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DOI: 10.14569/IJACSA.2013.040834
PDF

Improved QO-STBC OFDM System Using Null Interference Elimination

Author 1: K. O. O. Anoh
Author 2: R. A. Abd-Alhameed
Author 3: Y. A. S. Dama
Author 4: S. M. R. Jones
Author 5: T. S. Ghazaany
Author 6: J. Rodrigues
Author 7: K. N. Voudouris

International Journal of Advanced Computer Science and Applications(IJACSA), Volume 4 Issue 8, 2013.

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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 QO-STBC and interference-free QO-STBC applying OFDM

Keywords: QO-STBC; STBC; OFDM; Decoding matrix; Null-Interference; Interference;

K. O. O. Anoh, R. A. Abd-Alhameed, Y. A. S. Dama, S. M. R. Jones, T. S. Ghazaany, J. Rodrigues and K. N. Voudouris, “Improved QO-STBC OFDM System Using Null Interference Elimination” International Journal of Advanced Computer Science and Applications(IJACSA), 4(8), 2013. http://dx.doi.org/10.14569/IJACSA.2013.040834

@article{Anoh2013,
title = {Improved QO-STBC OFDM System Using Null Interference Elimination},
journal = {International Journal of Advanced Computer Science and Applications},
doi = {10.14569/IJACSA.2013.040834},
url = {http://dx.doi.org/10.14569/IJACSA.2013.040834},
year = {2013},
publisher = {The Science and Information Organization},
volume = {4},
number = {8},
author = {K. O. O. Anoh and R. A. Abd-Alhameed and Y. A. S. Dama and S. M. R. Jones and T. S. Ghazaany and J. Rodrigues and K. N. Voudouris}
}



Copyright Statement: This is an open access article licensed under a Creative Commons Attribution 4.0 International License, which permits unrestricted use, distribution, and reproduction in any medium, even commercially as long as the original work is properly cited.

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