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Categories >> Software >> Telecom >> GSM >> WiFi Related
 
 


 

 
 WiFi Protocols interview questions  WiFi Protocols Interview Questions (3)
 WiFi Hardware interview questions  WiFi Hardware Interview Questions (0)
 WiFi Security interview questions  WiFi Security Interview Questions (2)
 GSM interview questions  GSM Interview Questions (12)
 CDMA interview questions  CDMA Interview Questions (8)
 WAP interview questions  WAP Interview Questions (2)
 ISDN interview questions  ISDN Interview Questions (2)
 BlueTooth interview questions  BlueTooth Interview Questions (54)
 WiFi AllOther interview questions  WiFi AllOther Interview Questions (3)
Question
What is the main difference between GSM & CDMA?
 Question Submitted By :: GSM
I also faced this Question!!     Answer Posted By  
 
Answer
# 1
gsm is stands for global system for mobile communication. it
use tdma & fdma techniques as access mechanism . in gsm we
devide bandwidth in to time slots for better utilization of
bandwidth.

cdma stands for code devision muliple access it use cdma
techniques as access mechanism . in cdma we allocate a
unique code for every user saparately and allocate bandwidth
to user
 
Is This Answer Correct ?    891 Yes 104 No
Subodh Sharma
 
Answer
# 2
gsm is global system for mobile communication. it uses fdma
& tdma.

cdma:- it stands for code division mutiple access.
 
Is This Answer Correct ?    946 Yes 269 No
Ramesh
 
 
 
Answer
# 3
GSM and CDMA techniques can be explained with an example
suppose there are 10 persons in a room and they want to
communicate with each other .How can they communicate?
First method:One persons speaks at one time that means we
have provided a definite time interval to that person.-GSM
Second method :all the peers speak at a time in a different
language which we call as CDMA
 
Is This Answer Correct ?    605 Yes 173 No
Akshay
 
Answer
# 4
The main difference between GSM and CDMA is: In GSM, the
entire frequency band is not available to the end-user,
while in CDMA the entire frequency band is available to the
end-user. So, the Frequency Re-use factor is 1 in CDMA.

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.
 
Is This Answer Correct ?    429 Yes 57 No
Sudhindra S Kulkarni
 
Answer
# 5
GSM is a Global Syatem For Mobile Communication.

GSM Operates 3 bands, 1) GSM 900 2) GSM 1800 and 3) GSM
1900.

GSM 900 & GSM 1800 are used in india, But, GSM 1900 used in
USA.

GSM and CDMA techniques can be explained with an example,

suppose there are 10 persons in a room and they want to
communicate with each other .How can they communicate?
First method:One persons speaks at one time that means we
have provided a definite time interval to that person.-GSM
Second method :all the peers speak at a time in a different
language which we call as CDMA

CDMA stands for Code Division Multiple Access and GSM
stands for Global system for Mobile Communication.
In CDMA phones the software is integral with the phone
instrument and in the case of GSM phones it is through the
SIM Card.

CDMA phone instruments are dedicated to the service
provider. GSM phone instruments are portable across service
providers through SIM cards.
 
Is This Answer Correct ?    351 Yes 57 No
Manimaran
 
Answer
# 6
ans 11.. is copied from somewhere else.... just copy and
paste...
 
Is This Answer Correct ?    153 Yes 17 No
Bbb
 
Answer
# 7
First it is important to know that one is an access scheme
and the other is not.
GSM is Global System for Mobile Communications which uses
FDMA/TDMA access schemes. In GSM users are seperated in time
and frequency.
While CDMA which is known as Code Division Multiple access
is an access scheme used by UMTS where users are seperated
by different codes but all users can transmit at the same
time and on the same frequencies in the same region of space.
 
Is This Answer Correct ?    51 Yes 18 No
Jay
 
Answer
# 8
GSM uses a specific frequency for each user in the cell,
while cdma uses the entire available spectrum
 
Is This Answer Correct ?    39 Yes 6 No
Smiley
 
Answer
# 9
mobile statio(M.S)=mobile equipmemt(M.E)+ SIM (subscriber
identity module)


satya_823@yahoo.co.in
 
Is This Answer Correct ?    93 Yes 61 No
Satya
 
Answer
# 10
GSM (Global System for Mobile Communications)

GSM is the “branded” term referring to a particular use of
TDMA (Time-Division Multiple Access) technology.
GSM is the dominant technology used around the globe and is
available in more than 100 countries.
It is the standard for communication for most of Asia and
Europe.
GSM operates on four separate frequencies: You’ll find the
900MHz and 1,800MHz bands in Europe and Asia and the 850MHz
and 1,900MHz (sometimes referred to as 1.9GHz) bands in
North America and Latin America.
GSM allows for eight simultaneous calls on the same radio
frequency and uses “narrowband” TDMA, the technology that
enables digital transmissions between a mobile phone and a
base station.
With TDMA the frequency band is divided into multiple
channels which are then stacked together into a single
stream, hence the term narrowband. This technology allows
several callers to share the same channel at the same time.


CDMA (Code Division Multiple Access)
CDMA takes an entirely different approach from GSM/TDMA.
CDMA spreads data out over the channel after the channel is
digitized.
Multiple calls can then be overlaid on top of one another
across the entire channel, with each assigned its
own “sequence code” to keep the signal distinct.
CDMA offers more efficient use of an analog transmission
because it allows greater frequency reuse, as well as
increasing battery life, improving the rate of dropped
calls, and offering far greater security than GSM/TDMA.
For this reason CDMA has strong support from experts who
favor widespread development of CDMA networks across the
globe.
Currently, you will find CDMA mostly in the United States,
Canada, and North and South Korea. (As an interesting
aside, CDMA was actually invented for the military during
World War II for field communications.)
 
Is This Answer Correct ?    33 Yes 5 No
Karthikeyan
 

 
 
 
Other GSM Interview Questions
 
  Question Asked @ Answers
 
what is GSM? ZTE 2
what is the relation between RXLEV [0 to 63] and rxlev [- 110 to -47]? Ericsson 7
What is the difference between FER and BER? GTL 3
Which is the digital modulation used today in telecomn? (whatever his question meant the answer was CDMA) 2) Why is walse code used? then, noncoherent detection, coherent detection, Pn code(y it is used?) etc Reliance 14
1.What is the difference between Diplexer and Duplexer and what position? 2. What is the different between CDU C and CDU A 3. How do you link a T1 from the 1st BTS to 2nd BTS 4. What is the value for TEI 1st T1? 5. What is the SSI? Ericsson 3
we know that the main function of bts is to air interface signaling.but why?????????? Airtel 2
what is Telecom regulatory body of India? Reliance 11
what is GSM? ZTE 41
What is the defference between Rx Lev Sub and Rx Lev Full? What you mean by Link Budget?can you explain Lucent 4
What are the various blocks in GSM architecture? Reliance 23
Anyone any idea about LTE and GSM internetworking. Is it like GSM is used for backbone comm in LTE?? NSN 4
What is the main difference between GSM & CDMA? HCL 72
 
For more GSM Interview Questions Click Here 
 
 
 
 
 


   
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