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L10 - The Mobile Telephone System First generation Analog...

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The Mobile Telephone System First generation : Analog voice 1960's IMTS - 23 voice channels,100 kilometer region, 150-450 mhz band. High power, few users. 1982 - AMPS (Advanced Mobile Phone System) 10 kilometer cells - allows about 100 cells in same 100 kilometer region + only 1% of power of old system. 7-cell frequency reuse. One base station per cell.
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Increasing capacity with microcells - higher density, less power, but more base stations.
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Expanded AMPS: 832 Full duplex channels - (uplink) 824-849 mhz (downlink) 869-894 mhz. ( Full duplex means: transmission between two end points can be in both directions at the same time. Each mobile gets an uplink channel and a downlink channel.) Frequency reuse - group of 7 cells About 30 khz per- channel bandwidth. 21channels reserved for control. Others for paging, access, fax, data. Frequency division multiplexing. 45 voice channel subbands per cell.
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: Digital Voice Three systems. 1. D- AMPS (Digital Advanced Mobile Phone Service) Same 30 khz channels as AMPS, but new bands, uplink - 1850-1910 mhz downlink - 1930-1991 mhz. (Also old AMPS bands can be used.) Uses voice data compression- at cell phone. 8 kbps instead of 56 kbps.
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  • Spring '09
  • JOHNMETZNER
  • Frequency Division Multiplexing, Orthogonal Signals, IEEE Commun, advanced mobile phone, khz perchannel bandwidth

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L10 - The Mobile Telephone System First generation Analog...

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