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中文摘要：
研究表明，有限反馈预编码能有效利用信道信息提高MIMO系统频谱效率，在此基础上，在发射端进行功率控制将使频谱效率得到进一步提升．为了最大化有限反馈MIMO系统的频谱效率，本文提出了一种基于自适应调制的功率分配与预编码方案．为了减少反馈量，该方案通过双码本方式来反馈预编码矩阵和功率控制矢量，并给出了一种基于K-均值聚类的功率码本设计方法．仿真结果表明，该方案的反馈信息量少，且获得了较好频谱性能。
英文摘要：
Recent research results show that limited feedback precoding proves effective in increasing transmission rate in the multiple-input multiple-output（MIMO） system, further performance gain can be achieved if power control is used along with limited feedback precoding at transmitter.In order to maximize the spectral efficiency of the finite-rate feedback MIMO systems, a novel power allocation and precoding scheme is proposed based on adaptive modulation. Furthermore, we feed back the precoding matrix and power vector through double codebooks for reducing the feedback overhead, and a new codebook design approach for power vector based on the clustering analysis is developed. Simulation results show that the proposed scheme greatly improves the spectral efficiency with low feedback overhead.
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