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对于北斗卫星导航系统中使用的BCH(15,11)码,提出了一种基于重编码的低复杂度软判决译码算法。该算法在检测到硬判决结果包含错误时,根据软判决向量构造若干备选信息序列,并对每个信息序列进行重新编码,与接收软判决向量进行相关,选择最大相关值的码字作为译码结果。仿真结果表明,该算法相对于传统的硬判决译码算法的复杂度增加不高,但是纠错性能相有了很大提升,并且避免了纠错ROM信号的存储,因此是实际导航接收机译码算法的良好选择。
For BCH (15,11) codes used in BeiDou satellite navigation system, a low complexity soft decision decoding algorithm based on re-encoding is proposed. When detecting the inclusion of errors in the hard decision results, the algorithm constructs several candidate information sequences according to the soft decision vector, re-encodes each information sequence and correlates with receiving soft decision vectors, and selects the code with the largest correlation value as the translation Yards results. The simulation results show that the complexity of this algorithm is not high compared with the traditional hard decision decoding algorithm, but the performance of error correction is greatly improved, and the storage of error correction ROM signal is avoided. Therefore, A good choice for code algorithms.