Question

Which among the following is a common problem incorporated by a channel on cognitive radios?

(a) Switching delay

(b) Transmitter uncertainty

(c) Doppler shift

(d) Receiver uncertainty

This question was addressed to me in unit test.

Question is from Next Generation Wireless Network topic in division Next Generation Wireless Network of Cognitive Radio

Answer 1

The correct choice is (c) Doppler shift

For explanation I would say: The major degradation introduced by channels on cognitive radio is shadowing, fading, and Doppler shift. Predictive models constructed using short term and long term observations with radio environment map increase awareness of channels. This helps in developing better plans to tackle the effect of channel degradation.