Concepts de base
OTFS modulation offers performance benefits over conventional OFDM for DD communications.
Résumé
The paper explores the fundamentals of Delay-Doppler (DD) communications, focusing on the practical implementation and extensions to Orthogonal Time Frequency Space (OTFS) modulation. It starts by presenting general DD communications from the Zak transform perspective, highlighting unique signal structures beneficial for communication. Practical implementations of DD Nyquist communications are discussed, emphasizing orthogonality achieved through different windowing techniques. The paper also delves into pulse shaping frameworks and numerical results showcasing advantages over OFDM. The importance of the Zak transform in OTFS is emphasized, with recent developments like OTFS 2.0 highlighted for their simplified input-output relations purely in the DD domain.
Structure:
- Introduction to Next-Gen Wireless Networks
- Advantages of OTFS Modulation
- Historical Recap of OTFS Literature
- Importance of Zak Transform in OTFS Realization
- Fundamentals of Delay-Doppler Domain Signaling
- Constructing Delay-Doppler Domain Basis Functions
- Properties of DD Domain Basis Function and Its Truncation
Stats
"Orthogonal time frequency space (OTFS) modulation has attracted significant attention due to its appealing performance over doubly-selective channels."
"Rectangular windows achieve perfect DD orthogonality in practical implementations."
"Smoothed rectangular windows with excess bandwidth result in slightly worse orthogonality but better pulse localization in the DD domain."
"Numerical results demonstrate advantages of DD communications over conventional orthogonal frequency division multiplexing (OFDM)."