Project Title

Improved Coding Schemes for the Proximity Link



Document Number



5.02 Space Link Coding and Synchronization Working Group

Document Type


Description of Document

CCSDS 211.2-B: Proximity-1 Space Link Protocol—Coding and Synchronization Sublayer. Blue Book. This Recommendation specifies Proximity space links. This Recommendation contains the Coding and Synchronization Sublayer specification originally published as part of CCSDS 211.0-B-1, Proximity-1 Space Link Protocol. Objective of this Project is to propose the addition of Improved Coding Schemes as the LDPC code AR4JA (1024,1/2) to the Proximity‐1 Coding and Synchronization Sublayer. The rationale for the addition is to employ a code which provides a significant improvement (2‐3 dB) more than the current Proximity‐1 coding scheme (Convolutional only). The ultimate goal is to enhance the data return on the Proximity‐1 link by at least 30% to 40% over the current baseline without major impact to the existing Prox‐1 protocol and installed base. Backward compatibility will also be ensured.

Applicable Patents

There are patent issues in this work area, but appropriate ISO forms have been submitted indicating RAND licensing policy by the patent holder or licensor (explain in comments).

Patent Comments

United States Patents 7343539 (ARA type protograph codes) and 7499490 (Encoders for block-circulant LDPC codes) are applicable. These patents are also applicable to CCSDS 131.0 and the signed ISO patent declaration form for US Patents 7343539 and 7499490 has been already provide for ""CCSDS 131.0 TM channel coding blue book; i.e. the identified patent issues are covered by signed ISO patent declaration forms indicating RAND license terms.

Survey of Similar Standards
Documents or Projects
Undertaken in Other Bodies
and elsewhere in CCSDS


Book Editor


Book Editor Resources

WG Chair

Prototype 1


Prototype 1 Resources


Prototype 2


Prototype 2 Resources


Prototype 3

Prototype 3 Resources


Monitor Only


Resource Comments


Legend for Schedule Milestones
Orange Bullet = Required for Orange Books
Green Bullet = Required for Green Books
Magenta Bullet = Required for Magenta Books
Blue Bullet = Required for Blue Books
Note - Red Books are Draft Blue/Magenta Books

Schedule Milestones
Orange BookGreen BookMagenta BookBlue Book
Original Completion Date
(Date in M/D/YYYY format.)
(Date in M/D/YYYY format.)
Project ApprovedOrange BulletGreen BulletMagenta BulletBlue Bullet4/4/2011
Project Start DateOrange BulletGreen BulletMagenta BulletBlue Bullet7/30/2011
Internal WG Review
First Draft Circulated to WGOrange BulletGreen BulletMagenta BulletBlue Bullet4/4/2011Preliminary discussion held at Spring 2011 Berlin
First Draft Comments DueOrange BulletGreen BulletMagenta BulletBlue Bullet5/15/2011
Second draft circulated to WGOrange BulletGreen BulletMagenta BulletBlue Bullet6/15/2011
Second Draft Comments DueOrange BulletGreen BulletMagenta BulletBlue Bullet9/30/2011for discussion at Fall 2011 Meeting
Final WB Submitted to AD for Further ProcessingOrange BulletGreen BulletMagenta BulletBlue Bullet11/15/2011Pink Sheets, not White Book
External Milestones
Secretariat Document ProcessingOrange BulletGreen BulletMagenta BulletBlue Bullet11/30/2011Agency review started on 19 March 2012, ending 1 June 2012
First Agency ReviewMagenta BulletBlue Bullet2/28/2012RIDs collected
RID ResolutionMagenta BulletBlue Bullet4/20/2012Delayed by discussion on (P)ICS
Secretariat Document Processing 2Magenta BulletBlue Bullet5/1/2012CESG-P-2013-11-008
Final Agency ReviewMagenta BulletBlue BulletNOT needed
RID ResolutionMagenta BulletBlue BulletNOT needed
First Prototype DevelopmentBlue Bullet3/1/2012See NASA.LDPCyellowV3.pdf for 131.0-B-2
Second Prototype DevelopmentBlue Bullet3/1/2012See NASA.LDPCyellowV3.pdf for 131.0-B-2
CMC ApprovalOrange BulletGreen BulletMagenta BulletBlue Bullet5/15/2012CMC-P-2013-12-007
Total Time to Complete
(in months)
Version: 169.0
Created at 3/18/2011 10:09 AM by Calzolari Gian Paolo
Last modified at 5/28/2014 4:45 AM by Calzolari Gian Paolo