空时编码多载波码分多址MIMO系统下行频率选择性信道盲估计

基于子空间方法的无线信道盲估计由于其算法的固有特性,使得估计结果与实际信道之间存在一个不确定复系数,无法得到无线信道的精确估计。在利用子空间分解方法对空时编码多输入多输出MC-CDMA系统下行频率选择性信道盲估计的基础上,利用发射符号的有限码集特性,将单载波系统下的模糊复系数盲辨识方法推广到多载波多输入多输出系统,从而得到信道的精确估计。Monte-Carlo仿真表明,在信噪比较低的情况下,本方法的信道估计误差仍然较小。

Downlink frequency-selective fading channel blind estimation for space-time coded MC-CDMA MIMO systems

Since inherent characteristic of blind channel estimation algorithm based on subspace method, there existed an ambiguous complex coefficient between estimated channels and real channels. The downlink frequency-selective fading channel estimation problem of the space-time coded (STC) multiple-input multiple-output (MIMO) MC-CDMA systems were focused on. Based on subspace decomposition technique and the subspace orthogonality property, A blind accurate estimation scheme of downlink frequency-selective fading channels for multiuser STC MIMO MC-CDMA systems were derived. Thus, the blind identification method of ambiguous complex coefficient from single carrier systems to multi-carrier MIMO systems were generalized. Monte Carlo simulations show that when the SNR is low, the error of channel estimation is relatively small.