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Link Budgets. DCS MANUFACTURERS MEETING NOVEMBER 9, 2006 Peter Woolner Mitretek Systems pwoolner@mitretek.org 703-610-1724. What Is a Link Budget. It is a theoretical calculation of end-to-end performance for a communications path under a specific set of conditions.

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link budgets

Link Budgets

DCS MANUFACTURERS MEETING NOVEMBER 9, 2006

Peter Woolner

Mitretek Systems

pwoolner@mitretek.org

703-610-1724

what is a link budget
What Is a Link Budget
  • It is a theoretical calculation of end-to-end performance for a communications path under a specific set of conditions.
  • Sometimes the conditions are stated; most often at least some of them are implied or assumed.
  • Every link budget implies everything not included is irrelevant.
    • Sometimes this is true
why is a link budget important
Why is a Link Budget Important
  • A link budget is used to predict performance before the link is established.
    • Show in advance if it will be acceptable
    • Show if one option is better than another
    • Provide a criterion to evaluate actual performance
link budget components
Link Budget Components
  • A satellite link budget should include the following parts:
    • UPLINK
    • DOWNLINK
    • COMBINE 1 AND 2
    • DEFINE PERFORMANCE LIMIT(S)
    • COMPARE CALCULATED AND DESIRED PERFORMANCE
link budget evaluation
LINK BUDGET EVALUATION
  • The basic question is: Is the operating margin large enough?
    • It must be positive to account for the items listed in the budget
    • It also must cover the variations caused by everything that was not explicitly included
  • Therefore a more useful question is: What was not included in the budget that might be a significant factor?
evaluation continued
EVALUATION (continued)
  • Some factors I consider important are:
    • Satellite non-linearity (NPR)
    • Satellite transmit power for your signal
    • Interference (including CDMA if implemented)
    • Allowance for future (worse) conditions
    • Lifetime of the system under evaluation
    • How closely can it be maintained at the parameters used in the budget