STBC

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A Multi-Antenna Design Scheme based on Hadamard Matrices for Wireless Communications

Journal Title, Volume, Page: 
British Journal of Mathematics & Computer Science, ISSN: 2231-0851,Vol.: 5, Issue.: 1 (01-15 January)
Year of Publication: 
2014
Authors: 
Yousef Dama
An-Najah National University, Nablus, Palestine
Current Affiliation: 
Department of Chemistry, Faculty of Science, An-Najah National University, Nablus, Palestine
K. O. O. Anoh
Mobile and Satellite Communications Research Centre, University of Bradford, UK
R. A. Abd-Alhameed
O. Ochonogor
Dept of Electronics Engineering, University of Westminster, London, UK
S. M. R. Jones
Mobile and Satellite Communications Research Centre, University of Bradford, UK
M. C. Chukwu
Centre for Satellite Technology Development, NASRDA, Abuja- Nigeria
Preferred Abstract (Original): 

A quasi-orthogonal space time block coding (QO-STBC) scheme that exploits Hadamard matrix properties is studied and evaluated. At first, an analytical solution is derived as an extension of some earlier proposed QO-STBC scheme based on Hadamard matrices, called diagonalized Hadamard space-time block coding (DHSBTC). It explores the ability of Hadamard matrices that can translate into amplitude gains for a multi-antenna system, such as the QO-STBC system, to eliminate some off-diagonal (interference) terms that limit the system performance towards full diversity. This property is used in diagonalizing the decoding matrix of the QO-STBC system without such interfering elements. Results obtained quite agree with the analytical solution and also reflect the full diversity advantage of the proposed QO-STBC system design scheme. Secondly, the study is extended over an interference-free QO-STBC multi-antenna scheme, which does not include the interfering terms in the decoding matrix. Then, following the Hadamard matrix property advantages, the gain obtained (for example, in 4x1 QO-STBC scheme) in this study showed 4-times louder amplitude (gain) than the interference-free QO-STBC and much louder than earlier DHSTBC for which the new approach is compared with

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Improved QO-STBC OFDM System Using Null Interference Elimination

Journal Title, Volume, Page: 
International Journal of Computer Science and Applications 01/2013; 4(8)
Year of Publication: 
2013
Authors: 
Kelvin Anoh
Mobile and Satellite Communications Research Centre, University of Bradford, UK BD7 1DP
Raed Abd-Alhameed
Mobile and Satellite Communications Research Centre, University of Bradford, UK BD7 1DP
Yousef Dama
Mobile and Satellite Communications Research Centre, University of Bradford, UK BD7 1DP
Current Affiliation: 
Department of Telecommunication Engineering, Faculty of Engineering and Information Technology, An-Najah National University, Nablus. Palestine
Steve Jones
Mobile and Satellite Communications Research Centre, University of Bradford, UK BD7 1DP
T. S. Ghazaany
Mobile and Satellite Communications Research Centre, University of Bradford, UK BD7 1DP
J. Rodrigues
Mobile and Satellite Communications Research Centre, University of Bradford, UK BD7 1DP
K. N. Voudouris
Mobile and Satellite Communications Research Centre, University of Bradford, UK BD7 1DP
Preferred Abstract (Original): 
ABSTRACT
The quasi-orthogonal space time block coding (QO-STBC) over orthogonal frequency division multiplexing (OFDM) is investigated. Traditionally, QO-STBC does not achieve full diversity since the detection matrix of QO-STBC scheme is not a diagonal matrix. In STBC, the decoding matrix is a diagonal matrix which enables linear decoding whereas the decoding matrix in traditional QO-STBC does not enable linear decoding. In this paper it is shown that there are some interfering terms in terms of non-diagonal elements that result from the decoding process which limit the linear decoding. As a result, interference from the application of the QO-STBC decoding matrix depletes the performance of the scheme such that full diversity is not attained. A method of eliminating this interference in QO-STBC is investigated by nulling the interfering terms towards full diversity for an OFDM system. It was found that the interference reduction technique permits circa 2dB BER performance gain in QO-STBC. The theoretical and simulation results are presented, for both traditional QOSTBC and interference-free QO-STBC applying OFDM.
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