Interference Cancellation Techniques for CDMA2000 1x Reverse Link

Interference cancellation (IC) techniques yielding significant capacity gains are presented in this paper for CDMA2000 1x base station receiver. In addition to performance gain from conventional IC, hybrid ARQ gain is achieved effectively without interlaced transmission or feedback on the forward link (FL). A new definition of CDMA capacity, based on equivalent load, is introduced to allow a fair comparison of capacity with and without IC. Results from detailed simulations show that capacity gain for a typical commercial network will be between twofold and threefold, depending on spatial load distribution in the network. This capacity gain is achieved without any increase in voice latency or degradation to voice quality. It also does not require changes to the air interface or any handset replacement. The techniques proposed in this paper are applicable to base station receivers of other CDMA systems such as UMTS.