Broadband PLC Channel Equalization in the Frequency Domain Based on Complementary Sequences

MOYA, SERGIO; HADAD, MATÍAS; FUNES, MARCOS ALAN; DONATO, PATRICIO; CARRICA, DANIEL OSCAR

IET COMMUNICATIONS

INST ENGINEERING TECHNOLOGY-IET

Lugar: Londres; Año: 2016 vol. 10 p. 1605 - 1613

1751-8628

Multipath channels, like power lines, have a periodic time-variant response that impacts on datatransmission over the grid. Power Line Communications (PLC) performance, in the context of a cyclicprefix single carrier modulation scheme, can benefit from frequency domain equalization techniques. Thiswork proposes a frequency domain dynamic characterization and equalization algorithm based on theproperties of Complementary Sequences (CS). This proposal takes advantage of some CS properties toreduce the complexity of the equalization algorithm by performing all the operations in the frequencydomain, and without the necessity of noise/variance estimators. The proposal is compared to some wellknownmethods like Zero Forcing (ZF) and Minimum Mean-Square Error (MMSE) through thetransmission of data under three different PLC channels. Bit Error Rate (BER) is also measured usingMiddleton Class A impulse noise model (MCA) and the performance of all methods is finally evaluatedunder a time-variant PLC channel model showing the importance of dynamic equalization on PLC systems.Reported computational resources and simulations show that the proposal works four time faster thanMMSE and improves the BER performance by up to 4dB with regard to other methods. In addition, theproposed identification algorithms shows to work properly even in PLC channels with attenuations higherthan 40dB and severe impulse noise scenarios.