{"title":"基于零子载波(TRNS)的音调保留控制参数对OFDM系统性能的影响","authors":"Mohamed Mounir, M. B. Mashade","doi":"10.4018/ijskd.2020040103","DOIUrl":null,"url":null,"abstract":"High data rate communication systems usually implement Orthogonal Frequency Division Multiplexing(OFDM)tofacefrequencyselectivity.HighPeaktoAveragePowerRatio(PAPR)isan OFDMdisadvantagethatcausesBitErrorRate(BER)degradationandout-of-band(OOB)radiation whenOFDMsignalpassthroughnonlinearPowerAmplifier(PA).Inordertoovercomethisproblem largerInputBack-Off(IBO)isrequired.However, largeIBOdecreases thePAefficiency.PAPR reductiontechniquesareusedtoreducetherequiredIBO,sothatPAefficiencyissaved.Several PAPRreductionmethodsareintroducedinliterature,amongthemToneReservationbasedonNull Subcarriers(TRNS)isdownwardcompatibleversionofToneReservation(TR)withsmallexcessin theaveragepowerandlowcomputationalcomplexitycomparedtoothers.Aswillbeshown,TRNS is the best practical one of the four downward compatible techniques. Performance of TRNS is controlledbythreeparameters;numberofpeakreductiontones(PRTs),predefinedthreshold(Amax), andnumberofiterations(Itr).InordertoincreasePAPRreductiongain,enhanceBERperformance, andreducetherequiredIBOtofollowthegivenpowerspectraldensity(PSD),wehavetochoosethe valuesoftheseparametersadequately.Resultsshowedthat,wehavetoreducethethresholdvalue totheaverage(i.e.Amax=0dB).Also,wehavetoincreasenumberofPRTs.However,wehaveto maintainthespectrumshape.Finally,wehavetochoosemoderatenumberofiterations(e.g.Itr≈50), asexcessiveincreaseinnumberofiterationsisnotuseful,especiallyathighPAPRvalues. KEywORDS Orthogonal Frequency Division Multiplexing (OFDM), Peak To Average Power Ratio (PAPR), Tone Reservation Based On Null Subcarriers (TRNS) International Journal of Sociotechnology and Knowledge Development Volume 12 • Issue 2 • April-June 2020","PeriodicalId":13656,"journal":{"name":"Int. J. Sociotechnology Knowl. Dev.","volume":"2 1","pages":"45-62"},"PeriodicalIF":0.0000,"publicationDate":"2020-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Effect of Controlling Parameters of Tone Reservation Based on Null Subcarriers (TRNS) on the Performance of OFDM Systems\",\"authors\":\"Mohamed Mounir, M. B. Mashade\",\"doi\":\"10.4018/ijskd.2020040103\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"High data rate communication systems usually implement Orthogonal Frequency Division Multiplexing(OFDM)tofacefrequencyselectivity.HighPeaktoAveragePowerRatio(PAPR)isan OFDMdisadvantagethatcausesBitErrorRate(BER)degradationandout-of-band(OOB)radiation whenOFDMsignalpassthroughnonlinearPowerAmplifier(PA).Inordertoovercomethisproblem largerInputBack-Off(IBO)isrequired.However, largeIBOdecreases thePAefficiency.PAPR reductiontechniquesareusedtoreducetherequiredIBO,sothatPAefficiencyissaved.Several PAPRreductionmethodsareintroducedinliterature,amongthemToneReservationbasedonNull Subcarriers(TRNS)isdownwardcompatibleversionofToneReservation(TR)withsmallexcessin theaveragepowerandlowcomputationalcomplexitycomparedtoothers.Aswillbeshown,TRNS is the best practical one of the four downward compatible techniques. Performance of TRNS is controlledbythreeparameters;numberofpeakreductiontones(PRTs),predefinedthreshold(Amax), andnumberofiterations(Itr).InordertoincreasePAPRreductiongain,enhanceBERperformance, andreducetherequiredIBOtofollowthegivenpowerspectraldensity(PSD),wehavetochoosethe valuesoftheseparametersadequately.Resultsshowedthat,wehavetoreducethethresholdvalue totheaverage(i.e.Amax=0dB).Also,wehavetoincreasenumberofPRTs.However,wehaveto maintainthespectrumshape.Finally,wehavetochoosemoderatenumberofiterations(e.g.Itr≈50), asexcessiveincreaseinnumberofiterationsisnotuseful,especiallyathighPAPRvalues. KEywORDS Orthogonal Frequency Division Multiplexing (OFDM), Peak To Average Power Ratio (PAPR), Tone Reservation Based On Null Subcarriers (TRNS) International Journal of Sociotechnology and Knowledge Development Volume 12 • Issue 2 • April-June 2020\",\"PeriodicalId\":13656,\"journal\":{\"name\":\"Int. J. Sociotechnology Knowl. Dev.\",\"volume\":\"2 1\",\"pages\":\"45-62\"},\"PeriodicalIF\":0.0000,\"publicationDate\":\"2020-04-01\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Int. J. Sociotechnology Knowl. Dev.\",\"FirstCategoryId\":\"1085\",\"ListUrlMain\":\"https://doi.org/10.4018/ijskd.2020040103\",\"RegionNum\":0,\"RegionCategory\":null,\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"\",\"JCRName\":\"\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Int. J. Sociotechnology Knowl. Dev.","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.4018/ijskd.2020040103","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
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