Communication device, interference cancellation method, and communication system
By using a cancellation module in the communication device to generate out-of-phase signals for cancellation processing, the signal interference problem in the communication between outdoor base stations and indoor PIOT terminals in passive IoT is solved, improving communication quality and simplifying the hardware structure.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- HUAWEI TECH CO LTD
- Filing Date
- 2024-12-04
- Publication Date
- 2026-06-05
AI Technical Summary
In passive IoT, communication between outdoor base stations and indoor PIOT terminals is affected by signal interference, resulting in a decrease in communication performance.
By introducing a cancellation module into the communication equipment, the excitation signal and downlink signal are generated and used to cancel each other, reducing the interference of the excitation signal and downlink signal on the transmission of the data signal, simplifying the hardware structure, and directly performing signal amplification processing.
It effectively reduces the communication interference between the excitation signal and downlink signal on the base station and PIOT terminal, simplifies the hardware complexity and cost of communication equipment, and improves communication quality.
Smart Images
Figure CN122159972A_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of communication technology, and more specifically, to a communication device, an interference cancellation method, and a communication system. Background Technology
[0002] Passive Internet of Things (PIOT) is a type of Internet of Things (IoT) technology represented by backscatter communication. Due to its significant advantages in terms of terminal power consumption, terminal size, and hardware cost, it can be widely used in the field of asset management.
[0003] Because the PIOT terminal in a PIOT communication system has low power consumption, it cannot achieve long-distance communication with the base station. Therefore, in indoor communication scenarios, it is necessary to deploy independent small cells indoors to assist communication between the outdoor base station and the indoor PIOT terminal. For example, the small cell sends an excitation signal to the indoor PIOT terminal, the PIOT terminal responds to the excitation signal by sending an uplink data signal to the small cell, and the cellular base station then sends the uplink data signal to the outdoor base station.
[0004] The above-mentioned solution suffers from significant signal interference, which can affect communication between outdoor base stations and indoor PIOT terminals. Therefore, how to better facilitate communication between outdoor base stations and indoor PIOT terminals is a pressing technical problem that needs to be solved. Summary of the Invention
[0005] This application provides a communication device, an interference cancellation method, and a communication system that can better assist communication between outdoor base stations and indoor PIOT terminals.
[0006] In a first aspect, a communication device is provided, comprising: a communication module and a first cancellation module. The communication module is used to send an excitation signal to a PIOT terminal, the excitation signal being used to excite the PIOT terminal to send a first data signal, the frequency band of the excitation signal being the same as the frequency band of the first data signal; and to receive the excitation signal and the first data signal from the PIOT terminal; the first cancellation module is used to perform cancellation processing on the excitation signal, the first data signal, and an out-of-phase signal of the excitation signal to obtain a second data signal, the out-of-phase signal of the excitation signal being a signal generated by the first cancellation module; the communication module is also used to send the second data signal to a base station.
[0007] In the above structure, by generating and using out-of-phase signals to cancel out the excitation signal, interference from the excitation signal to the data signal transmission can be reduced, thereby better assisting communication between the base station and the PIOT terminal. Furthermore, because the interference from the excitation signal to the data signal transmission can be reduced, the communication equipment does not need to perform buffering of the data signal; it can only amplify the data signal and directly (without buffering) send the amplified data signal to the base station. This reduces the hardware complexity, cost, and deployment complexity of the communication equipment, as it eliminates the need for hardware that performs signal buffering.
[0008] In some implementations of the first aspect, the first cancellation module includes a first cancellation unit and a first processing unit. The first cancellation unit is used to perform phase processing on the excitation signal to obtain an out-of-phase signal of the excitation signal; the first processing unit is used to perform cancellation processing on the excitation signal, the out-of-phase signal of the excitation signal, and the first data signal to obtain a second data signal. Thus, based on the above structure, embodiments of this application support reducing the interference of the excitation signal on the transmission of the data signal, thereby better assisting the communication between the base station and the PIOT terminal.
[0009] In some implementations of the first aspect, the first cancellation module includes a first cancellation unit, a first processing unit, and a second cancellation unit. The first cancellation unit performs phase processing on the excitation signal to obtain an out-of-phase signal of the excitation signal; the first processing unit performs cancellation processing on the excitation signal, the out-of-phase signal of the excitation signal, and the first data signal to obtain a first data signal and a residual signal, wherein the residual signal is the signal obtained after cancelling the excitation signal with the out-of-phase signal of the excitation signal; the second cancellation unit performs cancellation processing on the first data signal, the residual signal, and the out-of-phase signal of the residual signal to obtain a second data signal, wherein the out-of-phase signal of the residual signal is the signal obtained by phase processing the first signal, and the excitation signal is the signal obtained based on the first signal. Thus, based on the above structure, embodiments of this application support reducing interference of the excitation signal on the transmission of the data signal, thereby better assisting communication between the base station and the PIOT terminal.
[0010] In some implementations of the first aspect, the communication module includes a transceiver unit, which includes a first port, a second port, and a third port. The third port is used for signal transmission, and the second port is connected to the first cancellation module. The transceiver unit is used to route the excitation signal from the first port to the third port, and to route the first data signal and the excitation signal from the third port to the second port. In this way, signal routing and transmission can be achieved.
[0011] In some implementations of the first aspect, the communication module is also used to send a power supply signal to the PIOT terminal, which is used to power the PIOT terminal. This enables the power supply to the PIOT terminal.
[0012] In some implementations of the first aspect, the communication module is further configured to: send a first downlink signal to the PIOT terminal, the first downlink signal being a signal obtained by signal processing a second downlink signal from the base station; receive the first downlink signal and a third downlink signal from the base station; combine the first downlink signal, the third downlink signal, and an out-of-phase signal of the first downlink signal to obtain a second signal, the out-of-phase signal of the first downlink signal being a signal obtained by phase processing the second downlink signal; process the second signal to obtain a fourth downlink signal; and send the fourth downlink signal to the PIOT terminal.
[0013] In the above structure, by generating and using the out-of-phase signal of the first downlink signal to cancel the first downlink signal, the interference of the first downlink signal on the transmission of the third downlink signal can be reduced. Furthermore, since the interference of the first downlink signal on the transmission of the third downlink signal can be reduced, the communication equipment does not need to perform buffering processing on the third downlink signal, but only performs signal amplification processing on the third downlink signal, and can directly (without buffering) send the amplified third downlink signal (fourth downlink signal) to the base station. This reduces the hardware complexity of the communication equipment, i.e., it eliminates the need for hardware to perform signal buffering processing.
[0014] In some implementations of the first aspect, the communication device further includes a second cancellation module. The second cancellation module performs phase processing on the third signal to obtain an out-of-phase signal of the first downlink signal. The third signal is a signal obtained by processing the second downlink signal, and the first downlink signal is a signal obtained based on the third signal. Thus, based on the above structure, embodiments of this application support reducing interference from the first downlink signal to the transmission of the third downlink signal, thereby better assisting communication between the base station and the PIOT terminal.
[0015] In some implementations of the first aspect, the communication module includes a first combiner, a second processing unit, and a third processing unit. The first combiner combines a first downlink signal, a third downlink signal, and out-of-phase signals of the first downlink signal to obtain a second signal. The second processing unit processes the second downlink signal to obtain a third signal and then processes the second signal to obtain a fourth signal. The third processing unit processes the third signal to obtain a first downlink signal and then processes the fourth signal to obtain a fourth downlink signal. Thus, based on the above structure, embodiments of this application support reducing interference from the first downlink signal to the transmission of the third downlink signal, thereby better assisting communication between the base station and the PIOT terminal.
[0016] In some implementations of the first aspect, the communication device further includes a third cancellation module. The third cancellation module processes the third signal to obtain an out-of-phase noise signal, which is a signal formed when the third processing unit amplifies the third signal. The communication module also includes a second combiner, which combines the out-of-phase noise signal and a fifth signal to obtain a first downlink signal. The fifth signal is a signal obtained by the third processing unit amplifying the third signal and includes the noise signal. Thus, based on the above structure, embodiments of this application support reducing noise signal interference, thereby better assisting communication between the base station and the PIOT terminal.
[0017] In some implementations of the first aspect, the communication device further includes a delay module disposed between the second cancellation module and the second processing unit. The delay module is used to ensure that the time interval between the reception time of the out-of-phase signal of the first downlink signal and the reception time of the third downlink signal is less than or equal to a threshold. This allows the arrival time of the out-of-phase signal of the first downlink signal at the first combiner to be consistent with the arrival time of the first downlink signal at the first combiner, thereby enabling time delay alignment between the first downlink signal and its out-of-phase signal. This enhances the cancellation effect of the out-of-phase signal on the first downlink signal.
[0018] Secondly, an interference cancellation method is provided, comprising: sending an excitation signal to a PIOT terminal, the excitation signal being used to excite the PIOT terminal to send a first data signal, the frequency band of the excitation signal being the same as the frequency band of the first data signal; a communication module receiving the excitation signal and the first data signal; performing cancellation processing on the excitation signal, the first data signal, and the out-of-phase signal of the excitation signal to obtain a second data signal, the out-of-phase signal of the excitation signal being a signal generated by a first cancellation module; and sending the second data signal to a base station.
[0019] For a description of the beneficial effects of the second aspect, please refer to the description of the beneficial effects of the first aspect, which will not be repeated here.
[0020] In some implementations of the second aspect, the process of canceling the excitation signal, the first data signal, and the out-of-phase signal of the excitation signal to obtain the second data signal includes: performing phase processing on the excitation signal to obtain the out-of-phase signal of the excitation signal; and performing cancellation processing on the excitation signal, the out-of-phase signal of the excitation signal, and the first data signal to obtain the second data signal.
[0021] In some implementations of the second aspect, the cancellation processing of the excitation signal, the first data signal, and the out-of-phase signal of the excitation signal to obtain the second data signal includes: performing phase processing on the excitation signal to obtain the out-of-phase signal of the excitation signal; performing cancellation processing on the excitation signal, the out-of-phase signal of the excitation signal, and the first data signal to obtain the first data signal and a residual signal, wherein the residual signal is the signal obtained after cancelling the excitation signal with the out-of-phase signal of the excitation signal; and performing cancellation processing on the first data signal, the residual signal, and the out-of-phase signal of the residual signal to obtain the second data signal, wherein the out-of-phase signal of the residual signal is the signal obtained by performing phase processing on the first signal, and the excitation signal is the signal obtained based on the first signal.
[0022] In some implementations of the second aspect, the method further includes: sending a first downlink signal to a PIOT terminal, the first downlink signal being a signal obtained by signal processing a second downlink signal from a base station; receiving the first downlink signal and a third downlink signal from a base station; performing a combining process on the first downlink signal, the third downlink signal, and an out-of-phase signal of the first downlink signal to obtain a second signal, the out-of-phase signal of the first downlink signal being a signal obtained by phase processing the second downlink signal; performing signal processing on the second signal to obtain a fourth downlink signal; and sending the fourth downlink signal to the PIOT terminal via a communication module.
[0023] In some implementations of the second aspect, the method further includes: performing phase processing on the third signal to obtain an out-of-phase signal of the first downlink signal, wherein the third signal is a signal obtained by signal processing the second downlink signal, and the first downlink signal is a signal obtained based on the third signal.
[0024] In some implementations of the second aspect, the method further includes: combining the first downlink signal, the third downlink signal, and the out-of-phase signal of the first downlink signal to obtain a second signal; performing signal processing on the second downlink signal and the second signal respectively to obtain a third signal and a fourth signal; and performing signal processing on the third signal and the fourth signal respectively to obtain a first downlink signal and a fourth downlink signal.
[0025] In some implementations of the second aspect, the method further includes: processing the third signal to obtain an out-of-phase signal of the noise signal, the noise signal being a signal formed when the third signal is amplified; combining the out-of-phase signal of the noise signal and the fifth signal to obtain a first downlink signal, the fifth signal being a signal obtained by amplifying the third signal, the fifth signal including the noise signal.
[0026] Thirdly, a communication system is provided, comprising a base station and the communication equipment described in the first aspect, wherein the base station is used to receive a second data signal.
[0027] In some implementations of the third aspect, the communication system also includes a PIOT terminal, which is used to receive excitation signals and transmit first data signals.
[0028] For a description of the beneficial effects of the third aspect, please refer to the description of the beneficial effects of the first aspect, which will not be repeated here. Attached Figure Description
[0029] Figure 1 This is a schematic diagram illustrating an application scenario of an embodiment of this application.
[0030] Figure 2 This is a structural schematic diagram of communication device 100.
[0031] Figure 3 This is a structural diagram of the cancellation module 20.
[0032] Figure 4 This is a structural diagram of the cancellation module 20.
[0033] Figure 5 This is a schematic diagram of a communication module 10.
[0034] Figure 6 This is a structural schematic diagram of communication device 100.
[0035] Figure 7 This is a structural schematic diagram of communication device 100.
[0036] Figure 8 This is a schematic diagram of the interactive flow of the interference cancellation method according to an embodiment of this application.
[0037] Figure 9 A schematic diagram of the communication system in this application embodiment. Detailed Implementation
[0038] To facilitate understanding of the embodiments of this application, the following points will be explained first.
[0039] I. Unless otherwise specified or in case of logical conflict, the terms and / or descriptions in different embodiments of this application are consistent and can be referenced in each other. Technical features in different embodiments can be combined to form new embodiments based on their inherent logical relationships.
[0040] II. The various numerical designations used in this application are merely for descriptive convenience and are not intended to limit the scope of protection of this application. The order of the serial numbers used in this application does not imply the sequence of execution; the execution order of each process should be determined by its function and internal logic. For example, the terms "first (1)", "second (2)", "third (3)" and other various terminology (if present) in the specification, claims, and drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. Such data can be interchanged where appropriate so that the embodiments described herein can be implemented in a sequence other than that illustrated or described herein.
[0041] Furthermore, any embodiment or design described in this application as "exemplary" or "for example" should not be construed as being more preferred or advantageous than other embodiments or designs. Specifically, the use of terms such as "exemplary" or "for example" is intended to present the relevant concepts in a concrete manner for ease of understanding.
[0042] 3. The terms “comprising” and “having” and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are expressly listed, but may include other steps or units that are not expressly listed or that are inherent to such process, method, product or device.
[0043] The communication device, interference cancellation method, and communication system according to embodiments of this application are described below.
[0044] The communication equipment, interference cancellation method, and communication system described in this application can be applied to various communication systems, including but not limited to: Long Term Evolution (LTE) systems, LTE Frequency Division Duplex (FDD) systems, LTE Time Division Duplex (TDD) systems, Universal Mobile Telecommunication System (UMTS), Worldwide Interoperability for Microwave Access (WiMAX) systems, Wideband Code Division Multiple Access (WCDMA) systems, Global System for Mobile Communications (GSM) systems, Code Division Multiple Access (CDMA) systems, and 5G (5G) systems. th Generation 5G communication systems, device-to-device (D2D) systems, vehicle-to-everything (V2X) systems, or future communication networks, etc.
[0045] See Figure 1 , Figure 1 This is a schematic diagram illustrating an application scenario of an embodiment of this application. For example... Figure 1 As shown, communication device 100 assists in communication between the base station and the PIOT terminal. For example, communication device 100 sends an excitation signal 1 to the PIOT terminal, which in turn excites the PIOT terminal to send a data signal 1 to communication device 100. Alternatively, the PIOT terminal responds to the excitation signal 1 by sending a data signal 1 to communication device 100, and communication device 100 sends a data signal 1 that has undergone signal amplification to the base station. For example, the base station sends a downlink signal 1 to communication device 100, and communication device 100 sends a downlink signal 1 that has undergone signal amplification to the PIOT terminal. Communication device 100 can supply power to the PIOT terminal, and the power supply method is not limited. Furthermore, the base station is deployed outdoors, the PIOT terminal is deployed indoors, and communication device 100 is deployed indoors.
[0046] Figure 1In this context, the excitation signal 1 sent by communication device 100 to the PIOT terminal can interfere with the communication between the base station and the PIOT terminal. Similarly, the downlink signal 1 sent by communication device 100 to the PIOT terminal can also interfere with the communication between the base station and the PIOT terminal, potentially leading to a decrease in communication performance. Therefore, this application embodiment redesigns the communication device 100 to reduce the interference of the excitation signal 1 on the communication between the base station and the PIOT terminal, and also to reduce the interference of the downlink signal 1 on the communication between the base station and the PIOT terminal. For ease of description, the following description first focuses on reducing the interference of the excitation signal 1 on the communication between the base station and the PIOT terminal, and then on reducing the interference of the downlink signal 1 on the communication between the base station and the PIOT terminal. For details, please refer to... Figure 2 .
[0047] Figure 2 This is a structural schematic diagram of communication device 100. For example... Figure 2 As shown, the communication device 100 includes a communication module 10 and a cancellation module 20, which are capable of signal interaction. The communication module 10 is used to enable communication with a base station and a PIOT terminal; that is, the communication module 10 receives signals sent by the base station and sends those signals to the PIOT terminal, or the communication module 10 receives signals sent by the PIOT terminal and sends those signals to the base station.
[0048] Figure 2 In the process, the communication module 10 sends an excitation signal 1 to the PIOT terminal. The excitation signal 1 is used to excite the PIOT terminal to send a data signal 1. The frequency band of the excitation signal 1 is the same as that of the data signal 1. The communication module 10 receives the excitation signal 1 and the data signal 1 from the PIOT terminal. The cancellation module 20 performs cancellation processing on the excitation signal 1, the data signal 1, and the out-of-phase signal of the excitation signal 1 to obtain the data signal 2. The out-of-phase signal of the excitation signal 1 is the signal generated by the cancellation module 20. The communication module 10 sends the data signal 2 to the base station.
[0049] When the communication device 100 sends excitation signal 1 to the PIOT terminal, excitation signal 1 is also received by the communication device 100 (through reflection of excitation signal 1 by the PIOT terminal). Since the frequency band of excitation signal 1 is the same as that of data signal 1, excitation signal 1 will interfere with the transmission of data signal 1. Therefore, the cancellation module 20 can generate an out-of-phase signal of excitation signal 1 and use the out-of-phase signal of excitation signal 1 to cancel excitation signal 1 (i.e., use the out-of-phase signal of excitation signal 1 to cancel excitation signal 1), thereby reducing the interference of excitation signal 1 on the transmission of data signal 1.
[0050] In this embodiment, the term "out-of-phase" can be understood as: a phase difference of 180° between two signals, such as the phase difference between the phase of excitation signal 1 and the phase of its out-of-phase signal. Furthermore, the amplitude of the out-of-phase signal of excitation signal 1 can be the same as the amplitude of excitation signal 1, meaning the out-of-phase signal of excitation signal 1 is a signal with equal amplitude but out of phase; or the amplitude of the out-of-phase signal of excitation signal 1 can be different from the amplitude of excitation signal 1, meaning the out-of-phase signal of excitation signal 1 is a signal with non-equal amplitude but out of phase.
[0051] In summary, by generating an out-of-phase signal of excitation signal 1 and using this out-of-phase signal to cancel out excitation signal 1, the interference of excitation signal 1 on the transmission of data signal 1 can be reduced, thereby better assisting communication between the base station and the PIOT terminal. Furthermore, since the interference of excitation signal 1 on the transmission of data signal 1 can be reduced, the communication device 100 does not need to perform buffering processing on data signal 1, and can only perform signal amplification processing on data signal 1, and can directly (without buffering) send the amplified data signal 1 to the base station. This reduces the hardware complexity of the communication device 100, i.e., it eliminates the need for hardware for signal buffering.
[0052] The following text combines Figure 3 and Figure 4 The structure of the cancellation module 20 is further described.
[0053] like Figure 3 As shown, the cancellation module 20 includes a cancellation unit 201 and a processing unit 202. The cancellation unit 201 performs phase processing on the excitation signal 1 obtained from the communication module 10 to obtain an out-of-phase signal of the excitation signal 1, and outputs the out-of-phase signal of the excitation signal 1 to the processing unit 202. The processing unit 202 performs cancellation processing on the input excitation signal 1, the out-of-phase signal of the excitation signal 1, and the data signal 1; that is, it uses the out-of-phase signal of the excitation signal 1 to cancel the excitation signal 1 to obtain the data signal 2, and outputs the data signal 2 (to the communication module 10). When the out-of-phase signal of the excitation signal 1 is an equal-amplitude out-of-phase signal of the excitation signal 1, the out-of-phase signal of the excitation signal 1 can completely cancel the excitation signal 1, and correspondingly, the data signal 2 is the same as the data signal 1.
[0054] Figure 3 In this diagram, excitation signal 1 is an analog signal, data signal 1 is also an analog signal, and data signal 2 is an analog signal.
[0055] based on Figure 3 The structure shown in this application embodiment supports reducing the interference of excitation signal 1 on the transmission of data signal 1, thereby better assisting the communication between the base station and the PIOT terminal.
[0056] like Figure 4 As shown, the cancellation module 20 includes a cancellation unit 201, a processing unit 202, and a cancellation unit 203. The cancellation unit 201 performs phase processing on the excitation signal 1 obtained from the communication module 10 to obtain an out-of-phase signal of the excitation signal 1, and outputs the out-of-phase signal of the excitation signal 1 to the processing unit 202. The processing unit 202 performs cancellation processing on the input excitation signal 1, the out-of-phase signal of the excitation signal 1, and the data signal 1; that is, it uses the out-of-phase signal of the excitation signal 1 to cancel the excitation signal 1. When the out-of-phase signal of the excitation signal 1 cannot completely cancel the excitation signal 1, a residual signal is obtained; that is, the residual signal is the signal obtained when the out-of-phase signal of the excitation signal 1 cancels the excitation signal 1. The processing unit 202 outputs the data signal 1 and the residual signal to the cancellation unit 202. The cancellation unit 203 performs cancellation processing on the input signal 1, the data signal 1, and the residual signal to obtain and output the data signal 2.
[0057] Specifically, the cancellation unit 203 performs phase processing on signal 1 (obtained from communication module 10) to obtain an out-of-phase signal of the residual signal, and uses the out-of-phase signal of the residual signal to cancel the residual signal, finally obtaining data signal 2. Since the out-of-phase signal of the residual signal is used to cancel the residual signal, data signal 2 can be data signal 1. In addition, excitation signal 1 is a signal obtained based on signal 1.
[0058] Figure 4 In the given scenario, if signal 1 is a digital signal, data signal 1, and the residual signal are all digital signals, then the out-of-phase signal of the residual signal is a digital signal. If signal 1 is a digital signal, data signal 1, and the residual signal are all analog signals, then the out-of-phase signal of the residual signal is an analog signal. If signal 1 is an analog signal, data signal 1, and the residual signal are all analog signals, then the out-of-phase signal of the residual signal is an analog signal. If signal 1 is an analog signal, data signal 1, and the residual signal are all digital signals, then the out-of-phase signal of the residual signal is a digital signal.
[0059] based on Figure 4 The structure shown in this application embodiment supports reducing the interference of excitation signal 1 on the transmission of data signal 1, thereby better assisting the communication between the base station and the PIOT terminal. Compared to Figure 3 The structure shown, Figure 4 The structure shown enables cleaner cancellation of the excitation signal 1.
[0060] In this embodiment, the cancellation module 20 includes devices such as an adaptive filter and a digital-to-analog converter (DAC).
[0061] The following text combines Figure 5The structure of the communication module 10 is described exemplarily.
[0062] like Figure 5 As shown, the communication module 10 includes a processing unit 101 and a processing unit 102. Optionally, the communication module 10 further includes a transceiver unit 103, which is used to send an excitation signal 1 to the PIOT terminal and receive the excitation signal 1 and data signal 1 from the PIOT terminal. The transceiver unit 103 includes port 1, port 2, and port 3. Port 3 is used for signal transmission, i.e., for sending and receiving the excitation signal 1 and data signal 1. Port 2 is connected to the cancellation module 20 (connected to the cancellation unit 201). The processing unit 101 may include one or more of an analog-to-digital converter (ADC), a gain control device, and a signal delay device, and may also include other devices. The processing unit 102 may include one or more of a DAC, a small-signal amplification device, a power amplifier, and a signal delay device, and may also include other devices.
[0063] Figure 5 In the process, the processing unit 101 outputs signal 1, and the processing unit 102 performs signal processing on the input signal 1 (such as signal filtering, gain control, filtering, frequency shifting, etc.) to obtain excitation signal 1.
[0064] based on Figure 5 The content shown, Figure 3 and Figure 4 The cancellation unit 201 shown obtains excitation signal 1 from the processing unit 102. Figure 4 The cancellation unit 203 shown obtains signal 1 from the processing unit 101.
[0065] The above description uses the reduction of interference from excitation signal 1 to communication between the base station and the PIOT terminal as an example. The following description focuses on reducing the interference from downlink signal 1 to communication between the base station and the PIOT terminal. The scenarios for reducing interference from excitation signal 1 and downlink signal 1 to communication between the base station and the PIOT terminal can be decoupled or interconnected; this is not limited.
[0066] In this embodiment of the application, the communication module 10 is used to: send downlink signal 1 to the PIOT terminal, wherein downlink signal 1 is a signal obtained by signal processing of downlink signal 2 from the base station; receive downlink signal 1 and downlink signal 2 from the base station; combine downlink signal 1, downlink signal 3 and out-of-phase signal of downlink signal 1 to obtain signal 2, wherein out-of-phase signal of downlink signal 1 is a signal obtained by phase processing of downlink signal 2; process signal 2 to obtain downlink signal 4; and send downlink signal 4 to the PIOT terminal.
[0067] When communication device 100 sends downlink signal 1 to the PIOT terminal, downlink signal 1 is also received by communication device 100. Therefore, downlink signal 1 will interfere with the transmission of downlink signal 3 sent by the base station. Therefore, communication device 100 generates an out-of-phase signal for downlink signal 1 and uses this out-of-phase signal to cancel downlink signal 1, thereby reducing the interference of downlink signal 1 on the transmission of downlink signal 3. For a description of the out-of-phase signal for downlink signal 1, please refer to the description of the out-of-phase signal for excitation signal 1 above, which will not be repeated here. Furthermore, the transmission time of downlink signal 2 is before the transmission time of downlink signal 3. The time when communication device 100 receives downlink signal 1 can be before or after the time when communication device 100 receives downlink signal 3. Alternatively, the downlink signal 1 received by communication device 100 may interfere with the transmission of downlink signal 3.
[0068] In this embodiment of the application, the amplitude of the out-of-phase signal of downlink signal 1 can be the same as the amplitude of downlink signal 1, that is, the out-of-phase signal of downlink signal 1 is a signal with equal amplitude but out of phase of downlink signal 1; the amplitude of the out-of-phase signal of downlink signal 1 can be different from the amplitude of downlink signal 1, that is, the out-of-phase signal of downlink signal 1 is a signal with non-equal amplitude but out of phase of downlink signal 1.
[0069] In summary, by generating an out-of-phase signal of downlink signal 1 and using this out-of-phase signal to cancel out downlink signal 1, the interference of downlink signal 1 on the transmission of downlink signal 3 can be reduced. Furthermore, since the interference of downlink signal 1 on the transmission of downlink signal 3 can be reduced, the communication device 100 does not need to perform buffering processing on downlink signal 3, but only performs signal amplification processing on downlink signal 3, and can directly (without buffering) send the amplified downlink signal 3 (downlink signal 4) to the base station. This reduces the hardware complexity of the communication device 100, i.e., it eliminates the need for hardware for signal buffering.
[0070] In the above description, the out-of-phase signal of downlink signal 1 is generated by the cancellation module 30 in communication device 100. See also... Figure 6 .
[0071] Figure 6This is a structural schematic diagram of communication device 100. For example... Figure 6 As shown, the communication device 100 includes a communication module 10 and a cancellation module 30. The communication module 10 includes a processing unit 101, a processing unit 102, and a combiner 104 (the transceiver unit 103 is not shown). The output port of the combiner 104 is connected to the input port of the processing unit 101. The first input port of the combiner 104 is used to input downlink signal 2 from the base station, downlink signal 1 from the communication device 100, and downlink signal 3 from the base station. The second input port of the combiner 104 is used to input the out-of-phase signal of downlink signal 1 from the cancellation module 30. In other words, the second input port of the combiner 104 is connected to the output port of the cancellation module 30.
[0072] Figure 6 In this process, processing unit 101 first processes the downlink signal 2 input to combiner 104 (such as signal filtering, shaping, gain control, and amplification) to obtain and output signal 3. Processing unit 102 amplifies signal 3 to obtain and output downlink signal 1. Cancellation module 30 processes signal 3 to obtain and output the out-of-phase signal of downlink signal 1. When combiner 104 receives downlink signal 1 from communication device 100, downlink signal 3 from base station, and the out-of-phase signal of downlink signal 1 from cancellation module 30, combiner 104 performs combining processing on downlink signal 1, downlink signal 3, and the out-of-phase signal of downlink signal 1 to obtain and output signal 2. Processing unit 101 processes signal 2 to obtain and output signal 4. Processing unit 102 amplifies signal 4 to obtain and output downlink signal 4. The communication device 100 receives downlink signal 2 before receiving downlink signal 3.
[0073] based on Figure 6 The structure shown in this application embodiment supports reducing the interference of downlink signal 1 on the transmission of downlink signal 3, thereby better assisting the communication between the base station and the PIOT terminal.
[0074] Optionally, the communication device 100 may further include a delay module 50, which is disposed between the cancellation module 30 and the processing unit 101. The delay module 50 is used to ensure that the time interval between the reception time of the out-of-phase signal of downlink signal 1 and the reception time of downlink signal 3 is less than or equal to a threshold. This allows the arrival time of the out-of-phase signal of downlink signal 1 at the combiner 104 to be consistent with the arrival time of downlink signal 1 at the combiner 104, thereby enabling time delay alignment between downlink signal 1 and its out-of-phase signal. This enhances the cancellation effect of the out-of-phase signal of downlink signal 1 on downlink signal 1.
[0075] Figure 6Furthermore, this application can also support noise cancellation processing for the noise signal generated when the processing unit 102 amplifies the signal 3. See also... Figure 7 .
[0076] Figure 7 This is a structural schematic diagram of communication device 100. For example... Figure 7 As shown, the communication device 100 includes a communication module 10, a cancellation module 30, and a cancellation module 40. The communication module 10 includes a processing unit 101, a processing unit 102, a combiner 104, and a combiner 105 (transceiver unit 103 is not shown). The output port of the combiner 104 is connected to the input port of the processing unit 101. The first input port of the combiner 104 receives downlink signal 2, downlink signal 1, and downlink signal 3. The second input port of the combiner 104 receives the out-of-phase signal of downlink signal 1; or, the second input port of the combiner 104 is connected to the output port of the cancellation module 30. The third input port of the combiner 105 is connected to the output port of the cancellation module 40, and the fourth input port of the combiner 105 is connected to the processing unit 102. The output port of the combiner 105 is used to output downlink signal 1.
[0077] Figure 7 In this process, processing unit 101 first processes the downlink signal 2 input to combiner 104 to obtain and output signal 3. Processing unit 102 amplifies signal 3 to obtain and output signal 5. Signal 5 includes a noise signal, which is formed when processing unit 102 amplifies signal 3. Cancellation module 40 processes the input signal 3 to obtain and output an out-of-phase noise signal. Combiner 105 combines the out-of-phase noise signal and signal 5 to obtain and output downlink signal 1. Thus, based on the above structure, this embodiment supports reducing noise interference, thereby better assisting communication between base station and PIOT terminal.
[0078] Optionally, the communication device 100 may further include a delay module 50, which is disposed between the cancellation module 30 and the processing unit 101. The delay module 50 is used to ensure that the time interval between the reception time of the out-of-phase signal of downlink signal 1 and the reception time of downlink signal 3 is less than or equal to a threshold. This allows the arrival time of the out-of-phase signal of downlink signal 1 at the combiner 104 to be consistent with the arrival time of downlink signal 1 at the combiner 104, thereby enabling time delay alignment between downlink signal 1 and its out-of-phase signal. This enhances the cancellation effect of the out-of-phase signal of downlink signal 1 on downlink signal 1.
[0079] in addition, Figures 2 to 7The communication device 100 shown can also send a power supply signal to the PIOT terminal, which is used to power the PIOT terminal. This enables power supply to the PIOT terminal. The communication device 100 may also include means or modules (without limitation on specific structure) for generating the power supply signal.
[0080] The following text combines Figure 8 The interference cancellation method according to the embodiments of this application will be described.
[0081] Figure 8 This is a schematic diagram of the interactive flow of the interference cancellation method according to an embodiment of this application. For example... Figure 8 As shown, the method includes:
[0082] S801, Communication device 100 sends excitation signal 1 to PIOT terminal. Correspondingly, PIOT terminal receives excitation signal 1.
[0083] S802, the PIOT terminal sends data signal 1 and excitation signal 1 to the communication device 100. Correspondingly, the communication device 100 receives data signal 1.
[0084] Specifically, the PIOT terminal responds to the excitation signal 1 by sending a data signal 1 to the communication device 100, and also reflects the excitation signal 1 sent by the communication device 100, so that the communication device 100 also receives the excitation signal 1.
[0085] S803, the communication device 100 performs cancellation processing on the excitation signal 1, the out-of-phase signal of the excitation signal 1, and the data signal 1 to obtain the data signal 2.
[0086] S804, Communication device 100 sends data signal 2 to the base station. Correspondingly, the base station receives data signal 2.
[0087] The above method can help reduce the interference caused by the excitation signal 1 to the transmission of the data signal 1, thereby better assisting the communication between the base station and the PIOT terminal.
[0088] Optionally, the method further includes:
[0089] S805, communication device 100 sends downlink signal 1 to the PIOT terminal. Correspondingly, the PIOT terminal receives downlink signal 1. Correspondingly, communication module 10 also receives downlink signal 1.
[0090] S806, the communication device 100 receives downlink signal 1, downlink signal 3, and an out-of-phase signal of downlink signal 1. Downlink signal 3 is transmitted from the base station to the communication module 10.
[0091] S807, the communication equipment 100 performs a combining process on downlink signal 1, downlink signal 3 and the out-of-phase signal of downlink signal 1 to obtain signal 2.
[0092] S808, communication equipment 100 performs signal processing on signal 2 to obtain downlink signal 4;
[0093] S809, Communication equipment 100 sends downlink signal 4 to PIOT terminal.
[0094] The above method can help reduce the interference caused by downlink signal 1 to the transmission of downlink signal 3, thereby better assisting the communication between the base station and the PIOT terminal.
[0095] The following text combines Figure 9 The communication system described in this application is an embodiment of the application.
[0096] Figure 9 A schematic diagram of the communication system according to an embodiment of this application. (See diagram below.) Figure 9 As shown, the communication system includes: a communication device 100 and a base station. The communication device 100 is used to transmit signals from the base station.
[0097] For example, the base station sends downlink signal 3 to the communication device 100, the communication device 100 performs the aforementioned processing on the downlink signal 3 to obtain downlink signal 4, and sends downlink signal 4 to the terminal. The base station can be deployed indoors or outdoors; there is no limitation on this.
[0098] Optionally, the aforementioned communication system may further include a PIOT terminal, and the communication device 100 is used to send an excitation signal 1 to the PIOT terminal and to receive the excitation signal 1 and the data signal 1. The PIOT terminal can be deployed indoors or outdoors, and there is no limitation thereto.
[0099] Those skilled in the art will recognize that the units of the various examples described in connection with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these 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 this application.
[0100] Those skilled in the art will understand that, for the sake of convenience and brevity, the specific working processes of the systems, devices, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here.
[0101] In the embodiments provided in this application, it should be understood that the disclosed systems, apparatuses, and methods can be implemented in other ways. For example, the base station apparatus embodiments described above are merely illustrative. For instance, the division of modules is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple modules or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces, indirect coupling or communication connection of devices or modules, and may be electrical, mechanical, or other forms.
[0102] The modules described as separate components may or may not be physically separate. The components shown as modules may or may not be physical modules; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs.
[0103] In addition, the functional modules in the embodiments of this application can be integrated into one processing unit, or each module can exist physically separately, or two or more modules can be integrated into one module.
[0104] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.
Claims
1. A communication device, characterized in that, include: Communication module and first cancellation module; The communication module is configured to send an excitation signal to a passive IoT terminal, the excitation signal being used to excite the passive IoT terminal to send a first data signal, the frequency band of the excitation signal being the same as the frequency band of the first data signal; and to receive the excitation signal and the first data signal from the passive IoT terminal. The first cancellation module is used to cancel the excitation signal, the first data signal, and the out-of-phase signal of the excitation signal to obtain the second data signal. The out-of-phase signal of the excitation signal is a signal generated by the first cancellation module. The communication module is also used to send the second data signal to the base station.
2. The communication device according to claim 1, characterized in that, The first cancellation module includes a first cancellation unit and a first processing unit; The first cancellation unit is used to perform phase processing on the excitation signal to obtain an out-of-phase signal of the excitation signal; The first processing unit is used to perform cancellation processing on the excitation signal, the out-of-phase signal of the excitation signal, and the first data signal to obtain the second data signal.
3. The communication device according to claim 1, characterized in that, The first cancellation module includes a first cancellation unit, a first processing unit, and a second cancellation unit; The first cancellation unit is used to perform phase processing on the excitation signal to obtain an out-of-phase signal of the excitation signal; The first processing unit is configured to perform cancellation processing on the excitation signal, the out-of-phase signal of the excitation signal, and the first data signal to obtain the first data signal and a residual signal. The residual signal is the signal obtained after the out-of-phase signal of the excitation signal is canceled on the excitation signal. The second cancellation unit is used to perform cancellation processing on the first data signal, the residual signal, and the out-of-phase signal of the residual signal to obtain the second data signal. The out-of-phase signal of the residual signal is a signal obtained by phase processing of the first signal, and the excitation signal is a signal obtained based on the first signal.
4. The communication device according to any one of claims 1 to 3, characterized in that, The communication module includes a transceiver unit, which includes a first port, a second port, and a third port. The third port is used for signal transmission, and the second port is connected to the first cancellation module. The transceiver unit is configured to route the excitation signal from the first port to the third port; and to route the first data signal and the excitation signal from the third port to the second port.
5. The communication device according to any one of claims 1 to 4, characterized in that, The communication module is also used to send a power supply signal to the passive IoT terminal, the power supply signal being used to power the passive IoT terminal.
6. The communication device according to any one of claims 1 to 5, characterized in that, The communication module is also used for: Send a first downlink signal to the passive IoT terminal, wherein the first downlink signal is a signal obtained by signal processing a second downlink signal from the base station; Receive the first downlink signal and the third downlink signal from the base station; The first downlink signal, the third downlink signal, and the out-of-phase signal of the first downlink signal are combined to obtain the second signal, wherein the out-of-phase signal of the first downlink signal is obtained by phase processing of the second downlink signal; The second signal is processed to obtain the fourth downlink signal; The fourth downlink signal is sent to the passive IoT terminal.
7. The communication device according to claim 6, characterized in that, The communication device also includes a second cancellation module; The second cancellation module is used to perform phase processing on the third signal to obtain an out-of-phase signal of the first downlink signal. The third signal is a signal obtained by processing the second downlink signal, and the first downlink signal is a signal obtained based on the third signal.
8. The communication device according to claim 7, characterized in that, The communication module includes a first combiner, a second processing unit, and a third processing unit; The first combiner is used to combine the first downlink signal, the third downlink signal, and the out-of-phase signal of the first downlink signal to obtain the second signal; The second processing unit is configured to perform signal processing on the second downlink signal to obtain the third signal; and to perform signal processing on the second signal to obtain the fourth signal; The third processing unit is used to perform signal processing on the third signal to obtain the first downlink signal; and to perform signal processing on the fourth signal to obtain the fourth downlink signal.
9. The communication device according to claim 8, characterized in that, The communication device also includes a third cancellation module; The third cancellation module is used to process the third signal to obtain an out-of-phase noise signal, wherein the noise signal is a signal formed when the third processing unit amplifies the third signal; The communication module also includes a second combiner; The second combiner is used to combine the out-of-phase signal of the noise signal and the fifth signal to obtain the first downlink signal. The fifth signal is a signal obtained by the third processing unit amplifying the third signal, and the fifth signal includes the noise signal.
10. The communication device according to any one of claims 7 to 9, characterized in that, The communication device further includes a delay module, which is disposed between the second cancellation module and the second processing unit; The delay module is configured to ensure that the time interval between the reception time of the out-of-phase signal of the first downlink signal and the reception time of the third downlink signal is less than or equal to a threshold.
11. An interference cancellation method, characterized in that, include: An excitation signal is sent to a passive IoT terminal, the excitation signal being used to excite the passive IoT terminal to send a first data signal, the frequency band of the excitation signal being the same as the frequency band of the first data signal; Receive the excitation signal and the first data signal; The excitation signal, the first data signal, and the out-of-phase signal of the excitation signal are canceled to obtain the second data signal, wherein the out-of-phase signal of the excitation signal is a signal generated by the first cancellation module; The second data signal is sent to the base station.
12. The method according to claim 11, characterized in that, The step of canceling out the excitation signal, the first data signal, and the out-of-phase signal of the excitation signal to obtain the second data signal includes: Phase processing is performed on the excitation signal to obtain an out-of-phase signal of the excitation signal; The excitation signal, the out-of-phase signal of the excitation signal, and the first data signal are canceled to obtain the second data signal.
13. The method according to claim 11, characterized in that, The step of canceling out the excitation signal, the first data signal, and the out-of-phase signal of the excitation signal to obtain the second data signal includes: Phase processing is performed on the excitation signal to obtain an out-of-phase signal of the excitation signal; The excitation signal, the out-of-phase signal of the excitation signal, and the first data signal are canceled to obtain the first data signal and the residual signal. The residual signal is the signal obtained after canceling the excitation signal with the out-of-phase signal of the excitation signal. The second data signal is obtained by canceling the first data signal, the residual signal, and the out-of-phase signal of the residual signal. The out-of-phase signal of the residual signal is a signal obtained by phase processing the first signal. The excitation signal is a signal obtained based on the first signal.
14. The method according to any one of claims 11 to 13, characterized in that, The method further includes: Send a first downlink signal to the passive IoT terminal. The first downlink signal is a signal obtained by signal processing a second downlink signal from the base station. Receive the first downlink signal and the third downlink signal from the base station; The first downlink signal, the third downlink signal, and the out-of-phase signal of the first downlink signal are combined to obtain the second signal, wherein the out-of-phase signal of the first downlink signal is obtained by phase processing of the second downlink signal; The second signal is processed to obtain the fourth downlink signal; The fourth downlink signal is sent to the passive IoT terminal.
15. The method according to claim 14, characterized in that, The method further includes: Phase processing is performed on the third signal to obtain the out-of-phase signal of the first downlink signal. The third signal is a signal obtained by signal processing the second downlink signal, and the first downlink signal is a signal obtained based on the third signal.
16. The method according to claim 15, characterized in that, The method further includes: The first downlink signal, the third downlink signal, and the out-of-phase signal of the first downlink signal are combined to obtain the second signal; The second downlink signal and the second signal are respectively processed to obtain the third signal and the fourth signal; The third signal and the fourth signal are processed to obtain the first downlink signal and the fourth downlink signal, respectively.
17. The method according to claim 15, characterized in that, The method further includes: The third signal is processed to obtain an out-of-phase noise signal, wherein the noise signal is a signal formed when the third signal is amplified. The first downlink signal is obtained by combining the out-of-phase signal of the noise signal and the fifth signal. The fifth signal is obtained by amplifying the third signal and includes the noise signal.
18. A communication system, characterized in that, The communication system includes a base station and a communication device according to any one of claims 1 to 10, wherein the base station is used to receive the second data signal.
19. The communication system of claim 18, wherein, The communication system also includes a passive IoT terminal, which is used to receive the excitation signal and send the first data signal.