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What is the main difference between GSM & CDMA?
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Answer Posted / vipul srivastava
GSM and CDMA have following differences-
1. The GSM stands for global system for mobile communication and CDMA for code division multiple accesses.
2. GSM is a form of multiplexing, which divides the available bandwidth among the different channels. Most of the times the multiplexing used is either TDM (Time division multiplexing) or FDM (Frquency division multiplexing). On the other hand CDMA is a type of multiple access sceheme( which means allotting the given bandwidth to multiple users) and makes use of spread spectrum technique which is essentially increasing the size of spectrum.
3. In CDMA each user is provided a unique code and all the conversation between 2 users are coded. This provides a greater level of security to CDMA users than the GSM ones.
You can understand the basic difference between CDMA and GSM with the following example.
Suppose there is a big room in which there are 10 couples who wish to talk but in way that they are not disturbed. There are 3 ways of doing this-
1. Only one couple stay in the roo and rest 9 leave it for a while, say 5 minutes. For those 5 minutes that couple can talk with each other and at the end of that it will go out and the next couple will come. At the end of the time slot of 10th couple, the 1st couple will come back to continue its conversation and the cycle would continue.
This is analogous to TDMA (Time division Multiple acess) a technique derived from TDM.
2. Another way is to divide the area of the room in 10 equal parts and then ask these couples to stay within their respective areas and talk.
This is analogous to FDMA (Frequency Division Multiple Access), a technique derived from FDM.
3. Finally the couples can be allowed to stand anywhere in the room and converse. They need not wait to get their time slot or be confined in a particular place. The only condition now is that all of them must speak in different languages.
This is analogous to CDMA technique.
I hope it will help you to understand these technologies.
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