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• W2932915362 abstract "Orthogonal time frequency space (OTFS) is a 2-dimensional (2D) modulation technique designed in the delay-Doppler domain. A key premise behind OTFS is the transformation of a time varying multipath channel into an almost non-fading 2D channel in delay-Doppler domain such that all symbols in a transmission frame experience the same channel gain. It has been suggested in the recent literature that OTFS can extract full diversity in the delay-Doppler domain, where full diversity refers to the number of multipath components separable in either the delay or Doppler dimension, but without a formal analysis. In this paper, we present a formal analysis of the diversity achieved by OTFS modulation along with supporting simulations. Specifically, we prove that the asymptotic diversity order of OTFS (as SNR $rightarrow infty$) is one. However, in the finite SNR regime, potential for a higher order diversity is witnessed before the diversity one regime takes over. Also, the diversity one regime starts at lower BER values for increased frame sizes. We also propose a phase rotation scheme for OTFS using transcendental numbers. We show that OTFS with this proposed scheme extracts the full diversity in the delay-Doppler domain." @default.
• W2932915362 created "2019-04-11" @default.
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• W2932915362 date "2018-08-23" @default.
• W2932915362 modified "2023-10-14" @default.
• W2932915362 title "On the Diversity of Uncoded OTFS Modulation in Doubly-Dispersive Channels" @default.
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• W2932915362 doi "https://doi.org/10.48550/arxiv.1808.07747" @default.
• W2932915362 hasPublicationYear "2018" @default.
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