【摘要】 利用循环前缀(CP)引入的信息冗余,提出一种利用接收信号的二阶统计特性实现正交频分复用(OFDM)系统信道盲估计的子空间算法.由于OFDM传输方程不能直接推导子空间算法,故首先给出一种新的方法对OFDM传输方程作矩阵变换,从而得到一个结构简单的新方程,基于此推导出信道估计子空间算法.该算法不需要改变OFDM系统结构,不受信道零点位置的限制,在信道过估计的情况下也适用.更多还原

【Abstract】 Exploiting the redundancy introduced by the cyclic prefix (CP), a subspace-based algorithm for blind channel estimation using second-order statistics was proposed in OFDM systems. Because the transmission equation of OFDM systems does not exactly have the desired structure to directly derive a subspace algorithm, a new matrix transform on the equation is proposed, then a blind subspace-based algorithm is developed. The algorithm does not change the existing OFDM systems and is not sensitive to the channel zero locations. It is robust to channel order overdetermination.更多还原