Multiple Energy detectors Based Cognitive Radio Networks Using Adaptive Double-Threshold scheme
Jun Hee Lee, Ashish Bagwari, Geetam Singh Tomar · International Journal of Smart Business and Technology · 2013
Cognitive radio is an enabling technology to solve the spectrum scarcity problem in wireless communication.Spectrum sensing is one of the most important functions in Cognitive Radio (CR) implementation & use to sense the unused spectrum opportunistically.In this paper, we propose Multiple Energy Detectors (MED) utilizing Adaptive Double-Threshold (ADT) for spectrum sensing.In the present framework of CR networks, each CR node is equipped with MED and each energy detector with a single antenna.Numerical results show that the proposed scheme having the number of antennas (Nr) = 3 outperforms conventional energy detector by 8.3 % at -8 dB Signal to Noise Ratio (SNR) in terms of probability of detection alarm.When the number of energy detectors (M) = 3, the signal detects at a very low signal to noise ratio (SNR) i.e. -9 dB.Therefore, as the number of energy detectors (M) increases, the detection performance improves and overcomes the sensing failure problem.