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Overview of WiMAX Technology and Cognitive Radio Testbed Development at CU Boulder

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This document provides a comprehensive overview of the WiMAX technology landscape and details the experience of designing and building a cognitive radio network testbed at the University of Colorado Boulder. It discusses current radio design advancements, including wideband capabilities ranging from 100 MHz to 7500 MHz, the use of switched filter banks, and radio architecture for optimal performance. The challenges of deploying WiMAX and LTE technologies in wide-area networks are also addressed, emphasizing the importance of spectrum planning and network integration.

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Overview of WiMAX Technology and Cognitive Radio Testbed Development at CU Boulder

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  1. Dirk GrunwaldDepartment of Computer Science University of Colorado at Boulder WiMAX Technology Overview

  2. Testbed Experience • Design and Build GENI Cognitive Radio wideband radio (≥ 100MHz) network testbed • Current radio by Peter Wolniansky • 100Mhz-7500Mhz / 40Mhz select • Switched filter bank • Superheterodyne radio with a sharp IF filter, allowing measurements as close as 5-10 MHz from strong interferers. • Soise floor is -101dBm for a 8MHz channel • Bonded to a commodity (Avnet) FPGA board, working on support for multi-FPGA systems • Up to 4 radios on one FPGA

  3. Campus Local Wireless Networks • Most campuses using 802.11 WiFi • WLAN: Short range due to limited power, design • Limited spectrum choices (2.4Ghz & 5Ghz), but a lot of spectrum (esp. in 5Ghz band) • High performance for limited ranges - 30-100meter range, 1-200mb/s • Limited quality of service (voice, video) • Limitations based on technology and regulation

  4. WiMAX & LTE: WRAN • WiMAX & LTE designed for wide area mobile wireless networks • Better network integration • Better device and user authentication, better security, fast handover • Covers 1km-30km • Goal is coverage, not capacity • Throughput depends on bandwidth (Hz) and signal quality • 10Mhz - ~25MHz down, 6MHz up

  5. WiMAX & LTE: Deployment Challenges • Wider coverage means fewer AP’s, but each AP is more important • Most LTE / WiMAX spectrum is “line of sight” – buildings get in the way • Spectrum planning tools, follow-up measurement more important • Spectrum planning tools use frequency, height & “clutter”

  6. Wide Area Network Planning • 3500 MHz 700 MHz • Lower frequencies have wider coverage at the same power • good for coverage, but less available spectrum • More coverage usually means more interference • Technologies (LTE/WiMAX) are design for specific frequencies - future wireless network standard will use “TV White Spaces”

  7. Take away: LTE is “telecom”, WiMax is “data” – moving from one to the other is more about the “backend network” than the AP’s Much of your (CIO) planning for wide-area wireless is largely independentw of underlying technology At higher frequencies, spectrum planning is very important, but the accuracy of such spectrum planning is variable

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