文档介绍：ABSTRACTSynchronizationerrors,informsofinsertionsanddeletionsinbitorsymbollevelinthereceivedsequences,municationandrecordingsystems,suchasdifferentialpulse-positionmodulation(DPPM)icrecording(BPMR),,error-correctingcodesdesignedforsubstitution-,whichcancorrectinsertion,deletion,,thisschemeiseffectiveonlywhentheconvolutionalblockboundariesareknowntothereceiver,,,twodecodingalgorithms,bidirectionalViterbialgorithm(BVA)andmodifiedLog-MAPalgorithm,,,,,toimprovetheperformanceoftheconvolutionalcodingscheme,aniterativedecodingschemeforReed-Solomon(RS),whichistheconvolutionaldecoder,cangetsynchronizationinformationofthereceivedsequencesandcorrecterrors,whereastheouterdecoder,,,,thisproposedschemecanhav