Which among the following is not a challenge for spectrum sensing?(a) Continuous sensing of spectrum(b) Energy consumption(c) Switching between sensing and transmission(d) Limit sensing when a single radio is deployedI had been asked this question in an interview.Question is from Next Generation Wireless Network in section Next Generation Wireless Network of Cognitive Radio

Which among the following is not a challenge for spectrum sensing?(a)

1.	Which among the following is not a challenge for spectrum sensing?(a) Continuous sensing of spectrum(b) Energy consumption(c) Switching between sensing and transmission(d) Limit sensing when a single radio is deployedI had been asked this question in an interview.Question is from Next Generation Wireless Network in section Next Generation Wireless Network of Cognitive Radio
Answer» The correct answer is (d) Limit sensing when a single RADIO is deployed The best I can explain: Radio cannot sense the entire available spectrum CONTINUOUSLY. An UPPER limit is established on energy consumption for a period of time. Thus ACCURATE spectrum knowledge is unavailable at all times. Cross-layer interaction is required for switching between transmissions and sensing operations during in-band sensing OPERATION.

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