[SLS-CC] Fw: GSFC's Response to C&S WG Action Items

[Massimo.Bertinelli at esa.int]

Dear WG members,

please find below the feedback provided by NASA/GSFC for some of the 
latest AIs.
For AI-20-08, deadline is tomorrow so I will still wait one day before 
closing it.
AI-20-07 and -09 have a Spring 2021 deadline.

Best regards,
Massimo


---------------------------------------------------
Massimo Bertinelli
Communication Systems Engineer
ESA/Estec

Tel. +31 (0)71 5653435
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----- Forwarded by Massimo Bertinelli/estec/ESA on 14/12/2020 10:04 -----

From:   "Lee, Wing-tsz (GSFC-5670)" <wing-tsz.lee-1 at nasa.gov>
To:     "Massimo.Bertinelli at esa.int" <Massimo.Bertinelli at esa.int>
Cc:     "Fong, Wai H. (GSFC-5670)" <wai.h.fong at nasa.gov>, "Rodriguez, 
Shannon (GSFC-5670)" <shannon.rodriguez-1 at nasa.gov>, "Sank, Victor J. 
(GSFC-567.0)[SCIENCE SYSTEMS AND APPLICATIONS INC]" 
<victor.j.sank at nasa.gov>, "Huang, Wei-Chung. (GSFC-5670)" 
<weichung.huang at nasa.gov>
Date:   11/12/2020 20:00
Subject:        GSFC's Response to C&S WG Action Items



Massimo,
 
Below is GSFC’s response to the action items from the last C&S remote 
working group meeting:
 
AI-20-07             Considering extending the simulator channel model 
work in order to establish procedures for the end-to-end assessment of 
coding proposals
GSFC agrees
 
AI-20-08                 Provide comment on the (ESA) proposal for a 
channel model for the validation of (turbo) channel interleavers
We currently don’t have any mission that experiences the solar 
scintillation phenomenon and therefore do not have any comments on the 
channel model at this time.
 
AI-20-09                 Verify the (legacy) needs of the ISS in term of 
coding
ISS uses RS+CC but the CC is done on mission unique equipment at the 
ground stations. We don't see a need to include the CC as a standard for 
the future.
 
(At CCSDS ground stations, up link is not a continuous flow of data as the 
down link is.  At the ground station an idle is continuously transmitted 
(CCSDS PLOP-2) until the station receives a command.  The idle is 
interrupted and the command is inserted in the up link path.  ISS uses RS 
and convo on up link.  Since convo is not a block code or a data block 
like the CLTU, the processing must be handled differently from the normal 
command methods.  The convolutional coding is not done on the command at 
the MOC.  In the ISS case we are told that the convo code is applied at 
the TDRSS ground station.  If CCSDS was to adopt this, it would be a new 
thing for ground stations.)
 
Thank you,
GSFC C&S WG Members (Shannon, Wai, Victor, Wing)
 


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