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首页> 外文期刊>Vehicular Technology, IEEE Transactions on >Relay Antenna Selection in MIMO Two-Way Relay Networks Over Nakagami- $m$ Fading Channels
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Relay Antenna Selection in MIMO Two-Way Relay Networks Over Nakagami- $m$ Fading Channels

机译：Nakagami- $ m $衰落信道上的MIMO两路中继网络中的中继天线选择

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摘要

In this paper, we propose two relay antenna selection (RAS) schemes in multiple-input–multiple-output (MIMO) two-way relay networks, where an $N_{rm A}$-antenna source and an $N_{rm B}$-antenna source exchange information via an $N_{rm R}$-antenna amplify-and-forward (AF) relay. The proposed RAS schemes maximize the minimum of the two overall end-to-end signal-to-noise ratio (SNR) values. In the first RAS scheme, transmit and receive beamforming (BF) is adopted at the two sources using all antennas. In the second RAS scheme, transmit and receive antenna selection (AS) is adopted at the two sources using one antenna. To conduct a performance comparison of the proposed RAS-BF and RAS-AS schemes, we first derive new expressions for the exact outage probability over independent but not necessarily identically distributed Nakagami- $m$ fading channels. We then derive new closed-form lower and upper bounds on the outage probability to offer an efficient computation. We further derive new compact expressions for the asymptotic outage probability to characterize the performance in the high-SNR regime. Notably, we demonstrate that RAS-BF and RAS-AS achieve the full outage diversity order of $min{N_{rm A}N_{rm R}m_{rm A}, N_{rm B}N_{rm R}m_{rm B}}$, where $m_{rm A}$ and $m_{rm B}$ denote the Nakagami- $m$ fading parameters between the $N_{rm A}$-antenna source and relay and between the $N_{rm B}$-antenna source and relay, respectively. Based on asymptotic results, we determine a concise solution for the optimal power allocation among the sources and the relay to maximize the performance under the assumption that both the sources have the same transmit power. To quantify the effect of spatial correlation at the sources, we derive new closed-form expressions for the asymptotic outage probability over correlated Nakagami- $m$ fading channels. The results indicate that the spatial correlation has no impact on the outage diversity order but significantly deteriorates the outage array gain.
机译：在本文中，我们提出了在多输入多输出（MIMO）双向中继网络中的两种中继天线选择（RAS）方案，其中$ N_ {rm A} $天线源和$ N_ {rm B }天线源通过$ N_ {rm R} $天线放大转发（AF）中继交换信息。提出的RAS方案使两个端到端总信噪比（SNR）值中的最小值最小。在第一种RAS方案中，使用所有天线在两个源处采用发射和接收波束成形（BF）。在第二种RAS方案中，使用一个天线在两个源处采用发射和接收天线选择（AS）。为了对建议的RAS-BF和RAS-AS方案进行性能比较，我们首先针对独立但不一定相同分布的Nakagami-m $衰落信道推导精确中断概率的新表达式。然后，我们得出中断概率的新闭合形式下限和上限，以提供有效的计算。我们进一步推导出渐进中断概率的新紧致表达式，以表征高信噪比系统中的性能。值得注意的是，我们证明RAS-BF和RAS-AS实现了$ min {N_ {rm A} N_ {rm R} m_ {rm A}，N_ {rm B} N_ {rm R} m_ { rm B}} $，其中$ m_ {rm A} $和$ m_ {rm B} $表示$ N_ {rm A} $天线源和中继之间以及$ N_之间的Nakagami- $ m $衰落参数{rm B} $天线源和中继。基于渐近结果，在两个源均具有相同发射功率的假设下，我们确定了一种简洁的解决方案，用于在源与中继之间进行最佳功率分配，以最大化性能。为了量化空间相关性在源头的影响，我们推导了相关Nakagami- $ m $衰落信道上渐近中断概率的新闭式表达式。结果表明，空间相关性对中断分集阶数没有影响，但是会大大降低中断阵列的增益。

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