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demodulation of GMSK using usrp and labview

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.

 

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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

Sastry Vadlamani
RF Principal Software Engineer
Aerospace and Defence BU
National Instruments
Certified LabVIEW Architect
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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?

 

 

 

 

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