2000 · 303 citations · 19 references
EngineeringComputer ScienceElectrical EngineeringDigital CommunicationInformation TheoryWireless CommunicationsChannel CapacityChannel CodingCoding TheoryError Control CodingError DetectionError-correcting CodesBinary CodesCoding SchemesConcatenated CodesConvergenceDecoding AlgorithmsDecoding SchemesIterative DecodingTurbo Codes
Since the discovery of turbo codes, iterative decoding has become a vital research area in digital communications, with applications to many detection and decoding problems, and recent interest has focused on convergence properties rather than only maximum likelihood performance. The study uses the EXIT chart to investigate the convergence properties of bit‑interleaved coded modulation, equalization, and serially concatenated binary codes. The authors analyze these properties using EXIT chart techniques. The EXIT chart leads to new design ideas such as inner and outer doping, enabling code concatenations with iterative decoders operating close to the capacity limit.
Since the discovery of parallel concatenated (turbo) codes, iterative decoding has become a vital field of research in digital communications. Applications of the turbo princi- ple to many detection and decoding problems have been found. While most studies have focused on designing code concate- nations with respect to maximum likelihood decoding perfor- mance, the convergence properties of iterative decoding schemes have gained a considerable amount of interest just recently. In this paper we use the extrinsic information transfer chart (EXIT chart) to illuminate the convergence properties of bit- interleaved coded modulation, equalization, and serially con- catenated binary codes. The EXIT chart leads to new design ideas like inner and outer doping, facilitating the construction of code concatenations with iterative decoders operating close to the capacity limit.
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