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Which of the following technology does not use MIMO?

(a) 4G

(b) Wifi

(c) WiMax

(d) AMPS

I have been asked this question in an internship interview.

My question is based upon Multiple Input Multiple Output (MIMO) topic in portion 4G of Wireless/Mobile

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Correct option is (d) AMPS

Easy explanation: MIMO is used in mobile radio telephone standards such as recent 3GPP and 3GPP2. In 3GPP, High-Speed Packet Access plus (HSPA+) and Long Term Evolution (LTE) standards take MIMO into account. Moreover, MIMO is also used in Wifi and WiMax.

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