ORTHOGONALIZATION OF QUASI-ORTHOGONAL SPACE-TIME BLOCK CODES IN MULTIPATH FADING ENVIRONMENTS BY USING FEEDBACK (WedAmOR2)

Author(s) : Cenk Toker (King's College London, United Kingdom) Sangarapillai Lambotharan (King's College London, United Kingdom) Jonathon A. Chambers (Cardiff University, United Kingdom)

Abstract : To combat the detrimental effect of the frequency-selective fading channel and the intersymbol interference in quasi-orthogonal space-time block codes (QO-STBCs), two feedback algorithms combined with multicarrier modulation scheme are proposed. One of the algorithms rotates the phase of the transmitted signal from certain antennas in a prescribed way. The other algorithm is based on selecting certain antennas and switching-off the others according a channel quality measure. A highly practical setup with only two bits of feedback can achieve considerable performance gain over the open-loop QO-STBC.

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