1 UMTS Radio Theory-63.ppt

8/12/2019 1 UMTS Radio Theory-63.ppt

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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



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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



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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



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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


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



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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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any code c%annels are individuallyspread and t%en added toget%er tocreate a "composite signal#


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Un5anted (o5er from6ther .esoures


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

$os2#t3

0sin2#t3

S dp$%*n

4e2S3

I 2S3

" d< d

I

$ $

-

+

I,+-

&P&)1( ) d*6 7 d

&P&)1 6) d*8 7 d

&P&)1 8

) d*/ 7 d&P&)1 /

) d*9 7 d&P&)1 9

) d*: 7 d&P&)1 :

$$) $ 7 $

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1 UMTS Radio Theory-63.ppt

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