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

Abiola G Bolaji, Thokozani Shongwe


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.

Full Text:



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