ABSTRACT
Surprises and redundancy In the last chapter we saw how the amount of information in a received signal pattern depends upon how confident we can be that its details are correct. We also saw how the probability that a digital bit of information will be correctly received is
c = ![1 + Erf{~}] 2 V2.a ... (5.1) where V, is the peak-to-peak size of the signal voltage and a is a measure of the width of the noise voltage's probability density pattern (histogram). This expression is theoretically fine, but it can be awkward to use in practice. In most real situations it is more convenient to deal with signal and noise powers or rms voltages. We therefore need to turn expression 5.1 into a more useful form.
