The Effect of Metric Modification on the Performance of TCM and Concatenated Systems Over Rayleigh Fading Channels

摘要

The performance improvement of conventional TCM schemes over frequency nonselective slow Rayleigh fading channels, caused by a slight modification on the calculation of the Viterbi Decoder, is investigated in this paper. A statistical analysis of the Euclidean distances at the input Of the Viterbi deconder is carried out to explain this improvement. Furthermore, the performance Improvement of two concatenated coding systems incorporating the above modification, under the Same conditions, is studied.