Wednesday, September 16, 2009

DIFFERENCE BETWEEN GSM AND CDMA??

>Both GSM (Global System for Mobile Communications) and CDMA (CodeDivision Multiple Access) are technologies that work on radiofrequencies, with the mobile phone handset being the antenna receiving the signal.
> GSM uses SIM cards(Subscriber Identity Module) whereas, CDMA based phones do not.
>it is the SIM card that is tied to the network,where on CDMA networks it is the handset itself that is linked to thecarrier.
>Third Generation technology (3G) is used by both systems, so is fullycompatible with both. A handset that is 3G compatible can be used forboth GSM carriers and for CDMA signals
>
GSM Works as follows:--------------------- The entire frequency band is divided into chunks and each such chunk is divided into timeslots and each such portion is made available to a user. CDMA Works as follows:----------------------- The entire frequency band is available to the user. So, in order to differentiate, the transmission from each user is "spread" or coded using an unique code given to individual user. At the receiving end, the spread information is decoded.

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