V-BLAST OFDM系统中一种稳健的检测算法

A robust detection algorithm for V-BLAST OFDM systems

针对实际中信道估计存在误差,从阵列信号处理的角度提出了V-BLAST(Vertical Bell Labs Layered Space-Time)OFDM系统中一种稳健的检测算法.将接收数据的协方差矩阵进行特征值分解,得到信号子空间,将存在估计误差的信道矢量向该子空间投影,就可以得到较为准确的信道矢量,然后利用波束形成计算出检测滤波器的系数.仿真结果表明,当信道估计存在误差时,该方法性能显著优于ZF(Zero-Forcing)和MMSE(Minimum Mean Square Error)算法.

A robust detection algorithm based on the array signal processing theory is proposed for V- BLAST（Vertical Bell Labs Layered Space-Time） OFDM systems with a channel estimation error. The covariance matrix of receive data is eigendecomposed, and the signal subspace is obtained. Then the channel vector （with error） is projected onto the subspace, and more accurate channel vector is obtained. According to the beamforming algorithm, the detection filter coefficients are calculated. Simulation results show that the performance of the proposed algorithm is much better than ZF（Zero-Forcing） and MMSE（Minimum Mean Square Error） algorithms.