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IEEE 802.16 (Wire less MAN)

IEEE 802.16 (Wire less MAN). Name: Ehsan Rohani Master: Dr. S.M.Fakhraeii E-mail: e.rohani@ece.ut.ac.ir. Figure Ref. http://www.ieee802.org/16/. Out line:. Abstract 802.16 Features 802.16 PHY Block Diagram 802.16a Features 802.16a – A Viable BWA Solution 802.16a Technical Specifications

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IEEE 802.16 (Wire less MAN)

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  1. IEEE 802.16 (Wire less MAN) Name: Ehsan Rohani Master: Dr. S.M.Fakhraeii E-mail: e.rohani@ece.ut.ac.ir Figure Ref. http://www.ieee802.org/16/

  2. Out line: • Abstract • 802.16 Features • 802.16 PHY Block Diagram • 802.16a Features • 802.16a – A Viable BWA Solution • 802.16a Technical Specifications • 802.16b Features • Some details about PHY Layer

  3. Abstract • Fixed Broadband Wireless Access (BWA) • Why BWA? • Fixed Broadband Wireless Channels • Combining TDMA and FDMA • TDMA operation • FDMA operation • IEEE 802.16 • IEEE 802.16 Issues

  4. Fixed Broadband Wireless Access (BWA) New “last mile” access technology Offers high speed voice, data and video servicend es Broadband access currently dominated by DSL and cable modem technologies

  5. Why BWA? • Advantages of BWA • Ease of deployment and installation • Much higher data rates can be supported • Capacity can be increased by installing more base stations • Challenges for BWA • Price • Performance • Interoperability issues

  6. Fixed Broadband Wireless Channels • Cells are less than 10 km in radius • Rooftop or window installed omni-directional antennas (2-10m) at the receiver • 15-40 m base station antennas • Variety of terrain and tree density types

  7. TDMA operation

  8. FDMA operation

  9. Combining TDMA and FDMA TDMA + FDMA operation = OFDMA

  10. IEEE 802.16 • IEEE Standard 802.16-2001 [1], completed in October 2001 and published on 8 April 2002 • It now has a standard forsecond generationwireless metropolitan area networks • USA specification designed to provide the "firstmile/last-mile" connection in wireless metropolitanarea networks(MAN)

  11. IEEE 802.16 • 10-66 GHz range, single carrier modulation • 2 to 11 GHz region due to be added during 2002 • LoS propagation • Supports continuously varying traffic levels • 54 Mbps data per channel • Uses different modulation schemes depending on type of data and error rates etc

  12. IEEE 802.16 Issues: • LoS not feasible for residential applications • Significant multi path • Outdoor mounted antennas expensive

  13. 802.16 Features • LMDS in 10 - 66GHz band • Point to Multipoint • Big block sizes • Air Interface designated “WirelessMAN-SC” • SC = Single Carrier Modulation • Usually QPSK 32 QAM • No OFD • Uplink Access by Time Division Multiple Access (TDMA) • Burst design allows both Time Division Duplex (TDD) andFrequency Division Duplex (FDD)

  14. IEEE 802.16aFeatures 802.16a approved as a standard on January 29, 2003, published on April 1, 2003 Roger Marks) The chairman of the 802.16a working group:( The new IEEE 802.16a standard reshapesthe broadband landscape. It closes thefirst-mile gap, giving users an easily installable, wire-free method to access corenetworks for multimedia applications

  15. Data Source Error Control Encoding OFDM Modulator Wireless Channel Channel Estimator BER Tester Error Control Decoding Channel Equalizer OFDM Demodulator 802.16 PHY Block Diagram

  16. IEEE 802.16aFeatures • Non-Line of Sight • 6MHz bandwidth in 2 - 11GHZ band • 10ms latency requirement • 3 Modualtion schemes • WirelessMAN-SC2 • Single Carrier modulation • WirelessMAN-OFDM • OFDM with 256-point FFT • TDMA access • WirelessMAN-OFDMA • OFDM with 2048-point FFT • Multiple carriers are assigned to multiple receivers to address multiple access

  17. 802.16a – A Viable BWA Solution • 2 – 11 GHz range, allows non LoS operation • Licensed and unlicensed spectrum • Key companies manufacturing 802.16a products: Soma Networks, IP Wireless, Flarion Technologies

  18. Some details about PHY Layer

  19. 802.16a Technical Specifications • Data rates: 4-70 Mbps • Bandwidth: 10, 20, 25 MHz • Physical layer • Single carrier • OFDM with 256 point transform • OFDMA with 2048 point transform, multiple access • MAC: Point to multipoint and Mesh architectures supported

  20. OFDM Receiver

  21. OFDM Modulation Schemes • 256 point FFT • 200 used (56 guard carriers) • 8 pilot carriers (192 data carriers) • Sampling rate: 8/7 of the RF bandwidth • QPSK, 16-QAM and 64-QAM • Cyclic prefix length 1/4, 1/8, 1/16, 1/32 of the number of subcarriers

  22. References • “Singapore Project DVB-RCT” Israel Koffmann – V.P. Marketing Runcom Technologies • Xilinx Solutions for Broadband Technologies • IEEE 802.16 Presentation Submission Template (Rev. 8) 2000-11-08 ,Bob Heise • “IEEE Standard 802.16:A Technical Overview of the Wireless MAN™ Air Interface for Broadband Wireless Access” Carl Eklund, Nokia Research Center

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