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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 19:05:35 -0700 (PDT)

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!!!


----- 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

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> 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
Version: GnuPG v1.4.8 (Darwin)


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