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How

How. Mobile. Phones. Work. What is a cell phone?. ? ? ?. A cell phone. IS. a. RADIO. Radio Telephone. Half Duplex System. In half - duplex radio, both transmitters use the same frequency. Only one party can talk at a time. Frequency Reuse.

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  1. How Mobile Phones Work

  2. What is a cell phone? ? ? ? . A cell phone IS a RADIO

  3. Radio Telephone

  4. Half Duplex System In half-duplex radio, both transmitters use the same frequency. Only one party can talk at a time.

  5. Frequency Reuse Because cell phones and base stations use low-power transmitters, the same frequencies can be reused in non-adjacent cells.

  6. Full Duplex System In full-duplex radio, the two transmitters use different frequencies, so both parties can talk at the same time. Cell phones are full-duplex.

  7. 0G * PTT * MTS * IMTS * AMTS 0.5G * Autotel/PALM * ARP 1G * NMT * AMPS * Hicap * CDPD * Mobitex * DataTac 2G * GSM * iDEN * D-AMPS * IS-95/cdmaOne * PDC * CSD * PHS 2.5G * GPRS * HSCSD * WiDEN 2.75G * CDMA20001xRTT/IS-2000 * EDGE (EGPRS) 3G * W-CDMA o UMTS (3GSM) o FOMA * 1xEV-DO/IS-856 * TD-SCDMA * GAN/UMA 3.5G * HSDPA 3.75G * HSUPA 4G History of mobile phones

  8. Hello dude. First Generation What’s up. Frequency division multiple access

  9. 1100100 1100110110011 0110010010110 1100110001011 Hello Second Generation What’s up. 10001111000010 00101000001111 00010001111000 1111011 Time division multiple access Code division multiple access

  10. 3G comprises several cellular access technologies. The most three common ones are: Third Generation • CDMA2000 - based on 2G Code Division Multiple Access • WCDMA (UMTS) – Wideband Code Division Multiple Access • TD-SCDMA – Time-division Synchronous Code-division Multiple Access

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