WUSTL CSE 574S - WiMAX Part I: PHY (26 pages)

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WiMAX Part I: PHY



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WiMAX Part I: PHY

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Pages:
26
School:
Washington University in St. Louis
Course:
Cse 574s - Wireless and Mobile Networking
Wireless and Mobile Networking Documents

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WiMAX Part I PHY Raj Jain Professor of CSE Washington University in Saint Louis Saint Louis MO 63130 Jain cse wustl edu Audio Video recordings of this lecture are available on line at http www cse wustl edu jain cse574 08 Washington University in St Louis CSE574s 10 1 2008 Raj Jain Overview What is WiMAX Previous Broadband Wireless Access LMDS MMDS WiMAX PHY Layer Frequency Reuse Subchannelization Frame structure Washington University in St Louis CSE574s 10 2 2008 Raj Jain What is WiMAX Point to Multipoint 50km Point to Point Telco Core Base Stations BSs Uplink UL Downlink DL Rural Areas 120km sec Mobile Users Subscriber Station SSs 70Mbps Congested Areas Washington University in St Louis CSE574s 10 3 2008 Raj Jain Data rate vs Mobility Mobility Vehicular WiMAX Nomadic Cellular WiFi Stationary 0 1 1 10 100 User Link Bit Rate Mbits second Washington University in St Louis CSE574s 10 4 2008 Raj Jain Key Features of WiMAX Works on many bands 2 3 GHz 2 5 GHz 3 5 GHz Scalable Can use any available spectrum width 1 25 MHz to 28 MHz Strong security Open technology like WiFi Reach and mobility like Cellular but much higher data rates High data rate up to 70Mbps Long distance up to 50kms Mobility up to 120 to 150 km hour Data rate vs Distance trade off using adaptive modulation 64QAM to BPSK Offers non line of site NLOS operation Strong QoS Guaranteed services for data voice and video Washington University in St Louis CSE574s 10 5 2008 Raj Jain Prior Attempts LMDS MMDS Local Multipoint Distribution Service 1998 1 3 GHz around 28 GHz band Ka Band 28 GHz Rain effects Multi channel Multipoint Distribution Services 1999 2001 2 1 2 5 2 7 GHz Band Not affected by rain Issues Equipment too expensive Roof top LoS antennas short range LMDS or too small capacity MMDS Modem PoP Washington University in St Louis CSE574s 10 6 2008 Raj Jain WiMAX WiMAX IEEE 802 16 Worldwide Interoperability for Microwave Access 420 members including Semiconductor companies equipment vendors integrators



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