PPT-Frequency assignment for satellite communication systems

Kata KIATMANAROJ Supervisors Christian ARTIGUES Laurent HOUSSIN 1 Contents Problem definition Current state of the art Contributions Conclusions and perspectives 2 Problem definition 3. Yamuna Dhungana. Supervisor. : Dr. R.M.A.P. Rajatheva. May 16, 2011. Motivation. Goal. of 4G wireless Network : to offer high data rate and high quality of service anytime, anywhere. Condition. . : Such network can cover any geographical area by either using terrestrial network or satellite network. . Design, methods and applications. Background. Radio astronomers, interested in low frequency signals are troubled by Earth’s ionosphere, as it distorts and even blocks signals below 20 . MHz.. Past . Practice and Current Trends . Scott Schaire. NASA Goddard Space Flight Center. Near Earth Network Wallops Station Director. Deputy Project Manager Space Communication and Navigation (SCaN) Network Integration Project. Class Contents. Satellite Parameters and Configurations . Satellite Orbits. Frequency Bands. Transmission Impairments. Satellite Network Configurations . Capacity Allocation – Frequency Division. FDM (Frequency Division Multiplexing). CONTENTS. 1. INTRODUCTION . 2. . TECHNICAL OVERVIEW. 3. . CABIN ARCHITECTURE. 4. . SATELLITE CONNECTION. 5. SERVICE INTEGRATOR . 6. . . INTERFERENCE. 7. . . COLLECTIVELY . MOBILE HETEROGENEOUS . NETWORK . generations. First generation systems utilized . frequency axis. . to separate . users into different channels. Second generation systems added . time axis . to increase number of . users in eac. h channel. Types of communication systems. Coaxial (Wired). Microwave (Wireless). Satellite (Wireless). Cable (Wired). Cellular (Wireless). Technology that links the world. Coaxial. Courtesy: . customer.xfinity.com. . Prepared by:. Dr. . Ivica Kostanic. Lecture 7: Satellite sub-systems (2). (Section 3.5-3.7). Spring 2014. Page . 2. Block diagrams of transponders. Satellite antenna systems. Examples. Outline . Important note: Slides present summary of the results. Detailed derivations are given in notes.. : none. IT concepts. : . geostationary, medium-Earth, and low-Earth orbit satellite characteristics, spectrum and licensing, satellite technology progress, important Internet-service satellite projects and some of their implications. Frequency Management . Frequency management . Designating set-up channels and voice channels (done by the FCC), . Numbering the channels . (done by the FCC), and . Grouping the voice channels into subsets . Precision Agriculture. Chapter 3. The History of GPS. Feasibility studies begun in 1960’s.. Pentagon appropriates funding in 1973.. First satellite launched in 1978.. 1990’s Used in Persian Gulf War. Futuristic view of C4I systems in civil and defense -- Requirements and road map Sequence Command , Control, Communications, Computer & Intelligence (C4I ) Tenets of C4I Network-Centric Warfare Carrier . is strong and stable sinusoidal signal . x(t) = A cos(. w. c . t + . q. ). Carrier transports . information. (audio, video, text, email) across the world. Why is the carrier required?. Audio and video signals cannot travel over large distances since they are weak. School of Electrical . Engineering. DHA Suffa University, Karachi, Pakistan. email: . imtiaz.hussain@faculty.muet.edu.pk. URL :. http://imtiazhussainkalwar.weebly.com/. Lecture-1. Introduction. Note: .