In the book : Coding theory-Algorithms, Architectures and Applications p.20, the authors have introduced the following inequality ( and precised that it was taken from Bossert's Channel Coding for telecommunications ):

$$\frac {P_{err}}{k} \leq P_{Sym} \leq P_{err}$$

Where $P_{err}$ is the word error probability and $P_{Sym}$ is the average symbol error probability.

While the rightmost inequality is intuitive, I cannot fathom the left side.


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