demodulation of GMSK using usrp and labview

[Aht22]

hello everyone,

I want to demodulate GMSK data using LabVIEW and usrp.for this I use MSK example from modulation toolkit and choose filter type:  Gaussian filter but  unable to demodulate the data.

kindly help me in this issue.

[Sastry]

You need to look at the signal closely.

1. Where is the signal coming from ?

2. What is the symbol rate ?

3. What are trying to measure? EVM ? MER? BER? Raw Bits etc.

4. If you know of a known sequence in the message, you can try that sequence for synchronization

Hope the above helps. Let me know if you still face issues.

Regards

Sastry

[Aht22]

hi Sastry,

thanks for your reply

1-The signal is coming from digital radio.and received using usrp 2944.

2-the symbol rate is approx 3-4k.which is not known exactly.

3-i want to demodulate the signal and listen audio.

->I don't know how many samples per symbol is used.?

->How to demodulate the gmsk signal without knowing its modulation parameters?