[CST-2] Info Theory

[Chris Applegate]

Yeah, that was my working too.

A quick example of W=1, SNR = 99 (which can be thought of as a 0.01
error rate, can't it?) gives 2.90 as the difference. The model answer
does say 'about' when it says bandwidth, so presumably he has done some
sort of approximation somewhere.

Cheerio,

Chris
do something lastminute.work

Chris Applegate
Room X6, Corpus Christi College, Cambridge, CB2 1RH
chris@qwghlm.co.uk / www.qwghlm.co.uk / [Redacted by SRCF sysadmins on request]
ICQ 41706821          PGP key available on request




> -----Original Message-----
> From: cst-2-admin@srcf.ucam.org [mailto:cst-2-admin@srcf.ucam.org]On
> Behalf Of Alvin
> Sent: 2 June 2002 23:14
> To: cst-2@srcf.ucam.org
> Subject: Re: [CST-2] Info Theory
>
>
> I think Daugman's working goes along the lines of:
>
> C = Wlog(1 + P/NW)
>
> C' = Wlog(1 + P/8NW)
>
>    ~= W(log(1 + P/NW) + log(1/8)
>
>     = W(log(1 + P/NW) - 3)
>
>     = C - 3W
>
> Which is a close approximation if P/NW was a lot larger than
> 1...  What is
> the norm for SNR anyway?
>
> Alvin
>
> > Just running through the info theory examples sheet again.
> >
> > Set 8, part d. I reckon C' = C/8 (approx) by the taylor
> expansion of lg,
> > (some brief experiments with gnuplot confirm this). Have I
> misunderstood
> > the question -- I read it as C' = W lg (1 + P/(8NW))
> >
> > ?
> >
> > Thanks
>
>
>
> _______________________________________________
> CST-2 mailing list
> CST-2@srcf.ucam.org
> http://www.srcf.ucam.org/mailman/listinfo/cst-2