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Book Meteor Burst Communications

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.

Book Meteor Burst Communications

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.

Book Meteor Burst Communications

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:

Book Meteor Burst Communications

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:

Book Meteor Burst Communications

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.

Book The NBS Meteor burst Propagation Project

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:

Book Advanced Meteor Burst Communications

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:

Book A Long Range V H F Meteor burst Communications System

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:

Book Meteor Burst Communications Systems

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).

Book Adaptive Methods for Meteor burst Communications

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.

Book Meteor Burst Communication Without Feedback

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:

Book Meteor Burst Communications  Is This What the Navy Needs

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.

Book Meteor Burst Communications Improvement Study

Download or read book Meteor Burst Communications Improvement Study written by and published by . This book was released on 1993 with total page 162 pages. Available in PDF, EPUB and Kindle. Book excerpt: Two identical Meteor Burst Radio Terminals were developed, fabricated and delivered to the Air Force. Each is controlled by a PC computer in a memo driven manner. Mode of operation is full duplex. The RF frequency range is 40 to 60 MHz with tunning increments of 25 KHz. Data rates are 4, 8, 16, 32, 64, 128, 256, and 512 kbps. Modulation is coherent Binary Phase Shift Keying (BPSK) and incoherent Differential Phase Shift Keying (DPSK). Protocol includes Automatic Repeat Request (ARQ) with source and destination addressing, message number, start of message and end of message. Messages are packetized and Read Solomon (R-S) coding is an option. The ARQ is under control of a Cyclic Redundancy Check Code (CRCC) which detects binary errors within each packet. The terminal is intended to increase meteor trail availability and data throughput by several orders of magnitude - by operating with new antennas that provide much higher gains without sacrificing meteor trail acquisition performance.

Book A Practical Investigation of Meteor burst Communications

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:

Book Meteor Burst Communications  MBC  Throughput Improvement Tests

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:

Book Protocol Design and Analysis for a Meteor Burst Communication Channel

Download or read book Protocol Design and Analysis for a Meteor Burst Communication Channel written by Scott Lawrence Miller and published by . This book was released on 1988 with total page 248 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Simulation Model of a Meteor Burst Communication System for Data Transmission Protocol Evaluation

Download or read book Simulation Model of a Meteor Burst Communication System for Data Transmission Protocol Evaluation written by Donald D. Conklin and published by . This book was released on 1986 with total page 233 pages. Available in PDF, EPUB and Kindle. Book excerpt: There has been a recent dramatic Air Force interest in meteor burst communications. Due to the ability of a meteor trail to support propagation in the lower VHF band (40 to 100 MHz), it offers the potential for providing relatively survivable communications under disturbed ionospheric conditions. Meteor burst communication system performance and the chances of survivability could be increased if modifications were made in the current data transmission protocol used. A computer simulation model was developed to emulate a high latitude point to point meteor burst communication network. This unique model, written in the Pascal incorporates statistical meteor trial data collected by the High Latitude Meteor Scatter Test Bed, located in Northern Greenland. Measured meteor trail parameters used in the simulation model include average burst durations and interval between bursts for both underdense and oversense type meteor trail occurrences. A description of the developed simulation model is presented, as well as a discussion on how the simulation model was validated and used to test several modifications to the existing data transmission protocol.