Full-duplex communication system, full-duplex communication method and apparatus, and storage medium

Abstract

Disclosed in embodiments of the present application are a full-duplex communication system, a full-duplex communication method and apparatus, and a storage medium, used for eliminating the interference of downlink co-channel interference signals to uplink signals. The full-duplex communication system comprises: a radio frequency unit, used for sending a downlink signal to a terminal device by means of a transmission channel of the radio frequency unit; a radio frequency unit, used for receiving a downlink co-channel interference signal and an uplink signal from the terminal device, so as to obtain a received signal, wherein the downlink co-channel interference signal comprises: an interference signal generated by the radio frequency unit sending the downlink signal, and an interference signal generated by radio frequency units other than the radio frequency unit sending the downlink signal; a radio frequency unit, used for taking the downlink signal, which is sent by means of the transmission channel, as a reference signal, and acquiring a cancellation signal having an equal amplitude and an opposite phase with respect to the downlink co-channel interference signal; and a radio frequency unit, used for performing combination processing on the received signal and the cancellation signal, so as to eliminate the interference of the downlink co-channel interference signal to the uplink signal.

Description

A full-duplex communication system, a full-duplex communication method and device, and a storage medium

[0001] The present application claims priority to the Chinese Patent Application No. 202410867949.5, filed on June 29, 2024, and entitled "A Full-Duplex Communication System, a Full-Duplex Communication Method and Device, and a Storage Medium", the content of which is incorporated herein by reference in its entirety. TECHNICAL FIELD

[0002] The present application relates to the field of computer technology, in particular to a full-duplex communication system, a full-duplex communication method and device, and a storage medium. BACKGROUND

[0003] Future communication systems have higher demands for system capacity of wireless transmission. Unlike current frequency division multiplexing and time division multiplexing transmission mode communication systems, full-duplex communication systems use full-duplex communication mode, which can simultaneously transmit and receive on the same frequency, thus having higher spectral efficiency and energy efficiency.

[0004] The full-duplex communication system uses a combination of full-duplex technology and antenna remote technology, and by distributing the radio frequency unit with only receiving (Rx-only) or only transmitting mode (Tx-only) in the cell, the network coverage of the full-duplex communication system can be expanded.

[0005] However, the downlink signal generated by the only transmitting radio frequency unit will cause strong interference to the same frequency uplink signal, resulting in problems such as noise lifting, increased digital quantization error, even radio frequency link nonlinearity, and saturation of received baseband data for the only receiving radio frequency unit, affecting the normal operation of the full-duplex communication system.

[0006] Therefore, how to eliminate the strong co-frequency self-interference of the full-duplex communication system has become a technical problem to be solved in the field. SUMMARY

[0007] The embodiments of the present application provide a full-duplex communication system, a full-duplex communication method and device, and a storage medium, which are used to eliminate the interference of downlink co-frequency interference signals to uplink signals.

[0008] To solve the above technical problems, the embodiments of the present application provide the following technical solutions:

[0009] In a first aspect, the embodiments of the present application provide a full-duplex communication system, which comprises a radio frequency unit, wherein,

[0010] The radio frequency unit is configured to send a downlink signal to a terminal device through a transmitting channel of the radio frequency unit.

[0011] The radio frequency unit is configured to receive a downlink co-frequency interference signal and an uplink signal from the terminal device to obtain a received signal, wherein the downlink co-frequency interference signal comprises an interference signal generated by the radio frequency unit transmitting the downlink signal and an interference signal generated by another radio frequency unit transmitting a downlink signal;

[0012] The radio frequency unit is configured to obtain a cancellation signal that is equal in amplitude and opposite in phase to the downlink co-frequency interference signal, with the downlink signal transmitted through the transmission channel as a reference signal.

[0013] The radio frequency unit is configured to perform a combination process on the received signal and the cancellation signal to eliminate the interference of the downlink co-frequency interference signal on the uplink signal.

[0014] In the above scheme, the radio frequency unit can be used to cancel the radio frequency interference from other radio frequency units, reduce the co-frequency interference strength from other radio frequency units in the full-duplex communication system, thereby suppressing the strong self-interference in the full-duplex communication system, and solving the problems of bottom noise lifting, digital quantization error increasing, even radio frequency link nonlinearity, and saturation of received baseband data.

[0015] In a possible implementation of the first aspect, the radio frequency unit is specifically configured to obtain a received power of the received signal; adjust a reference signal according to the received power, with the downlink signal transmitted through the transmission channel as the reference signal; obtain a cancellation weight according to the adjusted reference signal when the received power is less than a power threshold; and obtain the cancellation signal according to the cancellation weight. In the above scheme, the radio frequency unit has the function of generating the cancellation signal, so that the cancellation signal can be used to suppress the strong self-interference in the full-duplex communication system.

[0016] In a possible implementation of the first aspect, the full-duplex communication system further comprises a baseband processing unit, and the radio frequency unit comprises a radio frequency switch and a radio frequency transmission link.

[0017] The baseband processing unit is configured to generate a downlink baseband signal, and the downlink baseband signal is input into the radio frequency unit through the transmission channel.

[0018] The radio frequency switch is configured to turn on the transmission channel and the radio frequency transmission link.

[0019] The radio frequency transmission link is configured to convert the downlink baseband signal into the downlink signal and transmit the downlink signal.

[0020] In the scheme, a radio frequency switch can be arranged in the radio frequency unit, the radio frequency switch is used for connecting the transmission channel and a radio frequency transmission link, and the radio frequency transmission link is used for transmitting the downlink signal, so as to realize the downlink signal transmission of the radio frequency unit in the only transmission mode.

[0021] In a possible implementation of the first aspect, the radio frequency unit further includes a radio frequency receiving link and a cancellation module.

[0022] The radio frequency switch is used for connecting the transmission channel and the cancellation module.

[0023] The radio frequency receiving link is used for receiving the uplink signal from the terminal device and receiving the downlink co-frequency interference signal.

[0024] In the scheme, a radio frequency switch can be arranged in the radio frequency unit, the radio frequency switch is used for connecting the transmission channel and a radio frequency transmission link, and the radio frequency transmission link is used for transmitting the downlink signal, so as to realize the downlink signal transmission of the radio frequency unit in the only transmission mode.

[0025] In a possible implementation of the first aspect, the cancellation module is used for taking the downlink signal transmitted through the transmission channel as a reference signal, and obtaining a cancellation signal which is equal in amplitude and opposite in phase to the downlink co-frequency interference signal.

[0026] In the scheme, a radio frequency switch can be arranged in the radio frequency unit, the radio frequency switch is used for connecting the transmission channel and a radio frequency transmission link, and the radio frequency transmission link is used for transmitting the downlink signal, so as to realize the downlink signal transmission of the radio frequency unit in the only transmission mode.

[0027] In a possible implementation of the first aspect, the radio frequency unit includes a radio frequency switch, a radio frequency transmission link, a radio frequency receiving link and a cancellation module.

[0028] The radio frequency switch is used for connecting the transmission channel and the radio frequency transmission link.

[0029] The radio frequency transmission link is used for transmitting the downlink signal.

[0030] The radio frequency switch is used for switching from being connected with the radio frequency transmission link to being connected with the cancellation module.

[0031] The radio frequency receiving link is used for receiving the uplink signal from the terminal device and receiving the downlink co-frequency interference signal.

[0032] The cancellation module is used for taking the downlink signal transmitted through the transmission channel as a reference signal, and obtaining a cancellation signal which is equal in amplitude and opposite in phase to the downlink co-frequency interference signal.

[0033] In the scheme, the radio frequency switch has a switching function, and the radio frequency switch is switched from being connected with the radio frequency transmitting link to being connected with the cancellation module, so that the cancellation module can receive the reference signal of the radio frequency transmitting link. The cancellation module has a function of generating a cancellation signal, and the cancellation module takes the downlink signal sent through the transmitting channel as the reference signal to obtain the cancellation signal that is equal in amplitude and opposite in phase to the downlink co-frequency interference signal. In the embodiment of the application, the cancellation module can be arranged in the radio frequency unit to generate the cancellation signal.

[0034] In a possible implementation of the first aspect, the radio frequency unit further includes: a system on chip (SOC), a radio on chip (ROC), and a low noise amplifier (LNA); and the radio frequency transmitting link includes: a power amplifier and an antenna.

[0035] The SOC is connected with the ROC, the ROC is connected with the LNA, the LNA is connected with the radio frequency switch, the radio frequency switch is connected with the power amplifier, and the power amplifier is connected with the antenna.

[0036] The SOC is configured to perform modulation processing on the downlink baseband signal to obtain a downlink intermediate frequency signal.

[0037] The ROC is configured to perform up-conversion processing on the downlink intermediate frequency signal to obtain a downlink radio frequency signal, and send the downlink radio frequency signal to the LNA.

[0038] The LNA is configured to perform low noise amplification on the downlink radio frequency signal to obtain a low noise amplified downlink radio frequency signal.

[0039] The radio frequency switch is configured to turn on the LNA and the power amplifier.

[0040] The power amplifier is configured to perform power amplification on the low noise amplified downlink radio frequency signal to obtain the downlink signal.

[0041] The antenna is configured to send the downlink signal to the terminal device.

[0042] In the scheme, the radio frequency switch is located after the LNA and before the power amplifier, so that the embodiment of the application does not affect the radio frequency power of the radio frequency unit, and can reduce the influence of the cancellation on the received signal noise floor.

[0043] In a possible implementation of the first aspect, the radio frequency unit further includes: a combiner.

[0044] The combiner is configured to perform combining processing on the received signal and the cancellation signal.

[0045] In the above scheme, when the radio frequency unit is in the receiving-only mode, the radio frequency switch can be turned on to connect to the cancellation module, the cancellation module can generate a cancellation signal, and the cancellation module inputs the cancellation signal into the combiner, and the combiner performs combing processing on the received signal and the cancellation signal. In the embodiment of the present application, the radio frequency unit includes a combiner, and the combiner performs combing on the received signal and the cancellation signal, so that the strong self-interference in the full-duplex communication system can be suppressed.

[0046] In a possible implementation of the first aspect, the combiner is connected to the on-chip radio frequency chip.

[0047] The combiner is configured to send the uplink signal to the on-chip radio frequency chip.

[0048] The on-chip radio frequency chip is configured to perform down-conversion processing on the uplink signal to obtain an uplink intermediate frequency signal.

[0049] The on-chip system is configured to perform demodulation processing on the uplink intermediate frequency signal to obtain an uplink baseband signal, and send the uplink baseband signal to the baseband processing unit.

[0050] In the above scheme, when the radio frequency unit is in the receiving-only mode, the combiner performs combing processing on the received signal and the cancellation signal, so that the downlink co-frequency interference signal in the received signal can be eliminated, and the uplink signal is retained. The combiner is connected to the on-chip radio frequency chip, the combiner sends the uplink signal to the on-chip radio frequency chip, the on-chip radio frequency chip performs down-conversion processing on the uplink signal to obtain an uplink intermediate frequency signal, the on-chip system performs demodulation processing on the uplink intermediate frequency signal to obtain an uplink baseband signal, and the on-chip system can send the uplink baseband signal to the baseband processing unit, so that the baseband processing unit can receive the uplink baseband signal, and the radio frequency unit can complete the transmission of the uplink signal to the baseband processing unit.

[0051] In a second aspect, the embodiments of the present application further provide a full-duplex communication method, which is applied to a full-duplex communication system, and the full-duplex communication system includes a radio frequency unit. The method includes the following steps:

[0052] sending a downlink signal to a terminal device through a transmitting channel of the radio frequency unit;

[0053] receiving a downlink co-frequency interference signal and an uplink signal from the terminal device to obtain a received signal, wherein the downlink co-frequency interference signal includes an interference signal generated by the radio frequency unit sending the downlink signal and an interference signal generated by another radio frequency unit sending a downlink signal;

[0054] taking the downlink signal sent through the transmitting channel as a reference signal, and obtaining a cancellation signal that is equal in amplitude and opposite in phase to the downlink co-frequency interference signal;

[0055] combining the received signal and the cancellation signal to eliminate the interference of the downlink co-frequency interference signal to the uplink signal.

[0056] In a possible implementation of the second aspect, the downlink signal transmitted through the transmission channel is a reference signal, and the cancellation signal that is equal in amplitude and opposite in phase to the downlink co-frequency interference signal is obtained, including:

[0057] obtaining a received power of the received signal;

[0058] adjusting the reference signal according to the received power, taking the downlink signal transmitted through the transmission channel as the reference signal;

[0059] obtaining a cancellation weight according to the adjusted reference signal, when the received power is less than a power threshold;

[0060] obtaining the cancellation signal according to the cancellation weight.

[0061] In a possible implementation of the second aspect, the full-duplex communication system further includes a baseband processing unit, and the radio frequency unit includes a radio frequency switch and a radio frequency transmission link;

[0062] The method further includes generating a downlink baseband signal through the baseband processing unit, and inputting the downlink baseband signal into the radio frequency unit through the transmission channel;

[0063] The transmitting the downlink signal to the terminal device through the transmission channel of the radio frequency unit includes:

[0064] When the radio frequency switch is turned on for the transmission channel and the radio frequency transmission link, converting the downlink baseband signal into the downlink signal through the radio frequency transmission link, and transmitting the downlink signal.

[0065] In a possible implementation of the second aspect, the radio frequency unit further includes a radio frequency receiving link and a cancellation module;

[0066] The receiving the downlink co-frequency interference signal and the uplink signal from the terminal device includes:

[0067] When the radio frequency switch is turned on for the receiving channel and the cancellation module, receiving the uplink signal from the terminal device and the downlink co-frequency interference signal through the radio frequency receiving link.

[0068] In a possible implementation of the second aspect, the downlink signal transmitted through the transmission channel is a reference signal, and the cancellation signal that is equal in amplitude and opposite in phase to the downlink co-frequency interference signal is obtained, including:

[0069] The cancellation module obtains a cancellation signal that is equal in amplitude and opposite in phase to the downlink co-frequency interference signal by taking the downlink signal transmitted through the transmission channel as a reference signal.

[0070] In a possible implementation of the second aspect, the radio frequency unit comprises a radio frequency switch, a radio frequency transmission link, a radio frequency reception link and a cancellation module.

[0071] The radio frequency unit transmits a downlink signal to a terminal device through a transmission channel, comprising: when the radio frequency switch connects the transmission channel to the radio frequency transmission link, the radio frequency transmission link transmits the downlink signal.

[0072] The radio frequency unit receives a downlink co-frequency interference signal and an uplink signal from the terminal device, comprising:

[0073] When the radio frequency switch is switched from being connected to the radio frequency transmission link to being connected to the cancellation module, the radio frequency reception link receives the uplink signal from the terminal device to receive the downlink co-frequency interference signal.

[0074] The cancellation module obtains a cancellation signal that is equal in amplitude and opposite in phase to the downlink co-frequency interference signal by taking the downlink signal transmitted through the transmission channel as a reference signal.

[0075] In a possible implementation of the second aspect, the radio frequency unit further comprises a system on chip (SOC), a radio on chip (ROC) and a low noise amplifier (LNA); and the radio frequency transmission link comprises a power amplifier and an antenna.

[0076] The SOC is connected to the ROC, the ROC is connected to the LNA, the LNA is connected to the radio frequency switch, the radio frequency switch is connected to the power amplifier, and the power amplifier is connected to the antenna.

[0077] The radio frequency switch connects the reception channel to the radio frequency transmission link, the radio frequency transmission link converts the first signal into the downlink signal, and the radio frequency transmission link transmits the downlink signal, comprising:

[0078] The SOC modulates the downlink baseband signal to obtain a downlink intermediate frequency signal.

[0079] The ROC up-converts the downlink intermediate frequency signal to obtain a downlink radio frequency signal, and transmits the downlink radio frequency signal to the LNA.

[0080] amplify the downlink radio frequency signal by the low noise amplifier to obtain a low noise amplified downlink radio frequency signal;

[0081] amplify the low noise amplified downlink radio frequency signal by the power amplifier to obtain the downlink signal when the radio frequency switch turns on the low noise amplifier and the power amplifier;

[0082] transmit the downlink signal to the terminal device by the antenna.

[0083] In a possible implementation manner of the second aspect, the radio frequency unit further includes a combiner.

[0084] combining the receive signal and the cancellation signal includes:

[0085] combining the receive signal and the cancellation signal by the combiner.

[0086] In a possible implementation manner of the second aspect, the combiner is connected to the on-chip radio frequency chip.

[0087] The method further includes:

[0088] transmitting the uplink signal to the on-chip radio frequency chip by the combiner;

[0089] down-converting the uplink signal by the on-chip radio frequency chip to obtain an uplink intermediate frequency signal;

[0090] demodulating the uplink intermediate frequency signal by the on-chip system to obtain an uplink baseband signal;

[0091] transmitting the uplink baseband signal to the baseband processing unit by the on-chip system.

[0092] In the second aspect of the present application, the full duplex communication method can also perform the function steps of the modules described in the foregoing first aspect and various possible implementation manners, and details are described in the foregoing description of the first aspect and various possible implementation manners.

[0093] In a third aspect, the embodiments of the present application provide a computer readable storage medium, the computer readable storage medium stores instructions, when the instructions run on a computer, the computer executes the method in the second aspect.

[0094] In a fourth aspect, the embodiments of the present application provide a computer program product containing instructions, when the instructions run on a computer, the computer executes the method in the second aspect.

[0095] In a fifth aspect, an embodiment of the present application provides a communication apparatus, which can include a terminal device or a chip or the like entity. The communication apparatus includes a processor and a memory. The memory is configured to store instructions. The processor is configured to execute the instructions in the memory, so that the communication apparatus performs the method in any one of the preceding second aspects.

[0096] In a sixth aspect, an embodiment of the present application provides a chip system, which includes a processor configured to support a full-duplex communication system to implement the functions involved in the preceding aspects, for example, to send or process the data and / or information involved in the preceding methods. In a possible design, the chip system further includes a memory configured to store the necessary program instructions and data of the full-duplex communication system. The chip system can be composed of a chip, or can include a chip and other discrete devices.

[0097] In a seventh aspect, an embodiment of the present application provides a chip, which includes one or more interface circuits and one or more processors. The interface circuit is configured to receive a signal from a memory of an electronic device, and send the signal to the processor. The signal includes computer instructions stored in the memory. When the processor executes the computer instructions, the electronic device performs the voice signal decoding method in the second aspect or any possible implementation manner of the second aspect.

[0098] The seventh aspect and any possible implementation manner of the seventh aspect correspond to the second aspect and any possible implementation manner of the second aspect respectively. For details, refer to the technical effects of the second aspect and any possible implementation manner of the second aspect, which are not described herein again. BRIEF DESCRIPTION OF DRAWINGS

[0099] FIG. 1 is a system architecture diagram of a full-duplex communication system according to an embodiment of the present application;

[0100] FIG. 2a is a schematic diagram of generation of same-frequency interference in a full-duplex communication system according to an embodiment of the present application;

[0101] FIG. 2b is a schematic diagram of generation of same-frequency interference in a full-duplex communication system according to an embodiment of the present application;

[0102] FIG. 3 is a component structure diagram of a full-duplex communication system according to an embodiment of the present application;

[0103] FIG. 4 is a component structure diagram of another full-duplex communication system according to an embodiment of the present application;

[0104] FIG. 5 is a component structure diagram of another full-duplex communication system according to an embodiment of the present application;

[0105] Fig. 6 is a structural diagram of another full-duplex communication system according to an embodiment of the present application;

[0106] Fig. 7 is a structural diagram of another full-duplex communication system according to an embodiment of the present application;

[0107] Fig. 8 is a structural diagram of another full-duplex communication system according to an embodiment of the present application;

[0108] Fig. 9 is a radio frequency cancellation hardware architecture diagram of a full-duplex communication system according to an embodiment of the present application;

[0109] Fig. 10 is a schematic diagram of generation of a same-frequency interference of a transceiver separation full-duplex communication system according to an embodiment of the present application;

[0110] Fig. 11 is an execution flow diagram of a cancellation module according to an embodiment of the present application;

[0111] Fig. 12 is a cancellation implementation flow diagram of an uplink state according to an embodiment of the present application;

[0112] Fig. 13 is a hardware architecture diagram of a cancellation module according to an embodiment of the present application;

[0113] Fig. 14 is a hardware architecture diagram of a cancellation module according to an embodiment of the present application;

[0114] Fig. 15 is a flow diagram of a full-duplex communication method according to an embodiment of the present application;

[0115] Fig. 16 is a structural diagram of a full-duplex communication system according to an embodiment of the present application. DETAILED DESCRIPTION

[0116] The embodiments of the present application provide a full-duplex communication system, a full-duplex communication method and device, and a storage medium, which are used to eliminate interference of a downlink same-frequency interference signal on an uplink signal.

[0117] The embodiments of the present application will be described below with reference to the accompanying drawings.

[0118] The terms "first", "second", and the like in the specification and claims of the present application and the above-described drawings are used to distinguish similar objects, and do not necessarily have to be used to describe a specific order or sequence. It should be understood that the terms thus used can be interchanged under appropriate circumstances, and are merely used to distinguish between objects having the same attribute in the description of the embodiments of the present application. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion, so that a process, method, system, product, or device including a series of units does not have to be limited to those units, but can include other units not clearly listed or inherent to the process, method, product, or device.

[0119] The technical solutions of the embodiments of the present application can be applied to various data processing communication systems, such as code division multiple access (CDMA), time division multiple access (TDMA), frequency division multiple access (FDMA), orthogonal frequency division multiple access (OFDMA), single carrier frequency division multiple access (SC-FDMA), and other systems. The term "system" can be replaced by "network". The CDMA system can implement wireless technologies such as universal terrestrial radio access (UTRA), CDMA2000, etc. UTRA can include wideband CDMA (WCDMA) technology and other CDMA variants. CDMA2000 can cover interim standard (IS) 2000 (IS-2000), IS-95 and IS-856 standards. The TDMA system can implement wireless technologies such as global system for mobile communication (GSM). The OFDMA system can implement wireless technologies such as evolved UTRA (E-UTRA), ultra mobile broadband (UMB), IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, Flash OFDMA, etc. UTRA and E-UTRA are UMTS and UMTS evolution versions. The 3GPP is long term evolution (LTE) and various versions based on LTE evolution, which are new versions of UMTS using E-UTRA. The fifth generation (5G) communication system, new radio (NR), is a next generation communication system under research. In addition, the communication system can also be applied to future-oriented communication technologies, and the technical solutions provided by the embodiments of the present application are applicable.The system architecture and business scenarios described in the embodiments of the present application are for more clearly illustrating the technical solutions of the embodiments of the present application, and do not constitute a limitation on the technical solutions provided by the embodiments of the present application. It can be known by those skilled in the art that, with the evolution of network architecture and the appearance of new business scenarios, the technical solutions provided by the embodiments of the present application are also applicable to similar technical problems.

[0120] A possible radio access network (RAN) of the embodiments of the present application. The RAN can be a base station access system of a 2G network (i.e., the RAN includes a base station and a base station controller), or can be a base station access system of a 3G network (i.e., the RAN includes a base station and a radio network controller (RNC)), or can be a base station access system of a 4G network (i.e., the RAN includes an eNB and an RNC), or can be a base station access system of a 5G network, or can be a base station access system of a future network.

[0121] The RAN includes one or more network devices. The network device can be any kind of device with wireless transceiver function, or a chip disposed in a device with specific wireless transceiver function. The network device includes but is not limited to: a base station (for example, a base station BS, a base station NodeB, an evolved NodeB eNodeB or eNB, a base station gNodeB or gNB in a 5th generation 5G communication system, a base station in a future communication system, an access node in a WiFi system, a wireless relay node, a wireless backhaul node), and the like. The base station can be: a macro base station, a micro base station, a pico base station, a femto base station, a relay station, and the like. The plurality of base stations can support a network of one or more of the above-mentioned technologies, or a future evolved network. The core network can support a network of one or more of the above-mentioned technologies, or a future evolved network. The base station can include one or more co-sited or non-co-sited transmission receiving points (TRPs). The network device can also be a wireless controller, a centralized unit (CU), or a distributed unit (DU) in a cloud radio access network (CRAN) scenario, and the like. The network device can also be a server, a wearable device, a vehicle-mounted device, and the like. Hereinafter, the network device is taken as an example of a base station for description. The plurality of network devices can be the same type of base station, or different types of base stations. The base station can communicate with the terminal device, or communicate with the terminal device through the relay station. The terminal device can support communication with a plurality of base stations of different technologies, for example, the terminal device can support communication with a base station supporting an LTE network, and can also support communication with a base station supporting a 5G network, and can also support dual connectivity with a base station of an LTE network and a base station of a 5G network. For example, the terminal is accessed to the RAN node of the wireless network. At present, some examples of the RAN node are: gNB, transmission reception point (TRP), evolved Node B (eNB), radio network controller (RNC), Node B (NB), base station controller (BSC), base transceiver station (BTS), home base station (for example, home evolved NodeB, or home Node B, HNB), base band unit (BBU), or wireless fidelity (WiFi) access point (AP), and the like.In one network structure, a network device can include a centralized unit (CU) node, or a distributed unit (DU) node, or a RAN device including a CU node and a DU node.

[0122] The network device provided by the embodiments of the present application can include a radio frequency unit, for example, the radio frequency unit can be distributedly configured to poll switch a radio frequency unit in a receive-only (Rx-only) and transmit-only (Tx-only) mode, and can expand the network coverage range in a targeted manner.

[0123] The terminal device in the embodiments of the present application, also known as user equipment (UE), mobile station (MS), mobile terminal (MT), terminal, etc., is a device that provides voice and / or data connectivity for a user, or a chip provided in the device, for example, a handheld device with wireless connection permission, a vehicle-mounted device, etc. At present, some examples of terminal devices are: mobile phones, tablet computers, notebook computers, palm computers, mobile internet devices (MIDs), wearable devices, virtual reality (VR) devices, augmented reality (AR) devices, wireless terminals in industrial control, wireless terminals in self driving, wireless terminals in remote medical surgery, wireless terminals in smart grids, wireless terminals in transportation safety, wireless terminals in smart cities, wireless terminals in smart homes, etc. The terminal device provided by the embodiments of the present application can be a low-complexity terminal device and / or a terminal device in a coverage enhancement A mode.

[0124] Embodiments of the present application provide a distributed full-duplex communication system, which can be the aforementioned RAN. The full-duplex communication system adopts a combination of full-duplex technology and antenna remote technology, and can expand the network coverage of the full-duplex communication system by distributing and configuring radio frequency units capable of switching between only-receiving (Rx-only) and only-transmitting (Tx-only) modes in a cell. However, the downlink signals generated by the radio frequency units in the only-transmitting mode can cause strong interference to the uplink signals of the same frequency, resulting in problems such as noise lifting, increased digital quantization error, even radio frequency link nonlinearity, and saturation of received baseband data for the radio frequency units in the only-receiving mode, which greatly affects the normal operation of the distributed full-duplex system. Therefore, it is necessary to effectively suppress the strong self-interference of the same frequency in the full-duplex communication system.

[0125] In a full-duplex communication system currently existing, a directional coupler is used to obtain a reference signal from the transmission channel signal, an attenuator and a phase shifter are used to adjust the reference signal, and finally the adjusted reference signal is combined to the receiving channel to obtain a combined signal, and the combined signal and the radio frequency signal received by the receiving channel are mutually canceled.

[0126] In the above technical solution, the reference signal can only be obtained from the local transmission channel of the transceiver in a coupled manner, and cannot cancel and suppress the interference signals from other same-frequency transmitters, and therefore cannot be applied to the distributed full-duplex communication system.

[0127] In view of the shortcomings in the above-mentioned technology, embodiments of the present application provide a scheme for canceling radio frequency interference from other same-frequency devices. As shown in the system architecture of a full-duplex communication system in FIG. 1, the full-duplex communication system includes a first radio frequency unit and a second radio frequency unit. The first radio frequency unit is hereinafter referred to as a radio frequency unit, and the second radio frequency unit can be another radio frequency unit other than the first radio frequency unit. The second radio frequency unit can be a radio frequency unit that causes same-frequency interference to the first radio frequency unit.

[0128] In the embodiments of the present application, the radio frequency unit has a full-duplex working mode, and the radio frequency unit can switch between only-receiving (Rx-only) and only-transmitting (Tx-only) modes. When the radio frequency unit is in the only-receiving mode, the radio frequency unit can be a receiver, and when the radio frequency unit is in the only-transmitting mode, the radio frequency unit can be a transmitter.

[0129] Please refer to FIG. 2a and FIG. 2b for an example of interference sources of the distributed full-duplex communication system. For example, in FIG. 2a, at time 1, the radio frequency unit 1 is in a transmitting mode, the radio frequency unit 2 is in a receiving mode, the radio frequency unit 1 transmits a downlink signal to a UE, and the UE transmits an uplink signal to the radio frequency unit 2, which causes the radio frequency unit 2 to generate co-frequency interference. In FIG. 2b, at time 2, the radio frequency unit 1 is in a receiving mode, the radio frequency unit 2 is in a transmitting mode, the radio frequency unit 2 transmits a downlink signal to a UE, and the UE transmits an uplink signal to the radio frequency unit 1, which causes the radio frequency unit 2 to generate co-frequency interference to the radio frequency unit 1.

[0130] The full-duplex communication system provided by the embodiments of the present application has a distributed radio frequency interference cancellation system architecture, and therefore the full-duplex communication system can also be referred to as a distributed full-duplex communication system. The full-duplex communication system provided by the embodiments of the present application can achieve enhanced co-frequency interference suppression of uplink and downlink.

[0131] Based on the distributed full-duplex communication system shown in FIG. 2a and FIG. 2b, the co-frequency interference strength from other transmitters to receivers in the distributed full-duplex communication system is reduced in a cancellation signal mode without affecting the radio frequency power of only transmitting radio frequency units and with low noise floor, thereby suppressing strong self-interference in the distributed full-duplex communication system, solving the problems of noise floor lifting, digital quantization error increasing, even radio frequency link nonlinearity, and saturation of received baseband data caused by only receiving radio frequency units, and enabling normal operation of the distributed full-duplex communication system.

[0132] The full-duplex communication system provided by the embodiments of the present application can solve the interference suppression problem in FIG. 2a and FIG. 2b by using a radio frequency cancellation method in an analog domain.

[0133] Next, a full-duplex communication system provided by an embodiment of the present application is described. As shown in FIG. 3, the full-duplex communication system includes a radio frequency unit, wherein,

[0134] The radio frequency unit is configured to transmit a downlink signal to a terminal device through a transmitting channel.

[0135] The radio frequency unit is configured to receive a downlink co-frequency interference signal and an uplink signal from the terminal device to obtain a receiving signal, wherein the downlink co-frequency interference signal includes an interference signal generated by the radio frequency unit transmitting the downlink signal and an interference signal generated by another radio frequency unit transmitting the downlink signal.

[0136] The radio frequency unit is configured to obtain a cancellation signal that is equal in amplitude and opposite in phase to the downlink co-frequency interference signal, with the downlink signal transmitted through the transmitting channel as a reference signal.

[0137] The radio frequency unit is configured to perform combining processing on the received signal and the cancellation signal to eliminate the interference of the downlink co-frequency interference signal on the uplink signal.

[0138] In the embodiment, the radio frequency unit can be the radio frequency unit 2 in FIG. 2a or the radio frequency unit 1 in FIG. 2b. For example, the radio frequency unit can be a pico remote radio unit (pRRU). However, the radio frequency unit in the embodiment is not limited to the pRRU, and can also be a radio frequency unit in other network modes. When the radio frequency unit is in the transmitting mode, the radio frequency unit can send a downlink signal to a terminal device through a transmitting channel. When the radio frequency unit is in the receiving mode, the radio frequency unit can receive an uplink signal sent by the terminal device. The radio frequency unit can also receive a downlink co-frequency interference signal. Specifically, the downlink co-frequency interference signal is an interference signal entering a receiving channel of the radio frequency unit when the radio frequency unit is in the receiving mode. The downlink co-frequency interference signal includes multiple interference signals, such as an interference signal generated by the radio frequency unit itself and an interference signal generated by another radio frequency unit. For example, the radio frequency unit can generate an interference signal when sending a downlink signal. In addition, another radio frequency unit (for example, the radio frequency unit 1 in FIG. 2a or the radio frequency unit 2 in FIG. 2b) can also generate an interference signal when sending a downlink signal.

[0139] In the embodiment, after the radio frequency unit receives the downlink co-frequency interference signal and the uplink signal, the downlink co-frequency interference signal can interfere with the received uplink signal. The radio frequency unit also has a cancellation function. The radio frequency unit takes the downlink signal sent through the transmitting channel as a reference signal, obtains a cancellation signal that is equal in amplitude and opposite in phase to the downlink co-frequency interference signal, and generates the cancellation signal that is equal in amplitude and opposite in phase to the downlink co-frequency interference signal. The radio frequency unit can obtain the downlink signal sent through the transmitting channel after performing low noise amplification (LNA) on the downlink signal. Then, the radio frequency unit performs combining processing on the received signal and the cancellation signal to eliminate the interference of the downlink co-frequency interference signal on the uplink signal. In the embodiment, the radio frequency unit can be used to cancel the radio frequency interference from other radio frequency units, reduce the co-frequency interference strength from other radio frequency units in the full-duplex communication system, suppress strong self-interference in the full-duplex communication system, and solve the problems of noise lifting, digital quantization error increasing, even radio frequency link nonlinearity, and saturation of received baseband data.

[0140] In some embodiments of the present application, the radio frequency unit is specifically configured to acquire a receiving power of a received signal; taking a downlink signal sent through a transmission channel as a reference signal, adjusting the reference signal according to the receiving power; when the receiving power is less than a power threshold, acquiring a cancellation weight value according to the adjusted reference signal; and acquiring a cancellation signal according to the cancellation weight value.

[0141] In the above process, the radio frequency unit detects the receiving power of the current radio frequency channel, then switches the cancellation weight value, detects the receiving power of the current radio frequency channel again, takes the downlink co-channel interference signal as the reference signal, adjusts the reference signal according to the detected receiving power, and repeats the above process to find a cancellation weight value that can make the receiving power of the current radio frequency channel less than the power threshold, acquires the current cancellation weight value according to the adjusted reference signal, and finally generates the cancellation signal according to the acquired cancellation weight value. In the embodiments of the present application, the radio frequency unit has the function of generating the cancellation signal, so that the cancellation signal can be used to suppress strong self-interference in the full-duplex communication system.

[0142] For example, the receiving power being less than the power threshold can specifically mean that the receiving power of the radio frequency channel reaches a minimum value, and the cancellation weight value corresponding to the minimum receiving power can be considered as an optimal weight value. At this time, the generated cancellation signal is closest to the state of being equal in amplitude and opposite in phase to the downlink co-channel interference signal, so that the phase and amplitude of the reference signal are adjusted to be equal in amplitude and opposite in phase to the downlink co-channel interference signal through the above calculation.

[0143] In some embodiments of the present application, as shown in FIG. 4, the full-duplex communication system further includes a baseband processing unit. As shown in FIG. 5, the radio frequency unit includes a radio frequency switch and a radio frequency transmission link.

[0144] The baseband processing unit is configured to generate a downlink baseband signal, and the downlink baseband signal is input into the radio frequency unit through a transmission channel.

[0145] The radio frequency switch is configured to connect the transmission channel and the radio frequency transmission link.

[0146] The radio frequency transmission link is configured to convert the downlink baseband signal into a downlink signal and send the downlink signal.

[0147] The baseband processing unit can be a building baseband unit (BBU). The baseband processing unit is not limited to the BBU, but can also be a baseband processing unit of other network standards. The baseband processing unit can generate a downlink baseband signal. The downlink baseband signal generated by the baseband processing unit can enter a transmission channel of the radio frequency unit. The radio frequency unit is in a transmission-only mode. The radio frequency switch can connect the transmission channel and the radio frequency transmission link. Thus, the radio frequency transmission link can convert the downlink baseband signal into a downlink signal and transmit the downlink signal. In the present embodiment, the radio frequency unit can be provided with a radio frequency switch. The radio frequency switch can connect the transmission channel and the radio frequency transmission link. The radio frequency transmission link can transmit the downlink signal. Thus, the radio frequency unit can transmit the downlink signal in the transmission-only mode.

[0148] In some embodiments of the present application, as shown in FIG. 6, the radio frequency unit further includes a radio frequency receiving link and a cancellation module.

[0149] The radio frequency switch is used to connect the transmission channel and the cancellation module.

[0150] The radio frequency receiving link is used to receive an uplink signal from the terminal device and receive a downlink co-frequency interference signal.

[0151] When the radio frequency unit is in the receiving-only mode, the radio frequency unit includes a radio frequency receiving link and a cancellation module. The radio frequency receiving link can receive an uplink signal from the terminal device. For example, as shown in FIG. 2b, the radio frequency unit 1 is in the receiving-only mode. The terminal device can transmit an uplink signal. The radio frequency unit 1 includes a radio frequency receiving link. The radio frequency receiving link can receive the uplink signal. The radio frequency switch in the radio frequency unit can connect the transmission channel and the cancellation module. The radio frequency receiving link can receive an uplink signal from the terminal device and receive a downlink co-frequency interference signal. The downlink co-frequency interference signal is described in detail in the foregoing embodiments, and will not be described here. In the present embodiment, the radio frequency unit can be provided with a radio frequency switch. The radio frequency receiving link can receive a downlink co-frequency interference signal from the transmission-only device. Thus, the radio frequency unit can receive a downlink co-frequency interference signal in the receiving-only mode.

[0152] In some embodiments of the present application, the cancellation module is used to obtain a cancellation signal that is equal in amplitude and opposite in phase to the downlink co-frequency interference signal, with the downlink signal transmitted through the transmission channel as a reference signal.

[0153] Specifically, the cancellation module can be arranged in the radio frequency unit, and the cancellation module is connected with the radio frequency switch. When the radio frequency unit is in the receiving-only mode, the cancellation module is connected with the transmitting channel under the switching of the radio frequency switch. For example, the cancellation module is connected with the LNA in the transmitting channel. The cancellation module has the function of generating the cancellation signal. The cancellation module can receive the reference signal of the same frequency as the interference. For example, the cancellation module takes the downlink signal sent through the transmitting channel as the reference signal, and obtains the cancellation signal of the same amplitude and opposite phase as the downlink co-frequency interference signal. In the embodiment of the application, the cancellation module can be arranged in the radio frequency unit to generate the cancellation signal.

[0154] In some embodiments of the application, as shown in FIG. 6, the radio frequency unit includes a radio frequency switch, a radio frequency transmitting link, a radio frequency receiving link and a cancellation module.

[0155] The radio frequency switch is used to connect the transmitting channel with the radio frequency transmitting link.

[0156] The radio frequency transmitting link is used to send the downlink signal.

[0157] The radio frequency switch is used to switch from being connected with the radio frequency transmitting link to being connected with the cancellation module.

[0158] The radio frequency receiving link is used to receive the uplink signal from the terminal device and receive the downlink co-frequency interference signal.

[0159] The cancellation module is used to take the downlink signal sent through the transmitting channel as the reference signal, and obtain the cancellation signal of the same amplitude and opposite phase as the downlink co-frequency interference signal.

[0160] In the radio frequency unit, the radio frequency switch has the switching function, and the radio frequency switch switches from being connected with the radio frequency transmitting link to being connected with the cancellation module. Therefore, the cancellation module can receive the reference signal of the radio frequency transmitting link. The cancellation module has the function of generating the cancellation signal. The cancellation module takes the downlink signal sent through the transmitting channel as the reference signal, and obtains the cancellation signal of the same amplitude and opposite phase as the downlink co-frequency interference signal. In the embodiment of the application, the cancellation module can be arranged in the radio frequency unit to generate the cancellation signal.

[0161] In the current communication system, the reference signal is usually obtained by coupling the signal of the transmitting channel with a coupler, which reduces the radio frequency power of the transmitting antenna port, but causes power backoff of the downlink. In addition, the reference signal obtained directly from the transmitting channel by coupling has the problem of difficult noise floor control, which causes the noise floor of the received signal after the cancellation combiner to be lifted. To solve this problem, in some embodiments of the present application, please refer to FIG. 7, the radio frequency unit further comprises: a system on chip (SOC), a radio on chip (ROC), a low noise amplifier (LNA); the radio frequency transmitting link comprises: a power amplifier (PA) and an antenna;

[0162] The system on chip is connected to the radio on chip, the radio on chip is connected to the low noise amplifier, the low noise amplifier is connected to the radio frequency switch, the radio frequency switch is connected to the power amplifier, and the power amplifier is connected to the antenna;

[0163] The system on chip (SOC) is configured to modulate and process the downlink baseband signal to obtain a downlink intermediate frequency signal;

[0164] The radio on chip (ROC) is configured to up-convert the downlink intermediate frequency signal to obtain a downlink radio frequency signal, and send the downlink radio frequency signal to the low noise amplifier;

[0165] The low noise amplifier is configured to amplify the downlink radio frequency signal with low noise to obtain a downlink radio frequency signal amplified with low noise;

[0166] The radio frequency switch is configured to turn on the low noise amplifier and the power amplifier;

[0167] The power amplifier is configured to amplify the downlink radio frequency signal amplified with low noise to obtain a downlink signal;

[0168] The antenna is configured to send the downlink signal to the terminal device through the transmitting channel.

[0169] The system on chip is connected with a baseband processing unit, the system on chip is connected with a system on radio frequency chip, the system on radio frequency chip is connected with a low noise amplifier, the low noise amplifier is connected with a radio frequency switch, the radio frequency switch is connected with a power amplifier, and the power amplifier is connected with an antenna. The system on chip modulates a downlink baseband signal to generate a downlink intermediate frequency signal, the system on radio frequency chip up-converts the downlink intermediate frequency signal to generate a downlink radio frequency signal, the low noise amplifier low-noise-amplifies the downlink radio frequency signal to generate a low-noise-amplified downlink radio frequency signal, the radio frequency unit is in a transmitting mode only, the radio frequency switch turns on the low noise amplifier and the power amplifier, so that the low-noise-amplified downlink radio frequency signal output by the low noise amplifier can be input into the power amplifier, the power amplifier power-amplifies the low-noise-amplified downlink radio frequency signal to obtain a downlink signal, and the downlink signal can be transmitted through the antenna. In the embodiment of the application, the radio frequency switch is located after the low noise amplifier and before the power amplifier, so the embodiment of the application does not affect the radio frequency power of the radio frequency unit and can reduce the influence of the cancellation on the noise floor of the received signal.

[0170] In the current communication system, part of the power of the transmitting channel of the transmitter is coupled to the reference signal, so the power of the transmitting channel of the transmitter is reduced. In the embodiment of the application, the radio frequency power of the transmitting unit is not affected, and the analysis process is as follows. Since the loss caused by the introduction of the radio frequency switch before the PA does not affect the radio frequency power after the PA, the signal before the PA is in milliwatts, which is called a small power signal, and the signal after the PA is in watts, which is called a large power signal. The amplification multiple of the PA is large, but it does not amplify all the signals to the maximum power, but is limited by the rated power. Therefore, the small power signal is amplified to a large power signal at the maximum rated power. Therefore, the loss caused by the insertion of the radio frequency switch before the PA does not affect the radio frequency power after the PA, that is, the radio frequency power of the transmitter.

[0171] In the current communication system, the signal of the transmitting channel has passed through the PA, and the noise floor is greatly increased and difficult to control due to the nonlinearity of the PA. In the embodiment of the application, the influence of the cancellation on the noise floor of the received signal can be reduced, and the analysis process is as follows. In the embodiment of the application, the reference signal of the cancellation module is generated by the low noise amplifier. The noise floor of the reference signal itself is small, so the influence of the noise floor of the signal after the cancellation combiner is also small, and the influence of the noise floor can be further reduced by the LNA with lower noise.

[0172] In some embodiments of the application, referring to FIG. 6 or FIG. 8, the radio frequency unit further comprises a combiner.

[0173] The combiner is configured to combine the received signal and the cancellation signal.

[0174] The radio frequency unit can further include a combiner. When the radio frequency unit is in the receiving-only mode, the radio frequency switch can be connected to the cancellation module, the cancellation module can generate a cancellation signal, and the cancellation module can input the cancellation signal into the combiner. The combiner can perform combiner processing on the received signal and the cancellation signal. In the embodiment of the present application, the radio frequency unit includes the combiner. The combiner can perform combiner processing on the received signal and the cancellation signal. Thus, the strong self-interference in the full-duplex communication system can be suppressed.

[0175] In some embodiments of the present application, as shown in FIG. 8, the combiner is connected to the on-chip radio frequency chip.

[0176] The combiner is configured to send the uplink signal to the on-chip radio frequency chip.

[0177] The on-chip radio frequency chip is configured to perform down-conversion processing on the uplink signal to obtain an uplink intermediate frequency signal.

[0178] The on-chip system is configured to perform demodulation processing on the uplink intermediate frequency signal to obtain an uplink baseband signal, and send the uplink baseband signal to the baseband processing unit.

[0179] When the radio frequency unit is in the receiving-only mode, the combiner can perform combiner processing on the received signal and the cancellation signal. Thus, the downlink co-channel interference signal in the received signal can be eliminated, and the uplink signal can be retained. The combiner is connected to the on-chip radio frequency chip. The combiner can send the uplink signal to the on-chip radio frequency chip. The on-chip radio frequency chip can perform down-conversion processing on the uplink signal to obtain an uplink intermediate frequency signal. The on-chip system can perform demodulation processing on the uplink intermediate frequency signal to obtain an uplink baseband signal. The on-chip system can send the uplink baseband signal to the baseband processing unit. Thus, the baseband processing unit can receive the uplink baseband signal. Thus, the radio frequency unit can complete the transmission of the uplink signal to the baseband processing unit.

[0180] In order to better understand and implement the above-mentioned scheme of the embodiments of the present application, the corresponding application scenarios are taken as examples for specific description.

[0181] Please refer to Fig. 9, which shows a radio frequency cancellation hardware architecture of a full-duplex communication system in an embodiment of the present application. The full-duplex communication system includes a baseband unit and a radio frequency unit. The radio frequency unit can be divided into a receive-only radio frequency unit and a transmit-only radio frequency unit according to the working mode. The receive-only radio frequency unit refers to a radio frequency unit in a receive-only mode, and the transmit-only radio frequency unit refers to a radio frequency unit in a transmit-only mode. For example, the radio frequency unit includes a ROC, a radio frequency transmit link Tx, a radio frequency switch, a cancellation module, a combiner, a radio frequency receive link Rx, a circulator, and an antenna. In the receive-only radio frequency unit, the ROC is connected to an LNA, the LNA is connected to the radio frequency switch, the radio frequency switch is connected to the cancellation module, or the radio frequency switch is connected to a PA, the cancellation module is connected to the combiner, the antenna is connected to the circulator, the circulator is connected to the Rx, and the Rx is connected to the combiner. In the transmit-only radio frequency unit, the baseband unit is connected to the ROC, the ROC is connected to the LNA, the LNA is connected to the radio frequency switch, the radio frequency switch is connected to the PA, the PA is connected to the circulator, and the circulator is connected to the antenna.

[0182] The system on chip can be a microprocessor, which can control the digital signal of the radio frequency unit. The radio frequency chip on chip can be an integrated circuit product, which can control the radio frequency signal of the radio frequency unit. The combiner is used to combine multiple radio frequency signals into one signal. The circulator is used to realize one-way transmission of the radio frequency signal in a specific direction and isolation in other directions.

[0183] Specifically, a radio frequency switch is arranged after a low noise amplifier (LNA) in a transmit channel of the radio frequency unit. The radio frequency switch in the embodiment of the present application can be implemented by a micro electro mechanical system (MEMS) switch, an electromechanical switch, or a semiconductor switch. The radio frequency switch is arranged after the LNA in the transmit channel of the radio frequency unit, and the radio frequency switch can switch the transmit state and the receive state of the radio frequency unit.

[0184] A cancellation module is inserted between the transmit channel and the receive channel. When the radio frequency unit is in a receive-only (Rx-only) state, the radio frequency switch is connected to the inlet of the cancellation module, and the baseband signal of the receive unit is multiplexed with the baseband signal of the transmit unit, so as to ensure that the reference signal of the cancellation module and the signal radiated by the transmitter are completely the same. Finally, the cancellation signal with the same amplitude and opposite phase as the interference is generated through the calculation of the cancellation module, the cancellation signal and the receive signal are combined, the radio frequency cancellation of the same frequency interference is completed, the interference after the combiner is reduced, and the original uplink data signal remains unchanged. In addition, when the radio frequency unit is in a transmit-only (Tx-only) state, the radio frequency switch is connected to the power amplifier, so that the radio frequency signal is amplified by the power amplifier and then output to the port of the antenna, and finally radiated to the external space through the antenna.

[0185] The application scenarios of the embodiments of the present application include but are not limited to the above-mentioned distributed full-duplex communication system with switchable transceiving. As shown in FIG. 10, the embodiments of the present application are also applicable to the scenario with separated transmitters and receivers. In this scenario, an LNA and a cancellation module are added in the receiver. The baseband data of the radio frequency reference signal required by the receiver is obtained by copying the baseband data of the transmitter, so the baseband signals of the receiver and the transmitter are multiplexed. The radio frequency signal is obtained by up-conversion of the baseband signal. The reference signal of the cancellation module is ensured to be completely the same as the signal radiated by the transmitter. Finally, the cancellation signal with the same amplitude and opposite phase as the interference is generated by the calculation of the cancellation module, and the reception is completed after the combination of the signals in the receiver.

[0186] Next, the functions and connection modes of the baseband processing unit (BBU) and the radio frequency remote unit (pRRU) in the full-duplex communication system in the embodiments of the present application are described.

[0187] An LNA is added after the radio frequency switch in the transmission channel of the pRRU. The switch input port of the radio frequency switch is connected to the output port of the LNA, and the switch output port of the radio frequency switch is connected to the input port of the PA in the transmission channel and the output port of the cancellation module, respectively. A combiner is added in the reception channel of the pRRU. The input ports of the combiner are connected to the output ports of the cancellation module and the front end of the reception channel, respectively, and the output port of the combiner is connected to the rear end of the reception channel. The cancellation module is set in the reception channel and the transmission channel of the pRRU.

[0188] The BBU can enable the radio frequency unit in the reception state to output the same data signal as the radio frequency unit in the transmission state.

[0189] The pRRU can control the state of the radio frequency switch added after the LNA and control the cancellation module to calculate the cancellation weight with the same amplitude and opposite phase as the co-frequency interference signal. The cancellation weight refers to the state value of each element in the cancellation module, such as the attenuation value of the attenuator and the phase shift value of the phase shifter.

[0190] As shown in FIG. 11, the function of the cancellation module in the embodiments of the present application is to adjust the phase and amplitude of the reference signal. The working process of the cancellation module mainly includes the following steps:

[0191] S01, initialization of the cancellation module.

[0192] S02, monitoring of the reception power.

[0193] Specifically, the reference signal passing through the cancellation module is input into the reception channel after being combined by the combiner, and the radio frequency unit monitors the reception power in the reception channel.

[0194] S03, monitoring whether the received power is minimum, when the received power is minimum, performing step S04, when the received power is not minimum, switching the cancellation weight value, and then re-performing step S02 and subsequent steps.

[0195] According to the size of the received power, the cancellation module adjusts the phase and amplitude of the reference signal, when the received power is minimum, the calculation of the cancellation weight value is completed, at this time, the cancellation signal and the same frequency downlink interference signal of the transmission head are equal amplitude and opposite phase, and it is considered that the optimal cancellation weight value has been found.

[0196] Next, the product form of the radio frequency unit in the embodiment of the application is described, for example, the radio frequency unit can be a new generation of Internet of Things base station, and the new generation of Internet of Things base station includes: radio frequency hardware, multimode-multiband architecture radio platform (MARP) software and baseband software. For another example, the radio frequency unit can be a full-duplex indoor distributed system (LampSite) including radio frequency (RF) and base station (BS), for example, the radio frequency unit can include: micro radio frequency remote unit (pRRU) hardware, MARP software and baseband software.

[0197] Please refer to FIG. 12, taking the full-duplex small station system architecture of the downlink and uplink as an example, the distributed deployment of the transceiving integrated pRRU is networked, each pRRU includes SOC, ROC, radio frequency transmission link (RF TX), radio frequency receiving link (RF RX), cancellation module and antenna, and the downlink signal is a narrowband signal. The radio frequency transmission link can specifically include: LNA, radio frequency switch and PA.

[0198] When the base station is working, in the pRRU in the downlink transmission state, the service signal of the digital baseband is transmitted from the optical fiber through the common public radio interface (CPRI), the service signal is first transmitted to the SOC in the pRRU, the service signal is up-converted to the ROC, and is further transmitted to the antenna through the radio frequency transmission link, and the downlink signal is radiated.

[0199] At the same time, the uplink signal transmitted by the UE is received by the pRRU in the only uplink receiving state, the uplink signal passes through the antenna, the radio frequency receiving link to the ROC, is further down-converted to the SOC, and finally is processed by the SOC and input into the CPRI to reach the baseband unit.

[0200] Meanwhile, in addition to the uplink signal transmitted by the UE being received by the pRRU in the Rx-only state, the downlink signal from the adjacent pRRU in the Tx-only state is also received by the pRRU in the receiving state, and because the downlink power of the base station is generally much greater than the uplink power of the UE, the interference is much greater than the signal strength. This causes the problem of the receiver being blocked by the excessively large received power, the problem of the digital signal being excessively large, the problem of quantization error being generated at the CPRI, and the problem of the digital domain being saturated at the baseband. In the embodiments of the present application, the interference cancellation architecture shown in FIG. 12 can be used to achieve the effect of enhancing the suppression of the co-frequency interference. The baseband generates a downlink digital signal, which passes through the SOC, the ROC, the LNA, the PA, the circulator, and the antenna in the pRRU in the Tx-only state, and radiates a downlink radio frequency signal. At this time, the uplink UE signal and the downlink co-frequency interference signal enter the receiving channel of the pRRU in the Rx-only state at the same time. In order to cancel the downlink co-frequency interference signal, the baseband unit simultaneously transmits the downlink digital signal to the SOC of the pRRU in the Rx-only state, and the signal passes through the ROC and the LNA to generate a reference signal, thereby ensuring that the reference signal and the downlink co-frequency interference signal have the same data. The reference signal passes through the cancellation module to generate a cancellation signal, the cancellation signal and the signal in the receiving channel are combined, the interference signal is cancelled by the radio frequency cancellation, and the uplink signal is retained. The uplink signal can be input to the ROC, the SOC, and the baseband unit.

[0201] Referring to FIG. 13, it is a structure of the cancellation module, but it should be noted that the implementation method is not limited to that shown in FIG. 13, and a network capable of changing the phase and amplitude of the signal can also be used to implement the cancellation module. In the module shown in FIG. 13, the entrance is connected to the phase inversion power divider (i.e., the balun), which divides the reference signal into two signals with a phase difference of 180°. Then, the two signals are connected to two orthogonal power dividers (i.e., 90° bridge 1 and 90° bridge 2), thereby obtaining 0°, 90° orthogonal signals and 180°, 270° orthogonal signals in one path. Then, the two orthogonal signals are selected by the two-way two-way radio frequency switch, input to the two independent controllable digital attenuators 1 and 2, and finally combined by the combiner to obtain the cancellation signal with controllable phase and amplitude.

[0202] As shown in FIG. 14, it is another structure of the cancellation module. The cancellation module can include a digital attenuator and a digital phase shifter. The reference signal enters the digital attenuator for amplitude control, and then passes through the digital phase shifter for phase shifting. Finally, the cancellation signal with controllable phase and amplitude can be obtained.

[0203] As can be seen from the foregoing examples, the radio frequency interference cancellation architecture of the distributed full-duplex communication system significantly reduces the interference of the Tx-only state radio frequency unit on the Rx-only state radio frequency unit in the system. For example, in the 18-meter networking scheme of the pRRU, the Tx-only state pRRU transmits a narrowband signal with a transmission power of 38 dBm, and the power after the LNA in the receiving channel of the adjacent Rx-only state pRRU is about 0 dBm, which has caused a receiving blocking problem. The radio frequency cancellation architecture in the embodiment of the present application achieves an interference suppression benefit of about 40 dB. The interference suppression benefit is defined as the interference signal strength at the ROC is reduced by 40 dB after interference cancellation compared with before interference cancellation. Thus, the inter-pRRU co-frequency interference of the distributed full-duplex communication system is greatly reduced, and the normal operation of the distributed full-duplex communication system is ensured.

[0204] It can be understood that the interference suppression capability is related to the algorithm of the cancellation module and the fine degree of amplitude and phase modulation of the cancellation module. The more accurate the cancellation weight determined by the algorithm of the interference suppression capability and the cancellation module is, the higher the fine degree of amplitude and phase modulation of the cancellation module is, and the stronger the interference suppression capability is. The foregoing 40 dB interference capability is achieved on the basis of the hardware and algorithm of the embodiment. For example, the algorithm uses a gradient descent algorithm to find the optimal cancellation weight, and the cancellation module can be in the manner of FIG. 13 or 14, for example, the granularity of the digital attenuator is 0.25 dB.

[0205] Unlike the prior art that uses a coupler to obtain a reference signal, the embodiment of the present application can be applied to a distributed full-duplex communication system with distributed receiving channels and transmitting channels, and effectively reduces the co-frequency downlink self-interference in the distributed full-duplex communication system. The cancellation architecture used in the embodiment of the present application uses a radio frequency switch to multiplex a baseband and part of the transmitting channels, and can obtain a low-noise reference signal in the Rx-only unit far from the Tx-only unit. In addition, when the radio frequency unit is switched to a downlink transmission mode, the radio frequency switch is used to introduce the signal into the PA in the later stage, and the power finally reaching the antenna port will not be affected by the cancellation.

[0206] It should be noted that the typical distance of the distributed configuration of the radio frequency unit in the embodiment of the present application is 18 m, but the embodiment of the present application is not limited to the typical distance, and can be a distance of 10 m to 100 m.

[0207] It should be noted that the transceiver switching mode of the above technical solution is not limited to a radio frequency switch, and can also be implemented by a semiconductor device circuit. For example, the circuit function of the semiconductor device is to electrically control the turn-off and turn-on of the radio frequency channel, which can be composed of a field effect transistor and a resistor.

[0208] It should be noted that, for the foregoing embodiments, in order to simply describe, they are all expressed as a series of module combinations, but those skilled in the art should know that the application is not limited by the described modules, because according to the application, certain modules can be implemented by other modules. Secondly, those skilled in the art should know that the embodiments described in the specification are all preferred embodiments, and the modules involved are not necessarily necessary for the application.

[0209] In order to better implement the above scheme of the embodiments of the application, the following provides a method corresponding to the above module.

[0210] Please refer to FIG. 15, the embodiments of the application provide a full-duplex communication method, comprising:

[0211] 1501, sending a downlink signal to a terminal device through a transmission channel;

[0212] 1502, receiving a downlink co-frequency interference signal corresponding to the downlink signal and an uplink signal from the terminal device to obtain a received signal;

[0213] 1503, taking the downlink signal sent through the transmission channel as a reference signal, obtaining a cancellation signal which is equal amplitude and opposite phase with the downlink co-frequency interference signal;

[0214] 1504, combining the received signal and the cancellation signal to eliminate the interference of the downlink co-frequency interference signal on the uplink signal.

[0215] In some embodiments of the application, taking the downlink signal sent through the transmission channel as the reference signal, obtaining the cancellation signal which is equal amplitude and opposite phase with the downlink co-frequency interference signal, comprises:

[0216] obtaining the received power of the received signal;

[0217] taking the downlink signal sent through the transmission channel as the reference signal, adjusting the reference signal according to the received power;

[0218] when the received power is less than a power threshold, obtaining a cancellation weight value according to the adjusted reference signal;

[0219] obtaining the cancellation signal according to the cancellation weight value.

[0220] In some embodiments of the application, the full-duplex communication system further comprises a baseband processing unit, and the radio frequency unit comprises a radio frequency switch and a radio frequency transmission link;

[0221] The method further comprises generating a downlink baseband signal by the baseband processing unit, and inputting the downlink baseband signal into the radio frequency unit through the transmission channel;

[0222] ​​​​​​​​​​​​​​​​​​​​​​​​​​​The transmitting the downlink signal to the terminal device through the transmitting channel of the radio frequency unit comprises:

[0223] When the radio frequency switch connects the transmitting channel and the radio frequency transmitting link, the downlink baseband signal is converted into the downlink signal through the radio frequency transmitting link, and the downlink signal is transmitted.

[0224] In some embodiments of the present application, the radio frequency unit further comprises a radio frequency receiving link and a cancellation module;

[0225] The receiving the downlink co-frequency interference signal and the uplink signal from the terminal device comprises:

[0226] When the radio frequency switch connects the receiving channel and the cancellation module, the uplink signal from the terminal device is received through the radio frequency receiving link, and the downlink co-frequency interference signal is received.

[0227] In some embodiments of the present application, the radio frequency unit further comprises a cancellation module;

[0228] The cancellation signal with the same amplitude and opposite phase as the downlink co-frequency interference signal is obtained by taking the downlink signal transmitted through the transmitting channel as a reference signal, comprising:

[0229] The cancellation signal with the same amplitude and opposite phase as the downlink co-frequency interference signal is obtained by taking the downlink signal transmitted through the transmitting channel as a reference signal through the cancellation module.

[0230] In some embodiments of the present application, the radio frequency unit comprises a radio frequency switch, a radio frequency transmitting link, a radio frequency receiving link and a cancellation module;

[0231] The transmitting the downlink signal to the terminal device through the transmitting channel of the radio frequency unit comprises: when the radio frequency switch connects the transmitting channel and the radio frequency transmitting link, the downlink signal is transmitted through the radio frequency transmitting link;

[0232] The receiving the downlink co-frequency interference signal and the uplink signal from the terminal device comprises:

[0233] When the radio frequency switch is switched from connecting the radio frequency transmitting link to connecting the cancellation module, the uplink signal from the terminal device is received through the radio frequency receiving link, and the downlink co-frequency interference signal is received.

[0234] The cancellation signal with the same amplitude and opposite phase as the downlink co-frequency interference signal is obtained by taking the downlink signal transmitted through the transmitting channel as a reference signal, comprising: the cancellation signal with the same amplitude and opposite phase as the downlink co-frequency interference signal is obtained by taking the downlink signal transmitted through the transmitting channel as a reference signal through the cancellation module.

[0235] In some embodiments of the application, the radio frequency unit further comprises: a system on chip (SOC), a radio on chip (ROC), and a low noise amplifier (LNA); the radio frequency transmitting link comprises: a power amplifier and an antenna;

[0236] The system on chip is connected to the radio on chip, the radio on chip is connected to the low noise amplifier, the low noise amplifier is connected to the radio frequency switch, the radio frequency switch is connected to the power amplifier, and the power amplifier is connected to the antenna;

[0237] The radio frequency switch is connected to the radio frequency transmitting link through the receiving channel, the downlink baseband signal is converted into a downlink signal through the radio frequency transmitting link, and the downlink signal is transmitted, comprising:

[0238] The downlink baseband signal is modulated by the system on chip (SOC) to obtain a downlink intermediate frequency signal;

[0239] The downlink intermediate frequency signal is up-converted by the radio on chip (ROC) to obtain a downlink radio frequency signal, and the downlink radio frequency signal is transmitted to the low noise amplifier;

[0240] The downlink radio frequency signal is amplified by the low noise amplifier to obtain a low-noise-amplified downlink radio frequency signal;

[0241] When the radio frequency switch is connected to the low noise amplifier and the power amplifier, the low-noise-amplified downlink radio frequency signal is amplified by the power amplifier to obtain a downlink signal;

[0242] The downlink signal is transmitted to the terminal device through the transmitting channel by the antenna.

[0243] In some embodiments of the application, the radio frequency unit further comprises: a combiner;

[0244] The received signal and the cancellation signal are combined, comprising:

[0245] The received signal and the cancellation signal are combined by the combiner.

[0246] In some embodiments of the application, the combiner is connected to the radio on chip;

[0247] The method further comprises:

[0248] The uplink signal is transmitted to the radio on chip (ROC) by the combiner;

[0249] The uplink signal is down-converted by the radio on chip (ROC) to obtain an uplink intermediate frequency signal;

[0250] The uplink intermediate frequency signal is demodulated by the system on chip (SOC) to obtain an uplink baseband signal;

[0251] The uplink baseband signal is sent to a baseband processing unit through a system on chip (SOC).

[0252] It should be noted that the information interaction, execution process and the like between the various steps of the above method and the modules / units of the foregoing device are based on the same concept, and the technical effects brought by the same are the same as those of the device embodiments of the present application. For specific content, refer to the description in the foregoing device embodiments of the present application, which will not be repeated here.

[0253] The embodiments of the present application also provide a computer storage medium, wherein the computer storage medium stores a program, and the program executes part or all of the steps recorded in the foregoing method embodiments.

[0254] Next, another full-duplex communication system provided by the embodiments of the present application is introduced. Referring to FIG. 16, the full-duplex communication system 1600 includes:

[0255] The receiver 1601, the transmitter 1602, the processor 1603 and the memory 1604 (wherein the number of the processor 1603 in the full-duplex communication system 1600 can be one or more, and one processor is taken as an example in FIG. 16). In some embodiments of the present application, the receiver 1601, the transmitter 1602, the processor 1603 and the memory 1604 can be connected through a bus or other means, wherein the connection through the bus is taken as an example in FIG. 16.

[0256] The memory 1604 can include read-only memory and random access memory, and provide instructions and data for the processor 1603. A part of the memory 1604 can also include a non-volatile random access memory (NVRAM). The memory 1604 stores an operating system and operation instructions, executable modules or data structures, or a subset thereof, or an extended set thereof, wherein the operation instructions can include various operation instructions for implementing various operations. The operating system can include various system programs for implementing various basic services and processing hardware-based tasks.

[0257] The processor 1603 controls the operation of the full-duplex communication system, and the processor 1603 can also be referred to as a central processing unit (CPU). In specific applications, various components of the full-duplex communication system are coupled together through a bus system, wherein the bus system can include a data bus, a power bus, a control bus and a state signal bus, etc. However, for the purpose of clear illustration, various buses are referred to as a bus system in the figure.

[0258] The method disclosed in the embodiments of the present application can be applied to the processor 1603 or implemented by the processor 1603. The processor 1603 can be an integrated circuit chip having a signal processing capability. In the implementation process, the steps of the above method can be completed by the integrated logic circuits or the software form instructions in the processor 1603. The processor 1603 described above can be a general processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field-programmable gate array (FPGA) or other programmable logic device, a discrete gate or transistor logic device, a discrete hardware component. The disclosed methods, steps and logic block diagrams in the embodiments of the present application can be implemented or executed. The general processor can be a microprocessor or the processor can also be any conventional processor. The steps of the method disclosed in conjunction with the embodiments of the present application can be directly embodied as a hardware code processor to execute, or be executed by a combination of hardware and software modules in the code processor. The software module can be located in a random access memory, a flash memory, a read only memory, a programmable read only memory or an electrically erasable programmable memory, a register, and other mature storage mediums in the art. The storage medium is located in the memory 1604, and the processor 1603 reads the information in the memory 1604, and combines the hardware to complete the steps of the above method.

[0259] The receiver 1601 can be used to receive input digital or character information, and generate signal input related to the settings and function control of the full duplex communication system. The transmitter 1602 can include a display device such as a display screen, and the transmitter 1602 can be used to output digital or character information through an external interface.

[0260] In the embodiments of the present application, the processor 1603 is used to execute the full duplex communication method shown in the foregoing FIG. 15.

[0261] In another possible design, when the full-duplex communication system is a chip of a network device, the chip includes a processing unit, e.g., a processor, and a communication unit, e.g., an input / output interface, a pin, or a circuit, etc. The processing unit can execute computer-executable instructions stored in a storage unit, so as to enable the chip in the terminal to perform the method of any one of the first aspect. Optionally, the storage unit is a storage unit in the chip, e.g., a register, a cache, etc., and the storage unit can also be a storage unit outside the chip in the terminal, e.g., a read-only memory (ROM) or another type of static storage device that can store static information and instructions, a random access memory (RAM), etc.

[0262] The processor mentioned in any one of the above can be a general central processing unit, a microprocessor, an ASIC, or one or more integrated circuits for controlling execution of programs of the above method.

[0263] It should be further noted that the above-described apparatus embodiments are merely illustrative, and the units described as separate components can or can not be physically separated, and the components shown as units can or can not be physical units, i.e., can be located in one place or distributed on multiple network units. Part or all of the modules can be selected according to actual needs to achieve the purpose of the embodiment. In addition, the connection relationship between the modules in the apparatus embodiment provided in the present application indicates that there is a communication connection between them, which can be implemented as one or more communication buses or signal lines.

[0264] From the above description of the embodiments, those skilled in the art can clearly understand that the present application can be implemented by means of software and necessary general hardware, and of course can also be implemented by special hardware including special integrated circuits, special CPUs, special memories, special components, etc. Generally, functions completed by computer programs can be easily implemented by corresponding hardware, and specific hardware structures for implementing the same function can also be various, such as analog circuits, digital circuits or special circuits, etc. However, for the present application, software program implementation is a better embodiment. Based on this understanding, the technical solutions of the present application can be embodied in the form of a software product, which is stored in a readable storage medium, such as a computer's floppy disk, U disk, mobile hard disk, ROM, RAM, magnetic disk or optical disk, etc., including a plurality of instructions for enabling a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in various embodiments of the present application.

[0265] In the embodiments described above, the entire or part of the embodiments can be implemented by software, hardware, firmware, or any combination thereof. When implemented by software, the entire or part of the embodiments can be implemented in the form of a computer program product.

[0266] The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, the entire or part of the processes or functions described in the embodiments of the present application are generated. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable devices. The computer instructions can be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another computer-readable storage medium, for example, the computer instructions can be transmitted from one website, computer, server or data center to another website, computer, server or data center through wired (such as coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (such as infrared, wireless, microwave, etc.). The computer-readable storage medium can be any available medium that a computer can store or a data storage device such as a server, data center, etc. integrated with one or more available media. The available media can be a magnetic medium (for example, a floppy disk, a hard disk, a magnetic tape), an optical medium (for example, a DVD), or a semiconductor medium (for example, a solid state disk (SSD)), etc.

Claims

1. A full duplex communication system, characterized by The full-duplex communication system comprises a radio frequency unit, wherein, The radio frequency unit is configured to send a downlink signal to a terminal device through a transmitting channel of the radio frequency unit. The radio frequency unit is configured to receive a downlink co-frequency interference signal and an uplink signal from the terminal device to obtain a received signal, wherein the downlink co-frequency interference signal comprises an interference signal generated by the radio frequency unit sending the downlink signal and an interference signal generated by another radio frequency unit sending a downlink signal. The radio frequency unit is configured to take the downlink signal sent through the transmitting channel as a reference signal, and obtain a cancellation signal that is equal in amplitude and opposite in phase to the downlink co-frequency interference signal. The radio frequency unit is configured to perform a combination process on the received signal and the cancellation signal to eliminate the interference of the downlink co-frequency interference signal on the uplink signal.

2. The system of claim 1, wherein, The radio frequency unit is specifically configured to obtain a received power of the received signal, take the downlink signal sent through the transmitting channel as a reference signal, adjust the reference signal according to the received power, obtain a cancellation weight according to the adjusted reference signal when the received power is less than a power threshold, and obtain the cancellation signal according to the cancellation weight.

3. The system of claim 1, wherein, The full-duplex communication system further comprises a baseband processing unit, and the radio frequency unit comprises a radio frequency switch and a radio frequency transmitting link. The baseband processing unit is configured to generate a downlink baseband signal, and the downlink baseband signal is input into the radio frequency unit through the transmitting channel. The radio frequency switch is configured to turn on the transmitting channel and the radio frequency transmitting link. The radio frequency transmitting link is configured to convert the downlink baseband signal into the downlink signal, and send the downlink signal.

4. The system of claim 3, wherein, The radio frequency unit further comprises a radio frequency receiving link and a cancellation module. The radio frequency switch is configured to turn on the transmitting channel and the cancellation module. The radio frequency receiving link is configured to receive the uplink signal from the terminal device and the downlink co-frequency interference signal.

5. The system of claim 4, wherein, The cancellation module is configured to take the downlink signal sent through the transmitting channel as a reference signal, and obtain a cancellation signal that is equal in amplitude and opposite in phase to the downlink co-frequency interference signal.

6. The system of claim 1, wherein, The radio frequency unit comprises a radio frequency switch, a radio frequency transmitting link, a radio frequency receiving link and a cancellation module. The radio frequency switch is configured to turn on the transmitting channel and the radio frequency transmitting link. The radio frequency transmitting link is configured to send the downlink signal. The radio frequency switch is configured to switch from being connected to the radio frequency transmitting link to being connected to the cancellation module. The radio frequency receiving link is configured to receive the uplink signal from the terminal device and the downlink co-frequency interference signal. The cancellation module is configured to take the downlink signal sent through the transmitting channel as a reference signal, and obtain a cancellation signal that is equal in amplitude and opposite in phase to the downlink co-frequency interference signal.

7. The system of any one of claims 3 to 5, wherein, The radio frequency unit further comprises a system on chip (SOC), a radio on chip (ROC) and a low noise amplifier (LNA), and the radio frequency transmitting link comprises a power amplifier and an antenna. The on-chip system is connected with the on-chip radio frequency chip, the on-chip radio frequency chip is connected with the low noise amplifier, the low noise amplifier is connected with the radio frequency switch, the radio frequency switch is connected with the power amplifier, and the power amplifier is connected with the antenna; The on-chip system SOC is used for modulating and processing the downlink baseband signal to obtain a downlink intermediate frequency signal; The on-chip radio frequency chip ROC is used for up-conversion processing of the downlink intermediate frequency signal to obtain a downlink radio frequency signal, and the downlink radio frequency signal is sent to the low noise amplifier; The low noise amplifier is used for low noise amplification of the downlink radio frequency signal to obtain a low noise amplified downlink radio frequency signal; The radio frequency switch is used for turning on the low noise amplifier and the power amplifier; The power amplifier is used for power amplification of the low noise amplified downlink radio frequency signal to obtain the downlink signal; The antenna is used for sending the downlink signal to the terminal device.

8. The system of claim 7, wherein, The radio frequency unit further comprises a combiner; The combiner is used for combiner processing of the received signal and the cancellation signal.

9. The system of claim 8, wherein, The combiner is connected with the on-chip radio frequency chip; The combiner is used for sending the uplink signal to the on-chip radio frequency chip; The on-chip radio frequency chip is used for down-conversion processing of the uplink signal to obtain an uplink intermediate frequency signal; The on-chip system is used for demodulation processing of the uplink intermediate frequency signal to obtain an uplink baseband signal; The uplink baseband signal is sent to the baseband processing unit.

10. A full-duplex communication method, characterized by, The method is applied to a full duplex communication system, and the full duplex communication system comprises a radio frequency unit, and the method comprises: sending a downlink signal to a terminal device through a transmitting channel of the radio frequency unit; receiving a downlink co-frequency interference signal and an uplink signal from the terminal device to obtain a received signal, wherein the downlink co-frequency interference signal comprises an interference signal generated by the radio frequency unit sending the downlink signal and an interference signal generated by another radio frequency unit sending a downlink signal; taking the downlink signal sent through the transmitting channel as a reference signal, and obtaining a cancellation signal which is equal in amplitude and opposite in phase to the downlink co-frequency interference signal; performing combiner processing on the received signal and the cancellation signal to eliminate interference of the downlink co-frequency interference signal on the uplink signal.

11. The method of claim 10, wherein, The method of taking the downlink signal sent through the transmitting channel as a reference signal and obtaining a cancellation signal which is equal in amplitude and opposite in phase to the downlink co-frequency interference signal comprises: obtaining a received power of the received signal; taking the downlink signal sent through the transmitting channel as a reference signal, and adjusting the reference signal according to the received power; when the received power is less than a power threshold, obtaining a cancellation weight value according to the adjusted reference signal; obtaining the cancellation signal according to the cancellation weight value.

12. The method of claim 10, wherein, The full duplex communication system further comprises a baseband processing unit, and the radio frequency unit comprises a radio frequency switch and a radio frequency transmitting link; The method further comprises: generating, by the baseband processing unit, a downlink baseband signal, the downlink baseband signal being input to the radio frequency unit through the transmission channel; The method further comprises: When the radio frequency switch is turned on the transmission channel and the radio frequency transmission link, the downlink baseband signal is converted into the downlink signal through the radio frequency transmission link, and the downlink signal is transmitted.

13. The method of claim 12, wherein, The radio frequency unit further comprises: a radio frequency receiving link and a cancellation module; The method further comprises: When the radio frequency switch is turned on the transmission channel and the radio frequency transmission link, the downlink baseband signal is converted into the downlink signal through the radio frequency transmission link, and the downlink signal is transmitted.

14. The method of claim 13, wherein, The radio frequency unit further comprises: a radio frequency receiving link and a cancellation module; The method further comprises:

15. The method of claim 10, wherein, When the radio frequency switch is turned on the transmission channel and the radio frequency transmission link, the downlink baseband signal is converted into the downlink signal through the radio frequency transmission link, and the downlink signal is transmitted. The radio frequency unit further comprises: a radio frequency receiving link and a cancellation module; The method further comprises: When the radio frequency switch is turned on the transmission channel and the radio frequency transmission link, the downlink baseband signal is converted into the downlink signal through the radio frequency transmission link, and the downlink signal is transmitted. The radio frequency unit further comprises: a system on chip (SOC), a radio on chip (ROC), and a low noise amplifier (LNA); 16. The method according to any one of claims 12 to 14, characterized in that, The SOC is connected to the ROC, the ROC is connected to the LNA, the LNA is connected to the radio frequency switch, the radio frequency switch is connected to the power amplifier, and the power amplifier is connected to the antenna; The method further comprises: The downlink baseband signal is modulated by the SOC to obtain a downlink intermediate frequency signal; The downlink intermediate frequency signal is up-converted by the ROC to obtain a downlink radio frequency signal, and the downlink radio frequency signal is transmitted to the LNA; ​ amplify the downlink radio frequency signal to obtain a low-noise amplified downlink radio frequency signal; amplify the low-noise amplified downlink radio frequency signal to obtain the downlink signal; transmit the downlink signal to the terminal device through the antenna.

17. The method of claim 16, wherein, The radio frequency unit further comprises a combiner. The combining the received signal and the cancellation signal comprises: combining the received signal and the cancellation signal through the combiner.

18. The method of claim 17, wherein, The combiner is connected to the on-chip radio frequency chip. The method further comprises: transmitting the uplink signal to the on-chip radio frequency chip through the combiner; down-converting the uplink signal through the on-chip radio frequency chip to obtain an uplink intermediate frequency signal; demodulating the uplink intermediate frequency signal through the on-chip system to obtain an uplink baseband signal; transmitting the uplink baseband signal to the baseband processing unit through the on-chip system. 19.A communication apparatus comprising a processor and a memory, the memory and the processor coupled, the processor configured to perform the method of any one of claims 10 to 18. 20.A computer readable storage medium comprising instructions which, when executed on a computer, cause the computer to perform the method of any one of claims 10 to 18. 21.A computer program product comprising instructions which, when executed on a computer, cause the computer to perform the method of any one of claims 10 to 18.

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