【摘要】：同時同頻全雙工克服了時分雙工、頻分雙工技術(shù)資源利用率低的缺點,使頻譜效率提高了一倍。全雙工技術(shù)核心問題是如何抑制強自干擾信號,在射頻域進行自干擾信號抑制是其中一個重要方法。論文結(jié)合兩發(fā)兩收全雙工基站通信模式,對射頻自干擾抑制電路進行研究與驗證。首先,對射頻自干擾抑制方法進行技術(shù)分析。介紹了兩種射頻域自干擾抑制方法,著重分析了時延、幅度、相位、重建支路和信號功率等因素對射頻自干擾抑制能力的影響;結(jié)合3GPP標準,提出了全雙工基站射頻自干擾抑制電路技術(shù)指標;依據(jù)技術(shù)指標,給出了兩發(fā)兩收全雙工基站結(jié)構(gòu)。其次,制定了兩發(fā)兩收全雙工射頻自干擾抑制電路方案。給出了收發(fā)通道和重建通道的連接結(jié)構(gòu);分析直接耦合干擾重建方案,并討論了各重建支路的時延、幅度調(diào)整、相位調(diào)整等鏈路結(jié)構(gòu);確定了功率檢測和控制方案。再次,完成兩發(fā)兩收全雙工射頻自干擾抑制電路的硬件實現(xiàn)。根據(jù)制定的方案和技術(shù)指標,給出了重建通道、功率檢測的鏈路結(jié)構(gòu)和關(guān)鍵指標預(yù)算,并根據(jù)鏈路結(jié)構(gòu)和指標預(yù)算,選擇滿足性能需求的器件,完成了控制模塊和電源模塊的電路實現(xiàn)。最后,完成射頻自干擾抑制電路板的調(diào)試,測試和驗證了電路板性能。測試了電路板的幅度、相位、時延、帶內(nèi)波動等基本指標,用20MHz帶寬LTE信號驗證射頻抵消能力,測試結(jié)果表明,射頻自干擾抑制能力在33dB左右,和天線隔離一起有58dB的抑制能力。論文完成的兩發(fā)兩收射頻自干擾抑制電路,能抑制一定的強自干擾信號,為以后更大信號帶寬、多天線的同時同頻全雙工通信提供了一定的理論和硬件實現(xiàn)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.
【學(xué)位授予單位】：電子科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TN929.5

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