Quad-LED OTFS Modulation in Indoor Visible Light Communication Systems

Sinha, S and Chockalingam, A (2021) Quad-LED OTFS Modulation in Indoor Visible Light Communication Systems. In: 2021 IEEE Global Communications Conference, GLOBECOM 2021, 7 -11 December 2021, Madrid.

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Abstract

In this paper, we investigate orthogonal time frequency space (OTFS) modulation in multi-LED indoor visible light wireless communications. Specifically, we propose two quad-LED OTFS schemes, namely, 1) quad-LED complex modulation OTFS (QCM-OTFS), and 2) spatial modulation dual-LED complex modulation OTFS (SM-DCM-OTFS). The proposed QCM-OTFS scheme sends the magnitudes of real and imaginary parts of complex signals through intensity modulation (IM) and their sign information through spatial indexing of LEDs. The proposed SM-DCM-OTFS scheme sends the magnitude and phase of complex signals (polar representation) through a pair of LEDs and frame indexing across two pairs of LEDs. The proposed schemes do not require Hermitian symmetry and DC bias operations to obtain real positive valued signals suited for IM of LEDs. We obtain upper bounds on the bit error rate (BER) performance of the proposed schemes, which are tight at high signal-to-noise ratios (SNR). Compared to the QCM-OFDM and SM-DCM-OFDM schemes known in the literature, the proposed schemes achieve significantly better BER performance. We also analyze the spatial distribution of the SNR gain in the proposed QCM-OTFS/SM-DCM-OTFS schemes compared to QCM-OFDM/SM-DCM-OFDM schemes using the ratio of minimum distance of normalized received signal sets as a metric. © 2021 IEEE.

Item Type:	Conference Proceedings
Publication:	2021 IEEE Global Communications Conference, GLOBECOM 2021 - Proceedings
Publisher:	Institute of Electrical and Electronics Engineers Inc.
Additional Information:	The copyright for this article belongs to Institute of Electrical and Electronics Engineers Inc.
Keywords:	Bit error rate; Indexing (of information); Light; Light emitting diodes; Modulation; Signal to noise ratio; Visible light communication, Complex modulation; Complex signal; Dual LEDs; Intensity modulations; Multi-LED transmission; Orthogonal time frequency space modulation; Quad-LED OFDM/orthogonal time frequency space; Spatial modulations; Time-frequency space, Orthogonal frequency division multiplexing
Department/Centre:	Division of Electrical Sciences > Electrical Communication Engineering > Electrical Communication Engineering - Technical Reports
Date Deposited:	19 May 2022 07:23
Last Modified:	19 May 2022 07:23
URI:	https://eprints.iisc.ac.in/id/eprint/71905

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