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    Wireless Networking


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    1 : Interest Area:-Wireless Networking & Topic:-Mobile Satellite Communication Yogesh Kumar Sohan Singh Naizoom Mansoori Group No:-14 Guided By:- Ashish Mishra
    2 : Mobile Satellite Communications (Channel Characterization and Simulation) Ajayi Taiwo Seun This thesis is presented as part of Degree of Master of Science in Electrical Engineering Blekinge Institute of Technology School of Engineering Department of Applied Signal Process & Telecommunications Supervisor: Dr. Abbas Mohammed Examiner: Dr. Abbas Mohammed
    3 : Topics of Presentation Future Work Intro Types How it works Mobile Satellite Satellites Mobility Work
    4 : INTRO : Satellite Communication In simplest form , a satellite communication can be thought of as a big microwave repeater in the sky. It contain several transponders
    5 : Satellite Transmission Satellite launch appro 36000 km from the earth Transponder are used in satellite
    6 : Classification of satellite communication
    7 :
    8 : Satellites Several types 1. GEOs - Geostationary earth orbit 2. LEOs - Low earth orbit 3. MEOs - Medium earth orbit
    9 : Geostationary satellite: If the satellite is in a circular orbit 35,863km above the earth’s surface and rotates in the equatorial plane of the earth, it will therefore rotate at exactly the same angular speed as the earth and will remain above the same spot on the equator as the earth rotates. The orbit must have an inclination angle of 0 degree.
    10 : Low earth orbit satellite LEO satellites revolve on the lower orbit at less than 2000km. Proposed and actual systems are in the range 500 to 1500km; it is obvious that they exhibit a much shorter period typically between 95 to 120 minutes. The diameter of coverage is about 8000km
    11 : Conti…………. The practical use of the satellite requires the multiple orbital planes be used, each with multiple satellites in orbit. Communication between two earth stations typically will involve handing off the signal from one satellite to another.
    12 : Medium Earth Orbit Medium Earth orbit satellites can be positioned somewhere in between LEOs and GEOs, both in terms of their orbit, also in their advantages and disadvantages. The circular orbit is at an altitude in the range of 5,000 to 12,000km, the period of the orbit is about 6 hours and the diameter of coverage is from 10,000 to 15,000km
    13 : Different types of satellite orbits
    14 : Type of satellite Astronomy satellites Atmospheric Studies satellites – Polar Communications satellites Navigation satellites Reconnaissance satellites
    15 : These are some pictures taken by the astronomy satellite Hubble of stellar phenomena like supernovas, distant galaxies, black holes Astronomy satellites Supernova Distant galaxies Black hole
    16 : Atmospheric Studies satellites They generally have pretty low Earth orbits so that they can study the Earth's atmosphere. A more recent example of a satellite studying the atmosphere is NASA's Polar satellite. Communications satellites Communications satellites allow radio, television, and telephone transmissions to be sent live anywhere in the world. Before satellites, transmissions were difficult or impossible at long distances. The signals, which travel in straight lines, could not bend around the round Earth to reach a destination far away. Because satellites are in orbit, the signals can be sent instantaneously into space and then redirected to another satellite or directly to their destination.
    17 : Navigation satellites Satellites for navigation were developed in the late 1950's as a direct result of ships needing to know exactly where they were at any given time. In the middle of the ocean or out of sight of land, you can't find out your position accurately just by looking out the window.
    18 : Reconnaissance satellites They provide intelligence information on the military activities of foreign countries
    19 : The procedure of the mobile wireless network planning
    20 : Basic Propagation Mechanisms
    21 :
    22 : Short History of Mobile It was basically started in Germany in 1958. In 1982 the European Conference of Postal and Telecommunications Administrations founded a working group. 1987 the Global System for Mobile (GSM) communications standard was available. 1991 in Switzerland the first devices are presented. In 1995 SMS was available
    23 : What is Mobile ? Moveable Device One(single) device can create Network, But can not Communicate himself Mobile IP Mobile registration
    24 : THE CASE OF MOBILE BROADCASTING INTEGRATION specific information to one user (P2P) ? mobile com. unspecific information to all users in a given area ? broadcasting Large memories introduce paradigm shift: mass storage dramatic cost reduction in receivers decouples consumption from production (c.f. TV-Anytime) filter & store data in user terminal local interactivity on stored content reaction by mobile communication (e.g. order a product)
    25 : Unicast MANET & Work Route Discovery Data Forwarding Route Maintenance
    26 : Multicasting for MANET Multicast Ad Hoc On-Demand Distance Vector On-Demand Multicast Routing Protocol
    27 : A wireless computer can "roam" from one access point to another, with the software and hardware maintaining a steady network connection by monitoring the signal strength from in-range access points. What is Roaming ?
    28 : Future Topic for the research: Try to reduce the concept of the Roaming in the future. When two person communicate then they can see the area(place) of each other.(3G-Technology)
    29 : Satellites remain the best utilization used for communications due to their speed and other advantages mentioned in this presentation. Thanks for Listening

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