Many spectrum sensing algorithms have been proposed for cognitive radio, such as energy detection, pilot-based coherent detection, covariance-based detection, and cyclostationary detection [3, 4].
A practicality issue about noncoherent detection is pilot insertion.
Suppose that we estimate channels for coherent detection with pilot sets K p 1, K p 2, …, K p N t.
She said vent-free fireplaces are safe primarily because they are fitted with an oxygen detection safety-pilot, or O.D.S.
The proposed CPAI system implementation is based on real-time detection of the pilot's physiological and cognitive states, allowing the avoidance of pilot errors and supporting enhanced synergies between the human and the avionics systems.
Several blind and signal-specific feature-based techniques have been proposed to perform sensing: spectral correlation, time-domain cyclostationarity, eigenvalue decomposition, pilot detection, higher order statistics analysis [27].
Two parameters influence the waiting time for pilot detection and measurements, namely the pilot symbols transmission period (L), and their transmission duration (N).
It was shown that PF-TX might detect a conflict even before ATCo-R which could lead to an accident if detection by the pilot is too late (e.g. Figure 9).
Over various conditions, the average distance at which detection by the pilot occurred ("detection distance") was from 5.5 to 8.7 km.
With the proposed scheme, a CR user carrying out PU detection first removes the pilot signal from the signal received on the pilot subcarriers (i.e., is removed from ) and then makes a decision on the existence of PU.
The detection office has a pilot project called the Securing the Cities Initiative, which is testing techniques of detecting fissile material, at land or sea, within 45 miles of New York City.
