[SLS-OPT] O3K channel model
Nicolo Mazzali (external)
Nicolo.Mazzali at esa.int
Tue Apr 28 15:33:02 UTC 2020
Thanks a lot to Dirk and Géraldine for the very useful contribution.
In the past we used the "ampère model" (in slide 7 from Géraldine), and,
as Géraldine correctly pointed out, it's just a matter of scaling to move
from that to the "photons per bit model" (slide 8). So for ESA it's fine
I think that the last details that we need to agree upon before running
the new simulation campaign concern the fading and the interleaver
dimensioning. In our opinion it is important to include them both in the
assessment, since in past meetings it was shown that there is an
intertwined relationship between the code, the channel, and the
For simplicity we propose to use fading A from the DLR, leaving the
performance assessment with the other time series for the green book. On
the interleaver dimensioning, since it depends both on the symbol rate and
the fading, I think that we should pick 3 different (N,B) values.
Honestly, I don't think we have the time (nor the need) for an accurate
optimization of these parameters, so we might well live with a
Finally, concerning Géraldine's request for the mutual information, we
still don't think that such investigation would be worth the required
effort. This applies in particular to fading channels, where the
computation of the mutual information is not as straightforward as on the
AWGN channel, especially when the fading is not generated according to a
given statistical model but numerically by means of a time series. Also,
including the interleaver would further complicate the analysis. On top of
this, we are not using Matlab for our simulations, and including the
mutual information in our simulator would inevitably delay the delivery of
the results of the new simulation campaign.
Modis for ESA - European Space Agency
Nicolò Mazzali, PhD
Communication Systems & Technologies Engineer
Telecommunications Section (TEC-ESC)
Radio Frequency Systems Division (TEC-ES)
Directorate of Technology, Engineering & Quality (D/TEC)
Keplerlaan 1, PO Box 299
NL-2200 AG Noordwijk, The Netherlands
nicolo.mazzali at esa.int | www.esa.int
T +31 71 56 53215
From: <Dirk.Giggenbach at dlr.de>
To: <Jon.Hamkins at jpl.caltech.edu>
Cc: SLS-OPT at mailman.ccsds.org
Date: 23/04/2020 20:04
Subject: Re: [SLS-OPT] O3K channel model
Sent by: "SLS-OPT" <sls-opt-bounces at mailman.ccsds.org>
we do not have data APD-RFEs for that low rate which we could
I checked some datasheets, the one coming closest to 1.22Mbps is the
LaserComponents IAG350H1D –APD Receiver with 1MHz Bandwidth and 350µm APD.
They don’t show dark current in the DS.
These values seem close to best compared to other receivers:
Responsivity=94MV/W , I guess that includes Amplification of M=10, so
TIA would be ~9MOhm
NEP=32fW/sqrt(Hz) - referred noise density of 0.3E-12 A/sqrt(Hz) or
Hope that helps,
Von: SLS-OPT [mailto:sls-opt-bounces at mailman.ccsds.org] Im Auftrag von Jon
Hamkins via SLS-OPT
Gesendet: Mittwoch, 15. April 2020 17:20
An: SLS-OPT at mailman.ccsds.org
Betreff: [SLS-OPT] O3K channel model
Attached is the O3K channel model we discussed yesterday. It also
contains a suggestion for how to state the O3K coding performance. I
welcome your comments. If we can agree to the model in the next week or
so, each agency may be able to begin simulating with it and discuss some
initial results at the May teleconferences.
A few notes:
I am suggesting we study 10 Gsps, 78.125 Msps, and 1.22 Mbps, since those
include the highest and lowest data rates and one in the middle.
I don't have a good suggestion for the TIA noise density at 1.22 Msps.
Dirk, would you be able to supply a number?
I have algebraically simplified the expressions for the means and
variances. You can compare the model to the expressions Dariush presented
on yesterday (p. 5), and check my algebra.
I have included the fading parameter as well. Just set rho=1 if you want
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