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Which among the following is a parameter for Cramer-Rao lower bound?

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Which among the following is a parameter for Cramer-Rao lower bound?

(a) Decision theory

(b) Bayesian statistics

(c) Wald test

(d) Fisher information

This question was addressed to me in semester exam.

This interesting question is from Environment Awareness in chapter Location and Environment Awareness in Cognitive Radio of Cognitive Radio

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Right answer is (d) Fisher information

Easy explanation: Cramer Rao lower bound states the variance of any unbiased estimator is at least as high as the inverse of Fisher information. It may be employed as an optimization criterion in bat echolocation systems.

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