Blind channel estimation for OFDM systems using all entries of covariance matrix

In this paper we considered a non-redundant linear precoding blind channel estimation method for orthogonal frequency-division multiplexing (OFDM) system and proposed an improved algorithm to achieve better performance. A wide range of blind channel estimation methods are based on the covariance matrix of received symbols. In practice, the covariance matrix is unknown and must be estimated through time averaging over received OFDM blocks. To this end, the unknown channel must remain time invariant through the averaging process. Therefore the number of averaging steps is finite and the way of using the covariance matrix components is important in practical applications. In this paper, we propose a new algorithm by an efficient use of covariance matrix components. Simulation results show the proposed method improvement over the other blind estimation methods.