Orthogonal Frequency Division Multiplexing (OFDM) has been the waveform of choice for most wireless communications systems in the past 25 years. This book addresses the "what comes next?" question by presenting the recently proposed waveform known as Orthogonal Time-Frequency-Space (OTFS), which offers a better alternative for high-mobility environments. The OTFS waveform is based on the idea that the mobile wireless channels can be effectively modelled in the delay-Doppler domain. This domain provides a sparse representation closely resembling the physical geometry of the wireless channel. The key physical parameters such as relative velocity and distance of the reflectors with respect to the receiver can be considered roughly invariant in the duration of a frame up to a few milliseconds. This enables the information symbols encoded in the delay-Doppler domain to experience a flat fading channel even when they are affected by multiple Doppler shifts present in high-mobility environments. Delay-Doppler Communications: Principles and Applications covers the fundamental concepts and the underlying principles of delay-Doppler communications. Readers familiar with OFDM will be able to quickly understand the key differences in delay-Doppler domain waveforms that can overcome some of the challenges of high-mobility communications. For the broader readership with a basic knowledge of wireless communications principles, the book provides sufficient background to be self-contained. The book provides a general overview of future research directions and discusses a range of applications of delay-Doppler domain signal processing. With this book, the reader will be able to: <ul> <li>Recognize the challenges of high-mobility channels affected by both multipath and multiple Doppler shifts in physical layer waveform design and performance;</li> <li>Understand the limitations of current multicarrier techniques such as OFDM in high-mobility channels;</li> <li>Recognize the mathematical and physical relations between the different domains for representing channels and waveforms: time-frequency, time-delay, delay-Doppler;</li> <li>Understand the operation of the key blocks of a delay-Doppler modulator and demodulator&nbsp;both analytically and by hands-on MATLAB examples;</li> <li>Master the special features and advantages of OTFS with regard to detection, channel estimation, MIMO, and multiuser MIMO;</li> <li>Realize the importance&nbsp;of delay-Doppler communications for current and future applications, e.g., 6G and beyond.</li> </ul>

Delay-Doppler Communications: Principles and Applications

Computers & Technology

Hong, Yi

Thaj, Tharaj

Viterbo, Emanuele

Networking & Cloud Computing

Academic Press

This book presents the latest experimental and numerical analysis work in the field of ground deformation and base instability of deep excavations in soft clay subjected to hydraulic uplift. The authors’ latest research findings, based on dimensional analyses, well-instrumented full-scale field tests, systematic coupled-consolidation finite element analyses and centrifuge tests are reported. This book shows how to systematically approach a complex geotechnical problem, from identifying existing problems, reviewing literature, to dimensional and numerical analyses, validation through full-scale testing and centrifuge model testing. The methodologies are also introduced as major tools adopted in geotechnical research.

Deformation and Failure Mechanism of Excavation in Clay Subjected to Hydraulic Uplift (Advanced Topics in Science and Technology in China)

Science & Math

Wang, Lizhong

Earth Sciences

Springer

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