用于MIMO-OFDM系统信号检测的简化V-BLAST方法

V-BLAST是一种用于MIMO-OFDM系统的有效检测方法,但具有较大的计算复杂度.基于MIMO-OFDM系统相邻子载波信道矩阵的充分接近这一特性,本文提出了一种简化V-BLAST方法.在该方法中,系统先对一些子载波信道进行常规V-BLAST检测,然后将由这些检测计算出的信道矩阵的广义逆用于其相邻子载波信道矩阵广义逆的近似计算,从而相当程度地降低了MIMO-OFDM系统进行V-BLAST检测的计算量.简化V-BLAST与常规V-BLAST检测性能比较的仿真实验结果显示,简化V-BLAST方法在相当程度地降低了计算时间的同时取得了非常接近于常规V-BLAST检测的误码性能.

Simplified V-BLAST method for signal detection of MIMO OFDM system

V-BLAST is an effective detection method for MIMO OFDM systems, but has a large computational complexity. Based on the property that the matrices of the neighboring subcarrier channels are close enough in value, this paper proposes a simplified V-BLAST method. In the method, the conventional V-BLAST detections are first made for some subcarrier channels and their pseudoinverses are subsequently used to compute the approximate pseudoinverses of their neighboring channels. Consequently, the computational complexity of the V-BLAST detection in MIMO OFDM system is significantly reduced. Simulation results of the performance comparison between the simplified and the conventional V-BLAST detections show that with a significantly reduced computational time, the simplified method can achieve very close performance to the conventional one.