COGNITIVE RADIO
•Cognitive
radio (CR) is a form of wireless
communication in which a transceiver can intelligently
detect which communication channels are in use and which are not, and instantly
move into vacant channels while avoiding occupied ones.
•
This optimizes the use of available radio-frequency (RF) spectrum while
minimizing interference to other users.
•In
its most basic form, Cognitive Radio is
a hybrid technology involving software defined radio (SDR) as applied to spread
spectrum
communications.
•Possible functions of cognitive radio include the
ability of a transceiver to determine its geographic location, identify and
authorize its user, encrypt or decrypt signals, sense neighboring wireless
devices in operation, and adjust output power and modulation characteristics.
There are two main
types of cognitive radio:-
•Full cognitive radio
•Spectrum-sensing cognitive radio.
•Full
cognitive radio takes into account
all parameters that a wireless node or network can be aware of.
•Spectrum-sensing
cognitive radio
is used to detect channels in the radio frequency spectrum.
• It is a
radio which autonomously detects and exploits empty spectrum to increase file transfer rate.
•This
same radio could remember the locations
where your calls tend to drop and arrange for your call to be serviced by a
different carrier for those locations.
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