Modulation Known from the Spectrum

Hello,

Can anyone share something so that i
can determine the following information from the given spectrum:

1. Modulation type ( FSK, QPSK, QAM ... )
2. Symbol rate

Thanks in advance for your help.

Hi,

From a spectrum plot (frequency domain) Its difficult to know the modulation type, and symbol rate I think its impossible.
May be by measuring the bandwidth you can make a guess depending on system (like 5 MHz Bw means it can be WCDMA and then look for WCDMA modulation ,1 MHz means bluetooth etc ).
Symbol rate depends on type of modulation and algorithm used.
You can measure both with a VSA having demodulation function. By seeing the constellation (in case of digital modulation) you can know what type of modulation is it and then by entering appropriate settings , the symbol rate.

Regards
GV