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


From: Bill Stevenson
Subject: Re: [Discuss-gnuradio] two questions about the general communication system
Date: Sun, 13 Apr 2008 22:16:59 -0700 (PDT)

Sorry! Below was a typo! Eb should be set to1, I think. Thank you

Bill

----- Original Message ----
From: Bill Stevenson <address@hidden>
To: address@hidden
Sent: Monday, April 14, 2008 12:27:58 AM
Subject: Re: [Discuss-gnuradio] two questions about the general communication system

Thank u George!!!

I know i have to calculate, but how much I set Eb/N0 to? Now i think it should be set to 1.

Bill

----- Original Message ----
From: George Nychis <address@hidden>
To: Bill Stevenson <address@hidden>
Cc: address@hidden
Sent: Monday, April 14, 2008 12:00:45 AM
Subject: Re: [Discuss-gnuradio] two questions about the general communication system

Read not only the document that I sent you, but the document that Brian
sent you too.  You can lead a horse to water, but you can't make it drink.

Both docs tell you have to make the calculation.

- George


Bill Stevenson wrote:
>
>
> ----- Forwarded Message ----
> From: Bill Stevenson <address@hidden>
> To: George Nychis <address@hidden>
> Sent: Sunday, April 13, 2008 11:58:08 PM
> Subject: Re: [Discuss-gnuradio] two questions about the general
> communication system
>
> I meant: i was just simulating a simple communication system using
> GnuRadio, and i just have the transmitted bits connected with a noise
> source (gr.noise_source_c(gr.GR_GAUSSIAN, noise_voltage)). Now the only
> thing left is the bit energy. :) Thank you!!!
>
> Bill
>
> ----- Original Message ----
> From: George Nychis <address@hidden>
> To: Bill Stevenson <address@hidden>
> Cc: address@hidden
> Sent: Sunday, April 13, 2008 11:50:41 PM
> Subject: Re: [Discuss-gnuradio] two questions about the general
> communication system
>
> 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
> <mailto:address@hidden>>
>  > To: Brian Padalino <address@hidden <mailto:address@hidden>>
>  > Cc: Bill Stevenson <address@hidden
> <mailto:address@hidden>>; address@hidden
> <mailto: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-----
>  > Hash: SHA1
>  >
>  > 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>
> <mailto: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
>  > -----BEGIN PGP SIGNATURE-----
>  > Version: GnuPG v1.4.8 (Darwin)
>  >
>  > iEYEARECAAYFAkgCosYACgkQy9GYuuMoUJ5Y0wCeOCwmgH5VQvjZpr4R5BQ1njxE
>  > 1zcAn36qQQCkWJHOMhK10RERFA7B3hZo
>  > =1lA0
>  > -----END PGP SIGNATURE-----
>  >
>  >
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