Diversity and PAPR Enhancement in OTFS using Indexing

Francis, JK and Mary Augustine, R and Chockalingam, A (2021) Diversity and PAPR Enhancement in OTFS using Indexing. In: 93rd IEEE Vehicular Technology Conference, VTC 2021-Spring, 25-28 Apr 2021.

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Abstract

In this paper, we investigate indexing of delay-Doppler (DD) bins in orthogonal time frequency space (OTFS) modulation and propose indexing designs that enhance the diversity order of OTFS. It has been shown in the literature that the asymptotic diversity order of conventional OTFS (without indexing) is just one. In this paper, we show that indexing in the DD domain in OTFS can be used to enhance the asymptotic diversity order to two. Towards this, we consider 2-dimension indexing in OTFS, where indexing is done along both delay as well as Doppler axes. We achieve the enhanced diversity order of two by proposing indexing designs that provably eliminate all the rank one difference matrices. Our simulation results also validate this analytically proven diversity order of two in indexed OTFS. In addition, indexing is shown to offer improved PAPR (peak-to-average power ratio) performance of OTFS. © 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:	Mobile radio systems, Asymptotic diversity order; Diversity order; Doppler; PAPR (peak-to-average power ratio); Time-frequency space, Indexing (of information)
Department/Centre:	Division of Electrical Sciences > Electrical Communication Engineering
Date Deposited:	20 Nov 2021 12:40
Last Modified:	20 Nov 2021 12:40
URI:	http://eprints.iisc.ac.in/id/eprint/69909

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