Question: Compare GSM and CDMA technologies.
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Subject : Mobile Communication

Topic : GSM

Difficulty : Medium

mobile communication • 379 views
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modified 3 months ago by gravatar for Ankit Pandey Ankit Pandey70 written 4 months ago by gravatar for rajeshree.kumbhar5018 rajeshree.kumbhar501810
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S.no GSM CDMA
1 The GSM is based on wedge spectrum called a carrier. The CDMA is based on spread spectrum technology.
2 This carrier is divided into time slots, and each user is assigned a different time slot. Thus, until the ongoing call is finished, no other user can access the same slot. This technology allows each user to transmit over the entire frequency spectrum all the time.
3 Less security compared to CDMA technology. More security is provided in CDMA technology.
4 No built-in encryption. It has built-in encryption
5 Signals can be detected as the GSM signals are concentrated in the narrow bandwidth. The signals cannot be detected easily in CDMA.
6 The GSM network operates in the frequency spectrum of 850MHz and 1900MHz. The CDMA network operates in the frequency spectrum of 850MHz and 1900MHz.
7 GSM is used over 80% of the world’s mobile network. CDMA is exclusively used in the United States, Canada and Japan.
8 GSM uses EDGE data transfer technology CDMA has faster data transfer as EVDO ready data transfer technology is used
9 It offers a maximum download speed of 384 Kbps. It offers a maximum download speed of 2 Mbps.
10 A SIM card is required for the working of GSM device. CDMA phones do not have these pulses.
11 A GSM is more flexible than CDMA as the SIM can be replaced with other GSM devices. A CDMA is not flexible.
12 GSM phones emit continuous wave pulse. Thus, there is a need to reduce the exposures to electromagnetic fields. CDMA phones do not have these pulses.
13 GSM phone emits about 28 times more radiations on an average as compared to CDMA. Very less radiation
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written 3 months ago by gravatar for Ankit Pandey Ankit Pandey70
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