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Re: [STDS-802-3-EPOC] Definition of Exclusion Subband

Steve,

Thanks for the response.  I wanted to bring it up early as I won't be able
to join today's call.

Regards,

Ed

From:  "Shellhammer, Steve" <sshellha@xxxxxxxxxxxxxxxx>
Date:  Tuesday, April 23, 2013 1:52 PM
To:  Edwin Mallette <edwin.mallette@xxxxxxxxx>,
"STDS-802-3-EPOC@xxxxxxxxxxxxxxxxx" <STDS-802-3-EPOC@xxxxxxxxxxxxxxxxx>
Subject:  RE: [STDS-802-3-EPOC] Definition of Exclusion Subband

Ed,
 
               I think the term ³null subcarrier² has also been used a lot,
and we probably should consider a definition for it, if we are going to use
it also.
 
               I have seen two usages of the term ³null subcarrier² and I am
not sure if we can a common understanding
 
·       A subcarrier configured to be unmodulated and its QAM value set to
zero (consistent with Exclusion subband definition)

·       A subcarrier that carries no information (as in bit loading) and can
change based on channel conditions.  Checking channel conditions may require
sending a non-zero QAM value on this subcarrier (inconsistent with Exclusion
subband)

 
Hope that helps.  Something we can also discuss on the call.
 
Steve
 

From: Edwin Mallette [mailto:edwin.mallette@xxxxxxxxx]
Sent: Tuesday, April 23, 2013 6:21 AM
To: Shellhammer, Steve; STDS-802-3-EPOC@xxxxxxxxxxxxxxxxx
Subject: Re: [STDS-802-3-EPOC] Definition of Exclusion Subband
 

Steve,

 

So we've talked about the exclusion sub band and we've also talked about
"null subcarriers."  Could you put this in context for me, what's the
difference ?  Is it simply that a null subcarrier is "modulated" but its QAM
values is set to 0 while an exclusion sub band is described as below ?

 

Exclusion Subband: A set of adjacent subcarriers, [m, m+1, m+2, ? m+k-1],
which are configure via MDIO to be unmodulated and have their QAM values set
to zero 

 

Thanks!

 

Ed

 

From: "Shellhammer, Steve" <sshellha@xxxxxxxxxxxxxxxx>
Reply-To: "Shellhammer, Steve" <sshellha@xxxxxxxxxxxxxxxx>
Date: Tuesday, April 23, 2013 10:51 AM
To: <STDS-802-3-EPOC@xxxxxxxxxxxxxxxxx>
Subject: [STDS-802-3-EPOC] Definition of Exclusion Subband

 

All,
 
               I agreed to draft a straw man definition of ³Exclusion
Subband²
 
               We can discuss, and modify as needed, this definition later
today on the RF Spectrum Ad Hoc call.
 
Steve
 
 


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