Question

____ gives available and unavailable spectrum frequency.

(a) Unlicensed user pattern

(b) Spectrum use pattern

(c) Licensed space pattern

(d) Licensed user pattern

This question was addressed to me in an international level competition.

The question is from Available Technologies for Cognitive Radio in section Cognitive Radio Basics of Cognitive Radio

Answer 1

The correct answer is:

(b) Spectrum use pattern

Explanation: A spectrum use pattern provides information on which frequency bands are currently in use (occupied) and which are available (unoccupied). This information is crucial for cognitive radios to dynamically adjust their operating frequencies to avoid interference with licensed users while exploiting unused spectrum (also known as white spaces).

• Unlicensed user pattern refers to the usage pattern of users operating in unlicensed bands, but it doesn't necessarily provide comprehensive information on available/unavailable spectrum frequencies.
• Licensed space pattern could refer to the specific geographical areas where licensed frequencies are used, but it doesn’t directly describe the availability of spectrum.
• Licensed user pattern refers to the pattern of usage by licensed users, which is not necessarily about identifying available and unavailable frequencies across the spectrum.

Thus, spectrum use pattern is the term that directly relates to identifying the availability and unavailability of spectrum frequencies for use by cognitive radios.