Compressive sensing-based channel bandwidth improvement in optical wireless orthogonal frequency division multiplexing link using visible light emitting diode Yong-Yuk Won1 and Sang Min Yoon2,* 1

Yonsei Institute of Convergence Technology, Yonsei University 85, Songdogwakak-ro, Yeonsu-gu, Incheon, 406-840, South Korea 2 School of Computer Science, Kookmin University 77, Jeongneung-ro, Sungbuk-gu, Seoul, 136-702, South Korea * [email protected]

Abstract: A new technique, which can compensate for the lack of channel bandwidth in an optical wireless orthogonal frequency division multiplexing (OFDM) link based on a light emitting diode (LED), is proposed. It uses an adaptive sampling and an inverse discrete cosine transform in order to convert an OFDM signal into a sparse waveform so that not only is the important data obtained efficiently but the redundancy one is removed. In compressive sensing (CS), a sparse signal that is sampled below the Nyquist/Shannon limit can be reconstructed successively with enough measurement. This means that the CS technique can increase the data rate of visible light communication (VLC) systems based on LEDs. It is observed that the data rate of the proposed CS-based VLC-OFDM link can be made 1.7 times greater than a conventional VLCOFDM link (from 30.72 Mb/s to 51.2 Mb/s). We see that the error vector magnitude (EVM) of the quadrature phase shift keying (QPSK) symbol is 31% (FEC limit: EVM of 32%) at a compression ratio of 40%. ©2014 Optical Society of America OCIS codes: (060.0060) Fiber optics and optical communications; (060.2330) Fiber optics communications; (060.4510) Optical communications.

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#211065 - $15.00 USD Received 28 Apr 2014; revised 6 Jul 2014; accepted 28 Jul 2014; published 12 Aug 2014 (C) 2014 OSA 25 August 2014 | Vol. 22, No. 17 | DOI:10.1364/OE.22.019990 | OPTICS EXPRESS 19990

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1. Introduction A visible light is defined as the electromagnetic radiation whose wavelengths lie in the range that can be detected and interpreted by the human brain. The rapid development in visible light emitting diodes (LEDs) has enabled researchers to use them in many applications that require illumination, such as displays, and signal devices. A visible light communication (VLC) using white LEDs, where the LEDs are used for both illumination and wireless transmission, has been proposed to be used for multimedia mobile services such as indoor positioning, broadband wireless multimedia services (over 1 Gb/s), and inter-vehicular communication [1]. One of the technical requirements for developing these kinds of services in a networkbased VLC is to have a broadband wireless channel bandwidth so that access users would transmit flexibly multimedia data irrespective of its bandwidth. However, it was very difficult to support this because the commercial LED devices have a low 3-dB physical bandwidth (

Compressive sensing-based channel bandwidth improvement in optical wireless orthogonal frequency division multiplexing link using visible light emitting diode.

A new technique, which can compensate for the lack of channel bandwidth in an optical wireless orthogonal frequency division multiplexing (OFDM) link ...
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