Abstract
We consider a cognitive radio network that makes access to spectrum licensed to the primary user. In this network, the secondary user will be allowed to use the idle frequency channel of the primary user. It’s primarily depending on the proper spectrum sensing. If the channel is seems to be idle the secondary user can occupy the channel but whenever the primary user returns to their frequency channel they have to either switch to the other idle channel or they can wait still on the same channel till it free. In this paper we are considering a cognitive network with one primary user and a secondary user. Secondary user (SU) accessing multiple channels via periodic sensing and spectrum handoff. In our design Implementation is done by utilizing the concept of energy detection algorithm on specific transceiver model of 802.15.4/Zigbee based on Arduino board by analysis of RSSI values of Zigbee devices according to the distance. Also include analyzing of the sensing duration and finding appropriate threshold value for sensing based on Zigbee modems. Energy efficient design is being implemented by utilizing sleeping mode of the Zigbee devices.
Highlights
The Electromagnetic Radio Spectrum, a natural resource, is currently licensed by regulatory bodies for various applications
While switching to the idle channel the secondary user is allowed to sense whether the primary user returned if so the secondary user have to switch to the another available channel in the ISM 2.4GHz band
We evaluate the values obtained from the received signal strength indication (RSSI) pin of the Xbee module and the RSSI value obtained from the AT command ATDB
Summary
The Electromagnetic Radio Spectrum, a natural resource, is currently licensed by regulatory bodies for various applications. Recent studies of Federal communications commission show that 70% of the channels are occupied in US and found that 90 percentage of the time licensed frequency bands remain unused [1]. To solve this scenario of the spectrum shortage, the concept of Cognitive radio is implemented. Channel sharing is facilitated through periodic sensing [4] For some system, their energy is critical in that cases it’s not suitable to handoff frequently and some time the secondary user choose to wait one the same channel and stop transmission at the cost of increased delay and reduced average throughput [5].
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callMore From: International Journal of Online and Biomedical Engineering (iJOE)
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
