Closed-Loop Space Time Block Coding for High Data Rate With Angle Feedback

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Transmit diversity schemes with multiple streams obtain reliable transmission but suffer from interference when decoding multiple streams simultaneously. In this paper, the authors present closed-loop space-time block codes for multiple streams with limited channel information in order to ease suppressing interference at a receiving station. The proposed scheme includes constellation rotation in Alamouti coding pairs by feedback angle information. The sub-optimum solution for feedback angle is found to maximize the output Signal-to-Noise Ratio (SNR). Simulation results show the proposed scheme with only a few bits feedback achieves nearly full diversity gain with reduced interference.