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Technical Analysis Of VMSK

Posted by michael on from the tilting-at-windmills dept.

Phil Karn writes: "Regarding the Slashdot article on VMSK that appeared August 22, 2000, I have written a detailed technical analysis that shows it to be snake oil." I'm convinced.

1 of 68 comments (clear)

  1. Re:More understanding is needed by Matt_Bennett · · Score: 5

    The Shannon-Hartley equation (usually referred to as Shannon's limit) is this:

    capacity=bandwidth*log(base2)*(1+Signal/Noise)

    The 33Kbit/second limit for a traditional analog/analog phone line comes from this- Signal/Noise is about 256:1 (8 bit sampling), 4KHz bandwidth-- capacity of a 4KHz phone line is about 32000 bits/second.

    108MHz leading to 108MBit/sec would only be from simple on off keying- which makes no use of the signal/noise ratio. If you had about 48dB of S/N on 108MHz that leads to a capacity of 860 Mbit/second.