Improved parallel interference cancellation algorithm for multicode CDMA system

Abstract

An improved parallel interference cancellation (PIC) algorithm by iterative channel estimation for multicode CDMA system is proposed in this paper. Channel parameter is firstly estimated with the aid of pilot symbols, and then is refined by using soft information from data symbol after rake receiver. Parallel interference cancellation (PIC) is adapted to multicode interference (MCI) at the second step. Simulation Results show that the error floor of the system can be reduced significantly. The effect of different parameter on the symbol error ratio (SER) performance of the multicode CDMA are also investigated in this paper, such as the quality of channel estimation PIC cancellation factor and the number of parallel interference cancellation.