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"Communication models"
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Behavioral Modeling and Predistortion of Wideband Wireless Transmitters
Covers theoretical and practical aspects related to the behavioral modelling and predistortion of wireless transmitters and power amplifiers. It includes simulation software that enables the users to apply the theory presented in the book. In the first section, the reader is given the general background of nonlinear dynamic systems along with their behavioral modelling from all its aspects. In the second part, a comprehensive compilation of behavioral models formulations and structures is provided including memory polynomial based models, box oriented models such as Hammerstein-based and Wiener-based models, and neural networks-based models. The book will be a valuable resource for design engineers, industrial engineers, applications engineers, postgraduate students, and researchers working on power amplifiers modelling, linearization, and design.
eBook
Language and Identity across Modes of Communication
The series contributes to the development of promising new approaches to the sociolinguistic, sociohistorical and linguistic anthropological study of social issues that centrally involve language. In particular, while still addressing the fundamental insights gleaned from variationist studies, foremost among which is the open-ended, heterogeneous nature of human language in all its varieties, it focuses on new, data-driven methodologies, quantitative and qualitative, in the social and cultural study of language that go beyond the more traditional concerns of sociolinguistics (for example, social networks, communities of practice, global population movements, the historical and present-day significance of demography for situations of language contact, the spatial dimensions of language, language and ideology, new dialect formation, historical sociolinguistics). The series includes monographs as well as edited volumes.
eBook
Principles of Broadband Switching and Networking
An authoritative introduction to the roles of switching and transmission in broadband integrated services networks Principles of Broadband Switching and Networking explains the design and analysis of switch architectures suitable for broadband integrated services networks, emphasizing packet-switched interconnection networks with distributed routing algorithms. The text examines the mathematical properties of these networks, rather than specific implementation technologies. Although the pedagogical explanations in this book are in the context of switches, many of the fundamental principles are relevant to other communication networks with regular topologies. After explaining the concept of the modern broadband integrated services network and why it is necessary in today’s society, the book moves on to basic switch design principles, discussing two types of circuit switch design—space domain and time domain—and packet switch design. Throughput improvements are illustrated by some switch design variations such as Speedup principle, Channel-Grouping principle, Knockout principle, and Dilation principle. Moving seamlessly into advanced switch design principles, the book covers switch scalability, switch design for multicasting, and path switching. Then the focus moves to broadband communications networks that make use of such switches. Readers receive a detailed introduction on how to allocate network resources and control traffic to satisfy the quality of service requirements of network users and to maximize network usage. As an epilogue, the text shows how transmission noise and packet contention have similar characteristics and can be tamed by comparable means to achieve reliable communication. Principles of Broadband Switching and Networking is written for senior undergraduate and first-year postgraduate students with a solid background in probability theory.
eBook
Studying impacts of communication system performance on dynamic stability of networked microgrid
The development of smart grid technologies has resulted in increased interdependence between power and communication systems. Many of the operations in the existing power system rely on a stable and secured communication system. For electrically weak systems and time-critical applications, this reliance can be even greater, where a small degradation in communication performance can degrade system stability. However, despite inter-dependencies between power and communication systems, only a few studies have investigated the impacts of communication system performance on power system dynamics. This study investigates the dependencies of power system dynamics operations on a communication system performance. First, a detailed, dynamic networked microgrid model is developed in the GridLAB-D simulation environment, along with a representative multi-traffic, multi-channel, multi-protocol communication system model, developed in the network simulator (ns-3). Second, a hierarchical engine for large-scale infrastructure co-simulation framework is developed to co-simulate microgrid dynamics, its communication system, and a microgrid control system. The impact of communication system delays on the dynamic stability of networked microgrids is evaluated for the loss of generation using three use-cases. While the example use-cases examine microgrid applications and the impact to resiliency, the framework can be applied to all levels of power system operations.
Journal Article
Interacting with objects : language, materiality, and social activity
This chapter develops an ethnomethodologically-informed view regarding the sociality of objects, building upon Garfinkel's various descriptions of object constitution. We examine a particular case of diagnostic reasoning produced in the course of carrying out a surgical procedure at a teaching hospital. Our interest is in the methods employed by the surgeons in resolving certain incongruities in the case as it presents itself. Through an occasioned process of inquiry, the case at hand comes to be seen in a new light. This revised clinical picture is the oriented object under consideration here and it is produced as a discovered matter. We describe it as an instructed object to emphasise that perception is a kind of action and can too be taught. For us, as for Garfinkel, instruction is a fundamental feature of how social order is created and shared understanding sustained. In the analysed example, the methods by which a new appreciation of the case is achieved are public and inspectable. Instructional settings are, in this way, 'perspicuous sites' for investigating how \"a world of meant objects\" is produced.
eBook