简介：Akindofnovelbinaryphasecodenamedsidelobesuppressioncodeisproposedinthispaper.Itisdefinedtobethecodewhosecorrespondingoptimalsidelobesuppressionfilteroutputstheminimumsidelobes.Itisshownthattheredoexistsidelobesuppressioncodesbetterthantheconventionaloptimalcodes-Barkercodes.Forexample,thesidelobesuppressioncodeoflength11withfilteroflength39hasbettersidelobelevelupto17dBthanthatofBarkercodewiththesamecodelengthandfilterlength.

简介：改进了并置的超级正向纠错(super-FEC)的三个新奇计划代码在长拖光传输系统的发展趋势和存在FEC代码的缺点以后被建议被分析了。芦苇贤明之人(RS)+Bose-Chaudhuri-Hocguenghem(BCH)的性能模拟内部外部的连续并置的代码被实现，编码/译码并置平行的代码的概念被介绍。而且，模拟为RS结果(255，239)+RS(255，239)代码和theRS(255，239)+RS(255，223)二连续并置的代码是有这的一个优异编码方案的代码表演与经典RS相比作为更好的纠错，中等冗余性和容易的实现有利(255，239)代码和其它代码，并且他们的信号噪声比获得是分别地多于RS的2～3dB(255，239)在1x10~的误码率的代码(-13)。最后，新奇连续并置的代码的帧结构被安排在设计它的硬件打一个坚挺的基础。

简介：ThislettergivesarandomconstructionforLowDensityParityCheck(LDPC)codes,whichusesaniterativealgorithmtoavoidshortcyclesintheTannergraph.TheconstructionmethodhasgreatflexiblechoiceinLDPCcode'sparametersincludingcodelength,coderate,theleastgirthofthegraph,theweightofcolumnandrowintheparitycheckmatrix.ThemethodcanbeappliedtotheirregularLDPCcodesandstrictregularLDPCcodes.Systemiccodeshavemanyapplicationsindigitalcommunication,sothisletterproposesaconstructionofthegeneratormatrixofsystemicLDPCcodesfromtheparitycheckmatrix.Simulationsshowthatthemethodperformswellwithiterativedecoding.

简介：ThemultilevelmodulationtechniquesofM-DifferentialAmplitudePhaseShiftKeying(DAPSK)havebeenproposedincombinationwithTurbocodeschemefordigitalradiobroadcastingbandsbelow30MHzradiochannel.ComparisonofthismodulationmethodwithchannelcodinginanAdditiveWhiteGaussianNoise(AWGN)andmulti-pathfadingchannelshasbeenpresented.TheanalysisprovidesaniterativedecodingoftheTurbocode.

简介：Space-TimeBlock(STB)codehasbeenaneffectivetransmitdiversitytechniqueforcombatingfadingduetoitsorthogonaldesign,simpledecodingandhighdiversitygains.Inthispaper,aunit-ratecomplexorthogonalSTBcodeformultipleantennasinTimeDivisionDuplex(TDD)modeisproposed.Meanwhile,TurboCoding(TC)isemployedtoimprovetheperformanceofproposedSTBcodefurtherbyutilizingitsgoodabilitytocombatthebursterroroffadingchannel.Comparedwithfull-diversitymultipleantennasSTBcodes,theproposedcodecanimplementunitrateandpartialdiversity;andithasmuchsmallercomputationalcomplexityunderthesamesystemthroughput.Moreover,theapplicationofTCcaneffectivelymakeupfortheperformancelossduetopartialdiversity.SimulationresultsshowthatontheconditionofsamesystemthroughputandconcatenationofTC,theproposedcodehaslowerBitErrorRate(BER)thanthosefull-diversitycodes.

简介：TheionospherictimedelayisoneofthemainerrorsourcesinC/AcodeGPSnavigationandpositioningapplications.Inthispaper,amethodisproposedforreal-timedual-frequencyionospherictime-delaycorrectingusingaC/AcodeGPSreceiver,andtheprincipleofthecircuitblockdiagramforthismethodisanalyzedwithitsfeasibilitytheoreticallydemonstrated.