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Re: [Discuss-gnuradio] Gaining RSSI, SNR, CNR or BER information

From: Johnathan Corgan
Subject: Re: [Discuss-gnuradio] Gaining RSSI, SNR, CNR or BER information
Date: Fri, 9 May 2008 07:18:05 -0700

On Fri, May 9, 2008 at 2:22 AM, Bastian Preindl <address@hidden> wrote:

> As we're not the operator of the satellites, it is impossible to know
> the data we'll receive beforehand and make a comparison afterwards to
> calculate the bit error rate. So I have to count on information I can
> gain from the received signal characteristics.

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
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:


GNU Radio is very suitable for this sort of thing.

Johnathan Corgan
Corgan Enterprises LLC

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