上海交通大学学报

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2017 , Vol. 51 >Issue 6: 647 - 656

DOI: https://doi.org/10.16183/j.cnki.jsjtu.2017.06.002

兵器工业

 大规模天线全双工双向中继系统的干扰分析

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  •  上海交通大学 电子信息与电气工程学院， 上海 200240

网络出版日期: 2017-06-30

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 The Interference Analysis of the FullDuplex TwoWay Relaying with
 Large Antenna Arrays

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  •  School of Electronic Information and Electrical Engineering,
     Shanghai Jiao Tong University, Shanghai 200240, China

Online published: 2017-06-30

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摘要

  针对全双工中继的残留回路干扰（RLI）和大规模多输入多输出(Massive MIMO)的导频污染问题，研究了一个多对用户的全双工双向中继系统，其中用户均为单天线，中继对信号进行最大比合并/最大比发射波束赋形，信道估计阶段使用长度为τ的导频序列，且τ=K.理论分析得出，当中继的收发天线数均趋于无穷大时，全双工中继的RLI和导频污染同时趋于零，并且用户对之间干扰和噪声均被消除.仿真结果证实了上述理论分析，并且随着中继天线数的增大，系统的频谱效率和能量效率将逐渐提高.进一步仿真表明，当中继的收发天线数大于160时，全双工双向中继系统的频谱效率优于半双工双向中继系统，继而优于全双工单向中继系统，并且优势随着天线数的增大更为显著.因此，大规模天线的全双工双向中继相较传统的中继系统具有更好的通信效率.

关键词：  ; 大规模多输入多输出；全双工；双向中继系统；导频污染

本文引用格式

邱梦婷，赵普，俞晖 .  大规模天线全双工双向中继系统的干扰分析[J]. 上海交通大学学报, 2017 , 51(6) : 647 -656 . DOI: 10.16183/j.cnki.jsjtu.2017.06.002

Abstract

  In recent years, the fullduplex twoway relaying system with Massive multiple input multiple output (MIMO) has attracted significant interest because of its performance gain on spectral efficiency and energy efficiency, but it has the problems of residual loop interference (RLI) and pilot contamination. Therefore, this paper considers a Kpair fullduplex twoway relay system, and each user equips single antenna. The relay uses maximumratio combining/maximumratio transmission (MRC/MRT) beamforming to process the signals, and it estimates the channels by only K pilot symbols for 2K users. By theoretical analysis, it is concluded that when very large receive and transmit antenna arrays are used, the RLI due to full duplex and the pilot contamination can be simultaneously cancelled, also the interpair interference and noise vanish. Simulations verify the theoretical results, and show that the energy efficiency and spectral efficiency can increase with the antenna number. Moreover, it is shown that the fullduplex twoway relaying outperforms the halfduplex twoway relaying and the fullduplex oneway relaying in the spectral efficiency when the number of relay receiving/transmitting antenna is up to 160. Therefore, the fullduplex twoway relaying with large antenna arrays has higher communication efficiency than traditional relaying systems.

Key words：  ; massive multiple input multiple output (MIMO); fullduplex; twoway relaying; pilot contamination

参考文献

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