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Re: [10GBT] THP Fixed Set TF



Hi Albert,


So far several precoder proposals have been presented: one is your
proposal and another one is Ungerboeck's.

They assume different Rx Architectures, namely analog high pass boosting
is used in yours but not in Ungerboeck's. I think we need to assess the
performance loss of your precoders with a receiver that does no boosting
and the performance of Ungerboeck precoders with a receiver that
includes boosting.

This will show if setting the precoder coefficients limits the options
for Rx implementation in which case we should consider making the
precoder programmable.

Regards,

Pedro





-----Original Message-----
From: Albert Vareljian [mailto:albertv@ieee.org]
Sent: Wednesday, December 15, 2004 7:36 PM
To: Reviriego, Pedro (Pedro); STDS-802-3-10GBT@listserv.ieee.org
Subject: Re: [10GBT] THP Fixed Set TF

Pedro,

I did not use the Rx filter you mentioned below primarily
due to aliasing associated with its not very steep roll-off.
(Also pointed by Gottfried during Nov meeting.)

Regards,

Albert




Reviriego, Pedro (Pedro) wrote:

>Albert,
>
>Have you tried using the receive filter presented in
"ungerboeck_1_1104"
>with your precoder? If so what kind of performance do you get?
>
>Regards,
>
>Pedro
>
>-----Original Message-----
>From: IEEE P802.3an Reflector [mailto:stds-802-3-10gbt@IEEE.ORG] On
>Behalf Of Albert Vareljian
>Sent: Saturday, December 11, 2004 2:14 AM
>To: STDS-802-3-10GBT@listserv.ieee.org
>Subject: [10GBT] THP Fixed Set TF
>
>Dear All,
>
>Further to our Nov meeting discussions on fixed THP TF set,
>pls find for evaluation attached material outlining 3 TF sets.
>This is aimed in combination with THP bypass option -- i.e.
>four THP modes in total.
>
>All simulations were performed in time domain as per
>"vareljian_1_1104" and showed reasonably good performance
>with relatively short (24-Tap and shorter) FFE. Performance
>impact due to 7-bit coefficient quantization effects was
>found to be very small.
>
>Similar results were observed in simulations for a 2nd order
>Tx LPF @ 200 MHz as per "ungerboeck_1_1104" in place of the
>3rd order Tx LPF @ 400 MHz.
>
>Hope, the posting will stimulate discussion on our, otherwise
>relatively quiet, reflector.
>
>Happy Holidays to everyone.
>
>Regards,
>
>Albert
>
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