Arman Farhang - New Waveform Candidates for 5G: Options and Opportunities

Transcript

1. 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
   

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2. 1"
   Impact of timing and frequency offsets on
   multicarrier waveform candidates for 5G
   

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3. 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"
   

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4. 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&lte,”&in&IEEE&Globecom&Workshops&(GC&Wkshps)&2013,&pp.&223–228.&
   3"
   

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5. Linear Pulse Shaping
   •  UFMC"signal"in"frequency"domain"
   Fig.&2.&UFMC&signal&representa;on&in&frequency&domain&and&its&comparison&with&OFDM&[1].&
   4"
   

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6. Linear Pulse Shaping
   •  Filter"bank"mul2carrier"(FBMC)"
   Fig.&3.&Filter&bank&mul;carrier&(FBMC)&system&model.&
   5"
   

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7. Circular Pulse Shaping
   Fig.&4.&Filter&bank&mul;carrier&with&circular&pulse&shaping.&
   6"
   

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8. Circular Pulse Shaping
   Fig.&5.&TimeHfrequency&overlapping.&
   7"
   

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9. Circular Pulse Shaping
   •  OFDM"vs."GFDM"or"CJFBMC"data"packet"
   OFDM"
   GFDM"or"CJFBMC"
   8"
   

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10. Linear vs. Circular Pulse Shaping
    Fig.&6.&Linear&FBMC&transmit&signal.& Fig.&7.&Circular&FBMC&transmit&signal.&
    9"
    

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11. 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"
    

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12. 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"
    

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13. Sensitivity to Timing Offset
    Fig.&10.&Mul;ple&access&interference&(MAI)&as&a&func;on&of&;ming&
    offset&for&different&waveforms.&
    12"
    

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14. Sensitivity to Frequency Offset
    Fig.&11.&Mul;ple&access&interference&(MAI)&as&a&func;on&of&
    frequency&offset&for&different&waveforms.&
    13"
    

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15. Sensitivity to Frequency Offset
    Fig.&12.&Amplitude&spectrum&of&the&receiver&matched&filter&(MF)&in&CHFBMC&and&zeroHforcing&(ZF)&detector&
    in&GFDM.&
    14"
    

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16. 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"
    

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17. 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"
    

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18. 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"
    

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19. 18"
    Frequency Spreading Equalization in
    Multicarrier Massive MIMO
    

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20. 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)&
    

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21. •  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
    

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22. •  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)
    

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23. 22"
    Frequency Spreading implementation
    of CMT
    

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24. 23"
    Frequency Spreading implementation
    of CMT
    

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25. •  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.&
    

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26. 25"
    Minimum Mean Square Error
    Frequency Spreading Equalization
    Number of receive antennas
    Number of users
    

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27. 26"
    Minimum Mean Square Error
    Frequency Spreading Equalization
    MMSE estimates of
    MMSE filter tap weights
    Spreading matrix
    Phase adjustment matrix
    

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28. •  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
    .&&
    

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29. Numerical Results
    SIR&performance&&comparison&between&polyphase&implementa;on&(PPN)&and&frequency&spreading&FBMC&systems&having&16&
    subcarriers&&for&different&number&of&receive&antennas.&
    

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30. •  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.&
    

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31. •  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.&
    

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32. Thank"you"
    Any"comments"or"ques2ons?"
    

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