Abstract

This paper is concerned with wireless relay networks that employ K full-duplex (FD) decode-and-forward relays to help a source to communicate with a destination. Each FD relay is equipped with multiple antennas, some for receiving and some for transmitting. The paper considers joint relay-antenna selection schemes that are based on the instantaneous channel conditions for two cases of antenna configurations, namely fixed antenna configuration (FAC) and adaptive antenna configuration (AAC). Under FAC, the transmit and receive antennas at each relay are fixed, whereas in the case of AAC an antenna at a relay can be configured to be either a transmit or a receive antenna.In addition to equal power allocation between the source and selected relay, a power scaling approach to counteract the effect of residual self-interference is also examined. Closed-form expressions of the outage probability and average capacity are obtained and provide important insights on the system performance. The accuracy of the obtained expressions are corroborated by simulation results. In particular, it is shown that under FAC and without power scaling, the diversity order approaches K as the self-interference (SI) level gets smaller, while it approaches zero whenever the SI level is nonzero and the SNR increases without bound. Under FAC and with power scaling, the diversity order approaches K for any SI level. For the case of AAC and without power scaling, the diversity order approaches 2K for small SI level. When power scaling is applied in AAC, the diversity order approaches 2K at any SI level.

中文翻译：

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具有中继天线选择的全双工解码转发中继

摘要

本文涉及使用K的无线中继网络全双工（FD）解码转发中继，以帮助源与目标进行通信。每个FD继电器都配备有多个天线，其中一些用于接收，一些用于发送。本文考虑了两种情况下基于瞬时信道条件的中继天线联合选择方案，即固定天线配置（FAC）和自适应天线配置（AAC）。在FAC模式下，每个中继站的发射和接收天线是固定的，而在AAC的情况下，中继站的天线可以配置为发射或接收天线。 ，还研究了一种功率缩放方法来抵消残余自干扰的影响。获得了停机概率和平均容量的闭合形式的表达式，它们提供了有关系统性能的重要见解。仿真结果证实了所获得表达式的准确性。特别是，它表明在FAC和无功率缩放的情况下，分集阶数接近随着自干扰（SI）级别的K变小，而当SI级别非零且SNR无限增大时，K趋近于零。在FAC和功率缩放下，任何SI级别的分集阶数都接近K。对于AAC且没有功率缩放的情况，对于小SI级别，分集阶数接近2K。当在AAC中应用功率缩放时，分集阶数在任何SI级别都接近2K。