No abstract

Adaptive orthogonal frequency division multiplexing(AOFDM) offers reliable data transmission solution for medium voltage powerline communication with low SNR and frequency selective attenuation . Signal-to-noise ratio (SNR) estimator is a key decision parameter in adaptive transmission. In this paper, a virtual carrier based SNR estimation algorithm is proposed. Algorithm can be applied to two cases; one is for data-aided estimation and the other for blind estimation. SNR estimator use virtual carrier in synchronization train sequence or virtual carrier generated by oversampling. Second-moments of received signal is calculated to deduce the result. The performance is compared with other algorithms through Monte-Carlo simulation. The result shows that it is a feasible algorithm for MV powerline communications.