Effect of Controlling Parameters of Tone Reservation Based on Null Subcarriers (TRNS) on the Performance of OFDM Systems

Int. J. Sociotechnology Knowl. Dev. Pub Date : 2020-04-01 DOI:10.4018/ijskd.2020040103

Mohamed Mounir, M. B. Mashade

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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

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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

高数据率通信系统通常实现正交频分复用(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子运营商(TRNS)isdownwardcompatibleversionofToneReservation(TR)withsmallexcessin theaveragepowerandlowcomputationalcomplexitycomparedtoothers。Aswillbeshown，TRNS是四种向下兼容技术中最实用的一种。trns_的性能为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。关键词正交频分复用(OFDM)，峰值平均功率比(PAPR)，基于零子载波(TRNS)的音调保留国际社会技术与知识发展杂志第12卷第2期2020年4月- 6月

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Int. J. Sociotechnology Knowl. Dev.

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