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CCA Preamble Detect – Fact vs. Fiction – Full email thread initiated by C. Lukaszewski – 9/27/2015

Home › Forums › WiFi Deep Dive › CCA Preamble Detect – Fact vs. Fiction – Full email thread initiated by C. Lukaszewski – 9/27/2015

  • This topic has 32 replies, 1 voice, and was last updated 6 years, 10 months ago by Rick Murphy.
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  • April 4, 2016 at 5:01 pm #3007
    Rick Murphy
    Forum Admin

    On Dec 1, 2015, at 6:31 AM, Rick Murphy wrote:

    Chuck,

    Thanks for digging this up. If it’s in Eldad’s book then I know its solid. I know this should be obvious, but I’ve always had difficulty reading these waterfall charts. Can you help with the following?

    If
    10^-2 = .01 = 1%
    then it follows that:
    10^-1 = .1 = 10%
    and
    10^0 = 1.0 = 100%.

    Why does the * on the 4 dB scale = 15%?

    Thanks,
    Rick

    April 4, 2016 at 5:02 pm #3008
    Rick Murphy
    Forum Admin

    On Dec 1, 2015, at 9:46 AM, Chuck Lukaszewski wrote:
    Note the log scale on the Y axis.

    The * at 4dB corresponds to 10^-0.8.

    10^-0.8 = .1585 = 15.8%

    The x^y button on windows calculator will produce this for you. Be sure to change the sign on the .8 before hitting equals.

    -cl

    April 4, 2016 at 5:03 pm #3009
    Rick Murphy
    Forum Admin

    On Dec 1, 2015, at 12:26:10 PM, Rick Murphy wrote:

    Got it!

    On the Windows7 calculator in Scientific view:
    press: 10
    press: x^y
    enter: .8
    press: -^+ (plus over minus key to change sign)
    press: =
    result: 0.158489319244611134852021013733915 (Because, I thrive on precision :-))

    Thanks so much.
    Rick

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