Selected subcarriers QPSK-OFDM transmission schemes to combat frequency disturbances

Victor N. Papilaya, Thokozani Shongwe, A. J.Han Vinck, Hendrik C. Ferreira

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

26 Citations (Scopus)

Abstract

To combat the impairments caused by frequency disturbances in the power line communications (PLC), a modified conventional QPSK-OFDM transmission scheme is presented. The idea of this scheme is to first group the N OFDM subcarriers into groups of and then transmit data by selecting a subset of the subcarriers in the group. Real and imaginary parts of QPSK symbols are independently assigned to the selected subcarriers in a group, such that the minimum squared Euclidean distance is maximised. With this kind of symbol assignment to subcarriers our scheme has no net loss in terms of SNR requirements, in AWGN, in comparison to the conventional QPSK-OFDM, even though it has half the data rate of the conventional QPSK-OFDM. We refer to the conventional QPSK-OFDM as Scheme A. Our scheme displays a superior performance over Scheme A and another scheme (Scheme B), in the presence of frequency disturbances and also frequency selective fading noise. We further modify Scheme B and come up with additional two new QPSK-OFDM schemes that have better performance than Scheme B in AWGN and impulse noise. To encode, we apply a (n, k) RS code and a simple permutation code on the conventional QPSK-OFDM scheme, which significantly improves the decoder's performance in the presence of frequency disturbances. A simple narrow band noise model is developed and presented.

Original languageEnglish
Title of host publication2012 IEEE International Symposium on Power Line Communications and Its Applications, ISPLC 2012
Pages200-205
Number of pages6
DOIs
Publication statusPublished - 2012
Event2012 16th IEEE International Symposium on Power Line Communications and Its Applications, ISPLC 2012 - Beijing, China
Duration: 27 Mar 201230 Mar 2012

Publication series

Name2012 IEEE International Symposium on Power Line Communications and Its Applications, ISPLC 2012

Conference

Conference2012 16th IEEE International Symposium on Power Line Communications and Its Applications, ISPLC 2012
Country/TerritoryChina
CityBeijing
Period27/03/1230/03/12

Keywords

  • QPSK-OFDM
  • Selected subcarriers
  • concatenated RS-Permutation codes
  • frequency disturbances
  • narrow band noise model

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Fuel Technology

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