APPARATUS AND METHOD FOR GENERATING AND DECODING FORWARD ERROR CORRECTION CODES HAVING VARIABLE RATE IN A HIGH-RATE WIRELESS DATA COMMUNICATION SYSTEM

摘要

The invention relates to an apparatus for generating Quasi-Complementary Duo-Binary Turbo Codes (QC-DBTC), comprising a duo-binary turbo encoder (810)having a plurality of constituent encoders for receiving an information symbolstream (800), and generating a plurality of systematic symbol streams and aplurality of parity symbol streams according to a given code rate, wherein theplurality of parity symbol streams are generated from the plurality of constituentencoders associated thereto and the parity symbol streams from one of theplurality of constituent encoders correspond to the parity symbol streams fromanother one of the plurality of constituent encoders; a quad-symbol mapper(630)for quad-mapping the plurality of systematic symbol streams to one symbolstream; a channel interleaver (816 a) for interleaving the quad-mappedsystematic symbol stream and the plurality of parity symbol streams from theplurality of constituent encoders, quaddemapping the quad-mapped systematicsymbol stream, interlacing symbol streams in the plurality of parity symbolstreams corresponding to each other from among the interleaved parity symbolstreams, and serial-concatenating the quaddemapped systematic symbol streamand the interlaced parity symbol streams; and a duo-binary turbo code generator(822) for repeating the serial-concatenated symbol stream, and selecting apredetermined number of symbol streams from the repeated symbol streamsaccording to the given code rate and selection information thereby generatingQC-DBTC codes.