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.
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.
出处
《上海交通大学学报》
EI
CAS
CSCD
北大核心
2004年第z1期6-9,共4页
Journal of Shanghai Jiaotong University
关键词
正交频分复用
盲辨识
子空间算法
orthogonal frequency division multiplexing (OFDM)
blind identification
subspace algorithm
