Duplexer Design for Full-Duplex Based Wireless Communications  

作　　者：Hui Zhuang Jintao Li Weibiao Geng Xiaoming Dai 

机构地区：[1]Beijing Engineering and Technology Research Center for Convergence Networks and Ubiquitous Services,School of Computer and Communication Engineering,University of Science and Technology

出　　处：《China Communications》2016年第11期1-13,共13页中国通信（英文版）

基　　金：supported by the key project of the National Natural Science Foundation of China(No.61431001);the 5G research program of China Mobile Research Institute (No.[2015] 0615);Key Laboratory of Cognitive Radio and Information Processing,Ministry of Education(Guilin University of Electronic Technology);the Foundation of Beijing Engineering and Technology Center for Convergence Networks and Ubiquitous Services

摘　　要：The full-duplex(FD) based wireless communication devices,which are capable of concurrently transmitting and receiving signals with a single frequency band,suffer from a severe self-interference(SI) due to the large power difference between the devices' own transmission and the useful signal comes from the remote transmitters. To enable the practical FD devices to be implementable,the SI power must be sufficiently suppressed to the level of background noise power,making the received signal-to-interference-plus-noise ratio(SINR) satisfy the decoding requirement. In this paper,the design and implementation of the duplexer for facilitating SI cancellation in FD based wireless communications are investigated,with a new type of duplexer(i.e. an improved directional coupler) designed for improving the spatial suppression of the SI power. Furthermore,the practical circuit boards are designed and verified for the proposed prototype,showing that the spatial suppression capability may be up to 36 d B(i.e. much higher than that attainable in the commonly designed ferrite circulator) by using the proposed design.The full-duplex（FD） based wireless communication devices,which are capable of concurrently transmitting and receiving signals with a single frequency band,suffer from a severe self-interference（SI） due to the large power difference between the devices＇ own transmission and the useful signal comes from the remote transmitters. To enable the practical FD devices to be implementable,the SI power must be sufficiently suppressed to the level of background noise power,making the received signal-to-interference-plus-noise ratio（SINR） satisfy the decoding requirement. In this paper,the design and implementation of the duplexer for facilitating SI cancellation in FD based wireless communications are investigated,with a new type of duplexer（i.e. an improved directional coupler） designed for improving the spatial suppression of the SI power. Furthermore,the practical circuit boards are designed and verified for the proposed prototype,showing that the spatial suppression capability may be up to 36 d B（i.e. much higher than that attainable in the commonly designed ferrite circulator） by using the proposed design.

关 键 词：full-duplex wireless communications Self-interference cancellation DUPLEXER Directional coupler 

分 类 号：TN92[电子电信—通信与信息系统] TN948.53[电子电信—信息与通信工程]