CN115473543B - Same-frequency self-interference elimination device and method suitable for independent receiving and transmitting antenna architecture - Google Patents
Same-frequency self-interference elimination device and method suitable for independent receiving and transmitting antenna architecture Download PDFInfo
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Abstract
本发明涉及一种适用于独立收发天线架构的同频自干扰消除装置及方法，包括自干扰信号重构单元和自干扰消除单元，发射机输出的射频信号分为两路，一路发送至通信发射天线用于对外发射，另一路发送至自干扰信号重构单元；自干扰信号重构单元采用一组自干扰重构收发天线生成同频干扰信号样本输送至自干扰消除单元；自干扰消除单元利用接收的同频干扰信号样本生成与自干扰信号等幅、反相的抵消信号，实现对自干扰信号的干扰消除；本发明自干扰信号样本既包含了线性自干扰成分，又包含了由天线导致的无源互调自干扰成分，因此利用此样本信号生成的反相抵消信号，可以同时对这两部分自干扰信号进行抵消，提升了消除性能。
The present invention relates to a same-frequency self-interference elimination device and method suitable for an independent transceiver antenna structure, including a self-interference signal reconstruction unit and a self-interference elimination unit. The radio frequency signal output by a transmitter is divided into two paths, and one path is sent to the communication transmitter The antenna is used for external transmission, and the other channel is sent to the self-interference signal reconstruction unit; the self-interference signal reconstruction unit uses a group of self-interference reconstruction transceiver antennas to generate co-channel interference signal samples and sends them to the self-interference elimination unit; the self-interference elimination unit uses The received co-channel interference signal sample generates a cancellation signal with the same amplitude and anti-phase as the self-interference signal, so as to realize the interference elimination of the self-interference signal; the self-interference signal sample of the present invention includes both the linear self-interference component and the self-interference caused by the antenna. The passive intermodulation self-interference component of the sample signal, so the anti-phase cancellation signal generated by this sample signal can cancel the two parts of the self-interference signal at the same time, which improves the cancellation performance.
Description
技术领域technical field
本发明涉及一种适用于独立收发天线架构的同频自干扰消除装置及消除方法，属于无线通信技术领域。The invention relates to a same-frequency self-interference elimination device and elimination method applicable to an independent transceiver antenna architecture, and belongs to the technical field of wireless communication.
背景技术Background technique
目前常用的无线双工通信方式有时分双工与频分双工，时分双工是在不同的时间间隔分别传输上行数据与下行数据，频分双工是采用不同的无线频段分别传输上行数据与下行数据。显而易见，如果使用同时同频的方式进行全双工传输，理论上可以使频谱利用率倍增，由于目前无线通信频谱资源愈发紧张，使同时同频全双工技术具有非常好的应用前景。同时同频全双工技术实现的难点在于，发射信号的时候会对自身接收端造成强大的同频干扰，使远端同频有用信号被淹没，无法有效的接收。因此，同时同频全双工实现的前提也是核心难点为同频自干扰消除。Currently commonly used wireless duplex communication methods are time division duplex and frequency division duplex. Time division duplex transmits uplink data and downlink data at different time intervals, and frequency division duplex uses different wireless frequency bands to transmit uplink data and downlink data. Obviously, if full-duplex transmission is performed at the same frequency at the same time, the spectrum utilization can be doubled theoretically. Due to the increasingly tight spectrum resources of wireless communication, the full-duplex technology at the same time and the same frequency has a very good application prospect. At the same time, the difficulty in realizing the same-frequency full-duplex technology is that when transmitting signals, it will cause strong same-frequency interference at the receiving end, so that the useful signals of the same frequency at the far end will be submerged and cannot be effectively received. Therefore, the premise and core difficulty of simultaneous co-frequency full-duplex implementation is co-frequency self-interference cancellation.
对于独立收发天线架构，如果要实现同频干扰消除，现有的一种方法是将进入发射天线之前的信号分为两路，一路送到发射天线进行发射，另一路通过特定的电路进行幅度相位调整，生成与接收天线耦合到的同频自干扰信号等幅、反相的抵消信号，将这个抵消信号与天线接收到的同频自干扰信号相加，就实现了同频自干扰消除。该方法是将送给发射天线的信号耦合出一部分作为样本信号，存在以下问题：实际的天线由于制造工艺等因素，并非理想的线性器件，在大功率系统中，天线的非线性因素会导致高次谐波的产生，也就是无源互调成分。进而导致自身接收天线耦合到的自干扰信号中也含有这些无源互调成分。传统方案中，用于构建反相抵消信号的样本信号是从发射天线之前获取，并不含有这些无源互调成分，因此该方法无法有效应对由天线无源互调导致的非线性自干扰成分。For the independent transceiver antenna architecture, if co-channel interference elimination is to be achieved, an existing method is to divide the signal before entering the transmitting antenna into two channels, one is sent to the transmitting antenna for transmission, and the other is through a specific circuit for amplitude phase Adjust to generate a cancellation signal with the same amplitude and opposite phase as the same-frequency self-interference signal coupled to the receiving antenna, and add this cancellation signal to the same-frequency self-interference signal received by the antenna to realize the same-frequency self-interference cancellation. This method is to couple a part of the signal sent to the transmitting antenna as a sample signal, which has the following problems: the actual antenna is not an ideal linear device due to factors such as manufacturing process, and in a high-power system, the nonlinear factors of the antenna will lead to high Generation of sub-harmonics, that is, passive intermodulation components. In turn, the self-interference signal coupled to the own receiving antenna also contains these passive intermodulation components. In the traditional scheme, the sample signal used to construct the anti-phase cancellation signal is obtained from before the transmitting antenna and does not contain these passive intermodulation components, so this method cannot effectively deal with the nonlinear self-interference components caused by antenna passive intermodulation .
发明内容Contents of the invention
本发明的目的在于克服现有技术的上述缺陷，提供一种适用于独立收发天线架构的同频自干扰消除装置及消除方法，通过构建自干扰信号重构单元和自干扰消除单元，实现自干扰信号的干扰消除，得到无干扰的有用信号。The purpose of the present invention is to overcome the above-mentioned defects of the prior art, to provide a same-frequency self-interference elimination device and elimination method suitable for independent transceiver antenna architecture, and to realize self-interference by constructing a self-interference signal reconstruction unit and a self-interference elimination unit The interference of the signal is eliminated, and a useful signal without interference is obtained.
本发明的上述目的主要是通过如下技术方案予以实现的：Above-mentioned purpose of the present invention is mainly achieved through the following technical solutions:
一种适用于独立收发天线架构的同频自干扰消除装置，所述独立收发天线架构包括接收机、发射机、通信发射天线和通信接收天线，所述同频自干扰消除装置包括自干扰信号重构单元和自干扰消除单元；A co-frequency self-interference canceling device suitable for an independent transceiver antenna architecture, the independent transceiving antenna architecture includes a receiver, a transmitter, a communication transmitting antenna and a communication receiving antenna, the co-frequency self-interference canceling device includes a self-interference signal re- Structural unit and self-interference cancellation unit;
发射机输出的射频信号分为两路，一路发送至通信发射天线用于对外发射，另一路发送至自干扰信号重构单元；The radio frequency signal output by the transmitter is divided into two channels, one is sent to the communication transmitting antenna for external transmission, and the other is sent to the self-interference signal reconstruction unit;
自干扰信号重构单元，接收所述射频信号，采用一组自干扰重构收发天线生成同频干扰信号样本输送至自干扰消除单元；The self-interference signal reconstruction unit receives the radio frequency signal, uses a group of self-interference reconstruction transceiver antennas to generate co-frequency interference signal samples and sends them to the self-interference elimination unit;
自干扰消除单元，通过通信接收天线接收通信发射天线发射的射频信号，作为自干扰信号，利用接收的同频干扰信号样本生成与自干扰信号等幅、反相的抵消信号，实现对自干扰信号的干扰消除，并将干扰消除后的有用信号发送至接收机。The self-interference elimination unit receives the radio frequency signal transmitted by the communication transmitting antenna through the communication receiving antenna as a self-interference signal, and uses the received same-frequency interference signal sample to generate a cancellation signal of equal amplitude and anti-phase with the self-interference signal to realize self-interference signal The interference is eliminated, and the useful signal after interference elimination is sent to the receiver.
在上述适用于独立收发天线架构的同频自干扰消除装置中，所述自干扰信号重构单元包含的一组自干扰重构收发天线为自干扰重构发射天线和自干扰重构接收天线，发射机输出的另一路射频信号输送至自干扰重构发射天线，经自干扰重构发射天线发射的射频信号在不存在电磁波干扰的环境中耦合到自干扰重构接收天线，作为同频干扰信号样本输送至自干扰消除单元。In the above-mentioned same-frequency self-interference cancellation device applicable to independent transceiver antenna architecture, the self-interference reconfiguration transceiver antenna included in the self-interference signal reconstruction unit is a self-interference reconfiguration transmitting antenna and a self-interference reconfiguration receiving antenna, The other radio frequency signal output by the transmitter is sent to the self-interference reconstruction transmitting antenna, and the radio frequency signal transmitted by the self-interference reconstruction transmitting antenna is coupled to the self-interference reconstruction receiving antenna in an environment without electromagnetic wave interference as the same-frequency interference signal The sample is delivered to the self-interference cancellation unit.
在上述适用于独立收发天线架构的同频自干扰消除装置中，所述自干扰信号重构单元还包括微波暗箱，自干扰重构发射天线和自干扰重构接收天线安装在微波暗箱内，所述微波暗箱屏蔽外界电磁波，内部不反射电磁波。In the above-mentioned same-frequency self-interference elimination device applicable to independent transceiver antenna architecture, the self-interference signal reconstruction unit also includes a microwave dark box, and the self-interference reconstruction transmitting antenna and the self-interference reconstruction receiving antenna are installed in the microwave dark box. The microwave obscura shields external electromagnetic waves and does not reflect electromagnetic waves inside.
在上述适用于独立收发天线架构的同频自干扰消除装置中，所述自干扰信号重构单元还包括功分器，发射机输出的射频信号通过功分器的两个输出端分别输送至通信发射天线和自干扰重构发射天线。In the above-mentioned same-frequency self-interference cancellation device suitable for independent transceiver antenna architecture, the self-interference signal reconstruction unit also includes a power divider, and the radio frequency signal output by the transmitter is respectively sent to the communication channel through the two output ends of the power divider. Transmit antenna and self-interference reconstruction transmit antenna.
在上述适用于独立收发天线架构的同频自干扰消除装置中，所述发射机输出的射频信号分为两路相同的信号，一路发送至通信发射天线用于对外发射，另一路发送至自干扰信号重构单元。In the above-mentioned same-frequency self-interference elimination device suitable for independent transceiver antenna architecture, the radio frequency signal output by the transmitter is divided into two identical signals, one is sent to the communication transmitting antenna for external transmission, and the other is sent to the self-interference Signal reconstruction unit.
在上述适用于独立收发天线架构的同频自干扰消除装置中，所述自干扰重构发射天线与通信发射天线的性能参数一致，所述自干扰重构接收天线与通信接收天线性的性能参数一致。In the same-frequency self-interference cancellation device applicable to an independent transceiver antenna architecture, the performance parameters of the self-interference reconfiguration transmitting antenna are consistent with those of the communication transmitting antenna, and the performance parameters of the self-interference reconfiguration receiving antenna and the communication receiving antenna are unanimous.
在上述适用于独立收发天线架构的同频自干扰消除装置中，所述自干扰消除单元包括幅度相位调整单元、合路器、耦合器和反馈控制单元；其中：In the same-frequency self-interference cancellation device applicable to independent transceiver antenna architecture, the self-interference cancellation unit includes an amplitude and phase adjustment unit, a combiner, a coupler, and a feedback control unit; wherein:
幅度相位调整单元，接收反馈控制单元发送的幅度调整参数和相位调整参数，根据所述幅度调整参数和相位调整参数对从自干扰信号重构单元接收的同频干扰信号样本进行幅度和相位调整，生成与通信接收天线接收的自干扰信号等幅、反相的抵消信号，发送至合成器；The amplitude and phase adjustment unit receives the amplitude adjustment parameters and phase adjustment parameters sent by the feedback control unit, and performs amplitude and phase adjustment on the same-frequency interference signal samples received from the self-interference signal reconstruction unit according to the amplitude adjustment parameters and phase adjustment parameters, Generate a cancellation signal with the same amplitude and anti-phase as the self-interference signal received by the communication receiving antenna, and send it to the synthesizer;
合成器，将从通信接收天线接收的自干扰信号与从幅度相位调整单元接收的抵消信号相加，同频干扰信号被反相抵消，得到干扰消除后的有用信号发送至耦合器；The synthesizer adds the self-interference signal received from the communication receiving antenna and the cancellation signal received from the amplitude and phase adjustment unit, the same-frequency interference signal is reversed and canceled, and the useful signal obtained after interference cancellation is sent to the coupler;
耦合器，将从合成器接收的有用信号分别输出至接收机和反馈控制单元；The coupler outputs the useful signal received from the synthesizer to the receiver and the feedback control unit respectively;
反馈控制单元，从耦合器接收有用信号，并产生幅度调整参数和相位调整参数，发送至幅度相位调整单元。The feedback control unit receives useful signals from the coupler, generates amplitude adjustment parameters and phase adjustment parameters, and sends them to the amplitude and phase adjustment unit.
一种适用于独立收发天线架构的同频自干扰消除方法，包括：A co-frequency self-interference cancellation method suitable for independent transceiver antenna architecture, comprising:
发射机输出的射频信号分为两路，一路发送至通信发射天线用于对外发射，另一路发送至自干扰信号重构单元；The radio frequency signal output by the transmitter is divided into two channels, one is sent to the communication transmitting antenna for external transmission, and the other is sent to the self-interference signal reconstruction unit;
自干扰信号重构单元接收所述射频信号，采用一组自干扰重构收发天线生成同频干扰信号样本输送至自干扰消除单元；The self-interference signal reconstruction unit receives the radio frequency signal, uses a set of self-interference reconstruction transceiver antennas to generate co-channel interference signal samples and sends them to the self-interference elimination unit;
通信接收天线接收通信发射天线对外发射的射频信号，并发送至自干扰消除单元；The communication receiving antenna receives the radio frequency signal transmitted by the communication transmitting antenna, and sends it to the self-interference elimination unit;
自干扰消除单元将通过通信接收天线接收的射频信号作为自干扰信号，利用从自干扰信号重构单元接收的同频干扰信号样本生成与自干扰信号等幅、反相的抵消信号，实现对自干扰信号的干扰消除，并将干扰消除后的有用信号发送至接收机。The self-interference elimination unit uses the radio frequency signal received by the communication receiving antenna as the self-interference signal, and uses the sample of the same-frequency interference signal received from the self-interference signal reconstruction unit to generate a cancellation signal of equal amplitude and opposite phase to the self-interference signal, so as to achieve self-interference The interference elimination of the interference signal, and the useful signal after the interference elimination is sent to the receiver.
在上述适用于独立收发天线架构的同频自干扰消除方法中，所述自干扰信号重构单元包含自干扰重构发射天线、自干扰重构接收天线、功分器和微波暗箱，自干扰重构发射天线和自干扰重构接收天线安装在微波暗箱内；In the same-frequency self-interference cancellation method applicable to independent transceiver antenna architecture, the self-interference signal reconstruction unit includes a self-interference reconstruction transmitting antenna, a self-interference reconstruction receiving antenna, a power divider, and a microwave camera. The structure transmitting antenna and the self-interference reconstruction receiving antenna are installed in the microwave dark box;
发射机输出的射频信号通过功分器的两个输出端分别输送至通信发射天线和自干扰重构发射天线，经自干扰重构发射天线发射的射频信号在微波暗箱内不存在电磁波干扰的环境中耦合到自干扰重构接收天线，作为同频干扰信号样本由自干扰重构接收天线发送至自干扰消除单元。The radio frequency signal output by the transmitter is sent to the communication transmitting antenna and the self-interference reconstruction transmitting antenna through the two output ends of the power divider, and the radio frequency signal transmitted by the self-interference reconstruction transmitting antenna does not have an environment of electromagnetic wave interference in the microwave dark box coupled to the self-interference reconstruction receiving antenna, and sent to the self-interference cancellation unit by the self-interference reconstruction receiving antenna as co-channel interference signal samples.
在上述适用于独立收发天线架构的同频自干扰消除方法中，所述自干扰消除单元包括幅度相位调整单元、合路器、耦合器和反馈控制单元；其中：In the same-frequency self-interference cancellation method applicable to independent transceiver antenna architecture, the self-interference cancellation unit includes an amplitude and phase adjustment unit, a combiner, a coupler, and a feedback control unit; wherein:
幅度相位调整单元接收反馈控制单元发送的幅度调整参数和相位调整参数，根据所述幅度调整参数和相位调整参数对从自干扰信号重构单元接收的同频干扰信号样本进行幅度和相位调整，生成与通信接收天线接收的自干扰信号等幅、反相的抵消信号，发送至合成器；The amplitude and phase adjustment unit receives the amplitude adjustment parameter and the phase adjustment parameter sent by the feedback control unit, and performs amplitude and phase adjustment on the same-frequency interference signal sample received from the self-interference signal reconstruction unit according to the amplitude adjustment parameter and phase adjustment parameter to generate The cancellation signal with the same amplitude and anti-phase as the self-interference signal received by the communication receiving antenna is sent to the synthesizer;
合成器将从通信接收天线接收的自干扰信号与从幅度相位调整单元接收的抵消信号相加，同频干扰信号被反相抵消，得到干扰消除后的有用信号发送至耦合器；The synthesizer adds the self-interference signal received from the communication receiving antenna and the cancellation signal received from the amplitude and phase adjustment unit, the same-frequency interference signal is reversed and canceled, and the useful signal obtained after interference cancellation is sent to the coupler;
耦合器将从合成器接收的有用信号分别输出至接收机和反馈控制单元；The coupler outputs the useful signal received from the synthesizer to the receiver and the feedback control unit respectively;
反馈控制单元从耦合器接收有用信号，并将产生的幅度调整参数和相位调整参数发送至幅度相位调整单元。The feedback control unit receives useful signals from the coupler, and sends the generated amplitude adjustment parameters and phase adjustment parameters to the amplitude and phase adjustment unit.
一种独立收发天线系统，包括接收机、发射机、通信发射天线、通信接收天线和上述同频自干扰消除装置。An independent transmitting and receiving antenna system includes a receiver, a transmitter, a communication transmitting antenna, a communication receiving antenna and the same-frequency self-interference elimination device.
本发明与现有技术相比至少包含如下有益效果：Compared with the prior art, the present invention at least includes the following beneficial effects:
(1)、本发明适用于独立收发天线架构的同频自干扰消除装置，采用一组独立的自干扰重构收发天线生成同频干扰信号样本，自干扰重构收发天线的参数与通信收发天线性能参数一致，自干扰信号样本含有与通信接收天线耦合到的相同频率成分的自干扰信号，既包含了线性自干扰成分，又包含了由天线导致的无源互调自干扰成分，因此利用此样本信号生成的反相抵消信号，可以同时对这两部分自干扰信号进行抵消，提升了消除性能。(1), the present invention is applicable to the same-frequency self-interference elimination device of the independent transceiver antenna structure, adopts a group of independent self-interference reconstruction transceiver antennas to generate co-frequency interference signal samples, and the parameters of the self-interference reconstruction transceiver antenna and the communication transceiver antenna The performance parameters are consistent, and the self-interference signal sample contains the self-interference signal with the same frequency component coupled to the communication receiving antenna, which includes both the linear self-interference component and the passive intermodulation self-interference component caused by the antenna. Therefore, using this The anti-phase cancellation signal generated by the sample signal can cancel the two parts of the self-interference signal at the same time, thereby improving the cancellation performance.
(2)、本发明优选自干扰消除单元包括幅度相位调整单元、合路器、耦合器和反馈控制单元形成的闭环回路，可以通过不断调整信号的幅度和相位，实现最佳的干扰消除效果。(2), the preferred self-interference elimination unit of the present invention includes a closed-loop loop formed by an amplitude and phase adjustment unit, a combiner, a coupler and a feedback control unit, which can achieve the best interference elimination effect by continuously adjusting the amplitude and phase of the signal.
附图说明Description of drawings
图1为本发明适用于独立收发天线架构的同频自干扰消除装置结构示意图；FIG. 1 is a schematic structural diagram of a same-frequency self-interference cancellation device applicable to an independent transceiver antenna architecture according to the present invention;
其中：100—自干扰信号重构单元、101—功分器、102—微波暗箱、103—自干扰重构发射天线、104—自干扰重构接收天线、200—自干扰消除单元、201—幅度相位调整单元、202—合路器、203—耦合器、204—反馈控制单元、301—通信发射天线、302—通信接收天线；Among them: 100—self-interference signal reconstruction unit, 101—power divider, 102—microwave black box, 103—self-interference reconstruction transmitting antenna, 104—self-interference reconstruction receiving antenna, 200—self-interference cancellation unit, 201—amplitude Phase adjustment unit, 202—combiner, 203—coupler, 204—feedback control unit, 301—communication transmitting antenna, 302—communication receiving antenna;
图2为本发明实施例中适用于独立收发天线架构的同频自干扰消除装置仿真结果示意图。FIG. 2 is a schematic diagram of a simulation result of an intra-frequency self-interference cancellation device applicable to an independent transceiver antenna architecture in an embodiment of the present invention.
具体实施方式Detailed ways
下面结合附图和具体实施例对本发明做进一步详细的描述：Below in conjunction with accompanying drawing and specific embodiment the present invention is described in further detail:
如图1所示为本发明适用于独立收发天线架构的同频自干扰消除装置结构示意图；本发明在独立收发天线架构基础上，实现同频干扰的消除。Figure 1 is a schematic structural diagram of the same-frequency self-interference cancellation device applicable to the independent transceiver antenna architecture of the present invention; the present invention realizes the elimination of the same-frequency interference on the basis of the independent transceiver antenna architecture.
如图1所示，基于环形器的单天线收发架构包括：发射机、通信发射天线301、通信接收天线302以及接收机；本发明适用于独立收发天线架构的同频自干扰消除装置包括：自干扰信号重构单元100以及自干扰消除单元200；As shown in Figure 1, the single-antenna transceiver architecture based on a circulator includes: a transmitter, a communication transmitting antenna 301, a communication receiving antenna 302, and a receiver; the same-frequency self-interference cancellation device applicable to an independent transceiver antenna architecture in the present invention includes: An interference signal reconstruction unit 100 and a self-interference cancellation unit 200;
自干扰信号重构单元100包括：功分器101、微波暗箱102、自干扰重构发射天线103、自干扰重构接收天线104；自干扰重构发射天线103和自干扰重构接收天线104安装在微波暗箱102内，微波暗箱102屏蔽外界电磁波，并且内部不反射电磁波。The self-interference signal reconstruction unit 100 comprises: a power divider 101, a microwave black box 102, a self-interference reconfiguration transmitting antenna 103, a self-interference reconfiguration receiving antenna 104; a self-interference reconfiguration transmitting antenna 103 and a self-interference reconfiguration receiving antenna 104 In the microwave dark box 102, the microwave dark box 102 shields external electromagnetic waves and does not reflect electromagnetic waves inside.
自干扰信号重构单元100接收射频信号，采用一组自干扰重构收发天线生成同频干扰信号样本输送至自干扰消除单元200。自干扰重构接收天线104连接自干扰抵消单元200中幅度相位调整单元201的输入端。经自干扰重构发射天线103发射的射频信号在不存在电磁波干扰的环境中耦合到自干扰重构接收天线104，作为同频干扰信号样本输送至自干扰消除单元。发射机输出的射频信号通过功分器101的两个输出端分别输送至通信发射天线301和自干扰重构发射天线103。The self-interference signal reconstruction unit 100 receives radio frequency signals, uses a group of self-interference reconstruction transceiver antennas to generate co-channel interference signal samples, and sends them to the self-interference cancellation unit 200 . The self-interference reconstruction receiving antenna 104 is connected to the input end of the amplitude and phase adjustment unit 201 in the self-interference cancellation unit 200 . The radio frequency signal transmitted by the self-interference reconstruction transmitting antenna 103 is coupled to the self-interference reconstruction receiving antenna 104 in an environment without electromagnetic wave interference, and sent to the self-interference elimination unit as a co-channel interference signal sample. The radio frequency signal output by the transmitter is respectively sent to the communication transmitting antenna 301 and the self-interference reconstruction transmitting antenna 103 through the two output ends of the power divider 101 .
发射机连接功分器101的输入端，功分器101的两个输出端，分别连接通信发射天线301与自干扰重构发射天线103。发射机输出的射频信号分为两路相同的信号，一路发送至通信发射天线301用于对外发射，另一路发送至自干扰信号重构单元100。The transmitter is connected to the input end of the power splitter 101, and the two output ends of the power splitter 101 are respectively connected to the communication transmitting antenna 301 and the self-interference reconstruction transmitting antenna 103. The radio frequency signal output by the transmitter is divided into two identical signals, one of which is sent to the communication transmitting antenna 301 for external transmission, and the other is sent to the self-interference signal reconstruction unit 100 .
自干扰重构发射天线103与通信发射天线301的性能参数一致，自干扰重构接收天线104与通信接收天线性302的性能参数一致。The self-interference reconfiguration transmitting antenna 103 has the same performance parameters as the communication transmitting antenna 301 , and the self-interference reconfiguration receiving antenna 104 has the same performance parameters as the communication receiving antenna 302 .
如图1所示，自干扰消除单元200包括：幅度相位调整单元201、合路器202、耦合器203以及反馈控制单元204。As shown in FIG. 1 , the self-interference cancellation unit 200 includes: an amplitude and phase adjustment unit 201 , a combiner 202 , a coupler 203 and a feedback control unit 204 .
幅度相位调整单元201用于将自干扰样本信号的幅度相位进行调整，生成与通信接收天线302耦合到的自干扰信号等幅、反相的抵消信号；The amplitude and phase adjustment unit 201 is used to adjust the amplitude and phase of the self-interference sample signal to generate a cancellation signal of equal amplitude and anti-phase with the self-interference signal coupled to the communication receiving antenna 302;
合路器202有两个输入端、一个输出端。两个输入端分别连接幅度相位调整单元201输出端以及通信接收天线302，输出端连接耦合器203。The combiner 202 has two input terminals and one output terminal. The two input ends are respectively connected to the output end of the amplitude and phase adjustment unit 201 and the communication receiving antenna 302 , and the output end is connected to the coupler 203 .
合路器202将来自通信接收天线302的含远端有用信号以及同频自干扰信号的混合信号与来自幅度相位调整单元201的反相抵消信号相加，同频干扰信号被反相抵消，从而得到干扰消除后输出的有用信号。The combiner 202 adds the mixed signal containing the far-end useful signal and the same-frequency self-interference signal from the communication receiving antenna 302 to the anti-phase cancellation signal from the amplitude-phase adjustment unit 201, and the same-frequency interference signal is anti-phase cancellation, thereby Get the useful signal output after the interference is eliminated.
耦合器203有一个输入端、两个输出端。输入端连接合路器202，输出端分别连接接收机与自干扰抵消单元200中的反馈控制单元204。The coupler 203 has one input terminal and two output terminals. The input end is connected to the combiner 202 , and the output end is respectively connected to the receiver and the feedback control unit 204 in the self-interference cancellation unit 200 .
自干扰抵消单元200中的反馈控制单元204输出端连接自干扰抵消单元200中的控制输入端，反馈控制单元204通过检测耦合器203输出的信号功率，对幅度相位调整单元201进行反馈控制，实时调整抵消信号的幅度与相位，以达到最佳抵消性能。The output terminal of the feedback control unit 204 in the self-interference canceling unit 200 is connected to the control input terminal in the self-interference canceling unit 200, and the feedback control unit 204 performs feedback control on the amplitude and phase adjustment unit 201 by detecting the signal power output by the coupler 203, in real time Adjust the amplitude and phase of the cancellation signal to achieve the best cancellation performance.
具体地，自干扰消除单元200中各单元的功能如下：Specifically, the functions of each unit in the self-interference cancellation unit 200 are as follows:
幅度相位调整单元201，接收反馈控制单元204发送的幅度调整参数和相位调整参数，根据幅度调整参数和相位调整参数对从自干扰信号重构单元100接收的同频干扰信号样本进行幅度和相位调整，生成与通信接收天线302接收的自干扰信号等幅、反相的抵消信号，发送至合成器202。The amplitude and phase adjustment unit 201 receives the amplitude adjustment parameter and the phase adjustment parameter sent by the feedback control unit 204, and adjusts the amplitude and phase of the co-channel interference signal sample received from the interference signal reconstruction unit 100 according to the amplitude adjustment parameter and the phase adjustment parameter , generate a cancellation signal with the same amplitude and opposite phase as the self-interference signal received by the communication receiving antenna 302 , and send it to the combiner 202 .
合成器202，将从通信接收天线302接收的自干扰信号与从幅度相位调整单元201接收的抵消信号相加，同频干扰信号被反相抵消，得到干扰消除后的有用信号发送至耦合器203。The synthesizer 202 adds the self-interference signal received from the communication receiving antenna 302 and the cancellation signal received from the amplitude and phase adjustment unit 201, and the interference signal of the same frequency is reversed and canceled, and the useful signal obtained after interference cancellation is sent to the coupler 203 .
耦合器203，将从合成器202接收的有用信号分别输出至接收机和反馈控制单元204。The coupler 203 outputs the useful signal received from the synthesizer 202 to the receiver and the feedback control unit 204 respectively.
反馈控制单元204，从耦合器203接收的有用信号，产生幅度调整参数和相位调整参数，发送至幅度相位调整单元201。The feedback control unit 204 generates amplitude adjustment parameters and phase adjustment parameters from the useful signal received by the coupler 203 and sends them to the amplitude and phase adjustment unit 201 .
反馈控制单元204收到信号y(t)，通过检波电路检测y(t)的电压值。幅度调整参数和相位调整参数初始值为设定值，反馈控制单元204将幅度调整参数和相位调整参数按照设定的步进值调整后发送至幅度相位调整单元201，数据循环发送中，若反馈控制单元204再次从耦合器203接收的有用信号y(t)小于上一次接收的有用信号y(t)，则步进调整策略正确，继续按照上一次的步进值调整幅度调整参数和相位调整参数。否则，若反馈控制单元204再次从耦合器203接收的有用信号y(t)大于或等于上一次接收的有用信号y(t)，则改变步进调整策略，按照设定的步进值进行反方向变化(例如原来增加，现在减小)，最终目标是寻找最小y(t)。The feedback control unit 204 receives the signal y(t), and detects the voltage value of y(t) through the detection circuit. The initial value of the amplitude adjustment parameter and the phase adjustment parameter is the set value, and the feedback control unit 204 adjusts the amplitude adjustment parameter and the phase adjustment parameter according to the set step value and then sends it to the amplitude and phase adjustment unit 201. During the data cyclic transmission, if the feedback The useful signal y(t) received by the control unit 204 from the coupler 203 is smaller than the useful signal y(t) received last time, then the step adjustment strategy is correct, and the amplitude adjustment parameter and phase adjustment will continue to be adjusted according to the last step value parameter. Otherwise, if the useful signal y(t) received by the feedback control unit 204 from the coupler 203 is greater than or equal to the useful signal y(t) received last time, then the step adjustment strategy is changed, and the feedback is performed according to the set step value. The direction changes (for example, it was increasing, but now it is decreasing), and the ultimate goal is to find the minimum y(t).
如图1所示，从发射机输出的发射信号X(t)经过功分器101分为两路相同的信号x(t)以及x'(t)，x(t)＝x'(t)，x(t)输入通信发射天线301用于发射，x'(t)输入干自扰信号重构单元100用于生成同频干扰样本信号；As shown in Figure 1, the transmission signal X(t) output from the transmitter is divided into two identical signals x(t) and x'(t) through a power divider 101, x(t)=x'(t) , x(t) is input into the communication transmitting antenna 301 for transmission, and x'(t) is input into the interference self-interference signal reconstruction unit 100 for generating co-channel interference sample signals;
通信接收天线302的输出信号r(t)如式(1)所示：The output signal r(t) of the communication receiving antenna 302 is shown in formula (1):
r(t)＝a0x(t-Δt0)+b0w(t)+u(t) (1)r(t)＝a 0 x(t-Δt 0 )+b 0 w(t)+u(t) (1)
其中，a0x(t-Δt0)为通信接收天线302耦合到的来自通信发射天线301的同频自干扰信号，属于同频自干扰信号的线性分量，仅幅度、相位不同；w(t)为发射信号经由通信发射天线后产生的无源互调成分，属于同频自干扰信号的非线性分量；u(t)为通信接收天线302接收到的来自其他无线设备的有用信号；Among them, a 0 x(t-Δt 0 ) is the same-frequency self-interference signal from the communication transmitting antenna 301 coupled to the communication receiving antenna 302, which belongs to the linear component of the same-frequency self-interference signal, and only the amplitude and phase are different; w(t ) is the passive intermodulation component generated after the transmitted signal passes through the communication transmitting antenna, which belongs to the nonlinear component of the same-frequency self-interference signal; u(t) is the useful signal received by the communication receiving antenna 302 from other wireless devices;
自干扰重构发射天线103的参数与通信发射天线301性能参数一致，自干扰重构接收天线104的参数与通信接收天线302性能参数一致，且自干扰重构发射天线103与自干扰重构接收天线104均安装在微波暗箱102内，不接收外部电磁信号，而且微波暗箱内部无电磁反射，因此从自干扰信号重构单元100的自干扰重构接收天线104输出的信号r'(t)仅包含同频自干扰信号成分，包括线性分量以及非线性分量，如式(2)所示：The parameters of the self-interference reconstruction transmitting antenna 103 are consistent with the performance parameters of the communication transmission antenna 301, the parameters of the self-interference reconstruction reception antenna 104 are consistent with the performance parameters of the communication reception antenna 302, and the self-interference reconstruction transmission antenna 103 is consistent with the self-interference reconstruction reception The antennas 104 are all installed in the microwave dark box 102, do not receive external electromagnetic signals, and there is no electromagnetic reflection inside the microwave dark box, so the signal r'(t) output from the self-interference reconstruction receiving antenna 104 of the self-interference signal reconstruction unit 100 is only Contains the same frequency self-interference signal components, including linear components and nonlinear components, as shown in formula (2):
r'(t)＝a1x'(t-Δt1)+b1w(t) (2)r'(t)=a 1 x'(t-Δt 1 )+b 1 w(t) (2)
以r'(t)作为参考信号，输入自干扰消除单元200，经过自干扰消除单元200的幅度相位调整单元201进行幅度相位调整，得到与同频自干扰信号等幅、反相的抵消信号c(t)，c(t)如式(3)所示：Taking r'(t) as a reference signal, it is input into the self-interference canceling unit 200, and the amplitude and phase adjustment is performed through the amplitude and phase adjustment unit 201 of the self-interference canceling unit 200 to obtain a canceling signal c of equal amplitude and opposite phase to the same-frequency self-interference signal (t), c(t) as shown in formula (3):
c(t)＝-[a0x(t-Δt0)+b0w(t)] (3)c(t)=-[a 0 x(t-Δt 0 )+b 0 w(t)] (3)
经过合路器202的相加抵消，最终得到消除同频干扰信号后的信号y(t)，如式(4)所示：After adding and canceling by the combiner 202, the signal y(t) after eliminating the co-channel interference signal is finally obtained, as shown in formula (4):
y(t)＝r(t)+c(t)＝u(t) (4)y(t)=r(t)+c(t)=u(t) (4)
反馈控制单元204通过耦合器203检测y(t)信号功率值，实时调整自干扰消除单元200的幅度相位调整单元201，实现最佳消除效果。The feedback control unit 204 detects the y(t) signal power value through the coupler 203, and adjusts the amplitude and phase adjustment unit 201 of the self-interference canceling unit 200 in real time to achieve the best canceling effect.
本发明适用于独立收发天线架构的同频自干扰消除方法，包括如下步骤：The present invention is applicable to the same-frequency self-interference elimination method of an independent transceiver antenna architecture, including the following steps:
1、发射机输出的射频信号分为两路，一路发送至通信发射天线301用于对外发射，另一路发送至自干扰信号重构单元；1. The radio frequency signal output by the transmitter is divided into two channels, one is sent to the communication transmitting antenna 301 for external transmission, and the other is sent to the self-interference signal reconstruction unit;
2、自干扰信号重构单元100接收所述射频信号，采用一组自干扰重构收发天线生成同频干扰信号样本输送至自干扰消除单元200；2. The radio frequency signal is received by the self-interference signal reconstruction unit 100, and a group of self-interference reconstruction transceiver antennas are used to generate co-channel interference signal samples and sent to the self-interference elimination unit 200;
3、通信接收天线302接收通信发射天线301对外发射的射频信号，并发送至自干扰消除单元200；3. The communication receiving antenna 302 receives the radio frequency signal transmitted by the communication transmitting antenna 301, and sends it to the self-interference canceling unit 200;
4、自干扰消除单元200将通过通信接收天线302接收的射频信号作为自干扰信号，利用从自干扰信号重构单元100接收的同频干扰信号样本生成与自干扰信号等幅、反相的抵消信号，实现对自干扰信号的干扰消除，并将干扰消除后的有用信号发送至接收机。4. The self-interference elimination unit 200 uses the radio frequency signal received by the communication receiving antenna 302 as a self-interference signal, and uses the same-frequency interference signal sample received from the self-interference signal reconstruction unit 100 to generate an equal-amplitude and anti-phase cancellation of the self-interference signal signal, realizes the interference cancellation of the self-interference signal, and sends the useful signal after the interference cancellation to the receiver.
本发明提供一种独立收发天线系统，包括接收机、发射机、通信发射天线301、通信接收天线302和上述同频自干扰消除装置。The present invention provides an independent transceiver antenna system, including a receiver, a transmitter, a communication transmitting antenna 301, a communication receiving antenna 302, and the same-frequency self-interference elimination device.
本发明提供一种适用独立收发天线架构的同频自干扰消除装置，针对独立收发天线架构，设计了一个单独的自干扰信号重构单元，该单元由一套自干扰重构天线以及微波暗箱构成。自干扰重构天线有两个，为了便于区分，将这两个天线分别命名为：自干扰重构发射天线、自干扰重构接收天线。将外部用于通信的收发天线命名为：通信发射天线、通信接收天线。自干扰重构收发天线的参数与通信收发天线性能参数完全一致。自干扰重构天线安装在微波暗箱中，不接收外部空间电磁波，微波暗箱内也不存在反射，自干扰重构发射天线发射的信号经过微波暗箱内空间传输耦合到自干扰重构接收天线。发射机输出的射频信号经功分器分为两路，一路送到通信发射天线用于对外发射，一路送到自干扰信号重构单元的自干扰重构发射天线。由于自干扰重构天线与外部通信的收发天线性能参数一致，因此会产生与外部通信发射天线输出的含相同无源互调成分的样本信号。该样本信号经过自干扰抵消单元后，生成与通信接收天线耦合到的自干扰信号等幅、反相的抵消信号，合路相加后实现自干扰信号的反相抵消。The present invention provides a same-frequency self-interference elimination device applicable to an independent transceiver antenna architecture. A separate self-interference signal reconstruction unit is designed for the independent transceiver antenna architecture. The unit is composed of a set of self-interference reconstruction antennas and a microwave black box . There are two self-interference reconstruction antennas. For the convenience of distinction, these two antennas are named: self-interference reconstruction transmitting antenna and self-interference reconstruction receiving antenna. The external transceiver antennas used for communication are named: communication transmitting antenna, communication receiving antenna. The parameters of the self-interference reconstructed transceiver antenna are completely consistent with the performance parameters of the communication transceiver antenna. The self-interference reconstruction antenna is installed in the microwave dark box, does not receive external space electromagnetic waves, and there is no reflection in the microwave dark box. The signal emitted by the self-interference reconstruction transmitting antenna is coupled to the self-interference reconstruction receiving antenna through space transmission in the microwave dark box. The RF signal output by the transmitter is divided into two paths by the power divider, one is sent to the communication transmitting antenna for external transmission, and the other is sent to the self-interference reconstruction transmitting antenna of the self-interference signal reconstruction unit. Since the performance parameters of the self-interference reconstruction antenna are consistent with those of the transmitting and receiving antenna of the external communication, it will generate a sample signal containing the same passive intermodulation component as that output by the transmitting antenna of the external communication. After the sample signal passes through the self-interference canceling unit, a canceling signal with the same amplitude and opposite phase as the self-interfering signal coupled to the communication receiving antenna is generated, and the anti-phase canceling of the self-interfering signal is realized after combining and adding.
实施例1Example 1
在ADS射频仿真环境下搭建仿真模型，发射机的发射信号X(t)频点为1.5G，采用16QAM调制方式，通过仿真，本发明的一种适用于独立收发天线架构的同频自干扰消除装置接入前后，同频干扰信号的频谱如图2所示，本发明的一种适用于独立收发天线架构的同频自干扰消除装置未接入时，接收机接收到的同频干扰信号的功率约为7.2dBm，本发明的一种适用于独立收发天线架构的同频自干扰消除装置接入后，接收机接收到的同频干扰信号功率降到-71.879dBm，实现约79dB的同频自干扰消除能力。The simulation model is set up under the ADS radio frequency simulation environment, the frequency point of the transmission signal X(t) of the transmitter is 1.5G, and the 16QAM modulation mode is adopted. Through simulation, a kind of same-frequency self-interference cancellation applicable to the independent transceiver antenna structure of the present invention Before and after the device is connected, the frequency spectrum of the same-frequency interference signal is shown in Figure 2. When the same-frequency self-interference cancellation device suitable for the independent transceiver antenna architecture of the present invention is not connected, the frequency spectrum of the same-frequency interference signal received by the receiver is The power is about 7.2dBm. After the same-frequency self-interference elimination device suitable for independent transceiver antenna architecture is connected, the power of the same-frequency interference signal received by the receiver is reduced to -71.879dBm, and the same-frequency interference of about 79dB is realized. Self-interference cancellation capability.
以上所述，仅为本发明最佳的具体实施方式，但本发明的保护范围并不局限于此，任何熟悉本技术领域的技术人员在本发明揭露的技术范围内，可轻易想到的变化或替换，都应涵盖在本发明的保护范围之内。The above description is only the best specific implementation mode of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art can easily conceive of changes or modifications within the technical scope disclosed in the present invention. Replacement should be covered within the protection scope of the present invention.
本发明说明书中未作详细描述的内容属于本领域专业技术人员的公知技术。The content that is not described in detail in the specification of the present invention belongs to the well-known technology of those skilled in the art.
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