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Study on Random-Rotation Quasi-orthogonal Space-Time Block Code |
Deng Dan; Zhu Jin-kang |
PCN&SS Lab, EEIS, USTC, Hefei 230027, China |
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Abstract In order to improve the performance of Quasi-Orthogonal Space–Time Block Code(QO-STBC), a Random-Rotation QO-STBC(RR-QO-STBC) 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 4×1 MIMO QPSK modulation system, under the ML detection rule,the proposed scheme outperforms the conventional QO-STBC about 4dB when the BER is 10-5, and also better than ST-LCP 0.5–1dB when the BER is below 10-4; The new scheme owns similar performance with the CFR scheme when SNR is above 16dB. The performance loss due to the limitation of number of random-rotation matrixes in the practical scenario is investigated. When the number of matrixes is greater than 16, the performance loss is negligible.
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Received: 06 January 2005
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