Best linear unbiased channel estimation for frequency selective multipath channels with long delay spreads

We provide an iterative channel impulse response (CIR) estimation algorithm for communication systems which utilize a periodically transmitted training sequence within a continuous stream of information symbols. This iterative procedure calculates the (semi-blind) best linear unbiased estimate (BLUE) of the CIR. We first provide a formulation of the received data and correlation processing with the adjacent information symbol correlation taken into account, and we then present the connections of the correlation based CIR estimation scheme to the ordinary least squares CIR estimation. Simulation results are provided to demonstrate the performance of the novel algorithm.