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  3. Lab 6: implementing a preamble
  4. 6.3. timing issues: length of

6.2 6.3. timing issues: length of the preamble

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  • Use the oscilloscope to visualize the energy consumed by a board, you can clearly see the periodic wakeup of the CC2500 (see figure below, lower part).
    current_ps
    Energy consumed by the transmitter and the receiver in preamble sampling. To function, the length of the preamble needs to be larger than the check interval CI.
  • You can see that the time between two successive wake-ups is CI=104ms . Push the button and capture the energy consumed when the board is in transmit mode (see figure, upper part). You can see the series on 50 microframes sent.
  • By zooming in, you can see that one micro-frame is sent every Dcca=3.24ms . Hence, the length of the whole preamble is 50*3.24=162ms , which is larger that the check interval.
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Source:  OpenStax, Ezwsn: experimenting with wireless sensor networks using the ez430-rf2500. OpenStax CNX. Apr 26, 2009 Download for free at http://cnx.org/content/col10684/1.10
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