Cellular Multi-User Two-Way MIMO AF Relaying via Signal Space Alignment: Minimum Weighted SINR Maximization

TL;DR

This paper proposes a novel MIMO transceiver design for cellular two-way relaying systems that uses signal space alignment to manage interference, enhancing spectral efficiency and user performance.

Contribution

It introduces a transceiver design algorithm leveraging signal space alignment for interference mitigation in two-way MIMO relaying, improving spectral efficiency and user-specific QoS.

Findings

Achieves superior error rate performance.

Provides higher average data rates.

Effectively manages multi-user interference.

Abstract

In this paper, we consider linear MIMO transceiver design for a cellular two-way amplify-and-forward relaying system consisting of a single multi-antenna base station, a single multi-antenna relay station, and multiple multi-antenna mobile stations (MSs). Due to the two-way transmission, the MSs could suffer from tremendous multi-user interference. We apply an interference management model exploiting signal space alignment and propose a transceiver design algorithm, which allows for alleviating the loss in spectral efficiency due to half-duplex operation and providing flexible performance optimization accounting for each user's quality of service priorities. Numerical comparisons to conventional two-way relaying schemes based on bidirectional channel inversion and spatial division multiple access-only processing show that the proposed scheme achieves superior error rate and average data rate performance.