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Title: Space-time block coding for four transmit antennas with closed loop feedback over frequency selective fading channels
Authors: Toker, Cenk
Lambotharan, Sangarapillai
Chambers, Jonathon
Keywords: Block codes
Channel capacity
Diversity reception
Fading channels
Feedback quantisation
Space-time codes
Transmitting antennas
Issue Date: 2003
Publisher: © IEEE
Citation: TOKER, C., LAMBOTHARAN, S. and CHAMBERS, J., 2003. Space-time block coding for four transmit antennas with closed loop feedback over frequency selective fading channels. IN: IEEE Proceedings Information Theory Workshop, 31 March-4 April, pp. 195-198
Abstract: Orthogonal space-time block coding is a transmit diversity method that has the potential to enhance forward capacity. For a communication system with a complex alphabet, full diversity and full code rate space-time codes are available only for two antennas, and for more than two antennas full diversity is achieved only when the code rate is lower than one. A quasi-orthogonal code could provide full code rate, but at the expense of loss in diversity, which results in degradation of performance. We propose a closed loop feedback scheme for quasi-orthogonal codes which provides full diversity while achieving the full code rate. We investigate, in particular, the performance of this scheme, when the feedback information is quantised and when the fading of the channel is frequency-selective.
Description: This is a conference paper [© IEEE]. It is also available from: http://ieeexplore.ieee.org/servlet/opac?punumber=8588. 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
URI: https://dspace.lboro.ac.uk/2134/5765
ISBN: 0780377990
Appears in Collections:Conference Papers and Contributions (Electronic, Electrical and Systems Engineering)

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