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第三代移动通信系统中,为了更好地支持高速率数据的传输,在下行链路使用了发送分集技术犤1犦犤2犦。考虑MISO(Multiple-InputSingle-Output)信道,对开环发送分集方案,提出了使用最优功率分配的新方案,并推导出最优功率权值。理论分析表明,与开环发送分集相比,最优功率分配的发送分集的平均信噪比增益为1.25dB。
In the third generation of mobile communication systems, in order to better support the transmission of high-rate data, a transmit diversity technique is used in the downlink (1 犦 犤 2 犦). Considering the MISO (Multiple-InputSingle-Output) channel, we propose a new scheme of optimal power allocation using open-loop transmit diversity scheme and derive the optimal power weight. The theoretical analysis shows that the average signal-to-noise ratio gain of the optimal power allocation transmit diversity is 1.25dB compared with the open loop transmit diversity.