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From: | Bastian Preindl |
Subject: | Re: [Discuss-gnuradio] Gaining RSSI, SNR, CNR or BER information |
Date: | Fri, 09 May 2008 16:38:22 +0200 |
User-agent: | Thunderbird 2.0.0.14 (Macintosh/20080421) |
Dear Jonathan,
If you use the USRP, you will obtain a complex baseband representation of your satellite signal. From this, you will need to implement a demodulator for the particular signal involved. From the output of
As far as I know there already exist demodulators for (A)FSK, BPSK and MSK - which covers the majority of the small satellites we focus on.
the demodulator, there are several ways to estimate signal-to-noise ratio that do not require prior knowledge of the bit pattern. From the signal-to-noise ratio, you can estimate the theoretical bit error rate for the type of modulation in use. See: http://www.comsoc.org/comm/private/2000/oct/1681_48comm10-pauluzzi.html GNU Radio is very suitable for this sort of thing
That are very good news for me! I'm aware about the relations between SNR and BER - I just wonder about the several ways to estimate the SNR in GnuRadio. That's exactly the information I lack of - do you have any documentation/examples/sources for how to accomplish that?
And what about the usage of sound cards as ADC? Can I also obtain SNR information when I just have an audio stream as source?
Many thanks and best regards Bastian
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