Spectrum Measurements for IEEE 802.22 Wireless Regional Area Networks

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  • 1. By: MUHAMMAD FARRUKH YAQUB LECTURER DEPARTMENT OF ELECTRICAL ENGINEERING., UNIVERSITY OF ENGINEERING AND TECHNOLOGY, LAHORE
  • 2. Layout Back Ground   IEEE 802.22 Standard  Primary Vs Secondary Network  Cognitive Radio (As an example)  Spectrum Measurements  Conclusions and Further Work
  • 3. Background Fixed Spectrum Policy.  The limited availability  and inefficient usage creates the room to use the wireless spectrum opportunistically. NeXt Generation (xG)  Networks, Dynamic Spectrum Access (DSA) and cognitive radio networks.
  • 4. IEEE 802.22 WRAN The IEEE 802.22 Working Group was formed in November 2004 with the task of  developing a standard for wireless regional area network (WRAN) based on cognitive radio technology. This project, called the standard for wireless regional area networks (WRAN), efficient  utilization of UHF/VHF TV bands between 54 and 862 MHz. The operating principle is to make unlicensed access to  unused or under-utilized TV spectrum.
  • 5. Features(IEEE 802.22) Base-station coverage range 100 km if the  power is not an issue. Sense the spectrum.  Identify unused TV Spectrum.  Utilize this Spectrum.  No harmful interference is caused to the  licensed users.
  • 6. Primary Vs Secondary Network Primary Network: An existing network infrastructure is generally referred to as the primary network. For example TV broadcast networks. The components of the primary network are primary user and primary base-station. They have license of the spectrum so they don’t need to incorporate any extra functionality to support secondary network. Secondary Network: Secondary network (or cognitive radio network, Dynamic Spectrum Access network, xG network, unlicensed network) does not have license to operate in a desired band. Hence, the spectrum access is allowed only in an opportunistic manner. The components of secondary spectrum are secondary user and secondary base-station. They are unlicensed users and have to incorporate extra functionality to efficient utilize the spectrum without causing interference or degradation to the primary(licensed) network.
  • 7. xG/Secondary Network Architecture
  • 8. Cognitive Radio Technology A ‘‘Cognitive Radio’’ is a radio that can  change its transmitter parameters based on interaction with the environment in which it operates. Cognitive radio techniques provide the  capability to use or share the spectrum in an opportunistic manner. Cognitive Radio can be called as an  intelligent software defined radio(SDR). The block diagram for SDR is given by: ANTENNA Processing at the LNA ADC Software level
  • 9. Related Characteristics of CR Cognitive capability: Cognitive 1. capability refers to the ability of the radio technology to capture or sense the information from its radio environment. Spectrum sensing: A cognitive radio a. monitors the available spectrum bands, captures their information, and then detects the spectrum holes . Spectrum analysis: The b. characteristics of the spectrum holes that are detected through spectrum sensing are estimated. Spectrum decision: A cognitive radio c. determines the data rate, the transmission mode, and the bandwidth of the transmission. Then, the appropriate spectrum band is chosen according to the spectrum characteristics and user requirements.
  • 10. Spectrum measurements (120-200MHz)
  • 11. Spectrum measurements (200-300MHz)
  • 12. Spectrum measurements (300-600MHz)
  • 13. Conclusions and Further work Availability of the unused spectrum.   Spatial and Temporal model to avoid interference with the primary user.  Dynamic Spectrum Sharing.  Quality of Service.
  • 14. Thank you very much.