56318399 tong quan ve mimo wiki

7/29/2019 56318399 Tong Quan Ve MIMO Wiki

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MIMOT Wikipedia ting Vit(i hng t SU-MIMO )

Bi vit ny l v

MIMO trong giao ti

p khng dy.

s dng khc, xem MIMO

(nh hng) .

S hiu bit ca SISO, SIMO, MISO v MIMO (lu rng cc iu khon

u

vo v

u ra tham kho cc knh pht thanh mang tn hiu, khng cc thitb c ng-ten)

Trong pht thanh , nhiu u vo v u ra-a , hoc MIMO (thng c

pht m ca ti B Y t hoc B Y t cho ti-), l vic s dng nhiu anten my pht v nhn c hai ci thin hiu sut truyn thng. y l mt trongnhiu hnh thc cang-ten thng minh cng ngh. Lu rng cc iu kin

u

vo v

u ra tham kho cc i pht thanh knh mang tn hiu, khng cc

thit b c ng-ten.

Cng ngh MIMO thu ht s ch khng dythng tin lin lc, bi v n cungcp tng ng k thng lng d liu v phm vi lin kt m khng cn bngthng b sung hoc truyn ti in nng.N t c iu ny bng cch hiuqu quang ph cao hn (nhiu bit / giy cho mi hc bng thng) v tin cylin kt hoc a dng (gim dn). V nhng ti sn, nh vy MIMO mt l quan


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trng hin i truyn thng khng dy ca mt phn cc tiu chun IEEE802.11n (Wifi), 4G , 3GPP Long Term Evolution , WiMAX v HSPA + .

Ni dung[ n ]

1 Lch s ca MIMO

o 1,1 nn cng ngh

o 1,2 Nguyn tc

o 1,3 tiu chun khng dy

2 Chc nng ca MIMO

3 hnh thc MIMO

o 3,1 Multi-ng-ten cc loi

o 3,2 Multi-ngi s dng cc loi

4 Cc ng dng ca MIMO5 Ton hc m t

6 MIMO th nghim

7 MIMO vn hc

o 7,1 nghin cu chnh

o 7,2 -ghp knh a dng cn bng (DMT)

o 7,3 Cc ng dng khc

8 Xem thm

o 8,1 cng ngh ng ten thng minho 8,2 k thut khng gian

9 Ti liu tham kho

10 Lin kt ngoi

o 10,1 trang web

o 10,2 Sch

[sa ]Lch s ca MIMO

[sa ]Bi cnh cng ngh

Nhng tng u tin trong lnh vc ny tr li lm vic bi AR Kaye v DAGeorge (1970) v W. van Etten (1975, 1976). Jack ma ng v Jack Salzti Bell Laboratories xut bn mt s giy t vbeamforming ng dng lin quanvo nm 1984 v 1986. [ 1 ][sa ]Nguyn tc


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Arogyaswami Paulraj v Thomas Kailath xut cc khi nim v khng gianmultiplexing ) s dng MIMO SM (vo nm 1993. 5.345.599 ca h s bngsng ch v khng gian Multiplexing ban hnh nm 1994 [ 2 ]nhn mnh ccng dng pht sng khng dy.

Nm 1996, Greg Raleigh v Gerard J. Foschini mi phng php tinh ch vicng ngh MIMO, xem xt mt cu hnh m nhiu ng-ten truyn l ng t timt my pht ci thin thng qua lin kt c hiu qu. [ 3 ] [ 4 ]Bell Labs l ngi u tin chng minh mt nguyn mu trong phng th nghimca ghp knh khng gian vo nm 1998, ni khng gian l mt cng ngh ghpknh ch yu ci thin hiu sut ca h thng thng tin MIMO. [ 5 ][sa ]khng dy tiu chunXem thm: cng ngh

MIMO trong WiMA Xv cng ngh

MIMO trong cc tiu

chu

n di ng 3G

Trong lnh vc thng mi, Iospan Wireless Inc pht trin h thng thng miu tin vo nm 2001 m c s dng MIMO vi tn s trc giao a truynhp phn chia theo cng ngh (MIMO-OFDMA). Iospan h tr c cng ngh adng m ha v ghp knh khng gian. Trong nm 2005,Airgo Networks pht trin mt IEEE 802.11n thc hin da trn tin thn bng sng ch ca hv MIMO. Tip theo trong nm 2006, mt s cng ty (bao gm tnht Broadcom , Intel , v Marvell ) c mt qu c MIMO-OFDM gii php datrn tiu chun cho tin tiu chun WiFi 802.11n. Cng trong nm 2006, mt scng ty (Beceem Communications, Samsung, Runcom cng ngh, vv) phttrin MIMO-OFDMA cho gii php da trnchun IEEE 802.16e WiMAX bngthng rng di ng chun. Tt c cc sp ti 4G h thng cng s s dng cngngh MIMO. Mt vi nhm nghin cu chng minh hn 1 Gbit / s nguynmu.[sa ]Chc nng ca MIMO

MIMO c th c phn chia thnh ba loi chnh, precoding , khng gianghp hoc SM, v a dng m ha .

Precoding l dng a beamforming , trong nh ngha hp. Trong nhng thutng chung, n c coi l tt c khng gian ch bin xy ra my pht. In(single-layer) beamforming, cng mt tn hiu c pht ra t mi ca ng-tentruyn vi giai on thch hp (v i khi t c) trng nh vy m tn hiuc ti a ha quyn lc u vo thu. Nhng li ch ca beamforming l tng thu tn hiu nhn c, bng cch lm cho tn hiu pht ra t ng-ten khc


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nhau gn ln cch xy dng, v gim hiu ng m dn a. Trong trng hpkhng tn x, beamforming kt qu trong mt hng xc nh m hnh tt,nhng in hnh ca t bo thng thng dm khng phi l mt tng ttt. Khi ngi nhn c nhiu ng-ten, cc truyn ti beamforming c th khng

ng thi ti a ha mc tn hiu tt c cc ng-ten nhn c, vprecoding vi nhiu dng c s dng. Lu rng precoding i hi kin thcca thng tin trng thi knh (CSI) my pht.Ghp knh khng gian i hi cu hnh ng ten MIMO. Trong ghp knh khng

gian, mt tn hiu tc cao c chia thnh cc mc gi thp hn nhiu dngv mi dng c truyn t mt ng ten truyn khc nhau trong cng mt knhtn s. Nu cc tn hiu ny n mng ng ten tip nhn vi y ch k khcnhau v khng gian, ngi nhn c th tch bit cc dng vo (gn nh) cc

knh song song. Ghp knh khng gian l mt k thut rt mnh m tngcng sut knh cao hn tn hiu-to-noise t l (SNR). S lng ti a khnggian sui c gii hn bi t hn v s lng ng ten ti my pht hocnhn. ghp knh khng gian c th c s dng c hoc khng c kin thctruyn knh. ghp knh khng gian cng c th c s dng truyn ti ngthi nhiu ngi nhn, c gi l a truy nhp phn chia khng gian . Bngcch lp k hoch thu vi khng gian ch k khc nhau, tch tt c th cm bo.

a dng m ha cc k thut c s dng khi khng c kin thc knh my

pht. Trong phng php a dng, mt dng n (khng ging nh nhiu dngtrong ghp knh khng gian) c truyn i, nhng cc tn hiu c m hobng cch s dng cc k thut c gi l khng-thi gian m ha . Cc tnhiu c pht ra t mi ca ng-ten truyn ti vi y hoc gn trc giaom ha. a dng m khai thc cc fading c lp trong cc lin kt nhiu anten tng cng s a dng tn hiu. V khng c kin thc knh, khng cbeamforming hoc c mng t s a dng m ha.ghp knh khng gian cng c th c kt hp vi precoding khi knh truyn

c bit n hoc kt hp vi m ha a dng khi gii m s ng tin cytrong thng mi-off.[sa ]Cc hnh thc MIMO

[sa ]Multi-ng-ten cc loi


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Tp tin: MIMO communications.svg n nay, [khi no? ] a ng-ten MIMO (hoc

n s dng MIMO) cng ngh c ch yu l pht trin v c thc hintrong mt s tiu chun, v d nh cc sn phm 802.11n.

SISO / SIMO / MISO l suy bin trng hp ca MIMO Nhiu u vo v u ra-n (MISO) l mt trng hp suy bin khi

ngi nhn c mt ng ten duy nht. n u vo v u ra-a (SIMO) l mt trng hp thoi ha khi my

pht c mt ng ten duy nht. n u vo u ra n (SISO) l mt h thng i pht thanh m khng

phi l nh truyn nhn u khng c nhiu ng-ten.

Hiu trng n ngi dng k thut MIMO

Phng th nghim Bell Layered Space-Time (BLAST) , Gerard. J. Foschini(1996)

T l mi Antenna Control (PARC), Varanasi, Guess (1998), Chung,Hong, Lozano (2001)

T l chn lc mi Antenna Control (SPARC), Ericsson (2004)

Mt s hn ch Khong cch gia ng ten vt l c la chn l ln; nhiu bc

sng ti cc trm c s. Vic tch ng ten pha thu c rt nhiukhng gian hn ch trong b tay, mc d ng ten tin tin v k thut thitk thut ton ang c tho lun. Tham kh

o: Advanced MIMO

[sa ]nhiu ngi dng cc loiBi chi ti

t: Multi-ngi s dng MIMO

Gn y, cc nghin cu v cng ngh MIMO nhiu ngi s dng cang ni ln. Trong khi nhiu ngi s dng MIMO y (hoc mng MIMO)c th c tim nng cao hn, t thc tin ca cc nghin cu v MIMO angi dng (mt phn) (hoc nhiu ngi s dng v a ng ten MIMO) cng

ngh l hot ng nhiu hn.

Nhiu ngi s dng MIMO (MU-MIMO) Trong gn y 3GPP v WiMAX tiu chun, MU-MIMO ang c coi l

mt trong nhng ng c vin chp nhn vi cc cng ngh trong c tbi rt nhiu cng ty nh Samsung, Intel, Qualcomm, Ericsson, TI,


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Huawei, Philips, Alcatel-Lucent, Freescale, et al . k t khi MU-MIMO lkh thi hn in thoi di ng phc tp thp vi s lng nh cc ng-ten tip nhn hn MIMO-SU vi kh nng thng qua h thng cao.

PU 2 RC cho php mng li phn phi mi ng-ten cho ngi s dng

khc nhau thay v ch cp cho ngi dng n nh trong lp k hoch sdng MIMO-n. Cc mng c th truyn d liu ngi dng thng quamt cn c khng gian tia-codebook hay o mt ng ten. Hiu qu sdng nng lp k hoch, chng hn nh kt ni khng gian ngi dngphn bit vi khng gian da codebook dm, c thm tho lun ngin ha cc mng khng dy v ti nguyn yu cu khng dy b sungv sa i giao thc phc tp. Gn y, PU 2 RC c bao gm cc tiliu m t h thng (SDD) ca IEEE 802.16m (WiMAX tin ha p

ng cc ITU-R ca IMT-Advance yu cu). Tng cng a ngi dng MIMO: 1) S dng cc k thut tin tin gii

m, 2) S dng cc k thut tin tin precoding SDMA i din cho mt trong hai khng gian a truy nhp phn chia hoc

phn chia nhiu siu truy cp ni m siu nhn mnh rng b phn trc

giao nh tn s v phn chia thi gian khng s dng nhng phngphp tip cn trc giao khng, chng hn nh v tr siu m ha c sdng.

Hp tc x MIMO (CO-MIMO) Phn phi s dng ng-ten m thuc v ngi dng khc.

MIMO tuyn

nh tuyn mt cm bi mt m my mi hop, c s lng cc nttrong mi cm l ln hn hoc bng mt. MIMO nh tuyn l khc nhaut thng thng (SISO) nh tuyn k t khi tuyn ng giao thc thngthng mt nt bng mt nt trong mi hop [ 6 ] .

[sa ]Cc ng dng ca MIMO

k thut ghp knh khng gian lm cho ngi nhn rt phc tp, v do nthng c kt hp vighp knh phn chia tn s trc giao- (OFDM) hocvi tn s trc giao Division Multiple Access (OFDMA) iu ch, ni cc vn to ra bi con ng a knh c x l hiu qu. Cc IEEE 802.16e tiuchun kt hp MIMO-OFDMA. Cc tiu chun IEEE 802.11n, pht hnh vothng 10 nm 2009, ngh MIMO-OFDM.


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MIMO cng d kin s c s dng trong in thoi v tuyn di ng tiuchun nh gn y 3GPP v3GPP2 tiu chun. Trong 3GPP, High-SpeedPacket Access cng (HSPA +) v Long Term Evolution (LTE)tiu chun cMIMO vo ti khon. Hn na, h tr y cc mi trng di ng MIMO

lin hip nghin cu bao gm IST-linh vt xut pht trin cc k thutMIMO tin tin, ngha l, nhiu ngi s dng MIMO (MU-MIMO) .[sa ]Ton hc m t

M hnh knh MIMO

Trong cc h thng MIMO, pht mt gi nhiu dng bng cch truyn nhiu ng-ten. Cc dng truyn i qua mt ma trn knh bao gm tt c cc N t N rngdn giaN tng-ten truyn ti my pht vN rnhn c ng-ten ngi

nhn. Sau , nhn c tn hiu nhn c vect bi nhiu ngi nhn c

ng-ten v gii m cc vect tn hiu nhn c vo nhng thng tin banu. A hpfading phng h thng MIMO l m hnh ha nh

ni v l nhn v truyn cc vector, tng ng, v v l knh ma trnv vector ting n, tng ng.

Ngi ta cho rng bi vit ny hocphn c sp nhp vo knh cngsu

t . ( Tho lun )

cp n l thuyt thng tin , cc ergodic dung lng knh ca h thngMIMO m c hai my pht v ngi nhn hon ho ngay lp tc thngtin trng thi knh l [ 7 ]

ni ()Hl bt transpose Hermitian v l t s gia truyn ti in nng

v quyn lc ting n (v d, truyn SNR ). Cc hip phng sai tn hiu


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ti u l t c thng qua phn hy gi tr s tca knh matrn v mt quyn lc ti u giao ma trn ngcho . Vic phn b in nng ti u tc thng qua waterfilling [ 8 ] , l

ni l nhng yu t ng cho ca ,bng khng nu i s ca n l tiu cc, v l la chn nh vy

m .Nu my pht ch c thng k thng tin trng thi knh , sau lergodic dung lng knh s gim khi cc hip phng sai tn hiuch c th c ti u ha v mt trung bnh thng tin ln

nhau l [ 7 ]

Cc mi tng quan khng gian ca knh c mt tc ngmnh n ergodic dung lng knh thng tin thng k.Nu my pht khng c knh thng tin trng thi c th chncc hip phng sai tn hiu ti a ha nng lc knh theothng k trng hp xu nht, c ngha l v ph hp

Ty thuc vo tnh cht thng k ca knh, cng sutergodic l khng ln hn ln hn so vi mt hthng SISO ln.[sa ]MIMO th nghim

MIMO tn hiu kim tra tp trung u tin trn truyn / hthng thu. Cc giai on ngu nhin ca tn hiu sng mangph c th sn xut cc mc cng sut tc thi m gy ra

b khuch i nn, trong giy lt gy bin dng v libiu tng cui cng. Tn hiu vi mt cao, ci cch hnhchnh (cao im t l trung bnh) t l c th gy ra cc b

khuch i nn t trong qu trnh truyn. OFDM tn hiuc rt nng ng v vn nn c th c kh phthin v bn cht ging nh ting n ca h.


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Bit c cht lng ca cc knh tn hiu cng rt quantrng. Mt knh gi lp c th m phng nh th no mtthit b thc hin ra t bo, c th thm ting n hoc cth m phng nhng g trng ging nh cc knh tc

. hon ton iu kin hot ng ca mt my thu,mt my pht hiu chun, chng hn nh mt my pht tnhiu vector (VSG) v knh gi lp c th c s dng th nghim cc my thu di nhiu iu kin khcnhau. Ngc li, hiu sut ca my pht theo mt s iukin khc nhau c th c xc minh bng cch s dngmt knh gi lp v mt b tip nhn hiu chun, chnghn nh mt phn tch tn hiu vector (VSA).

Tm hiu v cc knh cho php cho cc thao tc ca giaion ny v bin ca tng my pht hnh thnh mtchm. chnh xc to thnh mt chm tia, my pht cnphi hiu cc c tnh ca knh. Qu trnh ny c gil knh m hoc c lng knh . Mt tn hiu c bit

n s c gi n cc thit b di ng cho php n xy dng mt hnh nh ca mi trng knh. Chic inthoi ny sau s gi li cc c tnh knh mypht. Cc my pht sau c th p dng cc giai on

chnh xc v iu chnh bin to thnh mt chm tiahng vo cc thit b di ng. iu ny c gi l mtvng lp h thng MIMO-ng ca. i vi beamforming,n l cn thit iu chnh cc pha v bin ca tngmy pht.[sa ]MIMO vn hc

[sa ]Hiu trng nghin cu

Giy t ca Gerard J. Foschini v Michael J.

Gans, [ 9 ] Foschini [ 10 ] v Emre Telatar ch rarngdung lng knh (mt l thuyt trn rng buc vothng qua h thng) cho mt h thng MIMO c tng lnkhi s lng ng-ten tng ln , t l thun vi s lng tithiu ca truyn v nhn ng-ten. Pht hin c bn trong lthuyt thng tin l nhng g dn n s bt ph ca nghin


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[sa ]Tham kho

1. ^ J. Salz, "k thut s truyn qua kt qua knh tuyn

tnh," AT & T Technical Journal, vol. 64, khng c. 6,

trang 1147-1159, thng by thng tm nm 1985.2. ^http://patft.uspto.gov/netacgi/nph-

Parser?Sect2=PTO1&Sect2=HITOFF&p=1&u =%2Fnetahtml% 2FPTO% bool.html-2Fsearch & r = 1 &f = G & l = 50 & d = Pall & RefSrch = yes & Query =PN 2F5345599%

3. ^ Gregory G. Raleigh v John M. Cioffi, "khng thi

gian m ha cho truyn thng khng dy," IEEE giaodch v truyn thng, tp. 46 tui, khng c. 3, trang357-366, thng ba nm 1998.

4. ^ GJ Foschini, "phn lp khng-thi gian kin trc

cho cc giao tip khng dy trong mt mi trngm dn khi s dng nhiu ng-ten", Bell LabsSyst. Cng ngh cao. J., vol. 1, p. 41-59, ma thunm 1996.

5. ^ GD vng, GJ Foschini, RA Valenzuela, v PW

Wolniansky, "Pht hin ban u ca thut ton v kt

qu phng th nghim bng cch s dng V-BLASTkhng-thi gian kin trc truyn thng," in t. Lettvol.,. 35, tr ~ 14-16, Thng 1 nm 1999.

6. ^ S. Cui, AJ Goldsmith, v 2004) A. Bahai (thng

Tm,. "Nng lng-hiu qu ca MIMO v hp tcMIMO trong cm bin Mng". IEEE J. Select.Lnh vcCommun. 22 (6): 1089-

1098. doi :10.1109/JSAC.2004.830916 .7. ^ a b D. Tnh yu, R. Heath, V. Lau, D. Gesbert, B.

Rao v M. Andrews, Tng quan v thng tin phn hihn ch trong cc h thng truyn thng khng dy ,IEEE Tp ch v cc khu vc c la chn thng,tp 26, trang 1341-1365, nm 2008.


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8. ^ D. T nh Phong v P. Viswanath, nguyn tc c

bn ca truyn thng khng dy , in i hcCambridge, 2005.

9. ^ Gerard J. Foschini v Michael. J. Gans (January

1998). "Ngy gii hn ca truyn thng khng dytrong mt mi trng m dn khi s dng nhiu ng-ten". Wireless thng tin c nhn6 (3): 311-

335. doi : 10,1023 / A: 1008889222784 .10. ^ Gerard J. Foschini (ma thu 1996). "Phn lp

khng gian-thi gian kin trc cho truyn thngkhng dy trong mt mi trng m dn khi s dngnhiu phn t ng-ten". Bell Labs T

p ch k

thut 1 (2): 41-59. doi : 10.1002/bltj.2015 .11. ^ A. Paulraj, R. Nabar v D. Gore. Gii thi

u v

khng gian-thi gian Truyn thng .

12. ^ L. Zheng v T nh Phong DNC (thng 5 nm

2003). "S a dng v ghp knh: c bn s cnbng A-ten nhiu knh khc nhau". IEEETrans.Inf. Th. 49 (5): 1073-

1096. doi :10.1109/TIT.2003.810646 .[sa ]Lin kt ngoi

[sa ]cc trang Web

GEDOMIS (Chung phn cng thao din cho MIMO

Systems) NIST UWB-MIMO knh truyn o trong bng tn 2-8

GHz D. Gesbert, M. Kountouris, RW Heath, Jr, C.-B. Chae, v

Salzer T., Chuyn cc Paradigm MIMO: t ngi dngn truyn thng a ngi dng , x l tn hiu IEEEtp ch, tp. 24, khng c. 5, trang 36-46, thng mi,2007

Lin kt xut cc bi c trong MIMO - WCSPGroup - i hc Nam Florida (USF)

Gii thiu v Wireless MIMO - L thuyt v ng dng


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Gii thiu v phn chia tn s trc giao (bao gm OFDMv cu hnh v tuyn MIMO)

Gii thiu v MIMO Computerworld QuickStudy MIMO Pht trin cc chin lc kim tra MIMO Hi ngh Nhng thch thc ca LTE 4G Test Cc vn c bn ca OFDM MIMO: Tng lai ca Wireless: th thch thc i vi

WiMAX, HSPA +, v LTE OFDM s sm c thng lnh ca mu iu ch k

thut s Nhng thch thc ca vic chuyn sang h thng MIMO

RF th nghim h thng bng 4 x 4 tn hiu MIMO Tng cng cc h thng di ng Tng vn RF

Throughput Test Vai tr ca o EVM Trong din t iu ch Amplifier Cng nghip S ln xem: 4G Systems Mang thit k mi

v thch thc kim tra H thng kim tra tiu chun MIMO Pushes vo

Spotlight Cc Thit b th nghim truyn d liu MIMO

[sa ]Sch

Claude Oestges, Bruno Clerckx, "Truyn thng khngdy MIMO: T thc th gii lan truyn n khng gian-thi gian lut Thit k," hc thut, 2007/07/16,448p, ISBN: 0123725356

Th loi : IEEE 802 | Thng tin l thuyt |i pht thanhqun l ti nguyn


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MIMO (nh hng)T Wikipedia ting VitMIMO c th l:

Nhiu-nhiu u vo-u ra (MIMO) truyn thng , k thut in thng cp n h thng truyn thng khng dy bng cch s dng mt lotcc ng-ten ti my pht v thu c hai Xem thm ng ten a , nng cao MIMO , Hp tc x MIMO cho tin b

gn y ca ng-ten thng minh cng ngh MIMO, trong h thng l thuyt , dng ch mt h thng iu khin vi

nhiu u vo v u ra nhiu Miami hin i Kin trc , m thng vit tt l MIMO

Mimo , mt dng sinh vt nhi sock.i

u ny

nhhng li tknhngbihay ch

c cngtn.N

u mt linkt n i b

b n

n y, b n c th

mu

n thay i cc linkt

n i m trc tip

n

thit .


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Nhiu ngi s dng MIMOT Wikipedia ting VitTrong pht thanh , nhiu ngi s dng MIMO (MU-MIMO) l mt b tin

tin MIMO , u vo v u ra nhiu-nhiu (pht m mee-B Y t

hoc B Y t

ca ti), cng ngh khai thc thit b u cui sn c ca cc i pht thanh c

lp nhiu nng cao kh nng giao tip ca mi thit b u cui c nhn. Ngc li, ngi dng n MIMO ch xem xt quyn truy cp vo nhiu antenc kt ni vt l vi tng thit b u cui c nhn. MU-MIMO c th cxem nh l khi nim m rng ca a truy nhp phn chia khng gian(SDMA) cho php mt thit b u cui truyn ti (hoc nhn) tn hiu vo

(hoc t) nhiu ngi dng trong cng mt ban nhc ng thi. PU2RC l mtc bn v thit thc MU -MIMO cng ngh pht sng v truy cp nhiu thng

tin lin lc khng dy .Ging nh cc mi quan h gia OFDM v OFDMA , MU-MIMO (v, tng tnh vy, SDMA) c th c dng nh mt phn m rng ca MIMO p dngtrong nhiu cch khc nhau nh l mt chin lc truy cp nhiu. Mt khc bitng k l hiu sut ca MU-MIMO da vo precoding kh nng hn OFDMAdo nu khng s dng my pht precoding, s thc thi ca MU-MIMO khngth thnh cng.Nhiu quyn truy cp MIMO, MIMO-SDMA, nhiu ngi truyn ng ten MIMO-

SDMA, Hp tc x MIMO, mng MIMO v Ad-hoc MIMO l tt c cc thut ngca gia nh trong MU-MIMO, v mi ca nhng cng ngh thc y nhiu ngis dng nh l mt mc t do trong vic t c thnh cng i pht thanhtruyn.

Ni dung[ n ]

1 Cng ngh

o 1,1 MIMO

o 1,2 MIMO nng caoo 1,3 MU-MIMO

o 1,4 -chia khng gian a truy cp

o 1,5 Nhiu ng-ten

2 Vic u tin v cui Hop: n v i t ngi dng mt ng ten a v ngi s dng

nhiu hp tc


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o 2,1 MIMO pht sng (MIMO BC)

o 2,2 MIMO MAC

o 2,3 Cross-layer MIMO

3 Multi-ngi s dng a ngi dng

o 3,1 Hp tc x MIMO (CO-MIMO)4 Xem thm

o 4,1 cng ngh lin quan

o 4,2 tiu chun khng dy

o 4,3 s l thuyt

5 Ti liu tham kho

6 Lin kt ngoi

[sa ]Cng ngh

Tp tin: MIMO communications.svg[sa ]MIMO

t c MIMO t mt h thng SISO thng, mt s cng ngh c xut. [ 1 ]

Beamforming c gi l mng x l tn hiu ng-ten, ni m mi phn tng ten c tch ra t phn t gn nht ca n bng mt na bc sngtn hiu truyn.

Khng-thi gian m ha / ch bin thc hin ng ten a dng vi nhiu ng-ten ti hoc bn nhn pht hoc c hai bn, ni m mi phn t ng tenc tch ra t phn t gn nht ca n bng khong 4 n 10 ln cc bcsng gi cho cc tn hiu qua tng con ng-a c lp . Khong cchgia hai phn t ng ten lin k l da vo s ly lan gc ca tn hiu tia.

SDMA l mt ph bin v nhiu in hnh chng trnh u vo u ra nhiutrong cc h thng khng dy di ng. SDMA c thng c gi lMIMO mt h thng n gin l k t khi cng mt na ca mt h thngSDMA cng bao gm nhi

u ngi s dng. Mc d SDMA thc s l mt k

thut MIMO, MIMO khng nht thit phi SDMA. ghp knh khng gian c thc hin bi nhiu ng-ten c trang b c

hai, mt my pht v nhn trc mt kt thc. Hp tc c gi l h thng MIMO mng, h thng MIMO phn phi hoc

cc h thng ng-ten mng o. Thit b di ng s dng hp tc "ng-ten cathit b di ng, mng ng-ten, hoc cc yu t anten l anten o.


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S kt hp ca k thut ni trn, vv[sa ]MIMO nng cao

Nng cao k thut c th c phn loi thnh cc cch tip cn tin ha vcch mng:

Tin ha phng php tip cn:1. S dng mt k thut hin ti vi kh nng PHY nng cao, c th l

mt cu hnh mng 16 16, hoc2. S dng cc thut ton mi MIMO nh precoding hoc nhiu ngi

s dng lp lch trnh my pht. Phng php cch mng: pht trin cc khi nim c bn MIMO mi. V d

v cc phng php cch mng l hp tc x v o ng-ten MIMO v chbin khng gian thng minh nh radar beamforming .

y, da trn ti liu, chng ti tm tt mt s k thut MIMO tin tin mngi s dng nhiu n by:

Cross-layer MIMO: Lp k hoch, vv

Nng cao tinh MIMO: nhiu ngi dng pht hin nh l MLD. Beamforming v SDMA : MIMO ngi dng bit n rng ri n a. Hng ngoi / Phi ti u ha mng hng ngoi. MIMO mng (Net-MIMO).

Nhn thc MIMO da trn cc k thut thng minh. Hp tc / cnh tranh MIMO . Hp tc : UBND huyn , Wyner-Ziv, vv Cnh tranh : L thuyt tr chi , cc gi tin c lp, n MAC cng bng, vv[sa ]MU-MIMO

Nhiu ngi s dng MIMO c th nhiu ngi dng tn dng nh l truyn tiphn phi ti nguyn khng gian, vi chi ph ca phn no x l tn hiu ttin. Trong khi , thng thng, hoc n ngi dng MIMO xem xt nhiuthit b ng-ten kch thc a ch. Nhiu ngi s dng cc thut ton MIMO

c pht trin tng cng h thng MIMO khi s lng ngi s dng,hoc kt ni, s lng nhiu hn mt (tha nhn, mt khi nim hu ch). Ngis dng MIMO a c th c khi qut thnh hai loi: knh pht sng MIMO(MIMO trc Cng nguyn) v nhiu knh MIMO truy cp (MIMO MAC) chong xung v ng ln cc tnh hung tng ng. Ngi s dng MIMOn c th c biu din nh-to-point, MIMO cp im.


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loi b s m h ca cc t thu vpht, chng ta c th p dng cc iukhon i

m truy cp (AP, hoc, c s tr m ), v ngi dng. AP An l mt

ngi s dng my pht v l ngi nhn cho cc mi trng ng xung,trong khi AP mt l ngi nhn v ngi s dng mt my pht cho cc mi

trng uplink. mng ng nht l phn no thot khi s phn bit ny.[sa ]phn chia khng gian truy cp nhiuSpace-Division Multiple Access (SDMA) cho php to ra cc khng gian ngsong songbn cnh ng ng cng su

t cao hn thng qua ghp knh khng

gian v / ho c a d ng, do n c th cung cp hiu sut cao trong nhiu h

thng truy cp v tuyn truyn thng. Trong truyn thng in thoi ding mng di ng h thng, cc trm c s khng c thng tin v v tr ca ccn v in thoi di ng bn trong t bo v pht ra cc tn hiu trong tt c cc

hng dn bn trong t bo cung cp vng ph sng pht thanh. iu nydn n lng ph in nng trn truyn khi khng c n v c ng tc, ngoi vic gy nhiu cho cc t bo ln cn bng cch s dng cng mttn s, nh vy gi l ng knh t bo. Tng t nh vy, trong vic tip nhn,cc ng-ten nhn c tn hiu n t mi hng v nhiu tn hiu bao gm cting n. Bng cch s dng ng ten thng minh cng ngh v bng cch tndng cc v tr khng gian ca cc n v in thoi di ng trong t bo, cc kthut phn chia khng gian cung cp truy cp nhiu ci tin hiu sut hpdn. Cc m hnh bc x ca cc trm c s, c trong truyn ti v tip nhn, l

ph hp vi mi ngi dng c c tng cao nht trong ch o ca ngidng. iu ny thng c thc hin bng cch s dng mng tng giaion k thut.Trong cc mng di ng GSM, cc trm c s nhn thc c v tr ca inthoi di ng bng cch s dng mt k thut gi l Timing Advance (TA). Ccc s Trm thu pht (BTS) c th xc nh cch xa cc trm di ng (MS) l dogii thch TA bo co. Nhng thng tin ny, cng vi cc thng s khc, sau c th c s dng in xung cc trm BTS hoc MS, nu mt tnh nng

iu khin cng sut c thc hin trong mng. Vic kim sot quyn lc tronghoc BTS hoc MS c thc hin trong hu ht cc mng hin i, c bit ltrn cc MS, v iu ny m bo tui th pin tt hn cho cc MS v do ngi dng mt tri nghim tt hn (trong cn phi sc pin tr nn t thngxuyn). y l l do ti sao n thc s c th c an ton hn c mt trmBTS gn vi bn nh l MS ca bn s c h tr xung cng nhiu cngtt. V d, c nhiu nng lng c truyn t MS hn nhng g bn s nhn


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c t cc trm BTS ngay c khi bn l 6 m i t mt ct bum. Tuy nhin,c tnh c th khng xem xt tt c cc ca MS l mt BTS c bit l h trvi EM bc x ti bt k thi im no.[sa ]Nhiu ng-ten

Bi chi tit: Nhi

u ng-ten

Xem thm: Nhiu nhn

Nhiu ng ten l mt k thut anten thng minh, m vt qua nhng gii hnthc hin k thut MIMO duy nht ca ngi dng. Trong truyn thng di ng,s lng ca ng-ten c coi l ti a cho ng xung l 2 v 4 h trLTE v yu cu ca IMT-A, tng ng. K t khi ban nhc ph c th s b hnch trong khi yu cu tc d liu s tip tc tng vt qu IMT-A h trcc dch v a phng tin di ng, n rt c th s lng cc ng-ten truyn ti

cc trm c s phi c tng ln n 8 ~ 64 hoc nhiu hn. Vic ci tnhiu anten ti cc trm c s duy nht c th c nhiu thch thc do , n ihi phi pht trin mt s cng ngh cao: mi SDMA, thut ton beamformingmi v mng ng ten mi.New SDMA: MU-MIMO, Network MIMO (COMP), txa cc thit b pht thanh New beamforming: tuyn tnh beamforming nh MF,ZF v MMSE v beamforming nh Tn Hip Pht, Ph ch tch, v UBND huynng-ten mng New phi tuyn: ng-ten mng trc tip, t xa v khng dy ng-ten trc tip mng: tuyn tnh v 3ngy mng pha, mng cu trc mi, v ng-

ten mng ng t xa v mng khng dy ng ten: ng-ten mng phn phi vhp tc x beamforming[sa ]Cc v cui Hop u tin: n v i t ngi dng mt ng ten a vngi s dng nhiu hp tc

[sa ]MIMO pht sng (MIMO BC)


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cnh tranh da trn truyn dn da trn hp tc v tip nhn. Hp tc truynthng khng dy thc s c th khai thc s can thip, bao gm cc can thip

v can thip ca ngi dng t khc. Trong khng dy thng tin lin lc hp tcx, mi nt c th s dng t can thip v can thip ca ngi dng khc ci

thin hiu sut ca m ha d liu v gii m, trong khi cc nt thng thngni chung l hng trnh s can thip. V d, mt ln can thip mnh m ldecodable, mt gii m nt ny v hy b s can thip mnh m trc khi giim cc tn hiu t. Cc nh cung cp gim nh thp hn can thip (COI) t l cth c thc hin trn PHY / MAC / lp mng ng dng trong cc h thnghp tc x.

Hp tc nghin cu nhiu ng-ten - p dng cng ngh ng ten nhiu trongcc tnh hung vi ng-ten phn phi thit b u cui khng dy gia cc

nc lng ging. Hp tc x a dng - t c tnh a dng ng-ten thu c bi s hp

tc ca anten phn phi thuc vi mi nt c lp. Hp tc x MIMO - t c MIMO li th, bao gm s tng ghp knh

khng gian, bng cch s dng truyn ti hoc nhn hp tc ca antenphn phi thuc cc nt khc nhau nhiu.

Hp tc x chuyn tip - p dng cc khi nim hp tc x chuyn tip vocc k thut, m l tng t nh hp tc a dng v tn hiu hp tc x. Tuy

nhin, cc ch tiu chnh ca hp tc x chuyn tip l ci thin s cn bnggia cc khu vc chm tr v hiu qu, trong khi s a dng hp tc xv MIMO l ci thin hiu sut h thng lin kt v ti cc chi ph thit hihp tc ti thiu.

Tip nhn k thut cho hp tc

Lu tr v chuyn tip (S & F), phng i v chuyn tip (A & F), Gii mv chuyn tip (D & F), m ha hp tc, khng gian hp tc c m ha,Nn v chuyn tip (C & F), khng trc giao phng php

[sa ]Hp tc x MIMO (CO-MIMO)CO-MIMO, cn c gi l mng MIMO ( Net-MIMO ), hoc Ad-hoc MIMO , s

dng anten phn phi thuc cho ngi dng khc, trong khi MIMO thngthng, ngha l ngi s dng MIMO duy nht, ch s dng anten thuc ccthit b u cui ti a phng. CO-MIMO ci thin hiu sut ca mt mngkhng dy bng vic gii thiu nhiu li th ng-ten, chng hn nh s a dng,


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ghp knh v beamforming. Nu cc bn l quan tm chnh trn t c s adng, n c gi l s a dng hp tc x . N c th c m t nh l mthnh thc a dng v m , s dng v d nh trong giao mm . Hp tc x MISOtng ng vi s a dng pht v m hoc simulcasting . Mt hnh thc n

gin m khng cn bt k x l tn hiu tin tin l mng n tn s (SFN), cs dng c bit l trong broadcasing khng dy.SFNs kt hp vi thch ngknh hoc giao thng lp k hoch thch ng c gi l nng ng, mng litn s duy nht (DSFN).CO-MIMO l mt k thut hu ch cho mng di ng trong tng lai m xemxt mng li khng dy hoc mng khng dy ad-hoc. Trong khng dy -hoccc mng qung co , nhiu truyn cc nt giao tip vi nhn nhiu nt. tiu ha nng lc ca cc-hoc cc knh qung co, khi nim MIMO v k thut

c th c p dng cho nhiu lin kt gia truyn v nhn cc cm nt. i lpvi nhiu ng-ten trong mt ngi s dng thu pht MIMO-n, cc nt thamgia v ng-ten ca h c t trong mt cch thc phn phi. V vy, tc nng lc ca mng li ny, cc k thut qun l ngun ti nguyn vtuyn in phn phi l rt cn thit. Chin lc nh nhn thc can thip t tr ,hp tc nt, v mng li m ha vi giy bn m ha (UBND huyn) c xut nh l gii php ti u ha nng lc mng li khng dy.

Analogical quan tm y c th l so snh gia s tin ha ca nhn tnh tonv ng-ten in thoi di ng. c bit, mt n li hiu sut cao l th h u

tin ca s tin ha li CPU, tin trin n mt vi li, v sau nhiu li mtcch tp trung nh l bc th hai - mi trng gn y. D kin n s cph bin cho cc hp tc x lm vic tin hnh t nhiu li thuc s hu cangi dng khc nhau, sn sng cho ngi dng c nhn i ly tr gip xl thng tin ca ngi khc. nhng cu khu hiu ny bao gm thng tin tnhbo mi trng xung quanh , my tnh ph bin khng dy , v cc web ngngha .

56318399 tong quan ve mimo wiki

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