BC full - NVQ - 3.8

Bo co thc tp tt nghipGing vin hng dn ThS Nguyn Vit Minh ThS Phm Th Thy Hin ThS L Tng Hoa KS Nguyn Trung Hin Nguyn Vn Qu D07VT3

Sinh vin thc hin Lp

H Ni, thng 08 - 2011

Bo co thc tp tt nghip 2011

MC LCMC LC ............................................................................................................................................................... LI NI U .....................................................................................................................................................II DANH SCH THUT NG VIT TT ........................................................................................................ III DANH SCH HNH V ................................................................................................................................... IV DANH SCH BNG BIU ................................................................................................................................ V PHIU NHN XT NH GI THC TP TT NGHIP...................................................................... VI NH GI KT QU THC TP TT NGHIP ..................................................................................... VII CHNG I: GII THIU N V THC TP .............................................................................................8 1.1. V TR CHC NNG ......................................................................................................................................8 1.2. T CHC .....................................................................................................................................................9 1.3. CC LNH VC HOT NG .........................................................................................................................9 CHNG II: NI DUNG THC TP C S .............................................................................................. 10 2.1. TNG QUAN V HSDPA ............................................................................................................................ 10 2.2. CU TRC HSDPA.................................................................................................................................... 11 2.2.1. M hnh giao thc HSDPA ............................................................................................................... 11 2.2.2. Cu trc knh ................................................................................................................................... 12 2.3. CC K THUT S DNG TRONG HSDPA ................................................................................................. 12 2.3.1. iu ch v m ho thch ng .......................................................................................................... 12 2.3.2. K thut HARQ ................................................................................................................................ 13 2.3.3. Lp biu ph thuc knh .................................................................................................................. 14 CHNG III: NI DUNG THC TP CHUYN SU ............................................................................... 15 3.1. THIT B O DI NG AGILENT 8922M/S GSM TEST SET ......................................................................... 15 3.1.1. Gii thiu ......................................................................................................................................... 15 3.1.2. Cc bi o ........................................................................................................................................ 15 3.2. H THNG SDH DMR 3000S .................................................................................................................... 19 3.2.1. Tng qut ......................................................................................................................................... 20 3.2.2. M t hot ng ............................................................................................................................... 28 3.3. THIT B VI BA S SDH RMD 904 .......................................................................................................... 30 3.3.1 Gii thiu chung ................................................................................................................................ 30 3.3.2. Ch tiu k thut ca h thng RMD 904 ......................................................................................... 31 3.3.3 My pht RMD 904 ........................................................................................................................... 32 3.3.4. My thu RMD 904 ............................................................................................................................ 34 3.3.5. Cc phng php u ni thit b .................................................................................................... 37 3.3.6. Cnh bo .......................................................................................................................................... 37 KT LUN ......................................................................................................................................................... 39

Nguyn Vn Qu D07VT3 - PTIT

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LI NI Uc s phn cng, sp xp ca Hc vin, trong sut t thc tp tt nghip va qua em c tham gia lm vic ti Trung tm Vin thng huyn Lc Nam tnh Bc Giang. Tuy thi gian thc tp khng di nhng em hc hi c rt nhiu kinh nghim trong qu trnh lm vic thc t ti Trung tm. Ti y, em c tham gia vo cc cng vic thc t ca cc cn b, hc hi c nhiu iu b ch, rt ra c nhng bi hc kinh nghim cho bn thn. iu chc chn s gip ch cho em rt nhiu trong cng vic sau ny. Qua y, em xin gi li cm n su sc n Ban Gim c Hc vin Cng ngh Bu chnh Vin thng, Trung tm Vin thng huyn Lc Nam to iu kin cho em c c thi gian thc tp v cng qu bu. Em xin gi li cm n chn thnh n ch Nguyn c Cng Trng Trung tm, ngi trc tip hng dn em trong t thc tp va qua. Em xin gi li cm n su sc n cc thy cc c trong b mn V tuyn: ThS Nguyn Vit Minh, ThS Phm Th Thy Hin, ThS L Tng Hoa, v KS Nguyn Trung Hin - Ging vin b mn Mng vin thng trc tip hng dn thc tp em bn pha Hc vin. Cm n cc thy, cc c rt nhit tnh, trch nhim, gip em rt nhiu trong thi gian va qua. Trong qu trnh thc tp, chc chn khng th trnh khi nhng thiu st trong cng vic do cha c nhiu k nng lm vic thc t, em mong cc thy c, cc c ch cn b b qua v ch bo em ngy cng hon thin hn, trang b nhng k nng cn thit v cng vic trong tng lai. Em xin chn thnh cm n!


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DANH SCH THUT NG VIT TT

T vit tt AMC ARQ BLER CC CQI HARQ HSDPA

Thut ng ting Anh Adaptive Modulation and Coding Automatic Repeat Requetst Block Error Rate Chase Combining Channel Quality Indicator

Thut ng ting Vit iu ch v m ha thch ng Yu cu pht li t ng T l li khi Kt hp theo ui Ch s cht lng knh Truy cp gi ng xung tc cao Knh chia s ng xung tc cao Tng d iu ch bin cu phng Trm iu khin v tuyn T l tn hiu trn nhiu Khong thi gian an xen truyn dn Thit b ngi dng Tp on Bu chnh Vin thng Vit Nam a truy nhp phn chia theo m bng rng

Hybrid Automatic Repeat Request Yu cu pht li t ng li ghp High-Speed Downlink Packet Access High Speed Downlink Shared Channel Incremental Redundancy Quadrature Amplitude Modulation Radio Network Controller Signal to Inteference Ratio Time Transfer Interval User Equipment Vietnam Posts and Telecommunications Group Wideband Code Division Multiple Access

HS-DSCH IR QAM RNC SIR TTI UE VNPT

WCDMA


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DANH SCH HNH V

Hnh 2.1: Kin trc giao din v tuyn ca knh truyn ti HS-DSCH ...................... 11 Hnh 2.2: Giao din v tuyn ca HSDPA ................................................................. 12 Hnh 2.3: Nguyn l tng qut HARQ ti NodeB ....................................................... 13 Hnh 2.4: Lp biu ph thuc knh cho HSDPA ......................................................... 14 Hnh 3.1: Ph RF u ra............................................................................................... 17 Hnh 3.2: Sn ln ca xung........................................................................................ 17 Hnh 3.3: Sn xung ca xung .................................................................................. 18 Hnh 3.4: Phn tch ph tn hiu .................................................................................. 19 Hnh 3.5: Cu hnh thit b ca h thng 3+1 .............................................................. 21 Hnh 3.6: S khi thit b cu hnh N+1 FD/SD ti trm u cui ........................ 22 Hnh 3.7: S khi h thng thit b cu hnh N+1 FD/SD ti trm lp .................. 23 Hnh 3.8: S khi cu hnh h thng 3000S SDH DMR ti phng thc hnh ....... 27 Hnh 3.9: Phn b tn s theo khuyn ngh F.384-6.................................................... 28 Hnh 3.10: S khi thit b thu pht RMD 904 ....................................................... 30 Hnh 3.11: S khi my pht RMD 904 ................................................................. 32 Hnh 3.12: S khi my thu RMD 904 ................................................................... 35


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DANH SCH BNG BIUBng 3.1: Single burst .................................................................................................. 15 Bng 3.2: Phase Error View ......................................................................................... 16 Bng 3.3: Cu hnh h thng 3000S ............................................................................ 20 Bng 3.4: Cc c tnh k thut ca h thng 3000S .................................................. 23


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PHIU NHN XT NH GI THC TP TT NGHIP


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NH GI KT QU THC TP TT NGHIP


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CHNG I: GII THIU N V THC TPc s phn cng ca Hc vin, em c phn cng thc tp ti Trung tm Vin thng huyn Lc Nam tnh Bc Giang. Trung tm Vin thng Lc Nam trc thuc Vin thng Bc Giang. 1.1. V tr chc nng VNPT Bc Giang l mt thnh vin trong i gia nh VNPT, t ho c truyn ti v thc hin nhng gi tr lch s ct li, trit l kinh doanh ca VNPT: Trit l kinh doanh th hin c ng trong 10 ch vng truyn thng: "Trung thnh, Dng cm, Tn ty, Sng to, Ngha tnh" K t ngy 1/1/2008, Vin thng Bc Giang chnh thc c thnh lp v bt u i vo hot ng c lp. Vin Thng Bc Giang, l n v kinh t trc thuc, hch ton ph thuc Tp on Bu chnh Vin thng Vit Nam; C chc nng hot ng sn xut kinh doanh v phc v chuyn ngnh vin thng cng ngh thng tin nh sau: T chc, xy dng, qun l, vn hnh, lp t, khai thc, bo dng, sa cha mng vin thng trn a bn ton tnh; T chc, xy dng, qun l, vn hnh, lp t, khai thc, bo dng, sa cha mng vin thng trn a bn ton tnh; Sn xut, kinh doanh, cung ng, i l vt t, thit b vin thng Cng ngh thng tin theo yu cu sn xut kinh doanh ca n v v nhu cu ca khch hng; Kho st, t vn, lp t, bo dng cc cng trnh vin thng cng ngh thng tin; Kinh doanh bt ng sn, cho thu vn phng; Kinh doanh bt ng sn, cho thu vn phng; T chc phc v thng tin t xut theo yu cu ca cp y ng, chnh quyn a phng v cp trn; Kinh doanh cc ngnh ngh khc khi c Tp on cho php. Ha nhp vi s pht trin i ln ca t nc, di s lnh o trc tip ca Tnh y, y ban nhn dn tnh, thc hin chin lc tng tc ca ngnh, vi t tng ch o ca lnh o ngnh Vin thng tnh l on kt, i mi i ln, nm bt thi c, khai thc pht huy mi ngun lc, ni lc; tranh th s hp tc gip ca trung ng v ng nghip, i tt n u, tin vo cng nghip hin i.


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1.2. T chc

1.3. Cc lnh vc hot ng T chc xy dng, qun l, vn hnh, lp t, khai thc, bo dng, sa cha mng Vin thng trn a bn tnh Bc Giang. T chc, qun l, kinh doanh v cung cp cc dch v Vin thng - Cng ngh Thng tin trn a bn tnh Bc Giang. Sn xut, kinh doanh, cung ng, i l vt t, thit b Vin thng - Cng ngh Thng tin theo yu cu sn xut kinh doanh ca n v v nhu cu ca khch hng. Kho st, t vn, thit k, lp t, bo dng cc cng trnh Vin thng - Cng ngh Thng tin. Kinh doanh dch v qung co, dch v truyn thng. T chc phc v thng tin t xut theo yu cu ca cp y ng, Chnh quyn a phng v cp trn. Kinh doanh cc nghnh ngh khc trong phm vi c Tp on Bu chnh Vin thng Vit Nam cho php v ph hp vi quy nh ca php lut.


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CHNG II: NI DUNG THC TP C S2.1. Tng quan v HSDPA Mc d cng ngh 3G WCDMA cho php tc d liu gi ln n 2Mbps. Tuy nhin, cc tiu chun thit k h thng WCDMA c mt s hn ch nh: Khng tn dng cc u th ca d liu gi vn rt ph bin i vi ng trc hu tuyn Thit k dch v 2Mbps hin nay l khng hiu qu v cng cha p ng c nhu cu s dng dch v s liu Khng th x l tc d liu cao ln n 10Mbps Do , R5 tip tc c pht trin khc phc nhng hn ch ny. R5 l s pht trin quan trng ca mng v tuyn 3G k t khi WCDMA c chp nhn l cng ngh mng v tuyn 3G t nm 1997 vi cc tnh nng k thut ca cng ngh HSDPA gm: Tng ng vi CDMA2000 1xEV iu ch v m ho thch ng Sng mang tc d liu cao trong bng tn 5MHz 64 QAM h tr tc nh tng ng 7.2 Mbps M Turbo Kh nng sa li gn vi gii hn l thuyt ARQ ghp thch ng T ng thch ng lin tc theo iu kin knh bng cch ghp chn thm thng tin khi cn S dng AMC khi c kt hp vi HARQ nhm ci thin dung lng ca h thng Cc k thut c s dng cho php HSDPA h tr tc 10 Mbps Trong mt h thng d liu v thoi c tch hp vi ngi s dng thoi (12.2 Kbps) ti khong 30 Erl/sector v thng lng sector ca d liu khong 1 Mbps. HSDPA gm cc gii php: Thc hin an xen thi gian truyn dn ngn TTI = 2ms M ho v iu ch thch ng AMC Truyn dn a m, lp vt l tc cao L1 Yu cu lp t ng lai ghp HARQ.10



2.2. Cu trc HSDPA 2.2.1. M hnh giao thc HSDPA

Hnh 2.1: Kin trc giao din v tuyn ca knh truyn ti HS-DSCH Trong cu trc HSDPA, thit b sp xp gi tin s c chuyn t b iu khin mng v tuyn RNC ti NodeB nhm gip ngi s dng d dng truy nhp vo cc chc nng thng k giao din v tuyn. K thut sp xp gi tin tin tin s gip iu chnh c tc d liu ngi s dng sao cho thch hp vi cc iu kin knh v tuyn tc thi. Nu nh tt c cc knh truyn ti theo kin trc R99, chng u chm dt ti RNC th knh HS-DSCH li chm dt ti NodeB nhm mc ch iu khin knh HSDSCH, lp MAC-hs (lp iu khin truy cp trung gian tc cao), s iu khin cc ti nguyn ca knh ny v nm ngay ti NodeB. Do , cho php nhn cc bn tin v cht lng knh hin thi c th tip tc theo di gim st cht lng knh hin thi c th lin tc theo di gim st cht lng tn hiu cho thu bao tc thp. V tr ny ca MAC-hs ti NodeB cng cho php kch hot giao thc HARQ t lp vt l, n gip cho cc qu trnh pht li din ra nhanh hn. Lp MAC-hs cng lu gi d liu ca user c pht qua giao din v tuyn, iu to ra mt s thch thc i vi vic ti u ha dung lng b nh m ca NodeB. Trong qu trnh kt ni, thit b ngi s dng (UE) s nh k gi mt ch th cht lng knh CQI ti NodeB cho bit tc d liu no (bao gm k thut iu ch v m ho, s lng cc m s dng) m thit b ny c th h tr khi di cc iu kin v tuyn hin thi. ng thi, UE gi mt bo nhn (Ack/Nack) ng vi mi gi gip NodeB bit c thi im lp li qu trnh truyn d liu. Cng vi chc nngNguyn Vn Qu D07VT3 - PTIT

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thng k cht lng knh tng ng cho tng UE trong mt cell, thit b sp xp gi tin s thc hin sp xp cc gi ca cc UE mt cch cng bng. 2.2.2. Cu trc knh

Hnh 2.2: Giao din v tuyn ca HSDPA Ti nguyn chung ca ngi s dng trong t bo bao gm cc b m knh v cng sut pht. Khi nim HSDPA c gii thiu bao gm mt s knh vt l thm vo: Knh vt l chia s ng xung tc cao HS-PDSCH (High Speed Physical Downlink Shared Channel) Knh chia s ng xung tc cao HS-DSCH (HS-Downlink Shared Channel) Knh iu khin chia s tc cao HS-SCCH (HS-Shared Control Channel) Knh iu khin vt l tc cao HS-DPCCH (High Speed Physical Control Channel). 2.3. Cc k thut s dng trong HSDPA 2.3.1. iu ch v m ho thch ng Vi AMC, t l m ha v phng n iu ch cho mi ngi dung c t ng iu chnh da trn cc iu kin trung bnh ca cc lin kt v tuyn. Vic thch ng lien kt c thc hin bng cch ch nh mt phng n iu ch khc hoc tc


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m ha cho tng ngi s dng da trn cc iu kin knh c bo co nh k bi cc u cui nhng v c bn khng lm thay i nng lng knh. Trong HSDPA, NodeB s xc nh tc truyn dn d liu da trn cc bo co v ch th cht lng knh CQI cng nh cc thng k cng sut trn cc knh dnh ring. Tc d liu c iu chnh bng cch thay i s iu ch, tc m ho cng nh s lng m ho knh HS-PDSCH. S dng iu ch thch ng v m ho AMC cho php ngi s dng tin gn hn ti NodeB, c th yu cu iu ch vi t l m ho cao hn (chng hn nh iu ch 16QAM vi t l m ho 3/4). 2.3.2. K thut HARQ HARQ ci thin thng lng bng cch kt hp vic truyn b li vi c gng truyn li, thc s to ra mt chng trnh sa li mnh hn.HARQ c th c kt hp vi iu ch v m ho thch ng(AMC), lm cho vic la chn ban u ca iu ch v m ha t li hn. HSDPA nh ngha hai phng php HARQ khc nhau: kt hp theo ui (CC v tng d (IR s c la chn da trn cc loi UE v cu hnh mng. Vi kt hp theo ui, d liu truyn li trng vi d liu ban u, trong khi vi tng d, mi qu trnh pht li cung cp cc bit m mi t m gc xy dng m c tc thp hn.6. RLC ACK

RNC 1. Gi n b m nt B Nt B 2. Pht ln u

4. Pht li

3. NACK

5. Kt hp pht li

u cui

Hnh 2.3: Nguyn l tng qut HARQ ti NodeBNguyn Vn Qu D07VT3 - PTIT

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C nhng u im v nhc im trong c 2 thut ton. Kt hp theo ui l lm cho AMC mnh m hn v tiu th b nh m t hn trong khi tng d cung cp kh nng hot ng tt hn vi tc m cao ban u vi chi ph b nh b sung gii m phc tp thit b cm tay. HSDPA s dng giao thc HARQ da vo phng n N knh Dng v ch (Stop And Wait). Trong c ch SAW, pha truyn dn lun lun qu trnh truyn dn cc block ang hin hnh cho ti khi thit b ngi s dng hon ton nhn c d liu. tn dng thi gian khi NodeB ch cc bo nhn, c th thit lp N tin trnh SAW-ARQ song song cho thit b ngi dng. Do , cc tin trnh khc nhau truyn dn trong cc TTI ring bit. S tin trnh SAW-ARQ song song c thit lp ti a l 8 (N=8 , tuy nhin thng thng chn gi tr N t 4-6. 2.3.3. Lp biu ph thuc knh Lp biu ngi s dng theo cc iu kin ng truyn v tuyn tc thi tt nht thng c gi l lp biu t s tn hiu trn nhiu cc i (max-C/I) hay tc cc i. V trong mt , cc iu kin ca cc ng truyn v tuyn khc nhau thng thay i c lp, ti mi thi im hu nh lun c mt ng truyn v tuyn vi cht lng gn nh cc i (hnh 5.2). V th knh c s dng cho truyn dn s c cht lng cao nht v vi iu khin tc , tc s liu cao nht c th c s dng. iu ny dn n dung lng h thng cao.

Hnh 2.4: Lp biu ph thuc knh cho HSDPA


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CHNG III: NI DUNG THC TP CHUYN SU3.1. Thit b o di ng Agilent 8922M/S GSM Test Set 3.1.1. Gii thiu Agilent 8922M/S l thit b th nghim di ng dng o kim cc thng s k thut ca my di ng. My c 3 ch hot ng l ACTIVE CELL, TEST MODE v CW GENERATOR. Cc bi o c trnh by trong bo co ny s ch thc hin ch ACTIVE CELL (ACTIVE CELL l ch mc nh ca my. Trong ch ny, 8922M/S ng vai tr l mt b m phng BTS. N c th o c cc thng s k thut ca my di ng thng qua vic thit lp cc cuc gi ti my di ng hoc ngc li t my di ng ti 8922M/S). 3.1.2. Cc bi o 3.1.2.1. o cc thng s tn hiu ca MS h thng GSM Bc 1: Chn ch ACTIVE CELL; lc ny my o Agilent 8922 lm vic nh mt trm gc BTS trong GSM. Bc 2: Thit lp cuc gi. Thc hin cuc gi t MS ti Agilent 8922 hoc ngc li. Thay i knh, khe thi gian, mc pht. Cc s liu bo co ca MS hin th vng Call Status: Cng sut pht ca MS (Tx Lev) Mc thu ti MS (Rx Lev) Cht lng tn hiu thu ti MS (Rx Qual) Bc 3: o cc thng s a) o li tn s v li pha Chn Phase FRQ trn phn Measurements t mn hnh iu khin. Kt qu thu c nh sau: Bng 3.1: Single burst Tx Phase error RMS 0.97 deg 50


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Tx Phase error Peak Tx Frequency error

3.32 -23.60

deg Hz

200 90 Hz

Cc gi tr v li pha RMS, li pha nh v li tn s th hin trong bng u nm trong gii hn o cho php. Bng gi tr o tip theo l v li pha chi tit: Bng 3.2: Phase Error View Phase Error bit Phase Error at 55 Phase Error at 95 Phase bit ...125 0.74 -2.74 1.58 0.37 deg deg deg deg 200 200 200 200

Cc gi tr o th hin li pha theo cc bt s liu. Chng ta c th thy c rng gi tr v li pha trong phn thc nghim tng i nh chng t php o kh chnh xc. b) o v v dng tn hiu PWR Ramp: Chn PWR Ramp trn phn Measurements ca mn hnh iu khin. Sau vo phn View chn cc cc trng cn quan st. c) o t l li bt Chn Bit Error trn phn Measurements t mn hnh iu khin. 3.1.2.2. o ph tn hiu RF ca MS Bc 1 v bc 2 thc hin tng t trn. Bc 3: Chn trng OUT RF SP t mn hnh iu khin Cell. Mc cng sut nh thu c l P= 12.93 dBm. y l ph ca xung tn hiu pht ca MS trong khong thi gian mt cm.


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Hnh 3.1: Ph RF u ra Rise Edge

Hnh 3.2: Sn ln ca xung Mn hnh Rise Edge View th hin mc cng sut nh 30dB trong phn sn tng ca dng sng. Thang bin gii hn t -40 n 5 dBm, thang thi gian gii hn t 8 n 4 Tb. Trong phn thc hnh ny, sau khi o c v c c kt qu theo nh sau:Nguyn Vn Qu D07VT3 - PTIT

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Rising Period Level Range Level at -2 Tb

-3.20.2 -40 -0.21 -8.03

Tb dB dB

-8Tb4 Tb -405dB

Khong thi gian tng ca sn ln t t = -3,2Tb n t = 0,2 Tb. Mc cng sut thp nht (-40dB) v cao nht (-0,21dB o c u nm trong gii gii hn. Ti v tr bt trung tm (t = -2Tb o c mc cng sut l -8,03 dB. Top 2dB Mn hnh Top 2dB hin th tn hiu trong khong gia cm, cho php phn tch s gn sng ca tn hiu t -10 n 160 Tb. Gii hn v cng sut o cho php trong khong -1,2 n 1,2 dBm. Kt qu nh sau: Time Range Level Range 5.9104.7 0.19 -0.18 Tb dB -10Tb160 Tb -1.21.2dB

o khong gia cm trong thi gian t 5,9 Tb n 104,7 Tb. Kt qu o c vi gi tr cng sut ln nht v nh nht ln lt l 0,19 dBm v -0,18 dBm. Gi tr o c nm trong di gii hn v sai s tng i nh. Fall Edge

Hnh 3.3: Sn xung ca xungNguyn Vn Qu D07VT3 - PTIT

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Mn hnh Fall Edge hin th mc cng sut tn hiu trong khong thi gian cui ca cm ( sn xung ca xung , cho php xc nh thi gian gim ca tn hiu. Gii hn v thang bin l t -40 dBm n 5 dBm v gii hn v thang thi gian l t 144 n 156 Tb. Sau khi tin hnh o thu c kt qu nh sau: Falling Period Level Range Level at 148 Tb 147150 -40-0.45 -3.76 Tb dB dB 144156Tb -405dB

Sau khi o xc nh khong thi gian gim ca tn hiu t 147 Tb n 150 Tb. Cc mc cng sut ln nht v nh nht o c l -40 dBm v -0,45 dBm nm trong gii hn o. Mc cng sut o c bit trung tm t=148 Tb l 3,76 dBm. Mc cng sut ny so vi v tr trung tm ca sn ln chnh lch = -3,76 (-8,03)= -4,27 dB. Phn tch ph tn hiu Chn trng SPEC ANL trn mn hnh CEL CNT

Hnh 3.4: Phn tch ph tn hiu 3.2. H thng SDH DMR 3000SNguyn Vn Qu D07VT3 - PTIT

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3.2.1. Tng qut 3.2.1.1 Mc ch s dng H thng 3000S SDH DMR c thit k truyn dn ng di module truyn ti ng b cp 1 (STM-1 . Dung lng truyn dn ca h thng l 155.52 Mbps v h thng hot ng cc bng tn 4, 5, 6, 7, 8, 11, 13 GHz, s dng phng php iu ch 64-QAM hoc 128-QAM. 3.2.1.2 Cu hnh h thng 3000S SDH DMR bao gm TRP-[ ]G150MB[ ]-900[ ] Transmitter-Receiver v MDP-150MB[ ]T-900C Modulator-Demodulator. Trm lp ti to li bao gm TRP[ ]G150MB[ ]-900[ ] Transmitter-Receiver v MDP-150MB[ ]R-900C ModulatorDemodulator. Cc chc nng khai thc, qun l, bo dng v ci t (OAM&P) v mt in thoi nghip v c lp t trong khi MDP. Cu hnh h thng ca thit b 3000S SDH DMR c ch ra trong bng 2.3 Bng 3.3: Cu hnh h thng 3000S Loi thit b 3000S SDH MICROWAVE RADIO BR-[*]-3000 TRP-[*]G150MB[*]-900[ ] MDP-150MB[*]T/R-900C Mch phn nhnh RF My pht - my thu Thit b iu ch-gii iu ch Tn thit b

(Ghi ch: * ty thuc vo bng tn hoc h thng iu ch) S khi h thng v s cu hnh thit b u cui v trm lp c trnh by trong cc hnh di y.


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DMR-3000

BR CKT/DUP CKT TX/RX/SD RX

TRP (TX) (RX) (SD RX)




P

R1

R2

R3

EQL BOARD 2 200 mm PIO INTFC NFB BOARD

INTERFACE (IDB)

IRC (OAM &P/ SW)

MDP MDP MDP MDP (INTF) (INTF) (INTF) (INTF) P R1 R2 R3

IRC (DC-DC) (SW) P/R1

MDP (MODEM/XPIC/ CLK) P/R1/R2/R3

MDP (DC-DC) (SW) R2/R3

Chiu su: 300 mm

(OPTION RACK)

Gi my ETSI 600 mm

Hnh 3.5: Cu hnh thit b ca h thng 3+1Nguyn Vn Qu D07VT3 - PTIT

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ng ten chnh

ng ten phn tp khng gian

BR CKT DUP CKT

BR CKT

TRP

TRP

DSC* WS* Cnh bo DCCm (D4 n D12) E1/E2 NMS Q LCT F OW

MDP

MDP

Tn hiu STM-1 (knh d phng)* Tn hiu STM-1 (knh lm vic 1) Tn hiu STM-1 (knh lm vic 2) Tn hiu STM-1 (knh lm vic 3)

Tn hiu STM-1 (knh lm vic N-1) Tn hiu STM-1 (knh lm vic N)

Hnh 3.6: S khi thit b cu hnh N+1 FD/SD ti trm u cuiNguyn Vn Qu D07VT3 - PTIT

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ng ten chnh

ng ten chnh



BR CKT DUP CKT

BR CKT

BR CKT

BR CKT DUP CKT

TRP

TRP

TRP

TRP

DSC* WS* Cnh bo DCCr (D1 n D3) E1 NMS Q LCT F OW

MDP

MDP

MDP

MDP

Hnh 3.7: S khi h thng thit b cu hnh N+1 FD/SD ti trm lp 3.2.1.3 Cc c tnh k thut Bng 3.4: Cc c tnh k thut ca h thng 3000S Mc Quy hoch tn s Khong cch knh tn s Cng sut pht* (khng tnh suy hao mch phnNguyn Vn Qu D07VT3 - PTIT

Cc c tnh ITU-RF.384-6 40 MHz

23


nhnh) (5W) (10W) C/N (dB) theo BER 10-3 10-6 RSL qu ti (khng tnh suy hao mch phn nhnh) RSL (dBm)theo BER (khng tnh suy hao BR CKT) 10-3 10-6 H s khuch i h thng (khng tnh suy hao BR CKT) (5W) 10-3 10-6

30 dBm 1 dB 33 dBm 1 dB

21,5+1,0 dB 23+2,0 dB -12-5dB

-76,1+2 dB -74,6+3 dB

106,1-2 dB 104,6-3 dB URD -70

Giao din ng dn sng *ATPC Di ng Bc iu khin Tc bm phading

-12 ti +2 dB 1 dB 100 dB/s

*thit b MDP Phng php iu ch H thng gii iu ch Tn s trung tn 64 QAM Tch sng nht qun 140 MHz24



*OAM&P Khun dng giao thc Giao din ni tip vi LCT Qecc/Q3 RS232C hoc 10 BASE-T 155,52 Mbps 1 Vp-p (danh nh) CMI 75 khng cn bng

*Giao din STM-1 Tc bit Mc Dng m Tr khng

*Truyn dn knh b sung (Wayside) Tc bit Mc vo/ra danh nh Dng m Tr khng (danh nh)

2 x 2,048 Mbps 50 ppm 2,37 Vp-p HDB-3 75 khng cn bng

DCCr (D1-D3) (trn MDP) Tc bit Mc vo/ra Tr khng 192 kbps 2 Vp-p (TTL) 100 cn bng

DCCm (D4-D12) (trn MDP) Tc bit Mc vo/ra Tr khng 276 kbps cho mi knh 2 Vp-p (danh nh) 110 cn bng

E1, E2 (trn MDP, cho OW qung b v nhanh), F1 (trn MDP cho knh ngi iu hnh) Tc bit Mc vo/ra 64 kbps cho mi knh E1, E2 v F125



Tr khng

2 Vp-p (danh nh) 110 cn bng

u vo xung nhp chun Tn s/tc bit Mc vo 2 MHz Tr khng Dng m

2,048 MHz hoc 2,048 Mbps 0,75 ti 1,5 Vo-p 75 khng cn bng HDB-3

Giao din song song cho iu khin/cnh bo trm Cc loi u vo Giao din u vo Cc loi u ra 16 i t thu quang (2 chn) 8 4 dy 0,3 n 3,4 kHz -6 dBm 600 , cn bng -48 V DC (-36 n -72 V DC) Xp x 315 W i vi thit b d phng nng 1+1 -5 n 50C

Knh nghip v nhanh m tn v knh nghip v qung b ng dy Bng tn Mc danh nh Tr khng

Cc c tnh chung Ngun nui Cng sut tiu th

Nhit lm vic

3.2.1.4 H thng ti phng thc hnh Viba s H thng hot ng na cao bng tn 6 GHz theo khuyn ngh F.384-6, s dng phng php iu ch 64 QAM, d phng kp. S khi h thng ti phng thc hnh (hnh 3.8)Nguyn Vn Qu D07VT3 - PTIT

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TR DIST

TRX

TRX

REP-A RF Coaxial Cable

TRXTX RF FET AMP

TR DIST

TX SW

RX RF TX RF FET AMP

RX IF

MODEM

FET AMP

TX RF

TX SW

ATT

ATT

BR CKT

BR CKT

MODEM DIST RX IF RX RF

MODEM ATT RX RF RX IF DIST

TRX

RX RF

RX IF

MODEM

TX RF

FET AMP

HYB SD RX RF

ATT

BR CKT

BR CKT

TRX TRXDATA IN TX RF FET AMP

TRXDATA IN FET AMP TX RF

REP-B

FET AMP

TX RF

MODEM

RX IF

RX RF

150M INTFC

RF Coaxial Cable

ATT

MODEM RX IF RX RF

MODEM SD RX RF ATT RX RF RX IF

150M INTFC

ATT BR CKT BR CKT

TRX

HYB SD RX RF DATA OUT

DATA OUT

FET AMP

TX RF

MODEM

RX IF

RX RF

ATT

LMS

Each Block LMS Each Block

SD RX RF

Each Block

LMS

LCT

TERMINAL - 1LCT

REPEATER

TERMINAL - 2LCT

Hnh 3.8: S khi cu hnh h thng 3000S SDH DMR ti phng thc hnhNguyn Vn Qu D07VT3 - PTIT

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Phn b tn s:340 MHz fs 40 MHz

CH1 6460

CH2 6500

CH3 6540

CH4 6580

CH5 6620

CH6 6660

CH7 6700

CH8 6740 6770

CH1' 6800

CH2' 6840

CH3' 6880

CH4' 6920

CH5' 6960

CH6' 7000

CH7' 7040

CH8' 7080

Hnh 3.9: Phn b tn s theo khuyn ngh F.384-6 Cc cnh bo h thng: NORM (xanh : n ny sng khi h thng hot ng bnh thng. PM ()-Prompt Maintenance: n sng l cnh bo khn, yu cu khc phc s c ngay. DM ()-Deferred Maintenance: n sng l cnh bo khng khn, yu cu khc phc s c trnh cc li nghim trng hn. MAINT (vng : n sng bo hiu hin ang c hot ng bo dng hay x l nhn cng trn thit b. 3.2.2. M t hot ng 3.2.2.1 Phn pht (a) Phn chia tn hiu lng cc qua 150M UNIT SW (ty chn) UNIT SW cung cp cho cu hnh d phng. Tn hiu d liu bng gc n t thit b ghp knh bn ngoi c a vo module UNIT SW cha mt mch lai ghp trn ng truyn dn v chia tn hiu vo thnh 2 v dn ti hai module 150M INTFC. (b) OPT INTFC trong MSP (ty chn) C 2 tn hiu t 2 u ra ca module OPT INTFC c chn module TR DIST v MODEM bi tn hiu iu khin to ra vi module BB SW CTRL. (c) Tn hiu STM-1 v C4 Tn hiu d liu chnh trn mi knh c a t thit b ghp knh ti module ()INTFC trong mt lung STM-1 155.52 Mbit/s in, STM-1 155.52 Mbit/s quangNguyn Vn Qu D07VT3 - PTIT

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hoc lung d liu C4 139.264 Mbit/s. Cc module 150 INTFC, OPT INTFC v 140M INTFC cung cp cho giao din tn hiu vo/ra ny. Phn truyn dn vi mi module ()INTFC p dng cho cc chc nng di y: Chuyn i m v khi phc ng h ng b khung F SYNC Ngu nhin ha DESCRAMBLING X l MSOH/RSOH/PTR/POH (d) Chuyn mch TX TX Switch ca module TR DIST thc hin chuyn mch tn hiu truyn t knh thng thng sang knh d phng trong cu hnh h thng N+1. Chuyn mch c iu khin t module SWO PROC. (e) iu ch Chn RSOH (ch ch MST) Chn RFCOH iu ch QAM Mch QAM MOD cung cp 64 mc hoc 128 mc QAM. B lc Roll-off cung cp gii hn bng tn tn hiu bng gc vi mt p ng xung hu hn (f) Chuyn i tn s IF sang RF Tn hiu IF iu ch 64/128QAM c a vo IF AMP qua b cn bng trong module TX RF. IF AMP, tn hiu IF c khuch i ti mc danh nh ri trn vi tn hiu RF ni b c to bi SYNTH (TX) bi b trn to ra tn hiu RF pht nh tn s knh n nh. (g) Lc thng di phn li ra ca module TX RF kt ni vi mt 3BPF bao gm b lc thng di 3 trng thi v mt circulator cui, lai b tt c cc tn hiu ngoi bng v hp th cc tn hiu phn x t li vo ca module FET AMP. (h) B dao ng ni my pht Module SYNTH (TX) l mt b dao ng iu khin pha t ng APC OSC. APC OSC l mt oscillator iu khin in p (VCO) to ra mt tn hiu cc b ca tn s RF tng ng vi bng tn RF c s dng. (i) Khuch i cng sut Tn hiu RF c khuch i vi module FET AMP ti mc u ra danh nh. Mc u ra ca FET AMP c iu chnh t ng ti mc nh trc nm trong -12 dB ti +2 dB mc RF thu c my thu i din gi khng i ng dng cho h thng ATPC v ALC.Nguyn Vn Qu D07VT3 - PTIT

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3.2.2.2 Phn thu Ti phn thu tn hiu c bin i ngc li so vi phn pht. Ban u tn hiu tn s v tuyn c bn i v tn s trung tn (RF - IF). Bn thu c thm phn bin i tn s RF xung IF phn phn tp khng gian Rx SD. Tip tn hiu c gii iu ch trong module MODEM, tn hiu sau khi tch sng c cn bng nh b cn bng vng thi gian thch ng, sau tn hiu c pht hin v sa li. Modun TR DIST phn pht tn hiu thu t knh bo v ti mi knh lm vic. Khi tn hiu truy nhp bo v cung cp trong h thng, tn hiu thu t knh bo v c gi ti thit b kt hp bn ngoi khi mi knh lm vic u hot ng bnh thng. Cui cng l khi phc tn hiu C-4 v STM-1 ri a qua khi chuyn mch 150M la chn tn hiu lng cc. 3.3. Thit b vi ba s SDH RMD 904 3.3.1 Gii thiu chungMY PHT

2 x 2048 kb/s

KH? I BANG T? N CO S? PHT

KH? I KCH THCH

KH? I K CNG SU? T

KH? I HI? N TH?Tn hi?u RF

B? L? C SONG CNG

KH? I HI? N TH?

2 x 2048 kb/s

KH? I BANG T? N CO S? THU

KH? I TRUNG T? N THU

KH? I BI? N ? I H? T? N

MY THU

Hnh 3.10: S khi thit b thu pht RMD 904Nguyn Vn Qu D07VT3 - PTIT

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Thit b thu pht RMD 904 l thit b vi ba s u tin c a vo lp t, khai thc trn mng truyn dn vi ba s ca nc ta. y l thit b vi ba bng hp do hng AWA ca c sn xut. Hin nay hu ht cc tnh, huyn u ang khai thc thit b ny. 3.3.2. Ch tiu k thut ca h thng RMD 904 Dung lng: 60 knh. Bng tn v tuyn: 820 MHz 960 MHz. Cng sut ra ch u anten: +36 dBm. Ngng thu: -90 dBm. iu ch tn hiu s: OQPSK. u vo s liu: HDB3 2,048 Mbit/s, 75 khng cn bng. iu ch knh nghip v: FM. Di tn knh nghip v: 15kHz. p tuyn tn s knh nghip v 3002200 Hz : +2dB 3 dB. Mc vo knh nghip v (600 : 0dBm. Mc ra knh nghip v (600 : 0dBm. T s tn hiu / tp m: >40dB (dBm op/chng). Tn s tone gi: 2,0 kHz. iu ch knh gim st: FM. Di tn knh gim st: 5 kHz/tone. p tuyn tn s knh gim st 2,7 kHz 5,0 kHz : + 2 dB 3dB. Mc vo knh gim st (600 : -10dBm. Mc ra knh gim st (600 : -10dBm. Ngun cung cp: in p mt chiu DC : -24 V hoc -48 V. Cng sut tiu th ton b trn mt my u cui: Vi cng sut ra 5W: 63W. Vi cng sut ra 1W: 43W. H thng vi ba c cc phng php d phng: D phng m (warm standby). D phng nng (hot standby). Phn tp tn s (frequency diverity). Phn tp khng gian (space diversity). thc hin bo v, trm vi ba c d phng c lp b chuyn mch bo v (protection switch).Nguyn Vn Qu D07VT3 - PTIT

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Thit b thu pht lm vic vi phi l cp ng trc tr khng 50. Ty theo iu kin thc t yu cu, thit b vi ba lm vic vi anten parabol ng knh: 0,9m; 1,2m; 1,8m; 2,4m. 3.3.3 My pht RMD 904

KHI HIN TH

2 x 2048kb/s

KHI BNG TN C S PHT

KHI KCH THCH

KHI K CNG SUT

RF

KHI NGUN CUNG

Hnh 3.11: S khi my pht RMD 904 My pht RMD 904 gm c cc khi chnh: Khi x l bng tn c s pht TxBB (Transmitter Base Band). Khi kch thch (Exciter). Khi khuch i cng sut pht PA: Power Amplifier. Tm mch hin th my pht: Tx Display.

Ch tiu k thut ca my pht RMD 904: Cng sut ra: +37dBm. Tr khng ra: 50. n nh tn s: +15ppm. Bc nhy tn s: 100kHz. Nhiu pht ra:

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BC full - NVQ - 3.8