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Communication Mediums for Signal, ITS, and Freeway Surveillance Systems Final Report (1996) / Chapter Skim
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A.2.3 Repeaterless Link Distances: Link Budgets
Pages 353-357

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From page 353...
... As each communication medium, or channel, has unique impairment charactenstics and combinations, the details of He specific solution are medium dependent and accommodated by equipment manufacturer designs and specifications. For ITS system-level design, He important parameters are supportable bit rate, bandwidth, and resulting bit error rate (}3ER)
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From page 354...
... A link budget establishes that Be transmitter power, transmission attenuation, and received signal power meet the foDour~ng: PT PL = PR >= PSEN where: PT PA PR PSEN (Equation A.2.41) is the transmit power is the transmission loss or attenuation is the receive power is He minimum received Power for the specified Bit Error Rate (BER)
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From page 355...
... It is, however, a required design consideration and is usually adequate for link distance planning (and cost estimating) with fine tuning for other factors In the detailed communication system design.
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From page 356...
... 6.0 DB 13.6 DB Table A.2.3-2 presents representative link budgets and parameters for popular llS communication mediums and includes typical I) t~sm~tter launch powers, 2)
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From page 357...
... 1.75 dB/km, (2.8 dB/mi) Typical Receiver Sensitivity, dBm 1200 bps or less - 0,-35 to -50 dBm 2400 or greater dBm _ ~ Representative Repeaterless Link Distance (km)
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Key Terms

  • link distance
  • bit error
  • repeateriess link
  • link budgets
  • loss components

  • error rate
  • communication mediums
  • loss calculations
  • minimum receiver
  • communication medium

  • receive power
  • representative link
  • transmission loss
  • budget concept
  • supportable link

  • signal power
  • received signal
  • receiver sensitivity
  • receiver power
  • link loss

  • resulting bit
  • receiver bit
  • lls communication
  • typical loss
  • following table

  • margin buffers
  • reliable communications
  • dominant factor
  • application requirements
  • reasonable worst


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