Wireless communication device and system

Abstract

The invention provides a wireless communication device and system, the device comprises a transmitting channel, a receiving channel and a reference channel, the reference channel comprises a coupling component and a frequency shift component, the coupling component is used for coupling a first analog signal transmitted by the corresponding transmitting channel to obtain a reference analog signal; the frequency shift component is used for performing frequency shift on the reference analog signal to obtain a reference analog signal after frequency shift; the frequency-shifted reference analog signals are combined into at least one receiving channel; wherein the reference analog signal after frequency shift is used for offsetting interference in the second analog signal received by the receiving channel. According to the embodiment of the invention, self-interference suppression can be realized at relatively low resource cost.

Description

Technical Field

[0001] The present disclosure relates to the field of communication technology, and in particular to a wireless communication device and system. Background Art

[0002] With the application and development of communication technology, personal communication services have grown rapidly, and the demand for spectrum resources has increased rapidly. Therefore, in recent years, full-duplex technology with simultaneous transmission and reception in the same frequency, and full-duplex technology with simultaneous transmission and reception in adjacent sub-bands have become research hotspots in the field of wireless communication.

[0003] Wireless full-duplex technology can achieve simultaneous reception and transmission operations on the same wireless channel. In theory, the spectrum efficiency of wireless full-duplex technology is twice that of frequency division duplex FDD technology or time division duplex TDD technology. However, full-duplex technology will cause strong interference to the local receiver while transmitting signals, which is called "self-interference". Therefore, how to suppress self-interference in full-duplex or sub-band full-duplex systems is the biggest problem that full-duplex technology needs to solve in practical applications. Summary of the invention

[0004] The present disclosure provides a wireless communication device and system, which can suppress self-interference at a relatively low resource cost.

[0005] In a first aspect, an embodiment of the present disclosure provides a wireless communication device, comprising a transmitting channel, a receiving channel and a reference channel, wherein the reference channel comprises a coupling component and a frequency shifting component, wherein the coupling component is used to couple a first analog signal transmitted by the corresponding transmitting channel to obtain a reference analog signal; the frequency shifting component is used to frequency shift the reference analog signal to obtain a frequency-shifted reference analog signal; the frequency-shifted reference analog signal is combined into at least one receiving channel; wherein the frequency-shifted reference analog signal is used to offset interference in a second analog signal received by the receiving channel.

[0006] In a second aspect, an embodiment of the present disclosure provides a wireless communication system, which includes the above-mentioned wireless communication device.

[0007] According to the embodiment of the present disclosure, the wireless communication device is provided with a reference channel. The reference channel couples the transmitting channel to a reference analog signal for canceling interference through a coupling component, shifts the frequency of the reference analog signal through a frequency shifting component, and combines it into a receiving channel, thereby realizing multiplexing of the receiving channel and the reference channel, thereby significantly reducing the channel resources increased by interference cancellation and saving the overall cost and volume of the wireless communication device. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] In the accompanying drawings of the embodiments of the present disclosure:

[0009] Figure 1a , Figure 1b and Figure 1c A schematic diagram of a wireless communication structure of a related technology;

[0010] Figure 2 A schematic diagram of a wireless communication device provided in an embodiment of the present disclosure;

[0011] Figure 3 A schematic diagram of a wireless communication device provided in an embodiment of the present disclosure;

[0012] Figure 4a A schematic diagram of a wireless communication device provided in an embodiment of the present disclosure;

[0013] Figure 4b A schematic diagram of a processing process of a wireless communication device provided by an embodiment of the present disclosure;

[0014] Figure 5a A schematic diagram of a wireless communication device provided in an embodiment of the present disclosure;

[0015] Figure 5b A schematic diagram of a processing process of a wireless communication device provided by an embodiment of the present disclosure;

[0016] Figure 6a A schematic diagram of a wireless communication device provided in an embodiment of the present disclosure;

[0017] Figure 6b A schematic diagram of a processing process of a wireless communication device provided in an embodiment of the present disclosure. DETAILED DESCRIPTION

[0018] In order to enable those skilled in the art to better understand the technical solution of the present disclosure, the wireless communication device provided by the embodiment of the present disclosure is described in detail below with reference to the accompanying drawings.

[0019] The present disclosure will be described more fully below with reference to the accompanying drawings, but the embodiments shown may be embodied in different forms, and the present disclosure should not be construed as being limited to the embodiments set forth below. On the contrary, the purpose of providing these embodiments is to make the present disclosure thorough and complete, and will enable those skilled in the art to fully understand the scope of the present disclosure.

[0020] The accompanying drawings of the embodiments of the present disclosure are used to provide a further understanding of the embodiments of the present disclosure, and constitute a part of the specification, and are used together with the detailed embodiments to explain the present disclosure, and do not constitute a limitation of the present disclosure. By describing the detailed embodiments with reference to the accompanying drawings, the above and other features and advantages will become more apparent to those skilled in the art.

[0021] The present disclosure may be described with reference to plan views and / or cross-sectional views by means of ideal schematic views of the present disclosure. Therefore, the exemplary illustrations may be modified according to manufacturing techniques and / or tolerances.

[0022] In the absence of conflict, the various embodiments of the present disclosure and the various features therein may be combined with each other.

[0023] The terms used in the present disclosure are only used to describe specific embodiments and are not intended to limit the present disclosure. The term "and / or" as used in the present disclosure includes any and all combinations of one or more related enumerated items. The singular forms "one" and "the" as used in the present disclosure are also intended to include plural forms, unless the context clearly indicates otherwise. The terms "including", "made of..." as used in the present disclosure specify the presence of the features, wholes, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components and / or groups thereof.

[0024] Unless otherwise defined, all terms (including technical and scientific terms) used in this disclosure have the same meaning as commonly understood by those of ordinary skill in the art. It will also be understood that terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with their meaning in the context of the relevant art and this disclosure, and will not be interpreted as having an idealized or overly formal meaning unless explicitly defined in this disclosure.

[0025] The present disclosure is not limited to the embodiments shown in the drawings, but includes modifications of the configurations formed based on the manufacturing process. Therefore, the regions illustrated in the drawings have schematic properties, and the shapes of the regions shown in the drawings illustrate the specific shapes of the regions of the elements, but are not intended to be limiting.

[0026] In base station full-duplex and sub-band full-duplex scenarios, the transmitted signal, the nonlinear products of the transmitted signal, and the transmit noise floor fall within the receiving frequency band, becoming in-band interference signals of the received signal, seriously affecting the sensitivity index of the received signal. In related technologies, the self-interference suppression technology of the simultaneous co-frequency full-duplex system can be mainly divided into three directions: self-interference suppression in the spatial domain, analog domain, and digital domain.

[0027] Figure 1a , Figure 1b and Figure 1c FIG. 1 is a schematic diagram of a wireless communication structure of a related technology. Figure 1a As shown, the structure includes a transmitting part and a receiving part. The transmitting part includes a transmitting antenna, a transmitting link, and a digital-to-analog converter; the receiving part includes a receiving antenna, an analog self-interference suppression module or a digital self-interference suppression module, a receiving link, an analog-to-digital converter, and is connected to a baseband module (not shown) through a digital link for subsequent processing. Figure 1aThe structure shown can perform self-interference suppression in the analog domain and / or the digital domain.

[0028] In the related art, a self-interference cancellation scheme in the digital domain can be used in full-duplex and sub-band full-duplex. Digital domain self-interference cancellation (also known as algorithm cancellation) uses the self-interference signal as a reference source to estimate the channel, nonlinear characteristics and other parameters of the self-interference signal in the digital domain and cancel them out. Due to the differences in channel parameters, noise floor and other indicators of each channel, the digital domain self-interference cancellation of the related art must see the interference signal and noise floor of each channel and cancel them out in the digital domain. Therefore, the reference signal acquisition process of the related art requires an additional receiving link.

[0029] like Figure 1b As shown, the structure adds a reference receiving channel 1-M on the basis of the receiving channel 1-M (including receiving antenna, duplexer, receiving link, analog-to-digital converter, etc., M is an integer greater than or equal to 1) and the transmitting channel 1-M (including transmitting antenna, duplexer, transmitting link, digital-to-analog converter, etc.), and each reference receiving channel includes a coupler, a reference receiving link, an analog-to-digital converter, and a matching power supply and control link (not shown), etc.; the digital signals of the receiving channel and the reference receiving channel are input to the digital self-interference suppression part for interference cancellation processing, and the processed signals are sent to the next-level baseband module (not shown) through a digital link. This structure significantly increases the complexity and cost of single-board implementation, which greatly hinders the implementation of algorithm cancellation technology products.

[0030] In the related art, a time-division multiplexing self-interference cancellation scheme may also be used in full-duplex and sub-band full-duplex to reduce the number of reference receiving channels.

[0031] Figure 1c FIG. 1 is a schematic diagram of a wireless communication structure of a related technology. Figure 1c As shown, the structure adds a reference receiving channel (including a coupler, a reference receiving link, and an analog-to-digital converter) on the basis of the receiving channel 1-M (including a receiving antenna, a duplexer, a receiving link, an analog-to-digital converter, etc.) and the transmitting channel 1-M (including a transmitting antenna, a duplexer, a transmitting link, a digital-to-analog converter, etc.), and the coupler obtains the coupling signals of each transmitting channel in a time-division multiplexing manner (including channel 1 coupling signal, channel 2 coupling signal, ..., channel M coupling signal). The digital signals of the receiving channel and the reference receiving channel are input into the digital self-interference suppression part for interference cancellation processing, and the processed signals are sent to the baseband module (not shown) of the next level through the digital link.

[0032] However, since the noise floor is random, there is no way to calculate it by building a channel model. This solution is not applicable when the noise floor in the transmitted interference signal is higher than the received noise floor. According to measured data, in most base station application scenarios, the noise floor of the transmitted leakage to the receiving channel is higher than the noise floor of the receiving channel itself. It is necessary to extract the self-interference signal in real time to offset it for the algorithm. Figure 1c The solution of time-division multiplexing reference channel is not suitable for full-duplex application of base station.

[0033] In view of this, according to an embodiment of the present disclosure, a wireless communication device is proposed, which utilizes the idea of ​​frequency division to realize multiplexing between a normal receiving channel and a reference receiving channel in the wireless communication device, simplifies the additional receiving channels required for digital domain self-interference cancellation, and reduces the added channel resources. Therefore, in the scenario of base station full-duplex or sub-band full-duplex, it is possible to significantly save the overall cost and volume of the wireless communication device, improve product competitiveness, and promote the commercialization of digital domain self-interference cancellation in products.

[0034] Figure 2 A schematic diagram of a wireless communication device provided in an embodiment of the present disclosure.

[0035] like Figure 2 As shown, the wireless communication device 20 according to the embodiment of the present disclosure includes: a transmitting channel 21, a receiving channel 22 and a reference channel 23,

[0036] The reference channel 23 includes a coupling component 231 and a frequency shifting component 232. The coupling component 231 is used to couple the first analog signal A1 transmitted by the corresponding transmitting channel to obtain a reference analog signal A3; the frequency shifting component 232 is used to frequency shift the reference analog signal A3 to obtain a frequency-shifted reference analog signal A4; the frequency-shifted reference analog signal A4 is combined into at least one receiving channel;

[0037] The frequency-shifted reference analog signal A4 is used to offset interference in the second analog signal A2 received by the receiving channel.

[0038] For example, the wireless communication device according to the embodiment of the present disclosure can be applied to the scenario of base station full-duplex or sub-band full-duplex, that is, the wireless communication device can be a full-duplex communication device or a sub-band full-duplex communication device of the base station.

[0039] In some possible implementations, the transmission channel 21 may be one or more, i.e., including transmission channels 1-N (N≥1), which are used to transmit service signals of different frequency ranges (referred to as the first analog signal A1). Each transmission channel includes a digital-to-analog converter, a transmission link (including up-converter, amplifier, attenuator, final power amplifier, filter and other components) and a transmission antenna (TX ANT), etc. It should be understood that the transmission channel can adopt any transmission channel structure of the base station in the relevant technology, and the present disclosure does not limit this. In addition, the number of channels N is, for example, 4, 8, 12, 16, etc., and the present disclosure does not limit the specific value of N.

[0040] In some possible implementations, the receiving channel 22 may correspond to the transmitting channel 21, that is, it includes receiving channels 1-N, which are used to receive service signals of different frequency ranges (referred to as the second analog signal A2). Each receiving channel includes an analog-to-digital converter, a receiving link (including attenuators, multi-stage low noise amplifiers, down converters, multi-stage filters and other components), and a receiving antenna (RX ANT), etc. It should be understood that the receiving channel can adopt any receiving channel structure of the base station in the relevant technology, and the present disclosure does not limit this.

[0041] In some possible implementations, the second analog signal of the nth (1≤n≤N) receiving channel and the first analog signal of the nth transmitting channel are in the same frequency range, the frequency ranges overlap, or the frequency ranges are adjacent. That is to say, in a full-duplex scenario, the frequency ranges of the second analog signal and the first analog signal of the corresponding receiving channel and the transmitting channel are the same; in a sub-band full-duplex scenario, the frequency ranges of the second analog signal and the first analog signal of the corresponding receiving channel and the transmitting channel overlap, or the frequency ranges are adjacent. The following will be explained using the example that the corresponding second analog signal and the first analog signal have the same frequency range, but it should be understood that those skilled in the art can set the frequency ranges of the second analog signal and the first analog signal according to actual conditions, and the present disclosure does not limit this.

[0042] In some possible implementations, the wireless communication device 20 is provided with a reference channel 23 corresponding to the transmitting channel 21, i.e., including reference channels 1-N, for respectively acquiring reference analog signals of the transmitting channels 1-N so as to offset interference in the second analog signal received by the receiving channel.

[0043] In some possible implementations, the reference channels 1-N are connected to at least one receiving channel. The reference channels 1-N may be connected to the receiving channels 1-N respectively, or may be connected to one of the receiving channels 1-N, or may be connected to an additional N+1th receiving channel. The present disclosure does not limit the specific connection method between the reference channels 1-N and the receiving channels.

[0044] In some possible implementations, each reference channel includes a coupling component 231 (including a coupler, a filter, etc.) and a frequency shift component 232 (including a mixer, a filter, etc.), and the coupling component 231 is used to couple the first analog signal transmitted by the corresponding transmission channel to obtain a reference analog signal A3. The reference analog signal of the reference channel n includes the self-interference in-band signal, the self-interference nonlinear signal, and the self-interference noise floor signal of the first analog signal of the transmission channel n coupled thereto.

[0045] In the example, let the signal size of the first analog signal of the transmitting channel n be a, the working center frequency be f, and the bandwidth be BW, that is, the frequency range of the first analog signal (also referred to as the output passband) is f-BW / 2 to f+BW / 2; the size of the nonlinear product (nonlinear signal) of the first analog signal is b, where the frequency range of the third-order nonlinear product is between f-3 / 2BW and f+3 / 2BW; the background noise signal in the output passband is c. The reference channel n couples the transmitting channel n, and after subtracting the coupling degree of the coupler, the output reference analog signal includes the self-interference in-band signal a1, the self-interference nonlinear signal b1, and the self-interference background noise signal c1. Those skilled in the art should understand that the reference analog signal can be determined according to the calculation method in the relevant technology or by testing, and the present disclosure does not limit the specific method of determining the reference analog signal.

[0046] In some possible implementations, the frequency shifting component 232 is used to shift the frequency of the reference analog signal A3 to obtain a frequency-shifted reference analog signal A4; the frequency-shifted reference analog signal A4 is combined into at least one receiving channel, and the frequency-shifted reference analog signal A4 is used to cancel the interference in the second analog signal received by the receiving channel. In this way, the signal of the reference channel is combined with the received signal of the receiving channel at the analog signal stage, thereby significantly reducing the channel resources increased by interference cancellation.

[0047] Among them, when multiple frequency-shifted reference analog signals are respectively combined into each normal receiving channel, the frequency range of the frequency-shifted reference analog signal is different from the frequency range of the second analog signal of the corresponding receiving channel, so that the reference signal and the receiving signal can be separated from the combined analog signal in subsequent processing; when multiple frequency-shifted reference analog signals are all combined into a certain receiving channel, the frequency range of each frequency-shifted reference analog signal is different from the frequency range of the second analog signal of the receiving channel, so that each reference signal and the receiving signal of the receiving channel can be separated from the combined analog signal in subsequent processing; when multiple frequency-shifted reference analog signals are combined into an additional receiving channel, the frequency range of each frequency-shifted reference analog signal is different, so that each reference signal can be separated from the combined analog signal in subsequent processing. The present disclosure does not limit the specific frequency range of the frequency-shifted reference analog signal.

[0048] In some possible implementations, the combined signal can be converted from analog to digital in the receiving channel, and in subsequent processing, the received service signal and the reference signal used for cancellation are separated, and then interference cancellation processing is performed on the separated service signal and reference signal based on a preset interference cancellation algorithm, and the cancelled digital signal is output, thereby realizing the entire process of interference cancellation.

[0049] In some possible implementations, the digital frequency shift component and the digital cancellation component are connected to each receiving channel, and the service signal received in the second digital signal and the reference signal used for cancellation are separated by the digital frequency shift component, and then the digital cancellation component performs interference cancellation processing on the separated service signal and reference signal based on a preset interference cancellation algorithm, and outputs a third digital signal after cancellation. It should be understood by those skilled in the art that the interference cancellation algorithm in the related art can be adopted, and the present disclosure does not limit the specific type of the interference cancellation algorithm adopted.

[0050] In some possible implementations, the wireless communication device according to the embodiment of the present disclosure further includes a digital link (including an uplink digital link and a downlink digital link, not shown in the figure). The baseband component is connected to the transmission channel and the receiving channel respectively through the digital link for sending and receiving baseband data. The baseband component sends the first digital signal to the transmission channel through the downlink digital link so that the transmission channel transmits the first analog signal; it also receives the third digital signal after cancellation through the uplink digital link, and performs sensitivity demodulation processing on the third digital signal.

[0051] According to an embodiment of the present disclosure, a reference channel is set in a wireless communication device, and a transmission channel is coupled to a reference analog signal for canceling interference through a coupling component of the reference channel. The reference analog signal is frequency-shifted through a frequency-shifting component of the reference channel and combined into a receiving channel, thereby realizing multiplexing of the receiving channel and the reference channel, thereby significantly reducing the channel resources increased by interference cancellation and saving the overall cost and volume of the wireless communication device.

[0052] The wireless communication device according to the embodiment of the present disclosure is described below.

[0053] Figure 3 A schematic diagram of a wireless communication device provided in an embodiment of the present disclosure.

[0054] like Figure 3 As shown, the wireless communication device according to the embodiment of the present disclosure includes: a transmitting channel 31, a receiving channel 32, and a reference receiving channel 33; it also includes a digital frequency shift component 341, a digital cancellation component 342, and a baseband component 35.

[0055] For example, the transmission channel 31 includes transmission channels 1-N, which are respectively used to transmit service signals in different frequency ranges. Any transmission channel n (1≤n≤N) includes a digital-to-analog converter, a transmission link (including up-converter, amplifier, attenuator, final power amplifier, filter and other devices) and a transmission antenna (TX ANT) and other components (not shown in the figure). The present disclosure does not limit the specific devices included in the transmission channel.

[0056] In some possible implementations, the transmission channel n may receive the first digital signal from the baseband component 35 through a digital link (not shown in the figure), and after being processed by a series of components of the transmission channel n, transmit the first analog signal through the transmission antenna. The frequency ranges of the first analog signals transmitted by the N transmission channels are different, that is, each transmission channel is used to transmit the first analog signal in a different frequency range, and the present disclosure does not limit the specific frequency range corresponding to each first analog signal.

[0057] In some possible implementations, the receiving channel 32 includes receiving channels 1-N corresponding to the transmitting channels 1-N, and the receiving channels 1-N are respectively used to receive service signals of different frequency bands. Any receiving channel n includes a pre-processing component 321, a combining component 322, and an amplifying and converting component 323. Among them, the pre-processing component 321 can be one or more of the receiving antenna (RX ANT), filter, low noise amplifier and other devices; the combining component 322 includes a combiner, and even includes devices such as filters; the amplifying and converting component 323 can be one or more of the down converter, low noise amplifier, attenuator and other devices. The present disclosure does not limit the specific devices included in the various components of the receiving channel.

[0058] In some possible implementations, the receiving channel n can receive the second analog signal of the corresponding frequency range through the preprocessing component 321, and obtain the processed second digital signal after being processed by a series of components of the receiving channel n, and output the second digital signal to the digital frequency shift component 341 and the digital cancellation component 342 for further processing. Among them, the frequency ranges of the second analog signals received by the N receiving channels are different, that is, each receiving channel is used to receive the second analog signal in a different frequency range, and the present disclosure does not limit the specific frequency range corresponding to each second analog signal.

[0059] In some possible implementations, the reference channel 33 includes reference channels 1-N corresponding to the transmission channels 1-N of the transmission component, and is used to obtain reference analog signals of the transmission channels 1-N respectively. The reference channel n includes a coupling component 331 and a frequency shift component 332, which couples the reference analog signal required for algorithm cancellation from the transmission channel n by coupling. Among them, the coupling component 331 may include a coupler and a filter, etc.; the frequency shift component 332 may include a mixer and a filter, etc. The present disclosure does not limit the specific devices included in the various components of the reference channel.

[0060] In some possible implementations, the reference channel n can frequency-shift the reference analog signal and combine it into the receiving channel, so that the signal of the reference channel is combined with the signal of the receiving channel at the analog signal stage, and the combined signal is processed by the receiving channel to output a second digital signal.

[0061] In some possible implementations, the digital frequency shift component 341 is connected to the receiving channel 32, the digital cancellation component 342 is connected to the digital frequency shift component 341, the service signal received in the second digital signal and the reference signal for cancellation are separated by the digital frequency shift component 341, and then the digital cancellation component 342 performs interference cancellation processing on the separated service signal and reference signal based on a preset interference cancellation algorithm, and outputs the third digital signal after cancellation. It should be understood by those skilled in the art that the interference cancellation algorithm in the related art can be adopted, and the present disclosure does not limit the specific type of the interference cancellation algorithm adopted.

[0062] In some possible implementations, the wireless communication device according to the embodiment of the present disclosure further includes a baseband component 35 and a digital link (including an uplink digital link and a downlink digital link, not shown in the figure). The baseband component 35 is connected to the transmitting channel 31 and the receiving channel 32 respectively through the digital link for sending and receiving baseband data. The baseband component 35 sends the first digital signal to the transmitting channel through the downlink digital link so that the transmitting channel transmits the first analog signal; it also receives the N-channel third digital signal after cancellation of the digital frequency shift component through the uplink digital link, and performs sensitivity demodulation processing on the third digital signal. In this way, the entire sending and receiving processing of wireless communication can be completed.

[0063] In some possible implementations, the wireless communication device according to the embodiment of the present disclosure further includes a signal generator 333 ( Figure 2 The signal generator 333 is used to generate mixing signals corresponding to the N reference channels, that is, to generate the local oscillator signal required for frequency shifting. The frequency shifting component shifts the frequency of the reference analog signal based on the mixing signal to obtain the reference analog signal after frequency shifting.

[0064] In some possible implementations, the number of the transmitting channels, the receiving channels, and the reference channels are all N, and the N reference channels are respectively connected to the corresponding N receiving channels, where N is an integer and N≥1.

[0065] Figure 4a A schematic diagram of a wireless communication device provided in an embodiment of the present disclosure. Figure 4a A wireless communication device with N transmission and N reception is shown, wherein there are N transmission channels, N reception channels and N reference channels. The N reference channels are respectively connected to the corresponding N reception channels. N is any integer greater than 1.

[0066] In some possible implementations, at least one receiving channel includes a preprocessing component 421, a combining component 422, and an amplifying and converting component 423; the preprocessing component 421 is used to receive the second analog signal and output a preprocessed third analog signal;

[0067] The combining component 422 is connected to the pre-processing component 421 and the frequency shifting component 432 of the corresponding reference channel, and is used to combine the third analog signal and the frequency-shifted reference analog signal of the corresponding reference channel, and output a combined fourth analog signal;

[0068] The amplifying and converting component 423 is connected to the combining component 422, and is used to amplify and perform analog-to-digital conversion on the fourth analog signal, and output the second digital signal of the receiving channel.

[0069] For example, in Figure 4a In the figure, the baseband component 45 sends the baseband signal (i.e., the first digital signal) to the transmission channels 1-N respectively through a downlink digital link (not shown in the figure), and after being processed by a series of components of the transmission channel (such as digital-to-analog converter DAC, amplifier, final power amplifier, filter and other devices), N first analog signals are transmitted through the transmitting antenna, and the frequency range of each first analog signal is different.

[0070] exist Figure 4a In the embodiment, the digital-to-analog converter DAC included in the transmitting channels 1-N and the analog-to-digital converter ADC of the amplifying and converting component 423 in the receiving channels 1-N are both implemented by the 4T4R transceiver integrated chip. It should be understood that those skilled in the art can implement the DAC and ADC by any type of chip / device according to actual conditions, and the present disclosure does not limit this.

[0071] In some possible implementations, the reference channel includes reference channels 1-N corresponding to the transmit channels 1-N. For any one of the reference channels 1-N, the reference channel includes a coupling component 431 and a frequency shift component 432. The coupling component 431 may include components such as a coupler and a filter. The coupler is used to couple with the transmit channel corresponding to the reference channel, and the filter is used to filter the coupled signal, filter out other background noise and interference signals outside the frequency range of the self-interference signal, and output a reference analog signal corresponding to the transmit channel.

[0072] In the example, let the signal size of the first analog signal of the transmitting channel be a, the first center frequency of operation be f, and the bandwidth be BW, that is, the frequency range of the first analog signal (also referred to as the output passband) is f-BW / 2 to f+BW / 2; the size of the nonlinear product (nonlinear signal) of the first analog signal is b, where the frequency range of the third-order nonlinear product is between f-3 / 2BW and f+3 / 2BW; the background noise signal in the output passband is c. The reference channel n couples the transmitting channel n, and after subtracting the coupling degree of the coupler, the output reference analog signal includes the self-interference in-band signal a1, the self-interference nonlinear signal b1, and the self-interference background noise signal c1. Those skilled in the art should understand that the reference analog signal can be determined according to the calculation method in the relevant technology or by testing, and the present disclosure does not limit the specific method of determining the reference analog signal.

[0073] In some possible implementations, the frequency shifting component 432 is connected to the coupling component 431 and the signal generator 433, and is used to shift the frequency of the reference analog signal and the mixing signal, and output the reference analog signal after the frequency shifting. The frequency shifting component 432 may include a mixer and a filter (not shown in the figure), the mixer is used to mix the reference analog signal with the mixing signal from the signal generator, and the filter is used to filter the mixed signal, filter out other background noise and interference signals outside the frequency range of the self-interference signal, and output the reference analog signal after the frequency shifting.

[0074] In the example, assuming that the frequency of the mixing signal of the signal generator is f0 and the working center frequency of the first analog signal is f, the frequency of the mixed signal is f-f0, the frequency range of the third-order nonlinear signal is between f-3 / 2BW-f0 and f+3 / 2BW-f0, and the background noise will also be moved to the frequency range corresponding to f-f0. After the mixed signal is filtered, the output frequency-shifted reference analog signal is combined into the corresponding receiving channel through the combiner. After combining, the signal size of the reference channel is a2, the size of the nonlinear product is b2, and the background noise output is c2.

[0075] In some possible implementations, the receiving channel corresponding to the reference channel includes a preprocessing component 421, a combining component 422, and an amplifying and converting component 423. The preprocessing component 421 includes a receiving antenna, a multi-stage filter, a first-stage low-noise amplifier and other devices, which are used to preprocess the second analog signal received by the receiving antenna. Among them, the receiving antenna receives the second analog signal of the second center frequency f, the minimum signal level that can be demodulated is d, and the corresponding background noise is d1. After being processed by the multi-stage filter and low-noise amplifier of the preprocessing component 421, a third analog signal is output.

[0076] In the scenario of full-duplex or sub-band full-duplex of the base station, the self-interference signal of the transmitted signal when the transmit channel works normally will enter the receiving channel through the spatial isolation between the transmitting and receiving antennas. The self-interference signal components received by the receiving antenna include the self-interference signal of the transmitted signal, the self-interference signal of the transmitted nonlinear signal, and the self-interference signal of the transmitted background noise. In the third analog signal, the self-interference signal of the transmitted signal can be a3, the self-interference signal of the transmitted nonlinear signal can be b3, and the self-interference signal of the transmitted background noise can be c3.

[0077] In some possible implementations, the combining component 422 includes a combiner connected to the preprocessing component 421 and the frequency shifting component 432 of the reference channel, and is used to combine the third analog signal and the frequency-shifted reference analog signal of the corresponding reference channel, and output a combined fourth analog signal. After combining, the background noise of the fourth analog signal of the receiving channel can be set to c4.

[0078] Figure 4b A schematic diagram of a processing process of a wireless communication device provided in an embodiment of the present disclosure. Figure 4b The present invention is a schematic diagram of the frequency shifting, filtering and combining process of the wireless communication device of the embodiment of the present invention. Among them, the signal after frequency shifting needs to ensure that it does not affect the performance of the receiving link, and at the same time meets the requirements of the algorithm for the link index. The frequency f0 of the frequency shifted signal generated by the signal generator of each channel needs to ensure that the maximum bandwidth of the receiving channel is greater than BW+f0 after the frequency shifting. At the same time, the size of f0-BW ensures that the filter suppression index can be met. Among them, the filter suppression requirements can meet: the noise floor of the self-interference signal between the combiner position f-1 / 2BW and f+1 / 2BW is less than the noise floor of the receiving channel, which becomes c4; at the same time, the noise floor of the receiving channel between f-f0-1 / 2BW and f-f0+1 / 2BW is less than c2. It should be understood that those skilled in the art can set the frequency f0 of each mixing signal of the signal generator according to actual conditions, and the present invention does not limit the specific frequency value of the mixing signal.

[0079] like Figure 4bAs shown, the reference analog signal (center frequency is f) output by the coupling component 431 includes a self-interference in-band signal, a self-interference nonlinear signal and a self-interference background noise signal. After frequency shifting and filtering by the frequency shifting component 432, the frequency-shifted reference analog signal (center frequency is f-f0) is output, including the frequency-shifted self-interference in-band signal, the self-interference nonlinear signal and the self-interference background noise signal; the receiving antenna receives the second analog signal (including the received signal and the received background noise signal) with a center frequency of f, and after filtering by the multi-stage filter and the low-noise amplifier LNA of the pre-processing component 421, the third analog signal (including the received signal and the received background noise signal) is output; then, the third analog signal and the frequency-shifted reference analog signal of the reference channel are combined by the combiner of the combining component 422, and the combined fourth analog signal is output.

[0080] In some possible implementations, such as Figure 4a As shown, the receiving channel also includes an amplifying and converting component 423, which is connected to the combining component 422. The amplifying and converting component 423 includes a second-stage low noise amplifier LNA and an analog-to-digital converter ADC and other devices, which are used to amplify and convert the fourth analog signal after combining to obtain a second digital signal, and output it to the digital frequency shifting component 441 via a digital interface (such as 204 interface).

[0081] Through the frequency shift processing method, the combined receiving signal and the reference signal are in different frequency ranges, which are easy to separate in subsequent processing, thereby realizing multiplexing between the receiving channel and the reference channel and reducing the added channel resources.

[0082] In some possible implementations, such as Figure 4a As shown, the device further includes a digital frequency shift component 441 and a digital cancellation component 442.

[0083] The digital frequency shifting component 441 is connected to the N receiving channels, and is used to perform frequency shift processing on the second digital signals of the N receiving channels respectively, and output digital receiving signals of the N receiving channels and digital reference signals of the N reference channels;

[0084] The digital cancellation component 442 is connected to the digital frequency shift component 441, and is used to perform interference cancellation processing on the digital receiving signals of the N receiving channels according to the digital reference signals of the N reference channels, and output N third digital signals after cancellation.

[0085] For example, if Figure 4aAs shown, the digital frequency shift component 441 is connected to the receiving channels 1-N, and the second digital signals of the receiving channels 1-N are respectively input, and is used to perform frequency shift processing on the second digital signals of the N receiving channels, and the frequency shift processing includes digital extraction filtering and digital frequency shift processing. Through digital extraction filtering and digital frequency shifting, the received signal and the reference signal in the second digital signal are separated and moved to the same frequency (for example, the frequency is 0, zero frequency), and the digital received signal of the receiving channel 1-N and the digital reference signal of the reference channel 1-N are output. The present disclosure does not limit the specific implementation method of digital extraction filtering and digital frequency shifting, as well as the frequencies of the digital received signal and the digital reference signal after the shifting.

[0086] In some possible implementations, the digital cancellation component 442 is connected to the digital frequency shift component 441, and receives the digital reception signal and the digital reference signal from the digital frequency shift component 441. The digital reception signal includes the transmitted self-interference signal, the transmitted nonlinear signal and the transmitted noise floor signal, which need to be offset by the algorithm; the digital reference signal includes the coupled self-interference in-band signal, the self-interference nonlinear signal and the self-interference noise floor signal, which are used for algorithm offset.

[0087] In the example, the digital cancellation component 442 performs interference cancellation processing on the corresponding digital received signal according to the digital reference signal of each reference channel through a preset cancellation algorithm, cancels out the transmitted self-interference signal, the transmitted nonlinear signal and the transmitted noise floor signal in the digital received signal, and outputs a third digital signal. The third digital signal includes the received useful service signal and the received noise floor, and other self-interference signals are processed to be below the received noise floor. The present disclosure does not limit the specific type of the preset cancellation algorithm.

[0088] In some possible implementations, the N third digital signals after interference cancellation processing are sent to the baseband component 45 via the uplink digital link 1-N; the baseband component 45 performs normal sensitivity demodulation processing on the third digital signals, and sends the processed signals to subsequent components of the base station to execute subsequent processing procedures.

[0089] In this way, the digital reference signal of the reference channel can be used to achieve digital cancellation of the self-interference signal in the digital received signal, effectively suppress the in-band interference of the received signal, and improve the accuracy and sensitivity index of the received signal.

[0090] In some possible implementations, there are N transmitting channels, receiving channels, and reference channels, and the N reference channels are connected to a target receiving channel, which is one of the N receiving channels, where N is an integer and N≥1. With this connection method, multiple reference channels only affect one receiving channel, which can reduce the impact on other receiving channels; at the same time, this connection method needs to accommodate multiple reference signals in the receiving signal of the target receiving channel, which has a relatively high requirement on the receiving bandwidth of the target receiving channel.

[0091] Figure 5a A schematic diagram of a wireless communication device provided in an embodiment of the present disclosure. Figure 5a A wireless communication device with N transmit and N receive is shown, in which there are N transmit channels, N receive channels and N reference channels. The N reference channels 1-N are all connected to the target receive channel (for example, receive channel 1). It should be understood that Figure 5a The target receiving channel is merely illustrated as receiving channel 1, which does not constitute a limitation on the embodiments of the present disclosure. N can be any number, and the target receiving channel can also be any one of the receiving channels.

[0092] In some possible implementations, the target receiving channel includes a pre-processing component 521, a combining component 522, and an amplifying and analog-to-digital conversion component 523;

[0093] The preprocessing component 521 is used to receive the second analog signal and output a preprocessed third analog signal;

[0094] The combining component 522 is connected to the pre-processing component 521 and the frequency shifting component 532 of the N reference channels, and is used to combine the third analog signal and the frequency-shifted reference analog signals of the N reference channels, and output a combined fifth analog signal;

[0095] The amplifying and converting component 523 is connected to the combining component, and is used to amplify and perform analog-to-digital conversion on the fifth analog signal, and output the second digital signal of the receiving channel.

[0096] For example, in Figure 5a In the figure, the baseband component 55 sends the baseband signal (i.e., the first digital signal) to the transmitting channels 1-N of the transmitting channel through the downlink digital link 1-N (not shown in the figure), and after being processed by a series of components of the transmitting channel (digital-to-analog converter DAC, amplifier, final power amplifier, filter and other components), N first analog signals are transmitted through the transmitting antenna, and the frequency range of each first analog signal is different.

[0097] In some possible implementations, Figure 5aIn the figure, the reference channel includes reference channels 1-N corresponding to the transmission channels 1-N. For any one of the reference channels 1-N, the reference channel includes a coupling component 531 and a frequency shift component 532. The coupling component 531 may include a coupler and a filter (not shown in the figure), the coupler is used to couple with the transmission channel corresponding to the reference channel, and the filter is used to filter the coupled signal, filter out other background noise and interference signals outside the frequency range of the self-interference signal, and output the reference analog signal of the corresponding transmission channel.

[0098] The signal parameters of the first analog signal and the reference analog signal are similar to those described above and are not described again. The first center frequencies of the first analog signals of the transmitting channels are fn (n is the channel number, 1≤n≤N).

[0099] In some possible implementations, the frequency shifting component 532 is connected to the coupling component 531 and the signal generator 533, and is used to shift the frequency of the reference analog signal and the mixing signal, and output the reference analog signal after the frequency shifting. The frequency shifting component 532 may include a mixer and a filter (not shown in the figure), the mixer is used to mix the reference analog signal with the mixing signal from the signal generator, and the filter is used to filter the mixed signal, filter out other background noise and interference signals outside the frequency range of the self-interference signal, and output the reference analog signal after the frequency shifting.

[0100] In the example, the frequencies of the mixing signals of the signal generators corresponding to different reference channels are different. Assuming that the frequencies of the mixing signals corresponding to reference channels 1-4 are f01, f02, ..., f0N, respectively, the center frequency of the reference analog signal after frequency shifting is fn-f0n (n is the channel number, 1≤n≤N), the frequency range of the third-order nonlinear signal is between fn-3 / 2BW-f0n and fn+3 / 2BW-f0n, and the background noise will also be moved to the frequency range corresponding to fn-f0n. After the mixed signal is filtered, the output frequency-shifted reference analog signal is combined into the target receiving channel through the combiner. After combining, the signal size of the reference channel is a2n, the size of the nonlinear product is b2n, and the background noise output is c2n.

[0101] Among them, Figure 5a As shown, the frequency-shifted reference analog signals of each reference channel can be directly connected to the combining component 522 of the target receiving channel respectively; or they can be combined into one channel and then connected to the combining component 522 of the target receiving channel, which is not limited in the present disclosure.

[0102] In some possible implementations, the target receiving channel includes a preprocessing component 521, a combining component 522, and an amplifying and converting component 523. The preprocessing component 521 includes a receiving antenna, a multi-stage filter, a first-stage low-noise amplifier and other devices, which are used to preprocess the second analog signal received by the receiving antenna. Among them, the receiving antenna receives the second analog signal of the second center frequency fn, the minimum signal level that can be demodulated is d, and the corresponding background noise is d1. After being processed by the multi-stage filter and low-noise amplifier of the preprocessing component 521, the third analog signal of the target receiving channel is output.

[0103] In the scenario of full-duplex or sub-band full-duplex of the base station, the self-interference signal of the transmitted signal when the transmit channel works normally will enter the receiving channel through the spatial isolation between the transmitting and receiving antennas. The self-interference signal components received by the receiving antenna include the self-interference signal of the transmitted signal, the self-interference signal of the transmitted nonlinear signal, and the self-interference signal of the transmitted background noise. In the third analog signal, the self-interference signal of the transmitted signal can be a3, the self-interference signal of the transmitted nonlinear signal can be b3, and the self-interference signal of the transmitted background noise can be c3.

[0104] In some possible implementations, the combining component 522 includes a combiner connected to the preprocessing component 521 and the frequency shifting component 532 of the reference channels 1-N, and is used to combine the third analog signal of the target receiving channel and the frequency-shifted reference analog signals of the N reference channels, and output the combined fifth analog signal. After combining, the background noise of the fifth analog signal of the target receiving channel can be set to c4.

[0105] Figure 5b A schematic diagram of a processing process of a wireless communication device provided in an embodiment of the present disclosure. Figure 5b The present invention is a schematic diagram of the frequency shifting, filtering and combining process of the wireless communication device of the embodiment of the present invention. Among them, the signal after frequency shifting needs to ensure that it does not affect the performance of the receiving link, and at the same time meets the requirements of the algorithm for the link index. The frequency f0n of the frequency shifted signal generated by the signal generator of each channel needs to ensure that after frequency shifting, the maximum bandwidth of the receiving channel is greater than (N-1)BW+f01+...+f0N. At the same time, the size of f0n-BW ensures that the filter suppression index can be met. Among them, the filter suppression requirements can meet: the noise floor of the self-interference signal between the combiner position fn-1 / 2BW and fn+1 / 2BW is less than the noise floor of the receiving channel, which becomes c4; at the same time, the noise floor of the receiving channel between fn-f0n-1 / 2BW and fn-f0n+1 / 2BW is less than c2. It should be understood that those skilled in the art can set the frequency f0n of each frequency shifted signal of the signal generator according to actual conditions, and the present invention does not limit the specific frequency value of the frequency shifted signal.

[0106] like Figure 5bAs shown, the reference analog signal (center frequency is fn) output by the coupling component 531 of the reference channel 1-N includes a self-interference in-band signal, a self-interference nonlinear signal and a self-interference background noise signal. After frequency shifting and filtering by the corresponding frequency shifting component 532, the reference analog signal (center frequency is f1-f01, ..., fN-f0N) after frequency shifting of the reference channel 1-N is output, including the self-interference in-band signal, the self-interference nonlinear signal and the self-interference background noise signal after frequency shifting; the target receiving channel receives the second analog signal (including the receiving signal and the receiving background noise signal) with a center frequency f1, and after filtering by the multi-stage filter and the low noise amplifier LNA of the pre-processing component 521, the third analog signal (including the receiving signal and the receiving background noise signal) with a center frequency f1 is output; then, the third analog signal and the reference analog signals after frequency shifting of the N reference channels are combined by the combiner of the combining component 522, and the fifth combined analog signal is output.

[0107] In some possible implementations, the target receiving channel further includes an amplification and conversion component 523 connected to the combining component 522. The amplification and conversion component 523 includes components such as a second-stage low noise amplifier LNA and an analog-to-digital converter ADC, which are used to amplify and perform analog-to-digital conversion on the fifth analog signal after combining to obtain a second digital signal of the target receiving channel, and output it to the digital frequency shift component via a digital interface (e.g., interface 204).

[0108] In some possible implementations, for N-1 receiving channels (eg, Figure 5a The N-1 receiving channels respectively include a pre-processing component 521 and an amplifying and analog-to-digital conversion component 523 (the structures are the same as those of the pre-processing component 521 and the amplifying and analog-to-digital conversion component 523 of the target receiving channel). The pre-processing component 521 receives the second center frequency fn ( Figure 5a The amplifying and analog-to-digital conversion component 523 amplifies and converts the third analog signal to obtain a second digital signal corresponding to the receiving channel, and outputs it to the digital frequency shifting component via a digital interface (for example, interface 204).

[0109] Through the frequency shift processing method, the combined receiving signal and the reference signal are in different frequency ranges, which are easy to separate in subsequent processing, thereby realizing multiplexing between the receiving channel and the reference channel; adopting the above connection method, the added channel resources are further reduced, and multiple reference channels only affect one receiving channel, which can reduce the impact on other receiving channels.

[0110] In some possible implementations, the device further includes a digital frequency shift component 541 and a digital cancellation component 542.

[0111] The digital frequency shifting component 541 is connected to the N receiving channels, and is used to perform frequency shift processing on the second digital signal of the target receiving channel, and output the digital receiving signal of the target receiving channel and the digital reference signals of the N reference channels;

[0112] The digital frequency shifting component 541 is further used to perform frequency shift processing on the second digital signals of the N-1 receiving channels that are not connected to the N reference channels, and output the digital receiving signals of the N-1 receiving channels;

[0113] The digital cancellation component 542 is connected to the digital frequency shift component 541, and is used to perform interference cancellation processing on the digital receiving signals of the N receiving channels according to the digital reference signals of the N reference channels, and output N third digital signals after cancellation.

[0114] For example, if Figure 5a As shown, the digital frequency shifting component 541 is connected to the receiving channels 1-N, and the second digital signals of the receiving channels 1-N are respectively inputted, and is used to perform frequency shift processing on the second digital signal of the target receiving channel and the second digital signals of the N-1 receiving channels not connected to the N reference channels, respectively, and the frequency shift processing includes digital extraction filtering and digital frequency shift processing. For the target receiving channel ( Figure 5a The invention relates to a second digital signal of a receiving channel 1 in a target receiving channel, and separates and shifts the receiving signal and N reference signals in the second digital signal to the same frequency (for example, the frequency is 0, zero frequency) through digital extraction filtering and digital frequency shifting, and outputs the digital receiving signal of the target receiving channel and the digital reference signals of the reference channels 1-N. The present disclosure does not limit the specific implementation of the digital extraction filtering and digital frequency shifting, and the frequencies of the digital receiving signal and the digital reference signal after the shifting.

[0115] In some possible implementations, for the N-1 receiving channels (receiving channels 2-N) that are not connected to the N reference channels, the second digital signals of the N-1 receiving channels are respectively shifted to the same frequency as the digital reference signals of reference channels 1-N through digital frequency shifting, and the digital receiving signals of the N-1 receiving channels are output.

[0116] In some possible implementations, the digital cancellation component 542 is connected to the digital frequency shift component 541, and receives each digital reception signal and each digital reference signal from the digital frequency shift component 541. The digital reception signal includes a transmitted self-interference signal, a transmitted nonlinear signal, and a transmitted noise floor signal, which need to be offset by an algorithm; the digital reference signal includes a coupled self-interference in-band signal, a self-interference nonlinear signal, and a self-interference noise floor signal, which are used for algorithm offset.

[0117] In the example, the digital cancellation component 542 performs interference cancellation processing on the corresponding digital received signal according to the digital reference signal of each reference channel through a preset cancellation algorithm, cancels the transmitted self-interference signal, the transmitted nonlinear signal and the transmitted noise floor signal in the digital received signal, and outputs a third digital signal. The third digital signal includes the received useful service signal and the received noise floor, and other self-interference signals are processed to be below the received noise floor. The present disclosure does not limit the specific type of the preset cancellation algorithm.

[0118] In some possible implementations, the N third digital signals after interference cancellation processing are sent to the baseband component 55 via the uplink digital link 1-N; the baseband component 55 performs normal sensitivity demodulation processing on the third digital signals, and sends the processed signals to subsequent components of the base station to execute subsequent processing procedures.

[0119] In this way, the digital reference signal of the reference channel can be used to achieve digital cancellation of the self-interference signal in the digital received signal, effectively suppress the in-band interference of the received signal, and improve the accuracy and sensitivity index of the received signal. In addition, the above connection method further simplifies the structure of the digital frequency shift component and the digital cancellation component, and further reduces the cost.

[0120] In some possible implementations, the number of the transmitting channels and the reference channels are both N, the number of the receiving channels is N+1, and the N reference channels are connected to the N+1th receiving channel, where N is an integer and N≥1. With this connection, each reference channel has no effect on the signal of each receiving channel, which reduces the requirements on the filter of each receiving channel; at the same time, this connection requires an additional receiving channel.

[0121] Figure 6a A schematic diagram of a wireless communication device provided in an embodiment of the present disclosure. Figure 6a A wireless communication device with N transmission and N reception is shown, in which there are N transmission channels, N+1 reception channels and N reference channels. Reference channels 1-N are respectively connected to reception channel N+1. N can be any number.

[0122] In some possible implementations, the N+1th receiving channel includes a combining component, an amplifying and converting component;

[0123] Wherein: the combining component is connected to the frequency shifting components of the N reference channels, and is used to combine the frequency-shifted reference analog signals of the N reference channels and output a combined sixth analog signal;

[0124] The amplifying and converting component is connected to the combining component, and is used to amplify and perform analog-to-digital conversion on the sixth analog signal, and output the second digital signal of the N+1th receiving channel.

[0125] For example, in Figure 6a In the figure, the baseband component 65 sends the baseband signal (i.e., the first digital signal) to the transmitting channels 1-N of the transmitting channel through the downlink digital link 1-N (not shown in the figure), and after being processed by a series of components of the transmitting channel (digital-to-analog converter DAC, amplifier, final power amplifier, filter and other components), N first analog signals are transmitted through the transmitting antenna. The frequency range of the first analog signal of each transmitting channel is different, and the first center frequency of each first analog signal is fn (n is the channel number, 1≤n≤N).

[0126] In some possible implementations, Figure 6a In the figure, the reference channel includes reference channels 1-N corresponding to the transmission channels 1-N. For any one of the reference channels 1-N, the reference channel includes a coupling component 631 and a frequency shift component 632. Among them, the coupling component 631 may include a coupler and a filter (not shown in the figure), the coupler is used to couple with the transmission channel corresponding to the reference channel, and the filter is used to filter the coupled signal, filter out other background noise and interference signals outside the frequency range of the self-interference signal, and output the reference analog signal of the corresponding transmission channel. The signal parameters of the first analog signal and the reference analog signal are similar to those described above and will not be repeated here.

[0127] In some possible implementations, the frequency shifting component 632 is connected to the coupling component 631 and the signal generator 633, and is used to frequency shift the reference analog signal and the mixing signal, and output the reference analog signal after the frequency shifting. The frequency shifting component 632 may include a mixer and a filter (not shown in the figure), the mixer is used to frequency shift the reference analog signal and the mixing signal from the signal generator, and the filter is used to filter the frequency shifted signal, filter out other background noise and interference signals outside the frequency range of the self-interference signal, and output the reference analog signal after the frequency shifting.

[0128] In the example, the frequencies of the mixing signals of the signal generators corresponding to different reference channels are different. Assuming that the frequencies of the mixing signals corresponding to reference channels 1-N are f01, ..., f0N, respectively, the center frequency of the reference analog signal after frequency shifting is fn-f0n (n is the channel number, 1≤n≤N), the frequency range of the third-order nonlinear signal is between fn-3 / 2BW-f0n and fn+3 / 2BW-f0n, and the background noise will also be moved to the frequency range corresponding to fn-f0n. After the mixed signal is filtered, the output frequency-shifted reference analog signal is combined into the N+1th receiving channel through the combiner. After combining, the signal size of each reference channel is a2n, the size of the nonlinear product is b2n, and the background noise output is c2n.

[0129] In some possible implementations, the N+1th receiving channel ( Figure 6a The receiving channel N+1) includes a combining component 622 and an amplifying and converting component 623. The combining component 622 includes a combiner connected to the frequency shifting component 632 of the reference channels 1-N, and is used to combine the frequency-shifted reference analog signals of the N reference channels and output a combined sixth analog signal.

[0130] Figure 6b A schematic diagram of a processing process of a wireless communication device provided in an embodiment of the present disclosure. Figure 6b The present invention is a schematic diagram of the frequency shifting, filtering and combining process of the wireless communication device of the embodiment of the present invention. Among them, the signal after frequency shifting needs to ensure that it does not affect the performance of the receiving link, and at the same time meets the link index requirements of the algorithm. The frequency f0n of the mixing signal generated by the signal generator of each channel needs to ensure that after frequency shifting, the maximum bandwidth of the receiving channel is greater than BW+f0n. At the same time, the size of f0n-BW ensures that the filter suppression index can be met. It should be understood that those skilled in the art can set the frequency f0n of each mixing signal of the signal generator according to actual conditions, and the present invention does not limit the specific frequency value of the mixing signal.

[0131] like Figure 6b As shown, the reference analog signal (center frequency is f1-fN) output by the coupling component 631 of the reference channel 1-N includes the self-interference in-band signal, the self-interference nonlinear signal and the self-interference background noise signal. After mixing and filtering by the corresponding frequency shifting component 632, the frequency-shifted reference analog signal of the reference channel 1-N (center frequency is f1-f01, ..., fN-f0N), including the self-interference in-band signal, the self-interference nonlinear signal and the self-interference background noise signal after mixing, is output; the N+1th receiving channel directly combines the frequency-shifted reference analog signals of the N reference channels through the combiner of the combining component 622, and outputs the combined sixth analog signal.

[0132] In some possible implementations, the N+1th receiving channel further includes an amplification and conversion component 623 connected to the combining component 622. The amplification and conversion component 623 includes components such as a second-stage low noise amplifier LNA and an analog-to-digital converter ADC, which are used to amplify and perform analog-to-digital conversion on the sixth analog signal after combining to obtain a second digital signal of the N+1th receiving channel, and output it to the digital frequency shift component via a digital interface (e.g., interface 204).

[0133] In some possible implementations, for normal N receiving channels (eg Figure 6a The N receiving channels 1-N in the figure are respectively composed of a preprocessing component 621 and an amplifying and analog-to-digital conversion component 623. The preprocessing component 621 includes a receiving antenna, a multi-stage filter, a first-stage low-noise amplifier, etc., and is used to preprocess the second analog signal received by the receiving antenna. The preprocessing component 621 receives the second center frequency fn ( Figure 6a The amplifying and analog-to-digital conversion component 623 amplifies and converts the third analog signal to analog-to-digital to obtain a second digital signal corresponding to the receiving channel, and outputs it to the digital frequency shifting component via a digital interface (e.g., interface 204).

[0134] Through the frequency shift processing method, the combined receiving signal and the reference signal are in different frequency ranges, which are easy to separate in subsequent processing, thereby realizing multiplexing between the receiving channel and the reference channel; adopting the above connection method can further reduce the impact on other receiving channels.

[0135] In some possible implementations, the device further includes a digital frequency shift component 641 and a digital cancellation component 642.

[0136] The digital frequency shift component 641 is connected to N+1 receiving channels, and is used to perform frequency shift processing on the second digital signal of the N+1th receiving channel, and output the digital reference signals of the N reference channels;

[0137] The digital frequency shifting component 641 is also used to perform frequency shift processing on the second digital signals of the N receiving channels, and output the digital receiving signals of the N receiving channels;

[0138] The digital cancellation component 642 is connected to the digital frequency shift component 641, and is used to perform interference cancellation processing on the digital receiving signals of the N receiving channels according to the digital reference signals of the N reference channels, and output N third digital signals after cancellation.

[0139] For example, if Figure 6aAs shown, the digital frequency shifting component 641 is respectively connected to the N+1 receiving channels (receiving channels 1-N+1), and the second digital signals of the receiving channels 1-N+1 are respectively input, and is used to perform frequency shift processing on the second digital signal of the N+1th receiving channel and the second digital signal of the N receiving channels, respectively, and the frequency shift processing includes digital extraction filtering and digital frequency shift processing. For the second digital signal of the N+1th receiving channel (receiving channel N+1), the N reference signals in the second digital signal are separated and moved to the same frequency (for example, the frequency is 0, zero frequency) through digital extraction filtering and digital frequency shifting, and the digital reference signals of the reference channels 1-N are output.

[0140] In some possible implementations, for normal N receiving channels (receiving channels 1-N), the second digital signals of the N receiving channels are respectively shifted to the same frequency as the digital reference signals of reference channels 1-N through digital frequency shifting, and the digital receiving signals of the N receiving channels are output.

[0141] The present disclosure does not limit the specific implementation of digital extraction filtering and digital frequency shifting, and the frequency of the shifted digital reference signal.

[0142] In some possible implementations, the digital cancellation component 642 is connected to the digital frequency shift component 641, and receives each digital receiving signal and each digital reference signal from the digital frequency shift component. The digital receiving signal includes a transmitted self-interference signal, a transmitted nonlinear signal, and a transmitted noise floor signal, which need to be offset by an algorithm; the digital reference signal includes a coupled self-interference in-band signal, a self-interference nonlinear signal, and a self-interference noise floor signal, which are used for algorithm offset.

[0143] In the example, the digital cancellation component 642 performs interference cancellation processing on the corresponding digital received signal according to the digital reference signal of each reference channel through a preset cancellation algorithm, cancels out the transmitted self-interference signal, the transmitted nonlinear signal and the transmitted noise floor signal in the digital received signal, and outputs a third digital signal. The third digital signal includes the received useful service signal and the received noise floor, and other self-interference signals are processed to be below the received noise floor. The present disclosure does not limit the specific type of the preset cancellation algorithm.

[0144] In some possible implementations, the N third digital signals after interference cancellation processing are sent to the baseband component 65 via the uplink digital link 1-N (not shown in the figure); the baseband component 65 performs normal sensitivity demodulation processing on the third digital signals, and sends the processed signals to subsequent components of the base station to execute subsequent processing procedures.

[0145] In this way, the digital reference signal of the reference channel can be used to achieve digital cancellation of the self-interference signal in the digital received signal, effectively suppressing the in-band interference of the received signal. In addition, the above-mentioned connection method reduces the influence of the reference channel on the receiving channel, further improving the accuracy and sensitivity indicators of the received signal.

[0146] According to the embodiments of the present disclosure, based on the idea of ​​frequency division, the receiving channel can be reused as a reference channel. Compared with the cancellation scheme in the related art, the required additional reference channels are reduced, and the layout area and cost are reduced; and through the digital domain self-interference cancellation technology, a self-interference channel model is established for the self-interference channel according to the transmitted signal and the received signal, and a cancellation signal is generated based on this model and the real-time background noise of the transmitting channel, thereby improving the accuracy of the self-interference cancellation signal, enhancing the self-interference suppression capability, and ensuring that the self-interference signal does not affect the sensitivity of the receiving channel.

[0147] According to the second aspect of the embodiment of the present disclosure, a wireless communication system is also provided, the system includes the above-mentioned wireless communication device. The system may also include any other components / assemblies required by the communication system of the base station in the base station full-duplex and sub-band full-duplex scenarios, and those skilled in the art may set them according to actual conditions, and the present disclosure does not limit this.

[0148] Those skilled in the art will appreciate that all or some of the steps, systems, and functional modules / units in the apparatus disclosed above may be implemented as software, firmware, hardware, or a suitable combination thereof.

[0149] In hardware implementations, the division between functional modules / units mentioned in the above description does not necessarily correspond to the division of physical components; for example, one physical component may have multiple functions, or one function or step may be performed by several physical components in cooperation.

[0150] Some physical components or all physical components may be implemented as software executed by a processor, such as a central processing unit (CPU), a digital signal processor or a microprocessor, or implemented as hardware, or implemented as an integrated circuit, such as an application-specific integrated circuit. Such software may be distributed on a computer-readable medium, which may include a computer storage medium (or non-temporary medium) and a communication medium (or temporary medium). As known to those of ordinary skill in the art, the term computer storage medium includes volatile and non-volatile, removable and non-removable media implemented in any method or technology for storing information (such as computer-readable instructions, data structures, program modules or other data). Computer storage media include, but are not limited to, random access memory (RAM, more specifically SDRAM, DDR, etc.), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory (FLASH) or other disk storage; read-only compact disk (CD-ROM), digital versatile disk (DVD) or other optical disk storage; magnetic cassettes, magnetic tapes, disk storage or other magnetic storage; any other medium that can be used to store desired information and can be accessed by a computer. Furthermore, it is well known to those skilled in the art that communication media typically embodies computer readable instructions, data structures, program modules, or other data in a modulated data signal such as a carrier wave or other transport mechanism, and may include any information delivery media.

[0151] The present disclosure has disclosed example embodiments, and although specific terms are employed, they are used and should be interpreted only in a general illustrative sense and not for limiting purposes. In some instances, it will be apparent to those skilled in the art that, unless otherwise expressly stated, features, characteristics, and / or elements described in conjunction with a particular embodiment may be used alone or in combination with features, characteristics, and / or elements described in conjunction with other embodiments. Therefore, those skilled in the art will appreciate that various changes in form and detail may be made without departing from the scope of the present disclosure as set forth in the appended claims.

Claims

1. A wireless communication device, characterized in that: Including transmitting channel, receiving channel and reference channel, The reference channel includes a coupling component and a frequency shifting component, wherein the coupling component is used to couple the first analog signal transmitted by the corresponding transmitting channel to obtain a reference analog signal; the frequency shifting component is used to frequency shift the reference analog signal to obtain a frequency-shifted reference analog signal; the frequency-shifted reference analog signal is combined into at least one receiving channel; The frequency-shifted reference analog signal is used to offset interference in the second analog signal received by the receiving channel.

2. The device according to claim 1, characterized in that The device further comprises a signal generator, which is connected to the frequency shifting component of the reference channel and is used to generate a mixing signal corresponding to the reference channel. Wherein, the frequency shifting component shifts the frequency of the reference analog signal based on the mixing signal to obtain a frequency-shifted reference analog signal.

3. The device according to claim 1, characterized in that The number of the transmitting channels, the receiving channels and the reference channels are all N, and the N reference channels are respectively connected to the corresponding N receiving channels, where N is an integer and N≥1; Wherein, at least one receiving channel includes a pre-processing component, a combining component, an amplifying and converting component; The preprocessing component is used to receive the second analog signal and output a preprocessed third analog signal; The combining component is connected to the pre-processing component and the frequency shifting component of the reference channel, and is used to combine the third analog signal and the frequency-shifted reference analog signal of the corresponding reference channel, and output a combined fourth analog signal; The amplifying and converting component is connected to the combining component, and is used to amplify and perform analog-to-digital conversion on the fourth analog signal, and output the second digital signal of the receiving channel.

4. The device according to claim 3, characterized in that The device also includes a digital frequency shift component and a digital cancellation component. The digital frequency shifting component is connected to the N receiving channels, and is used to perform frequency shift processing on the second digital signals of the N receiving channels respectively, and output digital receiving signals of the N receiving channels and digital reference signals of the N reference channels; The digital cancellation component is connected to the digital frequency shift component, and is used to perform interference cancellation processing on the digital receiving signals of the N receiving channels according to the digital reference signals of the N reference channels, and output N third digital signals after cancellation.

5. The device according to claim 1, characterized in that The number of the transmitting channels, the receiving channels and the reference channels are all N, the N reference channels are connected to the target receiving channel, the target receiving channel is one of the N receiving channels, N is an integer and N≥1; Wherein, the target receiving channel includes a pre-processing component, a combining component, an amplifying and analog-to-digital conversion component; The preprocessing component is used to receive the second analog signal and output a preprocessed third analog signal; The combining component is connected to the preprocessing component and the frequency shifting components of the N reference channels, and is used to combine the third analog signal and the frequency-shifted reference analog signals of the N reference channels, and output a combined fifth analog signal; The amplifying and converting component is connected to the combining component, and is used to amplify and perform analog-to-digital conversion on the fifth analog signal, and output the second digital signal of the receiving channel.

6. The device according to claim 5, characterized in that The device also includes a digital frequency shift component and a digital cancellation component. The digital frequency shifting component is connected to the N receiving channels, and is used to perform frequency shift processing on the second digital signal of the target receiving channel, and output the digital receiving signal of the target receiving channel and the digital reference signal of the N reference channels; The digital frequency shifting component is further used to perform frequency shift processing on the second digital signals of N-1 receiving channels that are not connected to the N reference channels, and output the digital receiving signals of the N-1 receiving channels; The digital cancellation component is connected to the digital frequency shift component, and is used to perform interference cancellation processing on the digital receiving signals of the N receiving channels according to the digital reference signals of the N reference channels, and output N third digital signals after cancellation.

7. The device according to claim 1, characterized in that The number of the transmitting channels and the number of the reference channels are both N, the number of the receiving channels is N+1, the N reference channels are connected to the N+1th receiving channel, N is an integer and N≥1; The N+1th receiving channel includes a combining component, an amplifying and converting component; wherein: The combining component is connected to the frequency shifting components of the N reference channels, and is used to combine the frequency-shifted reference analog signals of the N reference channels and output a combined sixth analog signal; The amplifying and converting component is connected to the combining component, and is used to amplify and perform analog-to-digital conversion on the sixth analog signal, and output the second digital signal of the N+1th receiving channel.

8. The device according to claim 7, characterized in that The device also includes a digital frequency shift component and a digital cancellation component. The digital frequency shift component is connected to N+1 receiving channels, and is used to perform frequency shift processing on the second digital signal of the N+1th receiving channel, and output the digital reference signal of the N reference channels; The digital frequency shifting component is also used to perform frequency shift processing on the second digital signals of the N receiving channels, and output the digital receiving signals of the N receiving channels; The digital cancellation component is connected to the digital frequency shift component, and is used to perform interference cancellation processing on the digital receiving signals of the N receiving channels according to the digital reference signals of the N reference channels, and output N third digital signals after cancellation.

9. The device according to claim 3, 5 or 7, characterized in that The frequency ranges of the first analog signals transmitted by the N transmitting channels are different; the frequency ranges of the second analog signals received by the N receiving channels are different; the first analog signal of the nth transmitting channel and the second analog signal of the nth receiving channel are in the same frequency range, the frequency ranges overlap or the frequency ranges are adjacent, 1≤n≤N, The reference analog signal of the nth reference channel includes a self-interference in-band signal, a self-interference nonlinear signal and a self-interference background noise signal of the first analog signal coupled to the nth transmission channel.

10. A wireless communication system, characterized in that: The system comprises the wireless communication device according to any one of claims 1 to 9.

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