Efficient Feasibility Examination for Successive Interference Cancellation in DS-CDMA Systems

On the uplink of a DS-CDMA system, Successive Interference Cancellation (SIC) technique can be employed to reduce multiple access interference and improve system capacity. In such a system with K active users, there are K! possible decoding orders of SIC and not every decoding order is feasible due to some constraints. It is highly time-consuming to examine the system feasibility directly by using the Exhaustive Search Method (ESM) for a system with even a moderate number of users. In this paper, the authors propose an efficient approach for examining the feasibility of DS-CDMA systems with imperfect SIC.