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arXiv 1402.7170cs.ITmath.IT
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连接多个码链提高空间耦合LDPC码的码长性能

Improving the Finite-Length Performance of Spatially Coupled LDPC Codes by Connecting Multiple Code Chains

Pablo M. Olmos, David G. M. Mitchell, Dmitri Truhachev, Daniel J. Costello

摘要:

在本文中,我们分析了有限长度的代码的性能图连接空间耦合低密度奇偶校验(SC-LDPC)码链。连续(剥离)解码被认为是二进制擦除信道(BEC)。作为一个动力系统的演化分析的二分图的未解码部分,在每次迭代后剩余的。当连接短SC-LDPC链,我们表明,除了优越的迭代解码阈值,连接链合奏有更好的有限长度的性能比单链合奏相同的速率和长度。此外,我们提出了一种新的编码/传输方案,以提高使用长SC-LDPC链的系统的性能,其中,而不是独立地发送对应于单个SC-LDPC链的码字,我们以多层格式连接连续的链以形成连接的链系综。我们将这种传输方案称为SC-LDPC码的连续链(CC)传输。我们表明,CC传输可以实现没有显着增加的编码/解码复杂度或解码延迟相对于使用一个单一的SC-LDPC码链编码的系统。

英文摘要:

In this paper, we analyze the finite-length performance of codes on graphs constructed by connecting spatially coupled low-density parity-check (SC-LDPC) code chains. Successive (peeling) decoding is considered for the binary erasure channel (BEC). The evolution of the undecoded portion of the bipartite graph remaining after each iteration is analyzed as a dynamical system. When connecting short SC-LDPC chains, we show that, in addition to superior iterative decoding thresholds, connected chain ensembles have better finite-length performance than single chain ensembles of the same rate and length. In addition, we present a novel encoding/transmission scheme to improve the performance of a system using long SC-LDPC chains, where, instead of transmitting codewords corresponding to a single SC-LDPC chain independently, we connect consecutive chains in a multi-layer format to form a connected chain ensemble. We refer to such a transmission scheme to as continuous chain (CC) transmission of SC-LDPC codes. We show that CC transmission can be implemented with no significant increase in encoding/decoding complexity or decoding delay with respect a system using a single SC-LDPC code chain for encoding.

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