Power Scaling of Full-Duplex Two-Way Massive MIMO Relay Systems With Correlated Antennas and MRC/MRT Processing
Power Scaling of Full-Duplex Two-Way Massive MIMO Relay Systems With Correlated Antennas and MRC/MRT Processing
复制标题
具有相关天线和 MRC/MRT 处理的全双工双向大规模 MIMO 中继系统的功率缩放
DOI：
10.1109/twc.2017.2702181
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发表时间：
2017-07-01
影响因子：
10.4
通讯作者：
Xia, Bin
中科院分区：
文献类型：
--
作者：
Feng, Junjuan;Ma, Shaodan;Xia, Bin
本文分析了全双工（FD）双向大规模多输入多输出（MIMO）中继系统的性能。特别研究了一种流行的线性继电器方案，即最大比组合/最大比传输继电器。与先前的分析不同，本文考虑了多对MIMO用户以及中继和用户处的天线相关性。首先导出一般情况下的渐近和率。然后讨论了四种特殊的幂标度情况，并以简单的形式给出了相应的渐近和率。分析结果清楚地量化了自环干扰、群内干扰和天线相关性的影响，并发现了各种情况下的功率标度规律。研究发现，MIMO用户和中继的传输功率与中继天线数成反比，而当中继天线数增加时仍能保持理想的和速率。最后将FD双向大规模MIMO中继系统与半双工（HD）中继系统进行了比较。结果表明，在两种特殊的功率缩放情况下，FD系统与HD系统相比可以实现两倍的和速率。然而，在其他两种功率标度情况下，自环干扰和群内干扰降低了渐近和速率，FD系统的性能可能比HD系统差。明确给出了FD系统优于HD系统的最大允许自环干扰。此外，还分析了天线相关对用户和中继的影响。结果表明，在一定的功率比例情况下，用户处的天线相关性对和速率的影响较为复杂，而中继处的天线相关性对和速率的影响不大。
In this paper, the performance of full-duplex (FD) two-way massive multiple-input multiple-output (MIMO) relay systems is analyzed. One popular linear relaying scheme, i.e., maximum ratio combining/maximum ratio transmission relaying, is particularly investigated. Different from prior analyses, multi-pair of MIMO users and antenna correlation at both the relay and the users are considered. Asymptotic sum-rate under a general case is first derived. Four special power scaling cases are then discussed and the corresponding asymptotic sum-rates are derived in simple forms with clear insights. The analytical results clearly quantify the impacts of self-loop interference, intra-group interference and antenna correlation, and discover the power scaling laws under various cases. It is found that the transmission powers at both the MIMO users and the relay can be scaled down inversely proportional to the number of antennas at the relay while maintaining a desirable sum-rate when the number of antennas at the relay grows large. The FD two-way massive MIMO relay system is finally compared with the half-duplex (HD) counterpart. It is revealed that under two special power scaling cases, the FD system can achieve double sum-rate when compared with the HD system. However, under the other two power scaling cases, self-loop interference and intra-group interference degrade the asymptotic sum-rate and the FD system may perform worse than the HD system. The maximum allowable self-loop interference for the FD system to outperform the HD system is given explicitly. In addition, the impact of antenna correlation at the users and the relay is analyzed. The results show that the antenna correlation at the users has complicate impact on the sum-rate, while the antenna correlation at the relay may not affect the sum-rate under certain power scaling cases.