Advanced Technology

In: Computers and Technology

Submitted By ashley01
Words 919
Pages 4
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2G, 3G and 4G TECHNOLOGY
2G Technology 2G refers to second generation wireless telecommunication technology. While its predecessor, 1G, made use of analog radio signals, 2G uses digital radio signals. Based on what type of multiplexing is employed, 2G technologies may be categorized by whether they are based on time division multiple access (TDMA) or code division multiple access (CDMA). Code division multiple access is a digital radio system that transmits streams of bits (PN Sequences). It permits several radios to share the same frequencies. Unlike time division multiple access, all radios can be active all the time, because network capacity does not directly limit the number of active radios. Since larger numbers of phones can be served by smaller numbers of cell-sites, CDMA-based standards have a significant economic advantage over TDMA-based standards. The main 2G TDMA standard is: * GSM (Global System for Mobile communications)--is the most popular standard for mobile phones in the world. GSM accounts for over 80% of all subscribers around the world. It makes international roaming very common between mobile phone operators, enabling subscribers to use their phones in many parts of the world. GSM differs from 1G in that both signaling and speech channels are digital.

The main 2G CDMA standard is:

* IS-95 (Interim Standard 95) is the first CDMA-based digital cellular standard pioneered by Qualcomm. The brand name for IS-95 is cdmaOne.

Capacity Since 2G technology uses digital signal between the handsets and the towers, it increases the system capacity in two ways: 1. Digital voice data can be compressed more effectively than analog voice encodings through the use of various codecs, allowing more calls to be packed into the same amount of radio bandwidth.

2. Digital…...

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