OTFS - Orthogonal Time Frequency Space
arXiv:1608.02993
Abstract
In this paper we introduce 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. OTFS converts the fading, time-varying wireless channel into a non-fading, time-independent interaction revealing the underlying geometry of the wireless channel. In this new formulation, all QAM symbols experience the same channel and all Delay-Doppler diversity branches of the channel are coherently combined. Reference signal multiplexing is done in the time-independent Delay-Doppler domain, achieving high density pilot packing, which is a crucial requirement for Massive MIMO. Regardless of the Doppler scenario, OTFS enables approaching channel capacity through linear scaling of throughput with MIMO order, thus realizing the full promise of Massive MIMO throughput gains even in challenging 5G deployment settings.
Cited by in corpus (14)
- Channel Estimation for Orthogonal Time Frequency Space (OTFS) Massive MIMO
- Non Orthogonal Multiple Access with Orthogonal Time Frequency Space Signal Transmission
- Low-Complexity Equalization for Orthogonal Time and Frequency Signaling (OTFS)
- MIMO-OTFS in High-Doppler Fading Channels: Signal Detection and Channel Estimation
- Low-Complexity Linear Equalizers for OTFS Exploiting Two-Dimensional Fast Fourier Transform
- On OTFS Modulation for High-Doppler Fading Channels
- Orthogonal Time Frequency Space Modulation
- Performance Evaluation of OTFS Over Measured V2V Channels at 60 GHz
- On the Diversity of Uncoded OTFS Modulation in Doubly-Dispersive Channels
- Message Passing Based Structured Sparse Signal Recovery for Estimation of OTFS Channels with Fractional Doppler Shifts
- Low Complexity Channel Estimation for OTFS Modulation with Fractional Delay and Doppler
- Angular-Domain Selective Channel Tracking and Doppler Compensation for High-Mobility mmWave Massive MIMO
- Iterative Detection for Orthogonal Time Frequency Space Modulation with Unitary Approximate Message Passing
- Vehicular Communications: A Physical Layer Perspective