WIRELESS COMMUNICATIONS

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Wireless communications is a type of data communication that is performed and delivered wirelessly. This is a broad term that incorporates all procedures and forms of connecting and communicating between two or more devices using a wireless signal through wireless communication technologies and devices.

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  • Introduction to Telecommunications by Gokhale
  • WIRELESS COMMUNICATIONS

    1. 1.  Mobile Telephone System (MTS) › Introduced in 1946 › Simplex (one-way transmission) and manual operation Improved Mobile Telephone System (IMTS) › Introduced in 1969 using a 450 MHz band Advanced Mobile Phone Service (AMPS) › Introduced in 1983 › First system to employ a “cellular” concept 2
    2. 2.  Cellular network: › Series of overlapping hexagonal cells in a honeycomb pattern Cellular network components › Base Station:Transmitter, Receiver, Controller, Antenna › Cell: Base station’s span of coverage › Mobile Switching Center: Contains all of the control and switching elements to connect the caller to the receiver, even as the receiver moves from one cell to another 3
    3. 3.  D-AMPS (Digital-AMPS) TDMA (Time Division Multiple Access) CDMA (Code Division Multiple Access) Digital wireless technologies provide greater system capacity. 4
    4. 4.  CDMA › Third generation system › Separates users by assigning them digital codes within a broad range of the radio frequency › First technology to use soft-handoff › Employs spread spectrum technique › Advantages  Improved capacity, coverage, voice quality, and immunity from interference 5
    5. 5. 6
    6. 6.  Cellular Phone › High mobility and narrow bandwidth (20 to 30 kHz) Cordless Phone › Low mobility and narrow bandwidth (20 to 30 kHz) Wireless LAN › Low mobility and high bandwidth (typically 10 Mbps) › Wireless Application Protocol (WAP) is a standard for wireless data delivery, loading web pages, and navigation 7
    7. 7.  Mobile telephone service - a system for providing telephone services to multiple, mobile receivers using two-way radio communication over a limited number of frequencies. Mobile wireless evolution: › First generation › Second generation › Third generation
    8. 8.  A version of time division multiple access (TDMA) technology, because it divides frequency bands into channels and assigns signals time slots within each channel. Makes more efficient use of limited bandwidth than the IS-136 TDMA standard common in the United States. Makes use of silences in a phone call to increase its signal compression, leaving more open time slots in the channel.
    9. 9.  Address -: c2mTech 1313 Valwood Suite #320  Carrollton, Texas 75006 Phone No -: (P) 972-881-2268 Dallas (P) 817-442-2268 Ft. Worth (F) 972-221-9366 Website -: http://www.c2mtech.com/ Sales Representative -: sales@c2mtech.com 11

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