Читать книгу Digital Communications 1 - Safwan El Assad - Страница 17

It is a source for which the probability of occurrence of a symbol depends on the symbols already emitted (statistical dependence) and on instants 1, 2, ..., n where they have been emitted:

[2.3]

If the source is in addition stationary then the dependence is only on the ranks and not on the moments when the symbols have been transmitted, so:

[2.4]

that is, the statistical properties are independent of any temporal translation. We can consider that a text written in any language is an example of such a source.