Advanced A-law employing nonlinear distortion reduction in DCO-OFDM systems

Xiaojing Zhang, Peng Liu, Jiang Liu, Song Liu

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2 Citations (Scopus)

Abstract

In this paper, an advanced A-law nonlinear companding algorithm is employed to reduce the nonlinear distortions from the light emitting diode (LED) on visible light communication (VLC) systems. The nonlinear transfer characteristics of LEDs are not identical. But the transfer effect of an LED can be modeled as a linear transfer range with the maximum and minimum forward voltages. Therefore, the signal will be truncated when the signal amplitude is larger than the maximum limit or smaller than the minimum limit. The advanced A-law companding algorithm can concentrate the signal amplitude to the limited linear transfer range and decrease the truncation distortion. We evaluate the performance of the proposed advanced A-law companding algorithm comparing with typical A-law and uncompanded schemes via simulations in the direct current biased optical orthogonal frequency division multiplexing (DCO-OFDM) system. Experimental results demonstrate that the advanced A-law companding algorithm can effectively alleviate the nonlinear distortion of the DCO-OFDM system in terms of system bit error ratio (BER) performances.

Original languageEnglish
Title of host publication2015 IEEE/CIC International Conference on Communications in China - Workshops, CIC/ICCC 2015
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages184-188
Number of pages5
ISBN (Electronic)9781467397018
DOIs
Publication statusPublished - 2017 Jun 28
Event2015 IEEE/CIC International Conference on Communications in China - Workshops, CIC/ICCC 2015 - Shenzhen, China
Duration: 2015 Nov 22015 Nov 4

Other

Other2015 IEEE/CIC International Conference on Communications in China - Workshops, CIC/ICCC 2015
CountryChina
CityShenzhen
Period15/11/215/11/4

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Keywords

  • advanced A-law
  • DCO-OFDM
  • light emitting diode
  • nonlinear distortion
  • visible light communication

ASJC Scopus subject areas

  • Computer Networks and Communications
  • Hardware and Architecture
  • Signal Processing

Cite this

Zhang, X., Liu, P., Liu, J., & Liu, S. (2017). Advanced A-law employing nonlinear distortion reduction in DCO-OFDM systems. In 2015 IEEE/CIC International Conference on Communications in China - Workshops, CIC/ICCC 2015 (pp. 184-188). [7961604] Institute of Electrical and Electronics Engineers Inc.. https://doi.org/10.1109/ICCChinaW.2015.7961604