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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16 dB时,吞吐量的增益为28%.
Aiming at closed-loop multi-antenna system, a precoding mechanism based on lattice reduction (LR) is proposed. The receiving end quantizes the estimated channel fading matrix and sends feedback information to the transmitting end. Signal on the one hand, the receiver can achieve linear detection, that is, to obtain full diversity; the other hand, the equivalent channel can be close to the performance of many sub-links to avoid multiple modulation and coding at the sending side to choose from, effective Reduce the system complexity.The simulation results show that the LR-based precoding is superior to the existing precoding scheme with the same codebook size in the system throughput performance, the throughput gain is 28% when the SNR is 16 dB, .