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MIMO-OTFS in High-Doppler Fading Channels: Signal Detection and Channel Estimation

Ramachandran, M Kollengode and Chockalingam, A (2019) MIMO-OTFS in High-Doppler Fading Channels: Signal Detection and Channel Estimation. In: 2018 IEEE Global Communications Conference, GLOBECOM 2018 - Proceedings 2018, 9-13 December, 2018, Abu Dhabi National Exhibition Centre (ADNEC)Abu Dhabi; United Arab Emirates;.

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Official URL: https://dx.doi.org/10.1109/GLOCOM.2018.8647394


Orthogonal time frequency space (OTFS) modulation is a recently introduced multiplexing technique designed in the 2-dimensional (2D) delay-Doppler domain suited for high-Doppler fading channels. OTFS converts a doubly-dispersive channel into an almost non-fading channel in the delay-Doppler domain through a series of 2D transformations. In this paper, we focus on MIMO-OTFS which brings in the high spectral and energy efficiency benefits of MIMO and the robustness of OTFS in high-Doppler fading channels. The OTFS channel-symbol coupling and the sparse delay-Doppler channel impulse response enable efficient MIMO channel estimation in high Doppler environments. We present an iterative algorithm for signal detection based on message passing and a channel estimation scheme in the delay-Doppler domain suited for MIMO-OTFS. The proposed channel estimation scheme uses impulses in the delay-Doppler domain as pilots for estimation. We also compare the performance of MIMO-OTFS with that of MIMO-OFDM under high Doppler scenarios.

Item Type: Conference Proceedings
Series.: IEEE Global Communications Conference
Publisher: IEEE
Additional Information: IEEE Global Communications Conference (GLOBECOM), Abu Dhabi, U ARAB EMIRATES, DEC 09-13, 2018
Keywords: OTFS modulation; MIMO-OTFS; 2D modulation; delay-Doppler domain; MIMO-OTFS signal detection; channel estimation
Department/Centre: Division of Electrical Sciences > Electrical Communication Engineering > Electrical Communication Engineering - Technical Reports
Date Deposited: 11 Jul 2019 10:23
Last Modified: 11 Jul 2019 10:23
URI: http://eprints.iisc.ac.in/id/eprint/62900

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