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Ni dung

Chng 1: Tngquanh tiuchun IEEE802.16 v WIMAX Forum

Chng 2:Knh vtuyn ding

Chng 3:Xl tnhiuOFDM

Chng 4: Giao din v tuyn cho cc h thng khng dy bng

rngcnhca WiMAX

Chng 5:Lp MACca WIMAX ding

Chng 6:M hnhlpvtl v cc tnhnngtintinca WIMAX di

ng

Chng 7: MphngWIMAX

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Tng quan h tiu chun IEEE 802.16e vWIMAX Forum

1

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T ng quan h tiu chu n IEEE 802.16v WIMAX Forum

Cu hnh topo ca WMAN

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Tng quan h tiu chun IEEE 802.16v WIMAX Forum

So snh cc chun IEEE 802.16, 16a, 16e

802.16 802.16a 802.16e

Ngy hon thnh 8/2002 4/2003 2006Bng tn 10-66GHz 2-11GHz 2-6GHz

iu kin knh LOS NLOS NLOS

iu chQPSK, 16QAM,

64QAM

OFDM 256 sng mang,

BPSK, QPSK, 16QAM,

64QAM

OFDMA kh nh c,BPSK, QPSK, 16-QAM,

64QAM

Tnh di ng C nh C nh Di ri, sch tay, di ng

Bng thng knh 20, 25, 28MHz Kh nh c t 1,75 n 20MHz

Kh nh c: 1,25; 5; 10;20 MHz

Bn knh inhnh 2-5 km 7-40 km 2-5 km

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Cc loi ng dng cho h thng da trn 802.16e

Loi ng dng Bng thng Tr Jiiter

1Tr chi tng tc

a lpThp 50 kbps Thp

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802.16-2004

Cc ng dng c nhn sng mang trc x10-66MHz; OFDM bngcp php 2-11MHzkhng trc x,bngcp php v min php

Cc h sWiMAX

Kim tra cpchng nhn

OFDM

3,5 GHz

5,8 GHz

Cc h sWiMAX

Kim tra cpchng nhn

2,3 GHz2,5 GHz

3,5 GHz

Trin khai cc dch v di ng theochun WiMAX di ng/802.16e

Cc h spht hnh 1

Cc h s WiMAX di dng khc:Bng tn, bng thng knh, FDD....(ty theo th trngv c hi)

802.16eCc ng dng di ng

v c nh; SOFDMA

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Knh v tuyn v c tnh knh

2

Truyn sng LOS v NLOS

Truyn sng trc x LOS

Truyn sng khng trc x NLOS

M hnh knh v tuyn di ng a ng

M hnh elip ca Parson v Bajwa M hnh ha knh v tuyn di ng bng cc ng tr r nhnh

c tnh knh cho WiMAX

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Khong cch pht thu

Cngsutthu(dBm)

Che chn + Suy hao

Suy hao

Pha inh xung quanhChe chn + Suy hao

Knh v tuyn

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Truyn sng LOS v NLOS

Cc iukintruyn sng WiMAX: Knh truyn sng trcx LOS (Line of Sight) Knh truyn sng khng trc x NLOS (None Line of

Sight).

WiMAX m bo ph sng tt nht cho c haitrnghp: Mi trngtruyn sng LOS: ln n 50 km Mi trngtruyn sng NLOS: ln n 8 km

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Cc vt chn nm ngoi

vng gii hn bi 0,6khong h vng Fresnelth nht

Trm gcWiMAX

Trm thubao WiMAX

Khong h vngFresnel th nht

Truyn sng trc x LOS

Khong h cn thit ph thuc vo: (1)tn s cng tc; (2) c ly my pht/thu

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Trm gcWiMAX

Trmthu bao

WiMAX

ng trc tip

ng gin tip

Truyn sng khng trc x NLOS

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M hnh elip ca Parsons v Bajwa

0 , 0,1,.....,L 1

x x

x xgc t i khc nhau

Tn s Doppler kh c nhau

T RCc - ng truyn c ng di c ng

T R

C

A

x x

x x

gc t i bg nhau

Tn s Doppler bng nhau

T RCc - ng truyn di Tr

T R

A

B

B

A

RxTx

C

0

1

2

3

Hng chuyn ng

Thnh phn LOS

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-

y(t) = x(t - ).h(t, ).d = x(t) h(t, )

0

x(t)

0 1L 2

L 1

y(t)

0 0 1L 2 (L 2) L 1

(L 1)

1 L 2 L 1

M hnh ha knh v tuyn di ng

Mhn

hng

tranh

nh

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( , ) ( )

, ( ) ( )

( , )

, .

( , ) . . ( )

, ( ) .

c

c

Li t

L

j f t

i j f

h t

h t

t e e t

e et t t

t t

1

0

1

0

2

2

t0

t1

t2

t3

t4

t

( )t 0

( )t 1

( )t

2

( )t 3

( )t 4

( )t0 0( )t1 0 ( )t2 0

( )t0 1( )t1 1 ( )t2 1 ( )t3 1 )(L t 1 1

)(L t 1 0)(t3 0

( )t0 2( )t1 2

( )t

2 2 ( )t

3 2 ( )Lt

1 2

( )t0 3( )t1 3

( )t2 3 ( )t3 3 ( )L t 1 3

( )t0 4 ( )t1 4 ( )t 42 ( )t3 4 ( )L t 1 4

0 1 2 3 L 10(t )

1(t )

2(t )

3(t )

4(t )

p ng xung kim ph thuc thi gian

2 2

1 2t, a t, (t) t, (t)

t, :

t, : c

(t) :

Bin

pha a - ng truyn th

tr

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c tnh knh v tuyn di ng

m

Kh

Ph

C

C

ax

C

d

C

i nim t- ng quan; nht qun

n t n trong min thi gian ,

hn lc trong min tn s (B )

Phn tn trong min tn s f ,hn lc trong min thi gian (T )

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Tnh ph thuc thi gian

1t 1t

( , )h tt

1( , )h tt

2t 2t

( , )h tt

2( , )h tt

uvo

u

vo

b)p ng xung kim ca h thngthay itheo thi gian

t

1t 1t

( )h t ( )h t

2t 2t

uvo

u

vo

t

a)p ng xung kim ca h thngkhng thay i theo thi gian

1 2( , ) ( , )( )

h t h t h

t t

t

1 2( , ) ( , )h t h t t t

Dnghmkhng

thay i

Dnghm

thay i

PSD

u vo

PSD

u ra

2

0( ) ( )xxS f A f f d

2

0( ) . ( )yy hhS f A S f f

f

0f

0f

f

0

0

B

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Tnh ph thuc tn s

Tr rt nh

Tr rt ln

Knh

Tnhiuvox(t)

Tnhiuray(t)

Hm truyn t

ca knhX(f)

X(f)

Hm truyn tca knh

Y(f)

Hm truyn t knh phng trongbng tn tn hiu (knh phainhphng)

Hm truyn t knhkhngphngtrong bng tn tn hiu

(knh phainh chn lc tn s)Y(f)

ki k h l b h h h

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Trung bnh ha

( , )h t

1( )t

2( )t

L lchtr ang

3( )t

1

2 3 4 5

1 2 3 4 5t1

t1

t1

t

p ng xung kim knh v ly trung bnh cc thnhphn tn x

Cc ng truyn kh phn gii

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Cc loi phainh phm vi hpC s phn loi Loi Phainh iu kin

TritrangPhainhphng B

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L lch tr cng sut a ng ca ITU cho 3G

-16,0-25,2-10,0-12,80-2,5

20000171001290089003000(ns)i xe B

(L=6)

-20,0-15,0-10,0-9,0-1,00

2510173010907103100(ns)i xe A

(L=6)

-23,9-7,8-8,0-4,9-0,90

3700230012008002000(ns)

i b B

(L=6)

-22,8-19,2-9,70

NANA4101901100(ns)i b A

(L=4)

543210

2

la (dB)

2

la (dB)

2

la (dB)

2

la (dB)

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:H - c tnh ca hm truyn t knh

c tnh knh cho WiMAX

Nu k hiu Xl tn hiu pht, Hl hm truyn tknh, Wl tp m trng ca knh, Yl tn hiu thu,th

Y = H * X + W

Y - W YX = =

H H

S

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LS

YH =

X

Phng php bnh phng trung bnh nh nht LS(Least Mean Square Estimation)

:

:

:LS

X

Y

H

vect t n hiu pht

vect tn hiu thu

- c tnh hm truyn t ca knh theo phng ph p LS

Cc vectX v Y u c chiu di bngshoa tiu trongcc k hiu OFDM v vic tnh ton c thc hin trntngkhiu OFDM

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Phng php bnh phng trung bnh cc tiu tuyn tnh(LMMSE- Linear Minimum Mean Square Estimation)

1

1 .

H = R R X X H2wH

LMMSE hh hh LS

.:

R E H H

2w Ph- ng sai ca AWGN

Chs trn H l chuyn vHermitain ca ma trn

H

hh LS LS

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CSI b tr

Internet

t=0: MS c tnh knh & a tr li BSt=: BS nhn cc c tnh, thch ng

truyn dn da vo cc c tnh nyt=0t=

CSI khng chnh xc BER ln hnb/s/Hz nh hn

MS

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D on knh v tuyn

Dng cc c tnh knh hin ti v trc d onp ng knh tng lai

Khc phc tr a tr li: Thch ng da vo p ng

knh c d on

h(n-p)

h(n-)

h(n)h(n+) ?

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D bo thng qua c tnh tn s 2-D

Nuc tnh chnh xc cc tham sknh trong m hnh knh,

th c thngoisuy mtcch hiuqu qu trnh pha inh

Khongthigian c tnh v ngoisuy nn nm trong cas

thigian trong cc tham sm hnh l dng

c tnh cc hnh sinphc hai chiu trong tp m

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i i i i

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nh v hoa tiu trong min thi gian v tn s

C s da vo vo c tnh knh (tn s Doppler cc i v

tri tr a ng cc i) iu kin m bo nh l ly mu trong min thi gian

v tn s

m C

i m C

f i

m i

Kho (B )ho f

m

B )

f

(

1 1N fKho Nf

ax

ax

ax

ng cch tn s

ax

c

ng c ch tn s:

d

d

t

Kho

t

d

f

Kho N1 1

2fN T 2 fT

ng cch thi gian

ng cch thi gian:

Cf=48

Nf 4

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Minh

ha cu

trc

khung

hoa tiu

Nf=4

Nt=3

t

Khun

gN-1

Kh

ungN

f

Nt=3

K hiu s liu

K hiu hoa tiu

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X l tn hiu s trong OFDM

3

Tngquan iuchOFDM

ngbtns

c tnh knh

B trcn bngI/Q

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Sng mang con

Tn s

ln

Knh

Bandwidth

Ph bng tn gc OFDM

Tng quan OFDM

Tr rt nh

Tr rt ln

Knh

Tnhiuvox(t)

Tnhiuray(t)

Hm truyn tca knh

X(f)

X(f)

Hm truyn tca knh

Y(f)

Hm truyn t knh phng trongbng tn tn hiu (knh phainhphng)

Hm truyn t knh khngphng trong bng tn tn hiu(knh phainh chn lc tn s)

Y(f)

T OFDM

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M hnh bng gc ca h thng pht thu OFDM

Binin

itip

thnhsongsong

IFFT

Binisongson

g

thnhn

itip

Chn CPTodng

D/A

Knh

A/Dnhthi

Kh CP

Bininitip

thnhsong

song

FFT

Giiiuch

thng

thng

iuchthng

thng

Tng quan OFDM

T OFDM

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Bng thng tn hiu: 1/Ts

Tn s

(cc sng mang con)

Khong cch sngmang con = 1

FFTT

TsL im CP Ca s quan trc N im

Thi gian(cc mu)

T (Thi gian k hiu OFDM) = TFFT+TCP

OFDM trong min thi gian-tn s

Tng quan OFDM

T OFDM

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FFTN-1

i,k CP FFTk

i=0

ij2 (t-kT)T

T0,k 1,k N-1,k p k

e kT - T t kT + T(t - kT) =

0,

Xx

x x ....x ; p N

nu khc

kX = w X

,

Tn hiu u ra b IFFT

Wp l ma trn con NxP ca ma trnlymuminthi gian W

N l simlymuP l s sng mang con ciuchbisliu.Mi khiu OFDMc pht trn ton bgiitncp pht

Tng quan OFDM

T OFDM

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0, 1, 1, k

1

p

....

H 0

0 H

k k p k y y y

T

k p

p k

y w Hx

w x

i

i

i

x

y

H

l DFT ln sng mang con i u vo

l DFT ln u ra

l DFT ln p ng knh

1

( ). . ;

i

h e d

i

FFT

j2 f

i i

Ta tnh

T

H =H j2 f

f

; i = 0,1,2,...,N-1i i iy = x H

u ra knh v tuyn

Sau gii iu ch OFDM

u ra knh v tuyn v sau gii iu ch OFDM

Tng quan OFDM

g T OFDM

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C

hntint,

hut;hoatiuvsngmangrng

CP Khi FFT PP

K hiu FFT k K hiu FFT k+1K hiu FFT k-1

CP: Cyclic Prefix: tin t chu trnhPP: Cyclic Postfix: hu t chu trnh

Sng mang con hoa tiuSng mang con s liu

fSng mang con rng Sng mang con rngSng mang con s liu v hoa tiu

Chn hoa tiu & sng mang rng

Chn tin t v hu t chu trnh

Tng quan OFDM

ng b tn s

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FFT

k

1j2i +f tN-1

j2 k. f .TT

i,ki=0

f : d

(t)x X e e

=

FFTFFT CP s

ch tn sng mang con

TT=T +T =(L+N)T =(L+N)N

Tn hiu OFDM b dch tn s

ng b tn s

ng b tn s

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FFT FFT

FFT

FFT FFT

FFT

T1 TN-1 j2i +f m j2k(N+L)T N N

k i,k

i=0

m.f.Tm TN-1 j2i + j2k(L+N).f.N N N

i,k

i=0mN-1 j2i

ji jk(L+N)Ni,k

i=0

f.T2

= X e e

= X e e ; m=0,1,...,N+L-1

= X e e e

N

x

Ly mu ti tc gp N ln fi

Chn nh k chui hoa tiu p(1), p(2),..., p(N), khi thu c dch tnsng mang s l

( 1)

(1), (2) ,..., ( )

j j N

P P e P N e

ng b tn s

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Giao din v tuyn cho cc h thng khng dybng rng c nh ca WiMAX

4

M hnh tham kho

Tng quan cc tnh nnglp MAC v PHY

Cc ty chn

WirelessMAN OFDM

WirelessMAN OFDMA

Phm vi ca tiu chun

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Lp vt l(PHY)

Lp con an ninh

Lp con phn chung ca MACMAC CPS

Lp con hi t c th dch v(CS)

CS SAP

MAC SAP

PHY SAP

Thc th qun lCc lp con hi t

c th dch v

Thc th qun l

Lp con phn chung ca MAC

Thc th qun lPHY

Lp con an ninh

MAC

PHY

Hth

ngqunlmng

Phm vi ca tiu chun

Mt phng s liu/iu khinMt phng qun l

K hiu:SAP: Service Access Point: im truy nhp dch vMAC: Medium Access Control: iu khin truy nhp mi trngCS: Convergence Sublayer: lp con hi tCPS: Common Part Sublayer: lp con phn chung

PHY: Physical: lp vt l

Mhnh

thamkhongnxpgiao

thcca

802.16

TNH NNG LP VT L

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TNH NNG LP VT L

ngxung

ngln

Khung

Thi gian

Qung b

SS song cng

SS bn song cng 1

SS bn song cng 2

n nh bng thng FDD theo cm

GhpsongcngFDD

SS song cng Tx/Rx ng thi trn 2 tn s khc nhau;

SS bn song cng, thu pht khng ng thi, dn n TRG; RTG (ng b)

TNH NNG LP VT L

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Khung j-2 Khung j-1 Khung j Khung j+1 Khung j+2

n=(Tc x thi gian khung)/4

Thch ng

Khung con ng ln Khung con ng xung

PS0PSn-1

i vi SC, SCa, tc l tc k hiu;i vi OFDM v OFDMA tc l tn s ly mu danh nh (fs)GhpsongcngTDD

Cu trc khung TDD

TNH NNG LP VT L

CC TY CHN

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CC TY CHN

H thng anten thch ng AASVng AAS, FDD

Vng AAS, TDD

M ha khng gian thi gian STC

Pht li t ng ARQ

Cu hnh li Mesh

CC TY CHN

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HthngAAS

Ti

ntng

xung

thngthng

FCH

Cm1

Cm2

TintAAS

Vng

AASng

xung

Cc cm ng

xung thng thng

Vngngl

n

AAS

Cc cm ng lnthng thng

FCH: Frame Control Header

Vng AAS, FDD

CC TY CHN

CC TY CHN

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Tintng

xu

ngthngth

ng

FCH

Cm1

Cm2

TintAAS

VngAASn

g

xu

ng

Cc cmng xungthng thng

VngnglnA

AS

Cc cm ng lnthng thng

HthngAAS

Vng AAS,TDD

CC TY CHN

CC TY CHN

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M ha

phn

tp pht

IFFT

IFFT

Lc DAC RF

Lc DAC RF

RF ADC Lc FFT

B kt

hpphn tp

B gii

iu chknh con

Ly Log

t l khging

B

giim

BS

SS

iu chknh con

ng giu vo

IFFT

Nguyn l STC

CC TY CHN

TNG KT CC C T GIAO DIN V TUYN TRONG CHUN 802.16e-2005

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Cc c t giao din v tuynTn c t ng dng Yu cu lp

MAC b sungCc ty chn K thut ghp

song cng

Wireless MAN-SC 10-66GHz TDDFDD

WirelessMAN-SCa Cc bng tn cp php

di 11 MHz

AAS**; ARQ***;

STC****

TDD

FDD

WirelessMAN-OFDM

Cc bng tn cp phpdi 11 MHz

AAS; ARQ; Cuhnh li; STC

TDD

FDD

WirelessMAN-OFDMA

Cc bng tn cp phpdi 11 MHz

AAS; HARQ; STC TDD

FDD

WirelessHUMAN* Cc bng tn minphp di 11 MHz

DFS AAS; ARQ; Cuhnh li; STC

TDD

* HUMAN: High Speed Unlicensed Metropolitan Network: Mngthmin php tc cao** AAS: Adaptive Antenna System: Hthng anten thch ng***ARQ: Automatic Repeat Request: Yu cu pht litng

****STC: Space Time Coding: M khng gian thi gian

cho truy nhp c nh

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WirelessMAN OFDM

WirelessMAN OFDM

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Cc tnh nng ca WirelessMAN OFDM

Tnh nng Li ch

Dng sng 256 im FFT OFDM Htrmi trng LOS v NLOS ngoi tri

iu ch v thay i m sa lithch ng theo tng cm sng v

tuyn

mbo ng truyn v tuynbn vngnhngvn duy tr tc bit cci cho tngthu bao

HtrTDD v FDD png cc iul khc nhau cc vng khcnhau trn thgii

Kch thc knh linh hot

(3,5MHz; 5MHz; 10 MHz ...)

Cung cp nhu cu khai thc linh hot trong cc

bng tn khc nhau ph thuc vo yu cuknh khc nhau trn thgii

Thitkh trcc h thng an

ten thch ng(to bp) v STC

Cc h thng ny ngy cng khdng v githnh ngy cng r. Chng cho php gimnhiu, tng lih thng v s trnn quan

trng khi trin khai BWA.

WirelessMAN OFDM

Tngquan

tnhnngW

irelessMAN

OFDM

WirelessMAN OFDM

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Trm gc

SS3

SS1

SS2

SS4

iu ch thch ng trong lp vt l

WirelessMAN OFDM

WirelessMAN OFDM

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Cutrckhu

ngOFDM

ngxung

WirelessMAN OFDM

Cutrc

khung

Khung n-1- Khung n Khung n+1 Khung n+2

DL PHY PDU

Tin t FHC Cm DL#1 Cm DL#m

DLFP

MAC PDU 1 MAC PDU n m

Cc bn tinqung b

Cc MAC PDUthng thng

Cm DL#2

Mt k hiu OFDM sdng BPSK t l 1/2

Cha mt hay nhiu cm DL vi iu ch v m hakhc nhau c pht theo th t gim dn bn chc

Thi gian

DL: Downlink: ng xungMAC: Medium Access Control: iu khin truy nhp mi trngPDU: Protocol Data Unit: n v s liu giao thcDL-MAP: Sp xp ng xungUL-MAP: Sp xp ng lnDCD: Downlink Channel Descriptor: M t knh ng xungUCD: Uplink Channel Descritor: M t knh ng ln

DLFP: Downlink Frame Prefix: Tin t ng xung

Cha: DL-MAPUL-MAP, DCD,

UDC

Khung con ng xung

Tiu MAC

(6 byte)

Ti tin MAC

(ty chn)

CRC (ty

chn)

WirelessMAN OFDM

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Cu trc khung OFDM ng ln

WirelessMAN OFDM

Khung n-1- Khung n Khung n+1 Khung n+2

Thi gian

UL: Uplink: ng lnMAC: Medium Access Control: iu khin truy nhp mi trngPDU: Protocol Data Unit: n v s liu giao thc

Khung con ng ln

Khe va chm

nh c ly lnu

Khe va chm yu cu

bng thng

PDU lp vt l t SS#1 PDU lp vt l t SS#n

Tin t Cm UL

MAC PDU#1 MAC PDU#n m

Mt cm UL cho mt PDU lp vtl c truyn theo iu ch v

m ha ring cho tng SS

Tiu MAC(6 byte)

Ti tin MAC(ty chn)

CRC (tychn)

Cc thng s chnh WirelessMAN OFDM

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Thng s Gi tr

Bng thng 3,5MHz

Tltnslymu trnbng thng (fs/B)ivibng thng lbis 1,75 GHz: n=8/7, ivibng thng

lbis 1,5 GHz: n=86/75, ivibng thng lbis 1,25 GHz:n=144/125, ivibng thng lbis 2,75GHz: n=316/275, ivibng thng lbis 2GHz: n=57/50; ivibng thng khngcct khc: n=8/7

Sim FFT 256

S sng mang con tch cc 200

S sng mang conbov (tri) 28

S sng mang conbov(phi) 27

Chsdchtnca cc sng mang conbov

-129, -128,...,-101

+101, +102,..., +127

Khong cch tns sng mang con (KHz) 15,625

Thi gian k hiuhu ch, TFFT (s) 64

Khongthi gianbov (12%), TGP (s) 8

Thi gian k hiu OFDM, T (s) 72

T l di tin t chu trnh trn di

hiudngca k hiu OFDM (TG/TFFT)

1/4, 1/8, 1/16, 1/32

Cutrc

lpvtlW

irelessMAN

OFDM

WirelessMAN OFDM

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Ngunhin ha

M ha

knhiu ch

Lp rpkhung

256

IFFT

Chn

CPP/S

Knh

ng bS/PLoi CP256 FFTc tnh knh

Cn bng

min tn s

Tho g

khunng

Gii iu chGii m

knh

Gii ngu

nhin

Bng gc pht

Bng gc thu

S khi bng gc ca my pht v my thu WirelessMAN OFDM

WirelessMAN OFDM

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WirelessMAN OFDMA

WirelessMAN OFDMA

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WirelessMAN OFDMA

Knh con 1 Knh con 2 Knh con 3Knh DC

Bng bo v triBng bo v phi

S th t k hiuSthtk

nhcon

Minh ha vng s liu trong n nh OFDM

OFDM trong min tn s(ba knh)

KheOFDMA

TGDTFFT

T

OFDM trong min thi gian

n nh cc sng mang con OFDMA

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n nh cc sng mang con OFDMA

Tnslymu: fs = nB.DL-FUSC (Spxp knh con s dng ton b ngxung): sng

mang con hoa tiu cnnhtrc, sng mang con cn lic dnh

cho sliu v c chia thnh cc knh con. UL-PUSC & DL-PUSC: Chia tp sng mang con kh dng thnh

cc knh con, sau nnh sng mang con hoa tiu trong tngknh

con.

Nhvy, FUSCchc mttp sng mang con hoa tiu, cn

PUSC th miknh con c cc sng mang con hoa tiu cho

ring mnh.

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WirelessMAN OFDMA

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Th d spxp kheOFDMA

vo: (1)

knh con;

(2) k hiutrn ngln

Spx

psliuOFDMA

(ngln)

WirelessMAN OFDMA

K-2 K-1 K K+1 K+2 K+3 K+4 K+5 K+6 K+7 K+8 K+9 K+10 K+11 K+120123456789

10

1112131415

L

Vng s liu

S th t knh con

Ch s k hiu OFDMA

Khe n

Khe n+10

Vng ng ln

Khe n+11 Khe n+22

WirelessMAN OFDMA

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C

utrckhu

ngPMP(1)

k

Cm DL #3

Cm DL#1

Tin

t

FCH

DL-MAP

UL-MAP

Cm DL #2

Cm DL #4

Cm DL #5

Cm UL #1

Cm UL #2

Cm UL #3

Cm UL #4

Cm DL #5

Tin

t

DL-MAP

FCH

k+1 k+3 k+5 k+7 k+9 k+11 k+13 k+15 k+17 k+20 k+23 k+26 k+30 k+31 k+33

Khung con DL TTG Khung conUL RTG

S

tht

l

ogic

knh

con

ss+1s+2

s+L Knh con Ranging

t

Minh ha cu trc khung theo thi gian TDD (vng bt buc)

WirelessMAN OFDMA

WirelessMAN OFDMA

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C

utrckhu

ngPMP(2)

Khung OFDM c nhiu vng

WirelessMAN OFDMA

TInt

PUSC

(vngu

tinch

aFCH

v

DL-

MAP)

PU

SC

(DL-Perm

Base

lX)

FU

SC

(DL-Per

mBase

ly

)

FU

SC

(DL-Perm

Base

lZ)

FUSC

tychn

A

MC

PUSC

tychn

A

MC

TU

SC1

Phi xut hin trong mi khung

C th xut hin trong khung

TU

SC2

PU

SC

Khung con ng xung Khung con ng ln

DL-PermBase: Downlink Permutaion

Base: c s hon v ng xung

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Lp MAC ca WIMAX di ng

5

Nhimvcbncalp MAC l qunlhiuquti nguyn v tuyn

Kin trc mng

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Internet

MSS1

MSS2

MSS3

BS

Internet

MSS1

MSS3

BS Ch mng805.16

h hp

Ch PMP trongcc mng805.16

Kin trc mng

CU TRC LP MAC

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ng dng

B phn loigi DL

B lp rp ligi UL

Qun l cuhnh

H thngqun l mng

SSCS

Hng i cho cc lung QoS khc nhau

u my lung dch v

Qun lng truyn

ARQ B lp biu Bo mt

Qun l MACLp biu cmng xung

X l cmng ln

iu khincho phpkt ni

Lp vt l

CPS

PHY

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M hnh lp vt l v cc tnh nng

tin tin ca WIMAX di ng

6

n sng mang

OFDM

OFDMA

Cc ng dng ca WiMAX

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Loi QoS Kiu s liu ng dngDchv cho php khngkhn ni (UGS:Unsolicited Grant

Service)

Cc lung s liu c ccgikch thc c nh thi gianthcc pht nhk

T1/E1; VoIP vitritim lng

Dch v thm d thigian thc (rtPS: RealTime Polling Service)

Cc lung s liu c cc gikch thckhbinthi gianthcc pht nhk

inthaithy hnh,tr chi video tngtc, VoD, AoD

Dchvthm d phi thigian thc (nrtPS: NonReal Time Polling

Service)

Cc lung s liu c cc gikch thc khbin chu tr

ihitcsliucctiu

Chuyn file tc cao, MMS, trnh

duyt WEB

Dchvnlcnht (BE:Best Effort)

Mcdchvthpnht FTP, WWW, thint

g g

Cc tnh nng ni bt ca 802.16e

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Cc tnh nng ni bt ca 802.16e

Cc knh con s liu bn chc cho di ng v ti s dng tn s cao

Phn tp tn s cho mc di ng cao

Phn nhm cc sng mang con kh nhiu gia cc sector v cc

Ti s dng tn s t 1 n 3 trong cu hnh nhiu sector v nhiu

Cc knh con iu ch v m ha tin tin (AMC) khai thc phn tp v a ngi s dng

n nh knh con ng (ni v gia cc )

Hi tip thng tin cht lng knh v gim st knh ng ln

iu ch vi m ha thch ng t c thng lng cao nht

S-OFDMA (OFDMA kh nh c)

Phn cch sng mang con c lp bng thng m bo chng hiu ng Doppler v

phainh a ng

S sng mang con (kch thc FFT) thay i theo bng thng/kch thc FFT n v nh nht cu cp pht bng thng c gi tr c nh

Cc cu trc knh con linh hot v chuyn mch vng gia cc ch phn tp v AMC

M ha knh kt hp yu cu pht li t ng lai ghp (H-ARQ)

MIMO v cc h thng anten tin tin (AAS)

Thng s h thng & chc nng c s

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g g g

Cc cu trc khung baogm cc khung ngln, ngxungv cc

khung ty chn cho dn anten thch ng(AAS)

Spxp cc trngbn tin vo cc khun dngphn tthng tin (IE)

ngln, ngxungv ngcli

nnh sng mang con OFDMA baogmtintngxung, cc cu

trc knh con s liu v hoa tiu, gim st knh v knh con s liu

ngln

Cc tn hiunhcly OFDMA

Khai thc dn anten baogm cc m khng gian thigian 2x, 3x, 4x vcc cchto bp anten

iuchv m ha knh, cchH-ARQ

iukhin cng sut

OFDMA KH NH C

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OFDMA KH NH C

Cc thng s ca S-OFDMAThng s Gi tr

Bng thng (MHz) 1,25 5 10 20

Tnslymu, fs (MHz) 1,4 5,6 11,2 22,4

Sim FFT 128 512 1024 2048

S knh con cho cc

ch khc nhau

DL FUSC 2 8 16 32

DL PUSC 3 15 20 60

UL PUSC 4 17 35 70

Khong cch sng mang con, f10,94 kHz

Thi gian hiudng, TFFT 91,4 s

Thi gian bov, TG 11,4 s

di k hiu T=TG+TFFT 102,9 s

S k hiu OFDMA trong khung 5ms 48

Giao din MAC/PHY

N hi h Gii hi

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CutrclpvtlS-OFDM

A

Ngu nhin ha

FEC

an xen

Sp xp k hiu

Sp xp knh conChn hoa tiu

IFFT

Tin t chu trnh

DUC

CFR

DPD

Gii ngu nhin

Gii m FEC

Gii an xen

Gii sp xp k hiu

nh gi knhCn bng v CFO

Hiu chnh

Gii sp xp knh conLy ra hoa tiu

FFT

Loi b tin t chu trnh

DDC

ng chnhOFDM (Ranging)

X l mcbit

X l mc khiu OFDMA

X l RF s

ng lnng xung

M ha khnggian thi gian

To bpM ha MIMO

Gi m khng gianthi gianTo bp

Gii m MIMO

Tuyn xl s cho

anten phtkhc

DAC

PA

ADC

LNA

n anten pht Anten thu

LNA

T anten thu khc

n tuyn x l scho anten thu

khc

ADCX l RFtng t

DAC

PA

n antenpht khc

CU TRC K HIU OFDM

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Sng mang con

hoa tiu

Sng mang con

s liu

Sng mang con

bo v

f

Cu trc sng mang con OFDMA

SP XP KNH CON (1/2)

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Bng thng (MHz) 1,25 5 10 20

Kch thc FFT 128 512 1024 2048

S sng mang con bov (tri) 11 43 87 173

S sng mang con bov(phi) 10 42 86 172

S sng mang sliu 96 384 768 1536

S sng mang con hoa tiu 11 43 83 167

S knh con s liu (s sng mang

con trn nhm)

2 8 16 32

S sng mang con trn knh con (s

nhm)

48 48 48 48

Cc cu hnh knh FUSC c s

( )

S

px

pknhDL-FUSC

SP XP KNH CON (2/1)

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Spxpk

nhPUSC K hiu chn

K hiu l

a) Cu trc cm 14x2 DL PUSC

b) Cu trc lt 4x3UL PUSC

c) Cu trc lt 3x3UL OPUSC

Sng mang

con (tn s)

KhiuOFDM

(thigian

)

Sng mang con

hoa tiu

Sng mang

con s liu

DL: Down Link ng xung;UL: Up LinK: ng ln

Cc cu trc DL PUSC v UL PUSC

( )

SP XP KNH CON (3/1)

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Spxp

AMC

Bng 1

Bin1

Bin2

Bin3

Bin4

Bng 2

Bng 1 Bng 2

Bng N

8 sng mang con s liu + 1sng mang con hoa tiu

KhiuO

FDM

(thigian

)

Sng mang con

(tn s)

Bin1

Bin2

Bin3

Bin1

Bin2

Bin3

Bin1

Bin2

Bin1

Bin2

B

in1

B

in2

Bin1

Bin2

Bin1

Bin2

Bin3

Bin4

Bin1

Bin1

B

in1

Bin1

Bin1

Bin1

Knh con AMC 3x2 Knh con AMC 2x3 Knh con AMC Knh con AMC 1x6

Cc cu hnh knh con c t chc theo BIN trong AMC

( )

IU CH V M HA

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802.16e h tr BPSK, QPSK c sp xp theo

m Gray, 16-QAM, 64 QAM. Cc ty chn m

ha knh trong 802.16e gm:

M ha lp (2x, 4x, 6x) cho cc tn hiu iu

khin

M haxonvidtngcng

M ha turboxon CTCvidtngcng

M ha khi turboM ha kim tra chnlmtthp LDPC

Dngiuch v m ha trong lpvt l bng:

IU CH V M HA

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Cc dng iu ch v m ha c s dng lp vt l

ng xung (DL) ng ln (UL)

iu ch QPSK, 16QAM, 64QAM QPSK, 16QAM, 64QAM

T l m

CC 1/2, 2/3, 3/4, 5/6 1/2, 2/3,5/6

CTC 1/2, 2/3, 3/4, 5/6 1/2, 2/3, 5/6

Lp x2, x4, x6 x2, x4, x6

CIU CH V M HA

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Tcsliuvtlch

occknhc

onPUSC

Thng s DL UL DL UL

Bng thng hthng 5MHz 10 MHz

Kch thc FFT 512 1024

Cc sng mang con rng 92 104 184 184

Cc sng mang con hoa tiu 60 136 120 280

Cc sng mang con sliu 360 272 720 560

Cc knh con 15 17 30 35

Thi gian k hiu, T 102,9s

Thi gian khung 5ms

S k hiu trn khung 48

S k hiusliu 44

IU CH V M HAC

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Ch iu

ch

T l mKnh 5MHz Knh 10MHz

Tc DL,Mbps

Tc UL,Mbps

Tc DL,Mbps

Tc UL, Mbps

QPSK

1/2 CTC, 6x 0,53 0,38 1,06 0,78

1/2 CTC, 4x 0,79 0,57 1,58 1,18

1/2 CTC, 2x 1,58 1,14 3,17 2,35

1/2 CTC, 1x 3,17 2,28 6,34 4,70

3/4 CTC 4,75 3,43 9,50 7,06

16 QAM1/2 CTC 6,34 4,57 12,67 9,41

3/4 CTC 9,50 6,85 19,01 14,11

64 QAM

1/2 CTC 9,50 6,85 19,01 14,11

2/3 CTC 12,67 9,14 25,34 18,82

3/4 CTC 14,26 10,28 28,51 21,17

5/6 CTC 15,84 11,42 31,68 23,52Tcsliuvtlch

occknhc

onPUSC

ANTEN THNG MINH

MO

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nh trngs to bp

M haknh

Sp xpk hiu

Sp xpknh con

Sp xpknh con

Sp xp

knh con

Gii spxp

Gii mknh

K hiu:

STC Enc: STC Encoder:b m ha STCVSM: Vertical Space Multiplexing: ghp knh khng gian ngAMS: Adaptive MIMO Switching

Chuynm

chthchng

choccch

MIM

ANTEN THNG MINH

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Cc tc s liu cho cc cu hnh SIMO/MIMO khc nhau

Cc tc s liu cho cc cu hnh SIMO/MIMO khc nhau(cho knh 10 MHz, khung 5ms, knh con PUSC, 44 k hiu OFDM s liu)

T l DL/UL 1:0 3:1 2:1 3:2 1:1 0:1

Tc nh

cungi sdng

(Mbps)

SIMO(1x2)

DL 31,68 23,04 20,16 18,72 15,84 0

UL 0 4,03 5,04 6,05 7,06 14,11MIMO(2x2)

DL 63,8 46,08 40,32 37.44 31,68 0

UL 0 4,03 5,04 6,05 7,06 14,11

Tc nhcaon

(Mbps)

SIMO(1x2)

DL 31,68 23,04 20,16 18,72 15,84 0

UL 0 4,03 5,04 6,05 7,06 14,11

MIMO(2x2)

DL 63,8 46,08 40,32 37.44 31,68 0

UL 0 8,06 10,08 12,10 14,12 28,22

CU TRC KHUNG TDD

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802.16e PHYhtrc hai cu trc khung TDD v FDD vi di t2ms

n 20ms:FDD pngnhu cucathtrngnikhng thsdngTDD do quy

nh tn s hoc trin khai FDD thun li hn; bng thng ng

ln/xungca FDD cnh v bngnhau.

TDD ihic cc bin php chngnhiu, tuy nhin TDD c liim sau:

TDD cho php iuchnh t lng ln/ngxungh trhiu

qululngngln/ngxungkhng ixng.

TDD mbo tnh iln knh ngln v ngxungvthhtr

tthn cho truyndn thch ng, MIMO v cc cng ngh anten tin

tin vng kn khc.

TDD chcnmtknh mang tnsvthcho php thch ngtthni

vi cc cp phttnskhc nhau trn thgii

Thitkmy pht thu TDD tphctphn v vthrtinhn.

CU TRC KHUNG TDD

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k

Cm DL #3

Cm DL#1

Tint

FCH

DL-MAP

U

L-MAP

Cm DL #2

Cm DL #4

Cm DL #5

Cm UL #1

Cm UL #2

Cm UL #3

Cm UL #4

Cm DL #5Hi tip nhanh(CQICH)

Tint

DL-MAP

FCHk+1 k+3 k+5 k+7 k+9 k+11 k+13 k+15 k+17 k+20 k+23 k+26 k+30 k+31 k+33

Khung con DL TTG Khung conUL RTG

S

tht

l

ogick

nhcon

ss+1s+2

s+Lnhc ly

ACK-CH

S th t k hiu OFDM

Cu trc khung OFDMA TDD (ch cho vng bt buc)

TNH NNG TIN TIN

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PU

SC

(TintDLY)

Ti

nt

PU

SC

(Vng

utin

cha

FCH

v

DL-MAP)

PU

SC

(TintDLX)

PU

SC

(TintDLZ)

FUSC

tychn

M

AC

TU

SC1

TU

SC2

PU

SC

PUS

C

ty

chn

AMC

Phi c trong mi khung

C th xut hin trong mt khung

Cc phn t IE chuyn mch

vng trong DL-MAP

Khung con DL Khung con UL

IE: Information Element: phn t thng tin

Cu trc khung a vng

T

isdngtnsmtph

n

TNH NNG TIN TIN

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Dchv

aphngvqungb

(MBS)

Tint

DLMAPn

n

PCH

Vng

H-A

R

Q

(Vo

IP)

Vng

MBS

M

BSMAP

nhcly

ACK

CQICH V

ng

H-A

R

Q

(Vo

IP)

Vng PUSC 1 Vng PUSC STC Vng MBS PUSC STC Vng PUSC

Khung con DL Khung con UP

HtrMBS nhng bng cc vng MBS

QU NG TRUYN

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Cc thng scahthng WiMAX di ngCc thngshthngWIMAX di ngCc thngsOFDMA

M hnh truyn sng

Qungtruyn WiMAXQungtruyn DL cho WIMAX di ng

Qungtruyn UL cho WIMAX di ng

7

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M phng WiMAX

7

M hnh v lu m phng knh ng xung

Cu hnh m phng v kch bn knh v tuyn

Kt qu m phng

M phng knh v tuyn trong min thi gian v tn s

Trc quan ha nguyn l hot ng dng m phng tn hiu c trngca m hnh

Hiu nng BER v dung lng h thng

M hnh v lu m phng knh ng xung

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Chn CP

Tp m trng(AWGN)

Sp xp k

hiu iu ch(QPSK,

16QAM)

Sp xpknh conv chn

hoa tiu

Knh phainh ang

Kh CP

c tnhknh SNR

da vo hoatiu

P/

S

IFFT

S/

P

FFT S/

P

Gii sp xpknh con v

tch hoa

tiu

Tnhton

BER

Tch sng

mang d liuGii iu ch

(QPSK,16QAM)Khanxen

Giim

haxon

Kh

ngunhin

ha

D

liungi

dng

Dliungi

dng

Ngunhinha

Mhax

on

anxe

n

D liu t ngi dng

Nhp cc thng s knh v tuyn (kch bn knh); thng s m phng;

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Lu

m

phng

knh

ng

xung

thng s cu hnh knh ng xung

Truyn d liu n ngi dng

ngGii iu ch; Khi phc d liu ngidng

Gii m ha knh; Kh an xen; Khngu nhin ha

c tnh knh (SNR) da vo hoa tiu/mi thc hin knh

Tnh BER v hin th kt qu

c tnh knh (SNR) da vo hoa tiu/kch bn knh

nframe=nframe+1

nTime=nTime+1

Ly mu knh pha inh a ng

Ngu nhin ha; M ha knh; an xen; Xp xp k hiu iu ch (QPSK,16QAM); Xp xp sng mang d liu; Chn sng mang hoa tiu; Chuyn i

ni tip thnh song song S/P

Tch sng mang con d liu; Tch sng mang con hoa tiu

Thc hin IFFT; Chuyn i song song ni tip P/S; Chn tin t tun hon CP

Qua knh pha inh a ng

Kh tin t tun hon CP; Chuyn i S/P; Thc hin FFT

nh dng cc cu hnh knh FUSC c s

Sai

ng

Sai

nTime

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Bng thng (MHz) ,

Tnslymu (MHz) 1,4 5,6 11,2 22,4

Kch thc FFT 128 512 1024 2048

S sng mang con bov (tri) 11 43 87 173

S sng mang con bov(phi) 10 42 86 172

S sng mang sliu 96 384 768 1536

S sng mang con hoa tiu 11 43 83 167

S knh con s liu (s sng mang contrn nhm)

2 8 16 32

S sng mang con trn knh con (snhm)

48 48 48 48

Khong cch sng mang con 10,94 KHzThi gian hiudng TFFT 91,4 s

Thi gian bov, TGD 11,4 s

di k hiu T=TGD+TFFT 102,9 s

S k hiu OFDMA trong khung 5ms 48

Cu

hnhknh

FUSCc

s

Cu trc sng mang con OFDMA v kch bn knh v tuyn

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-16,0-25,2-10,0-12,80-2,5

20000171001290089003000(ns)i xe B

(L=6)

-20,0-15,0-10,0-9,0-1,00

2510173010907103100(ns)i xe A

(L=6)

-23,9-7,8-8,0-4,9-0,90

3700230012008002000(ns)i b B

(L=6)

-22,8-19,2-9,70NANA

4101901100(ns)i b A

(L=4)

543210

2

la (dB)

2

la (dB)

2

la (dB)

2

la (dB)

Sng mang con

hoa tiu

Sng mang con

s liu

Sng mang conbo v

f

M phng knh v tuyn di ng

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Trc quan ha nguyn l hot ng

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Hiu nng BER v dung lng

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Kt lun (1)

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Tng quan h tiu chun IEEE802.16 v WIMAXForum

Xt qu trnh hnh thnh cc chun khc nhau trong hchun 802.16nh:802.16, 802.16a, 802.16-2004 v 802.16e.

Xt shnh thnh ca WiMAX Forum v vai tr ca n trong victnghpton cu cc thitbda trn chunmca IEEE. 802.16.

Knh v tuyn di ng Trnh by hai mi trngtruyndn v tuynthngcsdng: LOS v

NLOS, WiMAXcthitksdngtiu trong c hai mi trngny.

Trnh byngngn phn bRayleigh v Rice, v csdngmphng

ngtruyn NLOS.

Trnh by m hnh knh v tuyn cng vi cc thng s knh, phn loiphainhphm vi hp theo cc thng sknh v tuyn, cc thng soccthtrong mi trngv tuyn cc nh thitkcc hthngWiMAXa ra

cc thng scho OFDM, cc thng sknh mphngknh WiMAX.

Kt lun (2)

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X l tn hiu OFDM:Xt cc phng php x l s

c bn trong cc h thng OFDM nh:

ng b tn s

c tnh knh

B tr tp m pha

Gim t s cng sut nh trn cng sut trung bnh PAPR

B tr cn bng I/Q

Kt qu c trnh by l c s cc nh thit k cc h thngWiMAXa ra cc tiu chunlpvtl cho giao din v tuyn; lm

cs trnh by lpvt l ca WIMAXcnh v di ng,cng

nhmphngknh truyndncahthngOFDM.

Kt lun (3)

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Giao din v tuyn cho cc hthng khng dy bng

rngcnhca WiMAX Xt giao din v tuyn trn c s hai lp MAC v PHY ca chun IEEE

802.16e-2005, trong cc lp con ca MACc xt tngquan.

PHYca IEEE 802.16e -2005 c bndng:

WirlessMAN-SC(iuchn sng mang) WirelessMAN-SCa (iuchn sng mang)

WirelessMAN-OFDM

WirelessMAN- OFDMA

Trong WirlessMAN-SC PHYmbotruyntrcx LOS n sng mangtrong ditnt10 n 66 GHz, ba m hnh PHY cn licho php truyndnkhng trcx NLOS trong ditn thp hn 11 GHz.

C th ha cho hai dng PHY: WirelessMAN-OFDM v WirelessMAN-OFDMA.

Kt lun (4)

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Lp MAC ca WIMAX di ngVai tr calp MAC l mbolulngdngcmvi yu cu

tcnh cao trong khi vnngthihtrlulnglungvlulngthoinhycmtrtrn cng mtknh. Cc ti nguyndo b lpbiu MACnnh cho ucui c th thay i tmt

khe thi gian n ton b khung, v thcung cpding thnglngrtln cho tngmy ucuititngthiim. Ngoi rathng tin nnh ti nguyn c mang trong cc bn tin MAP tiu khung, b lpbiu c th thay ihiuquvicnnh ti

nguyn theo tngkhung thch ngtnh chtcmcalulng.IEEE 802.16 MACh trhai kiukin trc mng: imaimPMP v mnghnhp.

Xtcu trc chung ca MAC, cc dchvca MAC, qun l cngsutv di ng, cc tnh nngan ninh.

Kt lun (5)

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M hnh lp vt l v cc tnh nng tin tin

ca WIMAX di ng M hnh lp vt l ca WiMAX di ng/IEEE 802.16e.

M hnh S-OFDMA, cu trc my thu pht, cu trc khung

cng nh cc tnh nng khc ca WIMAX di ng. Hiu nng v ph tn ca WiMAX.

M phng WIMAX di ng

Xy dng m hnh m phng knh ng xung. c tnh knh (SNR) da vo hoa tiu.

Kho st hiu nng BER (SNR) theo cc kch bn knh (tham sknh) nh vn tc di chuyn, s lng hoa tiu ca m hnh.

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Documents

WIMAX-RD2007