A simple channel estimator for space-time coded OFDM systems in rapid fading channels.
A simple channel estimator for space-time coded orthogonal frequency division multiplexing (OFDM) systems in rapid fading channels is proposed. The channels at the training bauds are estimated using the EM (expectation-maximization) algorithm, while the channels at the data bauds are estimated based on the method for modelling the time-varying channel as the linear combination of several time-invariant "Doppler channels". Computer simulations showed that this estimator outperforms the decision-directed tracking in rapid fading channels and that the performance of this method can be improved by iteration.
Shan
Shu-wei
SW
Department of Electronic Engineering,Shanghai Jiaotong University,Shanghai 200030,China. sswly@yahoo.com.cn
Luo
Han-wen
HW
Song
Wen-tao
WT
D000465:Algorithms; D003198:Computer Simulation; D016247:Information Storage and Retrieval / Q000379:methods*; D016013:Likelihood Functions; D015233:Models, Statistical; D012815:Signal Processing, Computer-Assisted; D013685:Telecommunications