2023年全國碩士研究生考試考研英語一試題真題（含答案詳解+作文范文）_第1頁
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1、Summary:MATLABcodefLDPC(LowDensityParityCheck)CodessimulationovertheAWGNchannel.MATLABRelease:R14Deion:Thezipfilecontains1.A128x256Regular(36)Hmatrix(ifyouneedtosimulateothercodesneedtowriteyourowncodefgeneratingthosepar

2、itycheckmatrices).Thefile128x256regular_v6.matisfthoseusingMatlab6.5.2.FilesfLDPCcodesimulationovertheAWGNchannel.3.MatlabbasedCbased(Cmexfile)implementationoftheLDPCdecoder.Themainsimulationcontainsthecommsftheuseofboth

3、decoders(thereare2CbaseddecodersoneMatlabbased).Thecommsfthedecoderthataregoingtobeusedneedto“uncommented“thoseftheotherdecoderneedtobe“commented“.3a.TocompiletheCmexfileneedtoinstallaCcompiler(IhaveusedMiscosoftVisualC6

4、.0).ThenhavetogototheMatlabcommwindowdo“mexsetup“(thengothroughthestepsofingthedesiredcompiler).Thendo:“mexdecode_ldpc.cpp“(“mexdecode_ldpc_new.cpp“).Thiswillproducea“dll“filebythenameof“decode_ldpc.dll“(“decode_ldpc_new

5、.dll“)thiscanthenbeusedbythemainfsimulation.Iamincludingalreadycompiled“dll“fileswhichwkwithMaltab7.0(Matlab6.5).Howeveriftheincluded“dll“filesdonotwkfyouthenyouhavetocompilethe“.cpp“filesusingthemethodexplainedabove.3b.

6、TheMatlabcodeuses“Sparse“implementationfthevariousmatricesistherefemakesefficientuseofmemy(thismakessomedifferenceifyoulikemeuseastardPCfsimulationareusinglargeHmatricesthathaveblocklengthgreaterthan3000).HoweverifmemyCP

7、UpowernotyourlimitationsthentheCbaseddecoderismuchfaster.4.Thebiterrsarecountedovertheentirecodewd.Themainneedstobemodifiedfcountingbiterrsifasystematicmatrixisbeingused.5.ThemodulationusedisBPSK.Torunasimulation1.Openth

8、efilebythenameof“generic_simulat_nonsys.m“2.LoadaH(paritycheck)matrix3.SettheSNRrange4.SetmaximumnumberofdecoderiterationmaximumnumberoferredcodewdstocountfeachSNRpoint(mustbeatleast30freliableestimatethepapersshowresult

9、sf100200codewderrs.OUCH!!!).5.theCbasedMatlabbasedLDPCdecoder.5A.Thedecoder“decode_ldpc_new“ismuchfasterthan“decode_ldpc“(thedifferenceinspeedincreaseswithblocklength).6.Runthewaitftheresults:).Summary:MATLABcodefLDPC(Lo

10、wDensityParityCheck)CodessimulationovertheAWGNchannel.MATLABRelease:R14Deion:Thezipfilecontains1.A128x256Regular(36)Hmatrix(ifyouneedtosimulateothercodesneedtowriteyourowncodefgeneratingthoseparitycheckmatrices).Thefile1

11、28x256regular_v6.matisfthoseusingMatlab6.5.2.FilesfLDPCcodesimulationovertheAWGNchannel.3.MatlabbasedCbased(Cmexfile)implementationoftheLDPCdecoder.Themainsimulationcontainsthecommsftheuseofbothdecoders(thereare2Cbasedde

12、codersoneMatlabbased).Thecommsfthedecoderthataregoingtobeusedneedto“uncommented“thoseftheotherdecoderneedtobe“commented“.3a.TocompiletheCmexfileneedtoinstallaCcompiler(IhaveusedMiscosoftVisualC6.0).ThenhavetogototheMatla

13、bcommwindowdo“mexsetup“(thengothroughthestepsofingthedesiredcompiler).Thendo:“mexdecode_ldpc.cpp“(“mexdecode_ldpc_new.cpp“).Thiswillproducea“dll“filebythenameof“decode_ldpc.dll“(“decode_ldpc_new.dll“)thiscanthenbeusedbyt

14、hemainfsimulation.Iamincludingalreadycompiled“dll“fileswhichwkwithMaltab7.0(Matlab6.5).Howeveriftheincluded“dll“filesdonotwkfyouthenyouhavetocompilethe“.cpp“filesusingthemethodexplainedabove.3b.TheMatlabcodeuses“Sparse“i

15、mplementationfthevariousmatricesistherefemakesefficientuseofmemy(thismakessomedifferenceifyoulikemeuseastardPCfsimulationareusinglargeHmatricesthathaveblocklengthgreaterthan3000).HoweverifmemyCPUpowernotyourlimitationsth

16、entheCbaseddecoderismuchfaster.4.Thebiterrsarecountedovertheentirecodewd.Themainneedstobemodifiedfcountingbiterrsifasystematicmatrixisbeingused.5.ThemodulationusedisBPSK.Torunasimulation1.Openthefilebythenameof“generic_s

17、imulat_nonsys.m“2.LoadaH(paritycheck)matrix3.SettheSNRrange4.SetmaximumnumberofdecoderiterationmaximumnumberoferredcodewdstocountfeachSNRpoint(mustbeatleast30freliableestimatethepapersshowresultsf100200codewderrs.OUCH!!!

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