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 language | English |
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Title of host publication | 2018 IEEE 88th Vehicular Technology Conference (VTC-Fall) - Proceedings |
Editors | Oliver Holland |
Place of Publication | Piscataway NJ USA |
Publisher | IEEE, Institute of Electrical and Electronics Engineers |
Pages | 1897-1901 |
Number of pages | 5 |
ISBN (Electronic) | 9781538663585, 9781538663578 |
ISBN (Print) | 9781538663592 |
DOIs | |
Publication status | Published - 12 Apr 2019 |
Event | IEEE Vehicular Technology Conference 2018 (Fall) - Chicago, United States of America Duration: 27 Aug 2018 → 30 Aug 2018 Conference number: 88th https://ieeexplore.ieee.org/xpl/conhome/8672788/proceeding (Proceedings) |
Publication series
Name | IEEE Vehicular Technology Conference |
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Publisher | IEEE, Institute of Electrical and Electronics Engineers |
ISSN (Print) | 1550-2252 |
Conference
Conference | IEEE Vehicular Technology Conference 2018 (Fall) |
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Abbreviated title | VTC Fall 2018 |
Country/Territory | United States of America |
City | Chicago |
Period | 27/08/18 → 30/08/18 |
Internet address |
Keywords
- Channel estimation
- delay-Doppler channel
- OTFS
- time-frequency modulation