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Which among the following factors affect the error rate?

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Which among the following factors affect the error rate?

(a) Encoding techniques

(b) Modulation scheme

(c) Channel capacity

(d) Access techniques

The question was posed to me in a job interview.

This question is from Next Generation Wireless Network topic in portion Next Generation Wireless Network of Cognitive Radio

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Best answer
The correct answer is (b) Modulation scheme

The best explanation: Wireless link errors are parameters of importance in characterizing the spectrum band. The modulation scheme and the amount of interference in the spectrum band influence the error rate. Wrongful sensing decisions are also a contributing factor to the high error rate.

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