Re: [Discuss-gnuradio] OOK modulation naming

[Michael Ossmann]

Great find, Jeff!  I'm also finding it called "Digital Pulse Interval
and Width Modulation" with the same acronym.  I think it is clearer with
the "and" in there, and that version of the name dates back at least to
1995.

Mike


On Thu, Apr 02, 2015 at 04:24:06PM -0400, Jeff Long wrote:
>
> After way to much searching ... under Anisochronous modulation, there is 
> something called Digital Pulse Interval Width Modulation (DPIWM).
> 
> http://paradise.caltech.edu/papers/thesis010.pdf
> 
> Seems like as good a name as any.
> 
> - Jeff
> 
> On 04/02/2015 03:28 PM, Michael Ossmann wrote:
> > I though NRZI had a constant symbol rate.  I would expect 011101001 in
> > NRZI to look like:
> >
> > _-_--___-
> >
> > Mike
> >
> >
> > On Thu, Apr 02, 2015 at 03:23:57PM -0400, Jeff Long wrote:
> >>
> >> Hey Mike,
> >>
> >> I think that NRZI.
> >>
> >> - Jeff
> >>
> >> On 04/02/2015 02:36 PM, John Ackermann N8UR wrote:
> >>> Why not make the ratio 1:3 and then you could call it Morse PWM. :-)
> >>>
> >>> On 4/2/2015 2:16 PM, Michael Ossmann wrote:
> >>>> A friend recently showed me an OOK modulation that I had never seen
> >>>> before, and I'm wondering if anyone knows a name for this scheme.
> >>>>
> >>>> It is PWM where both the on periods and off periods carry data in their
> >>>> durations.
> >>>>
> >>>> In the example we observed, an on or off period with a duration of two
> >>>> units represents a zero.  An on or off period with a duration of one
> >>>> unit represents a one.  Example:
> >>>>
> >>>> --_-_--_--__-
> >>>>
> >>>> This sequence of amplitudes represents the binary data 011101001.
> >>>>
> >>>> Note that this scheme has a variable data rate.  (Two packets carrying
> >>>> the same number of bits may have different durations.)  Overall,
> >>>> however, the data rate is higher than in a similar looking scheme in
> >>>> which data are encoded only in the on periods.
> >>>>
> >>>> Does anyone know what to call this?  I am tempted to call it Biphase
> >>>> PWM.
> >>>>
> >>>> Thanks,
> >>>>
> >>>> Mike
> >>>>
> >>>> _______________________________________________
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> >>>>
> >>>
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