A Comparison of Two MIMO Relaying Protocols in Nakagami- $m$ Fading
A Comparison of Two MIMO Relaying Protocols in Nakagami- $m$ Fading
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DOI：
10.1109/tvt.2012.2185259
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发表时间：
2012-03
影响因子：
6.8
通讯作者：
M. Elkashlan;Phee Lep Yeoh;Nan Yang;T. Duong;C. Leung
中科院分区：
文献类型：
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作者：
M. Elkashlan;Phee Lep Yeoh;Nan Yang;T. Duong;C. Leung
发射天线选择与接收最大比合并（TAS/MRC）和发射天线选择与接收选择合并（TAS/SC）是两种有吸引力的多输入多输出（MIMO）协议。在本文中，我们提出了一个框架的TAS/MRC和TAS/SC在两跳放大转发中继网络的比较分析。在这样做时，我们推导出精确和渐近表达式的符号错误率（SER）在Nakagami-m衰落。使用渐近表达式，两个协议之间的SNR差距进行量化。鉴于这两个协议保持相同的多样性顺序，我们表明，SNR差距是完全依赖于阵列增益。出于这一点，我们推导出的SNR差距作为一个简单的比率的两个协议的各自的阵列增益。该比率明确考虑了天线数量和衰落严重性参数的影响。此外，我们解决的基本问题，“如何分配源和中继之间的总发射功率的方式，SER是最小化？”我们的答案是在新的紧凑表达式的功率分配因子，这是一个实用的设计工具，最佳地分配在网络中的总发射功率的形式。
Transmit antenna selection with receive maximal-ratio combining (TAS/MRC) and transmit antenna selection with receive selection combining (TAS/SC) are two attractive multiple-input-multiple-output (MIMO) protocols. In this paper, we present a framework for the comparative analysis of TAS/MRC and TAS/SC in a two-hop amplify-and-forward relay network. In doing so, we derive exact and asymptotic expressions for the symbol error rate (SER) in Nakagami-m fading. Using the asymptotic expressions, the SNR gap between the two protocols is quantified. Given that the two protocols maintain the same diversity order, we show that the SNR gap is entirely dependent on the array gain. Motivated by this, we derive the SNR gap as a simple ratio of the respective array gains of the two protocols. This ratio explicitly takes into account the impact of the number of antennas and the fading severity parameter . In addition, we address the fundamental question of “How to allocate the total transmit power between the source and the relay in such a way that the SER is minimized?” Our answer is given in the form of new compact expressions for the power allocation factor, which is a practical design tool that optimally distributes the total transmit power in the network.