Performance of MIMO Modulation Schemes With Imaging Receivers in Visible Light Communication

Gupta, Amit Kumar and Chockalingam, Ananthanarayanan (2018) Performance of MIMO Modulation Schemes With Imaging Receivers in Visible Light Communication. In: JOURNAL OF LIGHTWAVE TECHNOLOGY, 36 (10). pp. 1912-1927.

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Abstract

In multiple-input multiple-output (MIMO) indoor visible light communication (VLC) systems, the elements of the channel matrix can be highly correlated which is a cause for degraded bit error performance. Imaging receiver techniques can resolve the spatial correlation in VLC channels because of the increased spatial resolution possible in imaging receivers. In this paper, we investigate the performance of MIMO modulation schemes using imaging receivers that employ an imaging lens above the receiving plane to focus the energy from the transmitting LEDs onto the receiving plane. Hemispherical lens and fish-eye lens for imaging are considered in the study. The MIMO modulation schemes considered include spatial multiplexing, generalized spatial modulation, quad-LED complex modulation, and dual-LED complex modulation. Analytical and simulation results show that imaging receivers can provide significant performance gains compared to nonimaging receivers. We analytically capture the high SNR performance of the modulation schemes with nonimaging and imaging receivers by computing the normalized minimum distance of the received signal set. Simulation results validate the analytical results. Using this distance measure, we study the spatial distribution of the best performing modulation scheme with nonimaging and imaging receivers.

Item Type:	Journal Article
Publication:	JOURNAL OF LIGHTWAVE TECHNOLOGY
Publisher:	IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 445 HOES LANE, PISCATAWAY, NJ 08855-4141 USA
Additional Information:	Copy right for the article belong to IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 445 HOES LANE, PISCATAWAY, NJ 08855-4141 USA
Department/Centre:	Division of Electrical Sciences > Electrical Communication Engineering
Date Deposited:	02 Apr 2018 19:59
Last Modified:	02 Apr 2018 19:59
URI:	http://eprints.iisc.ac.in/id/eprint/59432

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