Semi-blind Channel Estimation Based on Low-Voltage Narrowband Power Line Carrier Communication

In allusion to the frequency-selective transmission characteristics of low-voltage power line carrier channel,a semi-blind channel estimation method is proposed.In the proposed method the transmitted orthogonal frequency division multiplexing signal is pre-coded by a set of orthogonal sequences with constant amplitudes in both time-domain and frequency-domain,so only utilizing one pilot sub-carrier the frequency response of all sub-carriers can be estimated.Results of the simulation based on the experiment research on channel characteristics of power line carrier communication system show that the variation of frequency-selective fading of low-voltage power line channel can be effectively traced by the proposed method can effectively track,thus the bit error rate performance of low-voltage power line carrier channel can be evidently improved.