01- Owa200002 Wcdma Ran Basic Principle Issue1.0

8/9/2019 01- Owa200002 Wcdma Ran Basic Principle Issue1.0

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OWA200002

WCDMA RAN Basic

Principle

ISSUE1.0


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Chapter 1 CDMA FundamentalCha

pter 1 CDMA Fundamental

Chapter 2 Performance Enhancement MethodsChapter 2 Performance Enhancement Methods

Chapter 3 CDMA FDD ModeChapter 3 CDMA FDD Mode


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Chapter 1 CDMA FundamentalCha

pter 1 CDMA Fundamental

1.1 Mult!ple Access "echnolo#$ and Duple% "echnolo#$1.1 Mul

t!ple Access "echnolo#$ and Duple% "echnolo#$

1.2 CDMA Pr!nc!ple and &A'E "echnolo#$1.2 CDMA Pr!nc!ple and &A'E "echnolo#$


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Multiple Access Technology and Duplex Technology

Multiple access technology

Tie di!ision ultiple access "TDMA#

$re%uency di!ision ultiple access "$DMA#

Code di!ision ultiple access "CDMA#

Duplex technology

Tie di!ision duplex "TDD#

$re%uency di!ision duplex "$DD#


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"raff!c channels( d!fferentusers are ass!#ned un!)ue

code and transm!tted o*er

the same fre)uenc$ +and,

for e%ample, CDMA and

CDMA2000

"raff!c channels( d!fferent fre)uenc$ +ands

are allocated to d!fferent users,for e%ample,

AMPS and "ACS

"raff!cchannels( d!fferent t!me slots

are allocated to d!fferent users, for

e%ample, DAMPS and -SM

Fre)u

enc$

"!me

Poer

Fre)u

enc$

"!me

Poer

Fre)u

enc$

"!me

Poer

FDMA

"DMA

CDMA

User

User

User

User

User

User

Multiple Access Technology


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Characteristics o& CDMA 'yste

(igh 'pectral )&&iciency

$re%uency ultiplex coe&&icient is *+

so&t capacity

,uality

Co!erage

-nter&erence

'el&.inter&erence syste

A /) transission poer is inter&erence &or another /)+


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Chapter 1 CDMA FundamentalChapter 1 CDMA Fundamental

1.1 Mult!ple Access "echnolo#$ and Duple% "echnolo#$1.1 Mult!ple Access "echnolo#$ and Duple% "echnolo#$

1.2 CDMA Pr!nc!ple and &A'E "echnolo#$1.2 CDMA Pr!nc!ple and &A'E "echnolo#$


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correlation

Correlation is a easure o& siilarity o& 1eteen any to ar1itrary signals+

)AMP3)4

-1 1 /1 1

1 1 1 1/1 1 /1 1

ero correlat!on

rtho#onal s!#nals

/1 1 /1 1

/1 1 /1 1

1 1 1 1

1 correlat!on

Ident!cal s!#nals

1

0

/1

10

/1

1

0

/1

1

0

/1


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'preading

Despreading

Chip

'y1ol

Data

'preading code

'preading signal

5Data6code

Data

5'preading6code

*

.*

*

.*

*

.*

*.*

*

.*

'preading code

'preading and Despreading


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'pectru Analysis o& 'preading 7 Despreading

Spread!n# code

Spread!n# code

S!#nal

Com+!nat!on

arro+and s!#nal

f

P4f5

6road+and s!#nal

P4f5

f

o!se

P4f5

f

o!se6road+and s!#nal

P4f5

f

&eco*ered s!#nal

P4f5

f


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Source

cod!n#Channelcod!n#

Spread!n# Modulat!on

Source

decod!n#Channel

decod!n#Despread!n# Demodulat!on

&ad!o channel&ad!o channel

Processing Procedure o& CDMA 'yste


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Multi.path )n!ironent

"!me

&ece!*ed

s!#nal

"ransm!tted

s!#nal


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Principle o& RA8) Recei!er

&ece!*e set

Correlator 1

Correlator 2

Correlator 3

Searcher

correlator

Calculate the

t!me dela$ and

s!#nal stren#th

Com+!ner"he

com+!ned

s!#nal

tt

s4t5 s4t5

&A'E rece!*er help to o*ercome on the mult!/path fad!n# and enhance the rece!*e

performance of the s$stem


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'tructure o& RA8) Recei!er

7 8

7 I

Com+!ner

I

Matched

F!lter

Phase

&otator

Channel

est!mator

Dela$

E)ual!9er

I

8

Path 1

Path 2

Path 3

Input s!#nal

Correlator

Code

#enerators 8


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Ad!antages o& CDMA

RA8) recei!er is adopted The tie di!ersity e&&ect generated 1y channel

coherence tie is e&&iciently used+

&re%uency di!ersity

Wide1and &re%uency spectru

(igher inter&erence tolerance and security per&orance 3o signal transission poer

9reat &lexi1ility in carrying ultiple ser!ices ith largelydi&&erent 1it rate and ,o' re%uireent+

Di&&erent spreading &actors &or di&&erent ser!ices ith

di&&erent data rates (igh spectral e&&iciency

All users can share the sae &re%uency spectrusiultaneously+

'upporting so&t hando!er and so&ter hando!er+


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('DPA 8ey Techni%ues . O!er!ie

AMC Fast Schedul!n#:A&8 :$+r!d A&8

1;8AMSF1;, 2ms and CDM


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AMC 4Adapt!*e Modulat!on = Cod!n#5 +ased on Channel 8ual!t$ Feed+ac>

Ad:ust data rate to copensate channel conditions

; 9ood channel condition < (igher rate

; Bad channel condition < 3oer rate

Ad:ust the coding rate to copensate channel conditions

; 9ood channel condition ?

; Bad channel condition =

Ad:ust the odulation schee to copensate channel conditions

; 9ood channel condition


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('DPA 8ey Techni%ues . $ast scheduling

Scheduler ma$ +e +ased on

CDM TDM Channel condition

Aount o& data aiting in the %ueue "delay#

$airness "satis&ied users#

Cell throughput etc

Scheduler ma$ +e +ased on

CDM TDM Channel condition

Aount o& data aiting in the %ueue "delay#

$airness "satis&ied users#

Cell throughput etc

'cheduling

deterines

hich user

shall 1e

transitted+

'cheduling

deterines

hich user

shall 1e

transitted+


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('DPA 8ey Techni%ues < CDM and TDM

Channel!9at!on codes allocated

for :S/DSC: transm!ss!on

? codes 4e%ample5SF@1;

SF@?

SF@

SF@2

SF@1

User B1 User B2 User B3 User B

""I

Shared

channel!9at!on

codes

10 ms

20 ms

0 ms

?0 ms

Earlier releases

2 ms

Rel 5 (HS-DSCH)

Esu1.&raesF "2G@0 chips#


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-ntroduction to Di!ersity Techni%ue

Di!ersity techni%ue is used to o1tain

uncorrelated signals &or co1ining

Reduce the e&&ects o& &ading

&ast &ading caused 1y ulti.path

'lo &ading caused 1y shadoing

-pro!e the relia1ility o& counication

-ncrease the co!erage and capacity

Macroscopic di!ersity

'o&t hando!er and so&ter hando!er

Reduce large.scale &ading

Microscopic di!ersity


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Microscopic Di!ersity

Tie di!ersity

Channel coding Bloc interlea!ing error.

correction

$re%uency di!ersity

The user signal is distri1uted on the

hole 1andidth &re%uency spectru

'pace di!ersity

Recei!e di!ersity

Transit di!ersity

Polariation di!ersity

Hertical polariation

(oriontal polariation


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Characteristics o& WCDMA $DD

Channel 1andidth4 GM(

Chip rate4 =+I?Mcps

$rae length4 *0s

Hoice coding4 AMR "Adapti!e Multi.Rate#

Coherence deodulation aided ith pilot

$ast closed loop poer control4 *G00(

(ando!er4 so&t>hard hando!er


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01- Owa200002 Wcdma Ran Basic Principle Issue1.0

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