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[aprssig] an off-topic query about statistical analysis in digital modes

w0ep at frii.com w0ep at frii.com
Thu Sep 20 20:09:16 UTC 2007



Is there a good book to learn about these things?


On Thu, 20 Sep 2007, Scott Miller wrote:

> I think what you're describing is basically a convolutional code.
>
> Such things work better when you've got side-channel information to work
> from - like if you know one particular bit was closer to the decision
> threshold than the others, you know that one's the most likely to be wrong.
>
> In APRS you might be able to recover more data by knowing that certain
> fields are always digits, or always alphanumeric, and using that
> knowledge to try flipping specific bits to see if the new message
> matches the checksum.
>
> Of course, you're still better off encoding it with a proper
> convolutional code in the first place...
>
> Scott
> N1VG
>
> w0ep at frii.com wrote:
> > We've kind of been on an off-topic swing and
> > I know this is a good place to find people that know
> > about digital data transmission so:
> >
> > Are there any digital data transmission systems that
> > use a dictionary of expected terms and statistical
> > analysis that assigns probability to incoming
> > raw data to match against the dictionary?
> >
> > Sort of like what my BlackBerry does with SureType mode?
> >
> >
> >
> > _______________________________________________
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> > aprssig at lists.tapr.org
> > https://lists.tapr.org/cgi-bin/mailman/listinfo/aprssig
> >
> >
>
>
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