Novel multi-tap analog self-interference cancellation architecture with shared phase-shifter for full-duplex communications  

作　　者：Hongtao LU Chuan HUANG Shihai SHAO Youxi TANG 

机构地区：[1]National Key Laboratory of Science and Technology on Communications, University of Electronic Science and Technology of China, Chengdu 611731, China

出　　处：《Science China(Information Sciences)》2017年第10期135-150,共16页中国科学（信息科学）（英文版）

基　　金：supported by National Natural Science Foundation of China(Grant Nos.61531009,61501093,61271164,61471108);Fundamental Research Funds for the Central Universities

摘　　要：Multi-tap analog self-interference （SI） cancellation structures adopt parallel taps to reconstruct and then cancel SI in full-duplex radios. Each tap is usually comprised of one fixed delay line, one variable attenuator, and one optional variable phase shifter. To balance the quantity of the variable phase shifters and the achievable SI cancellation （SIC） performance, this paper proposes a novel analog SIC cancellation structure, called shared-phase-shifter constrained multi-tap structure （SMTS）. In the proposed architecture, all taps share one phase shifter to emulate the dominated phase offset of the SI channel, which reduces the complexity of the implementation of the multi-tap analog SIC structure and avoids the SIC performance degradation. Then, the proposed SMTS and the existing structures are compared in terms of SIC performance and power dissipation. Finally, extensive simulations show that SMTS provides the close-to-optimal SIC performance as well as the lowest power dissipation relative to the existing multi-tap structures.Multi-tap analog self-interference （SI） cancellation structures adopt parallel taps to reconstruct and then cancel SI in full-duplex radios. Each tap is usually comprised of one fixed delay line, one variable attenuator, and one optional variable phase shifter. To balance the quantity of the variable phase shifters and the achievable SI cancellation （SIC） performance, this paper proposes a novel analog SIC cancellation structure, called shared-phase-shifter constrained multi-tap structure （SMTS）. In the proposed architecture, all taps share one phase shifter to emulate the dominated phase offset of the SI channel, which reduces the complexity of the implementation of the multi-tap analog SIC structure and avoids the SIC performance degradation. Then, the proposed SMTS and the existing structures are compared in terms of SIC performance and power dissipation. Finally, extensive simulations show that SMTS provides the close-to-optimal SIC performance as well as the lowest power dissipation relative to the existing multi-tap structures.

关 键 词：full-duplex multi-tap structure power dissipation phase shifter self-interference cancellation 

分 类 号：TN623[电子电信—电路与系统] TN92