On the Performance of Active Analog Self-Interference Cancellation Techniques for Beyond 5G Systems  

作　　者：Haifeng Luo Mark Holm Tharmalingam Ratnarajah 

机构地区：[1]Institute for Digital Communications,School of Engineering,The University of Edinburgh,Edinburgh,UK [2]Huawei Technologies(Sweden)AB,Gothenburg,Sweden

出　　处：《China Communications》2021年第10期158-168,共11页中国通信（英文版）

基　　金：supported by the research grant from Huawei Technologies(Sweden)AB;supported by the U.K.Engineering and Physical Sciences Research Council(EPSRC)under Grant EP/P009549/1。

摘　　要：The in-band full-duplex(IBFD)mechanism is of interest in beyond 5 G systems due to its potential to enhance spectral efficiency and reduce delay.To achieve the maximum gain of IBFD systems,the significant self-interference(SI)must be efficiently suppressed.The challenges of wideband selfinterference cancellation(SIC)lie in the radio frequency(RF)domain,where the performance will be limited by the hardware.This paper reviews current RF cancellation mechanisms and investigates an efficient mechanism for future wideband systems with minimum complexity.The working principle and implementation details of multi-tap cancellers are first introduced,then an optical domain-based RF canceller is reviewed,and a novel low-cost design is proposed.To minimize the cost and complexity of the canceller,the minimum required number of taps are analyzed.Simulation results show that with the commonly used 12-bits analog-to-digital converter(ADC)at the receiver,the novel optical domain-based canceller can enable efficient SIC in the 3 GPP LTE specifications compatible system within 400 MHz bandwidth.

关 键 词：full-duplex beyond 5G system self-interference cancellation optical domain-based canceller 

分 类 号：TN975[电子电信—信号与信息处理]