Re: [Discuss-gnuradio] OOK modulation naming

[Michael Ossmann]

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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