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Background: I present the state of the art of the spectrum sensing technique for

April 11, 2024

Background: I present the state of the art of the spectrum sensing technique for
cognitive radio networks as well as comparisons. Spectrum scarcity is a problem
in data communication system. To address this issue, various spectrum sensing
techniques have been discussed to make use of idle bands in the spectrum. Owing
to the adaptability of cognitive radio with regards to changes in spectrum band
availability, better spectrum utilization may be achieved.
Methods: I highlight the open issues and challenges associated with spectrum
sensing to facilitate more productive research and present their comparison in
terms of various performance parameters. A proposed method is issued named:
Optimum sensing time method. I report the spectrum occupancy measurement for
cognitive radio purpose in Bangladesh.
Findings: I can observe that most of the frequency spectrum remains unoccupied
in Bangladesh. Only small fraction seems to be active. From a little visual
inspection it is found that active parts are in FM radio (87.5-108 MHz), VHF TV
(174-230 MHz), GSM 900 (880-960 MHz), GSM 1800 (1710-1880 MHz), and
4G (1885-2200 MHz) areas. Rest of the spectrum between 0-3 GHz is mostly
unoccupied. It is clear from the plot the occupancy is not same in uplink and
downlink. So 81% is unoccupied and can be used in cognitive radio purposes.
Conclusion: This paper has presented an investigation of white spaces
availability for opportunistic spectrum access in cognitive radio purpose in
Bangladesh. Detection of unused band is essential for an efficient use of spectral
resources. Hence, this paper can provide useful information for the regulatory
body to consider opportunistic spectrum access which can bring both economic
and social impact to the country.   

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