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Which among on the following transceiver parameter may be used to improve range accuracy adaption?

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Which among on the following transceiver parameter may be used to improve range accuracy adaption?

(a) Randomizing transmit power level

(b) Decreasing the length of observation symbols

(c) Increasing the length of observation symbols

(d) Randomizing carrier frequencies

This question was posed to me at a job interview.

The above asked question is from Environment Awareness topic in section Location and Environment Awareness in Cognitive Radio of Cognitive Radio

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The correct answer is (c) Increasing the length of observation symbols

For explanation: The length of observation symbols is a transceiver parameter that affects range accuracy. Range accuracy improves by increasing the length of the observation symbols. However this introduces difficulties such as large overhead.

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