Abstract
Recently, multiple-input multiple-output (MIMO) relay technique has been received great attention due to its prominent ability to provide broad coverage and enhance the link reliability and spectral efficiency. In this paper, an overview of optimal design for single user and multiuser non-regenerative MIMO relay systems is proposed. We explore some key designs of source node and destination node as well as relay node processing matrices using minimum mean square error (MMSE) criterion under the transmit power constraints. Simulation results compare different methods in terms of the MSE and bit error rate (BER) performance.
Highlights
Multiple-input multiple-output (MIMO) relay communication, which incorporates relaying technology in multiple-input multiple-output (MIMO) network, has attracted considerable attention in recent years due to its potential ability to extend network coverage and improve link reliability as well as spectral efficiency
We explore some key designs of source node and destination node as well as relay node processing matrices using minimum mean square error (MMSE) criterion under the transmit power constraints
The aim of this paper is to provide an overview of optimal design for single user non-regenerative MIMO relay systems
Summary
Multiple-input multiple-output (MIMO) relay communication, which incorporates relaying technology in MIMO network, has attracted considerable attention in recent years due to its potential ability to extend network coverage and improve link reliability as well as spectral efficiency. The aim of this paper is to provide an overview of optimal design for single user non-regenerative MIMO relay systems. In this paper we will focus on non-regenerative, half-duplex, one-way MIMO relay systems. Initial research on MIMO relay began in single user [2], where the capacity bounds of MIMO relay systems were examined It has been shown in [3] and [4] that performing linear processing at the relay node can outperform the conventional AF relaying in a non-regenerative, known as amplify-and-forward (AF), MIMO relay system. We focus on optimization for single user non-regenerative MIMO relay systems where each node is equipped with multiple antennas supporting multiple data streams. First we introduce an iterative algorithm to find the optimal source preceding matrix and relay amplifying matrix. Notations: boldface letters represent matrices and vectors. ( )H , blkdiag ( ) , I and tr ( ) stand for conjugate transpose, the block diagonal matrix composed of ( ) , the identity matrix and the trace, respectively. e[ ] indicates the statistical expectation
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