LR算法在MIMO-LAS-CDMA系统中的应用

Application of Lattice Reduction Algorithm in MIMO-LAS-CDMA Systems

在多入多出系统中,使用减格算法进行信号检测,如果结合多用户检测算法可以达到接近极大似然检测的性能。为了达到这个目的,给定多入多出系统的信道矩阵需要转化成一个正交的矩阵,以减小或消除信号检测过程中常规迫零算法对噪声的放大作用。为此,将减格算法与常规迫零检测算法结合,分析和仿真了接收机中使用减格辅助的迫零算法在M IMO-LAS-CDMA系统中的性能。仿真结果显示,使用这个新算法在复杂度开销增加不大的情况下,性能上超过了使用迫零算法接收机的系统。

LR（Lattice-Reduction） -aided algorithm for signal detection in MIMO （ Multi-Input Multi-Output） systems has been proposed recently. The near maximum-likelihood detection performance can be achieved by employing the LR-aided multiuser detection algorithms. The channel matrix of the MIMO systems needs to be changed into an orthogonal matrix, so the noise enhancement by using ZF （Zero-Forcing） algorithm can be reduced. In this paper, we adopted the LR-aided ZF algorithm to MIMO-LAS-CDMA systems. The BER performance of the system employing LR-ZF receiver is simulated and analyzed. The simulation results show that the BER （Bit-Error-Rate） performance of the system employing LR-ZF receiver outperformed that of ZF receiver distinctly at the expense of little increase of computation complexity.