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GMSK modulation
Case of frequency correction burst
Solving modulation equations
One bit change
Normal duration burst



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Normal duration burst

GSM Normal duration burst [Under GSM]

Below diagram illustrates power vs time map for GSM normal duration (48/13 μs, 3GPP TS 45.010:5.7.1) bursts (i.e.Normal burst, Frequency correction burst, and Synchronisation burst, 3GPP TS 45.002:5.2) as per 3GPP TS 45.005:Annex B.

gsm-normal-duration-burst.png

Above plot was drawn with gnuplot. Please find the script and related data files at Let us discuss Telecom.


Normal burst

Tail bits
3
Encrypted bits
58
Training sequence
26
Encrypted bits
58
Tail bits
3
Guard period
8.25



Frequency correction burst

Tail bits
3
Fixed bits
142
Tail bits
3
Guard period
8.25



Synchronisation burst

Tail bits
3
Encrypted bits
39
Synchronisation sequence
64
Encrypted bits
39
Tail bits
3
Guard period
8.25



References: GSM book by Mouly and Pautet.

© Copyright Samir Amberkar 2013