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Performance of LDPC Codes Under Faulty Iterative Decoding

机译:错误迭代解码下的LDPC码性能

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Departing from traditional communication theory where decoding algorithms are assumed to perform without error, a system where noise perturbs both computational devices and communication channels is considered here. This paper studies limits in processing noisy signals with noisy circuits by investigating the effect of noise on standard iterative decoders for low-density parity-check (LDPC) codes. Concentration of decoding performance around its average is shown to hold when noise is introduced into message-passing and local computation. Density evolution equations for simple faulty iterative decoders are derived. In one model, computing nonlinear estimation thresholds shows that performance degrades smoothly as decoder noise increases, but arbitrarily small probability of error is not achievable. Probability of error may be driven to zero in another system model; the decoding threshold again decreases smoothly with decoder noise. As an application of the methods developed, an achievability result for reliable memory systems constructed from unreliable components is provided.
机译:与传统的通信理论不同,在传统的通信理论中,假定解码算法可以无错误地执行,这里考虑的是噪声干扰计算设备和通信通道的系统。本文通过研究噪声对低密度奇偶校验(LDPC)码的标准迭代解码器的影响,研究了使用噪声电路处理噪声信号的限制。当将噪声引入消息传递和本地计算时,表明解码性能集中在其平均值附近。推导了简单故障迭代解码器的密度演化方程。在一种模型中,计算非线性估计阈值表明,随着解码器噪声的增加,性能会平滑降低,但是无法实现任意小的错误概率。在另一个系统模型中,错误概率可能会变为零。解码阈值再次随着解码器噪声而平滑降低。作为所开发方法的应用,提供了由不可靠组件构成的可靠存储系统的可实现性结果。

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