A Novel Random-Rotation Quasi-Orthogonal Space-Time Block Code

A novel random-rotation quasi-orthogonal spacetime block code(RR-QO-STBC) transmission scheme is proposed. This transmission diversity scheme randomly rotates every information symbol vector, thus the inter-symbol interference between multi-antennas of QO-STBC is randomized and alleviated. Simulation results suggest, in the high SNR scenario, under the ML detection rule, the proposed scheme outperforms the conventional QO-STBC by about 4dB, and still better than ST-LCP 0.5-1dB. The new scheme owns similar performance with the Constellation Fixed Rotation(CFR) scheme when SNR is above 16dB. The performance loss due to the limitation of number of RandomRotation matrixes in the practical scenario is investigated. When the number of matrixes is greater than 16, the performance loss is negligible.