多级编码64QAM电路的研制  

The Circuit Scheme Research & Development of 64 QAM Multi Level Coded Modulation

作　　者：傅海阳[1] 黄永明[1] 

机构地区：[1]南京邮电学院,南京210003

出　　处：《通信学报》1999年第S1期242-246,共5页Journal on Communications

摘　　要：给出了用于SDH微波传输的多级编码64QAM(64 QAM MLCM)电路方案。这种方案利用了TCM的基本思路,即将卷积编码与符号集分割相结合,但是避免了其冗余度高、解调译码电路不易实现等问题。此方案可以采用通用型维特比译码器实现,并在传输带宽基本不变的条件下,取得3dB的编码增益。The circuit scheme of 64 QAM Multi Level Coded Modulation used for SDH microwave transmission is studied in this paper. This scheme makes use of the basic idea of TCM,that is to have the convolutional code cooperated with symbol set partitioning. But the problem such as high er coding redundancy,complicated decoding circuit of TCM could be released with the use of gener al viterbi decoding circuit in 64 QAM MLCM,and could obtain 3dB coding gain under the condition of maintaining the transmission bandwidth almost unchanged.

关 键 词：TCM MLCM 冗余度 编码增益 

分 类 号：TN762[电子电信—电路与系统]