Re: [Discuss-gnuradio] Adding Attenuation in GNU radio

[Anon Lister]

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" <address@hidden> 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 <address@hidden> 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

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