06-14-2012 08:10 AM
Recently I was doing some research with USRP2. I set the RX frequency to 2.441G and the IQ sample rate to 10M. According to the sample theorem, my USRP2 can sample signals with a bandwidth of 5M. So How can I select the 2.442G, 2.440G signals out of the samples?
Thanks in advance!
06-14-2012 08:22 AM - edited 06-14-2012 08:25 AM
06-14-2012 09:02 AM
ErikL, thanks for your kindl help.
But how to set the center frequency that I want to process? For example, when I want to process signals of 2.441G, I can set the RX frequency to 2.441G, and IQ sample rate to 10M. But If I want to process signals of 2.442G or 2.440G, should I need to set the RX frequency and receive again? Do the signals received with the RX frequency set to 2.441G already contains the signals of 2.442G and 2.440G?
06-14-2012 10:19 AM
I look up the spectrum of the samples I received. Yes, all the signals in the 10M bandwidth are received. If I want to do demodulation to the received signals, do I need to adjust the center frequency of the received samples to 0 Hz?
06-25-2012 10:49 AM
The received complex valued signal samples are effectivly at 0 Hz, but since they have been downconverted, you can think of them as being signal samples from the original location of your center frequency.