Question

Which among the following method is employed in underlay spectrum sharing?

a.

Time division multiple access

b.

Spread spectrum techniques

c.

Frequency division multiple access

d.

Time division duplexing

Posted under Cognitive Radio

Answer: (b).Spread spectrum techniques Explanation:Underlay spectrum sharing technique employs spread spectrum techniques while transmitting in the licensed portion of the spectrum band. Spread spectrum involves stretching a signal over a bandwidth which is wider than its original bandwidth. Therefore bandwidth utilization and interference towards the primary user is increased.

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Q. Which among the following method is employed in underlay spectrum sharing?

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