Error rate

Recall that Information may be defined in four ways

Fig 1 2-LAR system of representation of Information

Modality (in root) deals with information at the sink being

The most widely used measure for characterizing modal nature of information transmission is Error Rate.

Error rate is the probability Pe that a symbol at the sink is not the symbol W emitted at the information source.

Pe is also called 'symbol' Error Rate and Pb is called 'bit' Error Rate. Typically

P sub b is lessthan P sub e times H(X)
Determining the Error Rate is difficult but the 'lower bound' of Pe can be determined using Fano's inequality.


Summary (p:4) ➽