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《Journal of Xi'an Jiaotong University》 2018-09
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Wide Bandwidth Self-Interference Radio Frequency Cancelling Technique for Single-Channel Full Duplex

XU Jiangtao;TANG Bingjun;ZHAI Yujian;WU Minshun;School of Electronic and Information Engineering,Xi'an Jiaotong University;  
The realization of single-channel full duplex helps ease the contradiction between the ever-growing requirement for data rate and the extremely scarce spectrum resource.However,the biggest barrier is the strong self-interference when the transmitting signal reflected by different paths is coupled into the weak receiving signal through the antenna. Moreover,traditional filtering techniques cannot filter the interference signal because the interference signal and the received signal reside in the same frequency band.In this paper,a single antenna mode is adopted and an integratable self-interference radio frequency cancelling technique is proposed based on the principle of orthogonal vector synthesis.The cancelling signal that has the same magnitude and phase as the self-interference signal is produced by adaptively controlling the magnitudes of the quadrature reference signals obtained from the transmitter.Finally,the synthesized cancelling signal and the self-interfering signal are subtracted at the radio frequency front end of the receiver to achieve the cancellation effect.This scheme excludes the use of bandlimited components,such as phase shifter,so the cancelling bandwidth limitation is completelybroken.In addition,it has the advantages of simple architecture and easy single-chip integration.Since this technique uses the adaptive control algorithm,it is more adaptable to different working circumstances.System simulation shows that self-interference rejection up to 41 dB or more could be achieved over a wide bandwidth of 60 MHz.
【Fund】: 国家自然科学基金资助项目(61404102 61306048 61774126);; 中央高校基本科研业务费专项资金资助项目
【CateGory Index】: TN97
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