在实际系统中，由于反馈信道容量有限，采用的是基于码本的有限反馈预编码技术。
In practical systems, limited feedback precoding based on codebook is used, due to the limited capacity of the feedback channel.
针对MIMO空分复用系统中利用信道状态信息自适应选择最佳预编码方案能有效提高系统性能，提出了一种基于有限比特反馈的预编码联合优化算法。
In MIMO spatial multiplexing system, channel state information(CSI) is very useful for adaptive selection of the optimal precoding schemes which can enhance system performance effectively.
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