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The Qualcomm standard IS-2000, known as CDMA2000, is used by several mobile phone companies, including the Globalstar network. [nb 1] The UMTS 3G mobile phone standard, which uses W-CDMA. [nb 2] CDMA has been used in the OmniTRACS satellite system for transportation logistics.
Qualcomm agreed to license its CDMA patents for variants such as WCDMA. [92] There were 240 million CDMA 3G subscribers by 2004 and 143 carriers in 67 countries by 2005. [72] Qualcomm claimed to own 38 percent of WCDMA's essential patents, whereas European GSM interests sponsored a research paper alleging Qualcomm only owned 19 percent. [67]
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 ...
In practice, 3GPP2 was the standardization group for CDMA2000, the set of 3G standards based on the earlier cdmaOne 2G CDMA technology. The participating associations were ARIB/TTC (Japan), China Communications Standards Association, Telecommunications Industry Association (North America) and Telecommunications Technology Association (South Korea).
In 3G, the most prevalent technology was UMTS with CDMA-2000 in close contention. All radio access technologies have to solve the same problems: to divide the finite RF spectrum among multiple users as efficiently as possible. GSM uses TDMA and FDMA for user and cell separation. UMTS, IS-95 and CDMA-2000 use CDMA. WiMAX and LTE use OFDM.
Multi-carrier code-division multiple access (MC-CDMA) is a multiple access scheme used in OFDM-based telecommunication systems, allowing the system to support multiple users at the same time over same frequency band. MC-CDMA spreads each user symbol in the frequency domain.
Gobi 3G (CDMA/UMTS; GSM) MSM8905 [40] Qualcomm 205 2 cores up to 1.1 GHz Cortex-A7: Adreno 304 400 MHz (19.2 GFLOPS in FP32) Hexagon 536 Up to 3 MP single camera
3G refers to the third-generation of cellular network technology. ... and CDMA2000 (developed by Qualcomm, ... W-CDMA is the most common deployment, commonly operated ...
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