Self-mixed self-interference analog cancellation in full-duplex communications  

作　　者：Hongtao LU Shihai SHAO Kai DENG Youxi TANG 

机构地区：[1]National Key Laboratory of Science and Technology on Communications,University of Electronic Science and Technology of China [2]Department of Physical Science and Electronic Engineering, Yibin University

出　　处：《Science China(Information Sciences)》2016年第4期27-40,共14页中国科学（信息科学）（英文版）

基　　金：supported by National Natural Science Foundation of China (Grant Nos. 61271164, 61471108, 61201266);National Major Projects (Grant No. 2014ZX03003001-002);National Hightech R&D Program of China (863 Program) (Grant Nos. 2014AA01A704, 2014AA01A706)

摘　　要：Rather than using existing self-interference cancellation methods, which essentially consist of reconstruction and subtraction, this paper proposes a novel approach, based on multiplication, to cancel selfinterference in the analog domain in full-duplex communications. This approach is called self-mixed selfinterference analog cancellation（SM-SIAC）. Moreover, rather than using an individual analog cancellation circuit in existing self-interference cancellation methods, SM-SIAC can merge the analog cancellation circuit and the receiver. SM-SIAC is configured with three auto-tuning loops, consisting of one delay loop and two gain loops. SM-SIAC is further simplified with the Gaussian minimum shift keying（GMSK） self-interference signal.When these loops converge, the paper analyzes the cancellation capacity and derives a closed-form expression for the quadrature amplitude modulation self-interference signal and the GMSK self-interference signal. Simulation results illustrate the convergence of the gain loops and the cancellation capacity in the presence of engineering errors.Rather than using existing self-interference cancellation methods, which essentially consist of reconstruction and subtraction, this paper proposes a novel approach, based on multiplication, to cancel selfinterference in the analog domain in full-duplex communications. This approach is called self-mixed selfinterference analog cancellation（SM-SIAC）. Moreover, rather than using an individual analog cancellation circuit in existing self-interference cancellation methods, SM-SIAC can merge the analog cancellation circuit and the receiver. SM-SIAC is configured with three auto-tuning loops, consisting of one delay loop and two gain loops. SM-SIAC is further simplified with the Gaussian minimum shift keying（GMSK） self-interference signal.When these loops converge, the paper analyzes the cancellation capacity and derives a closed-form expression for the quadrature amplitude modulation self-interference signal and the GMSK self-interference signal. Simulation results illustrate the convergence of the gain loops and the cancellation capacity in the presence of engineering errors.

关 键 词：self-interference cancellation full-duplex self-mixed analog cancellation auto-tuning 

分 类 号：TN911.4[电子电信—通信与信息系统]