On multirate DS/CDMA with interference cancellation for wireless multimedia applications

Second generation digital mobile telephone systems have been in public use for several years. Research is now focusing on third generation systems. These are generally referred to as personal communications networks (PCN), universal mobile telecommunication systems (UMTS) or future public land mobile telecommunication systems (FPLMTS). Different modulation schemes supporting multiple data rates in a direct sequence code division multiple access (DS/CDMA) system are studied. A successive multistage interference cancellation scheme for the considered modulations is described. Bit error probability on both AWGN and Rayleigh fading channels are presented both with single user detection and with multistage interference cancellation. It is shown that DS/CDMA is very flexible in supporting multiple data rates for wireless multimedia applications and that significantly improved performance may be obtained using interference cancellation.