High Rate/Low Complexity Space-Time Block Codes for 2x2 Reconfigurable MIMO Systems

TL;DR

This paper introduces a high-rate, low-complexity space-time block code for 2x2 reconfigurable MIMO systems, leveraging antenna directivity to enhance data rate and reduce decoding complexity.

Contribution

It presents a novel full-rate, full-diversity STBC for reconfigurable MIMO systems with low ML decoding complexity, utilizing antenna directivity for improved performance.

Findings

Achieves a coding rate of two in 2x2 MIMO systems.

Decoding complexity is reduced to order M, where M is the constellation size.

Demonstrates improved performance over existing STBCs in simulations.

Abstract

In this paper, we propose a full-rate full-diversity space-time block code (STBC) for 2x2 reconfigurable multiple-input multiple-output (MIMO) systems that require a low complexity maximum likelihood (ML) detector. We consider a transmitter equipped with a linear antenna array where each antenna element can be independently configured to create a directive radiation pattern toward a selected direction. This property of transmit antennas allow us to increase the data rate of the system, while reducing the computational complexity of the receiver. The proposed STBC achieves a coding rate of two in a 2x2 MIMO system and can be decoded via an ML detector with a complexity of order M, where M is the cardinality of the transmitted symbol constellation. Our simulations demonstrate the efficiency of the proposed code compared to existing STBCs in the literature.