一种利用接收信号冗余特征的基于子空间的盲信道估计算法

提出了一种基于子空间OFDM盲信道估计算法的改进算法。由于OFDM传输方程不能直接推导子空间算法，故给出了一种新的方法对OFDM传输方程作矩阵变换，该方法利用接收信号的冗余特性，得到一个结构简单的新方程，经理论分析证明，该算法对于循环前缀CP（Cyclic Prefix）的长度没有严格要求，大于或小于信道阶数，皆可以成立。

Subspace-based Blind Channel Estimation Algorithm for OFDM (Orthogonal Frequency Division Multiplexing) System by Exploiting Redundancy of Received Signals

This paper puts forward an improved subspace-based blind channel estimation algorithm. Because the subspace algorithm can＇ t be directly deduced by using OFDM transmission equation, a new method, which is used to make the matrix transformation for OFDM transmission equation, utilizes the redundancy of received signals,and a new subspace-based blind channel estimation algorithm is obtained. Theoretic analysis shows that the algorithm still works for OFDM system with sufficient CP and insufficient CP.