[CST-2] Info Theory

[Alvin]

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