Download or read book Meteor Burst Communications written by Donald L. Schilling and published by Wiley-Interscience. This book was released on 1993-04-12 with total page 490 pages. Available in PDF, EPUB and Kindle. Book excerpt: Explores the meteor burst channel. Leading experts in the communications field cover the research, military and commercial applications of this subject. Following an introduction to the technology, early chapters describe this channel, the theory and modeling techniques used to simulate it and the use of variable data rate transmission for efficient communication. Later chapters present a method for implementing such a system using FM techniques, compare experimental results with theory, offer additional theoretical results obtained for the variable data rate techniques and discuss the improvement obtained through the use of forward error correction coding.
Download or read book Meteor Burst Communications written by Jacob Z. Schanker and published by Artech House Publishers. This book was released on 1990 with total page 200 pages. Available in PDF, EPUB and Kindle. Book excerpt: Presents the fundamentals, applications, system design considerations, protocols and future trends of this largely untapped communications technology.
Download or read book Meteor Burst Communications written by Joel F. Kirshman and published by . This book was released on 1990 with total page 136 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Meteor Burst Communications written by Payman Behboudikha and published by . This book was released on 1996 with total page 116 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Meteor Burst Communications written by Donald L. Schilling and published by Wiley-Interscience. This book was released on 1993-04-12 with total page 488 pages. Available in PDF, EPUB and Kindle. Book excerpt: Explores the meteor burst channel. Leading experts in the communications field cover the research, military and commercial applications of this subject. Following an introduction to the technology, early chapters describe this channel, the theory and modeling techniques used to simulate it and the use of variable data rate transmission for efficient communication. Later chapters present a method for implementing such a system using FM techniques, compare experimental results with theory, offer additional theoretical results obtained for the variable data rate techniques and discuss the improvement obtained through the use of forward error correction coding.
Download or read book The NBS Meteor burst Propagation Project written by Charles E. Hornback and published by . This book was released on 1960 with total page 52 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Advanced Meteor Burst Communications written by Robert I. Desourdis and published by . This book was released on 1999 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Long Range V H F Meteor burst Communications System written by Russell Wolfram and published by . This book was released on 1957 with total page 132 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Meteor Burst Communications Systems written by M. Irving and published by . This book was released on 1989 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Earth's atmosphere is constantly bombarded by vast numbers of meteors, travelling at thousands of kilometres per hour. Upon entering the atmosphere, the friction of the air produces enough heat to completely vaporise these meteors. In the denser atmosphere at around 115 km altitude, the vaporised atoms collide with air molecules, producing a trail of free electrons. Complete vaporisation generally occurs by 80 km altitude. This document presents a summary of Meteor Burst Communication Systems, based on the results of twenty-nine papers published between 1953 and 1988. It also includes information on the various modelling techniques employed. Australia. (JES).
Download or read book Adaptive Methods for Meteor burst Communications written by Stuart Daniel Sandberg and published by . This book was released on 1990 with total page 244 pages. Available in PDF, EPUB and Kindle. Book excerpt: We investigate various methods for making efficient use of the time-varying power received by radio reflection from meteor trails, including applications of variable-rate coding and variable-rate transmission. For variable-rate coding, the code rate is changed periodically during the life of the trail in an attempt to match the rate to the instantaneous signal power. For a system that employs packet transmissions, we develop an algorithm that determines the number of codewords and the rate for each codeword that maximize the probability of successful decoding for the packet. The optimal packet configuration is a function of the length of the message and the underdense trail decay constant. It is shown that the signal power required to obtain a given probability of success is significantly smaller for optimal variable-rate coding than for fixed-rate coding. We also consider the incorporation of variable-rate coding in automatic-repeat-request (ARQ) protocols. A variation of type-I hybrid ARQ called variable-rate type-I hybrid ARQ is introduced. For one implementation, measurements of the trail parameters are used to select the code rate, while, for another, the selection is based on previous decoding outcomes. The throughput for each implementation is compared with the throughput for optimal variable-rate type-I hybrid ARQ. It is shown that each implementation gives significantly larger throughput than fixed-rate type-I hybrid ARQ and ARQ without forward-error-correction. For type-II hybrid ARQ, code rate variation is inherent in the coding scheme. On the first transmission, the code is effectively of high rate, but if an additional transmission is required, additional redundant symbols are sent, and the code rate is effectively lower for each subsequent transmission. The throughput for type-II hybrid ARQ is compared with the throughput for variable-rate type-I hybrid ARQ. For variable-rate transmission, the pulse length is changed periodically, based on measurements of the signal power at the destination. We have determined the maximum reliable throughput that can be obtained for variable-rate transmission, when the source and destination have perfect knowledge of the signal power and can choose from an infinite number of pulse lengths for each pulse.
Download or read book Meteor Burst Communication Without Feedback written by Jens Zander and published by . This book was released on 1992 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Meteor Burst Communications Is This What the Navy Needs written by Gretchen Ann Helweg and published by . This book was released on 1987 with total page 115 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis evaluates the limitations of meteor-burst communications for Navy requirements. The author examines the basic physics of the meteor-burst concept and the history of meteor-burst systems to determine inherent or persistent shortcomings. These findings are then compared to ongoing research and Navy applications for this communications medium. Limitations of meteor-burst communications are discussed with respect to potential Navy applications. Recommendations of possible applications of this technology are provided.
Download or read book A Practical Investigation of Meteor burst Communications written by Stuart William Melville and published by . This book was released on 1991 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Meteor Burst Communications MBC Throughput Improvement Tests written by and published by . This book was released on 1993 with total page 70 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Multipath and Fading Profile of the High Latitude Meteor Burst Communication Channel written by Jay A. Weitzen and published by . This book was released on 1986 with total page 108 pages. Available in PDF, EPUB and Kindle. Book excerpt: High latitude propagation phenomenon such as scatter from the aurora and sporadic-E propagation can alter the communication characteristics of the high latitude meteor communication channel. This report describes the results of several experiments conducted for the purpose of characterizing the fading and multipath profile of the high latitude meteor communication channel. The effect of high latitude propagation phenomena on the capacity and reliability of meteor burst communications is discussed. Keywords include: Auroral scatter, Meteor scatter high latitude effects, multipath measurements, meteor scatter communications, and VHF propagation.
Download or read book METEOR BURST SYSTEM COMMUNICATIONS COMPATIBILITY written by D. Cohen and published by . This book was released on 1989 with total page 103 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Effects of Absorption on High Latitude Meteor Scatter Communication Systems written by and published by . This book was released on 1991 with total page 42 pages. Available in PDF, EPUB and Kindle. Book excerpt:
