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Code-division multiple access ( CDMA) is a channel access method used by various radio communication technologies. CDMA is an example of multiple access, where several transmitters can send information simultaneously over a single communication channel. This allows several users to share a band of frequencies (see bandwidth ).
No new applications for CDMA service were accepted after 7 Nov 2018. Voice data via IP over the CDMA2000 1x EV-DO network. Interdnestrcom Moldova: CDMA2000 1xRTT 450 / 800 ? Sep 2020 (450) / Aug 2023 (800) [123] [124] [125] Coverage only in Transnistria. Telecom Namibia Namibia: CDMA2000 1xRTT, EV-DO Rel. 0 450 / 800 Nov 2006: Apr 2015 [126] [127]
GSM uses TDMA and FDMA for user and cell separation. UMTS, IS-95 and CDMA-2000 use CDMA. WiMAX and LTE use OFDM . Time-division multiple access (TDMA) provides multiuser access by chopping up the channel into sequential time slices. Each user of the channel takes turns to transmit and receive signals.
CDMA2000. CDMA2000 (also known as C2K or IMT Multi‑Carrier ( IMT‑MC )) is a family of 3G [1] mobile technology standards for sending voice, data, and signaling data between mobile phones and cell sites. It is developed by 3GPP2 as a backwards-compatible successor to second-generation cdmaOne (IS-95) set of standards and used especially in ...
The proprietary name for IS-95 is cdmaOne . It is a 2G mobile telecommunications standard that uses CDMA, a multiple access scheme for digital radio, to send voice, data and signaling data (such as a dialed telephone number) between mobile telephones and cell sites. CDMA transmits streams of bits ( PN codes ).
Qualcomm further developed the CDMA techniques for commercial use and submitted them to the Cellular Telephone Industries Association (CTIA) in 1989 as an alternative to the time-division multiple access (TDMA) standard for second-generation cell-phone networks.
Mobile phones containing two types of cellular radios for voice and data. These phones include combination of GSM and CDMA technology. They can be used as a GSM or CDMA phone according to the user's preference. These handsets are also called global phones. An example of this is the Samsung SCH-A790. These dual-mode handsets are compatible with ...
A selection of mobile phones that can be cloned. Code-Division Multiple Access (CDMA) mobile telephone cloning involves gaining access to the device's embedded file system /nvm/num directory via specialized software or placing a modified EEPROM into the target mobile telephone, allowing the Electronic Serial Number (ESN) and/or Mobile Equipment Identifier (MEID) of the mobile phone to be changed.
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