Communication device, interference cancellation apparatus, interference cancellation method, and communication system

Abstract

A communication device, an interference cancellation apparatus, an interference cancellation method, and a communication system, which relate to the technical field of communications. The communication device comprises a combiner, a first signal processing module and a second signal processing module. An input port of the combiner inputs a first signal, a second signal and a fourth signal, wherein a reception time of the first signal is subsequent to a reception time of the third signal, the second signal is a signal finally output after signal processing is performed on the third signal, the fourth signal is an out-of-phase signal of the second signal, and the first signal, the second signal, the third signal and the fourth signal are analog signals. The first signal processing module performs signal processing on the third signal to output a fifth signal, the second signal is a signal obtained after signal processing is performed on the fifth signal, the fifth signal is a digital signal, and the second signal processing module performs signal processing on the fifth signal to output the fourth signal. By using a fourth signal to cancel a second signal, the capability of a communication device to resist self-excited interference can be improved.

Description

Communication device, interference cancellation device, interference cancellation method and communication system

[0001] This application claims priority to the Chinese patent application No. 202411374457.9, filed on September 27, 2024, entitled “Communication device, interference cancellation device, interference cancellation method and communication system”, 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, more particularly, to a communication device, an interference cancellation device, an interference cancellation method and a communication system. BACKGROUND

[0003] A repeater can amplify the power of the radio frequency signal transmitted by the base station to establish a new coverage area, which can achieve effective expansion of the coverage of the base station, thereby meeting the low-capacity coverage needs of remote areas such as rural areas.

[0004] Since the repeater is a same-frequency signal repeating device, when the isolation between the backhaul antenna and the access antenna of the repeater is insufficient, the backhaul antenna will receive both the low-power signal transmitted by the base station and the high-power signal transmitted by the access antenna. Since the high-power signal and the low-power signal are same-frequency signals, the high-power signal will interfere with the low-power signal, which may cause self-excitation interference of the repeater, and thus may cause the repeater to malfunction.

[0005] Currently, the probability of self-excitation interference of the repeater can be reduced by reducing the transmission level of the repeater or improving the reception level of the repeater, however, the above solutions may cause a decrease in the ease of use of the scenario of the repeater, for example, reducing the transmission level of the repeater will reduce the coverage radius of the repeater, and improving the reception level of the repeater will shorten the backhaul distance between the repeater and the base station. Therefore, how to improve the anti-self-excitation interference capability of the repeater is a technical problem to be solved at present. SUMMARY

[0006] The present application provides a communication device, an interference cancellation device, an interference cancellation method and a communication system, which can improve the anti-self-excitation interference capability of the communication device.

[0007] In a first aspect, a communication device is provided, which includes a first combiner, a first signal processing module, and a second signal processing module. The first combiner includes a first input port and a second input port. The first input port is configured to input a first signal and a second signal. The first signal is received after a third signal. The second signal is a signal processed from the third signal and finally output. The second input port is configured to input a fourth signal. The fourth signal is an in-phase signal of the second signal. The first signal, the second signal, the third signal, and the fourth signal are analog signals. An output port of the first combiner is connected to an input port of the first signal processing module. An output port of the first signal processing module is connected to an input port of the second signal processing module. An output port of the second signal processing module is connected to the second input port. The first signal processing module is configured to process the third signal input by the first combiner and output a fifth signal. The second signal is a signal processed from the fifth signal. The fifth signal is a digital signal. The second signal processing module is configured to process the fifth signal and output the fourth signal.

[0008] In the above structure, the second signal processing module outputs the fourth signal for canceling the second signal to the combiner. In this way, when the combiner receives the first signal, the second signal, and the fourth signal, the combiner can use the fourth signal to cancel the second signal, thereby reducing the transmission interference of the second signal on the first signal, and further improving the anti-self-excitation interference capability of the communication device.

[0009] In summary, by setting the second signal processing module, the signal transmitted by the communication device at the previous time (e.g., the transmission time of the second signal) will not cause great interference to the transmission of the signal transmitted by the base station received by the communication device at the next time (e.g., the reception time of the first signal), thereby improving the anti-self-excitation interference capability of the communication device.

[0010] In some implementations of the first aspect, the communication device further comprises: a second combiner, a third signal processing module, and a fourth signal processing module. The second combiner comprises a third input port and a fourth input port, the third input port is configured to input a sixth signal, the sixth signal comprises the second signal and a noise signal, the noise signal is a signal formed when the fifth signal is subjected to signal amplification processing, the fourth input port is configured to input a seventh signal, the seventh signal is a quadrature signal of the noise signal; the output port of the first signal processing module is connected to the input port of the third signal processing module and the input port of the fourth signal processing module respectively, the output port of the third signal processing module is connected to the third input port, and the output port of the fourth signal processing module is connected to the fourth input port; the third signal processing module is configured to perform signal amplification processing on the input fifth signal and output the sixth signal; the fourth signal processing module is configured to perform signal processing on the input fifth signal and output the seventh signal; and the second combiner is configured to perform combing processing on the sixth signal and the seventh signal and output the second signal.

[0011] In the above structure, the fourth signal processing module can output a signal for canceling the noise signal to the combiner. When the combiner receives the sixth signal and the seventh signal, the combiner can perform canceling processing on the noise signal in the sixth signal through the seventh signal, which can enhance the anti-noise interference capability of the communication device.

[0012] In summary, through the fourth signal processing module, this can support enhancing the anti-noise interference capability of the communication device.

[0013] In some implementations of the first aspect, the second signal processing module comprises a signal delay unit, and the input port of the signal delay unit is connected to the output port of the first signal processing module.

[0014] In the above structure, the signal delay unit can be used to delay the input signal. In this way, this can support enhancing the canceling effect of the fourth signal on the second signal.

[0015] In some implementations of the first aspect, the signal delay unit is configured to make the time interval between the time when the fourth signal reaches the second input port and the time when the second signal reaches the first input port less than or equal to a threshold value.

[0016] In this way, this can support keeping the time when the fourth signal reaches the second input port of the first combiner consistent with the time when the second signal reaches the first input port of the first combiner, and in turn can support keeping the fourth signal and the second signal time-delay aligned, which can support enhancing the canceling effect of the fourth signal on the second signal.

[0017] In a second aspect, an interference cancellation apparatus is provided, comprising: a signal input unit and a signal output unit. The signal input unit is configured to input a digital signal; and the signal output unit is configured to output an in-phase signal of an air interface signal, the air interface signal being a signal formed when the digital signal is transmitted over an air interface, and the in-phase signal of the air interface signal being an analog signal.

[0018] For details, reference can be made to the foregoing description.

[0019] In some implementations of the second aspect, the interference cancellation apparatus further comprises a signal delay unit, an output port of the signal delay unit being connected to an input port of the signal input unit, and the digital signal is a signal obtained after delay processing of the signal delay unit.

[0020] In a third aspect, an interference cancellation apparatus is provided, comprising: a signal input unit and a signal output unit. The signal input unit is configured to input a digital signal; and the signal output unit is configured to output an in-phase signal of a noise signal, the noise signal being a signal formed when the digital signal is subjected to signal amplification processing, and the in-phase signal of the noise signal being an analog signal.

[0021] For details, reference can be made to the foregoing description.

[0022] In a fourth aspect, an interference cancellation method is provided, comprising: a first signal processing module performing signal processing on a third signal input by a first combiner to obtain a fifth signal, the fifth signal being a digital signal; a second signal processing module performing signal processing on the fifth signal and outputting a fourth signal to the first combiner, the fourth signal being an in-phase signal of a second signal, the second signal and the third signal both being analog signals, and the second signal being a signal obtained after processing of the third signal and final output; the first combiner performing combiner processing on a first signal, the second signal, and the fourth signal input by the first combiner, and outputting a signal obtained after the combiner processing, a receiving time of the first signal being after a receiving time of the third signal.

[0023] For details, reference can be made to the foregoing description.

[0024] In some implementations of the fourth aspect, the method further comprises: a third signal processing module performing signal amplification processing on the fifth signal to output a sixth signal, the sixth signal comprising the second signal and a noise signal, the noise signal being a signal formed when the fifth signal is subjected to signal amplification processing; a fourth signal processing module performing signal processing on the fifth signal to output a seventh signal, the seventh signal being an in-phase signal of the noise signal; and a second combiner performing combiner processing on the sixth signal and the seventh signal to output the second signal.

[0025] For details, reference can be made to the foregoing description.

[0026] In some implementations of the fourth aspect, the second signal processing module performs signal processing on the fifth signal to output the fourth signal, including: performing delay processing on the fifth signal, and outputting the fifth signal after the delay processing; performing signal processing on the fifth signal after the delay processing, and outputting the fourth signal.

[0027] For details, refer to the foregoing description, which will not be repeated here.

[0028] In a fifth aspect, a communication system is provided, including: a base station and the communication device of the first aspect and any possible implementation of the first aspect, which is configured to transmit a signal from the base station.

[0029] For example, the base station transmits a first signal to the communication device, and the communication device performs signal processing on the first signal and transmits a signal obtained based on the signal processing on the first signal to the terminal. BRIEF DESCRIPTION OF DRAWINGS

[0030] FIG. 1 is a structural schematic diagram of a repeater.

[0031] FIG. 2 is a structural schematic diagram of a communication device according to an embodiment of the present application.

[0032] FIG. 3 is another structural schematic diagram of a communication device according to an embodiment of the present application.

[0033] FIG. 4 is yet another structural schematic diagram of a communication device according to an embodiment of the present application.

[0034] FIG. 5 is a structural schematic diagram of an interference cancellation device according to an embodiment of the present application.

[0035] FIG. 6 is another structural schematic diagram of an interference cancellation device according to an embodiment of the present application.

[0036] FIG. 7 is yet another structural schematic diagram of an interference cancellation device according to an embodiment of the present application.

[0037] FIG. 8 is a structural schematic diagram of a communication system according to an embodiment of the present application.

[0038] FIG. 9 is an interactive flowchart of a communication method according to an embodiment of the present application. DETAILED DESCRIPTION

[0039] In order to facilitate understanding of the embodiments of the present application, the following points are first explained.

[0040] I. If there is no special description and logical conflict, the terms and / or descriptions of different embodiments of the present application are consistent and can be mutually referenced. The technical features in different embodiments can be combined to form new embodiments according to their inherent logical relationship.

[0041] Second, various digital numbers involved in the present application are only used for distinguishing, and do not limit the protection scope of the present application. The sequence number size involved in the present application does not mean the execution sequence, and the execution sequence of each process should be determined according to its function and inherent logic. For example, the terms "first", "second", "third", "fourth" and other various term labels in the specification and claims of the present application and the drawings (if any) are used to distinguish similar objects, and do not have to be used to describe a specific sequence or order. Among them, the data thus used can be interchanged under appropriate circumstances, so that the embodiments described herein can be implemented in an order other than that illustrated or described herein.

[0042] Meanwhile, any embodiment or design scheme described as "exemplarily" or "for example" in the present application should not be interpreted as more preferred or more advantageous than other embodiments or design schemes. Rather, the words "exemplarily" or "for example" are intended to present the relevant concept in a specific manner, for the convenience of understanding.

[0043] Third, the terms "comprise" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device comprising a series of steps or units does not have to be limited to those steps or units clearly listed, but can include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0044] The communication device, interference cancellation device, interference cancellation method and communication system of the embodiments of the present application are described below.

[0045] The communication device, interference cancellation apparatus, interference cancellation method and communication system of the embodiments of the present application can be applied to various communication systems, including but not limited to: a long term evolution (LTE) system, an LTE frequency division duplex (FDD) system, an LTE time division duplex (TDD) system, a universal mobile telecommunication system (UMTS), a worldwide interoperability for microwave access (WiMAX) system, a wideband code division multiple access (WCDMA) system, a global system for mobile communications (GSM) system, a code division multiple access (CDMA) system, a fifth generation (5G) communication system, a device to device (D2D) system, a vehicle to everything (V2X) system or a future communication network, etc. th

[0046] First, the terms involved in the present application are briefly introduced.

[0047] 1. Repeater

[0048] A repeater is a device that can be used for bidirectional forwarding of wireless signals between two network nodes (for example, one network node is a terminal and the other network node is a base station). Generally, a repeater is composed of a backhaul antenna, an access antenna, a radio frequency duplexer, a low noise amplifier, a mixer, an electrically adjustable attenuator, a filter, a power amplifier and other components.

[0049] The working principle of a repeater is as follows: the downlink signal transmitted by the base station is received by the backhaul antenna, the useful signal in the downlink signal is amplified by the low noise amplifier, and the noise signal in the signal is suppressed, then the signal is down-converted to an intermediate frequency signal, filtered by the filter, amplified by the intermediate frequency amplifier, up-converted to a radio frequency signal, amplified by the power amplifier, and finally transmitted to the terminal by the access antenna. At the same time, the repeater can also receive the uplink signal transmitted by the terminal using the access antenna, and process the signal along the opposite path by the uplink amplification link: that is, the signal is amplified by the low noise amplifier, down-converted by the down-converter, filtered by the filter, amplified by the intermediate frequency amplifier, up-converted by the up-converter, amplified by the power amplifier, and then transmitted to the base station, thereby realizing bidirectional communication between the base station and the terminal.​

[0050] FIG. 1 is a structural schematic diagram of a repeater. As shown in FIG. 1, the repeater includes a backhaul antenna 110, an analog down-conversion module 120, a digital processing module 130, an analog up-conversion module 140, and an access antenna 150. The digital processing module 130 mainly includes an analog-to-digital converter (ADC), a digital down converter (DDC) module, a digital up converter (DUC) module, and a digital-to-analog converter (DAC) connected in sequence.

[0051] As known from the background, there is a coupling effect between the backhaul antenna 110 and the access antenna 150, which can cause the repeater to generate self-excitation interference, and thus can cause the repeater to fail to work normally.

[0052] Taking FIG. 1 as an example, due to the coupling effect between the backhaul antenna 110 and the access antenna 150, the backhaul antenna 110 receives the signal 3 transmitted by the base station and the signal 2 transmitted by the access antenna 150 at time 2 (the transmission time of the signal 2 is time 3, which is before time 2). The signal 2 is a signal obtained by the repeater performing signal processing on the signal 1 transmitted by the base station received by the backhaul antenna 110 at time 1 (the transmission time of the signal 2 is after time 1), which is before time 2. The signal 2 is a same-frequency signal of the signal 3, the power of the signal 2 is greater than that of the signal 3, and the signal 2 can cause interference to the signal 3, which can cause the repeater to generate self-excitation interference. Or, the signal transmitted by the access antenna 150 at time 3 can cause interference to the transmission of the signal received by the backhaul antenna 110 at time 2.

[0053] Therefore, the present application provides a communication device, an interference cancellation device, an interference cancellation method, and a communication system, which can support improving the anti-self-excitation interference capability of the communication device. For details, please refer to FIG. 2.

[0054] Fig. 2 is a schematic diagram of a communication device according to an embodiment of the present application. The communication device shown in Fig. 2 can be a repeater, a relay device, a network device in wireless fidelity (Wi-Fi), a terminal, or the like. Alternatively, the communication device shown in Fig. 2 can be a device for in-band signal relay or inter-band signal relay. As shown in Fig. 2, the communication device includes a backhaul antenna 210, a combiner 220, a signal processing module 230, a signal processing module 240, a signal processing module 250, and an access antenna 260. The communication device shown in Fig. 2 can be used in a downlink transmission scenario or an uplink transmission scenario.

[0055] The combiner 220 is a device for combining two or more radio frequency signals into one. The combiner 220 includes an input port 1, an input port 2, and an output port 3. The input port 1 is connected to the backhaul antenna 210 and is configured to input signals received by the backhaul antenna 210, such as a first signal A1, a second signal A2, and a third signal A3. The input port 2 is connected to the signal processing module 240 and is configured to input a signal output by the signal processing module 240, such as a fourth signal A4. The output port 3 is connected to an input port of the signal processing module 230 and is configured to output a combined signal to the signal processing module 230. An output port of the signal processing module 230 is connected to an input port of the signal processing module 240 and an input port of the signal processing module 250. An output port of the signal processing module 250 is connected to the access antenna 260, and the access antenna 260 is configured to transmit a signal output by the signal processing module 250, such as the second signal A2.

[0056] It should be understood that the schematic diagram shown in Fig. 2 is only an example and is not limiting.

[0057] The signal processing module 240 is configured to output a cancellation signal for cancelling a signal transmitted by the access antenna 260.

[0058] In one example, the signal processing module 230 is configured to perform signal processing (e.g., digital filtering, gain control, etc.) on the signal A3 inputted to the combiner 220 (the signal A3 is transmitted by the base station to the communication device) and output a signal A5 (as a fifth signal), the signal A5 is a digital signal, the signal A2 is a signal outputted by performing signal processing on the signal A3, and the signal A3 is an analog signal. The signal processing module 240 performs signal processing (e.g., digital filtering, gain control, etc.) on the signal A5 outputted by the signal processing module 230 to obtain a signal A4, and the signal A4 is an analog signal. The signal A4 is a quadrature signal of the signal A2, and the signal A2 is a signal transmitted over the air. The signal A4 is the aforementioned cancellation signal, and the signal A4 is used to cancel the signal A2. It should be noted that the transmission time of the signal A3 corresponding to the signal A2 is before the transmission time of the signal A1 (the signal A1 is transmitted by the base station to the communication device).

[0059] In the embodiments of the present application, the quadrature can be that the phase difference between the two signals is 180°, for example, the phase difference between the phase of the signal A4 and the phase of the signal A2 is 180°. In addition, the amplitude of the signal A4 can be the same as the amplitude of the signal A2, that is, the signal A4 is an equal-amplitude quadrature signal of the signal A2; the amplitude of the signal A4 can be different from the amplitude of the signal A2, that is, the signal A4 is a non-equal-amplitude but quadrature signal of the signal A2. In this way, the transmission interference of the signal A2 on the signal transmitted by the base station and received by the backhaul antenna 210 can be reduced.

[0060] For example, the access antenna 260 transmits the signal A2 at time T2, the base station transmits the signal A1 to the backhaul antenna 210 at time T3, the input port 1 of the combiner 220 receives the signal A1 and the signal A2, the time T2 is before the time T3, and the input port 2 of the combiner 220 receives the signal A4. The signal A2 is a signal obtained by the signal processing module 250 according to the signal A3. The signal A4 is a signal obtained by the signal processing module 240 performing signal processing (e.g., digital filtering, gain control, etc.) on the signal A5. The combiner 220 can output (signal A1 + signal A2 + signal A4) to the signal processing module 230. When the signal A4 can completely cancel the signal A2, the signal outputted by the combiner 220 to the signal processing module 230 is the signal A1. When the signal A4 partially cancels the signal A2, the signal outputted by the combiner 220 to the signal processing module 230 is: signal A1 + signal Δ1 (signal Δ1 = the difference between the signal A2 and the signal A4). In the above two cases, the interference of the signal A2 on the signal A1 can be reduced.

[0061] In summary, through the signal processing module 240, this can support enhancing the anti-self-excitation interference capability of the communication device. In other words, through the signal processing module 240, the signal transmitted by the communication device at the previous time (such as the transmission time of the signal A2) will not cause great interference to the transmission of the signal transmitted by the base station received by the communication device at the next time (such as the reception time of the signal A1).

[0062] In some embodiments, the signal processing module 240 can include an adaptive filter and a DAC and the like devices or modules.

[0063] In some embodiments, the signal processing module 230 can include an ADC, a gain control device, and a signal delay device and the like devices.

[0064] In some embodiments, the signal processing module 250 can include a DAC, a small-signal amplifier device, a power amplifier, and a signal delay device and the like devices.

[0065] FIG. 3 is another structural schematic diagram of a communication device according to an embodiment of the present application. As shown in FIG. 3, the communication device includes a backhaul antenna 210, a combiner 220, a signal processing module 230, a signal processing module 240, a signal processing module 250, and an access antenna 260. The signal processing module 240 includes a signal delay unit 2401.

[0066] The input port of the signal delay unit 2401 is connected with the output port of the signal processing module 230.

[0067] The signal delay unit 2401 can be used for delaying the input signal. In this way, this can support keeping the time when the signal A4 reaches the second input port of the combiner 220 consistent with the time when the signal A2 reaches the first input port of the combiner 220, thereby being able to support keeping the time delay of the signal A4 and the signal A2 aligned.

[0068] In summary, through the signal delay unit 2401, this can support enhancing the cancellation effect of the signal A4 on the signal A2.

[0069] In some embodiments, the signal delay unit 2401 is used to make the time interval between the time when the signal A4 reaches the second input port and the time when the signal A2 reaches the first input port less than or equal to a threshold value. In this way, this can support keeping the time when the signal A4 reaches the second input port of the combiner 220 consistent with the time when the signal A2 reaches the first input port of the combiner 220, thereby being able to support keeping the time delay of the signal A4 and the signal A2 aligned, which can support enhancing the cancellation effect of the signal A4 on the signal A2.

[0070] Fig. 4 is another structure diagram of the communication device according to an embodiment of the present application. As shown in Fig. 4, the communication device comprises a backhaul antenna 210, a combiner 220, a signal processing module 230, a signal processing module 240, a signal processing module 250, an access antenna 260, a signal processing module 280 and a combiner 290.

[0071] The combiner 290 comprises an input port 4, an input port 5 and an output port 6. The input port 4 is connected to the output port of the signal processing module 250, for inputting the signal output by the signal processing module 250. The input port 5 is connected to the output port of the signal processing module 280, for inputting the signal output by the signal processing module 280. The output port 6 is connected to the access antenna 260, for transmitting the signal which needs to be transmitted through the air interface to the access antenna 260. The input port of the signal processing module 280 is connected to the output port of the signal processing module 230, and the signal processing module 280 can perform signal processing on the signal from the signal processing module 230.

[0072] The signal processing module 280 can output a cancellation signal which can cancel the noise signal in the signal output by the signal processing module 250.

[0073] For example, the signal processing module 250 is configured to perform signal processing on the input signal A5 and output a signal A6 (e.g., a sixth signal), and the signal A6 comprises the signal A2 and a noise signal. The signal processing module 280 is configured to perform signal processing on the input signal A5 and output a signal A7 (e.g., a seventh signal), and the signal A7 is an anti-phase signal of the noise signal. The signal A7 can cancel the noise signal in the signal A6. In addition, the amplitude of the signal A7 can be equal to the amplitude of the noise signal, i.e., the signal A7 is an equal-amplitude anti-phase signal of the noise signal; or the amplitude of the signal A7 can be different from the amplitude of the noise signal, i.e., the signal A7 is a non-equal-amplitude anti-phase signal of the noise signal. In this way, the interference of the noise signal can be reduced.

[0074] For example, the input port 4 of the combiner 290 receives the signal A6, and the input port 5 of the combiner 290 receives the signal A7. The combiner 290 can output (signal A7 + signal A2 + noise signal) to the access antenna 260. When the signal A7 can completely cancel the noise signal, the signal output by the combiner 290 to the access antenna 260 is the signal A2. When the signal A7 partially cancels the noise signal, the signal output by the combiner 290 to the access antenna 260 is: signal A2 + signal Δ2 (signal Δ2 = noise signal - signal A7). In the above two cases, the interference of the noise signal can be reduced.

[0075] In summary, through the signal processing module 280, the ability of the communication device to resist noise interference can be enhanced.

[0076] The interference elimination device of the embodiment of the present application is described below in combination with FIG. 5 and FIG. 6.

[0077] FIG. 5 is a structural schematic diagram of an interference elimination device of an embodiment of the present application. As shown in FIG. 5, the interference elimination device comprises a signal input unit 1 and a signal output unit 2. The signal input unit 1 is configured to input a digital signal 1. The signal output unit 2 is configured to output an in-phase signal of an air interface signal 1, the air interface signal 1 being a signal formed when the digital signal 1 is transmitted over an air interface, and the in-phase signal of the air interface signal 1 being an analog signal.

[0078] When the interference elimination device shown in FIG. 5 is applied to FIG. 2, the interference elimination device shown in FIG. 5 is the signal processing module 240 shown in FIG. 2. For example, the signal processing module 240 comprises the signal input unit 1 and the signal output unit 2. Correspondingly, the digital signal 1 is the signal A5, the in-phase signal of the air interface signal 1 is the signal A4, and the air interface signal 1 is the signal A2.

[0079] FIG. 6 is another structural schematic diagram of an interference elimination device of an embodiment of the present application. As shown in FIG. 6, the interference elimination device comprises a signal input unit 1, a signal output unit 2, and a signal delay unit 1. The signal input unit 1 is configured to input a digital signal 1. The signal output unit 2 is configured to output an in-phase signal of an air interface signal 1, the air interface signal 1 being a signal formed when the digital signal 1 is transmitted over an air interface, and the in-phase signal of the air interface signal 1 being an analog signal. An output port of the signal delay unit 1 is connected to an input port of the signal input unit 1, and is configured to output a signal subjected to signal delay processing to the signal input unit 1. For example, the signal input unit 1 is configured to input a digital signal 1 subjected to signal delay processing.

[0080] When the interference elimination device shown in FIG. 6 is applied to FIG. 3, the interference elimination device shown in FIG. 6 is the signal processing module 240 shown in FIG. 3. Correspondingly, the digital signal 1 is the signal A5, the air interface signal 1 is the signal A2, and the in-phase signal of the air interface signal 1 is the signal A4.

[0081] FIG. 7 is still another structural schematic diagram of an interference elimination device of an embodiment of the present application. As shown in FIG. 7, the interference elimination device comprises a signal input unit 3 and a signal output unit 4. The signal input unit 3 is configured to input a digital signal 1. The signal output unit 2 is configured to output an in-phase signal of a noise signal, the noise signal being a signal formed when the digital signal 1 is subjected to signal amplification processing, and the in-phase signal of the noise signal being an analog signal.

[0082] When the interference cancellation apparatus shown in Fig. 7 is applied to the communication device shown in Fig. 4, the interference cancellation apparatus shown in Fig. 7 can be the signal processing module 280 shown in Fig. 4. For example, the signal processing module 280 comprises the signal input unit 3 and the signal output unit 4. Correspondingly, the digital signal 1 is the signal A4, and the noise signal quadrature signal is the signal A7.

[0083] It should be noted that the embodiments of the present application do not limit the specific deployment of the interference cancellation apparatus shown in Figs. 5 to 7.

[0084] The communication system of the embodiments of the present application is described below in conjunction with Fig. 8.

[0085] Fig. 8 is a structural schematic diagram of a communication system according to an embodiment of the present application. As shown in Fig. 8, the communication system comprises a communication device and a base station. The communication device is configured to transmit a signal sent from the base station. The communication device can be the communication device shown in Figs. 2 to 4.

[0086] For example, the base station sends the signal A1 to the communication device, and the communication device performs signal processing on the signal A1 and sends a signal obtained by performing signal processing on the signal A1 to the terminal.

[0087] The interference cancellation method according to an embodiment of the present application is described below in conjunction with Fig. 9.

[0088] Fig. 9 is an interactive flowchart of an interference cancellation method according to an embodiment of the present application. The method shown in Fig. 9 is applied to the communication device described above. The method shown in Fig. 9 can be used in both downlink transmission scenarios and uplink transmission scenarios. As shown in Fig. 9, the method comprises the following steps.

[0089] S901, the signal processing module 230 performs signal processing on the third signal input by the combiner 220 to obtain a fifth signal, and the fifth signal is a digital signal.

[0090] For example, the fifth signal is the signal A5, and the third signal is an analog signal.

[0091] S902, the signal processing module 240 performs signal processing on the fifth signal and outputs a fourth signal to the combiner 220, and the fourth signal is a quadrature signal of the second signal. The second signal and the third signal are both analog signals, and the second signal is obtained according to the fifth signal.

[0092] Specifically, the signal processing module 230 outputs the fifth signal to the signal processing module 240. The signal processing module 240 performs signal processing on the fifth signal to obtain the fourth signal and outputs the fourth signal to the combiner 220.

[0093] For example, the fourth signal is the signal A4, and the second signal is the signal A2.

[0094] S903, the combiner 220 performs combining processing on the input first signal, second signal and fourth signal, and outputs the combining-processed signal, the receiving time of the first signal being later than the receiving time of the third signal.

[0095] For example, the first signal is signal A1.

[0096] Through the above method, this can support reducing the interference of the second signal on the first signal.

[0097] In some embodiments, the above-mentioned signal processing on the fifth signal to output the fourth signal comprises:

[0098] delay processing on the fifth signal and outputting the delay-processed fifth signal;

[0099] signal processing on the delay-processed fifth signal and outputting the fourth signal.

[0100] In this way, this can support the time delay alignment between the fourth signal and the second signal.

[0101] Optionally, the method further comprises:

[0102] S904, the signal processing module 250 performs signal amplification processing on the fifth signal and outputs a sixth signal to the combiner 290, the sixth signal comprising the second signal and a noise signal, the noise signal being a signal formed when the signal amplification processing is performed on the fifth signal.

[0103] For example, the sixth signal is signal A6.

[0104] S905, the signal processing module 280 performs signal processing on the fifth signal and outputs a seventh signal to the combiner 290, the seventh signal being a heterodyne signal of the noise signal.

[0105] For example, the seventh signal is signal A7.

[0106] S906, the combiner 290 performs combining processing on the seventh signal and the sixth signal to output the second signal.

[0107] Through the above method, this can support reducing the interference of the noise signal.

[0108] It should be noted that the present embodiment does not limit the execution order of S901-S903 and S904-S906.

[0109] Those skilled in the art can clearly understand that the units of the examples described in combination with the embodiments disclosed herein can be implemented in electronic hardware or a combination of computer software and electronic hardware. Whether the functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of the present application.

[0110] Those skilled in the art can clearly understand that, for the convenience and brevity of the description, the specific working processes of the above-described system, device and unit can refer to the corresponding processes in the foregoing method embodiments, which will not be repeated here.

[0111] In the embodiments provided in the present application, it should be understood that the disclosed system, device and method can be implemented in other ways. For example, the base station device embodiments described above are only schematic, for example, the division of the modules is only a logical function division, and actual implementation can have another division manner, for example, a plurality of modules or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the coupling or direct coupling or communication connection between the shown or discussed modules can be indirect coupling or communication connection through some interface, device or module, and can be electrical, mechanical or other forms.

[0112] The modules described as separate components can or can not be physically separated, and the components shown as modules can or can not be physical modules, i.e. can be located in one place, or can be distributed on a plurality of network units. Some or all of the modules can be selected according to actual needs to achieve the purpose of the embodiments.

[0113] In addition, each functional module in the embodiments of the present application can be integrated in one processing unit, or each module can exist physically, or two or more modules can be integrated in one module.

[0114] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto, and any skilled person in the art can easily think of changes or replacements within the technical scope disclosed in the present application, which should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A communication device, characterized by The communication device comprises: a first combiner, a first signal processing module and a second signal processing module; the first combiner comprises a first input port and a second input port, the first input port is configured to input a first signal and a second signal, the receiving time of the first signal is later than the receiving time of a third signal, the second signal is a signal obtained by performing signal processing on the third signal and finally output, the second input port is configured to input a fourth signal, the fourth signal is an in-phase signal of the second signal, and the first signal, the second signal, the third signal and the fourth signal are analog signals; an output port of the first combiner is connected with an input port of the first signal processing module, an output port of the first signal processing module is connected with an input port of the second signal processing module, and an output port of the second signal processing module is connected with the second input port; the first signal processing module is configured to perform signal processing on the third signal input by the first combiner and output a fifth signal, the second signal is a signal obtained by performing signal processing on the fifth signal, and the fifth signal is a digital signal; the second signal processing module is configured to perform signal processing on the fifth signal and output the fourth signal.

2. The communication device of claim 1, wherein, The communication device further comprises: a second combiner, a third signal processing module and a fourth signal processing module; the second combiner comprises a third input port and a fourth input port, the third input port is configured to input a sixth signal, the sixth signal comprises the second signal and a noise signal, the noise signal is a signal formed when signal amplification processing is performed on the fifth signal, and the fourth input port is configured to input a seventh signal, the seventh signal is an in-phase signal of the noise signal; an output port of the first signal processing module is connected with an input port of the third signal processing module and an input port of the fourth signal processing module respectively, an output port of the third signal processing module is connected with the third input port, and an output port of the fourth signal processing module is connected with the fourth input port; the third signal processing module is configured to perform signal amplification processing on the input fifth signal and output the sixth signal; the fourth signal processing module is configured to perform signal processing on the input fifth signal and output the seventh signal; the second combiner is configured to perform combing processing on the sixth signal and the seventh signal and output the second signal.

3. The communication device according to claim 1 or 2, characterized by The second signal processing module comprises a signal delay unit, an input port of the signal delay unit is connected with an output port of the first signal processing module.

4. The communication device of claim 3, wherein, The signal delay unit is configured to make a time interval between a time when the third signal reaches the second input port and a time when the second signal reaches the first input port less than or equal to a threshold value.

5. An interference cancellation apparatus, characterized by, The communication device comprises: a signal input unit and a signal output unit; the signal input unit is configured to input a digital signal; The signal output unit is configured to output an analog signal of an air interface signal, the air interface signal being a signal formed when the digital signal is transmitted over the air interface.

6. The interference cancellation apparatus of claim 5, wherein, The interference cancellation device further comprises: A signal delay unit, an output port of the signal delay unit being connected to an input port of the signal input unit, the digital signal being a signal obtained after delay processing of the signal delay unit.

7. An interference cancellation apparatus, characterized by, Comprise: A signal input unit and a signal output unit; The signal input unit is configured to input a digital signal; The signal output unit is configured to output an analog signal of a noise signal, the noise signal being a signal formed when the digital signal is subjected to signal amplification processing, the analog signal being an analog signal.

8. An interference cancellation method, characterized by, Comprise: The first signal processing module performs signal processing on a third signal input to a first combiner to obtain a fifth signal, the fifth signal being a digital signal; The second signal processing module performs signal processing on the fifth signal to obtain a fourth signal, and outputs the fourth signal to the first combiner, the fourth signal being an analog signal of a second signal, the second signal and the third signal both being analog signals, the second signal being a signal obtained after processing of the third signal and final output; The first combiner performs combiner processing on a first signal, the second signal and the fourth signal input thereto, and outputs a signal obtained after the combiner processing, a receiving time of the first signal being after a receiving time of the third signal.

9. The method of claim 8, wherein, The method further comprises: The third signal processing module performs signal amplification processing on the fifth signal to output a sixth signal, the sixth signal comprising the second signal and a noise signal, the noise signal being a signal formed when the fifth signal is subjected to signal amplification processing; The fourth signal processing module performs signal processing on the fifth signal to output a seventh signal, the seventh signal being an analog signal of the noise signal; The second combiner performs combiner processing on the sixth signal and the seventh signal to output the second signal.

10. The method according to claim 8 or 9, characterized in that, The second signal processing module performs signal processing on the fifth signal to output a fourth signal, comprising: delay processing on the fifth signal, and outputting the fifth signal obtained after the delay processing; signal processing on the fifth signal obtained after the delay processing, and outputting the fourth signal.

11. A communication system, characterized by The communication system comprises the communication device of any one of claims 1 to 4 and a base station, the communication device being configured to transmit the first signal from the base station.

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