Coded Index Modulation for Non-DC-Biased OFDM in Multiple LED Visible Light Communication

Alaka, SP and Narasimhan, Lakshmi T and Chockalingam, A (2016) Coded Index Modulation for Non-DC-Biased OFDM in Multiple LED Visible Light Communication. In: IEEE 83rd Vehicular Technology Conference (VTC Spring), MAY 15-18, 2016, Nanjing, PEOPLES R CHINA.

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Abstract

Use of multiple light emitting diodes (LED) is an attractive way to increase spectral efficiency in visible light communications (VLC). A non-DC-biased OFDM (NDC OFDM) scheme that uses two LEDs has been proposed in the literature recently. NDC OFDM has been shown to perform better than other OFDM schemes for VLC like DC-biased OFDM (DCO OFDM) and asymmetrically clipped OFDM (ACO OFDM) in multiple LEDs settings. In this paper, we propose an efficient multiple LED OFDM scheme for VLC which uses coded index modulation. The proposed scheme uses two transmitter blocks, each having a pair of LEDs. Within each block, NDC OFDM signaling is done. The selection of which block is activated in a signaling interval is decided by information bits (i.e., index bits). In order to improve the reliability of the index bits at the receiver (which is critical because of high channel correlation in multiple LEDs settings), we propose to use coding on the index bits alone. We call the proposed scheme as CI-NDC OFDM (coded index NDC OFDM) scheme. We present the performance results of CI-NDC OFDM scheme with the index bits coded by (i) LDPC and (ii) Walsh-Hadamard codes. Simulation results show that, for the same spectral efficiency, CI-NDC OFDM that uses coding on the index bits performs better than NDC OFDM.

Item Type:	Conference Paper
Series.:	IEEE Vehicular Technology Conference Proceedings
Additional Information:	Copy right for this article belongs to the IEEE, 345 E 47TH ST, NEW YORK, NY 10017 USA
Department/Centre:	Division of Electrical Sciences > Electrical Communication Engineering
Date Deposited:	07 Dec 2016 05:19
Last Modified:	07 Dec 2016 05:19
URI:	http://eprints.iisc.ac.in/id/eprint/55491

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