cognitive radio
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2012-12-16
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Cognitive radio
From Wikipedia, the free encyclopedia
Acognitive radiois atransceiverwhich automatically detects available channels in wireless
spectrum and accordingly changes itstransmissionorreception parameters so morewireless
communicationsmay run concurrently in a given spectrum band at a place. This process is also
known asdynamic spectrum management. A cognitive radio, as defined by the researchers
atVirginia Polytechnic Institute and State University, is "a software defined radio with a cognitive
engine brain".
[1]
Contents
[hide]
1Description
2History
3Terminology
4Technology
o 4.1Functions
o 4.2Cognitive radio (CR) versus intelligent antenna (IA)
5Applications
6Future plans
7See also
8References
9External links
[edit]Description
In response to the operator's commands, the cognitive engine is capable of configuring radio-
system parameters. These parameters include "waveform, protocol, operating frequency, and
networking".
[2]
It functions as an autonomous unit in the communications environment, exchanging
information about the environment with the networks it accesses and other CRs.
[2]
A CR "monitors
its own performance continuously", in addition to "reading the radio's outputs"; it then uses this
information to "determine theRFenvironment, channel conditions, link performance, etc.", and
adjusts the "radio's settings to deliver the required quality of service subject to an appropriate
combination of user requirements, operational limitations, and regulatory constraints". These
processes have been described as "reading the radio's meters and turning the radio's knobs".
[1]
[edit]History
The concept ofcognitiveradio was first proposed by Joseph Mitola III in a seminar atKTH(the
Royal Institute of Technology in Stockholm) in 1998 and published in an article by Mitola and
Gerald Q. Maguire, Jr. in 1999.
[3]
It was a novel approach in wireless communications, which
Mitola later described as:
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