Multilevel coding with the 8-PSK signal set

摘要

Simulation results for concatenated outer Reed-Solomon and inner convolutional codes used in multilevel schemes are presented. Different high-rate inner convolutional codes are considered, viz., punctured codes and partial unit memory (PUM) codes. The best results are obtained for PUM codes, since they have a better extended row distance profile. The effect of channel and block interleaving at the different levels is also studied, and iterative decoding is tried. The system transmits signals over the AWGN channel.