大规模天线全双工双向中继系统的干扰分析

发布时间：2018-05-25 00:08

本文选题：大规模多输入多输出 + 全双工　；参考：《上海交通大学学报》2017年06期

【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.
[Abstract]:Aiming at the pilot pollution of the residual loop interference (RLI) and the large scale multiple input and multiple output passive MIMOs of full duplex relay, a full duplex bidirectional relay system with multiple pairs of users is studied, in which the users are all single antennas. The relay performs maximum ratio combination / maximum ratio transmit beamforming. In the channel estimation stage, a pilot sequence of length 蟿 is used, and 蟿 K is used. The theoretical analysis shows that when the number of transmit and receive antennas tends to infinity, the RLI and pilot pollution of full duplex relay tend to zero simultaneously, and the interference and noise between users are eliminated. The simulation results confirm the theoretical analysis, and with the increase of the number of relaying antennas, the spectral efficiency and energy efficiency of the system will be improved gradually. Further simulation results show that the spectrum efficiency of the full duplex bidirectional relay system is better than that of the half duplex bidirectional relay system when the number of transmit and receive antennas is greater than 160, and then the full duplex unidirectional relay system is better than the full duplex bidirectional relay system. And the advantage is more obvious with the increase of antenna number. Therefore, the full duplex bidirectional relay system of large-scale antenna has better communication efficiency than the traditional relay system.
【作者单位】：上海交通大学电子信息与电气工程学院;
【基金】：国家科技重大专项(2013ZX03001007-004)资助
【分类号】：TN919.3

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