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Okumura model is applicable for distances of _________

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Okumura model is applicable for distances of _________

(a) 1 m to 10 m

(b) 1 km to 100 km

(c) 100 km to 1000 km

(d) 10 km to 10000 km

I have been asked this question during a job interview.

My query is from Outdoor Propagation Models topic in portion Mobile Radio Propagation: Large – Scale Path Loss of Wireless/Mobile

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Correct answer is (b) 1 km to 100 km

To explain: Okumura’s model is applicable for distances of 1 km to 100 km. It can be used for base station antenna heights ranging from 30 m to 1000 m. Okumura developed a set of curves giving the median attenuation relative to free space in an urban area.

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