High-performance SOVA decoding for turbo codes over cdma2000 mobile radio

An improved version of the soft-output Viterbi algorithm (SOVA), which has been theoretically proven to be equivalent to the max-log-maximum a posteriori (max-log-MAP) algorithm but with greatly reduced decoding complexity, is applied to turbo codes over the 3rd generation cdma2000 mobile radio link. The BER and FER performances of the improved SOVA are evaluated by computer simulation, and compared with the max-log-MAP and the conventional SOVA algorithms. The simulation results verify that the improved SOVA scheme can offer the performance comparable to the max-log-MAP scheme, while the conventional SOVA is approximately 0.4 dB inferior to the max-log-MAP at 10/sup -3/ BER.