首页> 外文会议>IEEE International Symposium on Information Theory >A Class of (γρ{sup}(γ-1), ρ{sup}γ, ρ, γ, {0,1}) Combinatorially Designed LDPC Codes with Application to ISI Channels
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A Class of (γρ{sup}(γ-1), ρ{sup}γ, ρ, γ, {0,1}) Combinatorially Designed LDPC Codes with Application to ISI Channels

机译:一类(gr {sup}(c-1),p,c,{0,1}组合到ISI通道的应用程序组合设计的LDPC代码

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We investigate a systematic construction of regular low density parity check (LDPC) codes based on (γρ{sup}(γ-1), ρ{sup}γ, ρ, γ, {0,1}) combinatorial designs. The proposed LDPC ensemble is (γ,ρ)-regular, linear-time encodable, and has rate (1-1/ρ){sup}γand girth ≥ 2{sup}(γ+1) (≥ 8). Prom one particular view point, the proposed codes are "loosened" finite geometry codes [2] where some lines are systematic removed. The loosened design rules offer at least two advantages: a lower decoding complexity and a richer code set. The proposed codes are a subset of Gallager's (γ,ρ)-regular random ensemble, whose m×n parity check matrix H can be horizontally split intoγsub-matrices of dimensionality (m/γ)×n each, where each sub-matrix has uniform column weight 1 and row weightρ. We show that the proposed codes contain a good combination of structure and (pseudo-)randomness, where the former enables low-cost implementation in hardware and the latter ensures reasonable performance by avoiding certain recurrent error patterns (eg. rectangular error patterns).
机译:我们研究了基于(γρ{sup}(γ-1),ρ{sup}γ,ρ,γ,{0,1})组合设计的常规低密度奇偶校验(LDPC)代码的系统构建。所提出的LDPC集合是(γ,ρ) - 正式,线性时间可供选择,并且具有速率(1-1 /ρ){sup}γanc≥2{sup}(γ+ 1)(≥8)。 PROM一个特定的视点,所提出的代码是“松开”的有限几何代码[2],其中一些线条被拆除。松开的设计规则提供至少两个优点:较低的解码复杂性和更丰富的码集。所提出的代码是痛苦(γ,ρ)的副本 - 一组随机集合,其M×n奇偶校验矩阵H可以水平分裂为每维(M /γ)×n的γsub矩阵,其中每个子矩阵具有均匀的柱重1和行重量ρ。我们表明所提出的代码包含结构和(伪)随机性的良好组合,其中前者通过硬件实现低成本实现,后者通过避免某些经常性错误模式(例如,矩形误差模式)确保合理的性能。

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