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

By M. Kollengode Ramachandran, Ananthanarayanan Chockalingam. Global Communications Conference, 2018

306 citations recorded by the source corpus.

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.

Subfields: Aerospace Engineering, Electrical and Electronic Engineering

View Paper: https://www.semanticscholar.org/paper/c43e0bf956c3989c20586273abaa930c0164f1c9

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Citations in the corpus

Off-grid Channel Estimation with Sparse Bayesian Learning for OTFS Systems (2021, methodology): “Then, its extension to multiple-input multipleoutput OTFS (MIMO-OTFS) systems was investigated in [7] via positioning the pilot impulses for different transmit antennas with sufficient guard spacing in the DD domain.”
Embedded Pilot-Aided Channel Estimation for OTFS in Delay–Doppler Channels (2018, methodology): “In [12], an entire OTFS frame was used for pilot transmission and the estimated channel information was used for data detection in next frame.”