Turbo-coded ARQ scheme for a CDMA packet radio system

Summary form only given. A turbo-coded ARQ scheme is analyzed and simulated for a CDMA packet radio system. The performance is evaluated in terms of packet error probability. The wireless channel is modeled as a slow Rayleigh fading channel. The simulation results are presented with the following varying parameters: (1) the number of iterations used in the decoding process, (2) interleaver length employed in the turbo encoder, and (3) standard deviation of shadowing to evaluate the effect of channel characteristics on performance. Finally, the comparative results are shown for the optimal and suboptimal approaches used in the turbo decoding process. For turbo decoding algorithms, the MAP, the Max-Log-MAP, and the SOVA algorithms are taken into account.