中文摘要：

针对闭环多天线系统提出一种基于格基约减（LR）的预编码处理机制．接收端对估计出的信道衰落矩阵进行LR量化处理，并向发送端反馈量化信息；发送端据此对发送信号进行预编码．该机制一方面可以使得接收端线性检测，即获得满分集；另一方面，可使等效信道的多个子链路性能接近，避免发送端进行多次调制编码方式选择，有效降低系统复杂度．仿真结果表明，基于LR的预编码在系统吞吐量性能上优于现有的相同码本大小的预编码方案，在信噪比为16dB时，吞吐量的增益为28％．

英文摘要：

A lattice reduction （LR） aided precoding mechanism is proposed for the closed-loop multiple input multiple output （MIMO） systems. At the receiver, the channel matrix is quantified by the LR operation and sent back to the transmitter for precoding. This mechanism achieves full receive diversity gain, and furthermore, it results that different sub-channels of the equivalent channel matrix are of similar performance, it enables the same modulation and coding scheme for different data streams. Simulation shows that the proposed mechanism has better throughput performance than the existing precoding scheme with the same size of codebook, and the gain is up to 28% when signal to noise ratio （SNR） is 16 dB.