Resource allocation and block coding within a three-stage collaborative broadband relay network
SARNOFF'09 Proceedings of the 32nd international conference on Sarnoff symposium
Adaptive MIMO-OFDM system based on QOSTBC/SFBC with improved feedback scheme
WiCOM'09 Proceedings of the 5th International Conference on Wireless communications, networking and mobile computing
Proceedings of the 4th International Conference on Uniquitous Information Management and Communication
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Quasi-orthogonal space-time block codes (QO-STBCs) achieve full code rate at the expense of loss in diversity gain. We propose two feedback methods for QO-STBCs to achieve full diversity and full code rate. In the first method, signals radiated from various antennas are rotated by phasors according to feedback from the receiver, whereas the second method is based upon antenna weighting/selection. For high to moderate feedback error rates, it is demonstrated that the proposed methods outperform the quantized transmit beamformer. The performance improvement is also investigated for these closed-loop methods when the transmitted signal is error control coded.