二相信号相干解调时,存在的极性不定性,给纠错码的应用提出了新问题。本文分析了采用相对二相制时,纠错码的实际纠错能力;并以循环汉明码和两种BCH码为例,指出性能下降的程度。提出了解决解调极性反转而保持纠错能力的三种方法。其代价都是減少一个信息码元。简略讨论了实现这些方法的具体问题。 When the two-phase signal coherent demodulation, the existence of the polarity of uncertainty, the application of the error-correcting code proposed a new problem. This paper analyzes the actual error correction ability of the error correction code when using relative two-phase system, and points out the extent of the performance degradation by taking the cyclic Hamming code and the two BCH codes as an example. Three methods are proposed to solve the problem of polarity reversal while maintaining error correction. The price is reduced by one information symbol. A brief discussion of the specific problems of implementing these methods.