scholarly journals A slotted ALOHA-based cognitive radio network under capture effect in Rayleigh fading channels

2016 ◽  
Vol 24 ◽  
pp. 1955-1966 ◽  
Author(s):  
Muhammed Enes BAYRAKDAR ◽  
Sedat ATMACA ◽  
Alper KARAHAN
Keyword(s):  
Cognitive Radio ◽  
Fading Channels ◽  
Rayleigh Fading ◽  
Cognitive Radio Network ◽  
Rayleigh Fading Channels ◽  
Capture Effect ◽  
Radio Network ◽  
Slotted Aloha

scholarly journals Spectrum sensing based on energy of unknown deterministic signals over fading channels

2014 ◽  
Vol 17 (1) ◽  
pp. 17-31
Author(s):  
Tu Thanh Nguyen ◽  
Khoa Le Dang ◽  
Thu Thi Hong Nguyen ◽  
Phuong Huu Nguyen
Keyword(s):  
Cognitive Radio ◽  
Fading Channels ◽  
Spectrum Sensing ◽  
Cognitive Radio Network ◽  
Signal To Noise Ratio ◽  
Energy Detection ◽  
Radio Network ◽  
Essential Components ◽  
Spectrum Hole ◽  
The Impact

In cognitive radio network, how to minimize the impact of secondary user on primary user’s signal plays a very important and complex role. Therefore, spectrum sensing is one of the most essential components of cognitive radio. Therefore, the effect of spectrum sensing algorithms plays a key role to the system’s performance. In this paper, we concentrate on spectrum sensing algorithms in order to find out spectrum hole or while hole for reusing it. Specifically, we will highlight the energy detector algorithm of unknown deterministic signals over fading channels. The numerical results match well with theoretical analysis. The system’s performance of energy detection in AWGN channel is acceptable in case of relatively low signal to noise ratio (SNR). However, the performance of system will be degraded remarkable over fading environments.

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