Finite-Alphabet and Decision-Feedback Based Channel Estimation for Space-Time Coded OFDM Systems
基于有限字符特性的空时OFDM系统决策反馈信道估计

A novel blind channel estimation scheme is presented for Space-Time Coded OFDM(STC-OFDM) systems.This scheme is composed of rude channel estimation by exploiting the finite-alphabet property of information signals and fine channel estimation by using decision-directed method,which employs the priori knowledge of the transmitted signals other than the finite-alphabet property of mapping constellation.At the cost of a little more computational complexity,it achieves better performance than the competitive one,hence it is suitable for STC-OFDM systems with a small number of subcarriers in slowly time-varying and not severely frequency selective channels.The scheme is tested with simulations and also compared with the subspace-based channel estimation.