How do I convert 480i to 1080i from satellite to HDTV

Hello,I have a Vizio 50inch HDTV,Plasma,and I am only recieving 480i throgh Dish satellite. Is there any type of converter box i can hook up and change the 480i to 1080i input signal to the TV set. The picture isn't terible but you can tell it a to it's fullest picture.

I have a DVD player tha converts the CD to a 1080i picture,and this is a awesome difference,the picture is fantastic. Any ideas or help would be appreciated to the fullest. Thank you ,,Mark


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