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A Concept Paper on ‘ VLSI Implementation of Turbo Decoders

Turbo codes are the best coding scheme for error correction in high-speed wireless systems because they achieve the highest coding gain. However, the implementation of various Turbo Decoders suffers from a large delay and high power consumption. For this reason, they are not suitable for many applications like mobile communication systems. In this paper, a comparative study has been made and various decoding algorithm used in SISO Turbo Decoders have been analyzed viz. MAP, Log-MAP, MaxLog-MAP and SOVA, to overcome this drawback. It presents the discussion of complexity and performance trade-offs of SISO Turbo decoders.