Cognitive radio

  • Authors:

  • Shilpa Achaliya

  • Affiliations:

  • Electronics and Telecommunication, Mumbai University, Ramrao Adik Institute of Technology, Navi Mumbai, India

  • Venue:
  • EHAC'10 Proceedings of the 9th WSEAS international conference on Electronics, hardware, wireless and optical communications
  • Year:
  • 2010

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Abstract

The radio frequency spectrum is a scarce natural resource and its efficient use is of the utmost importance. The spectrum bands are usually licensed to certain services, such as mobile, fixed, broadcast, and satellite, to avoid harmful interference between different networks to affect users. Most spectrum bands are allocated to certain services but worldwide spectrum occupancy measurements show that only portions of the spectrum band are fully used. Moreover, there are large temporal and spatial variations in the spectrum occupancy. In the development of future wireless systems the spectrum utilization functionalities will play a key role due to the scarcity of unallocated spectrum. Moreover, the trend in wireless communication systems is going from fully centralized systems into the direction of self organizing systems where individual nodes can instantaneously establish ad hoc networks whose structure is changing over time. Cognitive radios, with the capabilities to sense the operating environment, learn and adapt in real time according to environment creating a form of mesh network, are seen as a promising technology. Cognitive radio is a new technology that allows spectrum to be dynamically shared between users.