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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.
CDMA service suspended starting from 31 October 2017. BSNL ... Oct 2000: Jul 2020 [145] [140] [146] CDMA2000 1xEV-DO was also referred to as "2G"
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.
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 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.
CDMA - - - - - - - [1] [332] [335] Unitel: 15 MHz, UMTS: 20 MHz Apr 2016 5 MHz, GSM - - 12,2 MHz, GSM - 10 MHz Nov 2016 - 40 MHz Jan 2017 - [1] [5] [332] [336] [337] Myanmar: ACS: N/A: N/A: N/A - N/A - - - - 20 MHz May 2018 B38 [338] [339] MPT: 5 MHz Oct 2016 10 MHz, UMTS: 20 MHz May 2017: 10 MHz, CDMA 2000 - 10 MHz, GSM - - 3,8 MHz, CDMA 2000 ...
IMT-2000 (International Mobile Telecommunications-2000) is the global standard for third generation wireless communications as defined by the International Telecommunication Union. [1] [2] [3] In 1999 ITU approved five radio interfaces for IMT-2000 as a part of the ITU-R M.1457 Recommendation. [4] The five standards are: [5] IMT-2000 CDMA ...
The frequency-division multiple access (FDMA) channel-access scheme is the most standard analog system, based on the frequency-division multiplexing (FDM) scheme, which provides different frequency bands to different data streams.