Adaptive Coded Modulation Classification and Spectrum Sensing for Cognitive Radio Systems. Adaptive Coded Modulation Techniques for Cognitive Radio Using Kalman Filter and Interacting Multiple Model Methods

The current and future trends of modern wireless communication systems place heavy demands on fast data transmissions in order to satisfy end users’ requirements anytime, anywhere. Such demands are obvious in recent applications such as smart phones, long term evolution (LTE), 4 & 5 Generations (4G & 5G), and worldwide interoperability for microwave access (WiMAX) platforms, where robust coding and modulations are essential especially in streaming on-line video material, social media and gaming. This eventually resulted in extreme exhaustion imposed on the frequency spectrum as a rare natural resource due to stagnation in current spectrum management policies. Since its advent in the late 1990s, cognitive radio (CR) has been conceived as an enabling technology aiming at the efficient utilisation of frequency spectrum that can lead to potential direct spectrum access (DSA) management. This is mainly attributed to its internal capabilities inherited from the concept of software defined radio (SDR) to sniff its surroundings, learn and adapt its operational parameters accordingly. CR systems (CRs) may commonly comprise one or all of the following core engines that characterise their architectures; namely, adaptive coded modulation (ACM), automatic modulation classification (AMC) and spectrum sensing (SS). Motivated by the above challenges, this programme of research is primarily aimed at the design and development of new paradigms to help improve the adaptability of CRs and thereby achieve the desirable signal processing tasks at the physical layer of the above core engines. Approximate modelling of Rayleigh and finite state Markov channels (FSMC) with a new concept borrowed from econometric studies have been approached. Then insightful channel estimation by using Kalman filter (KF) augmented with interacting multiple model (IMM) has been examined for the purpose of robust adaptability, which is applied for the first time in wireless communication systems. Such new IMM-KF combination has been facilitated in the feedback channel between wireless transmitter and receiver to adjust the transmitted power, by using a water-filling (WF) technique, and constellation pattern and rate in the ACM algorithm. The AMC has also benefited from such IMM-KF integration to boost the performance against conventional parametric estimation methods such as maximum likelihood estimate (MLE) for channel interrogation and the estimated parameters of both inserted into the ML classification algorithm. Expectation-maximisation (EM) has been applied to examine unknown transmitted modulation sequences and channel parameters in tandem. Finally, the non-parametric multitaper method (MTM) has been thoroughly examined for spectrum estimation (SE) and SS, by relying on Neyman-Pearson (NP) detection principle for hypothesis test, to allow licensed primary users (PUs) to coexist with opportunistic unlicensed secondary users (SUs) in the same frequency bands of interest without harmful effects. The performance of the above newly suggested paradigms have been simulated and assessed under various transmission settings and revealed substantial improvements

Optical Communication

Optical communication is very much useful in telecommunication systems, data processing and networking. It consists of a transmitter that encodes a message into an optical signal, a channel that carries the signal to its desired destination, and a receiver that reproduces the message from the received optical signal. It presents up to date results on communication systems, along with the explanations of their relevance, from leading researchers in this field. The chapters cover general concepts of optical communication, components, systems, networks, signal processing and MIMO systems. In recent years, optical components and other enhanced signal processing functions are also considered in depth for optical communications systems. The researcher has also concentrated on optical devices, networking, signal processing, and MIMO systems and other enhanced functions for optical communication. This book is targeted at research, development and design engineers from the teams in manufacturing industry, academia and telecommunication industries

Proceedings of the Third International Mobile Satellite Conference (IMSC 1993)

Satellite-based mobile communications systems provide voice and data communications to users over a vast geographic area. The users may communicate via mobile or hand-held terminals, which may also provide access to terrestrial cellular communications services. While the first and second International Mobile Satellite Conferences (IMSC) mostly concentrated on technical advances, this Third IMSC also focuses on the increasing worldwide commercial activities in Mobile Satellite Services. Because of the large service areas provided by such systems, it is important to consider political and regulatory issues in addition to technical and user requirements issues. Topics covered include: the direct broadcast of audio programming from satellites; spacecraft technology; regulatory and policy considerations; advanced system concepts and analysis; propagation; and user requirements and applications

Cumulative index to NASA Tech Briefs, 1986-1990, volumes 10-14

Tech Briefs are short announcements of new technology derived from the R&D activities of the National Aeronautics and Space Administration. These briefs emphasize information considered likely to be transferrable across industrial, regional, or disciplinary lines and are issued to encourage commercial application. This cumulative index of Tech Briefs contains abstracts and four indexes (subject, personal author, originating center, and Tech Brief number) and covers the period 1986 to 1990. The abstract section is organized by the following subject categories: electronic components and circuits, electronic systems, physical sciences, materials, computer programs, life sciences, mechanics, machinery, fabrication technology, and mathematics and information sciences

Proceedings of the Fifth International Mobile Satellite Conference 1997

Satellite-based mobile communications systems provide voice and data communications to users over a vast geographic area. The users may communicate via mobile or hand-held terminals, which may also provide access to terrestrial communications services. While previous International Mobile Satellite Conferences have concentrated on technical advances and the increasing worldwide commercial activities, this conference focuses on the next generation of mobile satellite services. The approximately 80 papers included here cover sessions in the following areas: networking and protocols; code division multiple access technologies; demand, economics and technology issues; current and planned systems; propagation; terminal technology; modulation and coding advances; spacecraft technology; advanced systems; and applications and experiments

Advanced Trends in Wireless Communications

Physical limitations on wireless communication channels impose huge challenges to reliable communication. Bandwidth limitations, propagation loss, noise and interference make the wireless channel a narrow pipe that does not readily accommodate rapid flow of data. Thus, researches aim to design systems that are suitable to operate in such channels, in order to have high performance quality of service. Also, the mobility of the communication systems requires further investigations to reduce the complexity and the power consumption of the receiver. This book aims to provide highlights of the current research in the field of wireless communications. The subjects discussed are very valuable to communication researchers rather than researchers in the wireless related areas. The book chapters cover a wide range of wireless communication topics

Summary of Research 1994

The views expressed in this report are those of the authors and do not reflect the official policy or position of the Department of Defense or the U.S. Government.This report contains 359 summaries of research projects which were carried out under funding of the Naval Postgraduate School Research Program. A list of recent publications is also included which consists of conference presentations and publications, books, contributions to books, published journal papers, and technical reports. The research was conducted in the areas of Aeronautics and Astronautics, Computer Science, Electrical and Computer Engineering, Mathematics, Mechanical Engineering, Meteorology, National Security Affairs, Oceanography, Operations Research, Physics, and Systems Management. This also includes research by the Command, Control and Communications (C3) Academic Group, Electronic Warfare Academic Group, Space Systems Academic Group, and the Undersea Warfare Academic Group

Bulletin of scientific and art research : annual report for 2018

The SASA Fund allotted the available resources for the following purposes: scientific and art research projects, scientific publications, international scientific cooperation, the organization of scientific meetings, participation of SASA members and their associates in scientific meetings in the country and abroad, acquisition of scientific literature and other purposes under the SASA Scientific and Art Research Programme. In 2018, the SASA Scientific and Art Research Programme contained 28 projects in the fields of mathematics, physics and earth sciences, 20 in the fields of chemical and biological sciences; 13 in the fields of technical and technological sciences; 28 in the field of medical sciences, 12 in the fields of language and literature; 16 in the field of social sciences; 25 in the field of historical sciences, and 8 in the fields of visual arts and music. During the year, the SASA published 52 editions, including 13 journal issues, 19 collections of papers, 13 catalogues, five monographs, two jubilee bibliographies and Volume XX of the SASA Dictionary, while 1,162 authors published 540 papers. The first-ever commercial Catalogue of the SASA Editions: 2016–2017–2018 (Katalog izdanja SANU: 2016–2017–2018) was prepared and published. In addition, 22 manuscripts were technically processed and prepared for publication; the make-up and cover design of six publications were finished. The SASA maintained regular contact with the National Library of Serbia concerning the preparation of a Cataloguing in Publication (CIP) record for all SASA editions. Fourteen manuscripts in the Serbian language underwent orthographic editing and 15 publications underwent proofreading, thus being prepared for publishing. The Serbian Academy of Sciences and Arts hosted the meeting of the COST (European Cooperation in Science and Technology) Action titled “Maximizing Impact of Research in Neurodevelopmental Disorders”. It was the first formal meeting of the COST Action which has so far been joined by about 50 researchers from 20 European countries. During 2018, two lecture cycles were held: “The Fascinating World of Nanoscience and Nanotechnology” (Fascinantni svet nanonauke i nanotehnologije) and “Geohazard in 21st Century Serbia: Knowledge Is the Best Bulwark Against the Elements” (Geohazard u Srbiji u 21. veku – Znanje je najbolji bedem protiv stihije), totalling 11 lectures. In 2018, at the proposal of the SASA Departments and SASA Executive Board, 12 lectures were held. Pursuant to the Decision of the Professional Council of the SASA Library, the SASA Library Day will be celebrated on 14 June. The SASA Library started working on this day, when it received the first books from Dimitrije Tirol. Its first librarian was Konstantin Bogdanović. The SASA Library Day was marked by the celebration honouring Aleksa Šantić. In 2018, the SASA Library organized 17 forums. It presented 18 books and 13 collections of papers by SASA members, SASA editions, as well as the research institutes and centres founded by the SASA. It staged 12 chamber exhibitions. Pursuant to the Decision of the Professional Council of the SASA Library, the SASA Library Day will be celebrated on 14 June. The SASA Library started working on this day, when it received the first books from Dimitrije Tirol. Its first librarian was Konstantin Bogdanović. The SASA Library Day was marked by the celebration honouring Aleksa Šantić. In 2018, the SASA Library organized 17 forums. It presented 18 books and 13 collections of papers by SASA members, SASA editions, as well as the research institutes and centres founded by the SASA. It staged 12 chamber exhibitions. The SASA Library also published the jubilee Bibliography of Academician Nikola Tasić’s Works, authored by Milena Obradović, and the sixth issue of the SASA Library Forum Almanac (Godišnjak “Tribina Biblioteke SANU”). The 293-page issue of the Almanac contains the presentations given at the forums in 2017. In 2018, the SASA Gallery staged eight thematic exhibitions on its premises: “Stojan Novaković and His Era” (Stojan Novaković i njegovo doba), “So, you are Uroš Predić?“ (Dakle, vi ste taj Uroš Predić), “35 Years of Petnica” (35 godina Petnice), “Mihailo Petrović Alas, the Founding Father of the Serbian School of Mathematics” (Mihailo Petrović Alas, rodonačelnik srpske matematičke škole), “Nedeljko Gvozdenović. On a Quest for Absolute Painting” (Nedeljko Gvozdenović. U potrazi za apsolutnim slikarstvom), “Roman Limes and Cities in Serbia” (Rimski limes i gradovi u Srbiji), 57th October Salon. “The Marvellous Cacophony” (57. Oktobarski salon. Čudo kakofonije), “Marko Čelebonović (1902-1986)”, Retrospective Exhibition (Marko Čelebonović /1902-1986/. Retrospektivna izložba). All exhibitions were accompanied by catalogues, lectures and expert guidance. Six catalogues were printed and one was prepared for printing. The exhibitions staged outside the SASA Gallery included: “SASA Art Collection – Academician Artists” (Umetnička zbirka SANU – likovni umetnici akademici), which toured Požarevac, Leskovac and Svilajnac, and “Olga Jevrić Exhibition – Sculptures” (Izložba Olga Jevrić – skulpture) in Užice. Seven new exhibitions were also prepared. In 2018, the Gallery of the Serbian Academy of Sciences and Arts organized 74 concerts within the relevant cycles. The concert-related activity of the SASA Gallery is headed by Academician Ivan Jevtić. During the year, the SASA Gallery of Science and Technology staged 15 exhibitions, supported by rich accompanying programmes. The names of these exhibitions were “Roma Tribulation in World War I” (Stradanje Roma u Prvom svetskom ratu); “Ivan Djaja. The Belgrade School of Physiology – from the Sorbonne to Belgrade” (Ivan Djaja. Beogradska škola fiziologije – od Sorbone do Beograda); “Brain Awareness Week 2018 – All Sides of Consciousness” (Nedelja svesti o mozgu – Sve strane svesti); “Traditional Architectural Heritage in the Area of the Stara Planina” (Tradicionalno arhitektonsko nasledje u regionu Stare planine); “The History of Toxicology” (Istorija toksikologije); THE POWER OF HERBS – The 70th Anniversary of the Institute for Medicinal Herb Research “Dr Josif Pančić” (MOĆ BILJA – povodom 70 godina rada Instituta za proučavanje lekovitog bilja “Dr Josif Pančić”); “This too Is Serbia, ’68 in Student” (I ovo je Srbija, ’68. u Studentu); “Archaeological Forensics – 20 Years of New Archaeological Invesigations of Vinča” (Forenzika drevnosti – 20 godina novih arheoloških istraživanja lokaliteta Vinča); “Serbian Lexicography from Vuk to the Present Day” (Srpska leksikografija od Vuka do danas); “Jovan Stejić, First Serbian Doctorof Medicine in Restored Serbia” (Jovan Stejić, prvi Srbin doktor medicine u obnovljenoj Srbiji); The Salonika Front, 1916-1918 (Solunski front 1916- 1918); World War One in Miniature (Prvi svetski rat u minijaturi), and ON ARCHITECTURE 2018 (O ARHITEKTURI 2018). The exhibitions were supported by the relevant catalogues (5) and rich accompanying programmes. In 2018, the SASA Archives enriched its holdings by numerous gifts. It finished processing Academician Vasa Čubrilović’s manuscript legacy and Patriarch German Andjelić’s legacy. The processing of Dragoljub Jovanović’s legacy will be finished during the first few months of 2019. The work on organizing the collection held in the Cabinet for Medals was carried out. The electronic Incoming Inventory of the Cabinet was prepared. All decorations were sorted out and placed into archival boxes in order to ensure better protection and facilitate handling. The Central Institute for Conservation conserved 169 decorations. More than 800 decorations were photographed and cataloguing was done in accordance with all museological processing rules. The website and digital presentation were created, and the biographies of all donors were written. The result of this work is the permanent exhibition of the Cabinet for Medals, which was opened on the Day of the Academy on 19 November 2018. During the past year, the SASA archivists catered to 223 researchers. The reference library of the SASA Archives was enriched by 70 new books.Ima izdanje na drugom jeziku: Билтен Фонда САНУ за истраживања у науци и уметности = ISSN 2466-428