IF to baseband conversion

[SunJab]

Hi,

I want to frequency shift a signal from IF to 0Hz (baseband) using 'MT downconvert passband VI'.

I am reading the IF signal from a wave file and giving it to the MT downconvert passband VI....The VI help says it downconverts a real passband signal data of a user specified bandwidth and returns the complex IQ (baseband) data.

 I want to know what is the relationship between passband bandwidth , carrier frequency(i.e IF) and the sample rate ???

I know that the sample rate should be atleast twice the carrier frequency but what about the passband bandwidth???

Here is an example....i have tried to shift a PSK modulated signal (having carrier freq:10k Hz and Sample rate:32k) to baseband...but when i give a passband bandwidth value greater than 11k Hz, it gives me an error saying, 'Invalid sampling rate for requested carrier; Increase the sample rate or decrease the passband bandwidth'

Please help me out!

Thanks in advance 😃

 Sandy

[Paul_C.]

Hey Sandy,

Please keep your posts to a single thread in the future.  It helps us keep our forums organized for our future customers to find answers to their questions.  For everyone else, suggestions have been posted to the thread here.

Regards,

Paul C.