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Re: [Discuss-gnuradio] gmsk error


From: Matt Ettus
Subject: Re: [Discuss-gnuradio] gmsk error
Date: Tue, 06 Dec 2005 16:11:31 -0800
User-agent: Mozilla Thunderbird 1.0.7-1.1.fc4 (X11/20050929)

> What should the data going in and out of the gr.clock_recovery_mm_ff look
> like?

Your data looks good except for the DC offset.

> I see that in gmsk2.py you remove DC offset, should the signal be varying
> +/-Vpeak equally?

Yes, the data should be symmetric about zero.

> Any requirements that the signal should be over sampled?

You have plenty of oversampling there

> Is the output basically resampled at the data clock rate so that each
> output point represent a bit?

Yes.

Also, keep in mind that the M&M synchronizer gain is proportional to
sample amplitude.  This will affect your loop bandwidth.

Matt




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