cognitive radio in a frequency planned environment can it work erik axell
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Cognitive Radio in a Frequency-Planned Environment: Can it Work? Erik Axell. Erik G. Larsson and Mikael Skoglund, IEEE GLOBECOM, 2007. SENDORA – SEnsor Network for Dynamic and cOgnitive Radio Access. Linköping University THALES Communications Institut Eurocom Kungliga Tekniska Högskolan

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cognitive radio in a frequency planned environment can it work erik axell

Cognitive Radio in a Frequency-Planned Environment: Can it Work?Erik Axell

Erik G. Larsson and Mikael Skoglund, IEEE GLOBECOM, 2007

sendora sensor network for dynamic and cognitive radio access
SENDORA – SEnsor Network for Dynamic and cOgnitive Radio Access
  • Linköping University
  • THALES Communications
  • Institut Eurocom
  • Kungliga Tekniska Högskolan
  • Helsinki University of Technology
  • Norwegian University of Science and Technology
  • Telenor ASA
  • Universitat de València
  • Università degli Studi di Roma
some fundamental questions
Some Fundamental Questions
  • Cognitive radios must transmit at very low power. How low must it be?
  • Cognitive radios must expect very low C/(I+N) from primary system. What orders of magnitude?
  • At an acceptable loss in primary system coverage, how large is the “area of cognitive operation”?
basic assumptions and some terminology
Basic Assumptions and Some Terminology
  • Path loss and lognormal fading
  • n-reuse frequency planning for primary system
  • SINR for primary system, with primary base station power P0
  •  -SINR is the SINR achieved with probability 1-
primary system operating point
Primary System Operating Point
  • Primary system is either noise limited, interference limited, or in-between. Quantify this in terms of ratio between noise and co-channel interference at the primary cell border:
    •  - [dB]: purely noise limited
    •   [dB]: purely interference limited
with cognitive users
With Cognitive Users
  • SINR is now
  • Suppose we can accept reduction in primary cell radius from r to r’. Then assume M cognitive users, each with power P, uniformly distributed in circular ring. How large can the circular ring, the ”area of cognitive operation,” be?
asymptotic sensitivity requirements
Asymptotic Sensitivity Requirements
  • The additional (compared to primary receivers) sensitivity requirement  isand satisfies
main conclusions
Main Conclusions
  • If cognitive users are to be introduced, they must
    • Be few in numbers, since the aggregate power scales with the number of devices
    • Transmit with extremely low power, such as -30 dB below the primary system
    • Have very sensitive radios, in the order of 20-30 dB more sensitive than the primary system radios.
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