Iterative Multiuser Detection and Decoding with Spatially Coupled Interleaving

TL;DR

This paper introduces spatially coupled interleaving to enhance iterative multiuser detection and decoding in MIMO systems, utilizing LMMSE demodulation and sliding window techniques to improve performance and reduce latency.

Contribution

It proposes a novel spatially coupled interleaving scheme combined with sliding window MUDD for MIMO systems, improving performance and latency.

Findings

SC interleaving improves iterative LMMSE MUDD performance

Sliding window MUDD reduces decoding latency

Theoretical and numerical results confirm performance gains

Abstract

Spatially coupled (SC) interleaving is proposed to improve the performance of iterative multiuser detection and decoding (MUDD) for quasi-static fading multiple-input multiple-output systems. The linear minimum mean-squared error (LMMSE) demodulator is used to reduce the complexity and to avoid error propagation. Furthermore, sliding window MUDD is proposed to circumvent an increase of the decoding latency due to SC interleaving. Theoretical and numerical analyses show that SC interleaving can improve the performance of the iterative LMMSE MUDD for regular low-density parity-check codes.