Experimental verification of frequency mappings with Hadamard transform for power line communications channel

In recent years, given the prominence of the electrical distribution network, power line communications channel has drawn interests among researchers throughout the globe. M-ary FSK modulation scheme has been extensively used when combined with certain error correcting codes because of its viability and robustness over the power line communications channel. In this paper, we make use of the sign changes property in the Hadamard transform combined together with convolutional codes and M-ary FSK modulation scheme to experimentally use the technique of ”frequency mappings” in a real power line environment. Interesting experimental results show that this technique is very useful without the need of combining coding techniques and modulations that is usually based on the combination of convolutional codes and M-FSK modulation schemes.