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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.
IFAST – International Forum on ANSI-41 Standards Technology IIF – Interworking and Interoperability Function IMEI – International mobile equipment Identity IMS – IP Multimedia Subsystem IMSI – International Mobile Subscriber Identity IMSI 11 12 – Same as MNC (Mobile Network Code) IMSI S – Short IMSI, Mobile Identification Number
For the case of MC-DS-CDMA where OFDM is used as the modulation scheme, the data symbols on the individual subcarriers are spread in time by multiplying the chips on a PN code by the data symbol on the subcarrier. For example, assume the PN code chips consist of {1, −1} and the data symbol on the subcarrier is −j.
Operator Country Technology Frequency (MHz) Launch date Notes ArgoNET Austria CDMA2000 EV-DO Rev. B 450 Nov 2014: 4,44 MHz [1] [2] [3] [4] Private network for ...
The code-division multiple access (CDMA) scheme is based on spread spectrum, meaning that a wider radio channel bandwidth is used than the data rate of individual bit streams requires, and several message signals are transferred simultaneously over the same carrier frequency, utilizing different spreading codes.
CDMA2000 1X (IS-2000), also known as 1x and 1xRTT, is the core CDMA2000 wireless air interface standard.The designation "1x", meaning 1 times radio transmission technology, indicates the same radio frequency (RF) bandwidth as IS-95: a duplex pair of 1.25 MHz radio channels. 1xRTT almost doubles the capacity of IS-95 by adding 64 more traffic channels to the forward link, orthogonal to (in ...
Some advanced forms of transmission multiplexing combine frequency- and time-division approaches like OFDM or CDMA. In cellular telephone communications, the air interface is the radio-frequency portion of the circuit between the cellular phone set or wireless modem (usually portable or mobile) and the active base station.
CDMA frequency bands or frequency ranges are the cellular frequencies designated by the ITU for the operation of cdmaOne and CDMA2000 mobile phones and other mobile ...