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From: | Anon Lister |
Subject: | Re: [Discuss-gnuradio] Adding Attenuation in GNU radio |
Date: | Sun, 16 Jul 2017 18:29:05 -0400 |
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,JoseOn 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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