Coded Quaternary FSK and SFSK Performances Under the Narrow-Band PLC Channel Constraints

In this paper, two decision methods for the quaternary conventional and spread frequency shift keying (4-FSK and 4-SFSK) are detailed and their extension to the coded 4-FSK and 4-SFSK using the permutation coding are proposed. The performance results of the different methods are studied under the real indoor narrowband PLC (NB PLC) channel attenuation and impulse noise. The BER performances of the different techniques prove that the coded 4-FSK using the Select Largest decoding method achieves the best performance results in the NB-PLC environment while having a low complexity, in comparison with SFSK system. The proposed decoding scheme C FSK/SL gives an error floor equal to 2×10
^-4
while SFSK achieves 1.5×10
^-3
under the PLC channel and impulse noise effects.