----- Forwarded Message ---- From: Bill Stevenson <[EMAIL PROTECTED]> To: George Nychis <[EMAIL PROTECTED]> 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 <[EMAIL PROTECTED]> To: Bill Stevenson <[EMAIL PROTECTED]> Cc: discuss-gnuradio@gnu.org 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 <[EMAIL PROTECTED]> > To: Brian Padalino <[EMAIL PROTECTED]> > Cc: Bill Stevenson <[EMAIL PROTECTED]>; discuss-gnuradio@gnu.org > 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 > > <[EMAIL PROTECTED] <mailto:[EMAIL PROTECTED]>> 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----- > > > __________________________________________________ > Do You Yahoo!? > Tired of spam? Yahoo! Mail has the best spam protection around > http://mail.yahoo.com > > > ------------------------------------------------------------------------ > > _______________________________________________ > Discuss-gnuradio mailing list > Discuss-gnuradio@gnu.org > http://lists.gnu.org/mailman/listinfo/discuss-gnuradio __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com
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