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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)
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
 Question Submitted By :: GSM
I also faced this Question!!     Answer Posted By  
# 1
Is This Answer Correct ?    25 Yes 5 No
# 2
Is This Answer Correct ?    10 Yes 2 No
# 3
GMSK for gsm with gprs only,
8psk for gsm with EDGE support.
Is This Answer Correct ?    6 Yes 1 No
# 4
Currently the digital modulation used in telecom is GSMK
GMSK is a form of modulation used in variety of digital
radio communication systems.It has an advantage4s of being
able to carry digital modulation while still using the
spectrum efficiently.
One of the problems with other forms of phase shift keying
is that the sidebands extend outwards from the main
carrierand this can cause interference to the other radio
communication systems using nearby channels.
Is This Answer Correct ?    5 Yes 0 No
Kenneth Yindi
# 5
in GSM we use GMSK

Spreading Code are use for following reason:

The effectiveness of CDMA scheme relies on the mutual
orthogonality of spreading codes to minimize the cross
interference among physical code channels.Therefore
spreading code should be consistently defined and generated
at transmitters and receivers such that this orthogonality
can be achieved and maintained across the radio link.

Walsh Code:Walsh Code are set of perfectly orthogonal codes
typically used for channelization ,that is,separating
different physical channels transmitted by a node.

PN Code:PN codes are set of psuedo-random but
deterministically generated sequences .
Properties of Psuedo Code are:

1Sharp Autocorrelation ,so that any time shifted version of
a PN code has almost no correlation with the original sequence
2 Equal number of '1' andd '0' in any long segment of the
sequence ,so that the signal has no bias
3 Random and independent appearances of '1' and '0' so that
it is difficult to to reconstruct from any short segment

Basically PN codes act as Base station signature.
Is This Answer Correct ?    5 Yes 0 No
# 6
GMSK for gsm..

8-PSK for EDGE
Is This Answer Correct ?    8 Yes 5 No
Rishad Basheer
# 7
In GSM GMSK FOr Voice & 8-PSK & GMSK For Data.
Is This Answer Correct ?    4 Yes 1 No
Santosh Kumar Nigam
# 8

QPSK,16 QAM and 64 QAM in CDMA. It totally depends upon CQI.
If CQI>16 16 QAM or 64 QAM is used depending upon the NW
Is This Answer Correct ?    1 Yes 1 No
# 9
Is This Answer Correct ?    0 Yes 0 No
S.narsimha Swamy
# 10

2)To Defferinciiate user
Is This Answer Correct ?    2 Yes 3 No

Other GSM Interview Questions
  Question Asked @ Answers
we know that the main function of bts is to air interface signaling.but why?????????? Airtel 2
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
What is the defference between Rx Lev Sub and Rx Lev Full? What you mean by Link Budget?can you explain Lucent 4
what is GSM? ZTE 41
What are the various blocks in GSM architecture? Reliance 23
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
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
What is the main difference between GSM & CDMA? HCL 72
what is GSM? ZTE 2
what is Telecom regulatory body of India? Reliance 11
Anyone any idea about LTE and GSM internetworking. Is it like GSM is used for backbone comm in LTE?? NSN 4
For more GSM Interview Questions Click Here 

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