Iterative multiuser detection for CDMA with FEC: near-single-user performance

TLDR

The study proposes an iterative multiuser receiver for DS‑CDMA with forward error control coding. Derived from the MAP criterion for the joint received signal, the receiver uses single‑user turbo code decoders iteratively to enhance performance while maintaining manageable complexity. Simulations demonstrate that the receiver achieves near single‑user performance even at moderate signal‑to‑noise ratios.

Abstract

This paper introduces an iterative multiuser receiver for direct sequence code-division multiple access (DS-CDMA) with forward error control (FEC) coding. The receiver is derived from the maximum a posteriori (MAP) criterion for the joint received signal, but uses only single-user decoders. Iterations of the system are used to improve performance, with dramatic effects. Single-user turbo code decoders are utilized as the FEC system and a complexity study is presented. Simulation results show that the performance approaches single-user performance even for moderate signal-to-noise ratios.