Performance comparison of Modified BPSK-OFDM and QFSK-OFDM in PLC Channel noise

The article describes and compares two OFDMbased communications schemes for reducing the effects of thecombination of Narrowband Interference (NBI) and ImpulsiveNoise (IN), which are noise types typical in Power Line Communication(PLC). The two schemes are Modified BPSK-OFDM(called MBPSK, for brevity) and QFSK-OFDM (called QFSK,for brevity), which are non-conventional OFDM schemes. Wegive a description of the two schemes, showing how they arederived and also show their similarities and eventually comparetheir performances. Performance simulation results, in termsof bit error rate, are given to compare the systems under theeffect of IN and NBI. The popular Middleton Class A modelis used for modelling IN. The results show that MBPSK schemeoutperforms the QFSK scheme in terms of minimum distance,and hence in terms of bit error probability when no preprocessingis performed. However, under clipping/nulling, both schemeseventually reach the bit error rate floor