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Arman Farhang - New Waveform Candidates for 5G: Options and Opportunities
SCEE Team
June 16, 2015
Research
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Arman Farhang - New Waveform Candidates for 5G: Options and Opportunities
SCEE Team
June 16, 2015
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Transcript
New Waveform Candidates for 5G: Options and Opportunities Arman&Farhang& TRINITY
COLLEGE D U B L I N June 16, 2015 Supélec campus de Rennes
1" Impact of timing and frequency offsets on multicarrier waveform
candidates for 5G
Waveform Candidates for 5G Waveform&Candidates& Linear&pulse&shaping& Circular&pulse&shaping& Universal&filtered&mul;carrier&(UFMC)& & Filter&bank&mul;carrier&(FBMC)&
Generalized&frequency&division& mul;plexing&(GFDM)& Circular&filter&bank&mul;carrier&(CHFBMC)& 2"
Fig.&1.&UFMC&system&model&in&the&uplink&[1].& Linear Pulse Shaping • Universal"filtered"mul2carrier"(UFMC)" [1]&V.&Vakilian,&T.&Wild,&F.&Schaich,&S.&Ten&Brink,&and&J.HF.&Frigon,&“UniversalHfiltered&mul;Hcarrier&technique&for&wireless&systems& beyond<e,”&in&IEEE&Globecom&Workshops&(GC&Wkshps)&2013,&pp.&223–228.& 3"
Linear Pulse Shaping • UFMC"signal"in"frequency"domain" Fig.&2.&UFMC&signal&representa;on&in&frequency&domain&and&its&comparison&with&OFDM&[1].& 4"
Linear Pulse Shaping • Filter"bank"mul2carrier"(FBMC)" Fig.&3.&Filter&bank&mul;carrier&(FBMC)&system&model.& 5"
Circular Pulse Shaping Fig.&4.&Filter&bank&mul;carrier&with&circular&pulse&shaping.& 6"
Circular Pulse Shaping Fig.&5.&TimeHfrequency&overlapping.& 7"
Circular Pulse Shaping • OFDM"vs."GFDM"or"CJFBMC"data"packet" OFDM" GFDM"or"CJFBMC" 8"
Linear vs. Circular Pulse Shaping Fig.&6.&Linear&FBMC&transmit&signal.& Fig.&7.&Circular&FBMC&transmit&signal.& 9"
Impact of Synchronization Errors on Waveform Candidates for 5G Receiver"window"
User"1" User"2" User"3" User"4" Fig.&8.&Timing&misalignment&between&different&users.& Fig.&9.&Frequency&misalignment&between&different& users.& 10"
Timing and Frequency Misalignment Transmit"signal"of"user" Received"signal"at"the"base"sta2on" Signal"of"user"""""aTer"going"through" the"channel" TransmiUed"symbols" es2mated"at"the"base"
sta2on" 11"
Sensitivity to Timing Offset Fig.&10.&Mul;ple&access&interference&(MAI)&as&a&func;on&of&;ming& offset&for&different&waveforms.& 12"
Sensitivity to Frequency Offset Fig.&11.&Mul;ple&access&interference&(MAI)&as&a&func;on&of& frequency&offset&for&different&waveforms.& 13"
Sensitivity to Frequency Offset Fig.&12.&Amplitude&spectrum&of&the&receiver&matched&filter&(MF)&in&CHFBMC&and&zeroHforcing&(ZF)&detector& in&GFDM.& 14"
Sensitivity to Timing and Frequency Offset Fig.&13.&Bit&error&rate&(BER)&performance&of&different&waveforms.&The& normalized&TOs&and&CFOs&are&selected&randomly&between&H0.5&and&+0.5.& 15"
Sensitivity to Timing and Frequency Offset Fig.&14.&BER&performance&of&different&waveforms.&The&users&are&quasiH synchronous&in&;me&and&the&CFO&errors&are&selected&randomly&between& H0.5&and&+0.5.& 16"
Conclusions • To"reduce"sensi2vity"to"2ming"and"frequency"offsets,"windows" with"smooth"edges"should"be"applied"to"both"transmiUer"and" receiver." • Among"all"the"waveforms,"FBMC"and"UFMC"par2ally"sa2sfy"this" condi2on."" • OFDM,"GFDM,"and"CJFBMC"fail"our"tests"as"they"lack"windowing"
in"their"conven2onal"form."However,"improvements"are" possible"in"these"waveforms." 17"
18" Frequency Spreading Equalization in Multicarrier Massive MIMO
New Waveforms and Massive MIMO for 5G 19" Waveform&Candidates& Linear&pulse&shaping&
Circular&pulse&shaping& Filter&bank&mul;carrier&(FBMC)& & Universal&filtered&mul;carrier&(UFMC)& Generalized&frequency&division& mul;plexing&(GFDM)& Circular&filter&bank&mul;carrier&(CHFBMC)&
• Massive"MIMO:"a"mul2user"system"similar"to"code" division"mul2plexing"(CDMA)"systems" Base" sta2on" MT1" . " . "
. MTK" . " . " . H11" HKM" 1" M" 20" New Waveforms and Massive MIMO for 5G
• CMT"modula2on" (a)&Spectra&of&baseband&data&streams&(black)&and&ves;gial&side&band&(VSB)&por;on&of&each&(other&colors).&(b)&CMT& spectrum&consis;ng&of&modulated&versions&of&the&VSB&spectra&of&the&baseband&data&streams.&VSB&signals&are&modulated& to&the&subcarrier&frequencies&f 0 ,&f 1 ,&"#"#"#,&fN−1 .&
[1]&B.&FarhangHBoroujeny&and&C.&(George)&Yuen,&“Cosine&modulated&and&offset&qam&filter&bank&mul;carrier&techniques:&a& con;nuousH;me&prospect,”&EURASIP#Journal#on#Applied#Signal#Processing,#2010,#special#issue#on#Filter#Banks#for#Next# GeneraEon#MulEcarrier#Wireless#CommunicaEons,&vol.&2010,&p.&16&pages,&2010.& 21" Cosine Modulated Multitone (CMT)
22" Frequency Spreading implementation of CMT
23" Frequency Spreading implementation of CMT
• SelfJequaliza2on"property"of"FBMC,"[2],"makes"it"a"viable"candidate"for" MIMO"applica2on." " • CMT"offers"the"following"advantages"over"OFDM:" – Higher""bandwidth"efficiency" – Lower"sensi2vity"to"CFO"
– Lower"PAPR" – More"flexible"carrier"aggrega2on" – Blind"channel"equaliza2on"capability"enabling"pilot"decontamina2on,"[3]" 24" Filter Bank Multicarrier for Massive MIMO ! [2]&A.&Farhang,&N.&Marchej,&L.&Doyle,&B.&FarhangHBoroujeny,&“Filter#Bank#MulEcarrier#for#Massive#MIMO”,&In&Proc.&Of&IEEE& VTCHFall&2014,&Vancouver.& [3]&A.&Farhang,&&A.&Aminjavaheri,N.&Marchej,&L.&Doyle,&B.&FarhangHBoroujeny,&“Pilot#decontaminaEon#in#CMTMbased#massive# MIMO#Networks”,&In&proc.&of&ISWCS&2014.&Barcelona.&
25" Minimum Mean Square Error Frequency Spreading Equalization Number of
receive antennas Number of users
26" Minimum Mean Square Error Frequency Spreading Equalization MMSE estimates
of MMSE filter tap weights Spreading matrix Phase adjustment matrix
• Single"user"case" 27" Numerical Results (a)&and&(b)&compare&the&signal&to&interference&ra;o&(SIR)&performance&of&the&MF&linear&combining&technique&for&the& cases&of&8&and&16&subcarriers,&respec;vely,&for&different&number&of&receive&antennas,&Nr .&&
Numerical Results SIR&performance&&comparison&between&polyphase&implementa;on&(PPN)&and&frequency&spreading&FBMC&systems&having&16& subcarriers&&for&different&number&of&receive&antennas.&
• Mul2user"case" Numerical Results Signal&to&noise&plus&interference&(SINR)&performance&of&MMSE&linear&combining&for&the&case&of&having&16&subcarriers&and&6&users& where&the&receiver&input&signal&to&noise&ra;o&is&H1dB.&
• An"effec2ve"MMSE"equaliza2on"scheme"for"FBMCJbased" massive"MIMO"systems"was"derived." • Frequency"spreading"equaliza2on"enables"us"to"widen"the" subcarrier"bands"further"than"what"was"proposed"in"[2]."" • Further"widening"the"subcarrier"bands"in"frequency"brings" improvements"in"terms"of"bandwidth"efficiency,"robustness"to" carrier"frequency"offset,"peakJtoJaverage"power"ra2o"and"
latency"compared"with"polyphase"based"FBMC"systems." Conclusions [2]&A.&Farhang,&N.&Marchej,&L.&Doyle,&B.&FarhangHBoroujeny,&“Filter#Bank#MulEcarrier#for#Massive#MIMO”,&In&Proc.&Of&IEEE& VTCHFall&2014,&Vancouver.&
Thank"you" Any"comments"or"ques2ons?"