Re: [10GBT] Proposed PAM8 vs. PAM12 resolution process

[Vivek Telang <vivek@VITESSE.COM>]

George,
Yes, my code computes the Salz SNR as well as the MMSE SNR, which tells you what the implementation loss is.
Vivek


-----Original Message-----
From: stds-802-3-10gbt@ieee.org [mailto:stds-802-3-10gbt@ieee.org]On
Behalf Of George Zimmerman
Sent: Saturday, July 17, 2004 6:29 PM
To: STDS-802-3-10GBT@listserv.ieee.org
Subject: Re: [10GBT] Proposed PAM8 vs. PAM12 resolution process


Vivek -
If you can, please also include your continuous time filter assumptions - these will allow us to understand the loss due to suboptimal receiver filtering prior to the baud-rate sampler.  Better yet would be to compute the corresponding optimal DFE SNR at the sampler for the same system configuration - this will help us to get calibrated, which will be important since we're talking about fractions of a dB here.
-george
        -----Original Message-----
        From: stds-802-3-10gbt@IEEE.ORG on behalf of Vivek Telang
        Sent: Sat 7/17/2004 9:14 AM
        To: STDS-802-3-10GBT@listserv.ieee.org
        Cc:
        Subject: Re: [10GBT] Proposed PAM8 vs. PAM12 resolution process


        In addition to the optimum DFE method, I think there is value in also evaluating the performance using the finite-length MMSE equalizer method, since this will also allow us to compare estimates of the receiver complexity. I will publish my results to the reflector in the next few days.

        Regards,

        Vivek

                -----Original Message-----
                From: stds-802-3-10gbt@ieee.org [mailto:stds-802-3-10gbt@ieee.org]On Behalf Of Sailesh Rao
                Sent: Friday, July 16, 2004 6:56 AM
                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.