Coherent Phase - Sift - Keyed Demodulation Using Derived Synchronization PDF Download

Author: Richard F. Mack
Publisher:
ISBN:
Category : Phase modulation
Languages : en
Pages : 138

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Author: Amitabha Ghosh
Publisher:
ISBN:
Category :
Languages : en
Pages : 0

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The major part of the work described in the thesis is a study of a novel technique for the demodulation of two level phase shift keyed signals. Its advantage over conventional coherent demodulation methods is that it uses a free running oscillator as the local oscillator in the receiver, which is not locked to the transmitted carrier signal. Thus this novel system does not require the complex synchronisation techniques used in conventional phase shift keyed demodulators. This new demodulator like conventional coherent demodulators has not got the fixed speed disadvantage of differential phase shift keying. This new demodulator also referred to as a Quasi-Coherent demodulator has been characterised both theoretically and experimentally and compared with conventional coherent and differential phase shift-keyed systems. The possibility of extending this technique to multiphase phase shift keyed system is also discussed. The performance of a multilevel coherent phase shift keyed system in the presence of interference can be predicted by computing the exact mathematical equation for the error rate. In the thesis an approximate, but quick and simple method has been developed to, predict the performance of multilevel coherent phase shift keyed system from the well known result of a two level coherent phase shift keyed system. In all the interference analysis so far done by other authors, it is assumed that the reference at the receiver is coherent with the received signal. However, it is evident that in the presence of a strong interference, a phase locked loop derived reference will in general be coherent with the composite signal (i.e. signal plus interference plus noise) and not with the signal as assumed by previous authors. The effect of such a reference i.e. coherent with the composite signal on the performance of a two level system has been discussed fully in chapter four. The performance of a digital system also depends on the receiving filter characteristic and on the sampling jitter that is inevitably present in the sampling pulse in the decision circuitry of the receiver. The effect of these two factors on the performance of a two level coherent phase shift keyed system has been fully discussed in chapter five.

Author: A. Ghosh
Publisher:
ISBN:
Category :
Languages : en
Pages : 212

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Author: Fawaz Raffoul Bassim
Publisher:
ISBN:
Category :
Languages : en
Pages : 226

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Author: Swarup Bhunia
Publisher: Elsevier
ISBN: 0323261906
Category : Technology & Engineering
Languages : en
Pages : 337

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Research and innovation in areas such as circuits, microsystems, packaging, biocompatibility, miniaturization, power supplies, remote control, reliability, and lifespan are leading to a rapid increase in the range of devices and corresponding applications in the field of wearable and implantable biomedical microsystems, which are used for monitoring, diagnosing, and controlling the health conditions of the human body. This book provides comprehensive coverage of the fundamental design principles and validation for implantable microsystems, as well as several major application areas. Each component in an implantable device is described in details, and major case studies demonstrate how these systems can be optimized for specific design objectives. The case studies include applications of implantable neural signal processors, brain-machine interface (BMI) systems intended for both data recording and treatment, neural prosthesis, bladder pressure monitoring for treating urinary incontinence, implantable imaging devices for early detection and diagnosis of diseases as well as electrical conduction block of peripheral nerve for chronic pain management. Implantable Biomedical Microsystems is the first comprehensive coverage of bioimplantable system design providing an invaluable information source for researchers in Biomedical, Electrical, Computer, Systems, and Mechanical Engineering as well as engineers involved in design and development of wearable and implantable bioelectronic devices and, more generally, teams working on low-power microsystems and their corresponding wireless energy and data links. - First time comprehensive coverage of system-level and component-level design and engineering aspects for implantable microsystems. - Provides insight into a wide range of proven applications and application specific design trade-offs of bioimplantable systems, including several major case studies - Enables Engineers involved in development of implantable electronic systems to optimize applications for specific design objectives.

Author: Umberto Mengali
Publisher: Springer Science & Business Media
ISBN: 1489918078
Category : Technology & Engineering
Languages : en
Pages : 532

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Synchronization is a critical function in digital communications; its failures may have catastrophic effects on the transmission system performance. Furthermore, synchronization circuits comprehend such a large part of the receiver hardware that their implementation has a substantial impact on the overall costs. For these reasons design engineers are particularly concerned with the development of new and more efficient synchronization structures. Unfortunately, the advent of digital VLSI technology has radically affected modem design rules, to a point that most analog techniques employed so far have become totally obsolete. Although digital synchronization methods are well established by now in the literature, they only appear in the form of technical papers, often concentrating on specific performance or implementation issues. As a consequence they are hardly useful to give a unified view of an otherwise seemingly heterogeneous field. It is widely recognized that a fundamental understanding of digital synchronization can only be reached by providing the designer with a solid theoretical framework, or else he will not know where to adjust his methods when he attempts to apply them to new situations. The task of the present book is just to develop such a framework.

Author: Marvin K. Simon
Publisher: John Wiley & Sons
ISBN: 0471726184
Category : Technology & Engineering
Languages : en
Pages : 244

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An important look at bandwidth-efficient modulations with applications to today's Space program Based on research and results obtained at the California Institute of Technology's Jet Propulsion Laboratory, this timely book defines, describes, and then delineates the performance (power and bandwidth) of digital communication systems that incorporate a wide variety of bandwidth-efficient modulations appropriate for the design and implementation of space communications systems. The author compares the performance of these systems in the presence of a number of practical (non-ideal) transmitter and receiver characteristics such as modulator and phase imbalance, imperfect carrier synchronization, and transmitter nonlinearity. Although the material focuses on the deep space applications developed at the Jet Propulsion Laboratory, the presentation is sufficiently broad as to be applicable to a host of other applications dealing with RF communications. An important contribution to the scientific literature, Bandwidth-Efficient Digital Modulation with Application to Deep Space Communications * was commissioned by the JPL Deep Space Communications and Navigation System Center of Excellence * highlights many NASA-funded technical contributions pertaining to deep space communications systems * is a part of the prestigious Deep Space Communications and Navigation Series The Deep Space Communications and Navigation Series is authored by scientists and engineers with extensive experience in astronautics, communications, and related fields. It lays the foundation for innovation in the areas of deep space navigation and communications by disseminating state-of-the-art knowledge in key technologies.

Author: Debabrata Saha
Publisher:
ISBN:
Category : Digital communications
Languages : en
Pages : 123

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Like MSK, Q('2)PSK also has self clocking and self synchronizing ability. A synchronization scheme is presented for coherent demodulation of Q('2)PSK signal.

Author: Francis C.M. Lau
Publisher: Springer Science & Business Media
ISBN: 9783540006022
Category : Computers
Languages : en
Pages : 244

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Book Description
One of the first books in this area, this text focuses on important aspects of the system operation, analysis and performance evaluation of selected chaos-based digital communications systems – a hot topic in communications and signal processing.

Author: Fuyun Ling
Publisher: Cambridge University Press
ISBN: 110711473X
Category : Technology & Engineering
Languages : en
Pages : 399

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Book Description
This practical guide helps readers to learn how to develop and implement synchronization functions in digital communication systems.