, the second frequency is the center frequency of the second frequency domain unit. Alternatively, the first frequency may be the lowest frequency of the first frequency domain unit, and correspondingly, the second frequency is the lowest frequency of the second frequency domain unit. Alternatively, the first frequency may be the highest frequency of the first frequency domain unit, and correspondingly, the second frequency is the highest frequency of the second frequency domain unit. It should be noted that the first frequency unit may include two sub-frequency units, the first sub-frequency unit and the second sub-frequency unit. The frequency of the first sub-frequency unit is higher than the frequency of the second sub-frequency unit. The second frequency unit may include two sub-frequency units, namely, the third sub-frequency unit and the fourth sub-frequency unit. The frequency of the third sub-frequency unit is higher than the frequency of the fourth sub-frequency unit. In this case, the first frequency may be the center frequency of the first sub-frequency domain unit, and correspondingly, the second frequency is the center frequency of the third sub-frequency domain unit. Alternatively, the first frequency may be the lowest frequency of the first sub-frequency domain unit, and correspondingly, the second frequency is the lowest frequency of the third sub-frequency domain unit.Alternatively, the first frequency may be the highest frequency of the first sub-frequency domain unit, and correspondingly, the second frequency is the highest frequency of the third sub-frequency domain unit. Alternatively, the first frequency may be the center frequency of the second sub-frequency domain unit, and correspondingly, the second frequency is the center frequency of the fourth sub-frequency domain unit. Alternatively, the first frequency may be the lowest frequency of the second sub-frequency domain unit, and correspondingly, the second frequency is the lowest frequency of the fourth sub-frequency domain unit. Alternatively, the first frequency may be the highest frequency of the second sub-frequency domain unit, and correspondingly, the second frequency is the highest frequency of the fourth sub-frequency domain unit.

[0148] The first device transmits a first signal and a second signal. Correspondingly, the passband of the radio frequency filter of the second device can encompass the first frequency and the second frequency. It will be understood that a larger difference between the first frequency and the second frequency dictates a lower requirement for the design and implementation complexity of the radio frequency filter. Thus, when the first device transmits a first signal at the first frequency and a second signal at the second frequency, the design and implementation complexity of the radio frequency filter of the second device is not increased. It should be noted that the difference between the first frequency and the second frequency is the absolute value of the difference between the first frequency and the second frequency. For example, when the first frequency is greater than the second frequency, the difference between the first frequency and the second frequency is obtained by subtracting the second frequency from the first frequency. When the first frequency is less than the second frequency, the difference between the first frequency and the second frequency is obtained by subtracting the first frequency from the second frequency.

[0149] In addition, considering the existence of the interference signal, the second device can receive the first signal and the second signal by envelope detection. After the envelope detection is performed, the mid-frequency component corresponding to the absolute value of the difference between the first frequency and the second frequency is the target signal that the second device needs to acquire. In this case, the second device can acquire the target signal by using a mid-frequency bandpass filter to suppress another frequency component containing the interference. It can be understood that the frequency of the mid-frequency is lower than that of the radio frequency, and the mid-frequency filter is easier to design and implement under the same Q factor requirement. Therefore, after the envelope detection is performed, the second device can easily distinguish the target signal from the interference by using a mid-frequency filter.

[0150] In this embodiment of the present application, the absolute value of the difference between the first frequency and the second frequency needs to meet certain conditions, so as to reduce the requirements of the radio frequency filter as much as possible and improve the interference suppression effect as much as possible.

[0151] In a possible implementation, the first device can determine the absolute value based on one or more of the bandwidth occupied in the frequency domain by the first frequency domain unit, the bandwidth occupied in the frequency domain by the second frequency domain unit, or the bandwidth occupied in the frequency domain by a frequency domain unit used by the first device to transmit a signal to a device other than the second device. For ease of explanation, in this specification, the bandwidth occupied in the frequency domain by the first frequency domain unit is referred to as the first bandwidth, the bandwidth occupied in the frequency domain by the second frequency domain unit is referred to as the second bandwidth, and the bandwidth occupied in the frequency domain by a frequency domain unit (e.g., referred to as the third frequency domain unit) used by a device other than the second device (e.g., the third device) to transmit a signal is referred to as the third bandwidth. The absolute value of the difference between the first frequency and the second frequency can also be understood to be associated with one or more of the first bandwidth, the second bandwidth, or the third bandwidth. It will be understood that the first signal, the second signal, and the third signal are in one operating band. The operating band is a frequency band used for communication between the first device and the second device, and may be an NR operating band. Note that there may be one third device or there may be multiple third devices.

[0152] In the example, the first device transmits a first signal and a second signal within a frequency range corresponding to the channel bandwidth of the second device. In this case, the absolute value of the difference between the first frequency and the second frequency is equal to or greater than 1 / 2 of the channel bandwidth of the second device. It will be understood that the absolute value of the difference between the first frequency and the second frequency is equal to or less than the channel bandwidth of the second device. The channel bandwidth of the second device can be transmitted by the second device to the first device. Since the absolute value of the difference between the first frequency and the second frequency is equal to or greater than 1 / 2 of the channel bandwidth of the second device, the frequency of the mid-frequency component (i.e., the target signal) obtained by the second device by receiving the first signal and the second signal through envelope detection is different from the frequency of the interference signal. In other words, since the target signal and the interference signal do not overlap in the spectrum, the interference signal can be easily filtered out by using a mid-frequency filter, and the requirements for the radio frequency filter are low. For ease of understanding, the following uses a figure as an example.

[0153] FIG. 15 is a diagram of the frequency positions of the target signal and the interference signal when the absolute value of the difference between the first frequency and the second frequency is equal to 1 / 2 of the carrier bandwidth. Please note that the carrier bandwidth (BW) is equal to or less than the channel bandwidth of the second device. In FIG. 15, f1 is the first frequency, f2 is the second frequency, and f3 is the frequency of the interference signal (called the third frequency). Also in FIG. 15, f1 is the highest frequency of the BW, f2 is 1 / 2 of the BW, and f3 is the lowest frequency of the BW. As shown in FIG. 15, if the first device transmits a first signal at f1, transmits a second signal at f2, and transmits an interference signal at f3, the second device receives the first signal and the second signal through envelope detection, and the second device can obtain a signal at f1-f2, i.e., the target signal. Since the absolute value of the difference between the first frequency and the second frequency is equal to 1 / 2 of the BW, the frequency of the target signal is 1 / 2 of the BW, and the frequency of the interference signal is 1 / 2 of the BW. In other words, because the interference signal and the target signal overlap in the spectrum, it is difficult to filter out the interference signal by using a filter, and the requirements for the radio frequency filter are high.

[0154] In comparison, FIG. 16 is a diagram of the frequency positions of the target signal and the interference signal when the absolute value of the difference between the first frequency and the second frequency exceeds 1 / 2 of the carrier bandwidth. Different from FIG. 15, in FIG. 16, f2 is 1 / 3 of the BW. The second device receives the first signal and the second signal by envelope detection, and the second device can obtain a signal at f1-f2, i.e., the target signal. Since the absolute value of the difference between the first frequency and the second frequency is 2 / 3 of the BW, which is greater than 1 / 2 of the BW, the frequency of the target signal is at f1-f2, i.e., 1 / 3 of the BW, and the frequency of the interference signal is 2 / 3 of the BW. In other words, since the interference signal and the target signal do not overlap in the spectrum, the interference signal can be easily filtered out by using a medium frequency filter, and the requirements for the radio frequency filter are low.

[0155] It should be noted that in FIG. 15 and FIG. 16, an example is used in which the first frequency and the second frequency are on one side of the third frequency. The relative position relationship between the first frequency and the second frequency and the third frequency is not limited in this embodiment of the present application. For example, the first frequency and the second frequency may be on two sides of the third frequency. In addition, the first device may be configured with a carrier bandwidth. For example, the first device is configured with a carrier bandwidth based on the channel bandwidth of the second device. Therefore, before transmitting the first signal and the second signal, the first device can determine the first frequency and the second frequency.

[0156] In another example, the absolute value of the difference between the first frequency and the second frequency is equal to or greater than the sum of the third bandwidth and the fourth bandwidth, the fourth bandwidth is twice the sum of the first bandwidth and the second bandwidth, and the third signal is between the first frequency and the second frequency in the frequency domain. In other words, the absolute value of the difference between the first frequency and the second frequency is equal to or greater than the third bandwidth + 2 × (first bandwidth + second bandwidth). It can be understood that when the absolute value of the difference between the first frequency and the second frequency is equal to or greater than the third bandwidth + 2 × (first bandwidth + second bandwidth), the difference between the frequency of the target signal and the frequency of the interference signal is large, and the interference signal and the target signal are easy to distinguish. Therefore, it is easy to filter out the interference signal by using a mid-frequency filter, and the requirements for the radio frequency filter are lower. For ease of understanding, the following uses a figure as an example.

[0157] FIG. 17 is a diagram of the relative frequency positions of the first signal, the second signal and the third signal. In FIG. 17, an example is used in which the first frequency (f1) is the lowest frequency of the first frequency domain unit, and the second frequency (f2) is the lowest frequency of the second frequency domain unit. From FIG. 17, it can be seen that if the absolute value of the difference between the first frequency and the second frequency is equal to or greater than the third bandwidth + 2 × (first bandwidth + second bandwidth), the target signal and the interference signal can be distinguished from each other because the target signal and the interference signal do not overlap in the spectrum. It can be seen that the larger the absolute value of the difference between the first frequency and the second frequency, the longer the distance between the target signal and the interference signal in the spectrum, in other words, in FIG. 17, the longer the distance between the frequency boundary of the interference signal and the frequency boundary of the target signal. In this way, it is easier for the second device to extract the target signal by using a mid-frequency filter.

[0158] Before transmitting the first signal and the second signal, the first device can determine the first frequency and the second frequency. For example, the first device can determine the first frequency and determine the second frequency based on the absolute value of the difference between the first frequency and the second frequency. Alternatively, the first device can determine the second frequency and then determine the first frequency based on the absolute value of the difference between the first frequency and the second frequency. The second device needs to know the absolute value of the difference between the first frequency and the second frequency, so that the second device can know the frequency position where the target signal is acquired.

[0159] In a possible implementation, the absolute value of the difference between the first frequency and the second frequency may be predefined or preconfigured. For example, the absolute value of the difference between the first frequency and the second frequency is a preset value. For example, the preset value may be determined based on one or more of the operating bands of the first signal and the second signal, the subcarrier spacing of the first signal, or the subcarrier spacing of the second signal. Also, the preset value may be understood to be associated with one or more of the following: the operating bands of the first signal and the second signal, the subcarrier spacing of the first signal, or the subcarrier spacing of the second signal. Alternatively, the preset value has a correspondence with one or more of the following: the operating bands of the first signal and the second signal, the subcarrier spacing of the first signal, or the subcarrier spacing of the second signal. Since the absolute value of the difference between the first frequency and the second frequency is a preset value, after the first device establishes a communication connection to the second device, the first device transmits a first signaling between the first device and the second device to the second device by using the first frequency and the second frequency. In other words, the absolute value of the difference between the first frequency and the second frequency is preset, which is applicable to a scenario where the first device does not need to inform the second device of the absolute value of the difference between the first frequency and the second frequency. Indeed, the absolute value of the difference between the first frequency and the second frequency is a preset value, which may alternatively be used by the first device to transmit a signaling other than the first signaling between the first device and the second device to the second device.

[0160] When the absolute value of the difference between the first frequency and the second frequency is a preset value, the first device can transmit a first signal at the first frequency and transmit a second signal at a second frequency based on the preset value. Correspondingly, the second device can also obtain a signal at a frequency position corresponding to the absolute value of the difference between the first frequency and the second frequency based on the preset value.

[0161] In another possible implementation, the absolute value of the difference between the first frequency and the second frequency may be signaled by the first device to the second device.

[0162] S1402: The first device transmits first instruction information to the second device, and in response, the second device receives the first instruction information transmitted by the first device, where the first instruction information indicates an absolute value of a difference between the first frequency and the second frequency.

[0163] The first device can dynamically indicate the absolute value of the difference between the first frequency and the second frequency by using the first instruction information, which is more flexible. For example, when determining the absolute value of the difference between the first frequency and the second frequency, the first device can refer to the maximum transmission bandwidth capability of the second device. Therefore, for different receiving devices, the first device can adaptively adjust the absolute value of the difference between the first frequency and the second frequency to reduce the requirements of the radio frequency filter of each receiving device as much as possible. The second device acquires a signal at a frequency position corresponding to the absolute value of the difference between the first frequency and the second frequency based on the absolute value indicated by the first instruction information.

[0164] The specific implementation of the first indication information indicating the absolute value of the difference between the first frequency and the second frequency is not limited in this embodiment of the present application.For example, the first indication information can directly indicate the absolute value of the difference between the first frequency and the second frequency, which is simple and straightforward.For example, the first indication information can include the absolute value of the difference between the first frequency and the second frequency.

[0165] For example, the first instruction information may indirectly indicate the absolute value of the difference between the first frequency and the second frequency. For example, the first instruction information may include the difference between the first frequency and the second frequency. The second device may determine the absolute value of the difference between the first frequency and the second frequency based on the difference between the first frequency and the second frequency. In another example, the first instruction information may include the first frequency and the second frequency. The second device may determine the absolute value of the difference between the first frequency and the second frequency based on the difference between the first frequency and the second frequency. In yet another example, the first instruction information may include some parameters used to determine the absolute value of the difference between the first frequency and the second frequency, and the second device may determine the absolute value of the difference between the first frequency and the second frequency based on these parameters. These parameters may include, for example, one or more of the operating bands of the first signal and the second signal, the subcarrier spacing of the first signal, or the subcarrier spacing of the second signal. For example, the first instruction information includes the operating bands of the first signal and the second signal, and indirectly indicates the absolute value of the difference between the first frequency and the second frequency. The second device can determine the absolute value of the difference between the first frequency and the second frequency based on the correspondence between the operating bands and the absolute value of the difference between the first frequency and the second frequency, and the operating bands of the first signal and the second signal. In another example, the first instruction information includes the subcarrier spacing of the first signal, and the second device can determine the absolute value of the difference between the first frequency and the second frequency based on the correspondence between the subcarrier spacing and the absolute value of the difference between the first frequency and the second frequency, and the subcarrier spacing of the first signal.

[0166] It should be noted that since the absolute value of the difference between the first frequency and the second frequency may be a preset value, S1402 is not a required step, i.e., an optional step, and is indicated by using a dashed line in Fig. 14. In addition, in this embodiment of the present application, the order of performing S1401 and S1402 is not limited. Specifically, S1402 may be performed before S1401, after S1401, or simultaneously with S1401.

[0167] In a possible embodiment, at most one of the first signal and the second signal is used to provide a carrier for the uplink transmission of the second device. In other words, at most one of the first signal and the second signal is a carrier signal. For example, the first signal is a data signal and the second signal is a carrier signal; or the first signal is a carrier signal and the second signal is a data signal; or both the first signal and the second signal are data signals. It will be understood that, compared with a carrier signal, a data signal carries modulation information. If one of the first signal and the second signal is a data signal and the other signal is a carrier signal, the resource overhead of the first device can be reduced. If both the first signal and the second signal are data signals, the reliability of data transmission can be improved.

[0168] In a possible implementation, the power of the first signal is the same as the power of the second signal. Alternatively, the power of the first signal may be different from the power of the second signal.

[0169] For example, if the power of the first signal is the same as the power of the second signal, neither the first signal nor the second signal may be a carrier signal, in other words, both the first signal and the second signal are data signals. If the power of the first signal is greater than the power of the second signal, the first signal is a data signal and the second signal may be a carrier signal to reduce resource overhead. It may also be understood that the first device may determine that the power of the first signal is the same as the power of the second signal, and the first device may determine that both the first signal and the second signal are data signals. Alternatively, the first device may determine that the power of the first signal is greater than the power of the second signal, and the first device may determine that the first signal is a data signal and the second signal is a carrier signal. It may be understood that the carrier signal does not carry useful information and may be transmitted at low power to reduce the energy consumption of the device. Thus, in some examples, the first signal is a data signal, the second signal is a carrier signal, and the transmission power of the first signal is greater than the transmission power of the second signal. It may also be understood that the first device determines that the first signal is a data signal and the second signal is a carrier signal, and the first device determines that the transmission power of the first signal is greater than the transmission power of the second signal to ensure the reliability of the data transmission as much as possible. Indeed, if both the first signal and the second signal are data signals, the transmission power of the first signal may be the same as the transmission power of the second signal. It may also be understood that the first device determines that both the first signal and the second device are data signals, and the first device determines that the transmission power of the first signal is the same as the transmission power of the second signal.

[0170] In a possible embodiment, the carrier signal may be a single-carrier signal. For example, if the first signal is a carrier signal, the first signal is a single-carrier signal. In another example, if the second signal is a carrier signal, the first signal is a single-carrier signal. Alternatively, the first signal or the second signal occupies one subcarrier in the frequency domain. Alternatively, the first signal or the second signal is a signal that includes a subcarrier that carries energy.

[0171] In a possible embodiment, the first signal and / or the second signal are / are a multi-carrier signal. Alternatively, the first signal and / or the second signal occupy multiple sub-carriers in the frequency domain. The first signal and / or the second signal are / are a signal comprising multiple sub-carriers carrying energy.

[0172] Considering that the frequency domain resource used for communication between the first device and the second device may be an NR carrier or an LTE carrier, in order to reduce the impact on the operating band of the NR carrier, the frequency location of the first signal and the frequency location of the second signal need to meet certain conditions. It can also be considered that the first frequency domain unit and the second frequency domain unit need to meet certain conditions, which include the following two cases:

[0173] In the first case, at least one of the first signal and the second signal is in a guard band of one NR carrier or one LTE carrier; and / or the absolute value of the difference between the first frequency and the second frequency is equal to or greater than the transmission bandwidth of one NR carrier or one LTE carrier. For ease of understanding, the following uses a figure as an example.

[0174] FIG. 18 is a diagram of the location of the first signal and the second signal on the NR carrier. In FIG. 18, an example is used in which the first frequency domain unit is located in the guard band of the NR carrier and the second frequency domain unit is located in the transmission band of the NR carrier. In other words, the first signal is in the guard band of the NR carrier and the second signal is in the transmission band of the NR carrier. For example, if the first signal is a carrier signal, the first signal may be in the guard band of the NR carrier. Alternatively, if the first signal is in the guard band of the NR carrier, the first signal may be considered to be a carrier signal. Because the first signal is in the guard band of the NR carrier, the transmission of the first signal does not affect the transmission in the transmission band of the NR carrier.

[0175] FIG. 19 is a diagram of the positions of the first signal and the second signal on the NR carrier. In FIG. 19, an example is used in which the first frequency domain unit is located in one guard band of the NR carrier, and the second frequency domain unit is located in another guard band of the NR carrier. In other words, the first signal is in the guard band of the NR carrier, and the second signal is in another guard band of the NR carrier. Since both the first signal and the second signal are in the guard band of the NR carrier, the transmission of the first signal and the second signal does not affect the transmission in the transmission band of the NR carrier.

[0176] In the second case, both the first signal and the second signal are in the transmission bandwidth of the NR carrier, and the difference between the minimum value of the first frequency domain unit and the lowest frequency of the transmission bandwidth is less than or equal to a first value, and the difference between the maximum value of the second frequency domain unit and the highest frequency of the transmission bandwidth is less than or equal to a second value. The first value may be 0, and the second value may also be 0. For example, the difference between the minimum value of the first frequency domain unit and the lowest frequency of the transmission bandwidth may be 0, and the difference between the maximum value of the second frequency domain unit and the highest frequency of the transmission bandwidth may be 0. When the first signal and the second signal are in the transmission bandwidth of the NR carrier, the first frequency domain unit and the second frequency domain unit may be located at both ends of the transmission bandwidth of the NR carrier, respectively, to ensure the anti-interference performance of the first signal and the second signal as much as possible. For ease of understanding, the following uses a figure as an example.

[0177] Figure 20 is a diagram of the positions of the first signal and the second signal on the NR carrier. In Figure 20, an example is used in which the first frequency domain unit is located at one end of the transmission band of the NR carrier, and the second frequency domain unit is located at the other end of the transmission band of the NR carrier. Since the first signal and the second signal are respectively at the two ends of the NR carrier, and the frequency positions of the first signal and the second signal are close to the guard band of the NR carrier, the anti-interference performance of the first signal and the second signal can be ensured as much as possible.

[0178] The modulation scheme of the first signal and the second signal is not limited in this embodiment of the present application. The shift keying scheme of the first signal and / or the shift keying scheme of the second signal are on-off shift keying, multi-carrier on-off shift keying, double sideband amplitude shift keying, single sideband amplitude shift keying, phase reversal amplitude shift keying, multiple amplitude shift keying, frequency shift keying, Gaussian frequency shift keying, multiple frequency shift keying, binary phase shift keying, quadrature phase shift keying, pulse amplitude modulation, pulse width modulation, pulse position modulation, pulse density modulation, or pulse code modulation. The modulation schemes of the first signal and the second signal may be the same or different.

[0179] In possible implementations, the antenna port of the first signal is the same as the antenna port of the second signal. The cyclic prefix length of the first signal is the same as the cyclic prefix length of the second signal. The subcarrier spacing of the first signal is the same as the subcarrier spacing of the second signal. The waveform of the first signal and / or the waveform of the second signal is OFDM with CP. The waveform of the first signal and / or the waveform of the second signal is OFDM with CP and DFT spreading is performed.

[0180] It should be understood that the first device may transmit a first signal at a first frequency and transmit a second signal at a second frequency. In this way, the second device can receive the first signal and the second signal by envelope detection and distinguish the signal of the DC carrier from the interference signal. However, the interference changes dynamically. In the absence of interference, if the first device still transmits the first signal at the first frequency and transmits the second signal at the second frequency, the resource overhead is obviously increased. Therefore, in this embodiment of the present application, in the absence of interference, the first device can alternatively transmit one signal at one frequency location to reduce the resource overhead. However, the second device does not know whether the first device transmits two signals or one signal. If the first device transmits two signals and the second device receives the signal based on the case where the first device transmits one signal, the receiving performance of the second device cannot be ensured. Similarly, if a first device transmits one signal and a second device receives a signal based on the first device transmitting two signals, the receiving performance of the second device cannot be ensured.

[0181] Therefore, the first device can instruct the second device on the signal reception scheme so that the first device and the second device have a consistent understanding of the signal reception scheme to ensure the reception performance of the second device.

[0182] S1403: The first device transmits second instruction information to the second device, and in response, the second device receives the second instruction information transmitted by the first device.

[0183] The second instruction information can instruct the second device to receive the signal in a manner. In this embodiment of the present application, the second device to receive the signal in a manner including a first receiving manner and a second receiving manner. Correspondingly, the second instruction information can instruct the second device to receive the signal in the first receiving manner or the second receiving manner.

[0184] The first receiving method instructs to receive a signal based on the absolute value of the difference between the first frequency and the second frequency. The second receiving method instructs to receive a signal based on the frequency of the DC carrier and the absolute value of the difference between the first frequency and the second frequency. It can be understood that the first device transmits a first signal and a second signal. For the second device, when there is an interference signal, the second device can receive a signal at a frequency position obtained by subtracting the second frequency from the first frequency. When there is no interference signal, the second device can further receive a low-frequency signal near the DC carrier in addition to receiving a signal at a frequency position obtained by subtracting the second frequency from the first frequency. Therefore, the first device can inform the second device of the signal receiving method to ensure the receiving performance of the second device as much as possible.

[0185] The specific implementation form of the second instruction information is not limited in this embodiment of the present application. For example, the second instruction information can directly indicate the first receiving method or the second receiving method. For example, the second instruction information is 1-bit information. The bit value "0" indicates the first receiving method, and correspondingly, the bit value "1" indicates the second receiving method. Alternatively, the bit value "1" indicates the first receiving method, and correspondingly, the bit value "0" indicates the second receiving method.

[0186] For example, the second instruction information can indirectly indicate the first receiving scheme or the second receiving scheme. For example, the second instruction information can indicate a signal deployment mode, and the deployment mode includes a transmission band deployment or a guard band deployment. In the transmission band deployment, a signal is transmitted at a frequency of the transmission band. In the guard band deployment, a signal is transmitted at a frequency of the guard band. When the signal deployment mode is the guard band deployment, it may be considered by default that the first device transmits two signals to indirectly indicate the second receiving scheme. When the signal deployment mode is the transmission band deployment, it may be considered by default that the first device transmits one signal to indirectly indicate the first receiving scheme. In another example, the second instruction information can indicate a difference in frequency. When the difference in frequency satisfies a specific condition that the absolute value of the difference between the first frequency and the second frequency needs to satisfy, the second instruction information indirectly indicates the second receiving scheme. If the frequency difference does not satisfy a specific condition that the absolute value of the difference between the first frequency and the second frequency must satisfy, the second instruction information indirectly indicates the first receiving method.

[0187] For ease of understanding, the first receiving method and the second receiving method are described below with reference to the accompanying drawings. In the following Fig. 21 and Fig. 22, an example is used in which the signal output by the envelope detector in the second device includes a DC carrier component and a mid-frequency component, and high-frequency components are not shown. For details, please refer to the contents of the above-mentioned envelope detection principle. Details are not repeated in this specification.

[0188] FIG. 21 is a diagram of the transmission of a signal by a first device and the reception of a signal by a second device. In FIG. 21, an example is used in which, when there is interference, the first device transmits a first signal at f1 and transmits a second signal at f2, and when there is no interference, the first device transmits the first signal at f1. The second device receives the first signal and the second signal by envelope detection, and can obtain a signal, i.e., a target signal, at the position of the frequency difference between the first frequency and the second frequency. The frequency carrying the target signal can also be understood to be the absolute value of the difference between the first frequency and the second frequency. When there is no interference, the signal received by the second device is near the DC carrier. From FIG. 21, it can be obtained that when there is interference, the interference signal is near the DC carrier. So the interference signal can be suppressed by using a band pass filter. When there is no interference, a low pass filter can be used for filtering.

[0189] FIG. 22 is another diagram of the transmission of a signal by a first device and the reception of a signal by a second device. In FIG. 22, an example is shown in which, when there is interference, the first device transmits a first signal at f1 and a second signal at f2, and when there is no interference, the first device transmits a first signal at f1 and a second signal at f2. Similar to FIG. 21, the second device can receive the first signal and the second signal by envelope detection and obtain a signal, i.e., a target signal, at the position of the frequency difference between the first frequency and the second frequency. When there is no interference, the signal received by the second device further includes a signal at the position of the frequency difference between the first frequency and the second frequency in addition to the signal near the DC carrier. From FIG. 22, it can be seen that when there is interference, the interference signal is near the DC carrier. So the interference signal can be suppressed by using a bandpass filter. When there is no interference, both the signal on the DC carrier and the signal at Δf carry useful information. Therefore, the second device can receive the signal on the DC carrier and the signal at Δf, and then perform filtering by using a low-pass filter, so that the receiving performance of the first signal and the second signal can be ensured.

[0190] S1404: A second device receives the first signal and the second signal by envelope detection.

[0191] For how the second device receives the signal by envelope detection, please refer to the explanation of the principle of the envelope detector above, and the details will not be repeated here.

[0192] S1405: The second device acquires a target signal from the received signal.

[0193] The second device can receive a signal at a frequency location based on the second instruction information, or it can be considered that the second device can determine filter parameters for filtering the signal output by the envelope detector to obtain the target signal based on the second instruction information.

[0194] When there is interference, the above describes the method of better suppressing interference in this embodiment of the present application, and the solution of the filter after the envelope detector is described.Details are not repeated in this specification.When there is no interference, the following describes the method of the second device receiving the first signal and the second signal and obtaining the target signal.

[0195] Assuming there is no interference, the input signal x(t) of the envelope detector satisfies: x(t)=x sig1 (t)+x sig2 (t) x sig2 (t)=A sig1 (t) × cos(2πf c,sig1 t) and x sig2 (t)=A sig2 (t) × cos(2πf c,sig2 t).

[0196] The output signal y(t) of the envelope detector satisfies: y(t)=(x(t)) 2 =(x sig1 (t)+x sig2 (t) 2

[0197] x sig1 (t) and x sig2 (t) is substituted into the previous equation to obtain:

number

[0198] A sig1 (t) and A sig2 (t) respectively represent the first signal and the second signal, and f c,sig1 and f c,sig2 are the carrier frequencies used for the first and second signals, respectively. The output of the envelope detector, y(t), has a frequency of 2f c,sig1 , 2F c,sig2 , and f c,sig2 +fc,sig1 After the low-pass filter performs filtering on y(t), the target signal

number

number

number

[0199] A sig1 (t)A sig2 (t) × cos(2π(f c,sig2 -f c,sig1 It will be understood that A )t) is a mid-frequency component. In order to reduce processing complexity and power consumption, the second device may filter the mid-frequency component by using a band-pass filter, and then further perform a down-conversion process on the mid-frequency component passing through the band-pass filter to obtain a baseband signal. The implementation of the down-conversion is not limited to the embodiments of the present application. For example, the second device may implement the down-conversion operation by using an envelope detector, or may implement the down-conversion operation by using a low-frequency crystal oscillator and a frequency mixer. After the down-conversion operation of the second device is performed, A sig1 (t) and / or A sig2 Regarding how to recover the information carried by (t), when the down-conversion operation is implemented by using an envelope detector, sig1 (t) and / or A sig2 (t) refers to the related content to recover the information carried by (t), or when the down-conversion operation is implemented by using a low-frequency crystal oscillator and a frequency mixer, sig1 (t) and / or A sig2Please refer to the related content for recovering the information carried by (t), and the details will not be repeated here.

[0200] According to the solution provided in this embodiment of the present application, the transmitting end device can transmit two signals at two frequency positions, and the receiving end device receives the two signals through envelope detection without increasing the complexity of the design and implementation of the radio frequency filter. In addition, the mid-frequency component output by the envelope detector of the second device can be regarded as the signal that the second device needs to acquire. When there is interference, the interference exists in the high frequency component, and the mid-frequency component does not contain the interference. This allows the signal on the DC carrier to be distinguished from the interference signal, since only the mid-frequency component passes through the mid-frequency filter. Because the frequency of the mid-frequency is lower than that of the radio frequency, the mid-frequency filter is easier to design and implement under the same Q factor requirement. Therefore, according to the solution in this embodiment of the present application, by using the mid-frequency filter after the envelope detection is performed, the target signal and the interference are easily distinguished, and the complexity of the design and implementation of the radio frequency filter is not increased.

[0201] In the embodiments provided in the present application, the methods provided in the embodiments of the present application are described separately from the perspective of the interaction between the terminal device, the access network device, and the core network device. To implement the functions of the aforementioned methods provided in the embodiments of the present application, the terminal device, the access network device, and the core network device may include hardware structures and / or software modules, and implement the aforementioned functions in the form of a hardware structure, a software module, or a combination of a hardware structure and a software module. Whether a function among the aforementioned functions is performed by using a hardware structure, a software module, or a combination of a hardware structure and a software module depends on the specific application and design constraints of the technical solution.

[0202] The embodiments of the present application further provide a communication device.The following describes a communication device configured to implement the aforementioned method in the embodiments of the present application with reference to the accompanying drawings.

[0203] FIG. 23 is a block diagram of a communication device 2300 according to an embodiment of the present application. The communication device 2300 may include a processing module 2310 and a transceiver module 2320. Optionally, a storage unit may be included. The storage unit may be configured to store instructions (codes or programs) and / or data. The processing module 2310 and the transceiver module 2320 may be coupled to the storage unit. For example, the processing module 2310 may read the instructions (codes or programs) and / or data in the storage unit to implement the corresponding method. The aforementioned modules may be independently located or may be partially or fully integrated.

[0204] In some possible implementations, the communication device 2300 can correspondingly implement the behavior and functions of the first device in the above-mentioned method embodiments. The communication device 2300 may be the first device, or may be a component (e.g., a chip or circuit) used in the first device, or may be a chip or group of chips in the first device, or may be a portion of a chip configured to perform the associated method function. For example, the communication device 2300 may perform steps such as S1401, S1402, and S1403 in FIG. 14.

[0205] For example, the processing module 2310 is configured to determine a first signal and a second signal. The transceiver module 2320 is configured to transmit the first signal to the second device for a first frequency domain unit and transmit the second signal for a second frequency domain unit. The first frequency domain unit encompasses a first frequency, and the second frequency domain unit encompasses a second frequency. The absolute value of the difference between the first frequency and the second frequency is associated with one or more of the following; a first bandwidth, a second bandwidth, or a third bandwidth. The first bandwidth is a bandwidth occupied by the first frequency domain unit in the frequency domain, and the second bandwidth is a bandwidth occupied by the second frequency domain unit in the frequency domain. The third bandwidth is a bandwidth occupied by the third frequency domain unit in the frequency domain, and the third frequency domain unit is used by the first device to transmit the third signal to the third device. The first signal, the second signal, and the third signal are in one operating band.

[0206] In an optional implementation, the transceiver module 2320 is further configured to transmit the first instruction information to the second device, the first instruction information indicating an absolute value of a difference between the first frequency and the second frequency.

[0207] In an optional embodiment, the transceiver module 2320 is further configured to transmit second instruction information to the second device. The second instruction information instructs the second device to receive the signal in the first receiving manner or the second receiving manner. The first receiving manner instructs the second device to receive the signal based on an absolute value of a difference between the first frequency and the second frequency. The second receiving manner instructs the second device to receive the signal based on a frequency of a DC carrier wave and an absolute value of a difference between the first frequency and the second frequency.

[0208] For details, please refer to the relevant contents in any of the embodiments of Figures 14 to 22. Details will not be repeated in this specification.

[0209] For example, the processing module 2310 is configured to determine a first signal and a second signal. The transceiver module 2320 is configured to transmit the first signal to the second device for a first frequency domain unit and transmit the second signal for a second frequency domain unit. The first signal and the second signal are in one operating band. The first frequency domain unit encompasses a first frequency, and the second frequency domain unit encompasses a second frequency. The absolute value of the difference between the first frequency and the second frequency is a preset value. Alternatively, the transceiver module 2320 is further configured to transmit the absolute value of the difference between the first frequency and the second frequency to the second device.

[0210] In an optional embodiment, the transceiver module 2320 is further configured to transmit second instruction information to the second device. The second instruction information instructs the second device to receive the signal in the first receiving manner or the second receiving manner. The first receiving manner instructs the second device to receive the signal based on an absolute value of a difference between the first frequency and the second frequency. The second receiving manner instructs the second device to receive the signal based on a frequency of a DC carrier wave and an absolute value of a difference between the first frequency and the second frequency.

[0211] For details, please refer to the relevant contents in any of the embodiments of Figures 14 to 22. Details will not be repeated in this specification.

[0212] In some other possible implementations, the communication device 2300 can correspondingly implement the behavior and functions of the second device in the above-mentioned method embodiments. The communication device 2300 may be the second device, or may be a component (e.g., a chip or circuit) used in the second device, or may be a chip or group of chips in the second device, or may be a portion of a chip configured to perform the associated method functions. For example, the communication device 2300 may perform steps such as S1401, S1402, S1403, S1404, and S1405 of FIG. 14.

[0213] For example, the transceiver module 2320 is configured to receive the first signal and the second signal through envelope detection. The processing module 2310 is configured to acquire the target signal. The frequency carrying the target signal includes an absolute value of a difference between a first frequency carrying the first signal and a second frequency carrying the second signal. In another example, the transceiver module 2320 is configured to receive the first signal and the second signal through envelope detection. The processing module 2310 is configured to acquire the target signal. The frequency carrying the target signal includes an absolute value of a difference between a first frequency carrying the first signal and a second frequency carrying the second signal. The absolute value of the difference between the first frequency and the second frequency is a preset value, or the absolute value of the difference between the first frequency and the second frequency is acquired from the first device.

[0214] In an optional embodiment, the processing module 2310 is further configured to determine a receiving scheme used to acquire the target signal. The receiving scheme includes a first receiving scheme or a second receiving scheme. The first receiving scheme dictates receiving a signal based on an absolute value of a difference between a first frequency and a second frequency. The second receiving scheme dictates receiving a signal based on a frequency of a DC carrier and an absolute value of a difference between the first frequency and a second frequency.

[0215] In an optional embodiment, the transceiver module 2320 is further configured to receive second instruction information transmitted by the first device, the second instruction information instructing the first receiving manner or the second receiving manner.

[0216] For details, please refer to the relevant contents in any of the embodiments of Figures 14 to 22. Details will not be repeated in this specification.

[0217] It should be understood that in this embodiment of the application, the processing module 2310 may be implemented as a processor or circuitry associated with a processor, and the transceiver module 2320 may be implemented as a transceiver, or circuitry associated with a transceiver, or a communications interface.

[0218] FIG. 24 is a block diagram of a communication device 2400 according to an embodiment of the present application. The communication device 2400 may be a first device and may implement the functions of the first device in the method provided in the embodiment of the present application. Alternatively, the communication device 2400 may be a device that can support the first device in implementing the corresponding functions of the method provided in the embodiment of the present application. The communication device 2400 may be a chip system. In this embodiment of the present application, the chip system may include a chip, or may include a chip and other discrete components. For specific functions, please refer to the description of the above method embodiment. The communication device 2400 may be a second device and may implement the functions of the second device in the method provided in the embodiment of the present application. Alternatively, the communication device 2400 may be a device that can support the second device in implementing the corresponding functions of the method provided in the embodiment of the present application. The communication device 2400 may be a chip system. In this embodiment of the present application, the chip system may include a chip, or may include a chip and other discrete components. For specific functions, please refer to the description of the above method embodiments.

[0219] The communication device 2400 includes one or more processors 2401 configured to implement or support the communication device 2400 in implementing the function of the first device in the method provided in the embodiment of the present application. For details, please refer to the detailed description of the example of the method. Details will not be described in this specification. The one or more processors 2401 may alternatively be configured to implement or support the communication device 2400 in implementing the function of the second device in the method provided in the embodiment of the present application. For details, please refer to the detailed description of the example of the method. Details will not be described in this specification. The processor 2401 may also be called a processing unit or a processing module, and may implement a specific control function. The processor 2401 may be a general-purpose processor or a special-purpose processor, etc. For example, the processor includes a central processing unit, an application processor, a modem processor, a graphic processor, an image signal processor, a digital signal processor, a video codec processor, a controller, a memory, a neural network processor, etc. The central processing unit may be configured to control the communication device 2400, execute a software program, and / or process data. The different processors may be separate components or may be integrated into one or more processors, for example integrated into one or more application specific integrated circuits.

[0220] Optionally, the communication device 2400 includes one or more memories 2402 configured to store instructions 2404. The instructions may be executed by the processor 2401 to enable the communication device 2400 to execute the method described in the above method embodiment. The memory 2402 and the processor 2401 may be located separately or integrated, or the memory 2402 and the processor 2401 may be considered to be coupled. The coupling in this embodiment of the present application may be an indirect coupling or communication connection between devices, units, or modules in an electrical, mechanical, or other form, and is used for information exchange between the devices, units, or modules. The processor 2401 may work in cooperation with the memory 2402. At least one of the at least one memory may be included in the processor. It should be noted that the memory 2402 is not required and is therefore illustrated in FIG. 24 by using a dashed line.

[0221] Optionally, the memory 2402 may further store data. The processor and the memory may be located separately or integrated together. In this embodiment of the present application, the memory 2402 may be a non-volatile memory, such as a hard disk drive (HDD) or a solid-state drive (SSD), or a volatile memory, such as a random-access memory (RAM). The memory is any other medium that can carry or store program code expected in the form of instructions or data structures and can be accessed by a computer, but is not limited thereto. The memory in the embodiment of the present application may alternatively be a circuit or any other device that can implement a storage function and is configured to store program instructions and / or data.

[0222] Optionally, the communication device 2400 may include instructions 2403 (sometimes referred to as code or programs), which may be executed by a processor to enable the communication device 2400 to perform the methods described in the previous embodiments. The processor 2401 may store data.

[0223] Optionally, the communications device 2400 may further include a transceiver 2405 and / or an antenna 2406. The transceiver 2405 may be referred to as a transceiver unit, a transceiver module, a transceiver device, a transceiver circuit, a transceiver, an input / output interface, etc., and is configured to implement transceiver functionality of the communications device 2400 via the antenna 2406.

[0224] The processor 2401 and transceiver 2405 described in this application may be implemented in an integrated circuit (IC), an analog IC, a radio frequency identification (RFID), a mixed signal IC, an ASIC, a printed circuit board (PCB), an electronic device, etc. The communication device described herein may be implemented by an independent device (e.g., an independent integrated circuit or a mobile phone) or may be part of a larger device (e.g., a module that may be incorporated into another device). For details, please refer to the above description of the terminal device and the network device. Details will not be repeated here.

[0225] In a possible implementation, the communication device 2400 can correspondingly implement the behavior and functions of the first device in the above-mentioned method embodiments. The communication device 2400 may be the first device, or may be a component (e.g., a chip or circuit) used in the first device, or may be a chip or a group of chips in the first device, or may be a part of a chip configured to perform the associated method functions. For example, the communication device 2400 may perform steps such as S1401, S1402, and S1403 in FIG. 14.

[0226] For example, the processor 2401 is configured to determine a first signal and a second signal. The transceiver 2405 is configured to transmit the first signal to the second device for a first frequency domain unit and transmit the second signal for a second frequency domain unit. The first frequency domain unit encompasses a first frequency, and the second frequency domain unit encompasses a second frequency. The absolute value of the difference between the first frequency and the second frequency is associated with one or more of the following; a first bandwidth, a second bandwidth, or a third bandwidth. The first bandwidth is a bandwidth occupied by the first frequency domain unit in the frequency domain, and the second bandwidth is a bandwidth occupied by the second frequency domain unit in the frequency domain. The third bandwidth is a bandwidth occupied by the third frequency domain unit in the frequency domain, and the third frequency domain unit is used by the first device to transmit the third signal to the third device. The first signal, the second signal, and the third signal are in one operating band.

[0227] In an optional embodiment, the transceiver 2405 is further configured to transmit the first instruction information to the second device, the first instruction information indicating an absolute value of a difference between the first frequency and the second frequency.

[0228] In an optional embodiment, the transceiver 2405 is further configured to transmit second instruction information to the second device. The second instruction information instructs the second device to receive the signal in the first receiving manner or the second receiving manner. The first receiving manner instructs the second device to receive the signal based on an absolute value of a difference between the first frequency and the second frequency. The second receiving manner instructs the second device to receive the signal based on a frequency of a DC carrier wave and an absolute value of a difference between the first frequency and the second frequency.

[0229] For details, please refer to the relevant contents in any of the embodiments of Figures 14 to 22. Details will not be repeated in this specification.

[0230] For example, the processor 2401 is configured to determine a first signal and a second signal. The transceiver 2405 is configured to transmit the first signal to the second device for a first frequency domain unit and transmit the second signal for a second frequency domain unit. The first signal and the second signal are in one operating band. The first frequency domain unit encompasses a first frequency, and the second frequency domain unit encompasses a second frequency. The absolute value of the difference between the first frequency and the second frequency is a preset value. Alternatively, the transceiver 2405 is further configured to transmit the absolute value of the difference between the first frequency and the second frequency to the second device.

[0231] In an optional embodiment, the transceiver 2405 is further configured to transmit second instruction information to the second device. The second instruction information instructs the second device to receive the signal in the first receiving manner or the second receiving manner. The first receiving manner instructs the second device to receive the signal based on an absolute value of a difference between the first frequency and the second frequency. The second receiving manner instructs the second device to receive the signal based on a frequency of a DC carrier wave and an absolute value of a difference between the first frequency and the second frequency.

[0232] For details, please refer to the relevant contents in any of the embodiments of Figures 14 to 22. Details will not be repeated in this specification.

[0233] In some other possible implementations, the communication device 2400 can correspondingly implement the behavior and functions of the second device in the above-mentioned method embodiments. The communication device 2400 may be the second device, or may be a component (e.g., a chip or circuit) used in the second device, or may be a chip or group of chips in the second device, or may be a part of a chip configured to perform the associated method functions. For example, the communication device 2400 may perform steps such as S1401, S1402, S1403, S1404, and S1405 of FIG. 14.

[0234] For example, the transceiver 2405 is configured to receive the first signal and the second signal through envelope detection. The processing module 2310 is configured to acquire the target signal. The frequency carrying the target signal includes an absolute value of the difference between a first frequency carrying the first signal and a second frequency carrying the second signal. In another example, the transceiver 2405 is configured to receive the first signal and the second signal through envelope detection. The processor 2401 is configured to acquire the target signal. The frequency carrying the target signal includes an absolute value of the difference between a first frequency carrying the first signal and a second frequency carrying the second signal. The absolute value of the difference between the first frequency and the second frequency is a preset value, or the absolute value of the difference between the first frequency and the second frequency is acquired from the first device.

[0235] In an optional embodiment, the processor 2401 is further configured to determine a receiving scheme used to acquire the target signal. The receiving scheme includes a first receiving scheme or a second receiving scheme. The first receiving scheme instructs to receive the signal based on an absolute value of a difference between the first frequency and the second frequency. The second receiving scheme instructs to receive the signal based on a frequency of a DC carrier and an absolute value of a difference between the first frequency and the second frequency.

[0236] In an optional embodiment, the transceiver 2405 is further configured to receive second instruction information transmitted by the first device. The second instruction information indicates the first receiving manner or the second receiving manner.

[0237] For details, please refer to the relevant contents in any of the embodiments of Figures 14 to 22. Details will not be repeated in this specification.

[0238] Optionally, the communication device 2400 may further include one or more of the following components: a wireless communication module, an audio module, an external memory interface, an internal memory, a universal serial bus (USB) interface, a power management module, an antenna, a speaker, a microphone, an input / output module, a sensor module, a motor, a camera, or a display, etc. It will be understood that in some embodiments, the communication device 2400 may include more or fewer components, or some components may be integrated, or some components may be divided. The components may be implemented by hardware, software, or a combination of software and hardware.

[0239] It should be noted that the communication device in the above embodiment may be a terminal device (or a network device), may be a circuit, may be a chip used in a terminal device (or a network device), or may be another composite device, component, etc. having the function of a terminal (or a network device). If the communication device is a terminal device (or a network device), the transceiver module may be a transceiver and may include an antenna, a radio frequency circuit, etc., and the processing module may be a processor, for example a central processing module (CPU). If the communication device is a component having the function of a terminal device or a network device, the transceiver module may be a radio frequency unit, and the processing module may be a processor. If the communication device is a chip system, the communication device may be a field programmable gate array (FPGA), an application specific integrated circuit (ASIC), a system on chip (SoC), a CPU, a network processor (NP), a digital signal processor (DSP), a micro controller unit (MCU), a programmable logic device (PLD), or another integrated chip. The processing module may be a processor of the chip system. The transceiver module or the communication interface may be an input / output interface or interface circuit of the chip system. For example, the interface circuit may be a code / data read / write interface circuit. The interface circuit may be configured to receive code instructions (the code instructions may be stored in a memory and read directly from the memory or read from the memory via another device) and send the code instructions to the processor.The processor may be configured to execute code instructions to perform the method of the above-mentioned method embodiments. In another example, the interface circuit may alternatively be a signal transmission interface circuit between the communication processor and the transceiver module.

[0240] When the communication device is a chip-type device or circuit, the device may include a transceiver unit and a processing unit. The transceiver unit may be an input / output circuit and / or a communication interface. The processing unit is an integrated processor, a microprocessor, or an integrated circuit.

[0241] The embodiment of the present application further provides a communication system. Specifically, the communication system includes at least one first device and at least one second device. For example, the communication system includes the second device and the first device configured to implement any one or more associated functions of Figures 14 to 22. For details, please refer to the related description of the embodiment of the method. Details will not be repeated in this specification.

[0242] An embodiment of the present application further provides a computer-readable storage medium containing instructions; when the instructions are executed on a computer, the computer is enabled to perform the method performed by the first device of Figure 14. Alternatively, when the instructions are executed on a computer, the computer is enabled to perform the method performed by the second device of Figure 14.

[0243] An embodiment of the present application further provides a computer program product including instructions; when the instructions are executed on a computer, the computer is enabled to perform the method performed by the first device of Figure 14. Alternatively, when the instructions are executed on a computer, the computer is enabled to perform the method performed by the second device of Figure 14.

[0244] An embodiment of the present application provides a chip system. The chip system includes a processor and may further include a memory configured to implement the function of the first device in the aforementioned method, or configured to implement the function of the second device in the aforementioned method. The chip system may include a chip, or may include a chip and another discrete device.

[0245] It should be understood that the sequence numbers of the above processes do not mean the execution order in various embodiments of the present application. The execution order of the processes should be determined according to the functions and internal logic of the processes, and should not be construed as any limitation on the implementation process of the embodiments of the present application.

[0246] Those skilled in the art will recognize that the illustrative logical blocks and steps described with reference to the embodiments disclosed herein can be implemented by electronic hardware, or a combination of computer software and electronic hardware. Whether a function is 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 functions described for each specific application, but the implementation should not be considered as going beyond the scope of this application.

[0247] For convenience of description, it will be clearly understood by those skilled in the art that the detailed operation processes of the above-mentioned systems, devices and units should be referred to the corresponding processes in the above-mentioned method embodiments, and the details will not be repeated in this specification.

[0248] In some embodiments provided in the present application, it should be understood that the disclosed system, device, and method can be implemented in other ways. For example, the described device embodiment is merely an example. For example, the division into units is merely a logical functional division, and other divisions may exist in actual implementation. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not implemented. In addition, the shown or discussed mutual couplings or direct couplings or communication connections may be implemented through some interfaces. Indirect couplings or communication connections between devices or units may be implemented in electronic, mechanical, or other forms.

[0249] The units described as separate parts may or may not be physically separate, and the parts shown as units may or may not be physical units, specifically, may be located in one location or distributed among multiple network units. Some or all of the units may be selected based on actual requirements to achieve the objectives of the solutions of the embodiments.

[0250] When a function is implemented in the form of a software functional unit and sold or used as an independent product, the function may be stored in a computer-readable storage medium. Based on the understanding, a part that essentially contributes to the technical solution of the present application or a part of the technical solution may be embodied in the form of a software product. The computer software product is stored in a storage medium and includes some instructions for enabling a computer device (which may be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the method of the embodiment of the present application. The aforementioned storage medium includes any medium that can store program code, such as a USB flash drive, a removable hard disk, a read-only memory (ROM), a RAM, a magnetic disk, or an optical disk.

[0251] It is obvious that those skilled in the art can make various modifications and variations to this application without departing from the scope of this application. This application is intended to cover these modifications and variations of this application as long as they fall within the scope of protection defined by the following claims and their equivalent technologies. [Explanation of symbols]

[0252] 2300 Communication Equipment 2310 Processing Module 2320 Transceiver Module 2400 Communication Equipment 2401 Processor 2402 Memory 2403 Command 2404 Command 2405 Transceiver 2406 Antenna

Claims

1. 1. A method for transmitting a signal, comprising: determining, by a first device, a first signal and a second signal; transmitting, by the first device, the first signal to a second device over a first frequency domain unit and the second signal over a second frequency domain unit, the first frequency domain unit including a first frequency and the second frequency domain unit including a second frequency, an absolute value of a difference between the first frequency and the second frequency is associated with one or more of the following: a first bandwidth, a second bandwidth, or a third bandwidth, the first bandwidth being a bandwidth occupied by the first frequency domain unit in the frequency domain, the second bandwidth being a bandwidth occupied by the second frequency domain unit in the frequency domain, the third bandwidth being a bandwidth occupied by a third frequency domain unit in the frequency domain, the third frequency domain unit being used by the first device to transmit a third signal to a third device, the first signal, the second signal, and the third signal being in one operating band; A signal transmission method comprising:

2. 2. The method of claim 1, wherein the first device transmits the first signal and the second signal within a frequency range corresponding to a channel bandwidth of the second device, and the absolute value of the difference between the first frequency and the second frequency is greater than or equal to 1 / 2 of the channel bandwidth of the second device.

3. 2. The method of claim 1, wherein the absolute value of the difference between the first frequency and the second frequency is greater than or equal to a sum of the third bandwidth and a fourth bandwidth, the fourth bandwidth being twice the sum of the first bandwidth and the second bandwidth, and the third signal is between the first frequency and the second frequency in the frequency domain.

4. 4. The method according to claim 1, wherein the absolute value of the difference between the first frequency and the second frequency is a preset value; or the method further comprises a step of transmitting, by the first device, first instruction information to the second device, the first instruction information indicating the absolute value.

5. 5. The method of claim 4, wherein the absolute value of the difference between the first frequency and the second frequency is the preset value, and the preset value is associated with one or more of the following: the operating band, a subcarrier spacing of the first signal, or a subcarrier spacing of the second signal.

6. 6. The method of claim 1, wherein at most one of the first signal and the second signal is used to provide a carrier for uplink transmission of the second device.

7. 7. The method of claim 1, wherein the power of the first signal is the same as the power of the second signal.

8. 8. The method of claim 7, wherein neither the first signal nor the second signal is used to provide a carrier for uplink transmissions of the second device.

9. 9. The method according to claim 1, wherein at least one of the first signal and the second signal is in a guard band of a first carrier and / or the absolute value of the difference between the first frequency and the second frequency is equal to or greater than a transmission bandwidth of one first carrier, and the first carrier is a New Radio NR carrier or a Long Term Evolution LTE carrier.

10. 10. The method of claim 9, wherein both the first signal and the second signal are in a transmission bandwidth of a second carrier, a difference between a minimum value of the first frequency domain unit and a lowest frequency of the transmission bandwidth is less than a first value, and a difference between a maximum value of the second frequency domain unit and a highest frequency of the transmission bandwidth is less than a second value.

11. a step of transmitting second instruction information by the first device to the second device, the second instruction information instructing the second device to receive a signal in a first receiving method or a second receiving method, the first receiving method instructing the second device to receive a signal based on the absolute value of the difference between the first frequency and the second frequency, and the second receiving method instructing the second device to receive a signal based on a frequency of a DC carrier wave and the absolute value of the difference between the first frequency and the second frequency; 11. The method of any one of claims 1 to 10, further comprising:

12. 1. A method for receiving a signal, comprising: receiving, by a second device, a first signal and a second signal by envelope detection, the first signal and the second signal being in an operating band; acquiring, by the second device, a target signal, the frequency carrying the target signal comprising an absolute value of a difference between a first frequency carrying the first signal and a second frequency carrying the second signal; A signal receiving method comprising:

13. The method of claim 12 , wherein the frequency carrying the target signal further comprises a frequency of a DC carrier.

14. Prior to the step of acquiring a target signal by the second device, the method further comprises: determining, by the second device, a receiving scheme to be used to acquire the target signal, the receiving scheme including a first receiving scheme or a second receiving scheme, the first receiving scheme instructing to receive a signal based on the absolute value of the difference between the first frequency and the second frequency, and the second receiving scheme instructing to receive a signal based on the frequency of the DC carrier wave and the absolute value of the difference between the first frequency and the second frequency; 14. The method of claim 12 or 13, further comprising:

15. The step of determining the first reception scheme or the second reception scheme by the second device includes: receiving, by the second device, second instruction information transmitted by the first device, the second instruction information instructing the first receiving scheme or the second receiving scheme; 15. The method of claim 14, comprising:

16. 16. The method of claim 12, wherein the absolute value of the difference between the first frequency and the second frequency is associated with one or more of the following: a first bandwidth, a second bandwidth, or a third bandwidth, where the first bandwidth is a bandwidth occupied by a first frequency domain unit in the frequency domain, the first frequency domain unit includes the first frequency, the second bandwidth is a bandwidth occupied by a second frequency domain unit in the frequency domain, the second frequency domain unit includes the second frequency, and the third bandwidth is a bandwidth occupied by a third frequency domain unit in the frequency domain, where the third frequency domain unit is used by the first device to transmit a third signal to a third device, the third signal being in the operating band.

17. 17. The method of claim 16, wherein the first signal and the second signal are transmitted within a frequency range corresponding to a channel bandwidth of the second device, and the absolute value of the difference between the first frequency and the second frequency is greater than or equal to ½ of the channel bandwidth of the second device.

18. 17. The method of claim 16, wherein the absolute value of the difference between the first frequency and the second frequency is greater than or equal to a sum of the third bandwidth and a fourth bandwidth, the fourth bandwidth being twice the sum of the first bandwidth and the second bandwidth, and the third signal is between the first frequency and the second frequency in the frequency domain.

19. 19. The method according to claim 12, wherein the absolute value of the difference between the first frequency and the second frequency is a preset value; or the method further comprises a step of receiving, by the second device, first instruction information transmitted by the first device, the first instruction information indicating the absolute value.

20. 20. The method of claim 19, wherein the absolute value of the difference between the first frequency and the second frequency is the preset value, and the preset value is associated with one or more of the following: the operating band, a subcarrier spacing of the first signal, or a subcarrier spacing of the second signal.

21. 21. The method of claim 12, wherein at most one of the first signal and the second signal is used to provide a carrier for uplink transmission of the second device.

22. 22. The method of claim 12, wherein the power of the first signal is the same as the power of the second signal.

23. 23. The method of claim 22, wherein neither the first signal nor the second signal is used to provide a carrier for uplink transmissions of the second device.

24. 24. The method according to claim 12, wherein at least one of the first signal and the second signal is in a guard band of a first carrier and / or the absolute value of the difference between the first frequency and the second frequency is equal to or greater than a transmission bandwidth of a first carrier, and the first carrier is a new radio NR carrier or an LTE carrier.

25. 17. The method of claim 16, wherein both the first signal and the second signal are in a transmission bandwidth of a second carrier, a difference between a minimum value of the first frequency unit and a lowest frequency of the transmission bandwidth is less than a first value, and a difference between a maximum value of the second frequency domain unit and a highest frequency of the transmission bandwidth is less than a second value.

26. 1. A communications device, comprising: a processing module and a transceiver module, the processing module configured to determine a first signal and a second signal; the transceiver module is configured to transmit the first signal to a second device over a first frequency domain unit and transmit the second signal over a second frequency domain unit, the first frequency domain unit comprising a first frequency and the second frequency domain unit comprising a second frequency, an absolute value of a difference between the first frequency and the second frequency is associated with one or more of the following: a first bandwidth, a second bandwidth, or a third bandwidth, the first bandwidth being a bandwidth occupied by the first frequency domain unit in the frequency domain, the second bandwidth being a bandwidth occupied by the second frequency domain unit in the frequency domain, the third bandwidth being a bandwidth occupied by the third frequency domain unit in the frequency domain, the third signal being a signal transmitted by the first device to a third device over the third frequency domain unit, the first signal, the second signal, and the third signal are in one operating band; Communications equipment.

27. 27. The apparatus of claim 26, wherein the transceiver module transmits the first signal and the second signal within a frequency range corresponding to a channel bandwidth of the second device, and an absolute value of the difference between the first frequency and the second frequency is greater than or equal to ½ of the channel bandwidth of the second device.

28. 27. The apparatus of claim 26, wherein the absolute value of the difference between the first frequency and the second frequency is greater than or equal to a sum of the third bandwidth and a fourth bandwidth, the fourth bandwidth being twice the sum of the first bandwidth and the second bandwidth, and the third signal is between the first frequency and the second frequency in the frequency domain.

29. 29. The apparatus of claim 26, wherein the absolute value of the difference between the first frequency and the second frequency is a preset value; or the transceiver module is further configured to transmit first instruction information to the second device, the first instruction information indicating the absolute value.

30. 30. The apparatus of claim 29, wherein the absolute value of the difference between the first frequency and the second frequency is the preset value, the preset value being associated with one or more of the following: the operating band, a subcarrier spacing of the first signal, or a subcarrier spacing of the second signal.

31. 30. The apparatus of claim 26, wherein at most one of the first signal and the second signal is used to provide a carrier for uplink transmission of the second device.

32. 32. An apparatus according to any one of claims 26 to 31, wherein the power of the first signal is the same as the power of the second signal.

33. 33. The apparatus of claim 32, wherein neither the first signal nor the second signal is used to provide a carrier for uplink transmissions of the second device.

34. 34. The apparatus of claim 26, wherein at least one of the first signal and the second signal is in a guard band of a first carrier and / or the absolute value of the difference between the first frequency and the second frequency is equal to or greater than a transmission bandwidth of a first carrier, and the first carrier is a new radio NR carrier or a long term evolution LTE carrier.

35. 35. The apparatus of claim 34, wherein both the first signal and the second signal are in a transmission bandwidth of a second carrier, a difference between a minimum value of the first frequency domain unit and a lowest frequency of the transmission bandwidth is less than a first value, and a difference between a maximum value of the second frequency domain unit and a highest frequency of the transmission bandwidth is less than a second value.

36. The transceiver module includes: transmitting second instruction information to the second device, the second instruction information instructing the second device to receive a signal in a first receiving method or a second receiving method, the first receiving method instructing the second device to receive a signal based on the absolute value of the difference between the first frequency and the second frequency, and the second receiving method instructing the second device to receive a signal based on a frequency of a DC carrier wave and the absolute value of the difference between the first frequency and the second frequency; 36. The apparatus of any one of claims 26 to 35, further configured to:

37. A communications device including a processing module and a transceiver module, the transceiver module configured to receive a first signal and a second signal through envelope detection, the first signal and the second signal being in an operating band; and The processing module is configured to obtain a target signal, the frequency carrying the target signal comprising an absolute value of a difference between a first frequency carrying the first signal and a second frequency carrying the second signal. Communications equipment.

38. 38. The apparatus of claim 37, wherein the frequency carrying the target signal further comprises a DC carrier frequency.

39. 39. The apparatus of claim 37 or 38, wherein before the processing module acquires the target signal, the processing module is further configured to determine a receiving scheme to be used to acquire the target signal, the receiving scheme comprising a first receiving scheme or a second receiving scheme, the first receiving scheme indicating receiving a signal based on the absolute value of the difference between the first frequency and the second frequency, and the second receiving scheme indicating receiving a signal based on the frequency of the DC carrier wave and the absolute value of the difference between the first frequency and the second frequency.

40. The transceiver module includes: receiving second instruction information transmitted by the first device, the second instruction information instructing the first receiving method or the second receiving method; 39. Apparatus according to claim 37 or 38, specifically adapted for:

41. 41. The apparatus of claim 37, wherein the absolute value of the difference between the first frequency and the second frequency is associated with one or more of the following: a first bandwidth, a second bandwidth, or a third bandwidth, where the first bandwidth is a bandwidth occupied by a first frequency domain unit in the frequency domain, the first frequency domain unit includes the first frequency, the second bandwidth is a bandwidth occupied by a second frequency domain unit in the frequency domain, the second frequency domain unit includes the second frequency, and the third bandwidth is a bandwidth occupied by a third frequency domain unit in the frequency domain, and the third frequency domain unit is used by the first device to transmit a third signal to a third device, the third signal being in the operating band.

42. 42. The apparatus of claim 41, wherein the first signal and the second signal are transmitted within a frequency range corresponding to a channel bandwidth of the communication device, and the absolute value of the difference between the first frequency and the second frequency is greater than or equal to 1 / 2 of the channel bandwidth of the communication device.

43. 42. The apparatus of claim 41, wherein the absolute value of the difference between the first frequency and the second frequency is greater than or equal to a sum of the third bandwidth and a fourth bandwidth, the fourth bandwidth being twice the sum of the first bandwidth and the second bandwidth, and the third signal is between the first frequency and the second frequency in the frequency domain.

44. 44. The apparatus of any one of claims 37 to 43, wherein the absolute value of the difference between the first frequency and the second frequency is a preset value; or the transceiver module is further configured to receive first instruction information transmitted by the first device, the first instruction information indicating the absolute value.

45. 45. The apparatus of claim 44, wherein the absolute value of the difference between the first frequency and the second frequency is the preset value, the preset value being associated with one or more of the following: the operating band, a subcarrier spacing of the first signal, or a subcarrier spacing of the second signal.

46. 46. ​​The apparatus of claim 37, wherein at most one of the first signal and the second signal is used to provide a carrier for uplink transmissions of the communications device.

47. 47. An apparatus according to any one of claims 37 to 46, wherein the power of the first signal is the same as the power of the second signal.

48. 48. The apparatus of claim 37, wherein none of the first signal and the second signal are used to provide a carrier for uplink transmissions of the communications device.

49. 49. The apparatus of claim 37, wherein at least one of the first signal and the second signal is in a guard band of a first carrier, and / or the absolute value of the difference between the first frequency and the second frequency is equal to or greater than a transmission bandwidth of a first carrier, and the first carrier is a new radio NR carrier or an LTE carrier.

50. 42. The apparatus of claim 41, wherein both the first signal and the second signal are in a transmission bandwidth of a second carrier, a difference between a minimum value of the first frequency unit and a lowest frequency of the transmission bandwidth is less than a first value, and a difference between a maximum value of the second frequency domain unit and a highest frequency of the transmission bandwidth is less than a second value.

51. A communications device comprising a processor and a memory, the memory configured to store a computer program, and the processor configured to execute the computer program stored in the memory to enable the communications device to perform a method according to any one of claims 1 to 11 or to enable the communications device to perform a method according to any one of claims 12 to 25.

52. 52. The communication device of claim 51, wherein the communication device is a chip or a chip system.

53. A computer readable storage medium, the computer readable storage medium storing a computer program, the computer program being executed by a computer to enable the computer to perform the method according to any one of claims 1 to 11, or the computer being enabled to perform the method according to any one of claims 12 to 25.

54. 26. A computer program product, the computer program product storing a computer program; when the computer program is executed by a computer, the computer is enabled to carry out the method according to any one of claims 1 to 11, or the computer program product is enabled to carry out the method according to any one of claims 12 to 25.

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