Editing CdmaOne (section)

{{Short description|First CDMA-based digital cellular technology}}
{{About|the mobile phone technology |the channel access method|Code-division multiple access}}
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{{refimprove|date=August 2022}}
{{Technical|date=April 2011}}
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[[File:Samsung CDMA Phone.jpg|thumb|Samsung cdmaOne [[mobile phone]] disassembled]]

'''cdmaOne''', most often simply referred to as '''CDMA''', is a [[2G]] digital cellular technology. It was the commercial name for '''Interim Standard 95''' ('''IS-95'''), a technology that was developed by [[Qualcomm]] and later adopted as a standard by the [[Telecommunications Industry Association]] in TIA/EIA/IS-95 release published in 1995. 

cdmaOne used [[code-division multiple access]] (CDMA), a [[multiple access]] scheme for [[digital radio]], to send voice, data and signaling data (such as a dialed telephone number) between mobile [[telephone|telephones]] and [[cellular phone|cell sites]]. CDMA transmits streams of [[bit|bits]] ([[pseudorandom noise|PN codes]]). CDMA permits several radios to share the same frequencies. Unlike [[time-division multiple access]] (TDMA), a competing system used in 2G [[GSM]], all radios can be active all the time, because network capacity does not directly limit the number of active radios.  Since larger numbers of phones can be served by smaller numbers of cell-sites, CDMA-based standards have a significant economic advantage over TDMA-based standards,{{cn|date=May 2015}} or the oldest cellular standards that used [[frequency-division multiplexing]].

In North America, the technology competed with [[Digital AMPS]] (IS-136, most often simply called "TDMA"), a TDMA-based standard, as well as with the TDMA-based GSM.  It was supplanted by [[IS-2000]] (CDMA2000), a later CDMA-based standard.