Delay Doppler Communications
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Delay Doppler Communications
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Author : Yi Hong
language : en
Publisher: Academic Press
Release Date : 2022-02-11
Delay Doppler Communications written by Yi Hong and has been published by Academic Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2022-02-11 with Technology & Engineering categories.
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. This is the first book on delay-Doppler communications It is written by three of the leading authorities in the field It includes a wide range of applications With this book, the reader will be able to: Recognize the challenges of high-mobility channels affected by both multipath and multiple Doppler shifts in physical layer waveform design and performance Understand the limitations of current multicarrier techniques such as OFDM in high-mobility channels Recognize the mathematical and physical relations between the different domains for representing channels and waveforms: time-frequency, time-delay, delay-Doppler Understand the operation of the key blocks of a delay-Doppler modulator and demodulator both analytically and by hands-on MATLAB examples Master the special features and advantages of OTFS with regard to detection, channel estimation, MIMO, and multiuser MIMO Realize the importance of delay-Doppler communications for current and future applications, e.g., 6G and beyond
Orthogonal Time Frequency Space Modulation
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Author : Suvra Sekhar Das
language : en
Publisher: CRC Press
Release Date : 2022-09-01
Orthogonal Time Frequency Space Modulation written by Suvra Sekhar Das and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2022-09-01 with Technology & Engineering categories.
Over the last few decades wireless communications, especially Mobile Communication Technology, has evolved by leaps and bounds. The mobile communication industry has named the different major changes as generations namely 1G, 2G,..5G. We are presently looking at deployment of 5G technologies. The work for 6G has already started. This book is focused on the waveform design of 6G. It presents a discourse on a potential waveform for 6G namely Orthogonal Time Frequency Space (OTFS) modulation. OTFS has a distinct feature when compared to earlier generation waveforms such that information bearing signal is placed in the delay Doppler domain as opposed to the usual placement of such signals in the time-frequency domain. This unique feature of OTFS enables it to overcome several disadvantages of a very popular and highly successful waveform namely Orthogonal Frequency Division Multiplexing (OFDM). OTFS is known to be more resilient to frequency offset and Doppler which is one of the key drawbacks of OFDM. With this feature, OTFS, can support higher mobility as well as higher frequency bands of operation which is also one of the key requirements of the next generation wireless communication technologies. The implementation complexity of OTFS remains comparable to that of OFDM. It is found that OTFS provides significant SNR advantage, higher resilience, lower PAPR, lower out of band signal leakage and higher multi-user spectral efficiency than that of OFDM. This book addresses• Fundamental signal model of OTFS. • Receiver design for OTFS• Channel estimation in OTFS• Multiple Access through non-orthogonal multiple access (NOMA-OTFS) The contents of the books are primarily outcome of the research work done at the G. S. Sanyal School of Telecommunications, Indian Institute of Technology Kharagpur, Kharagpur, India. Orthogonal Time Frequency Space Modulation : A waveform for 6G is ideal for personnel the wireless communication industry as well as academic staff and master/research students in electrical engineering with a specialization in wireless communications.
Wireless Communications Over Rapidly Time Varying Channels
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Author : Franz Hlawatsch
language : en
Publisher: Academic Press
Release Date : 2011-05-04
Wireless Communications Over Rapidly Time Varying Channels written by Franz Hlawatsch and has been published by Academic Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011-05-04 with Technology & Engineering categories.
As a result of higher frequencies and increased user mobility, researchers and systems designers are shifting their focus from time-invariant models to channels that vary within a block. Wireless Communications Over Rapidly Time-Varying Channels explains the latest theoretical advances and practical methods to give an understanding of rapidly time varying channels, together with performance trade-offs and potential performance gains, providing the expertise to develop future wireless systems technology. As well as an overview of the issues of developing wireless systems using time-varying channels, the book gives extensive coverage to methods for estimating and equalizing rapidly time-varying channels, including a discussion of training data optimization, as well as providing models and transceiver methods for time-varying ultra-wideband channels. An introduction to time-varying channel models gives in a nutshell the important issues of developing wireless systems technology using time-varying channels Extensive coverage of methods for estimating and equalizing rapidly time-varying channels, including a discussion of training data optimization, enables development of high performance wireless systems Chapters on transceiver design for OFDM and receiver algorithms for MIMO communication channels over time-varying channels, with an emphasis on modern iterative turbo-style architectures, demonstrates how these important technologies can optimize future wireless systems
Scattering In Non Stationary Mobile To Mobile Communications Channels
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Author : Michael Walter
language : en
Publisher: Herbert Utz Verlag
Release Date : 2016-03-24
Scattering In Non Stationary Mobile To Mobile Communications Channels written by Michael Walter and has been published by Herbert Utz Verlag this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016-03-24 with categories.
The aim of this thesis is to introduce a non-stationary model for the scattering in mobile-to-mobile channels. Due to the evolution of wireless technology, fixed-to-mobile communications systems are nowadays complemented by mobile-to-mobile communications systems. In the vehicular sector, mobile-to-mobile communications systems are used to enable intelligent transportation systems. Such systems aim to make transportation safer and more efficient by distributing sensor information among the cars. In the aeronautical sector, mobile-to-mobile communications systems will be used, for example, to exchange position, altitude, speed, and heading data between aircraft during flight thus allowing for a reduced separation between them. Hence, these systems are necessary to further increase the air traffic density.
Almost Linear Complexity Methods For Delay Doppler Channel Estimation
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Author : Alexander Fish
language : en
Publisher:
Release Date : 2014
Almost Linear Complexity Methods For Delay Doppler Channel Estimation written by Alexander Fish and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2014 with categories.
Delay Doppler Estimation In A Multipath Environment
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Author : Amir W. Habboosh
language : en
Publisher:
Release Date : 1997
Delay Doppler Estimation In A Multipath Environment written by Amir W. Habboosh and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1997 with Doppler effect categories.
Delay Doppler Ambiguity Function For Wide Band Signals
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Author : August W. Rihaczek
language : en
Publisher:
Release Date : 1967
Delay Doppler Ambiguity Function For Wide Band Signals written by August W. Rihaczek and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1967 with categories.
The conventional ambiguity function is extended to include the Doppler distortions of the modulation function. The distinctive features of the extension are the use of the complex notation for wide-band signals, and inclusion of the Doppler effect on the signal amplitude. The result is an ambiguity function from which Woodward's form can be found by inspection. It is shown that the well-known volume constraint also applies, in unchanged form, to the generalized ambiguity function. For the volume to be constant, it is not required that the distortions of the modulation function be neglected. Rather, the volume constancy is related to the sinusoidal fluctuations of a modulated-carrier type signal and thus is strictly a matter of the percentage bandwidth of the signal. (Author).
Robust Signal Processing For Wireless Communications
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Author : Frank Dietrich
language : en
Publisher: Springer Science & Business Media
Release Date : 2007-10-25
Robust Signal Processing For Wireless Communications written by Frank Dietrich and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2007-10-25 with Technology & Engineering categories.
Optimization of adaptive signal processing algorithms for wireless communications is based on a model of the underlying propagation channel. In practice, this model is never known perfectly. For example, its parameters have to be estimated and are only known with significant errors. In this book, a systematic treatment of this practical design problem is provided.
On Delay Doppler And Clock Instabilities Compensation Techinques In Synchronization Networks
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Author : James June-Ming Wang
language : en
Publisher:
Release Date : 1986
On Delay Doppler And Clock Instabilities Compensation Techinques In Synchronization Networks written by James June-Ming Wang and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1986 with categories.
Efficiently Estimating A Sparse Delay Doppler Channel
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Author : Alisha Zachariah
language : en
Publisher:
Release Date : 2020
Efficiently Estimating A Sparse Delay Doppler Channel written by Alisha Zachariah and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2020 with categories.
Multiple wireless sensing tasks, e.g., radar detection for driver safety, involve estimating the "channel" or relationship between signal transmitted and received. In this paper, we focus on a certain channel model known as the delay-doppler channel. This model begins to be useful in the high frequency carrier setting, which is increasingly common with developments in millimeter-wave technology. Moreover, the delay-doppler model then continues to be applicable even when using signals of large bandwidth, which is a standard approach to achieving high resolution channel estimation. However, when high resolution is desirable, the standard approach results in a tension with the desire for efficiency because, in particular, it immediately implies that the signals in play live in a space of very high dimension N (e.g., ~10^6 in some applications), as per the Shannon-Nyquist sampling theorem. To address this difficulty, in this paper we propose a novel randomized estimation scheme called Sparse Channel Estimation, or SCE for short, for channel estimation in the k-sparse setting (e.g., k objects in radar detection). This scheme involves an estimation procedure with sampling and space complexity both on the order of k(log N)^3, and arithmetic complexity on the order of k(log N)^3+k^2, for N sufficiently large. To the best of our knowledge, Sparse Channel Estimation (SCE) is the first of its kind to achieve these complexities simultaneously -- it seems to be extremely efficient! As an added advantage, it is a simple combination of three ingredients, two of which are well-known and widely used, namely digital chirp signals and discrete Gaussian filter functions, and the third being recent developments in sparse fast fourier transform algorithms. We note that the design of Sparse Channel Estimation(SCE) is based on a digital channel model which presumes the so-called "on-the-grid" assumption. This assumption is made in a heuristic manner -- while SCE can still be used in the off-the-grid setting, proving guarantees in this more general setting remains to be future work.