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

[Jose Ruvalcaba]

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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