FSK demodulation method using the short-time DFT of power line carrier channels

This paper suggests an FSK demodulation method in the joint time-frequency domain using ST-DFT as the method for communication reliability improvement in power line carrier channels showing very low SNR and frequency selective characteristics. This method is based on noise reduction characteristics in the joint TF (time-frequency) domain, and can be an efficient way for the reduction of non-Gaussian noise. We use noise samples measured in power line carrier channels to make the environment similar to the real channel condition, analyze performance using attenuation factors in real channels of the FSK frequency tone, and validate performance superior to the previous methods. We verify the performance in a real environment through the binary FSK transmitter.