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This is used in GSM to separate cells, which then use TDMA to separate users within the cell. Code-division multiple access (CDMA) This uses a digital modulation called spread spectrum which spreads the voice data over a very wide channel in pseudorandom fashion using a user or cell specific pseudorandom code. The receiver undoes the ...
Most 2G cellular systems, with the notable exception of IS-95, are based on TDMA. GSM, D-AMPS, PDC, iDEN, and PHS are examples of TDMA cellular systems.. In the GSM system, the synchronization of the mobile phones is achieved by sending timing advance commands from the base station which instruct the mobile phone to transmit earlier and by how much.
Samsung Galaxy Tab Pro 10.1 LTE, Samsung Galaxy Tab Pro 8.4; Samsung Galaxy Tab S 10.5 LTE, Samsung Galaxy Tab S 8.4 LTE; Surface Mini (prototype), YotaPhone 2, ZTE Grand S II LTE [242] MSM8974AA v3 (801) [243] Q3 2014 BlackBerry Passport, [244] IUNI U3, [245] Vivo Xshot Elite [246] OnePlus X (with 578 MHz GPU, Oppo A30 in China), [247] Oppo N3 ...
With the introduction of digital transmission in TDMA-based systems like GSM, CSD provided almost direct access to the underlying digital signal, allowing for higher speeds. At the same time, the speech-oriented audio compression used in GSM actually meant that data rates using a traditional modem connected to the phone would have been even ...
For example, one version of the Nokia 6340i GAIT phone sold in North America can operate on GSM-1900, GSM-850 and legacy TDMA-1900, TDMA-800, and AMPS-800, making it both multi-mode and multi-band. As a more recent example the Apple iPhone 5 and iPhone 4S support quad-band GSM at 850/900/1800/1900 MHz, quad-band UMTS/HSDPA/HSUPA at 850/900/1900 ...
CDMA2000 is a family of 3G mobile technology standards for sending voice, data, and signaling data between mobile phones and cell sites. It is a backwards-compatible successor to second-generation cdmaOne (IS-95) set of standards and used especially in North America and South Korea, China, Japan, Australia and New Zealand.
The name TDMA is based on the abbreviation for time-division multiple access, a common multiple access technique which is used in most 2G standards, including GSM, as well as in IS-54 and IS-136. D-AMPS competed against GSM and systems based on code-division multiple access (CDMA).
GSM: Global System for Mobile Communications; iDEN: Integrated Digital Enhanced Network; D-AMPS: Digital Advanced Mobile Phone System based on TDMA; cdmaOne: Code Division Multiple Access defined by IS-95; PDC: Personal Digital Cellular; TDMA: Time Division Multiple Access; 2.5G: A set of transition technologies between 2G and 3G wireless ...
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