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Big Picture Status

SCAWG Coding, Modulation, and Link Protocol Study Status Report to SCAWG January 24, 2007 Les Deutsch & Frank Stocklin. Big Picture Status. Team charter and deliverables approved by SCAWG at face-to-face meeting on December 13, 2006 Team assembled – “best in NASA”

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Big Picture Status

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  1. SCAWG Coding, Modulation, and Link Protocol StudyStatus Report to SCAWGJanuary 24, 2007Les Deutsch & Frank Stocklin

  2. Big Picture Status • Team charter and deliverables approved by SCAWG at face-to-face meeting on December 13, 2006 • Team assembled – “best in NASA” • Held kick-off telecon with team on December 21, 2006 • Scheduled weekly telecons with entire team • Developed overall plan for the study • Set up web area for team in SCAWG site • Formed four subteams for early phase of work • Begun work in all subteams • Invited outside consultants to check for completeness

  3. Team • Les Deutsch and Frank Stocklin, co-leads • Monty Andro (GRC) • Dan Brandel (HQ) • Loren Clare (JPL) • Dariush Divsalar (JPL) • Sam Dolinar (JPL) • Pat Eblen (NASA HQ) • Wai Fong (GSFC) • Jay Gao (JPL) • Jon Hamkins (JPL) • Dave Israel (GSFC) • Dennis Lee (JPL) • Peter Militch • Bob Nelson • Gary Noreen (Cx) • Richard Orr (Sa-Tel) • Fabrizio Pollara (JPL) • Tudor Stoenescu (JPL) • Scott Sands (GRC) • Victor Sank (GSFC) • Len Schuchman (Sa-Tel) • John Wesdock (GSFC) • Dave Zillig (GSFC) Subteam Leads: Systems Engineering: Gary Noreen Coding and Modulation: Jon Hamkins Multiple Access: Dave Zillig Link Protocols: Loren Clare

  4. From the Kick-off • The following charts are extracted from the CMLP Study kick-off telecon held on December 21

  5. A Hole in the Layers (from kick-off) • SCAWG has defined a set of links across the Solar System • SCAWG has recommended spectrum for these links • SCAWG has recommended some networking protocols • SCAWG has NOT recommended how to implement the physical link up to the link layer protocols • This is problematic for several reasons • In the absence of overall guidance, missions may chose multiple directions, thereby costing more to develop and operate • There is no direction to the international standards community • There is no direction to SOMD to implement these links in the NASA comm/nav infrastructure • There is no guidance to NASA technology investors to develop needed spacecraft comm/nav systems

  6. Purpose of the Study (from kick-off) • Plug this hole • Recommend and justify link designs for the SCAWG architecture • Defendable to naysayers • Provide guidance • To the builders of NASA’s comm/nav infrastructure • To spacecraft technology developers • To NASA mission concept developers • To the NASA Standards Program • Identify key SOMD comm/nav investments • Engage potential international partners • To capture good ideas • To build advocacy for international standards • To build good will

  7. Scope (from kick-off) • Every link in the SCAWG architecture • All reasonable coding, modulation, and multiple access schemes • We will apply common sense to narrow the study space • SCAWG will act as the approving authority for the elimination of schemes from specific link analyses • We will consider only certain properties of link protocols • We will not select specific protocols • We WILL consider things the effect coding and modulation selection • Retransmission, Adaptive rate control … • Unresolved: To what extent will we consider radiometrics and navigation?

  8. Deliverables (from kick-off) • Monthly progress reports to John Rush • SOMD will relay these to the international community to keep them engaged • By June, we will deliver a draft final report that will include • A catalog of NASA’s existing links with descriptions • A catalog of the SCAWG links with (for each link) • A list of all the coding, modulation, protocol, and access schemes studied including evaluation according to a set of “figures of merit”(FOMs) • A small number of recommended coding, modulation, link protocol attributes, and multiple access schemes • In June, the report will be presented at an IOAG meeting in Madrid • We will gather feedback from our international partners • Final report to be released in Summer, 2007

  9. What is Already Accomplished? (from kick-off) • We are allowed to use any NASA study we wish • As long as we (as a team) agree that the results are technically valid • We can also glean results outside of NASA as needed • As long as we (as a team) agree that the results are technically valid • Luckily, lots has been done • We will strive to do as little new work as possible

  10. Plan (from kick-off) • Near term tasks • Create catalog of existing NASA links • Create catalog of SCAWG links • Glean requirements (SCAWG Key Reqs, DSMS L1s and Cx are good starting points) • Create list of FOMs for evaluation • Create list of coding, modulation, protocol, and access schemes for analysis • Find all relevant, technically sound existing studies • Mid term tasks • Define (and get SCAWG agreement) a list of schemes to evaluate for each link • Do the analysis and evaluate the FOMs • Get agreement (with SCAWG) of FOM weighting for each link • Ending tasks • Create recommendations for each link • Write draft final report

  11. CMLP Study Master Schedule Dec Jan Feb Mar Apr May Jun Jul Aug Generate link template Identify & group missions Assemble NASA link catalog Identify driving links Coding and modulation catalog Multiple access catalog Link protocol attribute catalog Evaluate performance of alternatives Generate alternative solutions Compare based on cost & FOMs Identify “best” solutions Cross check against NASA link catalog Draft interim report IOAG meeting Interaction with Intl’ Partners Finish final report

  12. Link Catalog • Begun work on NASA link catalog • Modeled on Cx catalog

  13. Catalog of Codes • 162 Codes so far • 43 attributes per code • Entire team is reviewing attributes list to be sure it will cover all reasonable FOMs

  14. Catalog of Modulation Schemes • ~50 modulation types so far • 25 attributes per type • Entire team is reviewing attributes list to be sure it will cover all reasonable FOMs

  15. Other • Multiple Access Catalog • Team has begun work • Concentrating on CDMA and TDMA schemes first • Link Protocol Attributes • New team lead in place (Loren Clare) • Team begun work last week • No products yet • Integration of radiometrics • Met with Bob Nelson and agreed to include radiometric attributes in link evaluations • Outside Consultants • Invited six outside (non-NASA, but US) experts to review near-term results • As of Tuesday, three have accpeted • Dr. Tad White, NSA • Rob Nichols, APL (referred by Bob Bokulic, who will also examine results) • Dr. Bob Fruelholz, Aerospace Corporation (will also get others there involved) • Still waiting for responses from Caltech, Ball, and Boeing (retired)

  16. Summary • CMLP Study is defined and underway • Good progress is being made • Some items still require resolution • SCAWG review of catalogs needed before intense analysis begins

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