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Communication Mediums for Signal, ITS, and Freeway Surveillance Systems Final Report (1996) / Chapter Skim
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A.2.2 Theoretical and In Practice Capacity of Digital Communication Mediums
Pages 348-352

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From page 348...
... Similarly, Me evolving commercial digital television win provide exceptional quality TV to most of Me public; however, viewers on the fringe of the signal coverage area may no longer get a chewable picture (without cable or over source) because the weaker RF signal win create a badly detenoratM (unusable)
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From page 349...
... = 25.0 kbps In practice, bit rates of 4.8 to 19.2 kbps are being obtained over 25 kHz radio channels. RF bit rates in practice are usually substantially less Han Be theoretical limits due primarily to extensive portable transceivers dial cannot employ specially efficient modulation techniques due to battery drain requirements, small equipment size and weight requirements, and cost constraints.
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From page 350...
... In realibr, the available bandwidth and bit rate of fiber is adequate without near tenn concern for efficiency. The modem industry appears to have most closely approached He attainable limits predicted by Shannon's theory, thus it is instructive to review modem performances achieved in practice and to note that the recent ITU V.34, 28.8 kbps starboard, over a 3500 Hz public circuit, is operating close to the limit.
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From page 351...
... ~ z Be o ~ ~ ~n ~~s c, ~ - O ~ ~ l== .~ ,,o, ~z oo ' z oz o
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From page 352...
... ~ :E o ~ ~ o o o · 3 ._ _ a, Cot Cot o ~2 ~ s I ~ 10O 1smm1,:.
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Key Terms

  • bit rates
  • digital communication
  • communication channel
  • efficient modulation
  • theoretical limits

  • modulation techniques
  • modem industry
  • closely approach
  • equipment size
  • battery drain

  • extensive portable
  • digital bit
  • maximum bit
  • operation closer
  • below ashore

  • limits due
  • available communication
  • specially efficient
  • snowy picture
  • specmally efficient

  • bandwidth required
  • exceptional quality
  • video images
  • techniques due
  • kbps typical

  • cuntent analog
  • mat shannon
  • near tenn
  • limidng performance
  • digital television


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