Interference cancellation in multi stage multi-user detection in DS-CDMA System using Hybrid technique

摘要

Direct Sequence Code Division Multiple Access (DS-CDMA) system is suffers from Multiple Access Interference (MAI). Multi-User Detection schemes were introduced to detect the users' data in presence of MAI. In this paper, we proposed a novel method is called Hybrid Interference cancellation (HIC) scheme. It consists of the combination of subtracting and partial parallel interference cancellation schemes. Here considering decorrelator for first stage instead of matched filter. Partial PIC is based on multiplying the amplitude estimates with a partial cancellation factor. Subtracting PIC exploits the multi stage character of PIC to avoid unnecessary double calculations of certain terms in consecutive stages. The hybrid PIC scheme to achieve performance improvement and complexity reduction compared to conventional PIC in multistage multiuser environment.