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This paper addresses a theoretical analysis on OFDM/OQAM based transmission in PLC. The authors reveal that Inter-Carrier Interference (ICI) may be a predominant factor to limit the performance comparing with inter-symbol interference (ISI) when the channel has frequency selective behavior. Thus, for the filter design task, more attentions should be paid on its stopband energy than on orthogonality condition, which leads to the so-called Near Perfect Reconstruction (NPR) prototype filter. However, this sort of filter requires a high filter order. On the other hand, the authors introduce an extended point-wise sub-carrier equalizer, named ASCET, to OFDM/OQAM system using short PR filters.
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