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<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US">Dear All,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US">Thank you Nicolo for your comments.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US">I will try to prepare some inputs for the discussion tomorrow.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US">I wanted to upload a new version of the pink sheet on the cwe in the folder of the teleconference of 23/02/2020, but
it seems that the ccsds website is experiencing some trouble this morning. I will try later in the day.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US">This new version includes modifications following the feedback we received from the OPT group and also from some industrials.
They are mainly:<o:p></o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-18.0pt;mso-list:l0 level1 lfo1"><![if !supportLists]><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US"><span style="mso-list:Ignore">-<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US">Simplification of the slicer: no zero fill and no alignment of the slicer with the transfert frame. It comes
from the will to reduce the complexity at the coding&synch layer. The link initialization and proper closure have to be handled by the transfer frame layer by beginning and closing a link with IDLE packets for example. For non deep-space applications, it is
acceptable to have 1 second of idle packets transferred at the beginning and end of a link<o:p></o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-18.0pt;mso-list:l0 level1 lfo1"><![if !supportLists]><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US"><span style="mso-list:Ignore">-<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US">The LDPC chapter has be rewritten to make more comprehensive for non-coding experts. The steps to construct
the matrix are now described, and the encoding process has also be added.<o:p></o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-18.0pt;mso-list:l0 level1 lfo1"><![if !supportLists]><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US"><span style="mso-list:Ignore">-<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US">Initialization sequence of the pseudorandomizer has been given to avoid misinterpretation<o:p></o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-18.0pt;mso-list:l0 level1 lfo1"><![if !supportLists]><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US"><span style="mso-list:Ignore">-<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US">The physical layer frame has been also modified. And it is a main update to improve the synchronization process.
In the previous version, there was only one synchmarker per interleaved frame. This was a weakness since in case of loss of lock, the reacquisition time could be long. It is now proposed to insert a synchmarker at a constant spacing (defined as a managed parameter)
to reduce the reacquisition time. The spacing can be set by the user to range from one codeword length (what is usually done in CCSDS standards) to a completed interleaved block (which is what I presented at the last telco). This new scheme appears to be much
robust<o:p></o:p></span></p>
<p class="MsoListParagraph"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US">The definitions of frame, subframe and idle fame are also more precisely written.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US">Kind Regards,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US">Cheers,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US">Geraldine<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">De :</span></b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"> SLS-OPT <sls-opt-bounces@mailman.ccsds.org>
<b>De la part de</b> Nicolo Mazzali (external)<br>
<b>Envoyé :</b> mardi 16 février 2021 17:09<br>
<b>À :</b> SLS-OPT@mailman.ccsds.org<br>
<b>Objet :</b> [SLS-OPT] ESA's comments on CNES O3K pink sheets<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal" style="margin-bottom:12.0pt"><span style="font-size:10.0pt;font-family:"Arial",sans-serif">Dear All,
</span><br>
<br>
<span style="font-size:10.0pt;font-family:"Arial",sans-serif">In ESA we have spent some time to go through the O3K coding & sync proposal from CNES, and we find it very clear and comprehensive as it addresses the FEC coding, the channel interleaving, the VDR,
and the framing in one single document.</span> <br>
<span style="font-size:10.0pt;font-family:"Arial",sans-serif">We have reported our comments in the .doc file attached below: some are just clarifications, some others are meant to stimulate the discussion during the next meeting.</span>
<br>
<br>
<span style="font-size:10.0pt;font-family:"Arial",sans-serif">Kind regards, </span>
<br>
<br>
<o:p></o:p></p>
<p style="margin:0cm;margin-bottom:.0001pt"><b><span style="font-size:8.0pt;font-family:"Verdana",sans-serif;color:gray">Modis for ESA - European Space Agency</span></b><span style="font-family:"Tms Rmn",serif">
</span><span style="font-size:8.0pt;font-family:"Verdana",sans-serif;color:#00A1E0"><br>
<br>
Nicolò Mazzali, PhD </span><span style="font-size:8.0pt;font-family:"Verdana",sans-serif;color:gray"><br>
Communication Systems & Technologies Engineer</span><span style="font-family:"Tms Rmn",serif">
</span><span style="font-size:8.0pt;font-family:"Verdana",sans-serif;color:gray"><br>
<br>
Telecommunications Section (TEC-ESC)</span><span style="font-family:"Tms Rmn",serif">
</span><span style="font-size:8.0pt;font-family:"Verdana",sans-serif;color:gray"><br>
Radio Frequency Systems Division (TEC-ES)</span><o:p></o:p></p>
<p style="margin:0cm;margin-bottom:.0001pt"><span style="font-size:8.0pt;font-family:"Verdana",sans-serif;color:gray">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><u><span style="font-size:8.0pt;font-family:"Verdana",sans-serif;color:#0082BF"><br>
</span></u><a href="mailto:nicolo.mazzali@esa.int"><span style="font-size:8.0pt;font-family:"Verdana",sans-serif;color:#0082BF">nicolo.mazzali@esa.int</span></a><span style="font-size:8.0pt;font-family:"Verdana",sans-serif;color:gray"> |
</span><a href="http://www.esa.int/"><span style="font-size:8.0pt;font-family:"Verdana",sans-serif;color:#8F8F8F">www.esa.int</span></a><span style="font-size:8.0pt;font-family:"Verdana",sans-serif;color:gray"><br>
T +31 71 56 53215</span><o:p></o:p></p>
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<pre>personal data, in case of data privacy queries, please contact the ESA Data Protection Officer (<a href="mailto:dpo@esa.int">dpo@esa.int</a>).<o:p></o:p></pre>
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