在加性白高斯信道下，比較了補(bǔ)碼鍵控最優(yōu)譯碼和大數(shù)邏輯軟判決譯碼的性能，分析了補(bǔ)碼鍵控在衰落信道的性能，并提出了補(bǔ)碼鍵控外層級(jí)聯(lián)低密度極性校驗(yàn)碼的結(jié)構(gòu)，提供了補(bǔ)碼鍵控的軟判決輸出算法，仿真結(jié)果證明補(bǔ)碼鍵控外層級(jí)聯(lián)低密度極性校驗(yàn)碼在衰落信道下有明顯的性能增益。
關(guān) 鍵 詞 補(bǔ)碼鍵控; 低密度極性校驗(yàn)碼; 外碼級(jí)聯(lián); 大數(shù)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