Comparison analysis of uncoded and trellis-coded multilevel QAMradio systems

摘要

The digital radio channel is investigated for uncoded andtrellis-coded data transmission. The receiver uses a detector havingmemory. The Viterbi algorithm is optimum for the search of the mostlikely transmitted sequence. The authors apply a suboptimum procedurecalled the M-algorithm (MA). The MA uses a sortingbreadth-first strategy and pursues only the M most likely datasequences. Simulation results are presented for uncoded/coded16-quadrature amplitude modulation (QAM)/32-CROSS and 64-QAM/128-CROSSmodulation types. The bit error rate and the signature were taken as theevaluation criteria