Non-iterative Joint Detection-Decoding Receiver for LDPC-Coded MIMO Systems Based on SDR

TL;DR

This paper introduces a non-iterative joint detection-decoding receiver for LDPC-coded MIMO systems that leverages semi-definite relaxation (SDR) with code constraints, significantly improving detection reliability and decoding performance.

Contribution

The paper proposes a novel joint SDR detector that incorporates FEC code information directly into the detection process, enhancing performance over existing methods.

Findings

Outperforms existing SDR-based detectors in reliability and accuracy

Provides improved soft information for downstream decoding

Achieves substantial gain in detection-decoding performance

Abstract

Semi-definite relaxation (SDR) detector has been demonstrated to be successful in approaching maximum likelihood (ML) performance while the time complexity is only polynomial. We propose a new receiver jointly utilizing the forward error correction (FEC) code information in the SDR detection process. Strengthened by the code constraints, the joint SDR detector provides soft information of much improved reliability to downstream decoder and therefore outperforms existing receivers with substantial gain.