[SLS-CC] [Sls-slp] Making LDPC coding a work item in the C&S WG

Kazz, Greg J (313B) greg.j.kazz at jpl.nasa.gov
Thu Feb 18 19:43:27 UTC 2010


Thanks for your quick response. I’m looking forward to responses from other agencies including ESA as well.
Regarding the NASA Electra’s implementation with the LDPC upgrade, one can turn the LDPC functionality off,  without effecting any of the standard Prox-1 functionality.


From: Gian.Paolo.Calzolari at esa.int [mailto:Gian.Paolo.Calzolari at esa.int]
Sent: Thursday, February 18, 2010 7:46 AM
To: SLS Channel Coding Working Groups; Kazz, Greg J (313B)
Cc: sls-ngu at mailman.ccsds.org; sls-slp at mailman.ccsds.org
Subject: [SLS-CC] [Sls-slp] Making LDPC coding a work item in the C&S WG

        your soliciting is justified and I want to confirm you that the matter is being discussed in ESA. I hope the same applies to other Agencies represented in the C&S WG.
Unfortunately I cannot give you a consolidated position yet.

I can however give you a couple of preliminary comments on the input paper.

In the following sentence there is a mistake:

 Several NASA Programs i.e., Program Constellation and the Mars Program are requiring the use of LDPC codes for their Proximity Links:
• Constellation rendezvous links (e.g., Orion-ISS)
• MSL to MRO link at Mars (2011)
• LDCM (Landsat Data Continuity Mission, 2013)
• GOES (Geostationary Operational Environmental Satellite, 2015)

Obviously,  LDCM and GOES do not have proximity links. The LDPC codes have been selected for their 'normal' EESS (Earth Exploration Satellite Service) data downlink to Earth.

The White Paper mentions MSL Electra for LDPCC addition, but it would be very interesting to know which kind of  backward compatibility is included in Electra upgrade with LDPCC.
I am sure that this information will be very valuable for those missions that will stick to the former Proxi-1 coding for missions flying or under (frozen) development.

Best regards

Gian Paolo

"Kazz, Greg J (313B)" <greg.j.kazz at jpl.nasa.gov>
Sent by: sls-slp-bounces at mailman.ccsds.org

17-02-2010 23:41


"Gian.Paolo.Calzolari at esa.int" <Gian.Paolo.Calzolari at esa.int>, "sls-cs at mailman.ccsds.org" <sls-cs at mailman.ccsds.org>, "sls-ngu at mailman.ccsds.org" <sls-ngu at mailman.ccsds.org>, "sls-slp at mailman.ccsds.org" <sls-slp at mailman.ccsds.org>



[Sls-slp] Making LDPC coding a work item in the C&S WG


I would like to request that LDPC coding applied over the Proximity link be made into a Work Item for study in the CCSDS C&S WG and to be included into the agenda for the Spring 2010 meeting.
NASA has submitted it’s white paper on LDPC coding over the Proximity link as proposed at the Fall CCSDS meeting at ESTEC and I believe since a month has passed all agencies now have had time to consider the issues explored in the paper. Given the enhanced focus on cooperation between ESA and NASA in the Mars Enterprise for 2016 and 2018 and beyond and the potential benefits LDPC coding provides to these missions, I believe it is prudent for the C&S WG to take on this topic as a new work item. I also believe other agencies  besides NASA and potentially ESA are interested in having CCSDS pursue this as a work item as well.

Best regards,

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