You can also check out the channel model block in GRC, there's also several other useful blocks under the imparements category that may be useful for modeling different kinds of environments like multipath or doppler.
On Jul 16, 2017 6:20 PM, "Jose Ruvalcaba" <[email protected]> wrote: > Hi Marcus, > > Thanks for your response. I'm trying to make a channel simulator where my > signal going into the USRP gets attenuated by free space path loss. > Typically, I know that this is done through the use of hardware, like fixed > attenuators, but I wanted to go into an all DSP approach with the use of > GNU radio. > > Regards, > Jose > > On Sun, Jul 16, 2017 at 3:38 AM, Marcus Müller <[email protected]> > wrote: > >> Hi Jose, >> >> yep, multiply const with a real value |·| < 1 would be **equivalent** to >> an analog attenuator. >> >> anyway, it's very uncommon to do such an operation in DSP, unless you >> need a fair comparison between different signals or such. >> >> Maybe you'd want to explain why you want to do that? >> >> Best regards, >> >> Marcus >> >> On 07/16/2017 07:23 AM, Jose Ruvalcaba wrote: >> >> Hello, >> >> This may seem like a really simple question, but If I wanted to attenuate >> my signal coming out from a USRP source block in GRC, say by 80 dB,, how >> would I go ahead and do that? Would I just add a multiply constant block >> after my USRP source block to scale down the incoming signal's amplitude? >> Would I be able to check my attenuated signal through the QT frequency plot >> block? >> >> >> Thanks, >> Jose >> >> >> _______________________________________________ >> Discuss-gnuradio mailing >> [email protected]https://lists.gnu.org/mailman/listinfo/discuss-gnuradio >> >> >> >> _______________________________________________ >> Discuss-gnuradio mailing list >> [email protected] >> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio >> >> > > _______________________________________________ > Discuss-gnuradio mailing list > [email protected] > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio > >
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