CN110061759B - Method and system for self-interference suppression in radio frequency domain of electromagnetic spectrum umbrella cover - Google Patents
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Abstract
本发明公开了一种电磁频谱伞罩射频域自干扰抑制方法及系统，方法包括：第一信号转换模块对通过通信接收机的第一输入端进入的信号进行转换后发送至干扰信号重建模块；干扰信号重建模块从频率、时间、幅度、相位四个维度对本地重建干扰信号进行补偿，同时根据影响对补偿后的重建干扰信号进行功分器补偿和合路器补偿；第二信号转换模块将补偿完成后的信号通过通信接收机的输出端和放大器输入至合路器的第二输入端。本发明提供了对接收射频信号的有效处理架构，可以实现将自干扰射频信号抑制到接收通道的动态范围以内，以防止接收通道饱和；伞罩自干扰的抑制不受通信信号的类型制约，可以与任何已有的通信链路相结合，兼容性较强。
The invention discloses a method and a system for suppressing self-interference in the radio frequency domain of an electromagnetic spectrum umbrella cover. The method includes: a first signal conversion module converts a signal entered through a first input end of a communication receiver and sends it to an interference signal reconstruction module; The interference signal reconstruction module compensates the local reconstructed interference signal from the four dimensions of frequency, time, amplitude and phase, and at the same time performs power divider compensation and combiner compensation on the compensated reconstructed interference signal according to the influence; the second signal conversion module will compensate The completed signal is input to the second input terminal of the combiner through the output terminal of the communication receiver and the amplifier. The invention provides an effective processing structure for the received radio frequency signal, which can suppress the self-interference radio frequency signal within the dynamic range of the receiving channel to prevent the saturation of the receiving channel; the self-interference suppression of the umbrella cover is not restricted by the type of the communication signal, and can Combined with any existing communication link, the compatibility is strong.
Description
技术领域technical field
本发明涉及电磁频谱伞罩系统，尤其涉及一种电磁频谱伞罩射频域自干扰抑制方法及系统。The invention relates to an electromagnetic spectrum umbrella system, in particular to a method and system for suppressing self-interference in the radio frequency domain of an electromagnetic spectrum umbrella.
背景技术Background technique
近二十年来，爆炸性增长的无线通信业务与日益短缺的电磁频谱之间的矛盾驱动着无线通信理论与技术的变革。当电磁频谱伞罩大功率电子系统开机工作时，产生的同时同频干扰信号的辐射功率远超过己方电台接收机的灵敏度，严重时直接阻塞接收机的设备前端，造成这些设备接收中断。In the past two decades, the contradiction between the explosive growth of wireless communication services and the increasing shortage of electromagnetic spectrum has driven the revolution of wireless communication theory and technology. When the high-power electronic system of the electromagnetic spectrum umbrella is turned on, the radiated power of the co-channel interference signal generated at the same time far exceeds the sensitivity of the own radio receiver. In severe cases, it directly blocks the front end of the receiver equipment, causing the reception of these equipment to be interrupted.
目前学术界给出的自干扰抑制技术可以分为三类：空域隔离、射频自干扰抑制和数字自干扰抑制，其功能与关系如下：At present, the self-interference suppression technologies given by the academic community can be divided into three categories: airspace isolation, radio frequency self-interference suppression and digital self-interference suppression. Their functions and relationships are as follows:
(1)空域隔离：指收发机共用天线条件下环形器的收发端口之间的隔离或者收发天线分离条件下天线之间的自由空间衰减，提供了初步的自干扰抑制，避免了射频自干扰抑制电路工作于大功率状态而引入非线性畸变；(1) Airspace isolation: refers to the isolation between the transceiver ports of the circulator under the condition that the transceivers share the antenna or the free space attenuation between the antennas under the condition that the transceiver antennas are separated, which provides preliminary self-interference suppression and avoids radio frequency self-interference suppression. The circuit works in a high-power state and introduces nonlinear distortion;
(2)射频自干扰抑制：工作在接收通道前端，将自干扰信号一直到接收通道的动态范围以内，以防止接收通道饱和，进而保证数字自干扰抑制正常工作；(2) RF self-interference suppression: work at the front end of the receiving channel, and keep the self-interference signal within the dynamic range of the receiving channel to prevent the saturation of the receiving channel, thereby ensuring the normal operation of digital self-interference suppression;
(3)数字自干扰抑制：工作于数模转换器和解调器之间，将自干扰信号抑制到底噪以下以避免解调性能下降。(3) Digital self-interference suppression: It works between the digital-to-analog converter and the demodulator to suppress the self-interference signal below the bottom noise to avoid demodulation performance degradation.
本申请聚焦于射频域自干扰抑制，研究实现射频域自干扰抑制方法与系统，重点研究实现射频自干扰抑制的实施架构与系统This application focuses on the self-interference suppression in the radio frequency domain, studies the method and system for realizing the self-interference suppression in the radio frequency domain, and focuses on the implementation architecture and system for realizing the self-interference suppression in the radio frequency domain.
发明内容SUMMARY OF THE INVENTION
本发明的目的在于克服现有技术的不足，提供一种电磁频谱伞罩射频域自干扰抑制方法及系统，可以实现将自干扰信号抑制到接收通道的动态范围以内，以防止接收通道饱和。The purpose of the present invention is to overcome the deficiencies of the prior art and provide a method and system for suppressing self-interference in the radio frequency domain of an electromagnetic spectrum umbrella, which can suppress the self-interference signal within the dynamic range of the receiving channel to prevent the receiving channel from being saturated.
本发明的目的是通过以下技术方案来实现的：The purpose of this invention is to realize through the following technical solutions:
本发明的第一方面，提供一种电磁频谱伞罩射频域自干扰抑制方法，基于通信接收机和外围电路，所述外围电路包括接收天线、功分器、延时器、合路器、衰减器和放大器；所述方法包括：A first aspect of the present invention provides a method for suppressing self-interference in the radio frequency domain of an electromagnetic spectrum umbrella, based on a communication receiver and a peripheral circuit, the peripheral circuit including a receiving antenna, a power divider, a delay, a combiner, an attenuator a device and an amplifier; the method includes:
获取功分器、合路器对输入信号的影响，并设定延时器的延时量；Obtain the influence of the power divider and combiner on the input signal, and set the delay amount of the delay device;
接收天线接收包括通信信号和自干扰信号在内的射频信号，所述射频信号通过功分器的第一输出端和衰减器发送至通信接收机的第一输入端，同时通过功分器的第二输出端和延时器发送至合路器的第一输入端；所述自干扰信号为根据伞罩干扰基带序列y(n)产生的信号；The receiving antenna receives radio frequency signals including communication signals and self-interference signals, the radio frequency signals are sent to the first input end of the communication receiver through the first output end of the power divider and the attenuator, and simultaneously pass through the first output end of the power divider and the attenuator. The two output ends and the delay device are sent to the first input end of the combiner; the self-interference signal is a signal generated according to the canopy interference baseband sequence y(n);
第一信号转换模块对通过通信接收机的第一输入端进入的信号进行转换后发送至干扰信号重建模块；干扰信号重建模块从频率、时间、幅度、相位四个维度对本地重建干扰信号进行补偿，同时根据所述影响对补偿后的重建干扰信号进行功分器补偿和合路器补偿；第二信号转换模块将补偿完成后的信号通过通信接收机的输出端和放大器输入至合路器的第二输入端；The first signal conversion module converts the signal entered through the first input end of the communication receiver and sends it to the interference signal reconstruction module; the interference signal reconstruction module compensates the locally reconstructed interference signal from four dimensions of frequency, time, amplitude and phase , and perform power divider compensation and combiner compensation on the compensated reconstructed interference signal according to the influence; the second signal conversion module inputs the compensated signal to the first signal of the combiner through the output end of the communication receiver and the amplifier. two input terminals;
合路器将两路信号合成后得到射频干扰抵消后的信号，并输入至通信接收机的第二输入端进行后续处理。The combiner synthesizes the two signals to obtain a signal after radio frequency interference cancellation, which is input to the second input end of the communication receiver for subsequent processing.
进一步地，所述获取功分器、合路器对输入信号的影响包括：Further, the obtaining of the influence of the power divider and the combiner on the input signal includes:
在不接功分器、延时器和合路器的情况下，从接收天线A输入任意已知信号RA(t)并从通信接收机的第一输入端进入，经过第一信号转换模块后得到信号RA(n)；In the case of not connecting the power divider, delayer and combiner, input any known signal R A (t) from the receiving antenna A and enter from the first input end of the communication receiver, after passing through the first signal conversion module get the signal R A (n);
在不接延时器和合路器的情况下，从接收天线A输入任意已知信号RA(t)，经过功分器分为D、B两路，分别由通信接收机的第一输入端和通信接收机的第二输入端进入通信接收机，并分别经过第一信号转换模块和与第一信号转模块相同的第三信号转换模块，得到两路信号分别为RB(n)和RD(n)；In the case of not connecting the delayer and the combiner, input any known signal R A (t) from the receiving antenna A, and divide it into D and B through the power divider. and the second input terminal of the communication receiver enters the communication receiver, and passes through the first signal conversion module and the third signal conversion module identical to the first signal conversion module, respectively, to obtain two signals R B (n) and R respectively. D (n);
功分器的AB支路输入输出信号性能的影响为：The influence of the input and output signal performance of the AB branch of the power divider is:
其中，ηAB为AB支路输入信号的幅度变化量，θAB为AB支路输入信号的相位变化量；Wherein, η AB is the amplitude variation of the AB branch input signal, and θ AB is the phase variation of the AB branch input signal;
功分器的AD支路输入输出信号性能的影响为：The influence of the input and output signal performance of the AD branch of the power divider is:
其中，ηAD为AD支路输入信号的幅度变化量，θAD为AD支路输入信号的相位变化量。Among them, η AD is the amplitude variation of the AD branch input signal, and θ AD is the phase variation of the AD branch input signal.
而功分器的AB支路和AD支路的性能差异为：The performance difference between the AB branch and the AD branch of the power divider is:
其中，ηBD为信号AB支路和AD支路的幅度差异，θBD分别为信号AB支路和AD支路的相位差异；Wherein, η BD is the amplitude difference between the signal AB branch and AD branch, and θ BD is the phase difference between the signal AB branch and AD branch;
在不接功分器和延时器的情况下，将合路器的第二输入端E空置，从合路器的第一输入端C输入任意已知信号RA(t)，合路器的输出端J从通信接收机的第一输入端进入，经过第一信号转换模块后得到信号RC(n)，则合路器CJ支路输入输出信号的性能差异为
在不接功分器和延时器的情况下，将合路器的第一输入端C空置，从合路器的第二输入端E输入任意已知信号RA(t)，合路器的输出端J从通信接收机的第一输入端进入，经过第一信号转换模块后得到信号RE(n)，则合路器EJ支路输入输出信号的性能差异为
则合路器CJ支路和EJ支路的性能差异为
进一步地，所述设定延时器的延时量包括：Further, the delay amount of the set delay device includes:
获取位于功分器的第一输出端D处信号rD(t)经通信接收机处理后得到的位于合路器的第二输入端E处重建信号
根据所述处理时间延迟τDE，在延时器中对功分器的第二输出端B处信号进行时延补偿。According to the processing time delay τ DE , delay compensation is performed on the signal at the second output end B of the power divider in the delay device.
进一步地，所述的接收天线接收包括通信信号和自干扰信号在内的射频信号中，射频信号RA(t)为：Further, in the radio frequency signal received by the described receiving antenna including the communication signal and the self-interference signal, the radio frequency signal R A (t) is:
其中rS(t)为接收射频信号中有用信号部分即通信信号；n(t)为加性噪声部分；剩余部分为射频干扰信号部分即自干扰信号，包含了干扰信号y(t)，时变的频偏Δf(t)、时延τ(t)、幅度变化η(t)和相位变化θ(t)；fc为射频干扰信号的载波频率；Among them, r S (t) is the useful signal part of the received radio frequency signal, that is, the communication signal; n (t) is the additive noise part; the remaining part is the radio frequency interference signal part, that is, the self-interference signal, including the interference signal y(t), when Variable frequency offset Δf(t), time delay τ(t), amplitude change η(t) and phase change θ(t); f c is the carrier frequency of the radio frequency interference signal;
所述射频信号通过功分器的第一输出端D后，D端信号为：After the radio frequency signal passes through the first output end D of the power divider, the signal at the D end is:
D端信号送至β倍衰减器，将信号抑制到接收通道的动态范围以内，然后进入通信接收机的第一输入端，经第一信号转换模块处理后，第一信号转换模的输出端H输出的信号序列为：The D-terminal signal is sent to the β-time attenuator to suppress the signal within the dynamic range of the receiving channel, and then enters the first input end of the communication receiver. After being processed by the first signal conversion module, the output end H of the first signal conversion mode The output signal sequence is:
其中，
所述干扰信号重建模块从频率、时间、幅度、相位四个维度对本地重建干扰信号进行补偿，同时根据所述影响对补偿后的重建干扰信号进行功分器补偿和合路器补偿包括：The interference signal reconstruction module compensates the local reconstructed interference signal from four dimensions of frequency, time, amplitude and phase, and simultaneously performs power divider compensation and combiner compensation on the compensated reconstructed interference signal according to the influence, including:
对rH(n)进行频偏、时延、幅度和相位变化参数估计，记频偏估计值为
利用估计值对重建干扰信号进行补偿，补偿后的重建干扰信号为：The estimated value is used to compensate the reconstructed interference signal, and the reconstructed interference signal after compensation is:
对补偿后得到的信号
对补偿后得到的信号
完成对重建干扰信号的补偿的信号
经与β倍衰减器对应的β倍放大器后，合路器的第二输入端E处信号表示为：After the β-fold amplifier corresponding to the β-fold attenuator, the signal at the second input end E of the combiner is expressed as:
进一步地，功分器的第二输出端B的实时信号为：Further, the real-time signal of the second output end B of the power divider is:
B端信号经延时器后得到合路器的第一输入端C端信号：After the B-terminal signal passes through the delayer, the C-terminal signal of the first input terminal of the combiner is obtained:
合路器的第一输入端C和合路器的第二输入端E经过合路后，输出合路器的输出端J的信号，表示为：After the first input terminal C of the combiner and the second input terminal E of the combiner are combined, the signal of the output terminal J of the combiner is output, which is expressed as:
其中：in:
式中，rJ(t)为对接收射频信号rA(t)进行射频干扰抵消后的信号。In the formula, r J (t) is the signal after the radio frequency interference cancellation is performed on the received radio frequency signal r A (t).
进一步地，所述后续处理包括将抑制后的信号rJ(t)变换为数字域后进一步进行处理。Further, the subsequent processing includes further processing after transforming the suppressed signal r J (t) into the digital domain.
进一步地，所述第一信号转换模块包括顺次连接的模数转换器ADC、数字下变频DDC和成型滤波器；所述第二信号转换模块包括顺次连接的成型滤波器、数字上变频DUC和数模转换器DAC。Further, the first signal conversion module includes an analog-to-digital converter ADC, a digital down-conversion DDC and a shaping filter connected in sequence; the second signal conversion module includes a shaping filter, a digital up-conversion DUC connected in sequence and a digital-to-analog converter DAC.
进一步地，所述通信信号由外部通信发射机产生，经过成型滤波器、数字上变频DUC和数模转换器DAC后发射；所述自干扰信号由外部干扰发射机根据伞罩干扰基带序列y(n)产生，经过成型滤波器、数字上变频DUC和数模转换器DAC后发射。Further, the communication signal is generated by an external communication transmitter, and is transmitted after a shaping filter, a digital up-conversion DUC and a digital-to-analog converter DAC; the self-interference signal is interfered with the baseband sequence y ( n) Generate, transmit after shaping filter, digital up-conversion DUC and digital-to-analog converter DAC.
本发明的第二方面，提供一种电磁频谱伞罩射频域自干扰抑制系统，采用所述的方法，所述系统包括：A second aspect of the present invention provides an electromagnetic spectrum umbrella cover radio frequency domain self-interference suppression system, using the method, the system includes:
通信接收机和外围电路，用于将接收电磁频谱伞罩中的信号变换到基带，在数字基带对基带信号的频率偏移、时间延迟、幅度和相位衰减进行估计，并对本地重建干扰信号进行补偿，并完成功分器和合路器对输入信号影响的补偿。The communication receiver and peripheral circuits are used to convert the signal in the receiving electromagnetic spectrum umbrella to baseband, estimate the frequency offset, time delay, amplitude and phase attenuation of the baseband signal at the digital baseband, and perform the local reconstruction interference signal. Compensation, and completes the compensation of the influence of the splitter and combiner on the input signal.
进一步地，所述系统还包括：Further, the system also includes:
通信发射机，用于产生通信信号并进行发射；A communication transmitter for generating and transmitting communication signals;
干扰发射机，用于根据伞罩干扰基带序列产生自干扰信号，并向特定区域进行发射，提高该区域电磁波干扰强度，形成电磁频谱伞罩。The jamming transmitter is used to generate self-jamming signals according to the baseband sequence of the umbrella cover and transmit it to a specific area to improve the electromagnetic wave interference intensity in the area and form an electromagnetic spectrum umbrella cover.
本发明的有益效果是：本发明提供了对接收射频信号的有效处理架构，可以实现将自干扰射频信号抑制到接收通道的动态范围以内，以防止接收通道饱和；伞罩自干扰的抑制不受通信信号的类型制约，可以与任何已有的通信链路相结合，兼容性较强。The beneficial effects of the present invention are as follows: the present invention provides an effective processing structure for the received radio frequency signal, which can suppress the self-interference radio frequency signal within the dynamic range of the receiving channel, so as to prevent the saturation of the receiving channel; the self-interference of the umbrella can be suppressed without The type of communication signal is restricted, it can be combined with any existing communication link, and the compatibility is strong.
附图说明Description of drawings
图1为本发明一示例性实施例的方法流程图；1 is a flow chart of a method according to an exemplary embodiment of the present invention;
图2为本发明一示例性实施例的电磁频谱伞罩射频域自干扰抑制原理；FIG. 2 shows the principle of self-interference suppression in the radio frequency domain of the electromagnetic spectrum umbrella cover according to an exemplary embodiment of the present invention;
图3为本发明一示例性实施例的电磁频谱伞罩射频域自干扰抑制器件影响测量流程；FIG. 3 is a flow of measuring the influence of an electromagnetic spectrum umbrella cover radio frequency domain self-interference suppression device in an exemplary embodiment of the present invention;
图4为本发明一示例性实施例的电磁频谱伞罩射频域自干扰抑制延时器设定流程。FIG. 4 is a flow chart of setting a delayer for self-interference suppression in the radio frequency domain of the electromagnetic spectrum umbrella cover according to an exemplary embodiment of the present invention.
具体实施方式Detailed ways
下面结合附图对本发明的技术方案进行清楚、完整地描述，显然，所描述的实施例是本发明一部分实施例，而不是全部的实施例。基于本发明中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例，都属于本发明保护的范围。The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.
在本申请使用的术语是仅仅出于描述特定实施例的目的，而非旨在限制本申请。在本申请和所附权利要求书中所使用的单数形式的“一种”、“所述”和“该”也旨在包括多数形式，除非上下文清楚地表示其他含义。还应当理解，本文中使用的术语“和/或”是指并包含一个或多个相关联的列出项目的任何或所有可能组合。The terminology used in this application is for the purpose of describing particular embodiments only and is not intended to limit the application. As used in this application and the appended claims, the singular forms "a," "the," and "the" are intended to include the plural forms as well, unless the context clearly dictates otherwise. It will also be understood that the term "and/or" as used herein refers to and includes any and all possible combinations of one or more of the associated listed items.
应当理解，尽管在本申请可能采用术语第一、第二、第三等来描述各种信息，但这些信息不应限于这些术语。这些术语仅用来将同一类型的信息彼此区分开。例如，在不脱离本申请范围的情况下，第一信息也可以被称为第二信息，类似地，第二信息也可以被称为第一信息。取决于语境，如在此所使用的词语“如果”可以被解释成为“在……时”或“当……时”或“响应于确定”。It should be understood that although the terms first, second, third, etc. may be used in this application to describe various information, such information should not be limited by these terms. These terms are only used to distinguish the same type of information from each other. For example, the first information may also be referred to as the second information, and similarly, the second information may also be referred to as the first information without departing from the scope of the present application. Depending on the context, the word "if" as used herein can be interpreted as "at the time of" or "when" or "in response to determining."
本实例性实施例考虑无线通信系统中伞罩射频域自干扰抑制的传输场景，针对加性白高斯噪声无线传播信道。This exemplary embodiment considers the transmission scenario of self-interference suppression in the radio frequency domain of the umbrella cover in the wireless communication system, and is aimed at the wireless propagation channel of additive white Gaussian noise.
具体地，在加性白高斯噪声无线自干扰信道中，本示例性实施例提出的一种电磁频谱伞罩射频域自干扰抑制方法在指定区域可以干扰非法通信，同时根据干扰特征在本地重建并抵消干扰，以保证己方正常通信的集干扰与通信为一体。Specifically, in an additive white Gaussian noise wireless self-interference channel, a method for suppressing self-interference in the radio frequency domain of an electromagnetic spectrum umbrella proposed by this exemplary embodiment can interfere with illegal communication in a designated area, and at the same time reconstruct and reconstruct locally according to the interference characteristics. Offset the interference to ensure that the interference and communication of the normal communication of one's own side are integrated.
参见图1，图1是本申请一示例性实施例示出的一种电磁频谱伞罩射频域自干扰抑制方法，该方法基于通信接收机和外围电路，所述外围电路包括接收天线、功分器、延时器、合路器、衰减器和放大器；其中，外围电路与通信接收机的具体连接方式如图2所示，具体如下所示：Referring to FIG. 1, FIG. 1 shows a method for suppressing self-interference in the radio frequency domain of an electromagnetic spectrum umbrella according to an exemplary embodiment of the present application. The method is based on a communication receiver and a peripheral circuit, and the peripheral circuit includes a receiving antenna and a power divider. , delayer, combiner, attenuator and amplifier; among them, the specific connection method between the peripheral circuit and the communication receiver is shown in Figure 2, and the details are as follows:
接收天线的输出端与功分器连接，功分器的两个输出端分别与衰减器和延时器连接，衰减器的输出端与通信接收机的第一输入端连接，延时器的输出端与合路器的第一输入端连接，放大器的输入端与通信接收机的输出端连接，放大器的输出端与合路器的第二输入端连接，合路器的输出端与通信接收机的第二输入端连接，通信接收机的第一输入端和第一输出端之间顺次连接有第一信号转换模块、干扰信号重建模块和第二信号转换模块，通信接收机的第二输入端连接有数字域处理模块。The output end of the receiving antenna is connected to the power divider, the two output ends of the power divider are respectively connected to the attenuator and the delay device, the output end of the attenuator is connected to the first input end of the communication receiver, and the output end of the delay device is connected to the first input end of the communication receiver. The terminal is connected to the first input terminal of the combiner, the input terminal of the amplifier is connected to the output terminal of the communication receiver, the output terminal of the amplifier is connected to the second input terminal of the combiner, and the output terminal of the combiner is connected to the communication receiver. The second input end of the communication receiver is connected with the first input end and the first output end of the communication receiver, and a first signal conversion module, an interference signal reconstruction module and a second signal conversion module are sequentially connected between the first input end and the first output end of the communication receiver. The terminal is connected with a digital domain processing module.
所述方法可包括如下所述步骤：The method may include the steps of:
S1：获取功分器、合路器对输入信号的影响，并设定延时器的延时量。S1: Obtain the influence of the power divider and combiner on the input signal, and set the delay amount of the delay device.
具体地，该步骤分为3个部分，分别需要对功分器、合路器对输入信号的影响进行获取，并设定延时器的延时量，下述分别以S11、S12和S13进行说明。Specifically, this step is divided into 3 parts. It is necessary to obtain the influence of the power divider and the combiner on the input signal respectively, and to set the delay amount of the delay device. The following steps are carried out in S11, S12 and S13 respectively. illustrate.
其中，需要定义的是，在不接功分器、延时器和合路器的情况下，从接收天线A输入任意已知信号RA(t)并从通信接收机的第一输入端进入，经过第一信号转换模块后得到信号RA(n)，即如图3的第一部分所示。Among them, what needs to be defined is that in the case of not connecting the power divider, delayer and combiner, any known signal R A (t) is input from the receiving antenna A and enters from the first input end of the communication receiver, After passing through the first signal conversion module, the signal R A (n) is obtained, as shown in the first part of FIG. 3 .
S11为获取功分器对输入信号的影响，具体地：S11 is to obtain the influence of the power divider on the input signal, specifically:
在不接延时器和合路器的情况下，即如图3的第二部分所示，从接收天线A输入任意已知信号RA(t)，经过功分器分为D、B两路，分别由通信接收机的第一输入端和通信接收机的第二输入端进入通信接收机，并分别经过第一信号转换模块和与第一信号转模块相同的第三信号转换模块，得到两路信号分别为RB(n)和RD(n)。In the case of not connecting the delay device and the combiner, that is, as shown in the second part of Figure 3, input any known signal R A (t) from the receiving antenna A, and divide it into two channels D and B through the power divider , respectively enter the communication receiver from the first input end of the communication receiver and the second input end of the communication receiver, and pass through the first signal conversion module and the third signal conversion module identical to the first signal conversion module, respectively, to obtain two The channel signals are R B (n) and R D (n), respectively.
功分器的AB支路输入输出信号性能的影响为：The influence of the input and output signal performance of the AB branch of the power divider is:
其中，ηAB为AB支路输入信号的幅度变化量，θAB为AB支路输入信号的相位变化量；Wherein, η AB is the amplitude variation of the AB branch input signal, and θ AB is the phase variation of the AB branch input signal;
功分器的AD支路输入输出信号性能的影响为：The influence of the input and output signal performance of the AD branch of the power divider is:
其中，ηAD为AD支路输入信号的幅度变化量，θAD为AD支路输入信号的相位变化量。Among them, η AD is the amplitude variation of the AD branch input signal, and θ AD is the phase variation of the AD branch input signal.
而功分器的AB支路和AD支路的性能差异为：The performance difference between the AB branch and the AD branch of the power divider is:
其中，ηBD为信号AB支路和AD支路的幅度差异，θBD分别为信号AB支路和AD支路的相位差异。Among them, η BD is the amplitude difference between the signal AB branch and AD branch, and θ BD is the phase difference between the signal AB branch and AD branch, respectively.
S12为获取合路器对输入信号的影响，具体地：S12 is to obtain the influence of the combiner on the input signal, specifically:
在不接功分器和延时器的情况下，即如图3的第三部分所示，将合路器的第二输入端E空置，从合路器的第一输入端C输入任意已知信号RA(t)，合路器的输出端J从通信接收机的第一输入端进入，经过第一信号转换模块后得到信号RC(n)，则合路器CJ支路输入输出信号的性能差异为
在不接功分器和延时器的情况下，将合路器的第一输入端C空置，从合路器的第二输入端E输入任意已知信号RA(t)，合路器的输出端J从通信接收机的第一输入端进入，经过第一信号转换模块后得到信号RE(n)，则合路器EJ支路输入输出信号的性能差异为
则合路器CJ支路和EJ支路的性能差异为
步骤S13为设定延时器的延时量，如图4所示，具体地：Step S13 is to set the delay amount of the delay device, as shown in FIG. 4 , specifically:
获取位于功分器的第一输出端D处信号rD(t)经通信接收机处理后得到的位于合路器的第二输入端E处重建信号
根据所述处理时间延迟τDE，在延时器中对功分器的第二输出端B处信号进行时延补偿According to the processing time delay τ DE , delay compensation is performed on the signal at the second output end B of the power divider in the delay device
S2：接收天线接收包括通信信号和自干扰信号在内的射频信号，所述射频信号通过功分器的第一输出端和衰减器发送至通信接收机的第一输入端，同时通过功分器的第二输出端和延时器发送至合路器的第一输入端；所述自干扰信号为根据伞罩干扰基带序列y(n)产生的信号。S2: The receiving antenna receives the radio frequency signal including the communication signal and the self-interference signal, the radio frequency signal is sent to the first input end of the communication receiver through the first output end of the power divider and the attenuator, and at the same time passes through the power divider The second output end of , and the delay device are sent to the first input end of the combiner; the self-interference signal is a signal generated according to the canopy interference baseband sequence y(n).
该部分包括两个部分：This section consists of two parts:
(1)第一部分为通过功分器的第一输出端D和衰减器传输至通信接收机的第一输入端，具体地，在该步骤中：(1) The first part is transmitted to the first input end of the communication receiver through the first output end D of the power divider and the attenuator, specifically, in this step:
所述的接收天线接收包括通信信号和自干扰信号在内的射频信号中，射频信号RA(t)为：In the radio frequency signal received by the receiving antenna including the communication signal and the self-interference signal, the radio frequency signal R A (t) is:
其中rS(t)为接收射频信号中有用信号部分即通信信号；n(t)为加性噪声部分；剩余部分为射频干扰信号部分即自干扰信号，包含了干扰信号y(t)，时变的频偏Δf(t)、时延τ(t)、幅度变化η(t)和相位变化θ(t)；fc为射频干扰信号的载波频率；Among them, r S (t) is the useful signal part of the received radio frequency signal, that is, the communication signal; n (t) is the additive noise part; the remaining part is the radio frequency interference signal part, that is, the self-interference signal, including the interference signal y(t), when Variable frequency offset Δf(t), time delay τ(t), amplitude change η(t) and phase change θ(t); f c is the carrier frequency of the radio frequency interference signal;
所述射频信号通过功分器的第一输出端D后，D端信号为：After the radio frequency signal passes through the first output end D of the power divider, the signal at the D end is:
D端信号送至β倍衰减器，将信号抑制到接收通道的动态范围以内。The D-terminal signal is sent to the beta-time attenuator to suppress the signal within the dynamic range of the receiving channel.
(2)第二个部分为通过功分器的第二输出端B和延时器传输至合路器的第一输入端C，具体地，在该步骤中：(2) The second part is to transmit to the first input end C of the combiner through the second output end B of the power divider and the delay device, specifically, in this step:
功分器的第二输出端B的实时信号为：The real-time signal of the second output B of the power divider is:
B端信号经延时器后得到合路器的第一输入端C端信号：After the B-terminal signal passes through the delayer, the C-terminal signal of the first input terminal of the combiner is obtained:
在延时器中对B端信号进行时延补偿，以保证C、E两端的信号同步。The delay compensation is performed on the signal at the B end in the delay device to ensure the synchronization of the signals at the C and E ends.
S3：第一信号转换模块对通过通信接收机的第一输入端进入的信号进行转换后发送至干扰信号重建模块；干扰信号重建模块从频率、时间、幅度、相位四个维度对本地重建干扰信号进行补偿，同时根据所述影响对补偿后的重建干扰信号进行功分器补偿和合路器补偿；第二信号转换模块将补偿完成后的信号通过通信接收机的输出端和放大器输入至合路器的第二输入端。S3: The first signal conversion module converts the signal entered through the first input end of the communication receiver and sends it to the interference signal reconstruction module; the interference signal reconstruction module reconstructs the local interference signal from the four dimensions of frequency, time, amplitude and phase Compensation is performed, and at the same time, power divider compensation and combiner compensation are performed on the compensated reconstructed interference signal according to the influence; the second signal conversion module inputs the compensated signal to the combiner through the output end of the communication receiver and the amplifier of the second input.
具体地，在该步骤中，具体包括以下步骤：Specifically, in this step, the following steps are specifically included:
S31：进入通信接收机的第一输入端，经第一信号转换模块处理后，第一信号转换模的输出端H输出的信号序列为：S31: Entering the first input terminal of the communication receiver, after being processed by the first signal conversion module, the signal sequence output by the output terminal H of the first signal conversion module is:
其中，
S32：对rH(n)进行频偏、时延、幅度和相位变化参数估计，记频偏估计值为
S33：利用估计值对重建干扰信号进行补偿，补偿后的重建干扰信号为：S33: Compensate the reconstructed interference signal by using the estimated value, and the reconstructed interference signal after compensation is:
S34：对补偿后得到的信号
S35：对补偿后得到的信号
S36：完成对重建干扰信号的补偿的信号
S37：经与β倍衰减器对应的β倍放大器后，合路器的第二输入端E处信号表示为：S37: After the β-fold amplifier corresponding to the β-fold attenuator, the signal at the second input end E of the combiner is expressed as:
S4：合路器将两路信号合成后得到射频干扰抵消后的信号，并输入至通信接收机的第二输入端进行后续处理。S4: The combiner obtains a signal after radio frequency interference cancellation after synthesizing the two signals, and inputs the signal to the second input end of the communication receiver for subsequent processing.
具体地，在该步骤中：Specifically, in this step:
合路器的第一输入端C和合路器的第二输入端E经过合路后，输出合路器的输出端J的信号，表示为：After the first input terminal C of the combiner and the second input terminal E of the combiner are combined, the signal of the output terminal J of the combiner is output, which is expressed as:
其中：in:
式中，rJ(t)为对接收射频信号rA(t)进行射频干扰抵消后的信号。In the formula, r J (t) is the signal after the radio frequency interference cancellation is performed on the received radio frequency signal r A (t).
更优地，在本实施例中，所述后续处理包括将抑制后的信号rJ(t)变换为数字域后进一步进行处理。More preferably, in this embodiment, the subsequent processing includes further processing after transforming the suppressed signal r J (t) into the digital domain.
更优地，在本实施例中，所述第一信号转换模块包括顺次连接的模数转换器ADC、数字下变频DDC和成型滤波器；所述第二信号转换模块包括顺次连接的成型滤波器、数字上变频DUC和数模转换器DAC。More preferably, in this embodiment, the first signal conversion module includes an analog-to-digital converter ADC, a digital down-conversion DDC, and a shaping filter connected in sequence; the second signal conversion module includes a shaping filter connected in sequence. Filters, digital up-conversion DUCs, and digital-to-analog converter DACs.
更优地，在本实施例中，所述通信信号由外部通信发射机产生，经过成型滤波器、数字上变频DUC和数模转换器DAC后发射；所述自干扰信号由外部干扰发射机根据伞罩干扰基带序列y(n)产生，经过成型滤波器、数字上变频DUC和数模转换器DAC后发射。More preferably, in this embodiment, the communication signal is generated by an external communication transmitter, and then transmitted through a shaping filter, a digital up-conversion DUC and a digital-to-analog converter DAC; Umbrella jamming baseband sequence y(n) is generated and transmitted after shaping filter, digital up-conversion DUC and digital-to-analog converter DAC.
本发明的又一示例性实施例，提供一种电磁频谱伞罩射频域自干扰抑制系统，采用上述示例性实施例中所述的方法，所述系统包括：Yet another exemplary embodiment of the present invention provides an electromagnetic spectrum umbrella cover radio frequency domain self-interference suppression system, using the method described in the above exemplary embodiment, the system includes:
通信接收机和外围电路，用于将接收电磁频谱伞罩中的信号变换到基带，在数字基带对基带信号的频率偏移、时间延迟、幅度和相位衰减进行估计，并对本地重建干扰信号进行补偿，并完成功分器和合路器对输入信号影响的补偿。The communication receiver and peripheral circuits are used to convert the signal in the receiving electromagnetic spectrum umbrella to baseband, estimate the frequency offset, time delay, amplitude and phase attenuation of the baseband signal at the digital baseband, and perform the local reconstruction interference signal. Compensation, and completes the compensation of the influence of the splitter and combiner on the input signal.
更优地，在本实施例中，所述系统还包括：More preferably, in this embodiment, the system further includes:
通信发射机，用于产生通信信号并进行发射；A communication transmitter for generating and transmitting communication signals;
干扰发射机，用于根据伞罩干扰基带序列产生自干扰信号，并向特定区域进行发射，提高该区域电磁波干扰强度，形成电磁频谱伞罩。The jamming transmitter is used to generate self-jamming signals according to the baseband sequence of the umbrella cover and transmit it to a specific area to improve the electromagnetic wave interference intensity in the area and form an electromagnetic spectrum umbrella cover.
显然，上述实施例仅仅是为清楚地说明所作的举例，而并非对实施方式的限定，对于所属领域的普通技术人员来说，在上述说明的基础上还可以做出其他不同形式的变化或变动。这里无需也无法对所有的实施方式予以穷举。而由此所引申出的显而易见的变化或变动仍处于本发明创造的保护范围之中。Obviously, the above embodiments are only examples for clear description, rather than limitations on the implementation manner. For those of ordinary skill in the art, on the basis of the above descriptions, other different forms of changes or modifications can also be made . There is no need and cannot be exhaustive of all implementations here. However, the obvious changes or changes derived from this are still within the protection scope of the present invention.
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| US10243719B2 (en) * | 2011-11-09 | 2019-03-26 | The Board Of Trustees Of The Leland Stanford Junior University | Self-interference cancellation for MIMO radios |
| CN104168234A (en) * | 2013-05-16 | 2014-11-26 | 中兴通讯股份有限公司 | Signal cancelling method and apparatus of wireless communication system |
| CN104954307A (en) * | 2015-05-21 | 2015-09-30 | 电子科技大学 | Same-time and same-frequency full-duplex limitation self-interference cancelling system |
| CN106341157A (en) * | 2016-09-12 | 2017-01-18 | 电子科技大学 | Simultaneous, cofrequency and full-duplex radio-frequency-domain rapid self-interference suppression system and method thereof |
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