[ibis-macro] Re: AMI spec. intent, re: aggressors/xtalk?
- From: David Banas <DBanas@xxxxxxxxxx>
- To: "'msteinb@xxxxxxxxxx'" <msteinb@xxxxxxxxxx>, "'ibis-macro@xxxxxxxxxxxxx'" <ibis-macro@xxxxxxxxxxxxx>
- Date: Tue, 8 May 2012 09:14:03 -0700
Mike,
Thanks for your response to this. I have the following question, which I hope
you'll have time to consider:
When we pass a matrix into the `impulse_matrix' parameter of a Rx model
`AMI_Init' function, we expect that it will apply the same `processing' to all
vectors of the matrix; right? After all, the physical Rx has only 2 balls with
which to sense the signal impinging upon it. So, it has no way of separating
the contributions of victim and aggressors in the received signal. So, to have
the Rx algorithmic model apply different processing to the different vectors of
the matrix wouldn't make sense; would it?
Thanks,
-db
From: ibis-macro-bounce@xxxxxxxxxxxxx [mailto:ibis-macro-bounce@xxxxxxxxxxxxx]
On Behalf Of Mike Steinberger
Sent: Thursday, May 03, 2012 6:19 PM
To: ibis-macro@xxxxxxxxxxxxx
Subject: [ibis-macro] Re: AMI spec. intent, re: aggressors/xtalk?
Dave-
Your first set of presumptions is correct. The EDA tool calculates the impulse
response from the aggressor Tx to the victim Rx and places that in the second
row of impulse_matrix.
The other calculation you suggest would be incorrect because the signal from
the victim transmitter is different from the signal from the aggressor
transmitter, so you can't just add the impulse responses from the two sources
together.
If Va(t) is the aggressor transmitter signal, Vv(t) is the victim transmitter
signal, ha(t) is the impulse response from the aggressor transmitter to the
receiver and hv(t) iis the impulse response from the victim transmitter to the
receiver, then the signal Vr(t) at the receiver is
Vr(t) = Va(t) x ha(t) + Vv(t) x hv(t)
which is not equal to
Vv(t) x (ha(t) + hv(t))
Hope this helps.
Mike Steinberger
On 5/3/2012 9:05 PM, David Banas wrote:
Hi experts,
If I'm using a AMI-compliant EDA tool, in order to perform a channel
simulation, which includes cross-talk from an aggressor, such that my topology
looks something like this:
____________ _________ ____________
| Vic AMI Tx | => | vic.s4p | => | Vic AMI Rx |
____________ _________ ____________
____________ _________ ____________
| Agg AMI Tx | => | agg.s4p | => | Agg AMI Rx |
____________ _________ ____________
And if `agg.s4p' actually represents a measurement of the scattering between
the aggressor Tx output and the victim Rx input.
Then is it the intent of the AMI spec. that the EDA tool should calculate the
impulse response of the aggressor channel, including any contribution made by
the aggressor AMI Tx model's `AMI_Init' function, and feed that into the
`AMI_Init' function of the victim AMI Rx model, by placing it in the second row
of the matrix that it sends into that function, via the `impulse_matrix'
parameter, assuming that the value of the Rx *.AMI file's `Max_Init_Aggressors'
parameter is, at least, 1?
If so, what is the utility of this approach over having the EDA tool sum the
two impulse responses and feed the resultant vector into the `AMI_Init'
function of the victim Rx model?
Thanks,
David Banas
Sr. Member Technical Staff
Altera<http://www.altera.com/>
+1-408-544-7667 - desk
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