Performance analysis of a convolutional coded DS/CDMA system in Nakagami fading channels

In this paper, we investigate the performance of convolutional coded DS/CDM A with noncoherent M-ary orthogonal modulation operating in a multi-user en vironment over a slow and frequency nonselective Nakagami-m fading channel with additive white Gaussian noise (AWGN). An expression for the pairwise e rror probability that can be used to compute the upper bound of coded syste m is first derived. Performance of the DS/CDMA system with and without the convolutional codes is then presented. We have observed that convolutional codes can compensate for the degradation quite well in multi-user situation s over Nakagami fading channels with AWGN. For the case of an extreme fadin g, however, it has been seen that the convolutional code reaches its limit to improve the overall system performance as the number of users increase.