LTE系统基于格基约减辅助V-BLAST算法

摘要

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.%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。