A Novel Hybrid Approach for Spectrum Sensing in Cognitive Radio [ READ ]
Veena Gawde, Dr. B. K. Mishra, Rajesh Bansode
Cognitive Radio (CR) is a technique used to improve utilization of the radio spectrum. It is a software controlled radio that senses the unused frequency spectrum at any time. Spectrum sensing in CR is challenged by a number of uncertainties, which degrade the sensing performance and in turn require much more time to achieve the targeted sensing efficiency. Reliable spectrum sensing is one of the most crucial aspects for the successful deployment of cognitive radio technology. Hybrid spectrum sensing scheme is proposed which obtains reliable results with less sensing time. First, the scheme determines better an energy detection method, or a combination of energy and matched filter based detectors based on the SNR of the signal. In the combined energy and matched filter detector, an energy detector with certain value of threshold is used, and the matched filter detector is applied only if user is not detected by energy detection method. Second, sensing is performed by dedicated sensing receiver that is with the use of multiple antennas which reduces sensing time. To evaluate the scheme’s performance, the results are compared with those where only an energy detector, matched ï¬lter are performed. The performance metrics are the probability of detection, probability of false alarm and sensing time.
Veena Gawde, Dr. B. K. Mishra, Rajesh Bansode
Cognitive Radio (CR) is a technique used to improve utilization of the radio spectrum. It is a software controlled radio that senses the unused frequency spectrum at any time. Spectrum sensing in CR is challenged by a number of uncertainties, which degrade the sensing performance and in turn require much more time to achieve the targeted sensing efficiency. Reliable spectrum sensing is one of the most crucial aspects for the successful deployment of cognitive radio technology. Hybrid spectrum sensing scheme is proposed which obtains reliable results with less sensing time. First, the scheme determines better an energy detection method, or a combination of energy and matched filter based detectors based on the SNR of the signal. In the combined energy and matched filter detector, an energy detector with certain value of threshold is used, and the matched filter detector is applied only if user is not detected by energy detection method. Second, sensing is performed by dedicated sensing receiver that is with the use of multiple antennas which reduces sensing time. To evaluate the scheme’s performance, the results are compared with those where only an energy detector, matched ï¬lter are performed. The performance metrics are the probability of detection, probability of false alarm and sensing time.
