Re: [Discuss-gnuradio] BPSK Demod

[Laur Joost]

Also, your Polyphase Clock Sync is outputting 1 samples per symbol ("Output SPS"), while your equalizer is expecting 2 samples per symbol (If I understand the arguments correctly. Don't have GnuRadio intalled, and haven't used it myself)

Laur

2017-04-13 1:40 GMT+03:00 Kacie O'Neil <address@hidden>:

I'm having trouble with a BPSK Modulation/Demodulation flowgraph I built (picture attached). I am using a Vector Source and a Constellation Modulator block with a BPSK default constellation object. I'm using a vector source because I want to verify that I can modulate and correctly demodulate/decode data, not just a random source. I'm trying to start with something simple.

For the demod, I'm following the PSK Demodulation Tutorial from the gnuradio wiki (https://wiki.gnuradio.org/index.php/Guided_Tutorial_PSK_Demodulation) so I have a Polyphase Clock Sync, CMA Equalizer and Costas Loop followed by a Constellation Decode block (using the same bpsk object as the constellation modulator) which I send into a file sink.

Part of my problem is that what I end up with in my File Sink is not what I'm expecting, so I have no way to know if the data I'm attempting to send is being modulated and demodulated correctly. I'm wondering if maybe I'm not sending data in the right format to the file sink (or any other block really), or if the fact that I didn't include a channel model or used a UHD device is creating a different result. If anyone has any suggestions or comments, they would be greatly appreciated!

Thanks!
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