Communication method and communication device of frequency division duplex system

Abstract

The embodiment of the invention provides a communication method and a communication device of a frequency division duplex system, which can send and receive a sensing signal in a downlink frequency band so as to realize a radar sensing function. The communication method comprises the steps that after a first sensing signal is sent through a downlink frequency band, a second sensing signal is received through the downlink frequency band, the second sensing signal is converted into a first digital signal, and radar sensing is carried out according to the first digital signal.

Description

Technical Field

[0001] This application relates to the field of wireless communication, and more particularly to a communication method and communication device for a frequency division duplex system. Background Technology

[0002] Frequency division duplex (FDD) is a technology that uses two independent channels to receive and transmit information.

[0003] In an FDD system, the base station transmits downlink signals via the downlink frequency band and receives uplink signals via the uplink frequency band.

[0004] However, after the base station of the FDD system sends downlink signals, it cannot receive the environmental echo signals corresponding to the downlink signals. Therefore, the base station of the FDD system does not have radar sensing capabilities. Summary of the Invention

[0005] This application provides a communication method for a frequency division duplex system, capable of transmitting and receiving sensing signals in the downlink frequency band, thereby realizing radar sensing functionality. This application also provides a communication apparatus, a computer-readable storage medium, and a computer program product capable of implementing the above method.

[0006] A first aspect provides a communication device comprising a transmitting module, a feedback module, and a digital processing module. The transmitting module is used to transmit a first sensing signal via a downlink frequency band; the feedback module is used to receive a second sensing signal via the downlink frequency band and convert the second sensing signal into a first digital signal; and the digital processing module is used to perform radar sensing based on the first digital signal.

[0007] In this system, both the first and second sensing signals are used for radar sensing. The second sensing signal is obtained by reflecting the first sensing signal from the environment, and its downlink frequency band is the FDD band. By implementing this system, the feedback module can transmit and receive sensing signals in a time-division multiplexing manner within the downlink frequency band, and the target can be detected by radar based on the digital signal corresponding to the sensing signal, thus solving the problem that existing FDD base stations cannot perform radar sensing.

[0008] In conjunction with the first aspect, in the first possible implementation, both the first sensing signal and the second sensing signal are pulse wave signals.

[0009] In conjunction with the first aspect, in the second possible implementation, the transmitting module includes a first signal conversion unit and a circulator, and the feedback module includes a second signal conversion unit, a first switch, a low-noise amplifier, and a second switch. When the second switch connects the circulator and the low-noise amplifier, and the first switch connects the second signal conversion unit and the low-noise amplifier, the circulator is used to receive a second sensing signal via the downlink frequency band; the low-noise amplifier is used to amplify the second sensing signal from the circulator; and the second signal conversion unit is used to convert the amplified second sensing signal from the low-noise amplifier into a first digital signal. The first signal conversion unit may include, but is not limited to, a digital-to-analog converter, a mixer, and a power amplifier, and the second signal conversion unit may include an analog-to-digital converter and a mixer. Both the first and second switches are switches corresponding to the entire antenna surface. This allows sensing signals in the downlink frequency band to be acquired based on the circulator and the feedback module, thus providing a radar sensing implementation method.

[0010] In a third possible implementation, combining the second possible implementation of the first aspect, when the first switch connects the second signal conversion unit and the first signal conversion unit, and the second switch grounds the circulator, the first signal conversion unit is used to convert the digital signal to be processed into a first analog signal; the second signal conversion unit is used to convert the first analog signal into a second digital signal; after the digital processing module performs data predistortion processing on the second digital signal, the first signal conversion unit is also used to convert the data predistortion processed second digital signal into a first sensing signal. This provides a method for performing data predistortion processing on the transmitted sensing signal.

[0011] In conjunction with the second possible implementation of the first aspect, in the fourth possible implementation, when the first switch connects the second signal conversion unit and the first signal conversion unit, and the second switch grounds the circulator, the first signal conversion unit is further used to convert the downlink signal to be processed into a second analog signal; the second signal conversion unit is further used to convert the second analog signal into a third digital signal; the data processing module is further used to perform digital predistortion processing on the second downlink data; the first signal conversion unit is further used to convert the third digital signal after data predistortion processing into a target downlink signal, and send the target downlink signal to the circulator; the circulator is used to output the target downlink signal. This provides a method for performing data predistortion processing on downlink signals, and also allows for time-division multiplexing of downlink data and sensing signals.

[0012] In conjunction with the second possible implementation of the first aspect, in the fourth possible implementation, the communication device of this application further includes a receiving module, which is used to receive a first uplink signal via an uplink frequency band during a target time period; the feedback module is also used to receive a second uplink signal via a downlink frequency band during the target time period.

[0013] In conjunction with the fourth possible implementation of the first aspect, in the fifth possible implementation, the second switch is further used to connect the circulator and the low-noise amplifier during the target time period; the circulator is used to receive the second uplink signal via the downlink frequency band during the target time period; the low-noise amplifier is further used to amplify the second uplink signal from the circulator; the first switch is further used to connect the second signal conversion unit and the low-noise amplifier during the target time period; the second signal conversion unit is further used to convert the amplified second uplink signal from the low-noise amplifier into a fourth digital signal. During the target time period, uplink signals can be received simultaneously via the uplink and downlink frequency bands of the FDD, thus achieving supplementary uplink functionality, expanding the uplink communication range, and improving uplink speed.

[0014] In another possible implementation, combining any one of the second to third possible implementations of the first aspect, both the first switch and the second switch are toggle switches. That is, when the first switch connects the second signal conversion unit and the low-noise amplifier, the connection between the first signal conversion unit and the second signal conversion unit is disconnected; when the first switch connects the first signal conversion unit and the second signal conversion unit, the connection between the second signal conversion unit and the low-noise amplifier is disconnected. When the second switch connects the circulator and the low-noise amplifier, the connection between the circulator and ground is disconnected; when the second switch connects the circulator and ground, the connection between the circulator and the low-noise amplifier is disconnected.

[0015] In conjunction with the above possible implementations of the first aspect, in another possible implementation, the digital processing module is specifically used to perform one or more of the following based on the first digital signal: spectral estimation, constant false alarm rate (CFAR) detection, channel estimation, distance estimation, velocity estimation, or angle estimation.

[0016] In conjunction with the possible implementations described above in the first aspect, another possible implementation includes a switching period between the first and second time periods. This can reduce the mutual interference between the transmitted and received sensing signals.

[0017] A second aspect provides a communication device comprising a transmitting module, a feedback module, and a digital processing module. The transmitting module is used to transmit a first sensing signal via a first downlink frequency band during a first time period; the feedback module is used to receive a second sensing signal via a second downlink frequency band during the first time period and convert the second sensing signal into a first digital signal; the digital processing module is used to perform radar sensing based on the first digital signal. Both the first and second sensing signals are used for radar sensing, the second sensing signal is obtained by reflecting the first sensing signal from the environment, and both the first and second downlink frequency bands are FDD frequency bands.

[0018] Implemented in this way, it is possible to send and receive sensing signals in different downlink frequency bands, and to perform radar sensing based on the digital signals corresponding to the sensing signals.

[0019] In conjunction with the second aspect, in the first possible implementation, both the first sensing signal and the second sensing signal are continuous wave signals.

[0020] In conjunction with the second aspect or the first possible implementation of the second aspect, in the second possible implementation, the transmitting module includes a first signal conversion unit and a circulator, and the feedback module includes a second signal conversion unit, a first switch, a second switch, and a low-noise amplifier. Both the first and second switches are switches corresponding to the receiving antenna. The first switch is used to connect the circulator and the low-noise amplifier during a first time period; the low-noise amplifier is used to amplify the second sensing signal from the circulator; the second switch is used to connect the second signal conversion unit and the low-noise amplifier during the first time period; the second signal conversion unit is used to convert the signal amplified by the low-noise amplifier into a first digital signal. This allows for data pre-distortion processing of the sensing signal, reducing signal distortion.

[0021] In a third possible implementation, combining the second aspect or the first possible implementation of the second aspect, the feedback module further includes a third switch and a fourth switch, both of which are switches corresponding to the transmitting antenna. The third switch is used to connect the second signal conversion unit and the first signal conversion unit during the first time period, and the fourth switch is used to ground the circulator during the first time period. The first signal conversion unit is used to convert the digital signal to be processed into a first analog signal. The second signal conversion unit is also used to convert the first analog signal into a second digital signal. After the digital processing module performs data pre-distortion processing on the second digital signal, the first signal conversion unit is also used to convert the data pre-distorted second digital signal into a first sensing signal. This allows for data pre-distortion processing of the sensing signal, reducing the distortion of the sensing signal.

[0022] In a fourth possible implementation, combining the second aspect or the first possible implementation of the second aspect, both the first and third switches are used to connect the second signal conversion unit and the first signal conversion unit during the second time period; both the second and fourth switches are used to ground the circulator during the second time period; the first signal conversion unit is used to convert the downlink signal to be processed into a second analog signal; the second signal conversion unit is also used to convert the second analog signal into a third digital signal; after the digital processing module performs data pre-distortion processing on the third digital signal, the first signal conversion unit is also used to convert the data pre-distorted third digital signal into a target downlink signal and send the target downlink signal to the circulator; the circulator is used to output the target downlink signal. This allows for data pre-distortion processing of the downlink signal to reduce downlink signal distortion. Furthermore, downlink signals can be transmitted in parallel via the first and second downlink frequency bands, and the second time period for transmitting the downlink signal is different from the first time period for transmitting the sensing signal.

[0023] The third aspect provides a communication method for an FDD system. This method includes: transmitting a first sensing signal via an FDD downlink frequency band, receiving a second sensing signal via the same FDD downlink frequency band, converting the second sensing signal into a first digital signal, and performing radar sensing based on the first digital signal. The second sensing signal is obtained by reflecting the first sensing signal back to the environment. The FDD downlink frequency band is the frequency band used for transmitting downlink data in an FDD system. This provides a method for receiving sensing signals via a downlink frequency band, enabling radar sensing based on the corresponding digital signal.

[0024] In conjunction with the third aspect, in the first possible implementation, both the first sensing signal and the second sensing signal are pulse wave signals.

[0025] In conjunction with the third aspect or the first possible implementation of the third aspect, in the second possible implementation, a switching period is included between the period for transmitting the first sensing signal and the period for receiving the second sensing signal. The switching period includes one or more time-domain resources. This reduces mutual interference between the transmitted and received sensing signals, and also reduces multipath interference.

[0026] In conjunction with the third aspect or more possible implementations, in the third possible implementation, converting the second sensing signal into a first digital signal includes: amplifying the second sensing signal and converting the amplified second sensing signal into a first digital signal. This amplification of the sensing signal improves the accuracy of the detection signal.

[0027] In conjunction with the third aspect or more possible implementations, in a fourth possible implementation, the communication method of this application further includes: converting the digital signal to be processed into a first analog signal, then converting the first analog signal into a second digital signal; performing data predistortion processing on the second digital signal; and converting the data predistortion processed second digital signal into a first sensing signal. This allows for data predistortion processing of the sensing signal, thereby reducing the distortion of the sensing signal.

[0028] In conjunction with the third aspect or more possible implementations, in the fifth possible implementation, the communication method of this application further includes: converting the downlink signal to be processed into a second analog signal; converting the second analog signal into a third digital signal; performing data predistortion processing on the third digital signal; and converting the data predistortion processed third digital signal into a target downlink signal. This allows for data predistortion processing of the downlink signal, thereby reducing downlink signal distortion.

[0029] In conjunction with the third or more possible implementations, in the sixth possible implementation, the communication method of this application further includes: receiving a first uplink signal via an uplink frequency band during the target time period; and receiving a second uplink signal via a downlink frequency band during the target time period. This allows for simultaneous reception of uplink signals using both uplink and downlink frequency bands, thereby achieving a supplementary uplink function, effectively expanding the uplink range and improving uplink speed.

[0030] In combination with the third aspect or more of the possible implementations, in the seventh possible implementation, radar sensing based on the first digital signal includes: channel estimation, spectrum estimation, CFAR detection, velocity estimation, angle estimation, or range estimation based on the first digital signal.

[0031] The fourth aspect provides a communication method for an FDD system, comprising: transmitting a first sensing signal via a first FDD downlink frequency band during a first time period; receiving a second sensing signal via a second FDD downlink frequency band during the same first time period; converting the second sensing signal into a first digital signal; and performing radar sensing based on the first digital signal. The second sensing signal is obtained by reflecting the first sensing signal from the environment. The FDD downlink frequency band is the frequency band used in FDD for transmitting downlink data.

[0032] In conjunction with the fourth aspect, in the first possible implementation, both the first sensing signal and the second sensing signal are continuous wave signals.

[0033] In conjunction with the fourth aspect or the first possible implementation, in the second possible implementation, the first FDD downlink frequency band and the second FDD downlink frequency band include one or more frequency domain resources, which are carriers or subcarriers.

[0034] In combination with the fourth aspect or more possible implementations, in the third possible implementation, converting the second sensing signal into a first digital signal includes: amplifying the second sensing signal and converting the amplified second sensing signal into a first digital signal.

[0035] In conjunction with the fourth aspect or the above possible implementations, in the fourth possible implementation, the communication method of this application further includes: converting the digital signal to be processed into a first analog signal; converting the first analog signal into a second digital signal; performing data predistortion processing on the second digital signal; and converting the data predistortion processed second digital signal into a first sensing signal.

[0036] In conjunction with the fourth aspect or the above possible implementations, in the fifth possible implementation, the communication method of this application further includes: converting the downlink signal to be processed into a second analog signal; converting the second analog signal into a third digital signal; performing data predistortion processing on the third digital signal; converting the data predistortion processed third digital signal into a target downlink signal; and transmitting the target downlink signal.

[0037] In combination with the fourth aspect or more of the possible implementations, in the sixth possible implementation, radar sensing based on the first digital signal includes: channel estimation, spectrum estimation, CFAR detection, angle estimation, velocity estimation or range estimation based on the first digital signal.

[0038] For the explanations of terms, specific steps, and beneficial effects in the fourth aspect, please refer to the corresponding descriptions in the second aspect.

[0039] The fifth aspect provides a computer-readable storage medium including computer-readable instructions; the computer-readable instructions are used to implement the methods of the foregoing aspects or any possible implementations of the foregoing aspects.

[0040] The sixth aspect provides a computer program product comprising computer-readable instructions; the computer-readable instructions are used to implement the methods of the foregoing aspects or any possible implementations of the foregoing aspects. Attached Figure Description

[0041] Figure 1 This is a structural diagram of a communication device in an embodiment of this application;

[0042] Figure 2 This is another structural diagram of the communication device in the embodiments of this application;

[0043] Figure 3 This is another structural diagram of the communication device in the embodiments of this application;

[0044] Figure 4 This is another structural diagram of the communication device in the embodiments of this application;

[0045] Figure 5 This is a schematic diagram of the time-frequency resources of various signals in the embodiments of this application;

[0046] Figure 6 This is a schematic diagram of the time-frequency resources of the downlink signal and the uplink signal in an embodiment of this application;

[0047] Figure 7 This is another structural diagram of the communication device in the embodiments of this application;

[0048] Figure 8 This is another structural diagram of the communication device in the embodiments of this application;

[0049] Figure 9 This is another structural diagram of the communication device in the embodiments of this application;

[0050] Figure 10 This is another structural diagram of the communication device in the embodiments of this application;

[0051] Figure 11 This is a schematic diagram of the time-frequency resources of various signals in the embodiments of this application;

[0052] Figure 12 This is a flowchart of a communication method in an embodiment of this application;

[0053] Figure 13 This is another flowchart of the communication method in the embodiments of this application. Detailed Implementation

[0054] The communication method in this application can be applied to communication devices in FDD systems. The communication device can be a base station, an evolved NodeB (eNodeB), a transmission reception point (TRP), a next-generation NodeB (gNB) in a 5th generation (5G) mobile communication system, a next-generation base station in a 6th generation (6G) mobile communication system, a base station in a future mobile communication system, or an access node in a WiFi system; it can also be a module or unit that performs some of the functions of a base station, for example, it can be a central unit (CU) or a distributed unit (DU). The CU here performs the functions of the radio resource control protocol and packet data convergence protocol (PDCP) of the base station, and can also perform the functions of the service data adaptation protocol (SDAP). The DU performs the functions of the radio link control layer and medium access control (MAC) layer of the base station, and can also perform some or all of the physical layer functions. For specific descriptions of the above-mentioned protocol layers, please refer to the relevant technical specifications of the 3rd Generation Partnership Project (3GPP). The communication device can be a macro base station, a micro base station, an indoor station, a relay node, or a donor node, etc. The embodiments of this application do not limit the specific technology and specific equipment form used in the communication device.

[0055] See Figure 1 In one embodiment, the communication device includes a transmitting module 110, a feedback module 120, a digital processing module 130, a receiving module 140, a duplexer 150, and an antenna array 160. The receiving module 140, duplexer 150, and antenna array 160 are optional.

[0056] The transmitting module 110 is used to transmit a first sensing signal through the downlink frequency band, the feedback module 120 is used to receive a second sensing signal through the downlink frequency band, convert the second sensing signal into a first digital signal, and the digital processing module 130 is used to perform radar sensing based on the first digital signal.

[0057] The second sensing signal is obtained by reflecting the first sensing signal from the environment, and its downlink frequency band is the FDD band. Both the first and second sensing signals are pulse wave signals. The time period for transmitting the first sensing signal or receiving the second sensing signal includes one or more time-domain resources. Time-domain resources can be OFDM symbols, time slots, subframes, or frames. Optionally, a switching period may also be included between the time period for transmitting the first sensing signal and the time period for receiving the second sensing signal. This can reduce mutual interference between the transmitted and received sensing signals and also reduce multipath interference.

[0058] Optionally, the digital processing module 130 is specifically used to perform one or more of the following based on the first digital signal: channel estimation, spectrum estimation, CFAR detection, velocity estimation, angle estimation, or range estimation. Channel estimation is the estimation of model parameters of a hypothetical channel model from the received signal; it is used to obtain the impulse response of the channel and provide channel state information for subsequent coherent demodulation. Spectrum estimation is the estimation of the power spectral density of the signal. CFAR detection refers to the technique of distinguishing between target signals and noise while maintaining a constant false alarm probability to determine the presence of a target signal. The digital processing module 130 can also perform intermediate frequency processing on the digital signal, such as filtering, predistortion, and correction.

[0059] The receiving module 140 is used to receive uplink data. The duplexer 150 is used to isolate the frequencies of the transmitting and receiving channels to prevent downlink and uplink signals from interfering with each other. The antenna array 160 is used to radiate the wireless signals transmitted by the base station into space or to receive wireless signals from user equipment in space.

[0060] See Figure 2 In one optional embodiment, the transmitting module 110 includes a first signal conversion unit 111 and a circulator 112, and the feedback module 120 includes a second signal conversion unit 121, a first switch 122, a low-noise amplifier 123, and a second switch 124.

[0061] The digital processing module 130 is connected to the first switch 122 and the second switch 124 to control the switches to close or open. When the second switch 124 connects the circulator 112 and the low-noise amplifier 123 and the first switch 122 connects the second signal conversion unit 121 and the low-noise amplifier 123, the low-noise amplifier 123 is used to amplify the second sensing signal from the circulator 112; the second signal conversion unit 121 is used to convert the second sensing signal amplified by the low-noise amplifier 123 into a first digital signal.

[0062] The circulator 112 directs the signal from one port to the next, preventing reverse signal transmission. It also prevents antenna standing wave reflections from affecting the downlink signal. The low-noise amplifier 123 amplifies the signal from the duplexer 150 and reduces noise, improving the signal-to-noise ratio. When the first switch 122 is connected to terminal b and the second switch 124 is connected to terminal a, the first switch 122 connects the second signal conversion unit 121 to the low-noise amplifier 123, and the second switch 124 connects the circulator 112 to the low-noise amplifier 123. Optionally, the first or second switch can be a switching switch, which may be, but is not limited to, a single-pole double-throw switch.

[0063] In this embodiment, the communication device can acquire sensing signals from the downlink frequency band based on the circulator 112 and the feedback module 120, thus providing a way to implement radar sensing.

[0064] See Figure 3 In one optional embodiment, the first signal conversion unit 111 includes a digital-to-analog converter 301, a mixer 302, and a power amplifier 303, and the second signal conversion unit 121 includes an analog-to-digital converter 304 and a mixer 305. The receiving module 140 includes an analog-to-digital converter 306, a mixer 307, and a low-noise amplifier 308. When the first switch 122 connects the second signal conversion unit 121 and the low-noise amplifier 123, the first switch 122 is specifically used to connect the mixer 305 in the second signal conversion unit 121.

[0065] The digital-to-analog converter 301 converts digital signals into analog signals. Mixers 302, 305, or 307 convert analog signals to digital signals, including up-conversion or down-conversion. The power amplifier 303 amplifies the signal output from mixer 302. The analog-to-digital converter 304 converts analog signals into digital signals. The low-noise amplifier 308 amplifies the uplink signal from duplexer 150, mixer 307 converts the signal from low-noise amplifier 308 to digital signals, and analog-to-digital converter 306 converts the frequency-converted signal from mixer 307 into a digital signal, which is then sent to digital processing module 130. Digital processing module 130 performs baseband processing on the digital signal, such as decoding, demodulation, and demultiplexing.

[0066] See Figure 4In an optional embodiment, when the first switch 122 connects the second signal conversion unit 121 and the first signal conversion unit 111 and the second switch 124 grounds the circulator 112, the first signal conversion unit 111 is used to convert the digital signal to be processed into a first analog signal; the second signal conversion unit 121 is also used to convert the first analog signal into a second digital signal; after the digital processing module 130 performs data predistortion processing on the second digital signal, the first signal conversion unit 111 is also used to convert the data predistortion processed second digital signal into a first sensing signal.

[0067] When the first switch 122 is connected to end a and the second switch 124 is connected to end b, the first switch 122 connects the second signal conversion unit 121 and the first signal conversion unit 111, and the second switch 124 connects the circulator 112 and ground.

[0068] This embodiment provides a method for performing data predistortion processing on transmitted sensing signals. Performing digital predistortion processing on the signal before transmission ensures that the transmitted signal retains its fidelity.

[0069] In an optional embodiment, when the first switch 122 connects the second signal conversion unit 121 and the first signal conversion unit 111 and the second switch 124 grounds the circulator 112, the first signal conversion unit 111 is further configured to convert the downlink signal to be processed into a second analog signal; the second signal conversion unit 121 is further configured to convert the second analog signal into a third digital signal; the data processing module 130 is further configured to perform digital predistortion processing on the second downlink data; the first signal conversion unit 111 is further configured to convert the third digital signal after data predistortion processing into a target downlink signal and send the target downlink signal to the circulator 112; the circulator 112 is configured to output the target downlink signal.

[0070] When the first switch 122 is connected to end a and the second switch 124 is connected to end b, the first switch 122 connects the second signal conversion unit 121 and the first signal conversion unit 111, and the second switch 124 connects the circulator 112 and ground.

[0071] In this embodiment, the communication device can perform data pre-distortion processing on the downlink signal before sending it to reduce the distortion of the downlink signal.

[0072] In another embodiment, the receiving module 140 is further configured to receive a first uplink signal via an uplink frequency band during a target time period; the feedback module 120 is further configured to receive a second uplink signal via a downlink frequency band during the target time period.

[0073] Specifically, the second switch 124 is used to connect the circulator 112 and the low-noise amplifier 123 during the target time period; the circulator 112 is used to receive the second uplink signal through the downlink frequency band during the target time period; the low-noise amplifier 123 is used to amplify the second uplink signal from the circulator 112; the first switch 122 is used to connect the second signal conversion unit 121 and the low-noise amplifier 123 during the target time period; the second signal conversion unit 121 is used to convert the second uplink signal amplified by the low-noise amplifier 123 into a fourth digital signal.

[0074] Specifically, when the first switch 122 is connected to terminal b and the second switch 124 is connected to terminal a, the first switch 122 connects the second signal conversion unit 121 and the low-noise amplifier 123, and the second switch 124 connects the circulator 112 and the low-noise amplifier 123. The target time period includes one or more time-domain resources.

[0075] In this embodiment, the communication device can simultaneously receive uplink signals through the uplink and downlink frequency bands of FDD, thus achieving supplementary uplink functionality, expanding the uplink communication range, and improving uplink speed.

[0076] The time-frequency resources of the signal in this application are described below. (See attached document.) Figure 5 In one embodiment, the time domain resources of the downlink signal are a third time period, and the frequency domain resources of the downlink signal are a downlink frequency band. The time domain resources of the first sensing signal are a first time period, and the frequency domain resources of the first sensing signal are a downlink frequency band. The time domain resources of the second sensing signal are a second time period, and the frequency domain resources of the second sensing signal are a downlink frequency band. A switching period is included between the first and second time periods. After the second time period, some time domain symbols can be reserved for transmitting other signals, thus allowing time-division multiplexing of downlink and sensing signals. The communication device can receive uplink signals through the uplink frequency band throughout the entire time period.

[0077] See Figure 6 In one embodiment, downlink signals are transmitted via the downlink band and uplink signals are received via the uplink band during the third time period. Uplink signals are received via the uplink band during the fourth time period. This allows for time-division multiplexing of downlink and uplink signals.

[0078] The above describes the time-division multiplexing of the first and second sensing signals by the communication device. The following describes the frequency-division multiplexing of the first and second sensing signals by the communication device. (See reference...) Figure 7 In one optional embodiment, the transmitting module 710 is used to transmit a first sensing signal through a first downlink frequency band during a first time period; the feedback module 720 is used to receive a second sensing signal through a second downlink frequency band during the first time period, convert the second sensing signal into a first digital signal, and the digital processing module 730 is used to perform radar sensing based on the first digital signal.

[0079] Wherein, both the first sensing signal and the second sensing signal are signals used for radar sensing, and the second sensing signal is obtained by reflecting the first sensing signal from the environment. Optionally, both the first sensing signal and the second sensing signal are continuous wave signals. Both the first downlink frequency band and the second downlink frequency band are FDD frequency bands. The first time period includes one or more time-domain resources.

[0080] In this embodiment, the communication device can transmit and receive sensing signals in different downlink frequency bands, and perform radar sensing based on the digital signals corresponding to the sensing signals.

[0081] See Figure 8 In one optional embodiment, the transmitting module 710 includes a first signal conversion unit 711 and a circulator 712, and the feedback module 720 includes a second signal conversion unit 721, a first switch 722, a second switch 724, and a low-noise amplifier 723. The first switch 722 and the second switch 724 are both switches corresponding to the receiving antenna. The first switch 722 is used to connect the circulator 712 and the low-noise amplifier 723 during a first time period; the second switch 724 is used to connect the second signal conversion unit 721 and the low-noise amplifier 723 during the first time period; the low-noise amplifier 723 is used to amplify the second sensing signal from the circulator 712; and the second signal conversion unit 721 is used to convert the signal amplified by the low-noise amplifier 723 into a first digital signal.

[0082] See Figure 9 In another optional embodiment, the first signal conversion unit 711 includes a digital-to-analog converter 901, a mixer 902, and a power amplifier 903, and the second signal conversion unit 721 includes an analog-to-digital converter 904 and a mixer 905. The receiving module 740 includes an analog-to-digital converter 906, a mixer 907, and a low-noise amplifier 908. Specifically, when the first switch 722 connects the second signal conversion unit 721 and the low-noise amplifier 723 during the second time period, the first switch 722 is used to connect the mixer 905 in the second signal conversion unit 721. The functions of each device in this embodiment can be found in the corresponding descriptions above.

[0083] See Figure 10In another optional embodiment, the feedback module 720 further includes a third switch 725 and a fourth switch 726, both of which are switches corresponding to the transmitting surface; the third switch 725 is used to connect the second signal conversion unit 721 and the first signal conversion unit 711 during the first time period, and the fourth switch 726 is used to ground the circulator 712 during the first time period; the first signal conversion unit 711 is used to convert the digital signal to be processed into a first analog signal; the second signal conversion unit 721 is also used to convert the first analog signal into a second digital signal; after the digital processing module 730 performs data pre-distortion processing on the second digital signal, the first signal conversion unit 711 is also used to convert the data pre-distortion processed second digital signal into a first sensing signal.

[0084] It should be noted that the first switch 722 and the third switch 725 can belong to the same switch module, and the second switch 724 and the fourth switch 726 can belong to the same switch module. The entire antenna array refers to the antenna array of the communication device. The receiving antenna array is the part of the antenna array corresponding to the receiving channel, and the transmitting antenna array is the part of the antenna array corresponding to the transmitting channel.

[0085] In another alternative embodiment, both the first switch 722 and the third switch 725 are used to connect the second signal conversion unit 721 and the first signal conversion unit 711 during the second time period; both the second switch 724 and the fourth switch 726 are used to ground the circulator 712 during the second time period; the first signal conversion unit 711 is used to convert the downlink signal to be processed into a second analog signal; the second signal conversion unit 721 is also used to convert the second analog signal into a third digital signal; after the digital processing module 730 performs data predistortion processing on the third digital signal, the first signal conversion unit 711 is also used to convert the data predistortion processed third digital signal into a target downlink signal and send the target downlink signal to the circulator 712; the circulator 712 is used to output the target downlink signal. This allows downlink signals to be transmitted in parallel via the first downlink frequency band and the second downlink frequency band, and the second time period for transmitting the downlink signal is different from the first time period for transmitting the sensing signal.

[0086] The time-frequency resources for frequency division transmission signals are described below. Please refer to [link / reference]. Figure 11 In one embodiment, downlink signals are transmitted via a downlink frequency band and uplink signals are received via an uplink frequency band during a second time period. A first sensing signal is transmitted via one downlink frequency band during a first time period, a second sensing signal is transmitted via another downlink frequency band during the same first time period, and uplink signals are received via an uplink frequency band during the same first time period.

[0087] It should be noted that the second time period is any time period different from the first time period. The second time period can be before or after the first time period.

[0088] The following is based on Figures 2-6 The communication apparatus shown illustrates the communication method in this application; see reference. Figure 12 In one optional embodiment, the communication method in this application includes the following steps:

[0089] S1201, Transmit the first sensing signal via the FDD downlink frequency band.

[0090] S1202, Receive the second sensing signal via the FDD downlink frequency band.

[0091] Optionally, both the first sensing signal and the second sensing signal are pulse wave signals.

[0092] S1203. Convert the second sensing signal into a first digital signal.

[0093] Optionally, S1203 includes: amplifying the second sensing signal and converting the amplified second sensing signal into a first digital signal. This amplification of the sensing signal improves the accuracy of the sensing signal detection.

[0094] S1204. Perform radar sensing based on the first digital signal.

[0095] Specifically, S1204 includes: performing one or more of the following based on the first digital signal: channel estimation, spectrum estimation, CFAR detection, velocity estimation, angle estimation, or distance estimation.

[0096] In this embodiment, the communication device can receive sensing signals from the downlink frequency band and perform radar sensing based on the digital signals corresponding to the sensing signals.

[0097] In an optional embodiment, a switching period is included between the period for transmitting the first sensing signal and the period for receiving the second sensing signal. The switching period includes one or more time-domain resources. This reduces mutual interference between the transmitted and received sensing signals, and also reduces multipath interference.

[0098] In another optional embodiment, the communication method of this application further includes: converting the digital signal to be processed into a first analog signal; converting the first analog signal into a second digital signal; performing data pre-distortion processing on the second digital signal; and converting the data pre-distorted second digital signal into a first sensing signal. This allows for data pre-distortion processing of the sensing signal, thereby reducing distortion.

[0099] In another optional embodiment, the communication method of this application further includes: converting the downlink signal to be processed into a second analog signal; converting the second analog signal into a third digital signal; performing data predistortion processing on the third digital signal; and converting the data predistortion processed third digital signal into a target downlink signal. This allows for data predistortion processing of the downlink signal, thereby reducing downlink signal distortion.

[0100] In another optional embodiment, the communication method of this application further includes: receiving a first uplink signal via an uplink frequency band during a fourth time period; and receiving a second uplink signal via a downlink frequency band during the fourth time period. This allows for simultaneous reception of uplink signals using both the uplink and downlink frequency bands, thereby achieving supplementary uplink functionality and effectively expanding the uplink range and increasing uplink speed.

[0101] The following is based on Figures 7-10 The communication apparatus shown illustrates the communication method in this application; see reference. Figure 13 In another alternative embodiment, the communication method in this application includes the following steps:

[0102] S1301, transmit the first sensing signal through the first FDD downlink frequency band during the first time period.

[0103] S1302, Receive the second sensing signal through the second FDD downlink frequency band during the first time period.

[0104] Both the first sensing signal and the second sensing signal are continuous wave signals. The first FDD downlink frequency band and the second FDD downlink frequency band include one or more frequency domain resources, which are carriers or subcarriers. The first time period includes at least one time domain resource, which is an OFDM symbol, a time slot, a subframe, or a frame.

[0105] S1303, Convert the second sensing signal into a first digital signal.

[0106] Optionally, S1303 includes: amplifying the second sensing signal and converting the amplified second sensing signal into a first digital signal. Amplifying the sensing signal can improve the detection accuracy of the sensing signal.

[0107] S1304. Perform radar sensing based on the first digital signal.

[0108] Optionally, S1304 includes: radar sensing based on the first digital signal, including: channel estimation, spectrum estimation, CFAR detection, angle estimation, velocity estimation, or range estimation based on the first digital signal.

[0109] In this embodiment, the communication device can transmit and receive sensing signals in different downlink frequency bands, and perform radar sensing based on the digital signals corresponding to the sensing signals.

[0110] In another optional embodiment, the communication method of this application further includes: converting the digital signal to be processed into a first analog signal; converting the first analog signal into a second digital signal; performing data pre-distortion processing on the second digital signal; and converting the data pre-distorted second digital signal into a first sensing signal. This allows for data pre-distortion processing of the sensing signal, reducing distortion.

[0111] In another optional embodiment, the communication method of this application further includes: converting the downlink signal to be processed into a second analog signal; converting the second analog signal into a third digital signal; performing data predistortion processing on the third digital signal; converting the data predistorted third digital signal into a target downlink signal; and transmitting the target downlink signal. This allows for data predistortion processing of the downlink signal to reduce distortion. Furthermore, the downlink signal can be transmitted in parallel using a first downlink frequency band and a second downlink frequency band, and the second time period for transmitting the downlink signal differs from the first time period for transmitting the sensing signal.

[0112] The number of time-domain resources included in the first time period, second time period, third time period, fourth time period or target time period in this application can be set according to the actual situation, and this application does not limit it.

[0113] This application also provides a computer program product containing instructions. The computer program product may be software or program products containing instructions, capable of running on a computing device or stored on any usable medium. When the computer program product is run on at least one computing device, it causes the at least one computing device to execute the communication method of this application.

[0114] This application also provides a computer-readable storage medium. The computer-readable storage medium can be any available medium capable of being stored by a computing device, or a data storage device such as a data center containing one or more available media. The available medium can be a magnetic medium (e.g., floppy disk, hard disk, magnetic tape), an optical medium (e.g., DVD), or a semiconductor medium (e.g., solid-state drive). The computer-readable storage medium includes instructions that instruct the computing device to execute the communication method of this application.

[0115] The terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments described herein can be implemented in a sequence other than that illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0116] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the embodiments of the present invention.

Claims

1. A communication device, characterized in that, include: The transmitting module is used to transmit the first sensing signal via the downlink frequency band; The feedback module is used to receive a second sensing signal through the downlink frequency band, convert the second sensing signal into a first digital signal, wherein the second sensing signal is obtained by reflecting the first sensing signal through the environment, and the downlink frequency band is a frequency division duplex (FDD) frequency band. A digital processing module is used for radar sensing based on the first digital signal.

2. The apparatus according to claim 1, characterized in that, Both the first sensing signal and the second sensing signal are pulse wave signals.

3. The apparatus according to any one of claims 1 to 2, characterized in that, The transmitting module includes a first signal conversion unit and a circulator, and the feedback module includes a second signal conversion unit, a first switch, a low-noise amplifier, and a second switch. When the second switch connects the circulator and the low-noise amplifier and the first switch connects the second signal conversion unit and the low-noise amplifier, the low-noise amplifier is used to amplify the second sensing signal from the circulator; The second signal conversion unit is used to convert the second sensing signal amplified by the low-noise amplifier into a first digital signal.

4. The apparatus according to claim 3, characterized in that, When the first switch connects the second signal conversion unit to the first signal conversion unit and the second switch grounds the circulator, the first signal conversion unit is also used to convert the digital signal to be processed into a first analog signal; The second signal conversion unit is used to convert the first analog signal into a second digital signal; After the digital processing module performs data predistortion processing on the second digital signal, the first signal conversion unit is further configured to convert the data predistortion processed second digital signal into the first sensing signal.

5. The apparatus according to claim 3, characterized in that, When the first switch connects the second signal conversion unit to the first signal conversion unit and the second switch grounds the circulator, the first signal conversion unit is also used to convert the downlink signal to be processed into a second analog signal; The second signal conversion unit is further configured to convert the second analog signal into a third digital signal; After the digital processing module performs data predistortion processing on the third digital signal, the first signal conversion unit is further configured to convert the data predistortion processed third digital signal into a target downlink signal and send the target downlink signal to the circulator. The circulator is used to output the target downlink signal.

6. The apparatus according to claim 1 or 2, characterized in that, The device further includes a receiving module, which is used to receive a first uplink signal via an uplink frequency band during a target time period. The feedback module is also used to receive a second uplink signal via the downlink frequency band during the target time period.

7. The apparatus according to any one of claims 3 to 6, characterized in that, Both the first switch and the second switch are toggle switches.

8. The apparatus according to any one of claims 1 to 7, characterized in that, The digital processing module is specifically used to perform spectral estimation, constant false alarm rate (CFAR) detection, or channel estimation based on the first digital signal.

9. A communication device, characterized in that, include: The transmitting module is used to transmit a first sensing signal via a first downlink frequency band during the first time period; The feedback module is used to receive the second sensing signal through the second downlink frequency band during the first time period, and convert the second sensing signal into a first digital signal. The second sensing signal is obtained by reflecting the first sensing signal through the environment. Both the first downlink frequency band and the second downlink frequency band are frequency division duplex (FDD) frequency bands. A digital processing module is used for radar sensing based on the first digital signal.

10. The apparatus according to claim 9, characterized in that, Both the first sensing signal and the second sensing signal are continuous wave signals.

11. The apparatus according to claim 9 or 10, characterized in that, The transmitting module includes a first signal conversion unit and a circulator, and the feedback module includes a second signal conversion unit, a first switch, a second switch, and a low-noise amplifier. The first switch and the second switch are both switches corresponding to the receiving antenna. The first switch is used to connect the circulator and the low-noise amplifier during the first time period; The low-noise amplifier is used to amplify the second sensing signal from the circulator; The second switch is used to connect the second signal conversion unit and the low-noise amplifier during the first time period; The second signal conversion unit is used to convert the signal amplified by the low-noise amplifier into a first digital signal.

12. The apparatus according to claim 11, characterized in that, The feedback module also includes a third switch and a fourth switch, both of which are switches corresponding to the launch surface. The third switch is used to connect the second signal conversion unit and the first signal conversion unit during the first time period, and the fourth switch is used to ground the circulator during the first time period; The first signal conversion unit is used to convert the digital signal to be processed into a first analog signal; The second signal conversion unit is further configured to convert the first analog signal into a second digital signal; After the digital processing module performs data predistortion processing on the second digital signal, the first signal conversion unit is further configured to convert the data predistortion processed second digital signal into the first sensing signal.

13. The apparatus according to claim 11 or 12, characterized in that, Both the first switch and the third switch are used to connect the second signal conversion unit and the first signal conversion unit during the second time period, and both the second switch and the fourth switch are used to ground the circulator during the second time period. The first signal conversion unit is used to convert the downlink signal to be processed into a second analog signal; The second signal conversion unit is further configured to convert the second analog signal into a third digital signal; After the digital processing module performs data predistortion processing on the third digital signal, the first signal conversion unit is further configured to convert the data predistortion processed third digital signal into a target downlink signal and send the target downlink signal to the circulator. The circulator is used to output the target downlink signal.

14. A communication method for a frequency division duplex (FDD) system, characterized in that, include: The first sensing signal is transmitted via the FDD downlink frequency band; The second sensing signal is received via the FDD downlink frequency band; The second sensing signal is converted into a first digital signal; Radar sensing is performed based on the first digital signal; The second sensing signal is obtained by reflecting the first sensing signal through the environment.

15. The method according to claim 14, characterized in that, Both the first sensing signal and the second sensing signal are pulse wave signals.

16. The method according to any one of claims 14 to 15, characterized in that, The step of converting the second sensing signal into a first digital signal includes: The second sensing signal is amplified, and the amplified second sensing signal is converted into a first digital signal.

17. The method according to any one of claims 14 to 16, characterized in that, The method further includes: Convert the digital signal to be processed into a first analog signal; Convert the first analog signal into a second digital signal; Perform data predistortion processing on the second digital signal; The second digital signal, after data predistortion processing, is converted into the first sensing signal.

18. The method according to any one of claims 14 to 17, characterized in that, The method further includes: Convert the downlink signal to be processed into a second analog signal; Convert the second analog signal into a third digital signal; Perform data predistortion processing on the third digital signal; The third digital signal after data predistortion processing is converted into the target downlink signal.

19. The method according to any one of claims 14 to 15, characterized in that, The method further includes: Receive the first uplink signal via the uplink frequency band during the target time period; The second uplink signal is received via the downlink frequency band during the target time period.

20. The method according to any one of claims 14 to 19, characterized in that, The radar sensing based on the first digital signal includes: Channel estimation, spectral estimation, or constant false alarm rate (CFAR) detection are performed based on the first digital signal.

21. A communication method for a frequency division duplex (FDD) system, characterized in that, include: The first sensing signal is transmitted via the first downlink frequency band during the first time period; During the first time period, a second sensing signal is received via the second downlink frequency band; The second sensing signal is converted into a first digital signal; Radar sensing is performed based on the first digital signal; The second sensing signal is obtained by reflecting the first sensing signal through the environment, and both the first downlink frequency band and the second downlink frequency band are FDD frequency bands.

22. The method according to claim 21, characterized in that, Both the first sensing signal and the second sensing signal are continuous wave signals.

23. The method according to any one of claims 21 to 22, characterized in that, The step of converting the second sensing signal into a first digital signal includes: The second sensing signal is amplified, and the amplified second sensing signal is converted into a first digital signal.

24. The method according to any one of claims 21 to 23, characterized in that, The method further includes: Convert the digital signal to be processed into a first analog signal; Convert the first analog signal into a second digital signal; Perform data predistortion processing on the second digital signal; The second digital signal, after data predistortion processing, is converted into the first sensing signal.

25. The method according to any one of claims 21 to 24, characterized in that, The method further includes: Convert the downlink signal to be processed into a second analog signal; Convert the second analog signal into a third digital signal; Perform data predistortion processing on the third digital signal; The third digital signal after data predistortion processing is converted into the target downlink signal; Send the target downlink signal.

26. The method according to any one of claims 21 to 25, characterized in that, The radar sensing based on the first digital signal includes: Channel estimation, spectral estimation, or constant false alarm rate (CFAR) detection are performed based on the first digital signal.

27. A computer-readable storage medium, characterized in that, It includes computer program instructions, which, when executed by a communication device, perform the method as described in any one of claims 14 to 26.

28. A computer program product containing instructions, characterized in that, When the instruction is executed by the communication device, the communication device performs the method as described in any one of claims 14 to 26.

Images