Input-Output Relation and Performance of RIS-Aided OTFS With Fractional Delay-Doppler

This letter presents an early investigation of reconfigurable intelligent surfaces (RIS)-aided orthogonal time-frequency space (OTFS) in high-Doppler channels. We derive the end-to-end delay-Doppler (DD) domain input-output relation of a RIS-aided OTFS system, considering rectangular pulses and frac...

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Bibliographic Details
Published in:IEEE communications letters 2023-01, Vol.27 (1), p.337-341
Main Authors: Bhat, Vighnesh S., Harshavardhan, Gandhodi, Chockalingam, A.
Format: Article
Language:English
Subjects:
Delay
delay-Doppler domain
Delays
Doppler effect
end-to-end input-output relation
Modulation
OFDM
Receivers
RIS-aided OFDM
RIS-aided OTFS
Transforms
Transmitters
Zak receiver
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Summary:This letter presents an early investigation of reconfigurable intelligent surfaces (RIS)-aided orthogonal time-frequency space (OTFS) in high-Doppler channels. We derive the end-to-end delay-Doppler (DD) domain input-output relation of a RIS-aided OTFS system, considering rectangular pulses and fractional delay-Doppler values. We also consider a Zak receiver for RIS-aided OTFS that converts the received time-domain signal to DD domain in one step using Zak transform, and derive its end-to-end input-output relation. Our simulation results show that i ) RIS-aided OTFS performs better than OTFS without RIS, ii ) Zak receiver performs better than a two-step receiver, and iii ) RIS-aided OTFS achieves superior performance compared to RIS-aided OFDM.
ISSN:1089-7798
1558-2558
DOI:10.1109/LCOMM.2022.3214678