中国空间科学技术

Chinese Space Science and Technology ›› 2017, Vol. 37 ›› Issue (2): 108-113.doi: 10.16708/j.cnki.1000-758X.2017.0029

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StudyoncommunicationperformanceimprovementusingLDPCcodeunderpassiveintermodulationinterference

 FANG  Tian-Qi1, HU  Tian-Cun2, TIAN  Lu1,*, LIU  Jian-Chun1   

  1. 1SchoolofInformationandElectronics，BeijingInstituteofTechnology，Beijing100081，China
    2NationalKeyLaboratoryofScienceandTechnologyonSpaceMicrowave，ChinaAcademyofSpaceTechnology（Xi′an），Xi′an710000，China
  • Received:2016-11-22 Revised:2017-02-15 Published:2017-04-25 Online:2017-03-17

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Abstract: Duetothetimevaryinganddiscontinuouscharacteristicsofpassiveintermodulationinterferencesignals，anovelmethodbyusingerrorcorrectingLDPCcodewasproposedtoreducetheimpactofpassiveintermodulationinterference.TheLDPCcodinganddecodingschemewasdesignedandthedecodingpartwasemphasized.Thenormalizedminsumalgorithmbasedonrowmessagepassingwasadoptedforitslowiterationtime.Pulsesat10%dutycyclewereusedtosimulatethepassiveintermodulationinterference.Thesimulationresultsshowthatthecodinggainisabout8.2dBwhentheBERis3.1dB. TheexperimentalresultsshowthattheBERis0.00269andSIRgainreaches10dBwhenSIRis2dB.

Key words: spacecommunication, passiveintermodulation, lowdensityparitycheckcode, minsumdecoding, biterrorrate