TURBO CODES UNDER UNEQUAL ERROR PROTECTION

With the two component encoders of turbo codes and the required size of interleavers given,the turbo codes are put under unequal error protection.A whole family of turbo codes at different unequal error protection levels can be obtained by controlling the amount of redundancy assigned to each importance class and the class positioning in the input frame.The turbo codes under unequal error protection can be decoded by the same turbo interative decoder if programmable puncturing and interleaving is used for decoding.