umts transmit diversity
TRANSCRIPT
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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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