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]>; [email protected]
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
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