关键词: 准循环LDPC编码, 循环移位寄存器, 流水线运算

Abstract:

This paper describes LDPC coding design in the digital television transmission system and FPGA implementation and verification.LDPC code is based on the structure of quasi-cyclic LDPC code in the transmission system,and the check matrix is quasi-cyclic characteristic.The encoding needsagenerator matrixhavingaquasi-cycle characteristics,whichcanbe encodedusing a shift register andthe obtained by the cyclic shiftmatrix isstoredinto the RAM,andsavesthe space requiredofthememory matrix;thepipelinedoperationinthearithmetic modulesaves hardware resources.Then throughQuartus IIsimulation platform,testing、synthesis and simulation is done,and the LDPC code is debugin theStratix II EP2S60F1020C3 DSP Develoment Ezkihardware platformto runcodedresults.Finally,comparedto theMatlabmodelingsimulationresultsto verifythecorrectnessoftheimplementation process.

Key words: quasi cyclic ldpc coding;a cyclic shift register;pipeline calculating