Orthogonal Time Frequency Space Modulation
arXiv:1808.00519
Abstract
This paper introduces a new two-dimensional modulation technique called Orthogonal Time Frequency Space (OTFS) modulation. OTFS has the novel and important feature of being designed in the delay-Doppler domain. When coupled with a suitable equalizer, OTFS modulation is able to exploit the full channel diversity over both time and frequency. Moreover, it converts the fading, time-varying wireless channel experienced by modulated signals such as OFDM into a time-independent channel with a complex channel gain that is essentially constant for all symbols. This design obviates the need for transmitter adaptation, and greatly simplifies system operation. The paper describes the basic operating principles of OTFS as well as a possible implementation as an overlay to current or anticipated standardized systems. OTFS is shown to provide significant performance improvement in systems with high Doppler, short packets, and/or large antenna array. In particular, simulation results indicate at least several dB of block error rate performance improvement for OTFS over OFDM in all of these settings.
arXiv comment13 pages, 9 figures
References in corpus (5)
- A Simple Two-stage Equalizer With Simplified Orthogonal Time Frequency Space Modulation Over Rapidly Time-varying Channels
- OTFS - Orthogonal Time Frequency Space
- Low-Complexity Equalization for Orthogonal Time and Frequency Signaling (OTFS)
- Low-Complexity Iterative Detection for Orthogonal Time Frequency Space Modulation
- On OTFS Modulation for High-Doppler Fading Channels
Cited by in corpus (8)
- Channel Estimation for Orthogonal Time Frequency Space (OTFS) Massive MIMO
- Low Complexity Iterative Rake Decision Feedback Equalizer for Zero-Padded OTFS systems
- Multiple Access in the Delay-Doppler Domain using OTFS modulation
- Low-Complexity Linear Equalization for OTFS Systems with Rectangular Waveforms
- Orthogonal Time Frequency Space (OTFS) Modulation Based Radar System
- Uplink-aided High Mobility Downlink Channel Estimation over Massive MIMO-OTFS System
- Embedded Pilot-Aided Channel Estimation for OTFS in Delay-Doppler Channels
- A DNN-based OTFS Transceiver with Delay-Doppler Channel Training and IQI Compensation