Blind channel estimation for indoor optical wireless communication systems

In this paper a blind estimation method based on second order statistics is described for the estimation of channel impulse response of indoor optical wireless communication system. Unlike the other training sequence based estimation methods this method does not require a training sequence to be transmitted with the transmission data to estimate instantaneous channel impulse response. The elimination of training sequence from data frames increases the transmission capability. We perform a computer simulation to compare the performance of blind estimation method with the existing non-blind estimation methods for indoor optical wireless channels. It has been found that although the performance of blind estimation method is inferior at low SNR but at high SNR its performance is comparable to non-blind methods.