Iterative Detection and Decoding for Multiuser MIMO Systems with Low Resolution Precoding and PSK Modulation

TL;DR

This paper introduces iterative detection and decoding methods for multiuser MIMO systems employing low-resolution precoding and PSK modulation, enhancing performance with novel soft detection techniques and channel coding integration.

Contribution

It proposes three soft detection methods and an iterative detection-decoding scheme for low-resolution precoding with channel coding, including an exact and two approximate extrinsic information computation approaches.

Findings

Superior bit-error-rate performance over traditional AWGN-based systems

Effective integration of channel coding with low-resolution precoding

Reduced computational complexity with approximation methods

Abstract

Low-resolution precoding techniques have gained considerable attention in the wireless communications area recently. Vital but hardly discussed in literature, discrete precoding in conjunction with channel coding is the subject of this study. Unlike prior studies, we propose three different soft detection methods and an iterative detection and decoding scheme that allow the utilization of channel coding in conjunction with low-resolution precoding. Besides an exact approach for computing the extrinsic information, we propose two approximations with reduced computational complexity. Numerical results based on PSK modulation and an LDPC block code indicate a superior performance as compared to the system design based on the common AWGN channel model in terms of bit-error-rate.