[SLS-CC] [EXTERNAL] Re: VCM technical corrigendum wording (AI_21_01)

Wed Jul 7 19:04:57 UTC 2021

Dear Andrea & S&CC WG members,

I fully support the idea of aligning all three of the “VCM suite” coding and synch standards.  As we have tried to make clear in the updates we are making to the SCCS-ARD, our analysis shows that all three of these approaches are very nearly  identical technically, with only what appear to be modest differences in how they are designed.  I do not wish to get into the whole discussion of how we arrived at this situation, only to point out that this is where we are, and that this is how we view the technical details.

In the attached slides I have  included, as pgs 2 & 3, the way that we are approaching the description of what we are calling the “VCM Suite” and how we plan to document these relative to the rest of the S&CC specs as well as how they relate to the several link layer protocols.  We reviewed these diagrams during the  “SCCS Coordination” meeting that involved SLS, SIS, CSS, and SEA WG and Area leads. And we just  discussed these during the follow up SAWG meeting that Gilles was present at.  We agreed to ask your WG  for feedback, so I  am taking this opportunity to do this.

I have also included, on pg 1, a proposed  markup of your text and Fig 2-1 from the 431.1 document.  We think it will be clearer if this figure, and the associated text, for the 431.1 (and the others in the VCM Suite) all use the identical figure, and that this figure, and the related text, clearly states that these standards only address the upper part (modulation sub-layer) of the Physical Layer and not the lower sub-layer where the 401.0 document addresses the RF frequency bands, bandwidth limitations, etc.

Please review this feedback and see if you can agree to it.  Also, it would be very useful to us if your WG would review the VCM Suite diagrams I have sent and make sure that they are technically correct.

Very best regards, Peter

From: SLS-CC <sls-cc-bounces at mailman.ccsds.org> on behalf of "Andrea Modenini (external)" <Andrea.Modenini at esa.int>
Date: Wednesday, July 7, 2021 at 9:30 AM
To: Space Link Coding & Synchronization Working Group <sls-cc at mailman.ccsds.org>
Subject: [EXTERNAL] Re: [SLS-CC] VCM technical corrigendum wording (AI_21_01)

Dear all,
 I did not receive any comment about the VCM BB from the WG.

However, considering the outcome of the DVB-S2 BB review we had today, I have myself a comment.
We aligned the SCCC and DVB-S2 BBs for having a sentence that  states the need to consider CCSDS 401 BB.
On the same line, I would propose to modify Section 2 as provided below (italic part highlights the addition).

You can find in attachment also the word file in tracking-changes mode for your convenience.

Please let me know if there is any objection, or additional point to consider, no later than 12th July EOB.
I will afterward request an Area Resolution for having the technical corrigendum.

Kind Regards,
Andrea

-------------
This Recommended Standard covers functions in both the Synchronization and Channel Coding Sublayer and the Physical Layer, the latter for what concerns the modulation schemes. CCSDS 401.0-B [5] covers additional features of the Physical Layer like frequency bands, polarizations, etc. that are not described or referenced here.

HE Space Operations for ESA - European Space Agency
Ph.D. Andrea Modenini
Communication Systems & Technologies Engineer
TT&C and PDT Systems & Techniques Section (TEC-EST)
RF Systems Division
ESTEC
Keplerlaan 1, PO Box 299
NL-2200 AG Noordwijk, The Netherlands
andrea.modenini at esa.int | www.esa.int<https://urldefense.us/v3/__http:/www.esa.int/__;!!PvBDto6Hs4WbVuu7!ZprtUS7KJ1pZpltt-3sln6BkmB--RAe2fXWcA3tewDmnD-hvb2k5FJtUbftvY77dWfg0GNDT$>
T +31 71 56 53439

From:        Andrea Modenini/estec/ESA
To:        "Space Link Coding & Synchronization Working Group" <sls-cc at mailman.ccsds.org>
Date:        10-06-21 17:28
Subject:        [SLS-CC] VCM technical corrigendum wording (AI_21_01)
________________________________

Dear colleagues,

please find enclosed the proposed changes by Jon to the VCM BB discussed during the joint C&S/RFM meeting. Please send your comments before 1st July 2021  (if any) directly to John with CC Enrico and I, and C&S mailing list.

Regards
Andrea

HE Space Operations for ESA - European Space Agency
Ph.D. Andrea Modenini
Communication Systems & Technologies Engineer
TT&C and PDT Systems & Techniques Section (TEC-EST)
RF Systems Division
ESTEC
Keplerlaan 1, PO Box 299
NL-2200 AG Noordwijk, The Netherlands
andrea.modenini at esa.int | www.esa.int<https://urldefense.us/v3/__http:/www.esa.int/__;!!PvBDto6Hs4WbVuu7!ZprtUS7KJ1pZpltt-3sln6BkmB--RAe2fXWcA3tewDmnD-hvb2k5FJtUbftvY77dWfg0GNDT$>
T +31 71 56 53439
----- Forwarded by Andrea Modenini/estec/ESA on 10-06-21 17:25 -----

From:        "Jon Hamkins" <Jon.Hamkins at jpl.caltech.edu>
To:        "Andrea Modenini (external)" <Andrea.Modenini at esa.int>, "Enrico.Vassallo at esa.int" <Enrico.Vassallo at esa.int>
Date:        09-06-21 18:48
Subject:        VCM technical corrigendum wording (AI_21_01)
________________________________

Andrea, Enrico,
Attached is a draft VCM technical corrigendum in response to AI_21_01 from the C&S WG. I completed this in consultation with Ken Andrews and John Pietras.
The main changes are in two places: Section 3.2.3 and Section 3.3.2.3 to 3.3.2.4. In summary, with the new wording the randomization is determined by VCM type:

  *   Type 1 (SCCC-like) VCM will randomize the Transfer Frames as the SCCC standard does, using the TM randomizer.
  *   Type 2 (DVB-S2-like) VCM will randomize the sliced encoder-inputs as the DVB-S2 standard does, using the ETSI DVB-S2 baseband scrambler.
This will make the CCSDS VCM standard consistent with the 131.2-B-1 and 131.3-B-1 books (SCCC and DVB-S2), with respect to randomization.
These changes are not related to randomization that occurs after encoding. The VCM protocol standard already applies post-encoding randomization, at the physical layer.
Can you forward this message to the RFM and C&S mailing lists along with your guidance on how/when to respond with comments? I believe we agreed to resolve this action by email.
     ----Jon
--
Jon Hamkins
Chief Technologist, Communications, Tracking, and Radar Division
O 818-354-4764 (preferred)   |   M 626-658-6220 (does not work at home)

JPL   |   jpl.nasa.gov [attachment "2021-05-27-VCM-431.1-technical-corrigendum-post-discussion-v3.doc" deleted by Andrea Modenini/estec/ESA]

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