Re: [10GBT] Proposed PAM8 vs. PAM12 resolution process
Hiroshi,
The default cancellation parameters are in the matlab source code on the
task force web site:
http://grouper.ieee.org/groups/802/3/an/public/material/index.html
As far as the transmit PSD is concerned, please feel free to send me
what you think is optimum for the PAM12 system and I would be happy to
use that. Please note that the matlab code currently uses a flat
transmit PSD. However, I believe that the proposition before us, viz.,
"When two PAM systems have roughly the same SNR margin
(Margin(PAM8)=5.6dB, Margin(PAM12)=5.9dB), the PAM system with the
smaller number of levels (PAM8) will be fundamentally more robust
towards external noise,"
holds regardless of the transmit PSD. For instance, whatever transmit
PSD is proposed for the PAM12 system, we can always scale that in
amplitude and frequency and reuse it for the PAM8 system.
Regards,
Sailesh Rao
srao@phyten.com
>From: hiroshi takatori <hiroshi.takatori@KEYEYE.NET>
>Reply-To: "IEEE P802.3an" <STDS-802-3-10GBT@listserv.ieee.org>
>To: STDS-802-3-10GBT@listserv.ieee.org
>Subject: Re: [10GBT] Proposed PAM8 vs. PAM12 resolution process
>Date: Fri, 16 Jul 2004 23:09:07 -0700
>
>Sailesh,
>
>Please, define default cancellation parameters and necessary parameters
>to create transmit PSDs for both PAM8 and 12.
>
>Hiroshi
>
>KeyEye
>
>________________________________
>
>From: stds-802-3-10gbt@IEEE.ORG [mailto:stds-802-3-10gbt@IEEE.ORG] On
>Behalf Of Sailesh Rao
>Sent: Friday, July 16, 2004 9:01 PM
>To: STDS-802-3-10GBT@listserv.ieee.org
>Subject: [10GBT] Proposed PAM8 vs. PAM12 resolution process
>
>
>
>All,
>
>
>
>I would like to propose the following process for resolving the
>robustness of PAM8 vs. PAM12 towards external noise.
>
>
>
>1. Compute the Optimum DFE SNR Margin for PAM8 and PAM12 using
>solarsep_varlen7a.m for Models 1 and 3 using default cancellation
>parameters and -150dBm/Hz background noise.
>
>
>
>2. Compute the input-referred RMS noise power at the slicer by
>integrating the residual noise in the Optimum DFE solution. I volunteer
>to add this code to solarsep_varlen7a.m unless someone else wants to do
>so.
>
>
>
>3. Compute the input-referred external noise power that can be
tolerated
>for a BER of 1E-12 for both systems using the results from (1) and (2)
>above. I volunteer to add this code to solarsep_varlen7a.m unless
>someone else wants to do so.
>
>
>
>Regards,
>
>Sailesh Rao.
>
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