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Orthogonal Delay Scale Space Modulation: A New Technique for Wideband Time-Varying Channels

Arunkumar, KP and Murthy, CR (2022) Orthogonal Delay Scale Space Modulation: A New Technique for Wideband Time-Varying Channels. In: IEEE Transactions on Signal Processing, 70 . pp. 2625-2638.

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Official URL: https://doi.org/10.1109/TSP.2022.3174415


Orthogonal Time Frequency Space (OTFS) modulation is a recently proposed scheme for time-varying narrowband channels in terrestrial radio-frequency communications. Underwater acoustic (UWA) and ultra-wideband (UWB) communication systems, on the other hand, confront wideband time-varying channels. Unlike narrowband channels, for which time contractions or dilations due to Doppler effect can be approximated by frequency-shifts, the Doppler effect in wideband channels results in frequency-dependent non-uniform shift of signal frequencies across the band. In this paper, we develop an OTFS-like modulation scheme - Orthogonal Delay Scale Space (ODSS) modulation - for handling wideband time-varying channels. We derive the ODSS transmission and reception schemes from first principles. In the process, we introduce the notion of ω-convolution in the delay-scale space that parallels the twisted convolution used in the time-frequency space. The preprocessing 2D transformation from the Fourier-Mellin domain to the delay-scale space in ODSS, which plays the role of inverse symplectic Fourier transform (ISFFT) in OTFS, improves the bit error rate performance compared to OTFS and Orthogonal Frequency Division Multiplexing (OFDM) in wideband time-varying channels. Furthermore, since the channel matrix is rendered near-diagonal, ODSS retains the advantage of OFDM in terms of its low-complexity receiver structure.

Item Type: Journal Article
Publication: IEEE Transactions on Signal Processing
Publisher: Institute of Electrical and Electronics Engineers Inc.
Additional Information: The copyright for this article belongs to the Authors.
Keywords: Bit error rate; Convolution; Inverse problems; Modulation; Orthogonal frequency division multiplexing; Time varying networks; Ultra-wideband (UWB); Underwater acoustic communication, Delay; Narrow bands; Narrowband channels; Orthogonal frequency-division multiplexing; Receiver; Scale spaces; Time varying channel; Time-frequency Analysis; Time-frequency space; Wide-band, Doppler effect
Department/Centre: Division of Electrical Sciences > Electrical Communication Engineering
Date Deposited: 02 Jul 2022 06:20
Last Modified: 02 Jul 2022 06:20
URI: https://eprints.iisc.ac.in/id/eprint/74139

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