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本文提出了两种快速软判决译码算法:一是广义最小距寓译码(GMD)与Chase算法相结合、利用已经试探的译码错误信息、减少试探次数的广义门限Chase算法;另一是应用软判决快速捕错译码的算法,它不需要一般的硬判决译码器,因而译码速度更快。讨论了这两种算法的工作原理、运算速度、必要条件,并用计算机对部分算法进行了模拟。结果表明,这两种算法的译码速度均比Chase算法耍快,但译码错误概率几乎相同。
In this paper, two fast soft-decision decoding algorithms are proposed. One is the combination of GMD and Chase algorithm, which uses the already-probed decoding error information to reduce the number of probing generalized threshold Chase algorithm. The application of soft decision fast decoding algorithm, it does not require the usual hard-decision decoder, thus decoding faster. The working principle, computing speed and necessary conditions of these two algorithms are discussed, and some algorithms are simulated by computer. The results show that the decoding speed of these two algorithms is faster than Chase algorithm, but the decoding error probability is almost the same.