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Microwave Transmission

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    Microwave Transmission Microwave Transmission Presentation Transcript

    • Microwave
      • Prepared by:
      • Devang Bhatti
    • Microwave
      • Microwave technology has applications in all three of the wireless networking scenarios; LAN, Extended LAN and Mobile Computing.
      • Microwave communication can take two forms:
      • Terrestrial (Ground) links
      • Satellite links
    • Mobile Computing
      • Mobile computing is a growing technology that provides almost unlimited range of traveling computers by using satellite and cellular phone networks to relay signal to home network. Mobile computing typically is used with portable PCs or personal digit assistants(PDA) devices.
    • Mobile Computing
      • There are Three forms of mobile computing are as follows:
      • Packet-radio networking
      • Cellular networking
      • Satellite station networking
    • Terrestrial (Ground) links
      • Terrestrial microwave communication employs Earth-based transmitters and receivers. The frequencies used are in the low-gigahertz range, which limits all communications to line-of-sight . You probably have seen terrestrial microwave equipment in the form of telephone relay towers, which are placed every few miles to relay telephone signals cross country.
    • Terrestrial (Ground) links
      • used for long-distance telephone service
      • uses radio frequency spectrum, from 2 to 40 GHz.
      • parabolic dish transmitter, mounted high
      • used by common carriers as well as private networks
      • requires unobstructed line of sight between source and receiver
      • curvature of the earth requires stations (repeaters) ~30 miles apart
    • Terrestrial (Ground) links
      • Terrestrial microwave systems operate in the low gigahertz range, typically at 4-6 GHz and 21-23 GHz, and costs are highly variable depending on requirements. Long-distance microwave systems can be quite expensive but might be less costly than alternatives. (A leased telephone circuit, for example, represents a costly monthly expense). When line-of-sight transmission is possible, a microwave link is a one-time expense that can offer greater bandwidth than a leased circuit.
    • Terrestrial (Ground) links
    • Satellite links
      • a microwave relay station in space
      • can relay signals over long distances
      • geostationary satellites
        • remain above the equator at a height of 22,300 miles (geosynchronous orbit)
        • travel around the earth in exactly the time the earth takes to rotate
    • Satellite links
    • Satellite Links Applications
      • television distribution
        • a network provides programming from a central location
        • direct broadcast satellite (DBS)
      • long-distance telephone transmission
        • high-usage international trunks
      • private business networks
    • Microwave Advantages
      • No cables needed
      • Multiple channels available
      • Wide bandwidth
    • Microwave Disadvantages
      • Line-of-sight will be disrupted if any obstacle, such as new buildings, are in the way
      • Signal absorption by the atmosphere. Microwaves suffer from attenuation due to atmospheric conditions.
      • Towers are expensive to build