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: UNSPECIFIED.

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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 Paper
Publication:	Proceedings - IEEE Global Communications Conference, GLOBECOM
Additional Information:	The copyright for this article belongs to et al.HuaweiIntelQualcommVodafoneZTE
Keywords:	Bit error rate; Indexing (of information); Light; Light emitting diodes; Orthogonal frequency division multiplexing; 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, Modulation
Department/Centre:	Division of Electrical Sciences > Electrical Communication Engineering
Date Deposited:	21 May 2024 03:57
Last Modified:	21 May 2024 03:57
URI:	https://eprints.iisc.ac.in/id/eprint/84575

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