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中文摘要：
针对TDD系统中移动端采用单天线发射，提出2种有效利用精确部分信道信息与统计信息的预编码方法。在无反馈信息的情况下，最大限度地利用精确的信道信息，同时在统计意义上保证其他数据流的速率；在有限反馈情况下，首先利用约束最大似然估计对移动端第2根天线对应信道矢量的方向进行估计，然后利用估计出的信道作SVD分解以确定发射预编码矩阵。仿真验证了所提方法的有效性。
英文摘要：
Concerning the access terminals （AT） use single antenna to transmit, two precoding methods were proposed for TDD systems that combined instantaneous CSI and statistical CSI effectively. When without feedback, instant perfect CSI was utilized to the most, while using the degrees of freedom to guarantee the average throughput of other streams; when with limited feedback, the direction of the channel vector corresponding to the second antenna at AT was firstly estimated using constrained maximum likelihood estimation, and then the optimal precoding matrix was determined through singular value decomposition of the estimated channel matrix. Simulations demonstrate the effectiveness of the proposed methods.
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