Abstract
ABSTRACTSpectrum sensing is one of the main functionalities of cognitive radios to find transmission opportunities without interfering primary users’ transmission. The more accurate and efficient the spectrum sensing is, the higher the throughput of secondary and primary networks is achieved. This paper presents adaptive spectrum sensing method based on phase-type modelling that is computationally efficient for secondary users to conclude about the channel state (idle or busy) under collision constraint. The parameters of phase-type model can be adjusted based on the desired operating point of the receiver sensor in its receiver operating characteristic (ROC) curve. The presented approach can run a simple trade-off between sensing time and the two error probabilities of the receiver sensor, i.e. false-alarm and miss-detection, the trade-off that cannot be easily achieved in other sensing method.
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