Search results
Results from the WOW.Com Content Network
[clarification needed] The technology of CDMA was used in 1957, when the young military radio engineer Leonid Kupriyanovich in Moscow made an experimental model of a wearable automatic mobile phone, called LK-1 by him, with a base station. [8] LK-1 has a weight of 3 kg, 20–30 km operating distance, and 20–30 hours of battery life.
CDMA service suspended starting from 31 October 2017. BSNL India: CDMA2000 1xRTT, EV-DO Rev. A 800 Mar 2005: Mar 2016 [73] [74] [75] MTS India: CDMA2000 1xRTT, EV-DO Rev. B 800 Sep 2003: Nov 2017 [76] [77] [78] RCOM India: CDMA2000 1xRTT, EV-DO Rev. A 800 May 2003: Jun 2016 [79] [80] Tata Docomo India: CDMA2000 1xRTT, EV-DO Rev. B 800 Nov 2002 ...
In CDMA or QDMA, a new user is simply allocated a new code and is ready to go. It may impose a slight load on the spectrum, but the system is so devised as to absorb a controlled measure of collisions and continue operations at a high level of quality of service.
UTRA-TDD (Time Division Duplex), on the other hand, combines CDMA with TDMA and TDD. In this scheme, the same frequency band is used for both uplink and downlink, but at different times. This time-based separation is particularly advantageous in scenarios with asymmetric traffic loads, where the data rates for uplink and downlink differ ...
This page was last edited on 4 November 2023, at 10:12 (UTC).; Text is available under the Creative Commons Attribution-ShareAlike 4.0 License; additional terms may apply.
From an initialism: This is a redirect from an initialism to a related topic, such as the expansion of the initialism.. Use {{R from acronym}} instead for abbreviations that are pronounced as words, such as NATO and RADAR.
In digital communications, a chip is a pulse of a direct-sequence spread spectrum (DSSS) code, such as a pseudo-random noise (PN) code sequence used in direct-sequence code-division multiple access (CDMA) channel access techniques.
A CDMA subscriber identity module (CSIM) is an application to support CDMA2000 phones that runs on a UICC, with a file structure derived from the R-UIM card. By porting the application to the UICC (Universal Integrated Circuit Card), a card with CSIM, SIM , and USIM can operate with all major cellular technologies worldwide.