MIMO channel estimation based on ambiguity resistant filtering and decimated feedback

A power and bandwidth efficient dual channel identification scheme based on decimated signal feedback was recently established by Xu et al for duplex wireless communication systems. Instead of estimating and feeding back channel parameters, the mobile station returns a portion of its received data back to the base station for channel identification. In this paper, we generalize the forward-link channel estimation concept to multiple-input-multiple-output communication systems. More importantly, we incorporate a simple ambiguity resistant FIR filter at the mobile station to simplify the channel identification ambiguity matrix to a scalar. Numerical simulation results are provided to illustrate the performance of the proposed method