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Re: [Discuss-gnuradio] Re: new to GNU radio

From: Steven Clark
Subject: Re: [Discuss-gnuradio] Re: new to GNU radio
Date: Tue, 4 Mar 2008 11:58:24 -0500

If you are using the USRP, it handles all the conversion to and from
carrier frequency. The data going across the USB bus is generally
complex baseband.
You instruct the USRP what the carrier frequency should be:

        #Set freq
        if not(usrp.tune(self.usrp_out, 0, self.out_dcard, tx_freq)):
            print "Failed to set initial frequency"
            self._set_status_msg("Failed to set initial frequency")

On Tue, Mar 4, 2008 at 11:37 AM, Manav Rohil <address@hidden> wrote:
> yup..got it..thanks..
>  i understood in QPSK how the bits get mapped to constellation space.
>  One doubt still persists.QPSK modulation theory tells us that we need to
>  change the phase of the carrier depending upon the incoming data
>  bits..i.e what we see mapped to the constellation space is the modulated
>  data.
>  I cannot see a carrier frequency specified anywhere in bqpsk.y..Where do
>  i specify the carrier frequency for my transmission...this part is still
>  a bit hazy...
>  I can see the incoming bits getting mapped to constellation space not
>  the modulated data..M i missing something here?
>  Thanks
> Manav
>  --
>  Posted via http://www.ruby-forum.com/.
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