Rate Bounds for MIMO Relay Channels

TL;DR

This paper develops new capacity lower bounds for MIMO relay channels using a partial cooperation strategy, enhancing understanding of cooperative communication in multi-antenna relay systems.

Contribution

It introduces a novel partial cooperation strategy combining message splitting and block-Markov encoding for MIMO relay channels, improving capacity bounds.

Findings

Derived improved lower bounds on capacity for Gaussian MIMO relay channels

Demonstrated the effectiveness of partial cooperation strategies

Enhanced the theoretical understanding of multi-antenna relay communication

Abstract

This paper considers the multi-input multi-output (MIMO) relay channel where multiple antennas are employed by each terminal. Compared to single-input single-output (SISO) relay channels, MIMO relay channels introduce additional degrees of freedom, making the design and analysis of optimal cooperative strategies more complex. In this paper, a partial cooperation strategy that combines transmit-side message splitting and block-Markov encoding is presented. Lower bounds on capacity that improve on a previously proposed non-cooperative lower bound are derived for Gaussian MIMO relay channels.