rec4 - 15.020 Competition in Telecoms Recitation #4 Othman...

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15.020 Competition in Telecoms Recitation #4 Othman Laraki Credits to Simon Hughes
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Wireless Concepts •Cell site: transmitter, receiver, base station •Mobile Switching Center •Frequency reuse through separated cell sites PSTN Mobile Switching Center Cellular Tower Cell Phone User #1 Cell Phone User #2 Cell Phone User #3 etc… Based on: Dell White Paper: Wireless Technologies
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A Bit of History • Cellular Technologies – 1985: Analog (1st Generation, voice): 800 Mhz band – 1991: Digital (2nd Generation, limited data transfer) • 800 and 900 MHz frequency bands • PCS in 1800 and 1900 MHz frequency bands – 2000: 3rd Generation (UMTS) – Access Methods • Multiplex several calls onto single cellular channel – FDMA: Frequency Division Multiple Access (analog) – CDMA: Code Division Multiple Access (codes) – TDMA: Time Division Multiple Access (timeslots)
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Multiplexing Technologies Allow multiple calls to share a single connection • TDM Time Division Multiplexing (digital)
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This note was uploaded on 01/17/2012 for the course MGMT 15.020 / 1 taught by Professor Prof.jerryhausman during the Fall '03 term at MIT.

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rec4 - 15.020 Competition in Telecoms Recitation #4 Othman...

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