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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 in an opportunistic manner. 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 single antenna. Numerical results show that proposed scheme having 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 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 sensing failure problem.

Multiple Energy detectors Based Cognitive Radio Networks Using Adaptive Double-Threshold scheme