Orthogonal Time Frequency Space Modulation

@article{Hadani2017OrthogonalTF,
  title={Orthogonal Time Frequency Space Modulation},
  author={Ronny Hadani and Shlomo Rakib and Michail K. Tsatsanis and Anton M. Monk and Andrea J. Goldsmith and Andreas F. Molisch and A. Robert Calderbank},
  journal={2017 IEEE Wireless Communications and Networking Conference (WCNC)},
  year={2017},
  pages={1-6}
}
  • R. Hadani, S. Rakib, A. Calderbank
  • Published 19 March 2017
  • Computer Science
  • 2017 IEEE Wireless Communications and Networking Conference (WCNC)
A new two-dimensional modulation technique called Orthogonal Time Frequency Space (OTFS) modulation designed in the delay-Doppler domain is introduced. [] Key Method This extraction of the full channel diversity allows OTFS to greatly simplify system operation and significantly improves performance, particular in systems with high Doppler, short packets, and large antenna arrays. Simulation results indicate at least several dB of block error rate performance improvement for OTFS over OFDM in all of these…

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Analysis of Discrete-Time MIMO OFDM-Based Orthogonal Time Frequency Space Modulation

TLDR
This analysis reveals that the proposed MIMO OTFS and OFDM systems have the same ergodic capacity despite the well-known fact that the former has great advantages in low-complexity receiver design for high Doppler channels.

Low Complexity Modem Structure for OFDM-Based Orthogonal Time Frequency Space Modulation

TLDR
This letter argues against deployment of window functions at the OTFS transmitter in realistic scenarios and thus limit any sort of windowing to the receiver side, and derivations lead to simplified modulator and demodulator structures that are far simpler than those in the literature.

Low-complexity iterative detection for orthogonal time frequency space modulation

TLDR
A low-complexity message passing (MP) detection algorithm is proposed, suitable for large-scale OTFS taking advantage of the inherent channel sparsity, and adapted to compensate for the effect of IDI in order to further improve performance.

Comparison of OTFS Diversity Performance over Slow and Fast Fading Channels

TLDR
This paper derives the input and output relationship of OTFS signal in the delay-time domain, which shows that OTFs can be regarded as a combination of OFDM and single-carrier frequency-division multiple access (SC-FDMA).

A Simple Two-stage Equalizer With Simplified Orthogonal Time Frequency Space Modulation Over Rapidly Time-varying Channels

TLDR
The simulation results demonstrate that the proposed method is superior to the conventional single- tap equalizer and full minimum mean squared error (MMSE) equalizer of OFDM systems in terms of BER in high Doppler spread scenarios.

Embedded Delay-Doppler Channel Estimation for Orthogonal Time Frequency Space Modulation

TLDR
This work analyzes 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.

On OTFS Modulation for High-Doppler Fading Channels

TLDR
This paper investigates OTFS from a signal detection and channel estimation perspective, and proposes a Markov chain Monte-Carlo sampling based detection scheme and a pseudo-random noise (PN) pilot based channel estimation scheme in the delay-Doppler domain.

On the Diversity of OTFS Modulation in Doubly-Dispersive Channels

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It is proved that the asymptotic diversity order of OTFS (as SNR $\rightarrow \infty$) is one, however, in the finite SNR regime, potential for a higher order diversity is witnessed before the diversity one regime takes over.
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TLDR
A new 2D modulation technique called OTFS (Orthogonal Time Frequency & Space) that transforms information carried in the Delay-Doppler coordinate system to the familiar time-frequency domain utilized by traditional modulation schemes such as OFDM, CDMA and TDMA, thus realizing the full promise of Massive MIMO throughput gains even in challenging 5G deployment settings.

Analysis of Discrete-Time MIMO OFDM-Based Orthogonal Time Frequency Space Modulation

TLDR
This analysis reveals that the proposed MIMO OTFS and OFDM systems have the same ergodic capacity despite the well-known fact that the former has great advantages in low-complexity receiver design for high Doppler channels.

Low Complexity Modem Structure for OFDM-Based Orthogonal Time Frequency Space Modulation

TLDR
This letter argues against deployment of window functions at the OTFS transmitter in realistic scenarios and thus limit any sort of windowing to the receiver side, and derivations lead to simplified modulator and demodulator structures that are far simpler than those in the literature.

Low-complexity iterative detection for orthogonal time frequency space modulation

TLDR
A low-complexity message passing (MP) detection algorithm is proposed, suitable for large-scale OTFS taking advantage of the inherent channel sparsity, and adapted to compensate for the effect of IDI in order to further improve performance.

A Simple Two-stage Equalizer With Simplified Orthogonal Time Frequency Space Modulation Over Rapidly Time-varying Channels

TLDR
The simulation results demonstrate that the proposed method is superior to the conventional single- tap equalizer and full minimum mean squared error (MMSE) equalizer of OFDM systems in terms of BER in high Doppler spread scenarios.

On OTFS Modulation for High-Doppler Fading Channels

TLDR
This paper investigates OTFS from a signal detection and channel estimation perspective, and proposes a Markov chain Monte-Carlo sampling based detection scheme and a pseudo-random noise (PN) pilot based channel estimation scheme in the delay-Doppler domain.

Low-Complexity Equalization for Orthogonal Time and Frequency Signaling (OTFS)

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