ieee 802.11n

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ieee 802.11n

  1. 1. 1Windows Networking and Device Technologies January 27, 2005 WELCOME HAR IKRIHNAN. July 11, 2006 Presented by Harikrishnan.P.V S7 CSE Reg no: VIAHECS016
  2. 2. 2Windows Networking and Device Technologies January 27, 2005 IEEE 802.11n HAR IKRIHNAN. July 11, 2006
  3. 3. 3Windows Networking and Device Technologies January 27, 2005 HAR IKRIHNAN. July 11, 2006 1. In January 2004 IEEE announced that it had formed a new 802.11 TaskGroup (TGn) to develop a new amendment to the 802.11 standard for local-area wireless networks. The real data throughput is estimated to reach a theoretical 540 Mbit/s and should be up to 40 times faster than 802.11b, and near 10 times faster than 802.11a or 802.11g. 2. There were two competing proposals of the 802.11n standard: WWiSE (World-Wide Spectrum Efficiency), backed by companies including Broadcom, and TGn Sync backed by Intel and Philips. History HISTORY
  4. 4. 4Windows Networking and Device Technologies January 27, 2005 HARKRIHNAN. July 11, 2006 3.802.11n builds upon previous 802.11 standards by adding MIMO (multiple- input multiple-output) and orthogonal frequency-division multiplexing (OFDM). MIMO uses multiple transmitter and receiver antennas to allow for increased data throughput through spatial multiplexing and increased range by exploiting the spatial diversity. 4.The Enhanced Wireless Consortium (EWC) was formed to help accelerate the IEEE 802.11n development process and promote a technology specification for interoperability of next-generation wireless local area networking (WLAN) products
  5. 5. 5Windows Networking and Device Technologies January 27, 2005 802.11 WLAN Standards 802.11b802.11b 802.11a802.11a 802.11g802.11g 802.11n802.11n Standard ApprovedStandard Approved Sept.Sept. 19991999 Sept.Sept. 19991999 JuneJune 20032003 20062006 Available BandwidthAvailable Bandwidth 83.5 MHz83.5 MHz 580 MHz580 MHz 83.5 MHz83.5 MHz 83.5/58083.5/580 MHzMHz Frequency Band ofFrequency Band of OperationOperation 2.4 GHz2.4 GHz 5 GHz5 GHz 2.4 GHz2.4 GHz 2.4/5 GHz2.4/5 GHz Data Rate per ChannelData Rate per Channel 1 – 111 – 11 MbpsMbps 6 – 546 – 54 MbpsMbps 1 – 541 – 54 MbpsMbps 1 – 6001 – 600 MbpsMbps Modulation TypeModulation Type DSSS,DSSS, CCKCCK OFDMOFDM DSSS,DSSS, CCK,CCK, OFDMOFDM DSSS,DSSS, CCK,CCK, OFDM,OFDM, MIMOMIMO
  6. 6. 6Windows Networking and Device Technologies January 27, 2005 802.11n 1.Frequency most likely the 5GHz range, meaning possible compatibility with 802.11a 2.Throughput to match highest possible data rates- (raise the effective throughput of WLANs to at least 100M bps) 3.Defining standardized modifications to the 802.11 physical layers and MAC layers, which will improve not just data rates but also actual data throughput
  7. 7. 7Windows Networking and Device Technologies January 27, 2005 802.11n PHY Improvements 1. Improved coding and modulation 2. Backward compatibility 3. Number of antennas 4. MIMO and Spatial Multiplexing
  8. 8. 8Windows Networking and Device Technologies January 27, 2005 MIMO Wireless Systems Multiple Input Multiple Output (MIMO) systems with multiple parallel radios improve the following: • Outages reduced by using information from multiple antennas • Transmit power can be increased via multiple power amplifiers • Higher throughputs possible channel Radio D S P Bits TX Radio Radio D S P Bits RX Radio
  9. 9. 9Windows Networking and Device Technologies January 27, 2005 MIMO  The next generation WLAN uses MIMOThe next generation WLAN uses MIMO technologytechnology  Beamforming MIMO technologyBeamforming MIMO technology  Extends range of existing data rates by transmit andExtends range of existing data rates by transmit and receive beamformingreceive beamforming  Spatial-multiplexing MIMO technologySpatial-multiplexing MIMO technology  Increases data rates by transmitting parallel data streamsIncreases data rates by transmitting parallel data streams  MIMO allows system designers to leverageMIMO allows system designers to leverage Moore’s law to deliver higher performanceMoore’s law to deliver higher performance wireless systemswireless systems
  10. 10. 10Windows Networking and Device Technologies January 27, 2005 HAR IKRIHNAN. July 11, 2006 Operating Modes The PHY will operate in one of 3 modes Legacy Mode – in this mode packets are transmitted in the legacy 802.11a/g format. Mixed Mode – in this mode packets are transmitted with a preamble compatible with the legacy 802.11a/g. The rest of the packet has a new format. In this mode the receiver shall be able to decode both the Mixed Mode packets and legacy packets.
  11. 11. 11Windows Networking and Device Technologies January 27, 2005 HAR IKRIHNAN. July 11, 2006 Operating Modes–(cont) Green Field – in this mode high throughput packets are transmitted without a legacy compatible part. This mode is optional. In this mode the receiver shall be able to decode both Green Field mode packets, Mixed Mode packets and legacy format packets.
  12. 12. 12Windows Networking and Device Technologies January 27, 2005 HAR IKRIHNAN. July 11, 2006 Benefits of 802.11n: 1. Irresistible Performance and Range 2. Compelling Capacity 3. No Network Left Behind
  13. 13. 13Windows Networking and Device Technologies January 27, 2005 HAR IKRIHNAN. July 11, 2006 Challenges of 802.11n: 1. Enterprise Deployment Challenges 2. New Coverage Patterns 3. Variety of Client Devices 4. Consumer and Small Business Already Moving
  14. 14. 14Windows Networking and Device Technologies January 27, 2005 Conclusion It’s All Good 802.11n will substantially increase the performance and ubiquitous wireless access of laptops, desktops, smart phones and entertainment devices over the next several years. Without cost increase, just like the migration from 802.11 cousin 10 Mbps Ethernet to gigabit Ethernet, 802.11n will first appear in client devices and begin to be pervasively deployed in enterprises, homes and eventually metro networks. While there will be teething problems with this new technology, there is no doubt of its pervasive and inevitable deployment.
  15. 15. 15Windows Networking and Device Technologies January 27, 2005 THANK YOU…….

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