OTFS Modulation in Dual-LED Indoor Visible Light Communication Systems

Sinha, S and Chockalingam, A (2021) OTFS Modulation in Dual-LED Indoor Visible Light Communication Systems. In: 94th IEEE Vehicular Technology Conference, 27-30 Sep 2021, Virtual, Online.

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Abstract

In this paper, we investigate the use of a new modulation scheme recently introduced in the RF domain, called orthogonal time frequency space (OTFS) modulation, in an indoor visible light communication (VLC) setting. In particular, we consider VLC systems that employ dual-LED schemes for transmission. The following dual-LED schemes are considered: 1) non-DC biased (NDC) scheme, and 2) dual-LED complex modulation (DCM) scheme. The proposed NDC-OTFS scheme uses 2-dimension (2D) Hermitian symmetry operation to convert complex signals to positive, real-valued signals suitable for transmission in the optical domain, and the proposed DCM-OTFS scheme achieves this by exploiting the polar representation of complex signals. We obtain analytical upper bounds on the bit error performance of the proposed NDC-OTFS and DCM-OTFS schemes, which are found to be tight at high signal-to-noise ratios (SNR). Our analytical and simulation results show that the proposed NDC-OTFS and DCM-OTFS schemes achieve better performance, respectively, compared to NDC-OFDM and DCM-OFDM schemes known in the VLC literature. Further, using the ratio of the minimum distance of different normalized received signal sets as a metric, we quantify the spatial distribution of the SNR gain of the proposed NDC-OTFS/DCM-OTFS schemes compared to NDC-OFDM/DCM-OFDM schemes. © 2021 IEEE.

Item Type:	Conference Paper
Publication:	IEEE Vehicular Technology Conference
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:	Light; Light emitting diodes; Light transmission; Modulation; Orthogonal frequency division multiplexing; Signal to noise ratio, Complex modulation; DC biased; Dual LEDs; Dual-LED complex modulation-orthogonal time frequency space; Dual-LED scheme; Non-DC biased-orthogonal time frequency space; Orthogonal time frequency space modulation; Time-frequency space, Visible light communication
Department/Centre:	Division of Electrical Sciences > Electrical Communication Engineering
Date Deposited:	01 Feb 2022 12:36
Last Modified:	01 Feb 2022 12:36
URI:	http://eprints.iisc.ac.in/id/eprint/71202

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