Performance evaluation of a coded cellular SSMA system

This paper investigates the performance and capacity of a cellular direct sequence spread spectrum multiple access (DS/SSMA) system. As modulation scheme coherent PSK and DPSK is assumed when the signal is corrupted by AWGN and inter user interference (IUI). Strong emphasis is placed on the performance and capacity improvements due to convolutional coding when hard decision decoding is employed. It is shown that the capacity of a SSMA system is very poor when an uncoded, non-cellular system is considered. When speech is transmitted in a coded cellular SSMA system it is shown that an increase of ten times is possible over existing TDMA systems.