Embedded delay-doppler channel estimation for orthogonal time frequency space modulation

P. Raviteja, Khoa T. Phan, Yi Hong, Emanuele Viterbo

Research output: Chapter in Book/Report/Conference proceedingConference PaperResearch

9 Citations (Scopus)

Abstract

Orthogonal time frequency space (OTFS) modulation was shown to provide significant error performance advantages over orthogonal frequency division multiplexing (OFDM) over delay-Doppler channels. The channel impulse response is needed at the receiver to perform OTFS detection. In this work, we analyze OTFS-based channel estimation using a pilot symbol embedded in the data frame: the pilot symbol with a number of guard zero-symbols is suitably located on the delay-Doppler grid containing the information symbols. Different symbol arrangements are proposed depending on whether the channel has integer or fractional Doppler paths relative to an integer grid. The channel information is first estimated from a group of received symbols using a simple threshold method. The estimated information is then used for data detection within the same frame, via a message passing (MP) algorithm. Numerical results compare the error performance of the proposed schemes and the OTFS scheme with ideal channel estimation under similar spectral and energy efficiency. Moreover, our results show that OTFS with non-ideal channel estimation can still outperform OFDM with ideal channel estimation.

Original languageEnglish
Title of host publication2018 IEEE 88th Vehicular Technology Conference (VTC-Fall) - Proceedings
EditorsOliver Holland
Place of PublicationPiscataway NJ USA
PublisherIEEE, Institute of Electrical and Electronics Engineers
Pages1897-1901
Number of pages5
ISBN (Electronic)9781538663585, 9781538663578
ISBN (Print)9781538663592
DOIs
Publication statusPublished - 12 Apr 2019
EventIEEE Vehicular Technology Conference 2018 (Fall) - Chicago, United States of America
Duration: 27 Aug 201830 Aug 2018
Conference number: 88th
https://ieeexplore.ieee.org/xpl/conhome/8672788/proceeding (Proceedings)

Publication series

NameIEEE Vehicular Technology Conference
PublisherIEEE, Institute of Electrical and Electronics Engineers
ISSN (Print)1550-2252

Conference

ConferenceIEEE Vehicular Technology Conference 2018 (Fall)
Abbreviated titleVTC Fall 2018
Country/TerritoryUnited States of America
CityChicago
Period27/08/1830/08/18
Internet address

Keywords

  • Channel estimation
  • delay-Doppler channel
  • OTFS
  • time-frequency modulation

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