2发2收全双工基站射频自干扰抑制电路研究与验证

发布时间：2018-11-18 10:55

【摘要】：同时同频全双工克服了时分双工、频分双工技术资源利用率低的缺点,使频谱效率提高了一倍。全双工技术核心问题是如何抑制强自干扰信号,在射频域进行自干扰信号抑制是其中一个重要方法。论文结合两发两收全双工基站通信模式,对射频自干扰抑制电路进行研究与验证。首先,对射频自干扰抑制方法进行技术分析。介绍了两种射频域自干扰抑制方法,着重分析了时延、幅度、相位、重建支路和信号功率等因素对射频自干扰抑制能力的影响;结合3GPP标准,提出了全双工基站射频自干扰抑制电路技术指标;依据技术指标,给出了两发两收全双工基站结构。其次,制定了两发两收全双工射频自干扰抑制电路方案。给出了收发通道和重建通道的连接结构;分析直接耦合干扰重建方案,并讨论了各重建支路的时延、幅度调整、相位调整等链路结构;确定了功率检测和控制方案。再次,完成两发两收全双工射频自干扰抑制电路的硬件实现。根据制定的方案和技术指标,给出了重建通道、功率检测的链路结构和关键指标预算,并根据链路结构和指标预算,选择满足性能需求的器件,完成了控制模块和电源模块的电路实现。最后,完成射频自干扰抑制电路板的调试,测试和验证了电路板性能。测试了电路板的幅度、相位、时延、带内波动等基本指标,用20MHz带宽LTE信号验证射频抵消能力,测试结果表明,射频自干扰抑制能力在33dB左右,和天线隔离一起有58dB的抑制能力。论文完成的两发两收射频自干扰抑制电路,能抑制一定的强自干扰信号,为以后更大信号带宽、多天线的同时同频全双工通信提供了一定的理论和硬件实现支持。
[Abstract]:At the same time, the same frequency full duplex overcomes the shortcomings of time division duplex and low utilization ratio of frequency division duplex technology, and the spectrum efficiency is doubled. The key problem of full-duplex technology is how to suppress strong self-interference signals. The suppression of self-interference signals in RF domain is one of the most important methods. In this paper, the RF self-interference suppression circuit is studied and verified by combining the two-transmitter and two-receive full duplex base station communication mode. Firstly, the radio frequency self-interference suppression method is analyzed. In this paper, two kinds of RF domain self-interference suppression methods are introduced, and the effects of time delay, amplitude, phase, reconstruction branch and signal power on RF self-interference suppression ability are analyzed. Combined with 3GPP standard, the technical index of RF self-interference suppression circuit of full-duplex base station is proposed, and the structure of full-duplex base station with two transmissions and two receivers is given according to the technical index. Secondly, a full duplex RF self-interference suppression circuit with two transmitters and two receivers is developed. The connection structure of the transceiver channel and the reconstruction channel is given, the reconstruction scheme of direct coupling interference is analyzed, and the link structures such as delay, amplitude adjustment and phase adjustment of each reconstruction branch are discussed, and the power detection and control scheme is determined. Thirdly, the hardware implementation of two-transmitter and two-receive full duplex RF self-interference suppression circuit is completed. According to the established scheme and technical index, the link structure and key index budget of reconstruction channel, power detection are given, and according to the link structure and index budget, the devices that meet the performance requirements are selected. The circuit realization of control module and power module is completed. Finally, the debugging of RF self-interference suppression circuit board is completed, and the performance of circuit board is tested and verified. The amplitude, phase, time delay and in-band fluctuation of the circuit board are tested. The 20MHz bandwidth LTE signal is used to verify the radio frequency cancellation ability. The test results show that the radio frequency self-interference suppression ability is about 33dB. 58dB suppression with antenna isolation. The two transmit and two receive RF self interference suppression circuit can suppress a certain strong self interference signal, which provides a certain theoretical and hardware support for the future signal bandwidth and multiple antennas at the same time frequency full duplex communication.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN929.5

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