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Difference Between GSM and CDMA

Dinesh jain

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Difference Between GSM and CDMA
GSM (Global System for Mobile Communication)
and CDMA (Code Division Multiple Access) are
two dominant technologies for mobile
communication.
1.Technology


The CDMA is based on spread spectrum
technology which makes the optimal use of
available bandwidth. It allows each user to
transmit over the entire frequency spectrum all
the time. On the other hand GSM operates on
the wedge spectrum called a carrier. This carrier
is divided into a number of time slots and each
user is assigned a different time slot so that until
the ongoing call is finished, no other subscriber
can have access to this. GSM uses both Time
Division Multiple Access (TDMA) and Frequency
Division Multiple Access (FDMA) for user and
cell separation. TDMA provides multiuser access
by chopping up the channel into different time
slices and FDMA provides multiuser access by
separating the used frequencies.


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2.Security

More security is provided in CDMA technology as
compared with the GSM technology as
encryption is inbuilt in the CDMA. A unique code
is provided to every user and all the
conversation between two users are encoded
ensuring a greater level of security for CDMA
users. The signal cannot be detected easily in
CDMA as compared to the signals of GSM, which
are concentrated in the narrow bandwidth.
Therefore, the CDMA phone calls are more
secure than the GSM calls. In terms of
encryption the GSM technology has to be
upgraded so as to make it operate more
securely.



3. Spectrum Frequencies

The CDMA network operates in the frequency
spectrum of CDMA 850 MHz and 1900 MHz while
the GSM network operates in the frequency
spectrum of GSM 850 MHz and 1900 MHz.


4. Global Reach
GSM is in use over 80% of the world’s mobile
networks in over 210 countries as compared to
CDMA. CDMA is almost exclusively used in
United States and some parts of Canada and
Japan. As the European Union permissions GSM
use, so CDMA is not supported in Europe. In
North America, especially in rural areas, more
coverage is offered by CDMA as compared to
GSM. As GSM is an international standard, so it’s
better to use GSM in international roaming. GSM
is in use by 76% of users as compared to CDMA
which is in use by 24% users.



5. Data Transfer Rate

CDMA has faster data rate as compared to GSM
as EVDO data transfer technology is used in
CDMA which offers a maximum download speed
of 2 mbps. EVDO ready mobile phones are
required to use this technology. GSM uses EDGE
data transfer technology that has a maximum
download speed of 384 kbps which is slower as
compared to CDMA. For browsing the web, to
watch videos and to download music, CDMA is
better choice as compared to GSM. So CDMA is
known to cover more area with fewer towers.



6. . Radiation Exposure
GSM phones emit continuous wave pulses, so
there is a large need to reduce the exposures to
electromagnetic fields focused on cell phones
with “continuous wave pulses”. On the other
hand CDMA cell phones do not produce these
pulses. GSM phones emit about 28 times more
radiation on average as compared to CDMA
phones. Moreover, GSM phones are more
biologically reactive as compared to CDMA.
[/size]

Difference Between GSM and CDMA | GSM vs CDMA
 

SarfaRaZ

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Good Informative update @dinesh bhai.
 

Sarkar

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Is 3G(HSPA can be as fast as 42 Mbps at least in theory where as CDMA's max speed is 3.6 Mbps) not GSM ? Why is the article only compairing with EDGE network ? Someone plz clarify it

And GSM also works on 900 MHz and 1800 MHz but article doesn't mentioned it
 

Dinesh jain

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Sarkar said:
And GSM also works on 900 MHz and 1800 MHz but article doesn't mentioned it
already mentioned @ point no.3
 

sam

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WCDMA is a New Technology

as GSM & CDMA are 2g technology (900/1800)

WCDMA is 3G with 2100 frequency...
 

Sarkar

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dinesh jain said:
already mentioned @ point no.3
:skd
Where bro ? :huh

Can u plz show it. I think I need an eye doc as I cannot see it
 

Sarkar

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syam said:
GCDMA is a New Technology

as GSM & CDMA are 2g technology (900/1800)

GCDMA is 3G with 2100 frequency...
I know WCDMA which is 3G in GSM but What is GCDMA ?:huh

As far as I know HSPA(also called 3.5G) is GSM.
 

sam

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Sarkar said:
I know WCDMA which is 3G in GSM but What is GCDMA ?:huh

As far as I know HSPA(also called 3.5G) is GSM.
its is mistake bro....

Yes its W not G
 
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