| Irregular and regular LDPC codes with high spectrum efficiency modulation in image transmission over fading channel |
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| 作者姓名： | Ma Piming & Yuan DongfengSchool of Information Science and Engineering Shandong University Jinan P. R. China |
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| 作者单位： | Ma Piming & Yuan DongfengSchool of Information Science and Engineering，Shandong University，Jinan 250100，P. R. China |
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| 基金项目： | ThisprojectwassupportedbytheNationalNaturalScienceFoundationofChina(60372030)，ChinaEducationMinistryFoundationforVisitingScholar([2003]406)，KeyProjectofProvincialScientificFoundationofShandong(Z2003G02). |
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| 摘 要： | 1.INTRODUCTION Low densityparity check(LDPC)codes,firstintroduced byGallagerin1963,havenearShannonlimitperformance whendecodedusinganiterativeprobabilisticalgorithm1,2]. Lubyetal,constructedirregularLDPCcodesandshowed thatirregularcodesperformedbetterthanregularones3]. AndthenRichardsonandUrbankedevelopedadensityevo lutionalgorithmtoanalyze,designtheirregularLDPC codes4].Bythismethod,theyconstructedtheLDPCcodes thatclearlybeatthepowerfulTURBOcodes5]. Ontheotherhand,wirele…
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Irregular and regular LDPC codes with high spectrum efficiency modulation in image transmission over fading channel |
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| Ma Piming & Yuan DongfengSchool of Information Science and Engineering,Shandong University,Jinan ,P. R. China.Irregular and regular LDPC codes with high spectrum efficiency modulation in image transmission over fading channel[J].Journal of Systems Engineering and Electronics,2005,16(1). |
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| Authors: | Ma Piming YUAN Dongfeng |
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| Institution: | School of Information Science and Engineering, Shandong University, Jinan 250100, P. R. China |
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| Abstract: | If the degree distribution is chosen carefully, the irregular low-density parity-check (LDPC) codes can outperform the regular ones. An image transmission system is proposed by combining regular and irregular LDPC codes with 16QAM/64QAM modulation to improve both efficiency and reliability. Simulaton results show that LDPC codes are good coding schemes over fading channel in image communication with lower system complexity. More over, irregular codes can obtain a code gain of about 0.7 dB compared with regular ones when BER is 10 -4. So the irregular LDPC codes are more suitable for image transmission than the regular codes. |
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| Keywords: | irregular low-density parity-check (LDPC) codes degree distribution image transmission high spectrum efficiency modulation |
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