异步CDMA系统多径信道的直接盲均衡

Direct Blind Multipath Channel Equalization in Asynchronous CDMA Systems

针对多径CDMA系统提出了一种接收器采用天线阵的基于二阶统计 (SOS)的直接盲MMSE信道均衡方法。与利用信号和噪声的子空间分解估计出信道的脉冲响应的大多数二阶统计方法不同 ,它直接估计维纳 霍夫滤波器中所需的互相关函数。由于不依赖于信号和噪声子空间分解 ,因而对信道阶次的估计误差不敏感。计算机仿真结果表明 。

A new direct blind MMSE channel equalization method based on second order statistics with the use of antennas array in multipath CDMA system is proposed. Unlike many existing SOS methods which rely on signal and noise subspace separation to estimate the channel impulse response, the proposed method directly estimates the cross correlation function needed in Wiener Hopf filters. Since the proposed method does not rely on signal and noise separation, it is insensitive to the channel order estimation error. The simulation results show that the performance of the proposed method is better than that of some existing subspace based methods.