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<title>CCSDS 401.0-P-25.1, Radio Frequency and Modulation Systems—Part 1: Earth Stations and Spacecraft (Red Sheets, Issue 25.1, February 2016)</title>
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Enrico,</div>
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My comments are:</div>
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<li><font face="Calibri,sans-serif">ESA-MB-01: The addition of proposed text to specify pi/2-BPSK symbols is inconsistent with the rest of the text that recommends only QPSK, OQPSK, 8PSK, 16APSK, 32APSK, or 64APSK, modulations. In addition, since pi/2-BPSK
only exist in CCSDS 131.2-B-1 and CCSDS 131.2-B-1 and not in 401.0-B, it has not been studied formally as a modulation technique where we would need evaluate the modulation and demodulation complexities. I would reject this RID.</font></li><li>ESA-SM-01: The inclusion of 10Hz-100Hz specification of the phase noise mask is necessary because there is no lower bound on symbol rate of the recommendation. Recommends (2) in fact specifies QPSK, OQPSK, or 8PSK modulations below 10 Ms/s where there
could be significant AWGN noise power. Missions trying to operate with very narrow of loop bandwidths to mitigate AWGN noise need to know that they could increase phase noise. I would reject this RID as well.</li></ol>
<div>The rest I agree with.</div>
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<div>Regards,</div>
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<p style="margin: 0px; font-size: 14px; ">Wai Fong, Ph.D.</p>
<p style="margin: 0px; font-size: 14px; ">Communications Engineer</p>
<p style="margin: 0px; font-size: 14px; ">Flight Microwave and Telecommunications Systems Branch</p>
<p style="margin: 0px; font-size: 14px; ">NASA Goddard Space Flight Center</p>
<p style="margin: 0px; font-size: 14px; ">Code 567</p>
<p style="margin: 0px; font-size: 14px; ">Greenbelt, MD 20771</p>
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<span style="font-weight:bold">From: </span><<a href="mailto:sls-rfm-bounces@mailman.ccsds.org">sls-rfm-bounces@mailman.ccsds.org</a>> on behalf of Enrico Vassallo <<a href="mailto:Enrico.Vassallo@esa.int">Enrico.Vassallo@esa.int</a>><br>
<span style="font-weight:bold">Date: </span>Thursday, May 19, 2016 at 9:49 AM<br>
<span style="font-weight:bold">To: </span>"<a href="mailto:sls-rfm@mailman.ccsds.org">sls-rfm@mailman.ccsds.org</a>" <<a href="mailto:sls-rfm@mailman.ccsds.org">sls-rfm@mailman.ccsds.org</a>><br>
<span style="font-weight:bold">Cc: </span>"<a href="mailto:Marco.Lanucara@esa.int">Marco.Lanucara@esa.int</a>" <<a href="mailto:Marco.Lanucara@esa.int">Marco.Lanucara@esa.int</a>>, "<a href="mailto:Salvador.Marti@esa.int">Salvador.Marti@esa.int</a>" <<a href="mailto:Salvador.Marti@esa.int">Salvador.Marti@esa.int</a>><br>
<span style="font-weight:bold">Subject: </span>[Sls-rfm] CCSDS Review of CCSDS 401.0-P-25.1, Radio Frequency and Modulation SystemsPart 1: Earth Stations and Spacecraft
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<div><font size="2" face="sans-serif">Dear All,</font> <br>
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<font size="2" face="sans-serif">this is to inform you of the outcome of the above review.</font><br>
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<font size="2" face="sans-serif">CNES, DLR, INPE and JAXA concurred with the pink sheets.</font><br>
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<font size="2" face="sans-serif">ESA and EUM generated 3 RIDs each. They are attached for your review.</font><br>
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<font size="2" face="sans-serif">My proposal is:</font> <br>
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<font size="2" face="sans-serif">1) ESA-MB-01 </font><br>
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<font size="2" face="sans-serif">We were initially thinking of adding Pi/2-BPSK symbols definition as an additional recommendation in 401. However, it makes more sense to have it inside recommendation 2.4.23 that becomes self standing.</font><br>
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<font size="2" face="sans-serif">Disposition: ACCEPTED</font> <br>
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<font size="2" face="sans-serif">2) ESA-ML-01 </font><br>
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<font size="2" face="sans-serif">Makes the recommendation ECSS compatible (specifications cannot be in footnotes).</font><br>
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<font size="2" face="sans-serif">Disposition: ACCEPTED</font> <br>
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<font size="2" face="sans-serif">3) ESA-SM-01</font> <br>
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<font size="2" face="sans-serif">The phase noise between 10 and 100 Hz is not important for this kind of missions with at least 10 Ms/s (even for 1 Ms/s that is behind recommends (2)).</font><br>
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<font size="2" face="sans-serif">Disposition: ACCEPTED</font> <br>
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<font size="2" face="sans-serif">4) EUM-XE-001</font> <br>
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<font size="2" face="sans-serif">Editorial clarification.</font> <br>
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<font size="2" face="sans-serif">Disposition: ACCEPTED</font> <br>
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<font size="2" face="sans-serif">5) EUM-XE-002</font> <br>
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<font size="2" face="sans-serif">Editorial.</font> <br>
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<font size="2" face="sans-serif">Disposition: ACCEPTED</font> <br>
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<font size="2" face="sans-serif">6) EUM-XE-003</font> <br>
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<font size="2" face="sans-serif">Almost editorial. In the ESA implementation, pilots are used also for lower order modulations but the suggestion of this RID is reasonable.</font><br>
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<font size="2" face="sans-serif">Disposition: ACCEPTED</font> <br>
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<font size="2" face="sans-serif">If I do not hear from you <b><u>by June 10</u></b>, I will assume that the WG concurs with my proposed disposition and will send disposed RIDs and final version of the recommendation to the CCSDS management for approval.
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<font size="2" face="sans-serif">Regards, Enrico</font> <br>
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