Adaptive RF Front-Ends for Hand-held Applications PDF Download
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Author: Andre van Bezooijen
Publisher: Springer Science & Business Media
ISBN: 9048199352
Category : Technology & Engineering
Languages : en
Pages : 169
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Book Description
The RF front-end – antenna combination is a vital part of a mobile phone because its performance is very relevant to the link quality between hand-set and cellular network base-stations. The RF front-end performance suffers from changes in operating environment, like hand-effects, that are often unpredictable. Adaptive RF Front-Ends for Hand-Held Applications presents an analysis on the impact of fluctuating environmental parameters. In order to overcome undesired behavior two different adaptive control methods are treated that make RF frond-ends more resilient: adaptive impedance control, and adaptive power control. Several adaptive impedance control techniques are discussed, using a priori knowledge on matching network properties, in order to simplify robust 2-dimensional control. A generic protection concept is presented, based on adaptive power control, which improves the ruggedness of a power amplifier or preserves its linearity under extremes. It comprises over-voltage, over-temperature, and under-voltage protection.
Author: Andre van Bezooijen
Publisher: Springer Science & Business Media
ISBN: 9048199352
Category : Technology & Engineering
Languages : en
Pages : 169
Get Book Here
Book Description
The RF front-end – antenna combination is a vital part of a mobile phone because its performance is very relevant to the link quality between hand-set and cellular network base-stations. The RF front-end performance suffers from changes in operating environment, like hand-effects, that are often unpredictable. Adaptive RF Front-Ends for Hand-Held Applications presents an analysis on the impact of fluctuating environmental parameters. In order to overcome undesired behavior two different adaptive control methods are treated that make RF frond-ends more resilient: adaptive impedance control, and adaptive power control. Several adaptive impedance control techniques are discussed, using a priori knowledge on matching network properties, in order to simplify robust 2-dimensional control. A generic protection concept is presented, based on adaptive power control, which improves the ruggedness of a power amplifier or preserves its linearity under extremes. It comprises over-voltage, over-temperature, and under-voltage protection.
Author: Ryan Yoichiro Miyamoto
Publisher:
ISBN:
Category :
Languages : en
Pages : 180
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Book Description
Author: Vojkan Vidojkovic
Publisher: Springer Science & Business Media
ISBN: 1402065345
Category : Technology & Engineering
Languages : en
Pages : 204
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Book Description
This book investigates solutions, benefits, limitations, and costs associated with multi-standard operation of RF front-ends and their ability to adapt to variable radio environments. Next, it highlights the optimization of RF front-ends to allow maximum performance within a certain power budget, while targeting full integration. Finally, the book investigates possibilities for low-voltage, low-power circuit topologies in CMOS technology.
Author: Vojkan Vidojkovic
Publisher: Springer
ISBN: 9789048115327
Category : Technology & Engineering
Languages : en
Pages : 192
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Book Description
This book investigates solutions, benefits, limitations, and costs associated with multi-standard operation of RF front-ends and their ability to adapt to variable radio environments. Next, it highlights the optimization of RF front-ends to allow maximum performance within a certain power budget, while targeting full integration. Finally, the book investigates possibilities for low-voltage, low-power circuit topologies in CMOS technology.
Author: Aleksandar Tasic
Publisher:
ISBN: 9789090193489
Category :
Languages : en
Pages :
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Book Description
Author: Alencar, Paulo
Publisher: IGI Global
ISBN: 1615206566
Category : Computers
Languages : en
Pages : 1040
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Book Description
The popularity of an increasing number of mobile devices, such as PDAs, laptops, smart phones, and tablet computers, has made the mobile device the central method of communication in many societies. These devices may be used as electronic wallets, social networking tools, or may serve as a person’s main access point to the World Wide Web. The Handbook of Research on Mobile Software Engineering: Design, Implementation, and Emergent Applications highlights state-of-the-art research concerning the key issues surrounding current and future challenges associated with the software engineering of mobile systems and related emergent applications. This handbook addresses gaps in the literature within the area of software engineering and the mobile computing world.
Author: Gernot Hueber
Publisher: John Wiley & Sons
ISBN: 0470277114
Category : Technology & Engineering
Languages : en
Pages : 608
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Book Description
Summarizes cutting-edge physical layer technologies for multi-mode wireless RF transceivers. Includes original contributions from distinguished researchers and professionals. Covers cutting-edge physical layer technologies for multi-mode wireless RF transceivers. Contributors are all leading researchers and professionals in this field.
Author: Meghanathan, Natarajan
Publisher: IGI Global
ISBN: 146664222X
Category : Technology & Engineering
Languages : en
Pages : 370
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Book Description
Radio interference is a problem that has plagued air communication since its inception. Advances in cognitive radio science help to mitigate these concerns. Cognitive Radio Technology Applications for Wireless and Mobile Ad Hoc Networks provides an in-depth exploration of cognitive radio and its applications in mobile and/or wireless network settings. The book combines a discussion of existing literature with current and future research to create an integrated approach that is useful both as a textbook for students of computer science and as a reference book for researchers and practitioners engaged in solving the complex problems and future challenges of cognitive radio technologies.
Author: Aleksandar Tasic
Publisher: Springer Science & Business Media
ISBN: 1402052502
Category : Technology & Engineering
Languages : en
Pages : 232
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Book Description
With a billion – soon to be two billion - cellular telephones in circulation, the next challenge is to make cellular radio functions adaptive to their environment. This book provides a comprehensive theoretical framework for optimizing performance, discussing joint optimization of Noise Figure and Input Intercept Point in receiver systems. Also examined are original techniques to optimize voltage controlled oscillators and low-noise amplifiers, minimizing power consumption while maintaining adequate system performance.
Author: David B. Cruickshank
Publisher: Artech House
ISBN: 1630816965
Category : Technology & Engineering
Languages : en
Pages : 316
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Book Description
This exciting new book examines the feasibility of using a method of doubling the capacity of cellular networks by simultaneously transmitting and receiving signals at the same frequency, a process known as full duplexing (FD). To realize full duplexing, changes in the hardware of the cell- base stations, relaying equipment, “hot spot” access points and mobile phones are necessary to prevent the hardware’s transmitters from interfering with their own receivers. This requires looking at how to separate the strong transmitted signal from the very weak received signal, a process requiring both hardware (analog) changes and more complex digital signal processing. Different ways of achieving that goal are examined. The books reviews the merits of hardware changes involving new duplexing components that may be different depending on the frequency band and cell hardware being used. Developing full duplex (FD) systems in 5G LTE cellular communications and what can be achieved with ferrite-based circulators in terms of size reduction and performance enhancement, especially at millimetric frequencies, is considered. The relative merits of ferrite and non-ferrite circulators are compared in terms of their fundamental materials and device technologies, such as isolation, insertion loss, bandwidth and non-linearity. FD in the entire 5G cell is also examined and its resulting range of equipment and device communication. This includes front-hauling, more sophisticated back and front-hauling, backhaul beam switching, and cell extenders and relays, all of which could involve FD.
