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UMTS Radio Theory
ZTE University
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Content
The Basic Principles of Wireless Communication3G servicesMultiple Access Technolo ies
Spectrum PlanninSpreadin Technolo yCodin And !nterleave Technolo yModulation
UMTS Radio mechanism
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Radio Transmission Technolo yRe"uirements
#ata$%% &'ps (i h speed and drivin)*% &'ps Modest speed and +al&in, M'ps -o+ speed and indoor
.oice%/012'3s 44 $,/,2'3s5%&'3s 6.ideo Phone7
!nformation transmission at varia'le rateaccordin to 'and+idth re"uirements#elay re"uirements of different service
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)8 services
Delay
Bit Error Different QOS requirements
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)8 servicesCategories Actual Service Delay (One-way) Bearer Speed
conversational
Voice
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Content
The Basic Principles of Wireless Communication)8 servicesMultiple Access TechnologiesSpectrum PlanninSpreadin Technolo yCodin And !nterleave Technolo yModulation
UMTS Radio mechanism
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#uple9 mode
T## mode uplin& anddo+nlin& has the samefre"uency
Adapta'le to any fre"uency
'andSuita'le for 'oth asymmetricand symmetric services
:## mode uplin& and
do+nlin& has the differentfre"uencyPaired fre"uency 'ands areneeded
Suita'le for symmetricservices
T## 6 Time divisionduple9;Such as T#4SC#MA7
# # # # U U UU
:## :re"uency divisionduple9; Such as WC#MAand C#MA,
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Why Multiple Access?!ncreased capacity= serve more usersReduced capital re"uirements sincefe+er media can carry the traffic#ecreased per4user e9pense
Types of Transmission Medium:T+isted pair Coa9ial ca'le:i'er optic ca'le
Air interface 6radio si nals7
Three methods are frequently used::#MAT#MAC#MA
Each pair of users en>oysa dedicated; private circuitthrou h the transmissionmedium; una+are that theother users e9ist/
Transmission
edium
ulti le access tec7nolo ies enable 8arious users access ubliccommunication line but 4it7out interference.
Multiple Access Technolo ies
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Users are usingUsers are usingdifferent frequencydifferent frequencyTime
Frequency
F MA
:#MA 6:re"uency #ivision Multiple Access7
:#MATraffic channels are assi ned to different users atdifferent fre"uency 'and; such as TACS; AMPS/
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Time
Frequency
T MA
Users are usingUsers are usingdifferent time slotdifferent time slot
T#MA 6Time #ivision Multiple Access7
T#MATraffic channels are assi ned to different users atdifferent time; such as 8SM; #AMPS/
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Time
Frequency
! MA
!ode
Users are using differentUsers are using differentorthogonal code sequenceorthogonal code sequence
C#MA 6Code #ivision Multiple Access7
C#MATraffic channels are assi ned to users at same time;same fre"uency 'and; 'ut +ith different code/
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Freq" #
Freq" #
! o d e A
! o d e
$
! o d
e !
$%#
$%&
!ode
! o d e '
C#MA Application
Users are distin uished 'y scram'lin codes and ?.S:codesSelf4interference systemC#MA system is restricted to interference 68SM system is
restricted to fre"uency resources7
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Content
The Basic Principles of Wireless Communication)8 servicesMultiple Access Technolo ies%pectrum (lanningSpreadin Technolo yCodin And !nterleave Technolo yModulation
UMTS Radio mechanism
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G S M 9 0 0 / 1 8 0 0 : 3 G ( W C D M A ) :
Sin le :re"uency @et+or&
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!MT4,
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)8 Spectrum Allocation in China
#0 9:'09:
DD 6DD
100 9:15
9:$0
9:
155MHz
1 ;5 1;501 55 1;;0 1)20 1);0 2010 2025 2110 21 0 2200 2$00
Satellite Em ty Satellite
2'00
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)8 Spectrum Plannin in China
Main ?peratin :re"uency Band:## mode $ ,
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Content
The Basic Principles of Wireless Communication)8 servicesMultiple Access Technolo iesSpectrum Plannin%preading TechnologyCodin And !nterleave Technolo yModulation
UMTS Radio mechanism
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Spread Spectrum Principles
1 M($, 2(
!ower is "Spread# Over a $arger Bandwidt%M AT 0 0 AM M ' .
MAT00AMM'.
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radio channel
Receiver Transmitter
SpreadingDespreading
Noise
Spread Spectrum Principles
User information 'its are spread over a +ide
'and+idth 'y multiplyin hi h speed spreadcode6chip7Spread si nal 'and+idth W +ider than ori inalsi nal 'and+idth R'
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f
S f
f0Before spreading
signal
S f
f f0After spreading
signal
S f
f f0After despreading
signalWhite noise
f
S f
f0
Before despreading
signalWhite noise
signal interference White noise
Spread Spectrum Principles
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Spreadin Mode
#irect se"uence spread spectrum #S4SSBase 'and data is spread 'y multiplication of pseudo4noisese"uence and 'ase4'and pulse; the pseudo4noise se"uenceenerated 'y the pseudo4noise enerator BER su'>ect to Multiple Access !nterference and near4far
effectPo+er control can overcome the near4far effect; 'ut it islimited 'y po+er detection accuracyWC#MA uses #S4SS
:re"uency hoppin spread spectrum :(4SS#ata is transmitted in the random channel 'y the carrierfre"uency hoppinBefore :( a ain; data is transmitted usin traditionalnarro+'and modulation@o near4far effect
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Spread Spectrum Principles
any code c%annels are individuallyspread and t%en added toget%er tocreate a "composite signal#
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Un5anted (o5er from6ther .esoures
Spread Spectrum Principles
Any Code Channel can 'e e9tracted from the receivedcomposite si nal 'y usin the ri htD ortho onal codeEner y for transmittin si nal can 'e lo+er thaninterference and noise
(rocessing Gain
$road7and
-nterference
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Concept of ortho onal code
?rtho onal
the result of multiplyinand sum is ud e
?utput after despreadin
inte ral
0
Ts192dt
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Content
The Basic Principles of Wireless CommunicationUMTS Radio mechanism
UMTS #ata transmission ProcedureChannel Codin of UMTSSpreadin Technolo y of UMTSModulation of UMT%
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Modulation Methods in UMTS
BPS2 6Binary Phase Shift 2eyin 7 in Uplin& channlesOPS2 6Ouadrature Phase Shift 2eyin 7 in #o+nlin& channels$5OAM 6$54state Ouadrature Amplitude Modulation7 in (S#PA
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Physical Channel Spread4Spectrum
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Physical Channel Spread4SpectrumModulation Process4Uplin&
Separationof realParts
AndI aginar!
parts
Pulse"or ing
Pulse
"or ing
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