What is CRT?
CRT is an intelligent
radio technology which will detect unused spectrums/channels in the current
spectrum range. It’s an exciting and new way of thinking and researching about
wireless technologies.
Why CRT is important?
Example when you take FM radio spectrum, only some
channels such as 93.4MHz or 99.8MHz is used, all other frequency range is
unused. These frequency channels can be used for transmission. The unused
spectrum is mentioned as “Spectrum Holes”.
In this technology transceiver
works as a smart/intelligent device which detects what spectrum are in use and
what spectrum is not in use. This optimizes the use of available
radio-frequency (RF) spectrum. It’s a radio that can change its
transmitter parameters based on interaction with the environment in which it
operates. If some spectrum is not used, CRT enables to use that spectrum
efficiently.
There are two main types
of cognitive radio, full cognitive radio and spectrum-sensing cognitive radio.
Full cognitive radio considers 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.
Below mentioned are the
functions of cognitive radio.
These are four main steps
in CRT i.e. Spectrum sensing, Spectrum management, Spectrum mobility and Spectrum
sharing.
Thank you for reading this article, I will be sharing more
information on CRT in upcoming articles.
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