BPSK-OFDM versus QFSK-OFDM in combating the effects of narrowband interference and impulsive noise in power line communication

Abstract: This work serves to demonstrate the use of hybrid QFSK-OFDM and modified BPSK-OFDM in combating the effects of Narrowband Interference (NBI) and Impulsive noise (IN) as a mixture in Power Line Communication channel. Therefore, in this paper we demonstrate the superiority of modified BPSK-OFDM over QFSK-OFDM and over conventional BPSK-OFDM. The performance analysis of the system is carried out by Matlab simulations whereby the noise models used are the Middleton Class A for IN and NBI models as found in literature. The simulations show modified BPSK-OFDM to have better performance of 5 dB in terms of SNR as compared to QFSK-OFDM and 3 dB better than the conventional BPSK-OFDM

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

Performance comparison of modified BPSK-OFDM and QFSK-OFDM in PLC channel noise

Abstract: The article describes and compares two OFDM based communications schemes for reducing the effects of the combination of Narrowband Interference (NBI) and Impulsive Noise (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. We give a description of the two schemes, showing how they are derived and also show their similarities and eventually compare their performances. Performance simulation results, in terms of bit error rate, are given to compare the systems under the effect of IN and NBI. The popular Middleton Class A model is used for modelling IN. The results show that MBPSK scheme outperforms the QFSK scheme in terms of minimum distance, and hence in terms of bit error probability when no preprocessing is performed. However, under clipping/nulling, both schemes eventually reach the bit error rate floor