Q. Heterogeneous cognitive radio is a ____ centric approach.

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Q. In ____, radio access technologies use the same frequency band.

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Q. Global Positioning System uses ____ to determine geo-location of receiver.

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Q. GPS receivers include a signal that is ____ filtered when it reaches a radio from a satellite.

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Q. Kalman filter estimates ____

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Q. GPS requires at least ___ satellites in view of the receiver.

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Q. ____ aids in the exploitation of unused channels.

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Q. ____ proposes the presence of secondary users for improved spectral efficiency.

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Q. ____ gives available and unavailable spectrum frequency.

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Q. The secondary user intentionally senses surrounding environment in ____

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Q. ____ involve the measurement of distinctive features to label and describe individuals.

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Q. Which among the following is not a behavioural biometric identifier?

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Q. Which among the following is not a characteristic of biometric?

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Q. During ____, the biometric of an individual is captured and stored.

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Q. The first step in verification mode is to ____ users.

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Q. Triangulation may be used for geo-location.

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Q. Spectrum awareness prevents hidden node problem.

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Q. Which among the following does not have significant use for time of day information?

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Q. ____ in a radio system can be used to keep track of time of the day.

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Q. Atomic clocks have a stability of ____

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