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Title: Closed-loop extended orthogonal space frequency block coding techniques for OFDM based broadband wireless access systems
Authors: Eltayeb, N.M.
Kassim, S.K.
Chambers, Jonathon
Keywords: Closed-loop (EO-SFBCs)
Phase rotation
Array gain
Coding gain
Diversity gain
Issue Date: 2008
Publisher: © IEEE
Citation: ELTAYEB, N.M., KASSIM, S.K. and CHAMBERS, J.A., 2008. Closed-loop extended orthogonal space frequency block coding techniques for OFDM based broadband wireless access systems. IN: 5th International Conference on Broadband Communications, Networks and Systems, (BROADNETS 2008), London, 8-11 Sept., pp. 426-430.
Abstract: A simple extended orthogonal space-frequency coded multiple input single output (MISO) orthogonal frequency division multiplexing (OFDM) transmitter diversity technique for wireless communications over frequency selective fading channels is presented. The proposed technique utilizes OFDM to transform frequency selective fading channels into multiple flat fading sub-channels on which space-frequency coding is applied. A four-branch transmitter diversity system is implemented without bandwidth expansion and with only one receive antenna. The associated simulations verify that the four-branch transmitter diversity scheme achieves a significant improvement in average bit-error rate (BER) performance. The proposed scheme also outperforms the previously reported scheme due to Yu, Keroueden, and Yuan with only single phase feedback, and that improvement is retained with quantized feedback. Since the angle feedback is on a per tone basis, the feedback information would be too large for any practical OFDM system. However, we adopt a method which exploits the correlation among the feedback terms for the subcarriers, i.e. a group based quantization technique to reduce the feedback overhead significantly, rendering this scheme attractive to broadband wireless access systems. The performance improvement of convolutionally concatenated space-frequency block coding (CCSBC) schemes is also investigated.
Description: This is a conference paper [© IEEE]. It is also available at: http://ieeexplore.ieee.org/ Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE.
Version: Published
DOI: 10.1109/BROADNETS.2008.4769120
URI: https://dspace.lboro.ac.uk/2134/5383
ISBN: 9781424423910
Appears in Collections:Conference Papers and Contributions (Electronic, Electrical and Systems Engineering)

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