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3G CDMA - WCDMA and
cdma2000
Rodger E. Ziemer
IEEE Communications SocietyDistinguished Lecturer Program
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amirin king 2
Rules for Efficient Multile !ccess
"hree la#s
$no# the channel
Minimi%e interference to othersMitigate interference recei&ed from others
Re'uirements of #ireless multile access
Channel measurementChannel control and modification
Multile user channel isolation
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amirin king (
)hy CDM!* +igher caacity
Imro&ed erformance in multiath ,y di&ersity
Lo#er mo,ile transmit o#er - longer ,attery life Po#er control
aria,le transmission rate #ith &oice acti&ity detection
!llo#s soft handoff
Sectori%ation gain +igh eak data rates can ,e accommodated
Com,ats other/user interference - lo#er reuse factors
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amirin king 0
)hat is "hird 1eneration* 34 5le6i,le suort of multile ser&ices
oice
Messaging 7 email8 fa68 etc.
Medium/rate multimedia 7 Internet access8 educational
+igh/rate multimedia 7 file transfer8 &ideo
+igh/rate interacti&e multimedia 7 &ideo telecon/ferencing8
telemedicine8 etc.
Mo,ility9 'uasi/stationary to high/seed latforms
1lo,al roaming9 u,i'uitous8 seamless co&erage
E&olution from second generation systems
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amirin king :
)/CDM! ersus cdma2;;; 24Parameter W-CDMA cdma2000
Carrier sacing : M+% (. M+% (.>?>0 M+%
Data modulation @PS$ 5) 7 APS$B R / @PS$
Sreading Comle6 APS$ Comle6 APS$
Po#er control fre'uency 3:;; +% ?;; +%
aria,le data rate imlement. aria,le S5B multicode Reet.8 uncturing8 multicode
5rame duration 3; ms 2; ms also :8 (;8 0;
Coding "ur,o and con&olutional "ur,o and con&olutional
@ase stations synchroni%ed* !synchronous Synchronous
@ase station ac'uisitionFdetect ( steB slot8 frame8 code "ime shifted PG correlation
5or#ard link ilot "DM dedicated ilot CDM common ilot
!ntenna ,eam forming "DM dedicated ilot !u6iliary ilot
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amirin king >
)CDM! Hlink 5rame Structure 34
DPDCHI: data channel
Q: sync & control DPCCH
E>88;C,its23; k == kNdata
chis2:>; =slotT
,itspilot
NPilot: TFCI FBI TPC
TFCI = transmit format combination indicator
FBI = feedback information
TPC = transmit poer control
DPDCH = dedicated physical data channel
DPCCH = dedicated physical control channel
ms>>
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amirin king ; =slotT
TFCI PilotTPC
ms>>
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amirin king 3;
)CDM! Do#nlink Modulator Structure 34
long82c
tJe
longC
longC
p$lse shape
filter %'C(
Primary
ync Code
econdary
ync Code
3G
n
G
P
G
SG
s$
m
38dc
ndc 8
PC
SC
dedicated
traffic channels
primary &
secondary
common pilot
channels
primary &secondary
common
control
channels
other channels
s9p
s9p
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amirin king 33
"ransmit Di&ersity Strategy for Do#nlink
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amirin king 32
cdma2000 Uplink Frame Structure
C'Cencodertail bits
Con;ol$tionalor T$rbo Coder
symbolrepetition
symbolp$nct$re
blockinterlea;er
mod$lationsymbol
C
channelbits
Bits9
Frame
"8
#!
")
*5!
##
"5")
*!#
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