在加性白高斯信道下，比較了補碼鍵控最優譯碼和大數邏輯軟判決譯碼的性能，分析了補碼鍵控在衰落信道的性能，并提出了補碼鍵控外層級聯低密度極性校驗碼的結構，提供了補碼鍵控的軟判決輸出算法，仿真結果證明補碼鍵控外層級聯低密度極性校驗碼在衰落信道下有明顯的性能增益。
關 鍵 詞 補碼鍵控; 低密度極性校驗碼; 外碼級聯; 大數邏輯譯碼; 最大似然譯碼

Abstract In this thesis, the performance of complementary code keying is compared between optimal decoding and majority logic decoding algorithm, and analyzed in fading channels. A structure concatenating low-density parity-check code and complementary code keying and the algorithm of soft-decision output for complementary code keying are presented, the simulation result show more better performance than complementary code keying in rayleigh fading channels.
Key words complementary code keying; low-density parity-check; outer code concatenated; majority logic decoding; maximum likelihood decoding