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Who invented the technology CDMA?

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Who invented the technology CDMA?

(a) Qualcomm

(b) Bell Labs

(c) SAP Labs

(d) AT&T

This question was addressed to me in an internship interview.

The above asked question is from Bandwidth Requirement for PAM Transition in division Phase Locked Loop & Pulse Modulation of Analog Communications

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Correct option is (a) Qualcomm

Easiest explanation: CDMA stands for Code Division Multiple Access. CDMA was invented by Qualcomm. CDMA is a channel access method used by various radio communication technologies. It is a kind of multiplexing where various signals uses the same transmission channel in a more optimized way.

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