EURASIP Journal on Advances in Signal Processing (Jan 2007)

Improving a Power Line Communications Standard with LDPC Codes

  • Praveen Jain,
  • Wai-Yip Chan,
  • Neng Wang,
  • Christine Hsu

DOI
https://doi.org/10.1155/2007/60839
Journal volume & issue
Vol. 2007

Abstract

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We investigate a power line communications (PLC) scheme that could be used to enhance the HomePlug 1.0 standard, specifically its ROBO mode which provides modest throughput for the worst case PLC channel. The scheme is based on using a low-density parity-check (LDPC) code, in lieu of the concatenated Reed-Solomon and convolutional codes in ROBO mode. The PLC channel is modeled with multipath fading and Middleton's class A noise. Clipping is introduced to mitigate the effect of impulsive noise. A simple and effective method is devised to estimate the variance of the clipped noise for LDPC decoding. Simulation results show that the proposed scheme outperforms the HomePlug 1.0 ROBO mode and has lower computational complexity. The proposed scheme also dispenses with the repetition of information bits in ROBO mode to gain time diversity, resulting in 4-fold increase in physical layer throughput.