1. Montreal – Spring 2004 SPACE LINK SERVICES CODING AND SYNCHRONIZATION WORKING GROUP 1 SLS-C&S WG Spring 2004 Meeting Summary to SLS Area Director

2. Montreal – Spring 2004 SPACE LINK SERVICES CODING AND SYNCHRONIZATION WORKING GROUP 2 SLS-C&S WG summary Problems report: –Missing consensus. Future work/charter: –Future work will continue as BOF. Charter to be produced. See further for details.

3. Montreal – Spring 2004 SPACE LINK SERVICES CODING AND SYNCHRONIZATION WORKING GROUP 3 Discussed Topics (1/3) Serial Concatenated Convolutional Codes for 8PSK (ESA/ESTEC/Polito) –Proposal currently ongoing in RFM; informative for C&S. Possible future options together with new modulation schemes. Complexity Comparison of Coding Schemes (ESA/ESTEC/Polito)

4. Montreal – Spring 2004 SPACE LINK SERVICES CODING AND SYNCHRONIZATION WORKING GROUP 4 Discussed Topics (2/3) Requirements, Benchmarking & Overview of Proposed LDPCC (ESA/ESOC/UniBO) –Initial proposal to be discussed and refined with WG Members. Generalized IRA LDPCC (ESA/ESOC/UniBO) –Further possibility for refining LDPCC selection.

5. Montreal – Spring 2004 SPACE LINK SERVICES CODING AND SYNCHRONIZATION WORKING GROUP 5 Discussed Topics (3/3) Orange Book Progress & Considerations on Requirements (NASA/GSFC) JPL Proposal for LDPCC (NASA/JPL) CNES proposal supporting DVB-S2 adoption (CNES)

6. Montreal – Spring 2004 SPACE LINK SERVICES CODING AND SYNCHRONIZATION WORKING GROUP 6 Problem & Way Out (Hopefully) Three Different proposals tabled –NASA/GSFC Quasi-Cyclic LDPCC –NASA/JPL Protograph LDPCC –CNES support to DVB-S2  NO CONSENSUS WG not justified any more Migration to BOF or complete stop?

7. Montreal – Spring 2004 SPACE LINK SERVICES CODING AND SYNCHRONIZATION WORKING GROUP 7 Migration to BOF or complete stop? Member Agencies recognize the difficult status without consensus and take proactive approach. Principle agreement for a set of “agreeable” codes reached. Codes shall be evaluated by BOF work and eventually generate consensus proposal for WG. Resolution: Convert WG to BOF.

8. Montreal – Spring 2004 SPACE LINK SERVICES CODING AND SYNCHRONIZATION WORKING GROUP 8 Agreed Set Rate ½ Code to be derived by JPL proposal Rate 7/8 Code to be derived by GSFC proposal C2 Rates 2/3, ¾ and 5/6 Quasi-Cyclic Codes to be proposed by GSFC All codes to be validated by BOF taking as reference DVB-S2 characteristics.

9. Montreal – Spring 2004 SPACE LINK SERVICES CODING AND SYNCHRONIZATION WORKING GROUP 9 Objectives of BOF 1.Identify a set of mandatory/desirable requirements (addressing also interaction with modulation). 2.Define a Benchmark Matrix for evaluation of proposed codes wrt identified req’s. 3.Identify a set of Quasi-Cyclic LDPCC for frames of (approx) 8 & 16k bits (des.32k). 4.Select the proposed codes by proper benchmarking.

10. Montreal – Spring 2004 SPACE LINK SERVICES CODING AND SYNCHRONIZATION WORKING GROUP 10 Schedule of BOF 1.Identify requirements. 2.Define a Benchmark Matrix. By Fall 2004 3.Identify a set of Quasi-Cyclic LDPCC for frames of (approx) 8 & 16k bits (des.32k). 4.Select the proposed codes by proper benchmarking. By Spring 2005 (Initial results) By Fall 2005 (Finalized results)

11. Montreal – Spring 2004 SPACE LINK SERVICES CODING AND SYNCHRONIZATION WORKING GROUP 11 One task for the WG? The Orange Book Task is not dropped. Shall it continue as (only) task of the WG while the code selection is moved to the newly created BOF?