LTE系统基于格基约减辅助V-BLAST算法  

Lattice Reduction Aided V-BLAST Algorithm in LTE System

作　　者：高明[1] 刘金铸[1] 

机构地区：[1]南京信息工程大学电子与信息工程学院,南京210044

出　　处：《计算机系统应用》2015年第5期124-128,共5页Computer Systems & Applications

摘　　要：LTE作为以OFDM-MIMO为主要技术特征的第四代移动通信,它的终端信号检测实现比较困难,这就需要一种性能好、复杂度低的检测算法来实现.格基约减是一种在接收端对信道矩阵进行预处理,可以消除子信道间干扰和抑制噪声的增强.本文在已有的格基约减ELLL算法的基础上,提出一种限制条件更为宽松的对角格约减算法(DR).该算法的计算复杂度要低于ELLL算法.在该算法的基础上,结合传统V-BLAST和K-best算法思想,给出了一种基于格基约减辅助的V-BLAST算法.仿真结果表明,在LTE系统中该算法能够在复杂度较低的情况下,性能更接近ML算法.LTE is the fourth generation mobile communication dominated by OFDM-MIMO technical features. Signal detection in the terminal of it needs a kind of detection algorithm with lower complexity and better performance to achieve. A lattice reduction aided algorithm is a preprocessing technique that it enables the columns of channels matrix to be approximately orthogonal. It can eliminate the interference among these Sub-channels and reduce the effect of the enhancement of noise. On the basis of ELLL, a weaker reduction criterion, called diagonal reduction with potentially lower computational cost than the ELLL, is proposed, and we further put forward a new lattice reduction aided detection algorithm which associated K-best with V-BLAST on the basis of DR. As depicted in our simulation, the performance of the algorithm which is proposed is close to that of ML with a lower computational complexity.

关 键 词：多输入多输出 最大似然检测 格基约减 串行干扰消除 

分 类 号：TN929.5[电子电信—通信与信息系统]