Adaptive Delay-Tolerant DSTBC in Opportunistic Relaying Cooperative MIMO Systems

TL;DR

This paper introduces an adaptive delay-tolerant DSTC scheme with feedback for cooperative MIMO networks, improving performance and addressing delay issues using stochastic gradient algorithms.

Contribution

It proposes a novel delay-tolerant DSTC scheme with adjustable code matrices and low-complexity algorithms for cooperative MIMO systems.

Findings

Significant performance improvements over existing DSTC schemes.

Effective delay mitigation in cooperative MIMO systems.

Reduced computational complexity of parameter estimation.

Abstract

An adaptive delay-tolerant distributed space-time coding (DSTC) scheme with feedback is proposed for two-hop cooperative multiple-input multiple-output (MIMO) networks using an amplify-and-forward strategy and opportunistic relaying algorithms. Maximum likelihood receivers and adjustable code matrices are considered subject to a power constraint. In the proposed delay-tolerant DSTC scheme, an adjustable code matrix is employed to transform the space-time coded matrices at the relay nodes. Stochastic gradient algorithms are developed with reduced computational complexity to estimate the parameters of the code matrix. Simulation results show that the proposed algorithms obtain significant performance gains and address the delay issue in cooperative MIMO systems as compared to existing DSTC schemes.