UMTS Transmit Diversity

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    MSC Mobile Switching Center.....VLR Visitor Location Register.....HLR Home Location Register.....SGSN ..... Serving GPRS Support NodeGGSN Gateway GSN.....GMSC Gateway MSC.....

    UMTS Terrestrial Radio Access Network.....UTRANUMTS Base Station.....Node B

    User Equipment.....UE

    Radio Network.....InterfacesUu/Iu/Iur/Iub .....

    RNC

    External NetworksCore Network

    circuit

    switched

    switched

    packet

    UE

    GMSC

    RNC

    RNC

    Node B

    IuIub

    SGSN GGSN

    HLR

    VLR

    Node B

    Node B

    MSC

    Iur

    Uu

    UTRAN

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    Medium Access Control

    Radio Resource Control

    Physical Layer

    Control

    Transport Channels

    Logical ChannelsL2

    L3

    L1

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    Frequency

    Time

    Power

    ~5MHz

    10ms

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    T =0.667 ms; 2560 chips

    Data1 TPC TFCI Pilot

    DPCCHDPDCH

    Data2

    DPCCH

    One radio frame T =10 ms; 38400 chips

    s

    f

    Slot 1Slot 0 Slot i Slot 14

    DPDCH

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    Antenna 1

    Antenna 2

    AAAAAAAAAAAAAAAAAAAAAAA

    -A -A -A -A -A -A -A -A -A -A-A-A

    Slot 14 Slot 1Slot 0

    A A A A A A A A A A A

    Frame Boundary

    Frame i+1Frame i

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    S D

    NFBI

    Pilot TFCI FBI TPC

    Slot 14Slot iSlot 1Slot 0

    T =0.667 ms; 2560 chipss

    fOne radio frame T =10 ms; 38400 chips

    DPCCH

    S dl,n

    Split

    real &

    imag.

    parts

    shaping

    Pulse-

    C ch,SF,mS/PDPCH

    shaping

    Pulse-Re

    cos( t)

    sin( t)

    Im

    I+jQ

    Q

    I

    j

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    SF=8SF=1

    C =(1)

    C =(1,1)

    C =(1,-1)

    SF=2

    C =(1,1,1,1)

    C =(1,1,-1,-1)

    C =(1,-1,1,-1)

    C =(1,-1,-1,1)

    SF=4

    ch,1,0

    ch,2,0

    ch,2,1

    ch,4,0

    ch,4,1

    ch,4,2

    ch,4,3

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    g (x)2

    g (x)1

    c i

    LFSR2

    LFSR1clock m-sequence1

    m-sequence2

    Gold-sequence

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    0 1 2 3 4 50

    0.1

    0.2

    0.3

    0.4

    0.5

    0.6

    0.7

    r

    p

    df r(r)

    Rayleigh (K=0)Rice (K=1)Rice (K=5)NLOS

    LOS

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    0 1 2 3 4 50

    0.1

    0.2

    0.3

    0.4

    0.5

    0.6

    0.7

    0.8

    0.9

    a

    pdf a(a)

    A=4,

    A=1.4

    A=8,

    A=1.4

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    Finger2

    Codegenerator

    ic(t- ) h ( )^ * ii

    h ( )^ 1

    *11c(t- )

    Timing

    i

    ^h( )

    1r (t)~

    r(t)

    ~MRCr (t)

    Conjugate

    Correlator

    Finger1

    FingerK

    estimationChannel

    Pilot

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    CPICH2w2

    Weight Generation

    Determine FBI message

    from Uplink DPCCH

    w2

    CPICH1

    w1

    w1

    Time

    MUX

    Antenna 1

    Antenna 2

    Tx

    Rx

    Rx

    Txspread/scramble

    DPCHDPCCH

    DPDCH

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    FSM ph FSM po

    phN poN

    Nw

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    weighting

    DLslot(j+1)weighting

    w(i)

    UEUTRAN

    ULslot(i)

    FSM(i)

    (a) (b)

    DLslot(j)

    UEUTRAN

    FSM(i)

    ULslot(i)

    ULslot(i+1)

    DLslot(j)

    DLslot(j+1)

    DLslot(j+2)

    w(i)1024148chips

    1024148chips

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    Q =

    Re{w }2

    Im{w }2

    Re{w }2

    Im{w }2

    = 0Q = 0Q

    Q =

    w2 w2

    r = 0 r = /2

    Slot#: i = 0,2,4,6,8,10,12,14 Slot#: i = 1,3,5,7,9,11,13

    Re{w }2

    Im{w }2

    00

    11

    10

    01

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    Im{w }2

    Re{w }2110

    111101

    000

    100

    001 010

    011

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    CPICH 1-4

    Estimation on

    Channel

    Multiplex to

    DPCCH

    Long-term

    Feedback

    Short-term

    Feedback

    1 v, ..., beamv N

    Eigenbeams

    Calculation of Eigenbeam

    Selection

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    Sdl,nCch,SF,m

    DPCHGeneration

    Channel1

    Channel2

    noiseCPICH1,2 CPICH1,2

    Pilotdedicated1,2

    Weighting

    Feedback

    Feedback

    Generation

    RakeEstimation

    Channel

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    1.5 1 0.5 0 0.5 1 1.50

    0.5

    1

    1.5

    2

    2.5

    /max

    PB

    ()

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    TcTcTc

    L-1h (t)

    r(t)

    h (t) h (t) h (t) h (t)0 1 2 L

    s(t)

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    0 5 10 15 20

    105

    104

    103

    102

    101

    100

    BER

    Eb/N

    0(dB)

    ideal cond: 1 user, SF 64, 1000 frames, 3km/h, 1 tap, 1 finger

    ideal cond.1 ant

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    0 5 10 15 2010

    5

    10

    4

    103

    102

    101

    100

    BER

    Eb/N

    0(dB)

    1 user, SF 64, 1000 frames, 3km/h, 4 taps, 4 fingers

    ideal cond.mode1mode2

    1 ant

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    0 5 10 15 2010

    5

    104

    103

    102

    101

    100

    BER

    Eb/N

    0(dB)

    mode1: 1 user, SF 64, 1000 frames, 3km/h

    flat2 taps4 taps6 taps9 taps

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    0 5 10 15 2010

    5

    104

    103

    102

    101

    100

    BER

    Eb/N

    0(dB)

    mode2: 1 user, SF 64, 1000 frames, 3km/h

    flat2 taps4 taps6 taps9 taps

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    0 2 4 6 8 100

    1

    2

    3

    4

    5

    6

    requiredEb

    /N0

    (dB)

    delay taps

    BER=101

    , 1 user, SF 64, 1000 frames, 3km/h

    mode1mode21 ant

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    0 5 10 15 2010

    4

    103

    102

    101

    100

    BER

    Eb/N

    0(dB)

    mode1: 1 user, SF 64, 1000 frames, 4 taps, 4 fingers

    v=3km/hv=10km/hv=30km/hv=50km/h

    v=70km/hv=100km/hv=120km/h

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    0 5 10 15 2010

    4

    103

    102

    101

    100

    BER

    Eb/N

    0(dB)

    mode2: 1 user, SF 64, 1000 frames, 4 taps, 4 fingers

    v=3km/hv=10km/hv=30km/hv=50km/hv=70km/hv=100km/hv=120km/h

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    0 20 40 60 80 100 1202.5

    3

    3.5

    4

    4.5

    5

    requiredEb

    /N0

    (dB)

    v (km/h)

    BER=101

    ,1 user, SF64,1000 frames,4 taps,4 fingers

    mode1mode21 ant

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    0 5 10 15 2010

    5

    104

    103

    102

    10

    1

    100

    BER

    Eb/N

    0(dB)

    mode1: 1 user, SF 64, 1000 frames, 3km/h, 4 taps, 4 fingers

    =0.2

    =0.5

    =0.7

    =0.9

    =1

    1 ant

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    0 5 10 15 2010

    5

    104

    103

    102

    101

    100

    BER

    Eb/N

    0(dB)

    mode2: 1 user, SF 64, 1000 frames, 3km/h, 4 taps, 4 fingers

    =0.2

    =0.5

    =0.7=0.9

    =1

    1 ant

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    0.2 0.4 0.6 0.8 12.5

    3

    3.5

    4

    4.5

    requiredEb

    /N0

    (dB)

    BER=101

    ,1 user, SF64,1000 frames,4 taps,4 fingers

    mode1mode21 ant

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    0 5 10 15 2010

    5

    104

    103

    102

    101

    100

    BER

    Eb/N

    0(dB)

    mode1 & 2: 1 user, SF 64, 1000 frames, 3km/h, 4 taps, 4 fingers

    mode1 no FB errorsmode2 no FB errorsmode1 2% FB errors

    mode2 2% FB errorsmode1 4% FB errorsmode2 4% FB errorsmode1 8% FB errorsmode2 8% FB errors1 ant

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    0 2 4 6 82.5

    3

    3.5

    4

    4.5

    5

    requiredEb

    /N0(

    dB)

    FB error (%)

    BER=101

    ,1 user, SF64,1000 frames, 3km/h, 4 taps,4 fingers

    mode1mode21 ant

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    0 2 4 6 83

    3.5

    4

    4.5

    5

    5.5

    requ

    iredEb

    /N0

    (dB)

    FB error (%)

    BER=101

    ,1 user, SF64,1000 frames, 3km/h,4 taps,4 fingers

    mode1 without AVmode1 with AVmode1 ideal AV1 ant

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    101

    100

    103

    102

    101

    100

    BER

    BLER

    BLER versus gross BER in the downlink of UMTS FDD

    28 kbit/s

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