Title

Generalised prefix for space–time block-coded orthogonal frequency division multiplexing wireless systems over correlated multiple-input multiple-output channels

Document Type

Article

Publication Date

6-12-2014

Publication Source

IET Communications

Volume

8

Issue

9

Inclusive pages

1589-1598

DOI

10.1049/iet-com.2013.1166

Publisher

The Institution of Engineering and Technology

Place of Publication

United Kingdom

ISBN/ISSN

1751-8628

Peer Reviewed

yes

Abstract

Space–time block coding (STBC) orthogonal frequency division multiplexing (OFDM) is known to improve the reliability of broadband communication over wireless links. However, this technique suffers from a performance loss when the multiple-input multiple-output (MIMO) channel is correlated. This study addresses this problem. A STBC-OFDM system is proposed that is based on convolution that is skew-circular, rather than circular. This skew-circular convolution leads to one additional degree of freedom. The additional parameter can be optimised leading to improved performance for MIMO channels that are correlated. The skew-circular convolution is achieved via the introduction of a generalised prefix. The simulation results are given, illustrating the performance improvement of the proposed STBC-OFDM system. Furthermore, the proposed system is shown to be robust when channel state information is known not precisely, but imperfectly.

Keywords

OFDM modulation, wireless channels, space-time block codes, telecommunication network reliability, channel coding, radio links, MIMO communication

Disciplines

Engineering

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