3g cdma-wcdma-and-cdma20003062
TRANSCRIPT
3G CDMA - WCDMA and cdma2000
Rodger E. ZiemerIEEE Communications SocietyDistinguished Lecturer Program
May 28-June1, 2001 R. Z. Ziemer, Colorado Springs, CO
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Rules for Efficient Multiple Access Three laws
Know the channelMinimize interference to othersMitigate interference received from others
Requirements of wireless multiple accessChannel measurementChannel control and modificationMultiple user channel isolation
May 28-June1, 2001 R. Z. Ziemer, Colorado Springs, CO
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Why CDMA? Higher capacity Improved performance in multipath by diversity Lower mobile transmit power = longer battery life
Power control Variable transmission rate with voice activity detection
Allows soft handoff Sectorization gain High peak data rates can be accommodated Combats other-user interference = lower reuse factors
May 28-June1, 2001 R. Z. Ziemer, Colorado Springs, CO
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What is Third Generation? [1] Flexible support of multiple services
Voice Messaging – email, fax, etc. Medium-rate multimedia – Internet access, educational High-rate multimedia – file transfer, video High-rate interactive multimedia – video telecon-ferencing,
telemedicine, etc. Mobility: quasi-stationary to high-speed platforms Global roaming: ubiquitous, seamless coverage Evolution from second generation systems
May 28-June1, 2001 R. Z. Ziemer, Colorado Springs, CO
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W-CDMA Versus cdma2000 [2]Parameter W-CDMA cdma2000Carrier spacing 5 MHz 3.75 MHzChip rate 4.096 MHz 3.6864 MHzData modulation BPSK FW – QPSK; RV - BPSKSpreading Complex (OQPSK) Complex (OQPSK)Power control frequency 1500 Hz 800 HzVariable data rate implement. Variable SF; multicode Repet., puncturing, multicodeFrame duration 10 ms 20 ms (also 5, 30, 40)Coding Turbo and convolutional Turbo and convolutionalBase stations synchronized? Asynchronous SynchronousBase station acquisition/detect 3 step; slot, frame, code Time shifted PN correlationForward link pilot TDM dedicated pilot CDM common pilotAntenna beam forming TDM dedicated pilot Auxiliary pilot
May 28-June1, 2001 R. Z. Ziemer, Colorado Springs, CO
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WCDMA Uplink Frame Structure [1]DPDCHI: data channel
Q: sync & control DPCCH
)6,,0( bits 2*10 k kN data
chips 2560 slotT
bits pilotNPilot: TFCI FBI TPC
TFCI = transmit format combination indicatorFBI = feedback informationTPC = transmit power control
DPDCH = dedicated physical data channelDPCCH = dedicated physical control channel
ms 667.0
slot 0 slot 1 slot i slot 14
radio frame = 10 ms
May 28-June1, 2001 R. Z. Ziemer, Colorado Springs, CO
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WCDMA Uplink Modulator Structure [1]
pulse shapefilter (SRC)
pulse shapefilter (SRC)
d
d
d
c
1,dc
)cos( tc
)sin( tc
2,dc
3,dc
cc
DPDCH1
DPDCH2
DPDCH3
DPCCH
I
Q
long,1c long,2c
+
+
+
-
+
+
May 28-June1, 2001 R. Z. Ziemer, Colorado Springs, CO
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Orthogonal Variable Spreading Factor Codes
00
0
000000000000
01
0011
0101
0110
00001111
00110011
00111100
01010101
01011010
01100110
01101001
Cd, i selected from this tree Notes:1) For fixed chip rate, desired information rate determines length of spreading sequence and therefore processing gain.2) When a specific code is used, no other code on the path from that code to the root and or on the subtree beneath that code may be used.3) All the codes at any depth into the tree are the set of Walsh Sequences.4) Code phase is synchronous with information symbols.5) FDD UL processing gain between 256 and 4 FDD DL processing gain between 512 and 4 TDD UL/DL processing gain between 16 and 16) Multicode used only for SF = 4
May 28-June1, 2001 R. Z. Ziemer, Colorado Springs, CO
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WCDMA Downlink Frame Structure [1]
DPDCH DPCCH
chips 2560 slotT
TFCI PilotTPC
ms 667.0
slot 0 slot 1 slot i slot 14
radio frame = 10 ms
DPDCHDPCCH
1 dataN 2 dataNData1 Data2
)7,,0( bits 2*10 22 kNN kdatadata
May 28-June1, 2001 R. Z. Ziemer, Colorado Springs, CO
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WCDMA Downlink Modulator Structure [1]
long,2c
tje
long C
long C
pulse shapefilter (SRC)
PrimarySync Code
SecondarySync Code
1 G
nG
PG
SG
sum
1,dc
ndc ,
PC
SC
dedicatedtraffic channels
primary &secondarycommon pilotchannels
primary &secondarycommoncontrolchannels
other channels
s/p
s/p
May 28-June1, 2001 R. Z. Ziemer, Colorado Springs, CO
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Transmit Diversity Strategy for Downlink
May 28-June1, 2001 R. Z. Ziemer, Colorado Springs, CO
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cdma2000 Uplink Frame Structure
CRCencodertail bits
Convolutionalor Turbo Coder
symbolrepetition
symbolpuncture
blockinterleaver
modulation symbol
Cchannel
bits
Bits/Frame1640 80 172350744151230486120
CRC bits668121616161616
tail bits888888888
Data Ratekbps1.52.74.89.619.238.476.8153.6307.2
CodeRate1/41/41/41/41/41/41/41/41/2
Repeats1684211111
Delete1 of 51 of 9nonenone none none none none none
Symbols153615361536153615363072 6144 12288 12288
Radio Configuration 3
C.S.0002-A-1 Fig 2.1.3.1.1.1-8
May 28-June1, 2001 R. Z. Ziemer, Colorado Springs, CO
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cdma2000 Uplink Modulator
C
C
C
A
B
d
d
d
c
)cos( tc
)sin( tcIlong,c
Qlong,c
+
+
+
+
+
_
sum
sum1 Dw
Cw
2 Sw
1 Sw
PrimaryTraffic
SecondaryTraffic 1
SecondaryTraffic 2
Control
Pilot
pulseshape
pulseshape
May 28-June1, 2001 R. Z. Ziemer, Colorado Springs, CO
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cdma2000 Downlink Frame Structure
Other similar tables in specification.
Bits/Frame2155 125 267552112822804584919220712
CRC bits681012161616161616
tail bits8888888888
Data Ratekbps1.83.67.214.428.857.6115.2230.4460.81036.8
CodeRate1/21/21/21/21/21/21/21/21/21/2
Repeats8421111111
Deletenonenonenonenone none none none nonenone2 of 18
Symbols57657657657611522304 4608 92161843236864
Radio Configuration 9
CRCencodertail bits
Convolutionalor Turbo Coder
symbolrepetition
symbolpuncture
blockinterleaver
modulation symbol
channel bits
W
May 28-June1, 2001 R. Z. Ziemer, Colorado Springs, CO
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cdma2000 1X DL Modulation Processing+
longcode
longcodemask
0 11 -1
channelgain
fwd pwrctrl gain po
wer
con
trol
sym
bol p
unct
ure
DE
MU
X
decimate pwr ctrlbit pos
I/Q scrambling bit extract
powercontrol
bits
puncturetiming800 Hz
W
YQ
YI
C.S.0002-A-1 Fig 3.1.3.1.1.1-18
modulationsymbol
rate
May 28-June1, 2001 R. Z. Ziemer, Colorado Springs, CO
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cdma2000 1X Downlink Modulation
I channelpilot PN
Q channelpilot PN
Walsh code
QOF code
IY
QY
pulseshape
pulseshape
+
+
+
-
)cos( tc
)sin( tc
otherchannels
otherchannels
phas
e ro
tate
for Q
OF
QX
IX
May 28-June1, 2001 R. Z. Ziemer, Colorado Springs, CO
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cdma2000 3X DL Modulation Processing+
longcode
longcodemask
0 11 -1
channelgain
fwd pwrctrl gain po
wer
con
trol
sym
bol p
unct
ure
DE
MU
X
decimate pwr ctrlbit pos
I/Q scrambling bit extract
powercontrol
bits
puncturetiming800 Hz
W YQ1
YI1
modulationsymbol
rate
YQ2
YI2
YQ3
YI3
May 28-June1, 2001 R. Z. Ziemer, Colorado Springs, CO
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cdma2000 3X Downlink Modulationsame as below
same as above
outputcarrier 1
outputcarrier 2
outputcarrier 3
YQ1
YI1
YQ2
YI2
YQ3
YI3
May 28-June1, 2001 R. Z. Ziemer, Colorado Springs, CO
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cdma2000 vs WCDMA Chip rate Coherent Pilot Channels Transmit Diversity Underlying Network Single Carrier versus Multicarrier Spreading Cell Site Synchronization
May 28-June1, 2001 R. Z. Ziemer, Colorado Springs, CO
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References[1] R. L. Peterson, “Third Generation Personal Communications: Physical Layer
Status,” Presentation at Clemson University, Feb. 1, 2001[2] Manjit Singh and Manoneet Singh, “3G Wireless with Respect to IMT-2000 and
Beyond,” Telecom 99[3] Harri Holma and Antti Toskala, WCDMA for UMTS: Radio Access for Third
Generation Mobile Communications, New York: Wiley, 2000[4] “CDMA Evolution from IS-95, IS-2000, to 1XTREME,” Technology Transfer
Training Class, Motorola, Inc., July 2000[5] R. Ziemer and R. Peterson, Introduction to Digital Communications, Upper
Saddle River, NJ: Prentice Hall, Chapter 10, 2001
May 28-June1, 2001 R. Z. Ziemer, Colorado Springs, CO
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WCDMA: More Information? http://www.3gpp.org
21.101 guide to all other documents 25.XXX series radio access network (RAN)
25.211 frame structure etc. 25.212 channel coding etc. 25.213 spreading and modulation 25.214 physical layer procedures (tx diversity, etc.) 25.321 medium access control (MAC) 25.322 radio link control (RLC)
26.XXX series voice coding
May 28-June1, 2001 R. Z. Ziemer, Colorado Springs, CO
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GSM/GPRS/EDGE: More Information? http://www.3gpp.org
multiple access, logical channels, etc05.0245.002
general description05.0145.001
modulation05.0445.004
channel coding05.0345.003
RLC/MAC04.6044.060
link adaptation05.0945.009
radio link control05.0845.008
radio transmission and channel models05.0545.005
descriptionETSI3GPP
May 28-June1, 2001 R. Z. Ziemer, Colorado Springs, CO
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cdma2000: More Information? http://www.3gpp2.org
Technical Specification Group C cdma2000C.S0002-A-1 Physical Layer StandardC.S0003-A-1 Medium Access Control (MAC)C.S0004-A-1 Signaling Link Access Control C.S00024 1XEV-DO (high speed packet)C.S0005 Upper Layer Signaling (L3)
May 28-June1, 2001 R. Z. Ziemer, Colorado Springs, CO
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3G Information Sources Third Generation Partnership Projects
http://www.3gpp.org http://www.3gpp2.org
CDMA Development Group (CDG) http://www.cdg.org
International Mobile Telecommunications for the year 2000 http://www.tiaonline.org/standards/sfg/imt2k/
Japan ARIB IMT-2000 proposal http://www.arib.or.jp/IMT-2000/ARIB/Document/