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OTFS: A New Modulation Scheme for High-Mobility Use Cases

Ramachandran, MK and Surabhi, GD and Chockalingam, A (2020) OTFS: A New Modulation Scheme for High-Mobility Use Cases. In: Journal of the Indian Institute of Science, 100 (2). pp. 315-336.

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Official URL: https://dx.doi.org/10.1007/s41745-020-00167-4


Among the several emerging use case families in 5G, high-mobility use case family is a technologically challenging one. It is expected that there will be a growing demand for mobile services in vehicles, high-speed trains, and even aircraft. The degree of mobility support required (i.e., speed) will depend upon the specific use case (e.g., 500 km/h in bullet trains and 1000 km/h in airplanes). Mobility-on-demand, ranging from very high mobility to low or no mobility, need to be supported. The currently used waveforms fail to perform well in high-mobility scenarios where the Doppler shifts witnessed are quite high (e.g., several kHz of Doppler). Orthogonal time�frequency space (OTFS) is a recently proposed radio access technology waveform suited very well for high-mobility environments. It is a two-dimensional modulation scheme in which information symbols are multiplexed in the delay�Doppler domain. We present an overview of delay�Doppler representation of wireless channels and introduce OTFS modulation along with OTFS basis functions. We illustrate the slow variability and sparse nature of the delay�Doppler channel using an urban multi-lane scenario. Focusing on MIMO-OTFS systems, we present signal detection and channel estimation schemes and their performance. MIMO-OTFS is shown to achieve significantly better performance compared to MIMO-OFDM in high-Doppler environments operating in 4 GHz and 28 GHz frequency bands.

Item Type: Journal Article
Publication: Journal of the Indian Institute of Science
Publisher: Springer
Additional Information: The copyright of this article belongs to Springer
Keywords: Aircraft; MIMO systems; Modulation; Railroad cars; Railroad transportation; Railroads, Degree of mobility; Doppler channels; Frequency spaces; High speed train (HST); Information symbol; Radio access technologies; Two dimensional modulations; Wireless channel, 5G mobile communication systems
Department/Centre: Division of Electrical Sciences > Electrical Communication Engineering
Date Deposited: 12 Aug 2020 07:47
Last Modified: 12 Aug 2020 07:47
URI: http://eprints.iisc.ac.in/id/eprint/65439

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