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Channel Codes by Shu Lin, William Ryan

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7Turbo Codes

Turbo codes, which were first presented to the coding community in 1993 [1, 2], represent one of the most important breakthroughs in coding since Ungerboeck introduced trellis codes in 1982 [3]. In fact, the invention of turbo codes and their iterative “turbo” decoders started a revolution in iteratively decodable codes and iterative receiver processing (such as “turbo equalization”). Most frequently, a turbo code refers to a concatenation of two (or more) convolutional encoders separated by interleavers. The turbo decoder consists of two (or more) soft-in/soft-out convolutional decoders which iteratively feed probabilistic information back and forth to each other in a manner that is reminiscent of a turbo engine. In this chapter ...

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