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A Literature Survey on Algorithms and Hardware Architectures of Max-Log-MAP Demapping
Journal of Circuits, Systems and Computers ( IF 1.5 ) Pub Date : 2021-09-10 , DOI: 10.1142/s021812662230001x
Mostafa Rizk 1, 2, 3 , Amer Baghdadi 1 , Michel Jézéquel 1
Affiliation  

Emergent wireless communication standards, which are employed in different transmission environments, support various modulation schemes. High-order constellations are targeted to achieve high bandwidth efficiency. However, the complexity of the symbol-by-symbol Maximum A Posteriori (MAP) algorithm increases dramatically for these high-order modulation schemes. In order to reduce the hardware complexity, the suboptimal Max-Log-MAP, which is the direct transformation of the MAP algorithm into logarithmic domain, is alternatively implemented. In the literature, a great deal of research effort has been invested into Max-Log-MAP demapping. Several simplifications are presented to meet with specific constellations. In addition, the hardware implementations dedicated for Max-Log-MAP demapping vary greatly in terms of design choices, supported flexibility and performance criteria, making them a challenge to compare. This paper explores the published Max-Log-MAP algorithm simplifications and existing hardware demapper designs and presents an extensive review of the current literature. In-depth comparisons are drawn amongst the designs and different key performance characteristics are described, namely, achieved throughput, hardware resource requirements and flexibility. This survey should facilitate fair comparisons of future designs, as well as opportunities for improving the design of Max-Log-MAP demappers.

中文翻译:

Max-Log-MAP解映射的算法和硬件架构文献综述

用于不同传输环境的新兴无线通信标准支持各种调制方案。高阶星座旨在实现高带宽效率。但是,逐个符号最大的复杂度后验(MAP) 算法对于这些高阶调制方案显着增加。为了降低硬件复杂度,替代实现了次优Max-Log-MAP,即MAP算法直接变换到对数域。在文献中,大量的研究工作已经投入到 Max-Log-MAP 解映射中。提出了一些简化来满足特定的星座。此外,专用于 Max-Log-MAP 解映射的硬件实现在设计选择、支持的灵活性和性能标准方面差异很大,这使得它们难以进行比较。本文探讨了已发布的 Max-Log-MAP 算法简化和现有的硬件解映射器设计,并对当前文献进行了广泛的回顾。对设计进行了深入比较,并描述了不同的关键性能特征,即实现的吞吐量、硬件资源要求和灵活性。该调查应有助于对未来设计进行公平比较,以及改进 Max-Log-MAP 解映射器设计的机会。
更新日期:2021-09-10
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