Analysis of performance and capacity of coherent DS-CDMA reverse link communications

The performance and achievable capacity of a coherent reverse channel of an IS-95-like DS-CDMA system previously described by Ling (see IEEE Proc. VTC´93, p.400-403, May 19993) are evaluated. A general analysis of the receiver performance that extends the previous results and provides insight into the system performance and design considerations is given. A similar analysis is then performed for evaluation of the pilot-channel-based coherent communication described by Brismark et al. (see IEEE Proc. VTC´94, Stockholm Sweden, June 1994). A comparison between these two schemes is given. It is also shown that the system capacity of the reference symbol-based coherent reverse channel can be further improved by adopting orthogonal signaling to reduce the intracell interference. Thus, it is possible to significantly increase the reverse channel capacity of an IS-95-like DS-CDMA system at a lower implementation complexity by employing such a coherent communication scheme