The ROC of sequence [] = (0.8) ∪[] + (0.4) ∪[]

1.	The ROC of sequence [] = (0.8) ∪[] + (0.4) ∪[]
Answer» ROC &Rightarrow; 1 - 0.8 z-1 < 0 1 - 0.4 z-1 &Rightarrow; 1 > 0.8 z-1 &Rightarrow; z > 0.4 or z > 0.8 By combining both condition ROC because z > 0.4 If you consider z > 0.8 then ROC between the limit 0 to 0.4 excluded.

Discussion