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On the Design of Quasi-Orthogonal Space-Time-Frequency Block Code over MIMO OFDM Channel

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3 Author(s)
Abass, E.S. ; Electron. & Commun. Dept., MTI Univ., Cairo, Egypt ; El-Badawy, H.M. ; El-Hennawy, H.M.

In this paper, a Space-Time-Frequency block code (STFBC) based on Quasi-Orthogonal designs is proposed over a frequency selective Rayleigh fading channel. The proposed code achieves rate-one and full diversity offered by the MIMO-OFDM channel. For quasi-static channel over adjacent OFDM symbol durations, as numerical results demonstrate, the proposed code introduces a significant performance gain over the existing STFBC codes in terms of bit error rate performance. By coding across the three dimensions with four frequency diversity branches, the proposed code has a four-wise maximum likelihood decoding. The system performance will be investigated under different delay spread of the channel. In addition, a performance comparison for different FFT size will be presented.

Published in:

Wireless Communications, Networking and Mobile Computing (WiCOM), 2011 7th International Conference on

Date of Conference:

23-25 Sept. 2011