Interested to Buy Any Domain ? << Click Here >> for more details...
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
- 15 Answers
- 28969 Views
- Reliance, Spice Telecom, I also Faced
- E-Mail Answers
Answer Posted / amisha
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 |
Post New Answer View All Answers
Explain what is the deference between rx lev sub and rx lev full?what you mean by link budget?
Explain cycling frequency hopping?
How do you link a t1 from the 1st bts to 2nd bts?
What is the gsm?
What is the value for tei 1st t1?
Explain maio?
Explain about gsm technologies?
what is the deference between rx lev sub and rx lev full?what you mean by link budget?
What is frequency re-use in gsm technology?
What is transmitted power control in gsm technology?
Which technology is used in GSM?
What is arfcn in gsm technology?
What is wps in gsm technology?
What is the ssi?
What is dtx in gsm technology?
