The traditional binary frequency shift keying (2FSK) technology cannot adapt to the attenuation characteristic of low-voltage power line carrier (LPLC) channel.In order to solve this problem, by using discrete short time Fourier transform and high-order moments theory,a novel signal-to-noise estimation algorithm,which can be used in time-frequency analysis,was proposed. Based on it,a multi-carrier binary frequency shift keying technique based on time-frequency analysis was implemented.Simulation results showed that the precision of the SNR estimation could meet the need of the LPLC communication system in practice and the multi-carrier system gains lower error rate than the single-carrier system while they are interfered by the same noise.
