IEEE 802.16 (Wire less MAN)

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IEEE 802.16 (Wire less MAN)

• Name Ehsan Rohani
• Master Dr. S.M.Fakhraeii
• E-mail e.rohani_at_ece.ut.ac.ir

Figure Ref. http//www.ieee802.org/16/
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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

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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

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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

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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

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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

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TDMA operation
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FDMA operation
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Combining TDMA and FDMA
TDMA FDMA operation OFDMA
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IEEE 802.16

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

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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

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IEEE 802.16 Issues

• LoS not feasible for residential applications
• Significant multi path
• Outdoor mounted antennas expensive

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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) and Frequency Division Duplex (FDD)

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IEEE 802.16a Features

• 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 reshapes the
  broadband landscape. It closes the first-mile
  gap, giving users an easily installable,
  wire-free method to access core networks for
  multimedia applications

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802.16 PHY Block Diagram
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IEEE 802.16a Features

• 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

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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

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Some details about PHY Layer
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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

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OFDM Receiver
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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

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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 802.16A Technical Overview of the
  Wireless MAN Air Interface for Broadband
  Wireless Access Carl Eklund, Nokia Research
  Center