Turbo-codes have attracted a great deal of interest since their discovery in 1993 by a team of French scientists who developed the so called turbo codes .Turbo code is not just a new set of codes, but a new way of thinking about channel coding, hence a new paradigm -Turbo-codes have attracted a great deal of interest since their discovery in 1993 by a team of French scientists who developed the so called　 turbo codes　 .Turbo code　is not just a new set of codes, but a new way of thinking about channel coding, hence a new paradigm