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arXiv 1407.5136cs.ITmath.IT
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基于删截和扩展技术的速率兼容短分组码LDPC码

Rate-Compatible LDPC Codes Based on Puncturing and Extension Techniques for Short Block Lengths

J. Liu, R. C. de Lamare

摘要:

在本文中,我们研究了新的策略,生成速率兼容(RC)的非规则低密度奇偶校验(LDPC)码与短/中等块长度。我们提出了三个打孔和两个扩展方案,旨在确定打孔的位置,最大限度地降低性能和扩展,最大限度地提高性能。第一打孔方案采用计数循环算法和用于在Tanner图(TG)中具有相等长度的短循环的变量节点的分组策略。第二个方案依赖于一个度量称为外部消息度(EMD)和第三个方案是一个基于模拟的穷举搜索,以找到最好的打孔模式中的几个随机的。此外,我们设计了两种基于计数循环算法和EMD度量的分层结构扩展方案,并将其应用于RC-LDPC码的设计。仿真结果表明,在加性高斯白噪声(AWGN)信道下,提出的扩展和打孔技术具有更大的速率灵活性和良好的性能,优于现有技术。

英文摘要:

In this paper, we investigate novel strategies for generating rate-compatible (RC) irregular low-density parity-check (LDPC) codes with short/moderate block lengths. We propose three puncturing and two extension schemes, which are designed to determine the puncturing positions that minimize the performance degradation and the extension that maximize the performance. The first puncturing scheme employs a counting cycle algorithm and a grouping strategy for variable nodes having short cycles of equal length in the Tanner Graph (TG). The second scheme relies on a metric called Extrinsic Message Degree (EMD) and the third scheme is a simulation-based exhaustive search to find the best puncturing pattern among several random ones. In addition, we devise two layer-structured extension schemes based on a counting cycle algorithm and an EMD metric which are applied to design RC-LDPC codes. Simulation results show that the proposed extension and puncturing techniques achieve greater rate flexibility and good performance over the additive white Gaussian noise (AWGN) channel, outperforming existing techniques.

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