Re: Help regarding identification of modulation(GMSK) type of a signal
Nilnod wrote:
I guess Ravi is interested with received signal which was GMSK
modulated at transmission side - a typical mobile communication like
GSM or EDGE scenario.
The is related to something called "blind demodulation" where we do not
know in advance what received signal is coming - GMSK/8PSK etc.
I can not give detailed algorithm here. For example, a GSM burst
training sequence is known a prior. Someone can exploit correlation
property and calculate engery. If the engegy achieved through GMSK
correlation is high enough compared to that of others (say 8PSK) then
modulation type is GMSK.
Cheers
Santosh
In the GSM case it's moot -- GSM includes a frequency correction burst
which is around 68kHz above the carrier for GMSK and below the carrier
for 8PSK. That's pretty distinctive. Unless he just couldn't wait
around for the FB he could easily tell.
--
Tim Wescott
Wescott Design Services
http://www.wescottdesign.com
.
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