Wideband HF. Book jacket.

This volume constitutes the refereed post-conference proceedings of the Fourth International Conference on Machine Learning and Intelligent Communications, MLICOM 2019, held in Nanjing, China, in August 2019. The 65 revised full papers were carefully selected from 114 submissions. The papers are organized thematically in machine learning, intelligent positioning and navigation, intelligent multimedia processing and security, wireless mobile network and security, cognitive radio and intelligent networking, IoT, intelligent satellite communications and networking, green communication and intelligent networking, ad-hoc and sensor networks, resource allocation in wireless and cloud networks, signal processing in wireless and optical communications, and intelligent cooperative communications and networking.

This comprehensive resource provides the latest information on digitization and reconstruction (D&R) of analog signals in digital radios. Readers learn how to conduct comprehensive analysis, concisely describe the major signal processing procedures carried out in the radios, and demonstrate the dependence of these procedures on the quality of D&R. The book presents and analyzes the most promising and theoretically sound ways to improve the characteristics of D&R circuits and illustrate the influence of these improvements on the capabilities of digital radios. The book is intended to bridge the gap that exists between theorists and practical engineers developing D&R techniques by introducing new signal transmission and reception methods that can effectively utilize the unique capabilities offered by novel digitization and reconstruction techniques.

This book explores Radio Access Networks (RANs) within LMR systems, comprising base stations, mobile radios, and hand portable radios. These components facilitate communication among end users via a network of fixed base stations, antennas, and combining systems strategically placed across radio repeater sites throughout the coverage area. This resource also delves into the consequences of interference, highlighting the painstaking efforts required to diagnose and rectify interference issues through field testing and redesign. The central focus being on the design intricacies of base station antennas and combining systems at densely populated shared radio repeater sites. The book underscores how to identify potential sources of interference from co-located transmitters and receivers, effectively surveying sites to anticipate high-level interfering signals. This critical information forms the foundation for crafting base station antenna and combining systems that curtail interference, subsequently optimizing coverage and minimizing costs. Throughout its pages, the book lays out a detailed roadmap for designing LMR systems resilient to interference. By outlining essential principles and methodologies, the book guides practitioners in creating LMR networks that flawlessly align with end users' communication requirements. The resulting systems not only meet expectations but surpass them, offering the coverage area and communication quality demanded by public safety and utility organizations during critical operations. Ultimately, the book serves as an indispensable resource for engineers, designers, and professionals engaged in crafting LMR systems capable of delivering impeccable performance and reliability.

A comprehensive textbook that overviews common technologies utilized within the homeland security enterprise with an emphasis on contemporary homeland security mission areas and end-user applications. Designed for students entering or currently working in the safety, security, and emergency management disciplines in the public or private sectors, this textbook presents a broad array of homeland security technology types from the viewpoint of end-user applications and homeland security mission areas. The authors investigate various theories behind the use of technologies and assess the importance of technologies for achieving goals and objectives. The content includes not only technical capabilities but also a blend of sample applications of technologies using an all-hazards framework and use cases at all levels of practice, including both the public and private sectors. The authors provide an overview of preparedness applications; preventive and protective systems; and mitigation, response, and recovery technologies. Topics such as ethical and privacy concerns associated with implementing technologies and use of the Internet and social media receive special attention. In addition to readers directly involved in the security disciplines, this book will be useful for students in technical fields of study such as geographic information systems (GIS), computer science, or engineering who are seeking information on standards, theories, and foundations underlining homeland security technologies.

In einem sogenannten Software-Radio werden die Modulations-Wellenformen nicht durch herkömmliche elektronische Schaltungen, sondern durch eine Software erzeugt. Die so generierten digitalen Signale werden durch einen Breitband-D/A-Wandler in das gewünschte analoge modulierte Signal überführt. Grundlagen und Anwendungen der Technologie erläutert der Autor dieses Bandes, gestützt auf jahrelange Erfahrungen als Seminarleiter. (11/00)

In response to a request from the Defense Advanced Research Projects Agency, the committee studied a range of issues to help identify what strategies the Department of Defense might follow to meet its need for flexible, rapidly deployable communications systems. Taking into account the military's particular requirements for security, interoperability, and other capabilities as well as the extent to which commercial technology development can be expected to support these and related needs, the book recommends systems and component research as well as organizational changes to help the DOD field state-of-the-art, cost-effective untethered communications systems. In addition to advising DARPA on where its investment in information technology for mobile wireless communications systems can have the greatest impact, the book explores the evolution of wireless technology, the often fruitful synergy between commercial and military research and development efforts, and the technical challenges still to be overcome in making the dream of "anytime, anywhere" communications a reality.