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中文摘要：
时分复用（TDD）模式的通信系统可以通过有效利用信道的互易性，即通过上行链路对下行信道信息进行估计，并利用估计得到的信息对MIMO通信系统进行预处理或者预编码，从而进一步提升MIMO系统的信道容量和性能．、然而，对于频分复用（FDD）的通信系统，由于上下行频段的不对称使得信道互易性原则不再适用，此时欲对信道进行预处理，则必须通过终端对下行信道信息进行上行反馈。反馈方式可分为直接对下行信道信息进行量化反馈的显式反馈和将量化后的信道空间以码本形式进行反馈的隐式反馈。对信道空间量化的隐式反馈进行研究，并在此基础上提出了一种双码本预编码的方法，并进一步对所提方案进行了理论分析和仿真验证。
英文摘要：
For the time-division multiplexing （TDD） communication systems through the effective use of channel reciprocity, that is, estimating the downlink channel information by uplink channel and using the information to do pre-process or precoding on the MIMO communication systems, the channel capacity of MIMO systems and its performance can be further enhanced. However, for frequency-division multiplexing （FDD） communication system due to the asymmetric of the uplink and downlink channels, the principle of reciprocity is no longer applicable in this case. If people want to pre-process the downlink channel, the channel information feedback by the UE side through nplink channel is necessary. Feedback method can he divided into explicit feedback with direct feedback of quantified channel information and the implicit feedback with a codebook to describe the quantized channel information. Based on implicit feedback method we proposed a feedback method with dual-codebook, on this basis, the theoretical analysis according to simulation result was done further.
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