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Author: Dr. Himanshu B. Soni
Publisher: LAP Lambert Academic Publishing
ISBN: 9783844323863
Category :
Languages : en
Pages : 132
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Book Description
In this book, we have considered multiuser communication scenario with Ultra Wideband (UWB) communication. Different issues under multiuser communication are considered with focus on capacity issue. In literature two widely discussed techniques for multiple access for UWB are based on Time Hopping (TH) and Orthogonal Frequency Division Multiplexing (OFDM). In our investigations we have considered both these techniques for UWB system and addressed different issues. TH based technique has been available for long in literature for UWB communication, while new standard for UWB is based on OFDM. We have considered downlink communication with UWB. Under this scenario we have considered the case wherein UWB device collects the data from different multimedia sources and transmits the combined data over link. We have proposed scheme based on DS-CDMA based OFDM. For this scheme we have proposed two system models named system model-I and system model-II. Model-I is considered without MUI and in Model-II we have considered the effect of MUI. we have evaluated the performance under AWGN channel, multipath Rayleigh channel and SV channel.
Author: Dr. Himanshu B. Soni
Publisher: LAP Lambert Academic Publishing
ISBN: 9783844323863
Category :
Languages : en
Pages : 132
Get Book Here
Book Description
In this book, we have considered multiuser communication scenario with Ultra Wideband (UWB) communication. Different issues under multiuser communication are considered with focus on capacity issue. In literature two widely discussed techniques for multiple access for UWB are based on Time Hopping (TH) and Orthogonal Frequency Division Multiplexing (OFDM). In our investigations we have considered both these techniques for UWB system and addressed different issues. TH based technique has been available for long in literature for UWB communication, while new standard for UWB is based on OFDM. We have considered downlink communication with UWB. Under this scenario we have considered the case wherein UWB device collects the data from different multimedia sources and transmits the combined data over link. We have proposed scheme based on DS-CDMA based OFDM. For this scheme we have proposed two system models named system model-I and system model-II. Model-I is considered without MUI and in Model-II we have considered the effect of MUI. we have evaluated the performance under AWGN channel, multipath Rayleigh channel and SV channel.
Author: Himanshu B. Soni
Publisher: Universal-Publishers
ISBN: 1612330029
Category :
Languages : en
Pages : 1074
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Book Description
The International Conference on Signals, Systems and Automation (ICSSA 2011) aims to spread awareness in the research and academic community regarding cutting-edge technological advancements revolutionizing the world. The main emphasis of this conference is on dissemination of information, experience, and research results on the current topics of interest through in-depth discussions and participation of researchers from all over the world. The objective is to provide a platform to scientists, research scholars, and industrialists for interacting and exchanging ideas in a number of research areas. This will facilitate communication among researchers in different fields of Electronics and Communication Engineering. The International Conference on Intelligent System and Data Processing (ICISD 2011) is organized to address various issues that will foster the creation of intelligent solutions in the future. The primary goal of the conference is to bring together worldwide leading researchers, developers, practitioners, and educators interested in advancing the state of the art in computational intelligence and data processing for exchanging knowledge that encompasses a broad range of disciplines among various distinct communities. Another goal is to promote scientific information interchange between researchers, developers, engineers, students, and practitioners working in India and abroad.
Author: Abdur Rahim
Publisher: Jörg Vogt Verlag
ISBN: 3938860324
Category :
Languages : en
Pages : 190
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Book Description
Author: İsmail Güvenç
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
ABSTRACT: Ultrawideband (UWB) is one of the promising technologies for future short-range high data rate communications (e.g. for wireless personal area networks) and longer range low data rate communications (e.g. wireless sensor networks). Despite its various advantages and potentials (e.g. low-cost circuitry, unlicensed reuse of licensed spectrum, precision ranging capability etc.), UWB also has its own challenges. The goal of this dissertation is to identify and address some of those challenges, and provide a framework for practical UWB transceiver design. In this dissertation, various modulation options for UWB systems are reviewed in terms of their bit error rate (BER) performances, spectral characteristics, modem and hardware complexities, and data rates. Time hopping (TH) code designs for both synchronous (introduced an adaptive code assignment technique) and asynchronous UWB impulse radio (IR) systems are studied. An adaptive assignment of two different multiple access parameters (number of pulses per symbol and number of pulse positions per frame)is investigated again considering both synchronous and asynchronous scenarios, and a mathematical framework is developed using Gaussian approximations of interference statistics for different scenarios. Channel estimation algorithms for multiuser UWB communication systems using symbol-spaced (proposed a technique that decreases the training size), frame-spaced (proposed a pulse-discarding algorithm for enhanced estimationperformance), and chip-spaced (using least squares (LS) estimation) sampling are analyzed. A comprehensive review on multiple accessing andinterference avoidance/cancellation for IR-UWB systems is presented. BER performances of different UWB modulation schemes in the presence of timing jitter are evaluated and compared in static and multipath fading channels, and finger estimation error, effects of jitter distribution, and effects of pulse shape are investigated. A unified performance analysis approach for different IR-UWB transceiver types (stored-reference, transmitted-reference, and energy detector) employing various modulation options and operating at sub-Nyquist sampling rates is presented. The time-of-arrival (TOA) estimation performance of different searchback schemesunder optimal and suboptimal threshold settings are analyzed both for additive white Gaussian noise (AWGN) and multipath channels.
Author: Zafer Sahinoglu
Publisher: Cambridge University Press
ISBN: 1139472313
Category : Technology & Engineering
Languages : en
Pages : 271
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Book Description
Position estimation of wireless devices has many applications in short-range networks. Ultra-wideband (UWB) signals provide accurate positioning capabilities that can be harnessed in wireless systems to realise these applications. This text provides detailed coverage of UWB positioning systems, offering comprehensive treatment of signal and receiver design for ranging, range estimation techniques, theoretical performance bounds, ranging algorithms and protocols. Beginning with a discussion of the potential applications of wireless positioning, and investigating UWB signals for such applications, later chapters establish a signal processing framework for analysing UWB positioning and ranging systems. The recent IEEE 802.15.4a standard related to UWB is also studied in detail. Each chapter contains examples, problems and Matlab scripts to help readers grasp key concepts. This is an ideal text for graduate students and researchers in electrical and computer engineering, and practitioners in the communications industry, particularly those in wireless communications. Further resources are available at www.cambridge.org/9780521873093.
Author: Joe Izu Jamp
Publisher:
ISBN: 9781109926842
Category :
Languages : en
Pages : 149
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Book Description
For UWB OFDM based systems, LABI is again applied to code the data in the vicinity of a notch created by nulling out subcarriers. In-band notches of -28dB can be created, and is an improvement of 20dB over an uncoded spectrum.
Author: Albena Mihovska
Publisher: Artech House
ISBN: 1607839687
Category : Technology & Engineering
Languages : en
Pages : 467
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Book Description
Based on cutting-edge research projects in the field, this book (part of a comprehensive 4-volume series) provides the latest details and covers the most impactful aspects of mobile, wireless, and broadband communications development. These books present key systems and enabling technologies in a clear and accessible manner, offering you a detailed roadmap the future evolution of next generation communications. Other volumes cover Networks, Services and Applications; Reconfigurability; and Ad Hoc Networks.
Author: Savo G. Glisic
Publisher: John Wiley & Sons
ISBN: 9780470512876
Category : Technology & Engineering
Languages : en
Pages : 890
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Book Description
Fully revised and updated version of the successful "AdvancedWireless Communications" Wireless communications continue to attract the attention ofboth research community and industry. Since the first edition waspublished significant research and industry activities have broughtthe fourth generation (4G) of wireless communications systemscloser to implementation and standardization. "Advanced Wireless Communications" continues to provide acomparative study of enabling technologies for 4G. This secondedition has been revised and updated and now includes additionalinformation on the components of common air interface, includingthe area of space time coding , multicarrier modulation especiallyOFDM, MIMO, cognitive radio and cooperative transmission. Ideal for students and engineers in research and development inthe field of wireless communications, the second edition ofAdvanced Wireless Communications also gives an understanding tocurrent approaches for engineers in telecomm operators, governmentand regulatory institutions. New features include: Brand new chapter covering linear precoding in MIMO channelsbased on convex optimization theory. Material based on game theory modelling encompassing problemsof adjacent cell interference, flexible spectra sharing andcooperation between the nodes in ad hoc networks. Presents and discusses the latest schemes for interferencesuppression in ultra wide band (UWB) cognitive systems. Discusses the cooperative transmission and more details onpositioning.
Author: Kuinam J. Kim
Publisher: Springer Science & Business Media
ISBN: 940075860X
Category : Technology & Engineering
Languages : en
Pages : 1179
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Book Description
The proceedings approaches the subject matter with problems in technical convergence and convergences of security technology. This approach is new because we look at new issues that arise from techniques converging. The general scope of the proceedings content is convergence security and the latest information technology. The intended readership are societies, enterprises, and research institutes, and intended content level is mid- to highly educated personals. The most important features and benefits of the proceedings are the introduction of the most recent information technology and its related ideas, applications and problems related to technology convergence, and its case studies and finally an introduction of converging existing security techniques through convergence security. Overall, through the proceedings, authors will be able to understand the most state of the art information strategies and technologies of convergence security.
Author:
Publisher:
ISBN:
Category : Dissertations, Academic
Languages : en
Pages : 902
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Book Description
