SLS-C

1
SLS-CS WG

• Spring 2004 Meeting
• Summary to SLS Area Director

2
SLS-CS WG summary

• Problems report
• Missing consensus.
• Future work/charter
• Future work will continue as BOF. Charter to be
  produced.
• See further for details.

3
Discussed Topics (1/3)

• Serial Concatenated Convolutional Codes for 8PSK
  (ESA/ESTEC/Polito)
• Proposal currently ongoing in RFM informative
  for CS. Possible future options together with
  new modulation schemes.
• Complexity Comparison of Coding Schemes
  (ESA/ESTEC/Polito)

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
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
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
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
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
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 reqs.
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
Schedule of BOF

• Identify requirements.
• Define a Benchmark Matrix.
• By Fall 2004
• Identify a set of Quasi-Cyclic LDPCC for frames
  of (approx) 8 16k bits (des.32k).
• Select the proposed codes by proper benchmarking.
• By Spring 2005 (Initial results)
• By Fall 2005 (Finalized results)

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?