Distributed Space-Time Block Codes for the MIMO Multiple Access Channel

TL;DR

This paper introduces a new family of distributed space-time codes for the MIMO multiple access channel that achieve optimal diversity-multiplexing tradeoff without requiring channel state information at transmitters or user cooperation.

Contribution

It proposes a novel coding scheme for the MIMO MAC that attains the channel's diversity-multiplexing tradeoff under realistic constraints.

Findings

Achieves the Diversity Multiplexing Tradeoff of the channel.

Significant performance gains over orthogonal schemes like time sharing.

Effective without channel state information at transmitters.

Abstract

In this work, the Multiple transmit antennas Multiple Access Channel is considered. A construction of a family of distributed space-time codes for this channel is proposed. No Channel Side Information at the transmitters is assumed and users are not allowed to cooperate together. It is shown that the proposed code achieves the Diversity Multiplexing Tradeoff of the channel. As an example, we consider the two-user MIMO-MAC channel. Simulation results show the significant gain offered by the new coding scheme compared to an orthogonal transmission scheme, e.g. time sharing.