Unified Analysis of Transmit Antenna Selection in MIMO Multirelay Networks
Unified Analysis of Transmit Antenna Selection in MIMO Multirelay Networks
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DOI：
10.1109/tvt.2012.2227862
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发表时间：
2013-02
影响因子：
6.8
通讯作者：
Phee Lep Yeoh;M. Elkashlan;Nan Yang;D. B. D. Costa-D.-B.-D.-Costa-34825558;T. Duong
中科院分区：
文献类型：
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作者：
Phee Lep Yeoh;M. Elkashlan;Nan Yang;D. B. D. Costa-D.-B.-D.-Costa-34825558;T. Duong
我们提出了一个统一的渐近框架，在多输入多输出（MIMO）多中继网络与Rician，Nakagami-m，Weibull和广义K衰落信道的发射天线选择。我们应用这个框架推导出新的封闭形式表达式的中断概率和放大转发（AF）中继MIMO多中继网络中有两个不同的协议：1）发送天线选择与接收机最大比组合（TAS/MRC）和2）发送天线选择与接收机选择组合（TAS/SC）。在此基础上，推导了M进制相移键控和M进制正交幅度调制的分集阶数和阵列增益。我们证实，分集阶数只取决于衰落分布和分集分支的数量，而阵列增益取决于衰落分布，调制格式，分集分支的数量，和平均每跳信噪比（SNR）。我们强调，TAS/MRC的多样性顺序是相同的TAS/SC，无论潜在的衰落分布。因此，我们明确地将TAS/MRC和TAS/SC之间的SNR差距表征为它们各自的阵列增益的比率。一个有趣的观察达到相等的每跳SNR，两个协议之间的SNR差距是独立的中继的数量。
We present a unified asymptotic framework for transmit antenna selection in multiple-input multiple-output (MIMO) multirelay networks with Rician, Nakagami-m, Weibull, and generalized-K fading channels. We apply this framework to derive new closed-form expressions for the outage probability and symbol error rate (SER) of amplify-and-forward (AF) relaying in MIMO multirelay networks with two distinct protocols: 1) transmit antenna selection with receiver maximal-ratio combining (TAS/MRC) and 2) transmit antenna selection with receiver selection combining (TAS/SC). Based on these expressions, the diversity order and the array gain with M-ary phase-shift keying and M-ary quadrature-amplitude modulation are derived. We corroborate that the diversity order only depends on the fading distribution and the number of diversity branches, whereas the array gain depends on the fading distribution, the modulation format, the number of diversity branches, and the average per-hop signal-to-noise ratios (SNRs). We highlight that the diversity order of TAS/MRC is the same as TAS/SC, regardless of the underlying fading distribution. As such, we explicitly characterize the SNR gap between TAS/MRC and TAS/SC as the ratio of their respective array gains. An interesting observation is reached that for equal per-hop SNRs, the SNR gap between the two protocols is independent of the number of relays.