Re: [Discuss-gnuradio] two questions about the general communication system

[George Nychis]

So... if the noise channel is on your laptop, you must have generated 
this channel?  Is it a simulated channel?  Are you specifying the noise 
power?

You're not giving us much information.

- George


Bill Stevenson wrote:
> Thank you! What i am trying to do is very simple: I don't use USRP, i 
> just used a vector as a bit source and have it modulated and transmitted 
> through a noise channel (on my laptop ^.^ ). Now i can set the value of 
> noise's amplitude, but there seems to be no way to determine the bit 
> energy! How to get it?  Thank you!!!
>
> Bill
>
> ----- Original Message ----
> From: Daniel Halperin <address@hidden>
> To: Brian Padalino <address@hidden>
> Cc: Bill Stevenson <address@hidden>; address@hidden
> Sent: Sunday, April 13, 2008 8:18:14 PM
> Subject: Re: [Discuss-gnuradio] two questions about the general 
> communication system
>
> -----BEGIN PGP SIGNED MESSAGE-----
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> On Apr 13, 2008, at 1:28 PM, Brian Padalino wrote:
>  > On Sun, Apr 13, 2008 at 2:38 PM, Bill Stevenson
>  > <address@hidden <mailto:address@hidden>> wrote:
>  >>
>  >> Thank you George!
>  >>
>  >> I am just wondering when we calculate BER, how can we determine the 
>  >> value of
>  >> bit energy? Thank u!
>  >
>
> If you look through the relevant emails on the list, it seems no one 
> really understands the translation between the short values from the 
> USRP and absolute energy --- ADC and processing behavior complicate 
> the issue. However, it is much easier to estimate the ratio of Signal 
> to Noise --- this is a relative quantity. Just figure out receiver 
> power in the absence of a signal and in the presence of one...
>
> - -Dan
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