Full-duplex communication apparatus and method

Abstract

A full-duplex communication apparatus and method. The apparatus comprises: a first transmitting unit, a first self-interference cancellation assembly and a first receiving unit, wherein the first self-interference cancellation assembly comprises a first electrical-optical conversion unit, a first directional coupler, K1 first interference simulation units, a second directional coupler and a first optical-electrical conversion unit; and an input end of the first self-interference cancellation assembly is connected between an output end of the first transmitting unit and a first transmitting antenna, and an output end of the first self-interference cancellation assembly is connected between an input end of the first receiving unit and a first receiving antenna. By deploying a self-interference cancellation assembly having a multi-path self-interference simulation capability, multi-path self-interference cancellation is implemented between each transmitting link and each receiving link, thereby increasing the cancellation depth and improving a self-interference suppression effect.

Description

Full-duplex communication apparatus and method

[0001] This application claims priority to the Chinese patent application No. 202410728367.9, filed on June 5, 2024, entitled "Full-duplex communication apparatus and method", the content of which is incorporated herein by reference in its entirety. TECHNICAL FIELD

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

[0003] In some communication systems, such as the 5th generation (5G) mobile communication system, the in-band full-duplex (IBFD) technology is often used to complete the transmitting and receiving functions simultaneously in one frequency band to improve the utilization efficiency of spectrum resources. In the communication system using the IBFD technology, the communication apparatus will be interfered by its own transmitted signal when receiving the signal, so how to effectively suppress the radio frequency self-interference is a key problem of the full-duplex technology.

[0004] At present, the analog radio frequency cancellation technology plays a key role in the full-duplex system, but the actual analog radio frequency cancellation technology interferes with the transmission on a single communication path, resulting in very limited cancellation depth. Therefore, how to improve the cancellation depth of the analog radio frequency cancellation and further improve the suppression effect of the radio frequency self-interference is a problem to be solved at present. SUMMARY

[0005] The full-duplex communication apparatus and method provided by the embodiments of the present application improve the cancellation depth of the analog radio frequency cancellation through the multipath self-interference, and further improve the suppression effect of the radio frequency self-interference.

[0006] In a first aspect, the present application provides a full-duplex communication device, comprising: a first sending unit, a first self-interference cancellation component, and a first receiving unit, wherein the first self-interference cancellation component comprises a first electro-optical conversion unit, a first directional coupler, K1 first interference analog units, a second directional coupler, and a first opto-electric conversion unit, K1 is an integer greater than 1. The input end of the first self-interference cancellation component is connected between the output end of the first sending unit and the first sending antenna, and the output end of the first self-interference cancellation component is connected between the input end of the first receiving unit and the first receiving antenna. The first sending unit is configured to output a first signal to the first self-interference cancellation component and the first sending antenna; the first electro-optical conversion unit is configured to convert the first signal into a first optical signal; the first directional coupler is configured to split the first optical signal to obtain K1 sub-signals, the K1 sub-signals correspond to the K1 first interference analog units one by one; each of the K1 first interference analog units is configured to modulate the corresponding sub-signal, and the modulated sub-signals output by different first interference analog units in the K1 first interference analog units have different frequencies; the second directional coupler is configured to combine the K1 modulated sub-signals to obtain a second optical signal; the first opto-electric conversion unit is configured to perform opto-electric conversion based on the second optical signal to obtain a first cancellation signal, and output the first cancellation signal to the first receiving unit; and the first receiving unit is configured to perform self-interference cancellation on a second signal received through the first receiving antenna based on the first cancellation signal. By deploying a self-interference cancellation component with multi-path self-interference simulation capability, multi-path self-interference cancellation between each sending link and each receiving link is achieved, the cancellation depth is improved, and the suppression effect of self-interference is improved. Further, the modulated sub-signals output by different interference analog units in the self-interference cancellation component have different frequencies, thereby avoiding interference of the sub-signal combining, causing rapid changes in the simulated multi-path self-interference, and further deteriorating the effect of analog radio frequency cancellation.

[0007] In a possible implementation, the K1 first interference analog units comprise a first interference analog unit A1 for modulating a first sub-signal and a first interference analog unit A2 for modulating a second sub-signal, in order to make the frequencies of the sub-signals modulated by different first interference analog units different, the first interference analog unit A1 comprises a frequency shifter for modulating the first sub-signal to a first frequency, the first frequency being different from the frequency of the second sub-signal modulated by the first interference analog unit A2, thereby avoiding interference of the sub-signal combining.

[0008] Optionally, the first interference analog unit A2 can comprise a frequency shifter for adjusting the second sub-signal to a second frequency.

[0009] In a possible implementation, each of the K1 first interference analog units comprises an optical delay device and / or an optical attenuator device. The signal coupled from the transmitting unit is processed in the optical domain (such as optical attenuation and / or optical delay) to simulate the self-interference on a transmission path.

[0010] In a possible implementation, the full-duplex communication apparatus can be a multi-antenna transmitting and single-antenna receiving communication apparatus, or a multi-antenna transmitting and multi-antenna receiving communication apparatus. In this case, the first transmitting unit can be a transmitting unit corresponding to any one of the multiple transmitting antennas (such as the first transmitting antenna). For example, in the case of two transmitting antennas and one receiving antenna, the full-duplex communication apparatus further comprises a second transmitting unit and a second self-interference cancellation component. The second self-interference cancellation component comprises a second electro-optical conversion unit, a third directional coupler, K2 second interference analog units, a fourth directional coupler, and a first opto-electric conversion unit, where K2 is an integer greater than 1, and K2 can be the same as or different from K1. The first opto-electric conversion unit is shared by the first self-interference cancellation component and the second self-interference cancellation component. The input end of the second self-interference cancellation component is connected between the output end of the second transmitting unit and the second transmitting antenna, and the output end of the second self-interference cancellation component is connected between the input end of the first receiving unit and the first receiving antenna. The second transmitting unit is configured to output a third signal to the second self-interference cancellation component and the second transmitting antenna. The second electro-optical conversion unit is configured to convert the third signal into a third optical signal. The third directional coupler is configured to split the third optical signal to obtain K2 sub-signals, and the K2 sub-signals correspond to the K2 second interference analog units in a one-to-one manner. Each of the K2 second interference analog units is configured to modulate the corresponding sub-signal. The fourth directional coupler is configured to combine the K2 modulated sub-signals to obtain a fourth optical signal. The first opto-electric conversion unit is specifically configured to perform opto-electric conversion based on the fourth optical signal and the second optical signal to obtain a first cancellation signal, and output the first cancellation signal to the first receiving unit. The first receiving unit is configured to perform self-interference cancellation on a second signal received through the first receiving antenna based on the first cancellation signal.

[0011] In the above implementation, the wavelength of the second optical signal converted by the first electro-optical conversion unit is different from the wavelength of the third optical signal converted by the second electro-optical conversion unit, so as to avoid interference when the two signals are combined, and thus avoid the deterioration of the self-interference cancellation effect caused by the change of the intensity of the combined optical signal over time due to the interference.

[0012] In a possible implementation, the full-duplex communication device can be implemented as a single-antenna transmitting and multi-antenna receiving communication device, or a multi-antenna transmitting and multi-antenna receiving communication device. In this case, the first receiving unit can be a receiving unit corresponding to any one of the receiving antennas (for example, the first receiving antenna). For example, in the case of one transmitting antenna and two receiving antennas, the full-duplex communication device can further include a second receiving unit and a third self-interference cancellation component. The third self-interference cancellation component includes a first electro-optical conversion unit, a fifth directional coupler, K3 third interference simulation units, a sixth directional coupler, and a third opto-electric conversion unit, where K3 is an integer greater than 1, and K3 can be the same as or different from K1, and K3 can be the same as or different from K2. The first electro-optical conversion unit is shared by the first self-interference cancellation component and the third self-interference cancellation component. The input end of the third self-interference cancellation component is connected between the output end of the first transmitting unit and the first transmitting antenna, and the output end of the third self-interference cancellation component is connected between the input end of the second receiving unit and the second receiving antenna. The first transmitting unit outputs a first signal to the third self-interference cancellation component and the first transmitting antenna. The first electro-optical conversion unit is specifically configured to convert the first signal into a fifth optical signal, and the fifth optical signal is split to obtain a first optical signal and a sixth optical signal. The fifth directional coupler is configured to split the sixth optical signal to obtain K3 sub-signals, and the K3 sub-signals correspond to the K3 third interference simulation units one by one. Each of the K3 third interference simulation units is configured to modulate the corresponding sub-signal. The sixth directional coupler is configured to combine the K3 modulated sub-signals to obtain a seventh optical signal. The third opto-electric conversion unit is configured to perform opto-electric conversion based on the seventh optical signal to obtain a second cancellation signal, and output the second cancellation signal to the second receiving unit. The second receiving unit is configured to perform self-interference cancellation on a fourth signal received through the second receiving antenna based on the second cancellation signal.

[0013] In a second aspect, the present application provides a full-duplex communication method. The method is applied to a communication device including a first transmitting unit and a first receiving unit, and includes: performing electro-optical conversion on a first signal to obtain a first optical signal, the first signal being a signal output by the first transmitting unit to a first transmitting antenna; modulating K1 sub-signals obtained by splitting the first optical signal to obtain a second optical signal, the second optical signal being obtained by combining K1 modulated sub-signals, the K1 modulated sub-signals having different frequencies, and K1 being an integer greater than 1; performing opto-electric conversion on the second optical signal to obtain a first cancellation signal; and performing self-interference cancellation on a second signal received by the first receiving unit through a second receiving antenna based on the first cancellation signal.

[0014] In a possible implementation, the K1 sub-signals obtained by splitting the first optical signal are modulated respectively, including: modulating the frequency, amplitude and / or time delay of each of the K1 sub-signals.

[0015] In a third aspect, the present application provides a communication device, comprising: a processor configured to execute the method according to the second aspect or any possible implementation of the second aspect by running a computer program or by a logic circuit.

[0016] In a possible implementation, the communication device further comprises: a memory configured to store the computer program.

[0017] In a fourth aspect, the present application provides a chip, comprising: a processor configured to call and run computer instructions from a memory, so that a device installed with the chip executes the method according to the second aspect or any possible implementation of the second aspect.

[0018] In a fifth aspect, the present application provides a communication system, comprising: the full-duplex communication device according to the first aspect or any possible implementation of the first aspect.

[0019] The beneficial effects of the third aspect to the fifth aspect and any possible implementation of the third aspect to the fifth aspect can refer to the beneficial effects of the first aspect and any possible implementation of the first aspect, which will not be repeated here. BRIEF DESCRIPTION OF DRAWINGS

[0020] FIG. 1 is a schematic diagram of the architecture of a mobile communication system to which the embodiments of the present application are applied.

[0021] FIG. 2 is a schematic diagram of self-interference cancellation according to an embodiment of the present application.

[0022] FIG. 3 is a schematic diagram of a self-interference transmission path simulation according to an embodiment of the present application.

[0023] FIG. 4 is a schematic diagram of a full-duplex communication device according to an embodiment of the present application.

[0024] FIG. 5 is a schematic diagram of self-interference cancellation according to an embodiment of the present application.

[0025] FIG. 6 is a schematic diagram of a full-duplex communication device according to an embodiment of the present application.

[0026] FIG. 7 is a schematic diagram of a full-duplex communication device according to an embodiment of the present application.

[0027] FIG. 8 is a schematic diagram of a full-duplex communication device according to an embodiment of the present application.

[0028] FIG. 9 is a schematic diagram of a full-duplex communication device according to an embodiment of the present application.

[0029] FIG. 10 is a schematic diagram of a filtering process according to an embodiment of the present application.

[0030] FIG. 11 is a flow diagram of a full-duplex communication method according to an embodiment of the present application.

[0031] FIG. 12 is a schematic block diagram of a communication device according to an embodiment of the present application. DETAILED DESCRIPTION

[0032] The technical solutions in the present application will be described below with reference to the accompanying drawings.

[0033] In the embodiments of the present application, "first", "second", "A1", "A2", and various numerical designations, letter designations, and the like are used only for the convenience of description and do not limit the scope of the embodiments of the present application. For example, different signals, different units, different modules, different devices, and the like are distinguished.

[0034] Division of different units and modules

[0035] In the embodiments of the present application, "at least one" means one or more, and "a plurality of" means two or more. The association relationship between the associated objects is described by "and / or", which means that there can be three kinds of relationships, for example, A and / or B, which can represent the following three cases: A exists alone, A and B exist together, and B exists alone, where A and B can be singular or plural. The character " / " generally represents an "or" relationship between the associated objects before and after it. "At least one of the following" or the like means any combination of these items, including any combination of single item or multiple items. For example, at least one of a, b, and c can represent: a, or b, or c, or a and b, or a and c, or b and c, or a, b, and c. Where a, b, and c can be single or multiple.

[0036] FIG. 1 is a schematic diagram of an architecture of a mobile communication system to which embodiments of the present application are applied. As shown in FIG. 1, the mobile communication system includes a core network device 110, a network device 120, and at least one terminal device (e.g., terminal device 130 and terminal device 140 in FIG. 1). The terminal device is connected to the network device in a wireless manner, and the network device is connected to the core network device in a wireless or wired manner. The core network device and the network device can be independent and different physical devices, or can be a same physical device in which functions of the core network device and logical functions of the network device are integrated, or can be a physical device in which part of the functions of the core network device and part of the functions of the network device are integrated. The terminal device can be fixed or movable. FIG. 1 is only a schematic diagram, and the communication system can further include other network devices, such as a wireless relay device and a wireless backhaul device, which are not shown in FIG. 1. Embodiments of the present application do not limit the number of the core network device, the network device, and the terminal device included in the mobile communication system.

[0037] In embodiments of the present application, the network device can be any device having a wireless transceiving function. The network device includes, but is not limited to, an evolved Node B (eNB), a home evolved Node B (HNB), a baseband unit (BBU), an access point (AP) in a wireless fidelity (WiFi) system, a wireless relay node, a wireless backhaul node, a transmission point (TP) or a transmission and reception point (TRP), a mobile switching center, a device-to-device (D2D) device, a vehicle-to-everything (V2X) device, a machine-to-machine (M2M) device, a device serving as a base station in unmanned aerial vehicle (UAV) communication, a network device in a non-terrestrial network (NTN) communication system (i.e., a device that can be deployed on a high-altitude platform, a satellite, or a high-altitude aircraft), a gNB in a 5G system, one or a group of antenna panels (including multiple antenna panels) of a base station in a 5G system, or a network node constituting a gNB or a transmission point, such as a BBU or a distributed unit (DU), without specific limitation in embodiments of the present application.

[0038] In some deployments, a gNB can include a centralized unit (CU) and a DU. The CU and the DU implement partial functions of the gNB respectively, and the CU and the DU can communicate through an F1 interface. The gNB can also include an active antenna unit (AAU). The AAU can implement partial physical layer processing functions, radio frequency processing, and related functions of an active antenna.

[0039] It can be understood that the network device can be a device including one or more of the CU node, the DU node, and the AAU node. In addition, the CU can be divided into a network device in a radio access network (RAN) or a network device in a core network (CN), which is not limited in the present application.

[0040] In the embodiments of the present application, the terminal device can also be referred to as a user equipment (UE), an access terminal, a user unit, a user station, a mobile station, a mobile station, a remote station, a remote terminal, a mobile device, a user terminal, a terminal, a wireless communication device, a user agent, or a user device.

[0041] The terminal device can be a device providing voice / data connectivity to a user, for example, a handheld device with wireless connection function, a vehicle-mounted device, etc. Currently, some examples of the terminal can be: a mobile phone, a pad, a computer (such as a notebook computer, a palm computer, etc.) with wireless transceiver function, a drone, a customer-premises equipment (CPE), a smart point of sale (POS) machine, a mobile internet device (MID), a virtual reality (VR) device, an augmented reality (AR) device, a wireless terminal in industrial control, a wireless terminal in self driving, a wireless terminal in remote medical, a wireless terminal in smart grid, a wireless terminal in transportation safety, a wireless terminal in smart city, a wireless terminal in smart home, a cellular phone, a cordless phone, a session initiation protocol (SIP) phone, a wireless local loop (WLL) station, a personal digital assistant (PDA), a handheld device with wireless communication function, a computing device or other processing device connected to a wireless modem, a vehicle-mounted device, a wearable device, a terminal device in a 5G network, or a terminal device in a system evolved after 5G, etc.

[0042] The network device and the terminal device can communicate through a licensed spectrum, can communicate through an unlicensed spectrum, or can communicate through both the licensed spectrum and the unlicensed spectrum. The network device and the terminal device can communicate through a spectrum below 6 gigahertz (GHz), can communicate through a spectrum at or above 6 GHz, or can communicate through both the spectrum below 6 GHz and the spectrum at or above 6 GHz. Embodiments of the present application do not limit the spectrum resources used between the network device and the terminal device.

[0043] It should be understood that the present application does not limit the specific forms of the network device and the terminal device.

[0044] The communication apparatus and the communication method provided in the application can be applied to various communication systems, for example, a Long Term Evolution (LTE) system, a 5G mobile communication system, and a mobile communication system evolved after 5G. The 5G mobile communication system can include non-standalone (NSA) and / or standalone (SA).

[0045] The communication apparatus and the communication method provided in the application can also be applied to machine type communication (MTC), Long Term Evolution-machine (LTE-M), a device to device (D2D) network, a machine to machine (M2M) network, an internet of things (IoT) network, or other networks.

[0046] Full-duplex technology, such as IBFD, refers to simultaneous signal transmission and signal reception on the same frequency. Full-duplex technology can effectively improve the spectrum utilization efficiency and the transmission data rate, and thus can be widely applied to radar communication, relay transmission, and future radio frequency communication systems. Compared with time division duplex (TDD) and frequency division duplex (FDD), full-duplex communication can double the spectrum efficiency of the communication system, and thus full-duplex communication has great application potential in wireless communication systems. For ease of description, the apparatus that communicates by using full-duplex technology will be referred to as a full-duplex communication apparatus in the following description. The full-duplex communication apparatus can be implemented as a communication device (such as the network device or the terminal device described above) or a component (such as a chip, a chip system, or other functional modules capable of invoking and executing programs) in the communication device.

[0047] The full-duplex communication apparatus is inevitably interfered by the signal transmitted by itself in the process of receiving the signal, that is, the full-duplex communication apparatus has radio frequency self-interference (referred to as self-interference). The full-duplex communication apparatus can include a transmitting module and a receiving module. The signal transmitted by the transmitting unit of the full-duplex communication apparatus is reflected by a reflector in the transmission path and then transmitted to the receiving unit. When the full-duplex communication apparatus receives the signal by using the receiving unit, the signal received by the receiving unit is interfered by the signal transmitted by the transmitting unit. Therefore, it is necessary to perform self-interference cancellation on the signal received by the receiving unit to obtain a useful signal from the received signal.

[0048] Since the frequency of the signal transmitted by the full-duplex device is the same as the frequency of the signal received, a filter cannot be used to eliminate the interference signal in the received signal, and therefore how to effectively eliminate the radio frequency self-interference is a key problem of the full-duplex technology. The self-interference elimination can also be referred to as self-interference suppression or cancellation, and the different terms are used interchangeably in the present application for the purpose of expression, and the meaning is consistent. For the purpose of expression, the order of the words can be changed, and the meaning is unchanged. For example, self-interference suppression can be replaced by suppression of self-interference, and self-interference elimination can be replaced by elimination of self-interference.

[0049] The self-interference elimination technology used by the full-duplex communication device can include but is not limited to the following three: spatial isolation, analog radio frequency cancellation, or digital cancellation. The above three self-interference elimination technologies can be used in combination to improve the cancellation ability. When used in combination, the analog radio frequency cancellation can prevent the saturation of the low-noise amplifier (LNA) and the analog-to-digital converter (ADC), and thus ensure that the digital cancellation in the later stage works in a suitable dynamic range. As can be seen, the analog radio frequency cancellation plays a key role in the full-duplex system. However, the actual analog radio frequency cancellation bandwidth and scale are difficult to meet the demand. Based on this, it is considered to realize analog radio frequency cancellation in the optical domain based on microwave photonics technology. Microwave photonics technology aims to use optoelectronic principles and related optoelectronic devices to generate, process, measure or transmit microwave signals (the frequency of the microwave signal is generally between 300 MHz and 300 GHz). On the one hand, optical devices and optical modules generally have a large bandwidth, so moving the microwave spectrum to the optical domain for processing has a larger cancellation bandwidth (such as more than 1 GHz); on the other hand, the optical frequency is generally four orders of magnitude higher than the radio frequency, so the feature size of the optical device is much smaller than that of the microwave device, and thus the realization of analog radio frequency cancellation based on optoelectronics makes it possible to realize large-scale analog radio frequency cancellation in a multi-antenna system.

[0050] The self-interference elimination of the full-duplex communication device based on the principle of optoelectronics will be described below with reference to FIG. 2. Referring to FIG. 2, the full-duplex communication device 200 can include a transmitting module 210, a self-interference elimination module 220, and a receiving module 230.

[0051] The sending module 210 can include one or more sending units and a sending antenna corresponding to each sending unit. The sending module 210 can send a signal 1 to a communication device in a communication system through part or all of the sending units and the sending antennas corresponding to the sending units. The application does not limit the transmission mode of the signal 1 sent by the sending module 210. For example, the sending module 210 can transmit the signal 1 in a broadcast, unicast, multicast or groupcast manner, and the application also does not limit the receiving end of the signal 1. The signal 1 sent by the sending module 210 can include uplink transmission signaling / data, downlink transmission signaling / data, or sidelink transmission signaling / data, etc.

[0052] Each sending unit can include a transmitting chain and a power amplifier. In the process of sending the signal 1, the transmitting chain converts a baseband signal into a radio frequency signal and outputs it to the power amplifier, the power amplifier amplifies the radio frequency signal to ensure that the signal can cover the required transmission distance, and the power amplifier outputs the amplified radio frequency signal to the sending antenna, and the sending antenna converts the radio frequency signal into radio waves for space propagation.

[0053] As mentioned earlier, after the signal 1 sent by the sending module 210 propagates in space and is reflected by the reflector, some radio waves of the signal 1 will also be received by the receiving module 230, causing self-interference to the signal received by the receiving module 230.

[0054] The receiving module 230 can include one or more receiving units and a receiving antenna corresponding to each receiving unit. The receiving module 230 can receive a signal 2 from a communication system through part or all of the receiving units and the receiving antennas corresponding to the receiving units. The signal 2 can include a useful signal and an interference signal, and the interference signal includes self-interference signals generated by the transmission of the above-mentioned signal 1. The application does not limit the transmission mode of the useful signal in the signal 2. For example, the useful signal in the signal 2 can be transmitted in a broadcast, unicast, multicast or groupcast manner, and the application also does not limit the sending end of the useful signal in the signal 2. The signal 2 received by the receiving module 230 can include uplink transmission signaling / data, downlink transmission signaling / data, or sidelink transmission signaling / data, etc.

[0055] Each receiving unit can include a receiving chain and a low-noise amplifier. In the process of receiving the signal 2, the receiving antenna converts the received radio waves into an electrical signal and outputs it to the low-noise amplifier, the low-noise amplifier amplifies the electrical signal and outputs the amplified electrical signal to the receiving chain, and then the receiving chain obtains a baseband signal through signal conversion.

[0056] The self-interference cancellation module 220 is connected between the transmitting module 210 and the receiving module 230, and is used to simulate a transmission path between the transmitting module 210 and the receiving module 230, and then cancel the self-interference signal in the signal 2. The self-interference cancellation module 220 can include one or more self-interference cancellation components, each of which is connected between a transmitting unit of the transmitting module 210 and a receiving unit of the receiving module 230, and is used to simulate a signal transmission path between the transmitting unit and the receiving unit.

[0057] The input end of each self-interference cancellation component in the self-interference cancellation module 220 is connected between the output end of the corresponding transmitting unit and the transmitting antenna, and is coupled to obtain the signal output by the transmitting unit. The output end of the self-interference cancellation component is connected between the input end of the corresponding receiving unit and the receiving antenna, and is used to output a cancellation signal, so that the receiving module 230 cancels the self-interference signal in the signal 2 based on the cancellation signal, and realizes self-interference cancellation. Each self-interference cancellation component can include an electro-optical conversion unit, an optical domain processing unit, and an optical-electric conversion unit. The electro-optical conversion unit can perform electro-optical conversion on the coupled signal to obtain an optical signal. Then, the optical domain processing unit processes the optical signal in the optical domain to simulate the transmission path. Based on the processing function of the optical domain processing unit, the optical domain processing unit can also be referred to as an optical path simulator. The optical-electric conversion unit converts the processed optical signal into an electrical signal, that is, obtains the cancellation signal on the transmission path, and outputs the cancellation signal to the input end of the corresponding receiving unit. The receiving unit performs self-interference cancellation on the signal received by the receiving antenna based on the cancellation signal.

[0058] Referring to FIG. 3, in each self-interference cancellation component, the optical domain processing unit can perform optical domain processing (such as optical attenuation and / or optical delay) on the signal coupled from the transmitting unit in the optical domain, so as to simulate the self-interference on a transmission path. In other words, each self-interference cancellation component is used to realize single-path self-interference cancellation between one transmitting link and one receiving link in the full-duplex communication device.

[0059] However, in actual communication scenarios, due to factors such as near-end reflection or radio frequency coupling effect, the self-interference caused by the signal transmitted by the transmitting link after space propagation and reflection on the signal received by the receiving link contains rich multipath. Therefore, the depth of the self-interference cancellation realized based on the above self-interference cancellation module is limited, resulting in poor self-interference cancellation effect. In view of this, in the embodiments of the present application, a self-interference cancellation component with multipath self-interference simulation capability is deployed in the full-duplex communication device, so as to realize multi-path self-interference cancellation between each transmitting link and each receiving link, improve the cancellation depth, and improve the suppression effect of the self-interference.

[0060] The full-duplex communication device provided by the embodiment of the present application will be described below with reference to the accompanying drawings.

[0061] FIG. 4 is a structural schematic diagram of a full-duplex communication device provided by the embodiment of the present application. The full-duplex communication device 300 shown in FIG. 4 can be implemented as a communication device with single antenna transmission and single antenna reception, or the full-duplex communication device can be implemented as a communication device with multiple antenna transmission and single antenna reception, or the full-duplex communication device can be implemented as a communication device with single antenna transmission and multiple antenna reception, or the full-duplex communication device can be implemented as a communication device with multiple antenna transmission and multiple antenna reception, which is not limited in the present application.

[0062] Referring to FIG. 4, the full-duplex communication device 300 comprises a first sending unit 310, a first self-interference cancellation component 320 and a first receiving unit 330. The input end of the first self-interference cancellation component 320 is connected between the output end of the first sending unit 310 and the first sending antenna, and the output end of the first self-interference cancellation component 320 is connected between the input end of the first receiving unit 330 and the first receiving antenna. Wherein, the first sending antenna can belong to the full-duplex communication device 300, or the first sending antenna can be independent of the full-duplex communication device 300, such as when the full-duplex communication device 300 is implemented as a component of a communication device, the first sending antenna and the full-duplex communication device 300 can belong to the same communication device; the deployment relationship between the first receiving antenna and the full-duplex communication device 300 is similar, which is not described again for the sake of brevity.

[0063] For example, the first sending unit 310 is configured to output a first signal to the first self-interference cancellation component 320 and the first sending antenna, or in other words, the first self-interference cancellation component 320 couples the first signal from the transmission channel between the first sending unit 310 and the first sending antenna; the first self-interference cancellation component 320 is configured to convert the first signal into an optical signal, simulate the multipath self-interference in the optical domain, convert the simulated optical signal into an electrical signal, i.e., a first cancellation signal, and finally output the cancellation signal to the first receiving unit 330; the first receiving unit 330 is configured to perform self-interference cancellation on a second signal received through the first receiving antenna based on the first cancellation signal, so as to eliminate the self-interference formed by the first signal reaching the first receiving antenna through the air interface.

[0064] To implement the multipath self-interference cancellation between the first sending unit 310 and the first receiving unit 330 by the first self-interference cancellation component 320, the first self-interference cancellation component 320 in the embodiment of the application can include a structure as shown in FIG. 4. Referring to FIG. 4, the first self-interference cancellation component 320 can include a first electro-optical conversion unit 321, a first directional coupler 322, K1 first interference analog units (323-1 to 323-K1), a second directional coupler 324, and a first opto-electric conversion unit 325, where K1 is an integer greater than 1. For example, the input end of the first electro-optical conversion unit 321 is connected between the output end of the first sending unit 310 and the first sending antenna, the output end of the first electro-optical conversion unit 321 is connected with the input end of the first directional coupler 322, the output end of the first directional coupler 322 is connected with the input end of each of the K1 first interference analog units (323-1 to 323-K1), the output end of each of the K1 first interference analog units (323-1 to 323-K1) is connected with the second directional coupler 324, the output end of the second directional coupler 324 is connected with the input end of the first opto-electric conversion unit 325, and the output end of the first opto-electric conversion unit 325 is connected between the input end of the first receiving unit 330 and the first receiving antenna.

[0065] For example, the first electro-optical conversion unit 321 converts the first signal into a first optical signal, and then implements the simulation of the transmission path of the self-interference by performing signal processing in the optical domain.

[0066] For example, the first directional coupler 322 splits the first optical signal converted by the first opto-electric conversion unit 321 to obtain K1 sub-signals. Optionally, the first directional coupler 322 can split the first optical signal based on power, and the power of the K1 sub-signals obtained by splitting can be the same or different, which is not limited in the application.

[0067] In the above example, the K1 sub-signals correspond to the K1 first interference analog units (such as 323-1 to 323-K1) one by one, and the first directional coupler 322 can input each of the K1 sub-signals into the corresponding first interference analog unit. Each of the K1 first interference analog units (such as 323-1 to 323-K1) modulates the input sub-signal to simulate the multiple transmission paths of the first sending unit 310 and the first receiving unit 330. Further, each of the first interference analog units (such as 323-1 to 323-K1) inputs the modulated sub-signal into the second directional coupler 324, and the second directional coupler 324 combines the K1 modulated sub-signals to obtain a second optical signal.

[0068] Regarding the aforementioned K1 first interference simulation units (such as 323-1 to 323-K1), it should be noted that each first interference simulation unit is used to simulate different transmission paths. Based on this, the first interference simulation unit can perform optical processing according to the transmission path it is simulating to adjust the amplitude and / or delay of the sub-signal input to the first interference unit. By modulating the amplitude and / or delay of the sub-signal passing through the first interference simulation unit, the self-interference of a transmission path can be simulated.

[0069] It should be noted that the K1 sub-signals output by the first directional coupler 322 are obtained by splitting the first optical signal. Generally speaking, the K1 sub-signals have the same wavelength. Therefore, when the modulated K1 sub-signals output by the K1 first interference simulation units (such as 323-1 to 323-K1) are combined at the second directional coupler 324, interference will occur. Referring to Figure 5, the first electro-optic conversion unit 321 converts the first signal into a first optical signal with a wavelength of λ. The first directional coupler 322 splits the first optical signal based on power to obtain K1 sub-signals with wavelengths of λ. These K1 sub-signals are then input into K1 first interference simulation units for modulation. Due to differences in modulation paths, ambient temperature, and refractive index / optical path length among the different first interference simulation units, the modulated sub-signals exhibit different time-varying random phases ψ(t). These time-varying random phases ψ(t) cause interference in the combined second optical signal, and the interference result changes over time. Consequently, when the first photoelectric conversion unit 330 converts the second optical signal into a first cancellation signal, the time-varying random phase ψ(t) determines the amplitude noise of the first cancellation signal. Therefore, the interference intensity changes over time, causing the simulated multipath self-interference to change rapidly, severely deteriorating the effect of simulated radio frequency cancellation.

[0070] In view of this, in the embodiments of this application, the frequencies of the modulated sub-signals output by different first interference simulation units in K1 of the first interference simulation units (such as 323-1 to 323-K1) should be different. That is, at least K1-1 of the K1 first interference simulation units (such as 323-1 to 323-K1) modulate (or shift) the frequency of the input sub-signals to avoid interference when the second directional coupler 324 performs optical combining.

[0071] Both the first directional coupler 322 and the second directional coupler 324 are directional couplers. The difference between them is that the first directional coupler 322 is used to split circuits, while the second directional coupler 324 is used to combine circuits. The same directional coupler can switch between combining and splitting functions by switching its input and output ports.

[0072] In some embodiments, referring to FIG. 6, the first transmitting unit 310 can include a first transmitting chain and a power amplifier, an output end of the first transmitting chain and an input end of the power amplifier are connected, and an output end of the power amplifier is connected with the first transmitting antenna and the first self-interference cancellation component 320. In the process of transmitting the first signal, the first transmitting chain can convert a baseband signal into a radio frequency signal and output the radio frequency signal to the power amplifier, the power amplifier amplifies the radio frequency signal to ensure that the signal can cover the required transmission distance, the power amplifier outputs the amplified radio frequency signal to the transmitting antenna, and the transmitting antenna converts the radio frequency signal into radio waves for space propagation. The first signal coupled from the transmitting channel between the first transmitting unit 310 and the first transmitting antenna in the first self-interference cancellation component 320 can be the radio frequency signal amplified by the power amplifier. It can be understood that the architecture of the first transmitting unit 310 is not limited in the present application, and the first transmitting unit 310 can include more or fewer components.

[0073] In some embodiments, referring to FIG. 6, the first electro-optical conversion unit 321 in the first self-interference cancellation component 320 can include a laser, and the first signal coupled from the transmitting channel of the first transmitting chain drives the laser to achieve electro-optical conversion.

[0074] In some embodiments, referring to FIG. 6, the K1 first interference analog units (such as 323-1 to 323-K1) in the first self-interference cancellation component 320 include a first interference analog unit A1 for modulating the first sub-signal and an interference analog unit A2 for modulating the second sub-signal. It should be understood that the first interference analog unit A1 and the interference analog unit A2 can be any two first interference analog units of the K1 first interference analog units.

[0075] For example, the first interference analog units (such as A1 and A2) can be deployed with optical delay devices and optical attenuator devices to modulate the sub-signals of the input first optical signal, such as delay modulation by the optical delay device and amplitude modulation by the optical attenuator device, in order to achieve simulation of the self-interference transmission path. It should be noted that the devices deployed in the first interference analog units in the present embodiment are only exemplary descriptions, and more or fewer components can also be included. It should also be understood that different first interference analog units can be deployed with different types of components, such as the first interference analog unit A1 deploying an optical delay device and the first interference analog unit A2 deploying an optical attenuator device; if the first interference analog unit A1 and the first interference analog unit A2 are deployed with the same type of device, such as both deploying an optical delay device and an optical attenuator device, in order to simulate different self-interference transmission paths, the same type of device in the first interference analog unit A1 and the first interference analog unit A2 should be set with different modulation parameters.

[0076] As mentioned above, in order to avoid the modulated sub-signals outputted by the K1 first interference simulation units (e.g. 323-1 to 323-K1) interfering with each other when combined, the frequencies of the modulated sub-signals outputted by different first interference simulation units should be different. Based on this, the first interference simulation unit A1 includes a frequency shifter for modulating the first sub-signal to a first frequency, which is different from the frequency of the second sub-signal modulated by the first interference simulation unit A2.

[0077] As a first example, since the frequency shifter deployed in the first interference simulation unit A1 can modulate the first sub-signal to a first frequency domain different from the second sub-signal, the first interference simulation unit A2 can not deploy a frequency shifter; as a second example, the first interference simulation unit A2 can include a frequency shifter for modulating the second sub-signal to a second frequency.

[0078] If the K1 first interference simulation units (e.g. 323-1 to 323-K1) further include a first interference simulation unit A3 in addition to the first interference simulation units A1 and A2. In the above first example, in order to make the frequency of the third sub-signal modulated by the first interference simulation unit A3 different from the frequency of the second sub-signal, the first interference simulation unit A3 can include a frequency shifter for modulating the third sub-signal to a third frequency; in the above second example, since the first interference simulation unit A1 includes a frequency shifter for modulating the first sub-signal to a first frequency, and the first interference simulation unit A2 includes a frequency shifter for modulating the second sub-signal to a second frequency, the first interference simulation unit A3 can not deploy a frequency shifter, or the first interference simulation unit A3 can include a frequency shifter for modulating the first sub-signal to a third frequency.

[0079] In summary, the frequencies of the sub-signals modulated by the K1 first interference simulation units (e.g. 323-1 to 323-K1) are all different. In order to avoid the second directional coupler from interfering with the sub-signals after combining the sub-signals.

[0080] In some embodiments, referring to FIG. 6, the first photoelectric conversion unit 325 in the first self-interference cancellation assembly 320 can include a light detector for converting the second optical signal obtained by combining the second directional coupler into a first cancellation signal.

[0081] In some embodiments, referring to FIG. 6, the first receiving unit 330 can include a first receiving chain and an electrical combiner, an input end of the electrical combiner is connected to the first self-interference cancellation component 320 and the first receiving antenna, and an output end of the electrical combiner is connected to an input end of the first receiving chain. The electrical combiner is used to combine the second signal received by the first receiving antenna and the first cancellation signal output by the first self-interference cancellation component 320, so as to realize self-interference cancellation of the second signal, obtain a second signal after self-interference cancellation, and output the second signal to the first receiving chain. The first receiving chain converts the second signal after self-interference cancellation into a baseband signal, so as to realize signal receiving. It can be understood that the architecture of the first receiving unit 330 is not limited in the present application, and the first receiving unit 330 can further include more or fewer components, for example, the first receiving unit 330 can further include a low-noise amplifier, the low-noise amplifier can be connected between the electrical combiner and the first receiving chain, the low-noise amplifier amplifies the second signal after self-interference cancellation, and outputs the amplified second signal to the first receiving chain, and then the second receiving chain converts the signal to obtain the baseband signal.

[0082] In any of the above embodiments, the self-interference cancellation between the first transmitting unit 310 and the first receiving unit 330 is taken as an example for description.

[0083] When the full-duplex communication device in the embodiment shown in FIG. 4 is implemented as a multi-antenna transmitting and single-antenna receiving communication device, each of the multiple transmitting antennas corresponds to a transmitting unit, and the first transmitting unit 310 can be a transmitting unit corresponding to any transmitting antenna (for example, a first transmitting antenna) in the multiple transmitting antennas. For example, referring to FIG. 7, a full-duplex communication device implemented as a multi-antenna transmitting and single-antenna receiving communication device is taken as an example for description, taking two transmitting antennas and one receiving antenna as an example. In addition to the components shown in FIG. 4, the full-duplex communication device 400 can further include a second transmitting unit 410 and a second self-interference cancellation component 420, wherein the second self-interference cancellation component 420 includes a second electro-optical conversion unit 421, a third directional coupler 422, K2 second interference simulation units (for example, 423-1 to 423-K2), a fourth directional coupler 424, and a first opto-electric conversion unit 325, K2 is an integer greater than 1, and K2 can be the same as or different from K1, and the first opto-electric conversion unit 325 is shared by the first self-interference cancellation component 320 and the second self-interference cancellation component 420.

[0084] For example, an input end of the second self-interference cancellation component 420 is connected between an output end of the second transmitting unit 410 and the second transmitting antenna, and an output end of the second self-interference cancellation component 420 is connected between an input end of the first receiving unit 330 and the first receiving antenna.

[0085] The second sending unit 410 is configured to output a third signal to the second self-interference cancellation assembly 420 and the second sending antenna; the second electro-optical conversion unit 421 is configured to convert the third signal into a third optical signal; the third directional coupler 422 is configured to split the third optical signal into K2 sub-signals, and the K2 sub-signals correspond to K2 second interference analog units (for example, 423-1 to 423-K2) one by one; each of the K2 second interference analog units (for example, 423-1 to 423-K2) is configured to modulate the corresponding sub-signal; and the fourth directional coupler 424 is configured to combine the K2 modulated sub-signals into a fourth optical signal.

[0086] The second sending unit 410 can refer to the description of the first sending unit 310 in the foregoing examples, and the second self-interference cancellation assembly 420 and components in the second self-interference cancellation assembly 420 can refer to the description of the first self-interference cancellation assembly 320 and components in the first self-interference cancellation assembly 320 in the foregoing examples, and details are not described herein again for simplicity.

[0087] In this embodiment, the second optical signal is used to simulate the multipath self-interference between the first sending antenna and the first receiving antenna, and the fourth optical signal is used to simulate the multipath self-interference between the second sending antenna and the first receiving antenna. Therefore, the first cancellation signal can be obtained by the first photoelectric conversion unit 325 based on the fourth optical signal and the second optical signal, and the first cancellation signal is output to the first receiving unit 330.

[0088] The first receiving unit 330 can perform self-interference cancellation on the second signal received by the first receiving antenna based on the first cancellation signal.

[0089] The first self-interference cancellation assembly 320 and the second self-interference cancellation assembly 420 can further include a wavelength division multiplexer, that is, the first self-interference cancellation assembly 320 and the second self-interference cancellation assembly 420 multiplex the wavelength division multiplexer, an input end of the wavelength division multiplexer is connected with the first self-interference cancellation assembly 320 and the second self-interference cancellation assembly 420, an output end of the wavelength division multiplexer is connected with the first photoelectric conversion unit 325, and the wavelength division multiplexer is configured to combine the second optical signal output by the second directional coupler 324 and the third optical signal output by the fourth directional coupler 424.

[0090] The wavelength of the second optical signal converted by the first electro-optical conversion unit 321 is different from the wavelength of the third optical signal converted by the second electro-optical conversion unit 421, so as to avoid interference when the two signals are combined, and to avoid that the light intensity after combination changes with time due to the interference, and to avoid that the self-interference cancellation effect is deteriorated.

[0091] The full-duplex communication device in the embodiment shown in FIG. 4 is implemented as a single-antenna transmission and multi-antenna reception communication device, each of the multiple receiving antennas corresponds to a receiving unit, and the first receiving unit 330 can be a receiving unit corresponding to any receiving antenna (e.g., the first receiving antenna) in the multiple receiving antennas. For example, referring to FIG. 8, a single-antenna transmission and multi-antenna reception full-duplex communication device is exemplarily described by taking a single-antenna transmission and two-antenna reception as an example. In addition to the components shown in FIG. 4, the full-duplex communication device 500 can further include a second receiving unit 530 and a third self-interference cancellation component 520, wherein the third self-interference cancellation component 520 includes a first electro-optical conversion unit 321, a fifth directional coupler 522, K3 third interference simulation units (e.g., 523-1 to 523-K3), a sixth directional coupler 524, and a third opto-electric conversion unit 525, K3 is an integer greater than 1, and K3 can be the same as or different from K1, and K3 can be the same as or different from K2 described above. The first electro-optical conversion unit 321 is shared by the first self-interference cancellation component 320 and the third self-interference cancellation component 520.

[0092] For example, the input end of the third self-interference cancellation component 520 is connected between the output end of the first transmission unit 310 and the first transmission antenna, and the output end of the third self-interference cancellation component 520 is connected between the input end of the second receiving unit 530 and the second receiving antenna.

[0093] For example, the first transmission unit 310 outputs the first signal to the third self-interference cancellation component 520 and the first transmission antenna.

[0094] In this embodiment, it is necessary to simulate the multipath self-interference between the first transmission antenna and the first receiving antenna, and it is also necessary to simulate the multipath self-interference between the first transmission antenna and the second receiving antenna. Therefore, the signal converted by the first electro-optical conversion unit 321 includes the first signal processed in the optical domain in the first self-interference cancellation component 320, and also includes the third signal processed in the optical domain in the third self-interference cancellation component 520. For example, the first electro-optical conversion unit 321 can convert the first signal into a fifth optical signal, and the fifth optical signal is split into a first optical signal and a sixth optical signal.

[0095] The first self-interference cancellation component 320 is consistent with the embodiment shown in FIG. 4 described above.

[0096] For example, the fifth directional coupler 522 splits the sixth optical signal into K3 sub-signals, and the K3 sub-signals correspond to K3 third interference analog units (e.g., 523-1 to 523-K3) one by one; each of the K3 third interference analog units (e.g., 523-1 to 523-K3) is configured to modulate the corresponding sub-signal; the sixth directional coupler 524 combines the K3 modulated sub-signals to obtain a seventh optical signal; the third photoelectric conversion unit performs photoelectric conversion based on the seventh optical signal to obtain a second cancellation signal, and outputs the second cancellation signal to the second receiving unit 530; and the second receiving unit 530 performs self-interference cancellation on the fourth signal received by the second receiving antenna based on the second cancellation signal.

[0097] The third self-interference cancellation assembly 520 and the components in the third self-interference cancellation assembly 520 can refer to the related descriptions of the first self-interference cancellation assembly 320 and the components in the first self-interference cancellation assembly 320 in the foregoing examples, and will not be described herein for brevity.

[0098] It can be understood that, in the case where the full-duplex communication device is implemented as a multi-antenna transmitting and multi-antenna receiving communication device, the embodiment shown in FIG. 7 and the embodiment shown in FIG. 8 can be combined with each other.

[0099] In the following, the full-duplex communication device is implemented as a multi-antenna transmitting and multi-antenna receiving communication device, and will be described by way of example with reference to FIG. 9. Referring to FIG. 9, the full-duplex communication device 600 can be implemented as a communication device with N transmitting antennas (e.g., transmitting antenna 1 to transmitting antenna N) and M receiving antennas (e.g., receiving antenna 1 to receiving antenna M). N is an integer greater than 1, and M is an integer greater than 1.

[0100] The full-duplex communication device 600 can include N transmitting units corresponding to the N transmitting antennas respectively, and each transmitting unit can include a transmitting chain and a power amplifier. For example, the transmitting unit connected to the transmitting antenna 1 can include a transmitting chain 1 and a power amplifier 1, the transmitting unit connected to the transmitting antenna 2 can include a transmitting chain 2 and a power amplifier 2, and so on.

[0101] The full-duplex communication device 600 can include N lasers (e.g., laser 1 to N) corresponding to the N transmitting antennas respectively, and the wavelengths of the optical signals output by the N lasers are different from each other.

[0102] The full-duplex communication device 600 can include N*M multi-path self-interference analog modules, which are configured to perform multi-path self-interference path simulation on each of the N*M self-interference transmission paths between the N transmitting antennas and the M receiving antennas. Optionally, each multi-path self-interference analog module can include a directional coupler 01, at least two interference analog units, and a directional coupler 02.

[0103] The full-duplex communication apparatus 600 can include M wavelength division multiplexers (e.g., wavelength division multiplexer 1 to M), M amplifiers (e.g., amplifier 1 to M), M optical detectors (e.g., optical detector 1 to M), and M filters (e.g., filter 1 to M), the input of each of the M wavelength division multiplexers is connected to the output of the multiple multipath self-interference analog modules. The wavelength division multiplexers, amplifiers, optical detectors, and filters are connected in series, for example, wavelength division multiplexer 1, amplifier 1, optical detector 1, and filter 1 are connected in series, wavelength division multiplexer 2, amplifier 2, optical detector 2, and filter 2 are connected in series, and so on.

[0104] The input of each wavelength division multiplexer includes N optical signals of different wavelengths. After wavelength division multiplexing, optical amplification, and photoelectric detection, the optical signals are converted into electrical signals. For example, the optical signals entering a certain detector have H (H is equal to the sum of the number of interference simulation units of the N multipath self-interference analog modules) components, the self-beat frequencies of the optical signals overlap in the electrical spectrum, and the mutual beat frequencies of the optical signals are dispersed in the electrical spectrum. Referring to FIG. 10, the filter response of the filter connected to the optical detector can filter out the mutual beat frequencies and retain the self-beat frequencies of the optical signals to eliminate interference.

[0105] The full-duplex communication apparatus 600 can include a receiving unit connected to each of the M receiving antennas (e.g., receiving antenna 1 to M). For example, the receiving unit can include a receiving chain and a low-noise amplifier. For example, the receiving unit connected to receiving antenna 1 can include receiving chain 1 and low-noise amplifier 1, the receiving unit connected to receiving antenna 2 can include receiving chain 2 and low-noise amplifier 2, and so on.

[0106] It can be understood that when the full-duplex communication apparatus is implemented as a multi-antenna transmission and multi-antenna reception communication apparatus as shown in FIG. 9, the first transmitting antenna and the first receiving antenna in FIG. 4 can be any transmitting antenna and receiving antenna in the full-duplex communication apparatus 600, for example, the first transmitting antenna is transmitting antenna 1 and the first receiving antenna is receiving antenna 1, and the related components in the full-duplex communication apparatus 300 shown in FIG. 4 can be implemented as the components in FIG. 9 for eliminating self-interference between transmitting antenna 1 and receiving antenna 1. Similarly, the components in the full-duplex communication apparatus 400 in FIG. 7 can be part of the components in FIG. 9 for implementing multipath self-interference cancellation on part of the transmission paths therein, and the components in the full-duplex communication apparatus 500 in FIG. 8 can be part of the components in FIG. 9 for implementing multipath self-interference cancellation on part of the transmission paths therein.

[0107] It should be noted that the connection relationship and the devices in the full-duplex communication apparatus 600 in FIG. 9 are described for illustration, and can be referred to the description in any of the foregoing embodiments. In addition, the devices in the full-duplex communication apparatus 600 in FIG. 9 are only examples, and more or fewer devices can be included in actual application scenarios.

[0108] Therefore, the full-duplex communication apparatus provided by the embodiments of the present application can achieve self-interference cancellation of multiple paths between each sending link and each receiving link by deploying a self-interference cancellation component with a multipath self-interference simulation capability, improve the cancellation depth, and improve the suppression effect of self-interference.

[0109] Further, the frequencies of the modulated sub-signals output by different interference simulation units in the self-interference cancellation component are different, thereby avoiding interference of the sub-signals in the combining, causing rapid changes in the simulated multipath self-interference, and further deteriorating the effect of analog radio frequency cancellation.

[0110] FIG. 11 is a flow diagram of a full-duplex communication method 700 provided by an embodiment of the present application. The execution subject of the method can be the full-duplex communication apparatus in any of the foregoing embodiments, or a chip or a functional module in the full-duplex communication apparatus. Referring to FIG. 11, the method includes:

[0111] S710, the communication apparatus performs electro-optical conversion on the first signal to obtain a first optical signal, the first signal being a signal output by a first sending unit of the communication apparatus to a first sending antenna of the communication apparatus;

[0112] S720, the communication apparatus modulates K1 sub-signals obtained by splitting the first optical signal to obtain a second optical signal, the second optical signal being obtained by combining K1 modulated sub-signals, the frequencies of the K1 modulated sub-signals being different, K1 being an integer greater than 1;

[0113] S730, the communication apparatus performs optical-electrical conversion on the second optical signal to obtain a first cancellation signal;

[0114] S740, the communication apparatus performs self-interference cancellation on a second signal received by a first receiving unit through a second receiving antenna based on the first cancellation signal.

[0115] In some embodiments, the communication apparatus can modulate the frequency, amplitude and / or time delay of each of the K1 sub-signals.

[0116] The related technical solutions and effects in the method have been described in the foregoing embodiments of the full-duplex communication apparatus, and will not be described again for brevity.

[0117] FIG. 12 is a schematic block diagram of a communication apparatus provided in embodiments of the present application. As shown in FIG. 12, the communication apparatus 800 can include a processor 810. The processor 810 can be configured to execute the methods in the method embodiments described above.

[0118] In some possible implementation, the communication apparatus 800 can include a transceiver 820. The transceiver 820 can communicate with the processor 810 via an internal connection path. The processor 810 can control the transceiver 820 to send and / or receive signals.

[0119] In some possible implementation, the communication apparatus 800 can include a memory 830. The memory 830 can communicate with the processor 810 via an internal connection path. The memory 830 and the processor 810 can be integrated together or separately arranged. The memory 830 can also be a memory outside the apparatus. The memory 830 is configured to store instructions, and the processor 810 is configured to execute the instructions stored in the memory 830 to perform the methods in the method embodiments described above.

[0120] It should be understood that the communication apparatus 800 can correspond to the method embodiments described above, and can be configured to execute the steps and / or flows in the method embodiments described above. Optionally, the memory 830 can include a read-only memory and a random access memory, and provide instructions and data for the processor. A part of the memory can also include a non-volatile random access memory. The memory 830 can be a separate device, or integrated in the processor 810. The processor 810 can be configured to execute the instructions stored in the memory 830, and when the processor 810 executes the instructions stored in the memory, the processor 810 is configured to perform the steps and / or flows in the method embodiments described above.

[0121] Optionally, the communication apparatus 800 is a full-duplex communication apparatus in the foregoing embodiments.

[0122] The transceiver 820 can include a transmitter and a receiver. The transceiver 820 can further include an antenna, and the number of antennas can be one or more. The processor 810 and the memory 830 and the transceiver 820 can be devices integrated on different chips. For example, the processor 810 and the memory 830 can be integrated in a baseband chip, and the transceiver 820 can be integrated in a radio frequency chip. The processor 810 and the memory 830 and the transceiver 820 can also be devices integrated on the same chip. The present application does not make any limitation in this regard.

[0123] Optionally, the communication apparatus 800 is a component, such as a chip, a chip system, etc., arranged in a terminal device.

[0124] Optionally, the communication apparatus 800 is a component configured in a network device, such as a chip, a chip system, etc.

[0125] The transceiver 820 can also be a communication interface, such as an input / output interface, a circuit, etc. The transceiver 820 can be integrated with the processor 810 and the memory 830 in the same chip, such as in a baseband chip.

[0126] The present application also provides a processing apparatus, including at least one processor, which executes a computer program or a logic circuit to make the processing apparatus perform the method in the above method embodiments. The processing apparatus can also include a memory for storing the computer program.

[0127] The present application also provides a processing apparatus, including a processor and an input / output interface. The input / output interface is coupled to the processor. The input / output interface is configured to input and / or output information. The information includes at least one of instructions and data. The processor is configured to execute a computer program to make the processing apparatus perform the method in the above method embodiments.

[0128] The present application also provides a processing apparatus, including a processor and a memory. The memory is configured to store a computer program, and the processor is configured to call and execute the computer program from the memory to make the processing apparatus perform the method in the above method embodiments.

[0129] It should be understood that the above processing apparatus can be one or more chips. For example, the processing apparatus can be a field programmable gate array (FPGA), can be an application specific integrated circuit (ASIC), can be a system on chip (SoC), can be a central processor unit (CPU), can be a network processor (NP), can be a digital signal processor (DSP), can be a micro controller unit (MCU), can be a programmable logic device (PLD), or can be other integrated chips.

[0130] In the implementation process, the steps of the above method can be completed by the integrated logic circuit of hardware in the processor or the instruction in the form of software. The steps of the method disclosed in combination with the embodiments of the present application can be directly embodied as hardware processor execution completion, or executed by the combination of hardware and software modules in the processor. The software module can be located in the mature storage medium in the field, such as random access memory, flash memory, read-only memory, programmable read-only memory, electrically erasable programmable memory, register, etc. The storage medium is located in the memory, and the processor reads the information in the memory, and combines the hardware to complete the steps of the above method. To avoid repetition, it will not be described in detail here.

[0131] It should be noted that the processor in the embodiments of the present application can be an integrated circuit chip with signal processing capability. In the implementation process, the steps of the above method embodiments can be completed by the integrated logic circuit of hardware in the processor or the instruction in the form of software. The above processor 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 combination with the embodiments of the present application can be directly embodied as hardware decoding processor execution completion, or executed by the combination of hardware and software modules in the decoding processor. The software module can be located in the mature storage medium in the field, such as random access memory, flash memory, read-only memory, programmable read-only memory, electrically erasable programmable memory, register, etc. The storage medium is located in the memory, and the processor reads the information in the memory, and combines the hardware to complete the steps of the above method.

[0132] It is to be appreciated that the memory in the embodiments of the application can be a volatile or non-volatile memory, or can include both volatile and non-volatile memory. The non-volatile memory can be read-only memory (ROM), programmable ROM (PROM), erasable PROM (EPROM), electrically EPROM (EEPROM), or flash memory. The volatile memory can be random access memory (RAM), which is used as external cache. By way of example, and not limitation, many forms of RAM are available, for example, static RAM (SRAM), dynamic RAM (DRAM), synchronous dynamic RAM (SDRAM), double data rate SDRAM (DDR SDRAM), enhanced SDRAM (ESDRAM), Synchlink DRAM (SLDRAM), and direct rambus RAM (DR RAM). It is to be appreciated that the memory described herein is intended to include, without being limited to, these and any other suitable types of memory.

[0133] According to the method provided in the embodiments of the application, the application further provides a computer program product, which comprises a computer program or a set of instructions, and when the computer program or the set of instructions run on a computer, the computer program or the set of instructions enable the computer to perform the method in the method embodiments.

[0134] According to the method provided in the embodiments of the application, the application further provides a computer readable storage medium, which stores a program, and when the program runs on a computer, the program enables the computer to perform the method in the method embodiments.

[0135] According to the method provided in the embodiments of the application, the application further provides a communication system, which can comprise the full-duplex communication device described above.

[0136] As used in this description, the terms "component," "module," "system", and the like are intended to refer to a computer-related entity, either hardware, firmware, a combination of hardware and software, software, or software in execution. For example, a component can be, but is not limited to being, a process running on a processor, a processor, an object, an executable, a thread of execution, a program, and / or a computer. By way of illustration, both an application running on a computing device and the computing device can be a component. One or more components can reside within a process and / or thread of execution and a component can be localized, partially localized, and / or distributed across two or more computers. Also, these components can execute from various computer readable media having various data structures stored thereon. The components can communicate by way of local and / or remote processes such as in accordance with a signal having one or more data packets (e.g., data from one component interacting with another component in a local system, distributed system, and / or across a network such as the Internet with other systems via the signal).

[0137] Those skilled in the art can realize that the units and algorithm steps of each example described in connection with the embodiments disclosed herein can be realized in electronic hardware, or a combination of computer software and electronic hardware. Whether the functions are performed in hardware or software depends on the specific application and design constraints. Those skilled in the art can realize the functions described in each example using different methods for each specific application. However, the disclosure should not be construed as limited to the described embodiments, but instead includes all modifications, equivalents, and alternatives falling within the scope of the appended claims.

Claims

1. A full-duplex communication apparatus, characterized by comprising: Comprise: a first sending unit, a first self-interference cancellation component and a first receiving unit, wherein the first self-interference cancellation component comprises a first electro-optical conversion unit, a first directional coupler, K1 first interference analog units, a second directional coupler and a first opto-electric conversion unit, K1 is an integer greater than 1; The input end of the first self-interference cancellation component is connected between the output end of the first sending unit and the first sending antenna, and the output end of the first self-interference cancellation component is connected between the input end of the first receiving unit and the first receiving antenna; The first sending unit is used for outputting a first signal to the first self-interference cancellation component and the first sending antenna; The first electro-optical conversion unit is used for converting the first signal into a first optical signal; The first directional coupler is used for splitting the first optical signal to obtain K1 sub-signals, and the K1 sub-signals correspond to the K1 first interference analog units one by one; Each of the K1 first interference analog units is used for signal modulation on the corresponding sub-signal, and the frequencies of the modulated sub-signals output by different first interference analog units in the K1 first interference analog units are different; The second directional coupler is used for combining the K1 modulated sub-signals to obtain a second optical signal; The first opto-electric conversion unit is used for opto-electric conversion based on the second optical signal to obtain a first cancellation signal, and outputs the first cancellation signal to the first receiving unit; The first receiving unit is used for self-interference cancellation on a second signal received through the first receiving antenna based on the first cancellation signal.

2. The apparatus of claim 1, wherein, The K1 first interference analog units comprise a first interference analog unit A1 for modulating a first sub-signal and a first interference analog unit A2 for modulating a second sub-signal; The first interference analog unit A1 comprises a frequency shifter for modulating the first sub-signal to a first frequency, and the first frequency is different from the frequency of the second sub-signal modulated by the first interference analog unit A2.

3. The apparatus of claim 2, wherein, The first interference analog unit A2 comprises a frequency shifter for modulating the second sub-signal to a second frequency.

4. The device of any one of claims 1 to 3, wherein, Each of the K1 first interference analog units comprises an optical delay device and / or an optical attenuator.

5. The device of any one of claims 1 to 4, wherein, Further comprise: a second sending unit and a second self-interference cancellation component, wherein the second self-interference cancellation component comprises a second electro-optical conversion unit, a third directional coupler, K2 second interference analog units, a fourth directional coupler and the first opto-electric conversion unit, K2 is an integer greater than 1; The input end of the second self-interference cancellation component is connected between the output end of the second sending unit and the second sending antenna, and the output end of the second self-interference cancellation component is connected between the input end of the first receiving unit and the first receiving antenna; The second sending unit is used for outputting a third signal to the second self-interference cancellation component and the second sending antenna; The second electro-optical conversion unit is used for converting the third signal into a third optical signal; The third directional coupler is configured to split the third optical signal into K2 sub-signals, the K2 sub-signals corresponding to the K2 second interference analog units one by one; Each of the K2 second interference analog units is configured to modulate a corresponding sub-signal; The fourth directional coupler is configured to combine the K2 modulated sub-signals to obtain a fourth optical signal; The first photoelectric conversion unit is specifically configured to perform photoelectric conversion based on the fourth optical signal and the second optical signal to obtain the first cancellation signal, and output the first cancellation signal to the first receiving unit; The first receiving unit is configured to perform self-interference cancellation on a second signal received by the first receiving antenna based on the first cancellation signal.

6. The apparatus of claim 5, wherein, The third optical signal converted by the second electro-optical conversion unit and the second optical signal converted by the first electro-optical conversion unit are different in wavelength.

7. The device of any one of claims 1 to 6, wherein, Further comprising: A second receiving unit and a third self-interference cancellation assembly, wherein the third self-interference cancellation assembly comprises the first electro-optical conversion unit, a fifth directional coupler, K3 third interference analog units, a sixth directional coupler, and a third photoelectric conversion unit, K3 being an integer greater than 1; An input end of the third self-interference cancellation assembly is connected between an output end of the first sending unit and the first sending antenna, and an output end of the third self-interference cancellation assembly is connected between an input end of the second receiving unit and a second receiving antenna; The first sending unit outputs the first signal to the third self-interference cancellation assembly and the first sending antenna; The first electro-optical conversion unit is specifically configured to convert the first signal into a fifth optical signal, the fifth optical signal being split into the first optical signal and a sixth optical signal; The fifth directional coupler is configured to split the sixth optical signal into K3 sub-signals, the K3 sub-signals corresponding to the K3 third interference analog units one by one; Each of the K3 third interference analog units is configured to modulate a corresponding sub-signal; The sixth directional coupler is configured to combine the K3 modulated sub-signals to obtain a seventh optical signal; The third photoelectric conversion unit is configured to perform photoelectric conversion based on the seventh optical signal to obtain a second cancellation signal, and output the second cancellation signal to the second receiving unit; The second receiving unit is configured to perform self-interference cancellation on a fourth signal received by the second receiving antenna based on the second cancellation signal.

8. A full-duplex communication method characterized by, Applied to a communication device, the communication device comprising a first sending unit and a first receiving unit, the method comprising: Performing electro-optical conversion on a first signal to obtain a first optical signal, the first signal being a signal output by the first sending unit to a first sending antenna; Modulating K1 sub-signals obtained by splitting the first optical signal to obtain a second optical signal, the second optical signal being obtained by combining K1 modulated sub-signals, the K1 modulated sub-signals being different in frequency, K1 being an integer greater than 1; Performing photoelectric conversion on the second optical signal to obtain a first cancellation signal; Based on the first cancellation signal, performing self-interference cancellation on a second signal received by the first receiving unit through a second receiving antenna.

9. The method of claim 8, wherein, The modulating the K1 sub-signals obtained by splitting the first optical signal comprises: The frequency, amplitude and / or time delay of each of the K1 sub-signals are modulated.

10. A communications device, characterized by The method comprises: The processor is configured to execute computer instructions stored in the memory, so that the apparatus performs the method of claim 8 or 9.

11. A communication system, characterized by The method comprises: The full-duplex communication apparatus of any one of claims 1 to 7.

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