Coded index modulation for non-DC-biased OFDM in multiple LED visible light communication

Alaka, S. P. ; Narasimhan, T. Lakshmi ; Chockalingam, A. (2016) Coded index modulation for non-DC-biased OFDM in multiple LED visible light communication In: 2016 IEEE 83rd Vehicular Technology Conference (VTC Spring), 15-18 May 2016, Nanjing, China.

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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 or Workshop Item (Paper)
Source:Copyright of this article belongs to Institute of Electrical and Electronics Engineers.
ID Code:102106
Deposited On:24 Mar 2017 11:33
Last Modified:24 Mar 2017 11:33

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