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<p>Nicolò, and all,<br>
</p>
<p>We agree that we all can run simulations using the model
described on either p. 2 or p. 7 of the updated presentation
Geraldine sent out, and scale from either model to the other
afterwards.</p>
<p>We also agree that our top priorities do not include computing
the mutual information at this time, although it is an interesting
idea.<br>
</p>
<p>Our top priority will be simulating the codes according to the p.
2/p. 7 model, in a non-fading environment.</p>
<p>Let's plan to discuss the channel interleaver next Tuesday. To
simplify things, I suggest that we consider just one (N,B)
interleaver for each fading case we want to consider, instead of
three. We just need to make it sufficiently long to overcome the
fade -- e.g., we could pick it to be some multiple of the
coherence time of the fade. (I don't think we learn much from
also simulating an insufficiently long interleaver, since all
codes will fail with it; and likewise, the performance of a
longer-than-necessary interleaver will not perform substantially
different than the sufficiently long interleaver.) If we had to
pick just one fading case, case A might not be the best one, since
that is a mild case. A, D, E, and H show progressively more
difficulty.<br>
</p>
<p> ----Jon<br>
</p>
<div class="moz-signature"><strong>Jon Hamkins</strong><br>
Lead Technologist<br>
33 | Communications, Tracking, and Radar Division<br>
<strong>O</strong> 818-354-4764 | <strong>M</strong>
626-658-6220 <br>
<br>
<strong>JPL</strong> | jpl.nasa.gov
</div>
<div class="moz-cite-prefix">On 4/28/2020 8:33 AM, Nicolo Mazzali
(external) wrote:<br>
</div>
<blockquote type="cite"
cite="mid:32623_1588087987_5EA84CAF_32623_1_3_OFFBDC9911.26238008-ONC1258558.0051F2A9-C1258558.00556BF1@esa.int">
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<span style=" font-size:10pt;font-family:sans-serif">Dear All, </span>
<br>
<br>
<span style=" font-size:10pt;font-family:sans-serif">Thanks a lot
to
Dirk and Géraldine for the very useful contribution.</span>
<br>
<span style=" font-size:10pt;font-family:sans-serif">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 either way.</span>
<br>
<br>
<span style=" font-size:10pt;font-family:sans-serif">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 interleaver. </span>
<br>
<span style=" font-size:10pt;font-family:sans-serif">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 rule-of-thumb dimensioning.</span>
<br>
<br>
<span style=" font-size:10pt;font-family:sans-serif">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.</span>
<br>
<span style=" font-size:10pt;font-family:sans-serif"><br>
Kind regards,</span>
<br>
<p style="margin-top:0px;margin-Bottom:0px"><span style="
font-size:8pt;color:#808080;font-family:Verdana"><b>Modis
for ESA - European Space Agency</b></span><span style="
font-size:12pt;font-family:Tms Rmn">
</span><span style="
font-size:8pt;color:#00a1e0;font-family:Verdana"><br>
<br>
Nicolò Mazzali, PhD </span><span style="
font-size:8pt;color:#808080;font-family:Verdana"><br>
Communication Systems & Technologies Engineer</span><span
style=" font-size:12pt;font-family:Tms Rmn">
</span><span style="
font-size:8pt;color:#808080;font-family:Verdana"><br>
<br>
Telecommunications Section (TEC-ESC)</span><span style="
font-size:12pt;font-family:Tms Rmn">
</span><span style="
font-size:8pt;color:#808080;font-family:Verdana"><br>
Radio Frequency Systems Division (TEC-ES)</span></p>
<p style="margin-top:0px;margin-Bottom:0px"><span style="
font-size:8pt;color:#808080;font-family:Verdana">Directorate
of Technology, Engineering & Quality (D/TEC)<b><br>
<br>
<br>
ESTEC</b><br>
Keplerlaan 1, PO Box 299<br>
NL-2200 AG Noordwijk, The Netherlands</span><span style="
font-size:8pt;color:#0082bf;font-family:Verdana"><u><br>
</u></span><a href="mailto:nicolo.mazzali@esa.int"
moz-do-not-send="true"><span style="
font-size:8pt;color:#0082bf;font-family:Verdana"><u>nicolo.mazzali@esa.int</u></span></a><span
style=" font-size:8pt;color:#808080;font-family:Verdana">
| </span><a href="http://www.esa.int/" moz-do-not-send="true"><span
style=" font-size:8pt;color:#8f8f8f;font-family:Verdana"><u>www.esa.int</u></span></a><span
style=" font-size:8pt;color:#808080;font-family:Verdana"><br>
T +31 71 56 53215</span></p>
<br>
<br>
<br>
<br>
<span style=" font-size:9pt;color:#5f5f5f;font-family:sans-serif">From:
</span><span style="
font-size:9pt;font-family:sans-serif"><a class="moz-txt-link-rfc2396E" href="mailto:Dirk.Giggenbach@dlr.de"><Dirk.Giggenbach@dlr.de></a></span>
<br>
<span style=" font-size:9pt;color:#5f5f5f;font-family:sans-serif">To:
</span><span style="
font-size:9pt;font-family:sans-serif"><a class="moz-txt-link-rfc2396E" href="mailto:Jon.Hamkins@jpl.caltech.edu"><Jon.Hamkins@jpl.caltech.edu></a></span>
<br>
<span style=" font-size:9pt;color:#5f5f5f;font-family:sans-serif">Cc:
</span><span style="
font-size:9pt;font-family:sans-serif"><a class="moz-txt-link-abbreviated" href="mailto:SLS-OPT@mailman.ccsds.org">SLS-OPT@mailman.ccsds.org</a></span>
<br>
<span style=" font-size:9pt;color:#5f5f5f;font-family:sans-serif">Date:
</span><span style="
font-size:9pt;font-family:sans-serif">23/04/2020
20:04</span>
<br>
<span style=" font-size:9pt;color:#5f5f5f;font-family:sans-serif">Subject:
</span><span style="
font-size:9pt;font-family:sans-serif">Re:
[SLS-OPT] O3K channel model</span>
<br>
<span style=" font-size:9pt;color:#5f5f5f;font-family:sans-serif">Sent
by: </span><span style="
font-size:9pt;font-family:sans-serif">"SLS-OPT"
<a class="moz-txt-link-rfc2396E" href="mailto:sls-opt-bounces@mailman.ccsds.org"><sls-opt-bounces@mailman.ccsds.org></a></span>
<br>
<hr noshade="noshade">
<br>
<br>
<p style="margin-top:0px;margin-Bottom:0px"><span style="
font-size:11pt;color:#004080;font-family:Calibri">Hi
Jon,</span></p>
<p style="margin-top:0px;margin-Bottom:0px"><span style="
font-size:11pt;color:#004080;font-family:Calibri"> </span></p>
<p style="margin-top:0px;margin-Bottom:0px"><span style="
font-size:11pt;color:#004080;font-family:Calibri">we
do not have data APD-RFEs for that low rate which we could
test/measure.</span></p>
<p style="margin-top:0px;margin-Bottom:0px"><span style="
font-size:11pt;color:#004080;font-family:Calibri">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.</span></p>
<p style="margin-top:0px;margin-Bottom:0px"><span style="
font-size:11pt;color:#004080;font-family:Calibri"><br>
These values seem close to best compared to other receivers:</span></p>
<p style="margin-top:0px;margin-Bottom:0px"><span style="
font-size:11pt;color:#004080;font-family:Calibri">Responsivity=94MV/W
, I guess that includes Amplification of M=10, so TIA would
be ~9MOhm </span></p>
<p style="margin-top:0px;margin-Bottom:0px"><span style="
font-size:11pt;color:#004080;font-family:Calibri">NEP=32fW/sqrt(Hz)
- referred noise density of 0.3E-12 A/sqrt(Hz) or
3µV/sqrt(Hz)
</span></p>
<p style="margin-top:0px;margin-Bottom:0px"><a
href="https://www.lasercomponents.com/de-en/product/apd-receivers/"
moz-do-not-send="true"><span style="
font-size:11pt;color:blue;font-family:Calibri"><u>https://www.lasercomponents.com/de-en/product/apd-receivers/</u></span></a><span
style=" font-size:11pt;color:#004080;font-family:Calibri">
</span></p>
<p style="margin-top:0px;margin-Bottom:0px"><span style="
font-size:11pt;color:#004080;font-family:Calibri"> </span></p>
<p style="margin-top:0px;margin-Bottom:0px"><span style="
font-size:11pt;color:#004080;font-family:Calibri">Hope
that helps,</span></p>
<p style="margin-top:0px;margin-Bottom:0px"><span style="
font-size:11pt;color:#004080;font-family:Calibri"> </span></p>
<p style="margin-top:0px;margin-Bottom:0px"><span style="
font-size:11pt;color:#004080;font-family:Calibri">Dirk</span></p>
<p style="margin-top:0px;margin-Bottom:0px"><span style="
font-size:11pt;color:#004080;font-family:Calibri"> </span></p>
<p style="margin-top:0px;margin-Bottom:0px"><span style="
font-size:11pt;color:#004080;font-family:Calibri"> </span></p>
<p style="margin-top:0px;margin-Bottom:0px"><span style="
font-size:12pt;font-family:Times New Roman"> </span></p>
<p style="margin-top:0px;margin-Bottom:0px"><span style="
font-size:10pt;font-family:Tahoma"><b>Von:</b>
SLS-OPT [</span><a
href="mailto:sls-opt-bounces@mailman.ccsds.org"
moz-do-not-send="true"><span style="
font-size:10pt;font-family:Tahoma">mailto:sls-opt-bounces@mailman.ccsds.org</span></a><span
style=" font-size:10pt;font-family:Tahoma">]
<b>Im Auftrag von </b>Jon Hamkins via SLS-OPT<b><br>
Gesendet:</b> Mittwoch, 15. April 2020 17:20<b><br>
An:</b> <a class="moz-txt-link-abbreviated" href="mailto:SLS-OPT@mailman.ccsds.org">SLS-OPT@mailman.ccsds.org</a><b><br>
Betreff:</b> [SLS-OPT] O3K channel model</span></p>
<p style="margin-top:0px;margin-Bottom:0px"><span style="
font-size:12pt;font-family:Times New Roman"> </span></p>
<br>
<span style=" font-size:12pt;font-family:Times New Roman">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.</span>
<br>
<span style=" font-size:12pt;font-family:Times New Roman">A few
notes:</span>
<ul>
<li><span style=" font-size:12pt;font-family:Times New Roman">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.</span>
</li>
<li><span style=" font-size:12pt;font-family:Times New Roman">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?</span>
</li>
<li><span style=" font-size:12pt;font-family:Times New Roman">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.</span>
</li>
<li><span style=" font-size:12pt;font-family:Times New Roman">I
have included
the fading parameter as well. Just set rho=1 if you want no
fading.</span></li>
</ul>
<span style=" font-size:12pt;font-family:Times New Roman">
----Jon</span>
<p style="margin-top:0px;margin-Bottom:0px"><span style="
font-size:12pt;font-family:Times New Roman">--
<b><br>
Jon Hamkins</b><br>
Lead Technologist<br>
33 | Communications, Tracking, and Radar Division<b><br>
O</b> 818-354-4764 | <b>M</b> 626-658-6220 <br>
<b><br>
JPL</b> | jpl.nasa.gov </span></p>
<br>
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