Expectation Maximization Based on Semi-Blind Channel Estimation Algorithm in OFDM Systems
Tian Yong-yi · Journal of Beijing Electronic Science and Technology Institute · 2007
Aiming at the deficiencies of high complexity, low precision and slow convergence, in the orthogonal frequency division multiplexing (OFDM) conventional blind channel estimation method, an expectation maximization based semi-blind channel estimation algorithm was researched. The simulation results show that the EM based semi-blind channel estimation algorithm can overcome these deficiencies of the conventional blind channel estimation method and yield a 2dB SNR improvement compared to the conventional channel estimation algorithms based on pilot assisted.