mimo - ofdm1(full)
TRANSCRIPT
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TRNG I HC PHNG NGKHOA CNG NGH THNG TIN
TIPHN TCH V KHC PHC NHIU TRONG H
THNG THNG TIN V TUYN, DI NG S
DNG CNG NGH MIMO V GHP KNH OFDM1. Trn Th Chang
Nhm nghin cu: 2. ng Ngc Hng
3. H ng PhLp: 508102TVTKhoa: Cng ngh thng tin
Ngi HDKH: PGS.TS PHAN HU HUN
H N i 03/2012
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TITng quan v
nhiu trongh thngthng tinv tuyn
M hnh knh vtuyn v phn
tch nhiu ISI, ICItrong h thng
MIMO - OFDM
c lng knhv s tritnhiu trongh thng
MIMO OFDM.
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TNG QUAN
NhiungknhCCI
Nhiutrng
Nhiuknh
gn kACI
Nhiuxuynk tISI
Nhiuxuynknh
ICI
N h i u
T nhin Nhn to
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Knhh(t)
x(t)Tn hiu pht
y(t)Tn hiu thu
Nhiun(t)
M hnh knh thng tin c nhiu
Tn hiu thu: y(t) = x(t) * h(t) + n(t)
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2. Tnh ton t s cng sut C/I
3. Xc nh mi quan h gia C/I v S/Ihoc xc sut li Pc
1.Tnh ton hoc c lng mt cng sut nhiu
4. Xc nh quan h gia S/I hoc Pcv hiu nng h thng
5. Xc nh quan h gia hiu nng v mc thay itham s ca h thng
6. S dng t s C/I nh l php o ti uha s cp pht ti nguyn v cht lng
7.Khai thc k thut, cc tiu chun gim nhiu vxc nh nh hng ca nhiu
Phng
php
phn
tch
nhiu
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Tn hiu
Tng t
(analog)S
(digital)
Xy dng
quan h
ton hc
Tnh t s
cng sut
sng mang
C/I
Tnh t s C/I v S/I
+ H thng PSK
+ H thng di ngt bo
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Knh v tuyn
Suy haong truyn
Phadinga ng
Theong bao
Theop ngtn s
Knh truynkhng
chn lc
tn s(phng)
Knhtruyn
chn lctn s
Knhbin i
nhanh
Knhbin i
chm
Knh
Rayleigh
Knh
Rician
Dchdoppler
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M HNHMIMO Khngtng quan
MIMOTng quan
MonteCarlo
M hnh
m phngngu nhin
Bng hp Bng rng
M hnhtham chiu
NPhn t
L phn mnh
Niphn t
phn tn
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PHN TCHNHIUI S I I C I
Donh hngcc k hiu
trc v sautrong cng
sng mang
diGI
khng
m bo
di GIkhng
m bo di GI
m bo
T I C T V C T I C T V C
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CLNGKNH
Bn m(SemiBlind)
M(Blind)
+Pha thu bit trc v pha v bin +So snh tn hiu nhn cV pilot nguyn thy
=>Tn hiu chun hay khng khi phc
+ Pha thu khng bit vtn hiu pht v p ngxung knh+ Tn hiu: ngu nhin
hoc tin nh+ Bin i theogian chm
+ Ci thin tc
hi t+ Cp nht hs, cn bngknh+ Tch knh
ph thuc
Pilot(PSAM)
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PILOTMin
Thi gian
B lc bnh phng ti thiu (LS)
Min
Tn s
Cn bng tn hiu cho h thng MIMO - OFDM
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Bcn
bngknh
MIMO-
OFDM
Bphnknhhocmha
STBC
Tnh
tonphn bICI
Tnhton
phn bICI
iuch li
Giiiuch
iuch li
Gii
iuch
Tr mtmu tn
hiu
OFDM
Tnhtonthnh
phnnhiu ISI
Tr mtmu tn
hiuOFDM
Tnhtonthnhphn
nhiu ISI
Bphnknhhocmha
STBC
Bcn
bngknhMIMO-OFDM
TritISI
B ICI
CSI
CSI
a:(I=1)
b:(I>1)
B
A S TRIT NHIU (MIMO OFDM)
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Chn pha ban u
Cn bng knh cho h thng MIMO - OFDM
K thut iu bin v gii iu bin
ng dng thng tin v trng thi knh CSI
Chun b cho ln lp tip theo
Tnh ton phn bICI
Tnh ton nhiuISI
Trit nhiu ISI
B ICI
Thut ton
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MIMO&
OFDM
Kim v Stuber
Suyama
Trn min thi gianTnh nhiu ISI v phn b ICI
Dng IFFT
Trn min tn sTnh nhiu ISI v nhiu ICI
Dng FFT chuyn i
Dng MAP tnh nhiuhiu nng cao nhng
phi c lng knh ttv ph thuc GI
K thut c lng knhGii php v GI Khi phc chnh xc knh truyn
S dng hiu qu bng thng.
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Trong h thng thng tinhin nay, vic x l bng thngrng vi tc cao ang l xu
hng chung. l nhng vn quan trng lin quan n vic
nh hng v gii quyttrit nhiu.
KT LUN
Bng vic vn dng cc kin thc hc, ti liu tham kho v p
dng mt s thnh tu khoa hc k thut, nhm chng em
thc hin nghin cu
ti Phn tch v khc phcnhiu trong h thng
thng tin v tuyn, di ng sdng cng ngh MIMOv ghp knh OFDM.
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