基于分段反变换的无线全双工多径自干扰信号抵消方法  

Multipath Self-interference Cancellation Based on Segment Inverse Transform Method for Wireless Full-Duplex Systems

作　　者：吴炜 王文鼐[1,2] 王斌[1,2] Wu Wei;Wang Wennai;Wang Bin(College of Telecommunication and Information Engineering,Nanjing University of Posts and Telecommunications,Nanjing,Jiangsu 210000,China;Key Lab of Broadband Wireless Communication and Sensor Technology,Nanjing University of Posts and Telecommunications,Ministry of Education,Nanjing,Jiangsu 210000,China)

机构地区：[1]南京邮电大学通信与信息工程学院,江苏南京210000 [2]宽带无线通信与传感技术教育部重点实验室,江苏南京210000

出　　处：《信号处理》2020年第2期188-195,共8页Journal of Signal Processing

基　　金：江苏省研究生科研与实践创新计划项目(KYCX18_0897,SJCX18_0278)。

摘　　要：针对无线带内全双工系统存在的多径自干扰信号,若采用模拟域多抽头抵消电路,需要复杂的电路结构和控制算法。本文提出一种数字域协助的多径自干扰抵消方法,根据瑞利分布模型,利用分段反变换法(SITM)直接产生数字抵消参数,再反馈到模拟域进行抵消。本方法无需在数字域建立复杂的信道模型,电路结构得到精简。仿真结果表明,在信号传播路径数为20的情况下,本文方案相比于已有方案有5 dB的性能增益,且不随路径数的增大而明显减小。For cancelling the multipath self-interference(SI) signals in wireless full-duplex communications,multi-tap cancellation circuit in the analog-domain requires large amounts of taps and complex tuning algorithm.In this paper,a digitally assisted analog cancellation scheme is proposed,which utilizes segment inverse transform method(SITM) to generate digital cancelling parameters based on Rayleigh fading model,and converts the cancellation signal to analog-domain through an auxiliary transmit chain.Comparing to other digitally assisted analog cancellation schemes,the proposed scheme is able to simplify the cancellation circuit,since it is free of building complex channel model in the digital domain.Simulation results show that when the number of propagation paths is 20,the amount of cancellation is 5 dB higher than the current scheme in literature,and it is less affected by the number of paths.

关 键 词：无线全双工 自干扰抵消 多径自干扰 分段反变换法 

分 类 号：TN92[电子电信—通信与信息系统]