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首页> 外文期刊>IEEE Transactions on Vehicular Technology >Analysis and Optimization of Tail-Biting Spatially Coupled Protograph LDPC Codes for BICM-ID Systems
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Analysis and Optimization of Tail-Biting Spatially Coupled Protograph LDPC Codes for BICM-ID Systems

机译：BICM-ID系统的尾位空间耦合原型LDPC码的分析和优化

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摘要

As a typical example of bandwidth-efficient techniques, bit-interleaved coded modulation with iterative decoding (BICM-ID) provides desirable spectral efficiencies in various wireless communication scenarios. In this paper, we carry out a comprehensive investigation on tail-biting (TB) spatially coupled protograph (SC-P) low-density parity-check (LDPC) codes in BICM-ID systems. Specifically, we first develop a two-step design method to formulate a novel type of constellation mappers, referred to as labeling-bit-partial-match (LBPM) constellation mappers, for SC-P-based BICM-ID systems. The LBPM constellation mappers can be seamlessly combined with high-order modulations, such as M-ary phase-shift keying (PSK) and M-ary quadrature amplitude modulation (QAM). Furthermore, we conceive a new bit-level interleaving scheme, referred to as variable node matched mapping (VNMM) scheme, which can substantially exploit the structure feature of SC-P codes and the unequal protection-degree property of labeling bits to trigger the wave-like convergence for TB-SC-P codes. In addition, we propose a hierarchical extrinsic information transfer (EXIT) algorithm to predict the convergence performance (i.e., decoding thresholds) of the proposed SC-P-based BICM-ID systems. Theoretical analyses and simulation results illustrate that the LBPM-mapped SC-P-based BICM-ID systems are remarkably superior to the state-of-the-art mapped counterparts. Moreover, the proposed SC-P-based BICM-ID systems can achieve even better error performance with the aid of the VNMM scheme. As a consequence, the proposed LBPM constellation mappers and VNMM scheme make the SC-P-based BICM-ID systems a favorable choice for the future-generation wireless communication systems.
机译：作为带宽高效技术的典型示例，具有迭代解码的比特交织编码调制（BICM-ID）在各种无线通信场景中提供了理想的频谱效率。在本文中，我们对BICM-ID系统中的咬尾（TB）空间耦合原型（SC-P）低密度奇偶校验（LDPC）代码进行了全面研究。具体来说，我们首先开发两步设计方法，以针对基于SC-P的BICM-ID系统制定一种新型的星座映射器，称为标记位局部匹配（LBPM）星座映射器。 LBPM星座图映射器可以与高阶调制（例如M元相移键控（PSK）和M元正交幅度调制（QAM））无缝组合。此外，我们构想了一种新的比特级交织方案，称为可变节点匹配映射（VNMM）方案，该方案可以充分利用SC-P码的结构特征和标记位的不相等保护度特性来触发电波。 TB-SC-P码的类似收敛。此外，我们提出了一种分层的外部信息传输（EXIT）算法，以预测所提出的基于SC-P的BICM-ID系统的收敛性能（即解码阈值）。理论分析和仿真结果表明，基于LBPM映射的基于SC-P的BICM-ID系统明显优于最新的映射对等系统。此外，借助VNMM方案，提出的基于SC-P的BICM-ID系统可以实现更好的错误性能。结果，所提出的LBPM星座映射器和VNMM方案使得基于SC-P的BICM-ID系统成为下一代无线通信系统的有利选择。

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