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Improvement in the Channel Capacity in Visible Light Emitting Diodes using Compressive Sensing

압축센싱기법을 이용한 가시광 무선링크 전송용량 증가기술 연구

  • Jung, Eui-Suk (Electronics and Telecommunications Research Institute) ;
  • Lee, Yong-Tae (Electronics and Telecommunications Research Institute) ;
  • Han, Sang-Kook (Department of Electrical and Electronic Engineering, Yonsei University)
  • 정의석 (한국 전자통신 연구원 모바일 미디어융합 연구실) ;
  • 이용태 (한국 전자통신 연구원 모바일 미디어융합 연구실) ;
  • 한상국 (연세대학교 전기전자공학부)
  • Received : 2014.06.11
  • Accepted : 2014.10.10
  • Published : 2014.10.31

Abstract

A new technique, which can increase the channel bandwidth in an optical wireless orthogonal frequency division multiplexing (OFDM) link based on a light emitting diode (LED), is proposed. The technique uses adaptive sampling to convert an OFDM signal to a sparse waveform. In compressive sensing (CS), a sparse signal that is sampled below the Nyquist/Shannon limit can be reconstructed successively with sufficient measurements. The data rate of the proposed CS-based visible light communication (VLC)-OFDM link increases from 30.72 Mb/s to 51.2 Mb/s showing an error vector magnitude (EVM) of 31 % at the quadrature phase shift keying (QPSK) symbol.

Keywords

Adaptive sampling;Compressive sensing;L1-minimization;Orthogonal frequency division multiplexing;Visible light communication

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