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Secondary User (SU) has a responsibility to seek opportunities of spectrum access through spectrum sensing continuously. Spectrum sensing is a main task in Cognitive Radio (CR) that must be performed to avoid collision with Primary User (PU) and having seamlessly data transmission via license channel. To achieve sensing outcome correctly with tolerable error rate, SU requires sufficient time for sensing...
The required time for spectrum sensing is critical issue in cognitive radio (CR). Secondary User (SU) must sense license spectrum to seek opportunities as quick as possible. However, quick sensing decreases the fidelity of sensing outcome. Sensing time has a significant impact to the throughput performance. This paper studies the impact of sensing time to the throughput performance at low signal to...
This paper investigates a signal processing architecture for cognitive radio based on a sub-Nyquist sampling of the wideband signal. Then spectrum scanning is performed by applying an adaptive digital filter to scan the bands which might be used for cognitive radio. In particular, the paper studies detectors which are tailored for the applied signal processing scheme and which takes into account the...
Cognitive radio today is considered to be the solution to solving the problem of spectrum scarcity. One of the most important features of cognitive radio is spectrum sensing. In spectrum sensing it is sometimes necessary to operate in a low SNR regime, in which the performance of most of the classical detectors decreases, especially when they have to deal with imprecise knowledge of the noise characteristics...
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