Two Decades of MIMO Design Tradeoffs and Reduced-Complexity MIMO Detection in Near-Capacity Systems
Two Decades of MIMO Design Tradeoffs and Reduced-Complexity MIMO Detection in Near-Capacity Systems
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DOI：
10.1109/access.2017.2707182
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发表时间：
2017-01-01
期刊：
影响因子：
3.9
通讯作者：
Hanzo, Lajos
中科院分区：
文献类型：
--
作者：
Xu, Chao;Sugiura, Shinya;Hanzo, Lajos
多输入多输出（MIMO）系统的发展是由一对突出的权衡决定的。更明确地说，MIMO发展的早期主要是由贝尔实验室分层空时和空时块编码之间的复用分集权衡所激发的。后来，引入了线性色散码的概念，以实现灵活的折衷。最近的MIMO系统设计受到性能-复杂度权衡的激励，其中空间调制和空时移键控概念消除了天线间干扰的问题，并且在低复杂度线性接收机的帮助下表现良好，而不会对通用最大似然/最大后验辅助MIMO检测造成实质性性能损失。在未编码和编码MIMO系统中MIMO设计权衡的背景下，在这篇论文中，我们对MIMO检测器进行了全面的调查，范围从硬判决到软判决。软判决MIMO检测器在接近MIMO容量定理所承诺的全部性能潜力方面起着关键作用。在接近容量的系统设计中，软判决MIMO检测占主导地位的总复杂度，因为所有的MIMO信号组合必须被检查，当信道的输出信号和从信道解码器收集的先验对数似然比被考虑。在此背景下，我们提供了降低复杂度的设计准则，这是设想了广泛的软决策MIMO检测器。
A pair of salient tradeoffs have driven the multiple-input multiple-output (MIMO) systems developments. More explicitly, the early era of MIMO developments was predominantly motivated by the multiplexing-diversity tradeoff between the Bell Laboratories layered space-time and space-time block coding. Later, the linear dispersion code concept was introduced to strike a flexible tradeoff. The more recent MIMO system designs were motivated by the performance-complexity tradeoff, where the spatial modulation and space-time shift keying concepts eliminate the problem of inter-antenna interference and perform well with the aid of low-complexity linear receivers without imposing a substantial performance loss on generic maximum-likelihood/max a posteriori-aided MIMO detection. Against the background of the MIMO design tradeoffs in both uncoded and coded MIMO systems, in this treatise, we offer a comprehensive survey of MIMO detectors ranging from hard decision to soft decision. The soft-decision MIMO detectors play a pivotal role in approaching to the full-performance potential promised by the MIMO capacity theorem. In the near-capacity system design, the soft-decision MIMO detection dominates the total complexity, because all the MIMO signal combinations have to be examined, when both the channel's output signal and the a priori log-likelihood ratios gleaned from the channel decoder are taken into account. Against this background, we provide reduced-complexity design guidelines, which are conceived for a wide-range of soft-decision MIMO detectors.