A Multiuser Receiver for CDMA Systems With Parity Bit Selected Spreading Sequences

Date Added: Jul 2010
Format: PDF

In this paper the authors propose a multiuser receiver using multistage detection and interference cancellation for Direct-Sequence Code-Division Multiple-Access (DS/CDMA) systems with parity bit selected spreading sequences in synchronous channels. In a CDMA system with Parity Bit selected spreading sequences (CDMA/PB), the spreading code used by each user depends on the transmitted data bits and it is selected from a set of mutually orthogonal spreading waveforms allocated to each user. Multistage Parallel Interference Cancellation (PIC) detector is used to estimate and subtract out all Multiple-Access Interference (MAI) for each user in parallel. The performance of the proposed system is compared with the conventional un-coded CDMA systems.