FPGA implementation of MPIC detectors for DS-CDMA systems in frequency nonselective channels

Multiuser detection (MUD) techniques are mandatory in direct-sequence code division multiple access (DS-CDMA) systems. They allow to mitigate multiple access interference (MAI) and hence increase the capacity and allow high data rates. Multistage parallel interference cancellation (MPIC) detectors are considered serious candidates for practical implementation showing a good tradeoff between performance and complexity. In this paper, FPGA implementation of MPIC detectors with and without decision feedback (DF) is presented. Although the two techniques present the same arithmetic complexity, data dependency of the DF-MPIC causes a non negligible increase in FPGA resources.