Wireless Communications
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Wireless Communications, Technologies and Standards

Wireless Communications, Technologies and Standards

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Wireless Communications Presentation Transcript

  • 1. Yasir Ahmed
  • 2.
      • Technologies: are the techniques, algorithms and formulas e.g. modulation techniques, channel coding techniques.
      • Standards: allow the implementation and integration of the various technologies e.g. GSM standard.
  • 3. CDMA TDMA GSM EVDO UMTS Wi-Max Wi-Fi IEEE802.11 OFDM GPRS IEEE802.16 MIMO
  • 4.
      • Time Division Multiple Access is a technology that is used by the GSM standard.
      • It allows eight GSM users to use the same frequency.
      • Each user gets a 0.577msec time slot in a GSM frame.
    1 2 3 4 5 6 7 8 0.577msec 4.616msec
  • 5.
      • Code Division Multiple Access is both a technology and a standard.
      • CDMA technology is based on the principle of differentiating users based on their unique codes.
      • CDMA standards include CDMA2000, WCDMA, EVDO…
  • 6.
      • Orthogonal Frequency Division Multiplexing is a technique that allows a signal to be transmitted at multiple frequencies.
      • So if the signal at one frequency gets corrupted, it would still get transmitted.
    f1 f2 f3 f4 f5 f6
  • 7.
      • Multi-Input Multi-Output systems make use of multiple antennas at the transmitter and receiver.
      • Using two antennas instead of one (at either end) improves the performance by several dB.
      • It is easier to implement multiple antennas at the base-station then in all the mobile devices.
  • 8.
      • Wi-Fi is a standard that uses both CDMA and OFDM.
      • It is also known as IEEE802.11.
      • It operates in the unlicensed 2.4GHz band and allows data rates of up to 54Mbps.
  • 9.
      • Wi-Max is a standard that uses a variant of OFDM.
      • Wi-Max operates in the licensed bands.
      • It is also known as IEEE802.16.
      • It uses a scheduling algorithm to allow access to the users.
  • 10. CDMA TDMA GSM EVDO UMTS Wi-Max Wi-Fi IEEE802.11 OFDM GPRS IEEE802.16 MIMO Standards Technologies