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Chapter 13

keely avatar
keely
15 diapositives · 379 Views · Aug 21, 2014

Chapter 13. Defining Cognitive Radio. Outline. Historical perspective on the development of cognitive radio concept Comparison of different views on cognitive radio Definitions of concepts related to cognitive radio

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Chapter 13
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  1. Chapter 13 Defining Cognitive Radio

  2. Outline • Historical perspective on the development of cognitive radio concept • Comparison of different views on cognitive radio • Definitions of concepts related to cognitive radio • Detailed overview of standardization activities on cognitive radio with an emphasis on IEEE SCC41

  3. Popularity of cognitive radio • Can you find out what are these numbers now?

  4. History • Maritime communication developed in early 1920s. • FCC allowed (1960) shared channels in land mobile communication with LBT. • CB: FCC allowed (1970s) shared channels at 27MHz band. • FCC Rule Part 15 (1985 approved), described the ways of coexistence of low power wireless devices in Industrial, Scientific and Medical (ISM) band.

  5. Depicting the history of cognitive radio

  6. Future ? • Intelligent systems. • Higher computational capability. • More flexibility. • Harvesting more and more radio spectrum (reusing them temporally and spatially). • Digital dividend. • More standards to come.

  7. Definitions(1) • Mitola: “wireless personal digital assistants and the related networks were sufficiently computationally intelligent about radio resources, … to detect user needs as a function of use context, and to provide radio resources and wireless services most appropriate to those needs" How a SDR can become a CR with this definition?

  8. Definitions(2) • Haykin: “inclusive of SDR, [idea] to promote efficient use of spectrum by exploiting the existence of spectrum holes“ OR • “intelligent wireless communication system (...) that adapt(s) to statistical variations in the input stimuli … which are highly reliable communication (...); efficient utilization of radio spectrum." An efficient (re)use of spectrum is in itself CR ?

  9. Comparison of various terms related to CR Is this table complete? Are there more terms?

  10. Cognitive radio: IEEE SCC41

  11. Classification of definitions

  12. Adaptable Radio devices and their characteristics

  13. Relationship between various standards

  14. Open issues • Regulatory • Test Procedures • Protocols • Interoperability • Coexistence and cooperation • Medium Access Control • Security

  15. Chapter 13 Summary • Cognitive radio is a notion with multiple, very often contradictory definitions • Many independent standardization bodies are working on cognitive radio (IEEE, ITU, ETSI, …)