OTFS: A New Generation of Modulation Addressing the Challenges of 5G

By Ronny Hadani, Anton M. Monk. arXiv.org, 2018

327 citations recorded by the source corpus.

In this paper, we introduce a new 2D modulation scheme referred to as OTFS (Orthogonal Time Frequency & Space) that multiplexes information QAM symbols over new class of carrier waveforms that correspond to localized pulses in a signal representation called the delay-Doppler representation. OTFS constitutes a far reaching generalization of conventional time and frequency modulations such as TDM and FDM and, from a broader perspective, it establishes a conceptual link between Radar and communication. The OTFS waveforms couple with the wireless channel in a way that directly captures the underlying physics, yielding a high-resolution delay-Doppler Radar image of the constituent reflectors. As a result, the time-frequency selective channel is converted into an invariant, separable and orthogonal interaction, where all received QAM symbols experience the same localized impairment and all the delay-Doppler diversity branches are coherently combined. The high resolution delay-Doppler separation of the reflectors enables OTFS to approach channel capacity with optimal performance-complexity tradeoff through linear scaling of spectral efficiency with the MIMO order and robustness to Doppler and multipath channel conditions. OTFS is an enabler for realizing the full promise of MUMIMO gains even in challenging 5G deployment settings where adaptation is unrealistic.

Subfields: Electrical and Electronic Engineering

View Paper: https://www.semanticscholar.org/paper/5e72e33df5fad7fb6fb0a771b681e1bbfa7351dc

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In Electrical and Electronic Engineering

Citations in the corpus

Evolution of NOMA Toward Next Generation Multiple Access (NGMA) for 6G (2021, background): “Recently, a new approach, termed orthogonal time frequency space (OTFS) modulation, has been proposed to support highmobility users [119]–[121].”
Embedded Pilot-Aided Channel Estimation for OTFS in Delay–Doppler Channels (2018, methodology): “In general, OTFS uses the delay-Doppler channel response [1]–[3] to parameterize the effects of a time-varying channel on any transmitted waveform.”
Orthogonal Time-Frequency Space Modulation: A Promising Next-Generation Waveform (2021, background): “In contrast to existing tutorial papers on OTFS [2], [3], this article portrays OTFS modulation conceived for communications over high-mobility environments by providing an easy-reading overview of its fundamental concepts, highlighting the challenges and potential solutions as well as exploring…”
Channel Estimation for Orthogonal Time Frequency Space (OTFS) Massive MIMO (2019, unknown): “For example, the zero-forcing Tomlinson-Harashima precoding is adopted in [12].”
Interference Cancellation and Iterative Detection for Orthogonal Time Frequency Space Modulation (2018, methodology): “A new time–frequency modulation technique called orthogonal time frequency space (OTFS) was recently proposed in [5] and [6], which shows significant advantages over OFDM in delay–Doppler channels.”
Practical Pulse-Shaping Waveforms for Reduced-Cyclic-Prefix OTFS (2019, background): “Orthogonal time frequency space (OTFS) modulation has been recently proposed in [1], [3] to efﬁciently address the high Doppler sensitivity problem occurring in orthogonal frequency division multiplexing (OFDM) modulation.”