Spatial Interference Cancellation Algorithm

Future wireless communication systems characterized by tight frequency reuse, adaptive modulation and coding schemes and diversified data services will be interference limited by interfering signals of diverse rates and strengths. We propose in this paper a low complexity algorithm for spatial interference cancellation in the presence of one strong interferer. This algorithm is based on an earlier proposed low complexity max log MAP detector. It encompasses two strategies for interference cancellation which have been termed as partial interference cancellation (PIC) and absolute interference cancellation (AIC). Their corresponding selection in the receiver is dictated by the relative strength and the rate of interfering stream. In the scenario of interfering stream being relatively weak or of higher rate as compared to the desired stream, the mobile station (MS) resorts to PIC while when the interfering stream is relatively stronger or is of lower rate, the MS switches to AIC. Finally we analyze the performance of proposed algorithm by simulations.