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ABSTRACT
There are many studies in cognitive radio networks to find the best transmission time for secondary users (SUs) to maximize transmission or energy efficiency. Increasing sensing duration leads to higher sensing accuracy and less interference. However, it decreases SUs' transmission time and increases energy consumptions for spectrum sensing. Conversely, longer transmission duration results in more opportunities for SUs to access the channel and reasonably higher interference with primary user (PU) due to the higher probability of PU returns. This paper presents an analytical framework based on the renewal process for SU spectrum access. Next, the amount of the interference between PU and SU that is due to the PU returns is derived analytically. The probability of the collision and the transmission efficiency are formulated to obtain the optimum transmission time.
ACKNOWLEDGEMENTS
This study was supported by Islamic Azad University, Borujerd Branch, Iran. The authors would like to acknowledge the staff of the university.
Additional information
Notes on contributors
Mohammadreza Amini
Mohammadreza Amini was born in 1981. He is an Iranian telecommunication researcher. He is an academic member of Islamic Azad University, Borujerd Branch, Iran. Email: [email protected]
Farzad Hemati
Farzad Hemati was born in 1983. He is an Iranian computer science researcher. He is an academic member of Islamic Azad University, Borujerd Branch, Iran. Email: [email protected]
Asra Mirzavandi
Asra Mirzavandi was born in 1989. She is an Iranian telecommunication and electronics researcher. She is a student member of Islamic Azad University, Yazd Branch, Iran. Email: [email protected]