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From: | Richard Bell |
Subject: | Re: [Discuss-gnuradio] Correlation Estimator Over the Air |
Date: | Fri, 2 Oct 2015 10:12:34 +0200 |
I can't open and look at your flow now, but it seems you have the necessary blocks in there. Here are some things that come to mind: 1) put a multiply const block in front of the usrp source at the tx. You don't want to feed values ranging from 1 to -1 but rather ~0.7 to -0.7. 2) keep usrp tx/rx analog gains below 20dB to avoid odd behavior. Keep the usrps close to each other for this debug. I use 15dB for initial testing. 3) Costas loop will only fix small frequency offsets. Try adding an FLL block before timing sync. 4) are you sure you used the right taps for the pfb clock sync block? How did you confirm this? 5) BPSK requires an equalizer if you have a bad channel. Are you using antennas or a coax cable? Rich Sent from my iPhone
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