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]> 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
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