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arXiv cs/0409027cs.ITmath.IT
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图上删余码译码复杂度的界

Bounds on the decoding complexity of punctured codes on graphs

H. Pfister, I. Sason, R. Urbanke

摘要:

我们提出了两个序列的合奏的非系统的不规则重复累积码渐近(因为它们的块长度趋于无穷大)实现容量的二进制擦除信道(BEC)的有限的复杂性,每个信息位。这是在对比所有以前的建设能力,实现序列的合奏,其复杂性增长至少像对数的倒数差距(率)的能力。新的有界复杂度的结果是通过打孔比特,并以这种方式允许足够数量的状态节点在坦纳图表示的代码。我们还推导出一个信息理论上的图上的随机打孔码的解码复杂度的下界。该界对每个无记忆二进制输入输出对称信道都成立,并对BEC进行了改进。

英文摘要:

We present two sequences of ensembles of non-systematic irregular repeat-accumulate codes which asymptotically (as their block length tends to infinity) achieve capacity on the binary erasure channel (BEC) with bounded complexity per information bit. This is in contrast to all previous constructions of capacity-achieving sequences of ensembles whose complexity grows at least like the log of the inverse of the gap (in rate) to capacity. The new bounded complexity result is achieved by puncturing bits, and allowing in this way a sufficient number of state nodes in the Tanner graph representing the codes. We also derive an information-theoretic lower bound on the decoding complexity of randomly punctured codes on graphs. The bound holds for every memoryless binary-input output-symmetric channel, and is refined for the BEC.

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