Chuyen Vien CTS Phai Hoc Thuoc

7/22/2019 Chuyen Vien CTS Phai Hoc Thuoc

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Ph lc( Km theo cng vn s 810/CTS-KSTS ngy 29/04/2010)

1. Mt s cng thc chuyn i n v o :dBW = 10logP(Watt)dBmW = 10logP(Milliwatt)dBW = 10logP(Microwatt)

dBV = 20logV(Volt)dBmV = 20logV(Millivolt)dBV = 20logV(Microvolt)dBm = dBW + 30dBmV = dBV + 60dBV = dBV + 120dBm = dBV - 107 ( Tr khng 50)dBV/m = dBV + Ke. (suy hao cp=0)( Ke l h s anten, Ke [dB/m] = -29,77 - G + 20logf[MHz], G (dBi) l tng ch ca

anten thu o).2. Qu ti u vo b trn tn.- Khi o cc tn hiu c cng sut ln thng b qu ti u vo b trn tn ca thit

b thu o, gy ra cc thnh phn phi tuyn (mo), lm cho kt qu cc php o khngng.- trnh tnh tnh trng qu ti u vo b trn tn ca thit b thu o, cn t ccmc suy hao ph hp u vo b trn tn c gi tr ti u.- pht hin qu ti u vo b trn tn ca thit b thu o, ta th nh sau : Thmsuy hao ng vo ca thit b thu o v quan st mc tn hiu thu c, nu bin

tn hiu gim theo lng suy hao, lc ny thit b thu o b qu ti u vo btrn tn ( V d : Khi thm 10dB ATT, nu bin tn hiu gim 20dB l my thu bxuyn iu ch bc 2, nu bin gim 30dB l b xuyn iu ch bc 3).

3. t bng thng o khi o cc tn hiu trong min pht x gi :TT Bng tn rng bng tn o (RBW)1 9kHz n 150kHz 1kHz2 150kHz n 30MHz 10kHz3 30MHz n 1GHz 100kHz4 Trn 1GHz 1MHz

5 i vi nghip v khng gian 4kHz* i vi Rada , cn tham kho phn III, Appendix 3.

4. o cng trng.Loi tn hiu Bng thng ti

thiu (kHz)Kiu tch sng

iu ch bin song bin (v dpht thanh AM)

9 hoc 10 Linear average

iu ch bin n bin ( v d 2,4 Peak

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J3E)Pht thanh FM 120 Linear (hoc log) averageTruyn hnh 120 Peak GSM 300 Rms hoc Peak (khi nhiu)WCDMA (3G) 3840Truyn hnh di ng T-DMB 1500iu tn , vi rng knh :- 12,5kHz- 20kHz- 25kHz

7,51212

Linear (hoc log) average

5. o bng thng tn hiu :- Thit lp thng s phng php o 99% nh sau :+ Tn s trung tm.+ Span : 1,5 n 2 ln bng thng (c lng) ca pht x.+ RBW Span x 3%.+ VBW t auto hoc VBW = RBW.+ Ch tch sng : Peak hoc Average.+ Thi gian qut : Auto+ iu chnh sao cho t s S/N 30dB.+ ng hin th (trace) : Maxhold (cho iu ch tng t), ClearWrite (cho iuch s).

- Thit lp thng s phng php o -26dB nh sau :+ Tn s trung tm.+ Span : 1,5 ln bng thng (c lng) ca pht x.+ RBW Span x 3%.+ VBW t auto hoc VBW = RBW.+ Ch tch sng : Peak hoc Average.+ Thi gian qut : Auto+ iu chnh sao cho t s S/N 30dB.+ ng hin th (trace) : Maxhold .* Chn phng php 99% o bng thng tn hiu i vi cc tn hiu thng tin shoc lng t ho vi ph cn tun hon nh tn hiu telegraph, tn hiu rada.* Chn phng php -26dB o bng thng tn hiu i vi cc tn hiu iu chQAM, PSKv cc tn hiu b nh hng nhiu bi knh ln cn.

6. Chuyn i mc tn hiu khi thay i RBW.Khi RBW = a , mc tn hiu o c l x (dBm). Khi thay i RBW = b, th mc tnhiu o c s l y (dBm) = x (dBm) + 10 log (b/a).Ch : a v b phi cng n v o.V d : RBW = 10kHz, mc tn hiu o c l - 80dBm. Khi thay i RBW =100kHz, mc tn hiu s l - 80dBm + 10log (100/10) = -80dBm + 10 = -70 dBm.

7. Pht thanh:

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7.1. Pht thanh MF :- Bng tn qui hoch : (526,5-1606,5)kHz- iu ch : AM- Phng thc pht : 9K00A3E- Khong cch knh : 10kHz.- Pht x gi khng c vt qu gii hn -50dBc so vi cng sut pht hoc mccng sut trung bnh tuyt i 50mW. Bng thng o 10 kHz (ITU-R SM. 329).

- Cng trng ti thiu ti ng bin vng phc v : 60dB V/m (ITU-R BS598 v ITU-R BS 703).- T s bo v nhiu cng knh ( Theo Khuyn ngh ITU-R BS 560) : 40dB (sngt).7.2. Pht thanh HF :- Bng tn qui hoch (KHz): 3900-3950; 5950-6200; 7200-7300; 15100-15800;17500-17900; 21450-21850; 25670-26100.- iu ch : AM- Phng thc pht : 9K00A3E

- Khong cch knh : 10KHz- Pht x gi khng c vt qu gii hn -50dBc so vi cng sut pht hoc mccng sut trung bnh tuyt i 50mW. Bng thng o 10 kHz (ITU-R SM. 329).- Cng trng ti thiu ti ng bin vng phc v : 40dBV/m ( ITU-R BS703).- T s bo v nhiu cng knh ( ITU-R BS 560) : 27dB7.3. Pht thanh FM :- Bng tn qui hoch : 47-50; 54- 68; 87-108MHz- iu ch : FM- Phng thc pht : 180KF3E (mono) ; 300KF8E (Stereo).- Khong cch knh : 200 KHz (mono) ; 300KHz (Stereo).- Pht x gi : Pht x gi khng c vt qu gii hn -80 dB PEP (so vi cngsut pht) hoc mc cng sut trung bnh tuyt i -36dBm (250 nW). Bng thngo: 100-120 kHz (TCN 68-192:2003).-Mt n ph pht x ngoi bng(mono), vi bng thng o 1KHz (ITU-R SM.1541):

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- Cng trng ti thiu ti ng bin vng phc v (ITU-R. BS 412-9) :

Khu vc Monophonic dB(V/m) Stereophonic dB(V/m)

Nng thn 48 54

Thnh th 60 66- T s bo v nhiu :Khong cchgia 2 sngmang (kHz)

T s bo v ( tn s dch tn cc i 75kHz)Mono Stereo

Nhiu lin tc Nhiu khnglin tc

Nhiu lin tc Nhiu khnglin tc

0 36 28 45 3725 31 27 51 4350 24 22 51 4375 16 16 45 37

100 12 12 33 25125 9,5 9,5 24,5 18

150 8 8 18 14175 7 7 11 10200 6 6 7 7225 4,5 4,5 4,5 4,5250 2 2 2 2275 -2 -2 -2 -2300 -7 -7 -7 -7325 -11,5 -11,5 -11,5 -11,5350 -15 -15 -15 -15

375 -17,5 -17,5 -17,5 -17,5400 -20 -20 -20 -20

8. Truyn hnh :8.1. Bng phn knh truyn hnh.

Bng Knh Gii hn knh(MHz)

Tn s hnh(MHz)

Tn s ting(MHz)

Ghi ch

II 3 76 - 84 77.25 83.75 Ch dnh cho i pht Tam o

6 174 - 182 175.25 181.75

7 182 - 190 183.25 189.758 190 - 198 191.25 197.75

III 9 198 - 206 199.25 205.7510 206 - 214 207.25 213.7511 214 - 222 215.25 221.7512 222 - 230 223.25 229.75

21 470 - 478 471.25 477.7522 478 - 486 479.25 485.75

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23 486 - 494 487.25 493.7524 494 - 502 495.25 501.7525 502 - 510 503.25 509.7526 510 - 518 511.25 517.7527 518 - 526 519.25 525.75

IV 28 526 - 534 527.25 533.7529 534 - 542 535.25 541.7530 542 - 550 543.25 549.75

31 550 - 558 551.25 557.7532 558 - 566 559.25 565.7533 566 - 574 567.25 573.7534 574 - 582 575.25 581.75

Bng Knh Gii hn knh(MHz)

Tn s hnh(MHz)

Tn s ting(MHz)

Ghi ch

35 582 - 590 583.25 589.7536 590 - 598 591.25 597.7537 598 - 606 599.25 605.7538 606 - 614 607.25 613.75

39 614 - 622 615.25 621.7540 622 - 630 623.25 629.7541 630 - 638 631.25 637.7542 638 - 646 639.25 645.7543 646 - 654 647.25 653.7544 654 - 662 655.25 661.7545 662 - 670 663.25 669.75

V 46 670 - 678 671.25 677.7547 678 - 686 679.25 685.7548 686 - 694 687.25 693.7549 694 - 702 695.25 701.75

50 702 - 710 703.25 709.7551 710 - 718 711.25 717.7552 718 - 726 719.25 725.7553 726 - 734 727.25 733.7554 734 - 742 735.25 741.7555 742 - 750 743.25 749.7556 750 - 758 751.25 757.7557 758 - 766 759.25 765.7558 766 - 774 767.25 773.7559 774 - 782 775.25 781.7560 782 - 790 783.25 789.75

61 790 - 798 791.25 797.75

62 798 - 806 799.25 805.75

Theo l trnh s ha th mt phn bng tn ny (790-806MHz) s c chuyn isang cho cc nghip v thng tin v tuyn khc.8.2. Truyn hnh tng t(PAL) :- Phng thc pht : 7M25C3F (Pht hnh) ; 750KF3E (pht ting) .- Khong cch knh : 8MHz.

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Khngchnhxc

500Hz

Nhiulin tc

52 51 48 44 40 36 33 36 40 44 48 51 52

Nhiukhnglin tc

45 44 40 34 30 28 27 28 30 34 40 44 45

Chnhxc

1Hz

Nhiulin tc

36 38 34 30 27 27 30 27 27 30 34 38 42

Nhiu

khnglin tc

32 34 30 26 22 22 24 22 22 26 30 34 38

+ Knh k trn : -6dB ( nhiu khng lin tc) ; 4dB (nhiu lin tc).+ Knh k di : - 9dB ( nhiu khng lin tc) ; 1dB (nhiu lin tc).- T s bo v nhiu tng t - s (ITU-R BT. 1368-8) :+ Cng knh : 34dB (nhiu khng lin tc); 40dB (nhiu lin tc).+ Knh k di : -9dB (nhiu khng lin tc); -5dB (nhiu lin tc).+ Knh k trn : -8dB (nhiu khng lin tc); -5dB (nhiu lin tc).8.3. Truyn hnh s DVB-T:- Phng thc pht : 8M00D2F.- Khong cch knh: 8MHz.- iu ch : 64-QAM, t l m 2/3.- Pht x gi khng c vt qu gii hn -80 dB PEP so vi cng sut pht hocmc cng sut trung bnh tuyt i -36dBm (250 nW); Bng thng o 100-120 kHz( Theo TCN 68-192:2003)- Mt n ph pht x ngoi bng, bng tn o 4kHz ( ITU-R SM.1541-2) :

- Cng trng ti thiu ti ng bin vng phc v (ITU-R BT.1368-8 ) :Bng tn s (MHz) Cng trng ti thiu (dBV/m)

DVB-T 8 MHz; 64-QAM; 2/3Bng 200 39

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Bng 550 45Bng 700 47

- T s bo v nhiu (ITU-R BT.1368-8) :+ Cng knh : 20dB (s - s); 9dB (s - tng t).+ Knh k s - s : -30dB.+ Knh k s - tng t : -34dB (knh k di); -38dB (knh k trn).8.4. Truyn hnh s di ng DVB-H:- Bng tn dnh cho truyn hnh s di ng :- iu ch : QPSK / 16QAM- Phng thc pht : 8M00D2F.- Khong cch knh : 8MHz- Pht x gi khng c vt qu gii hn -80 dB PEP so vi cng sut pht hocmc cng sut trung bnh tuyt i -36dBm (250 nW); Bng thng o 100-120 kHz( Theo TCN 68-192:2003).- T s bo v nhiu :

+ Cng knh vi DVB-H hoc DVB-T : 12,5dB (QPSK); 18,5dB (16QAM).+ Knh k DVB-H hoc DVB-T : -30dB.+ Cng knh vi truyn hnh tng tng t :

iu ch QPSK 16-QAM 64-QAMT l m 1/2 2/3 3/4 5/6 7/8 1/2 2/3 3/4 5/6 7/8 1/2 2/3 3/4 5/6 7/8

T s bo vnhiu

-12 -8 -4 3 9 -8 -3 3 9 16 -3 3 9 15 20

+ Knh k di vi truyn hnh tng t :iu ch T l m T s s bo v nhiu16-QAM 1/2 -43

64-QAM 1/2 -3864-QAM 2/3 -34

+ Knh k trn vi truyn hnh tng t :iu ch T l m T s s bo v nhiu16-QAM 1/2 -4764-QAM 1/2 -4364-QAM 2/3 -38

8.5. Truyn hnh s di ng T-DMB:

- iu ch : DQPSK- rng knh : 1,536MHz- Pht x gi khng c vt qu gii hn -80 dB PEP so vi cng sut pht hocmc cng sut trung bnh tuyt i -36dBm (250 nW); Bng thng o 100-120 kHz( Theo TCN 68-192:2003)- Mt n ph pht x ngoi bng, bng tn o 4kHz ( ITU-R SM.1541):

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.: i vi bng UHF__________ : i vi bng VHF

- T s bo v nhiu :

+ Cng knh vi T-DMB : 13,5dB.+ Knh k vi T-DMB : -30dB.+ i vi truyn hnh tng t, p dng bng sau (ITU-R BS.1660) :

f(MHz) = Tn s sng mang hnh - tn s trung tm ca T-DMB.PR(dB) : T s bo v.

9. Thng tin di ng t bo .9.1. Cng ngh GSM 2G:TT n v s

dngBng 900MHz Bng 1800MHz rng

knh(kHz)

Tiu chunk thut pdng

Downlink Uplink Downlink Uplink

1 Vinaphone935,1-943,5 890,1-898,5 1805-1825 1710-1730

200 TCN68-219:20042 VMS 951,7-959,9 906,7-914,9 1825-1845 1730-17503 Viettel 943,5-951,7 898,5-906,7 1845-1865 1750-17704 HTC 927-935 882-8905 GTel 1865-1880 1770-1785

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Ph tn hiu 1 knh GSM

9.2. Cng ngh CDMA 2G:TT n v s

dngBng tn s dng rng knh

(MHz)Tiu chun kthut p dngDownlink Uplink

1 SPT 874-880 829-835 1,25 TCN68-233 : 20052 EVN-Tel 463,08-467,37 453,08-457,37

Ph tn hiu CDMA

9.3. Cng ngh WCDMA/FDD/3G:

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TT n v sdng

Bng tn s dng rng knh(MHz)

Tiu chun kthut p dngDownlink Uplink

1 VMS 2110-2125 1920-1935 5 TCN 68-220:20042 Viettel 2125-2140 1935-1950

3 EVN -HTC 2140-2155 1950-19654 Vinaphone 2155-2170 1965-1980

Ph tn hiu WCDMA 3G:

10. WiFi. ( Theo thng t s 36/2009/BTTTT ngy 3/12/2009)- Thit b WiFi khng c gy nhiu c hi cho cc thit b v tuyn in ccp php tn s VT, thit b VT c c quan qun l tn s VT cho phphot ng v phi chp nhn nhiu t cc thit b VT khc.- Bng tn s dng : 2400-2483MHz; 5150-5250MHz; 5250-5350MHz; 5470-

5725MHz; 5725-5850MHz.- Trong bng tn 2400-2483MHz, cng sut pht ti a 100mW EIRP v Mt phcng sut ca pht x chnh khng c vt qu 100mW/100kHz EIRRP ( i viiu ch FHSS) hoc 10mW/1MHz EIRP ( i vi iu ch khc).- rng knh : 22MHz trong on bng tn 2400-2483MHz; 20MHz trong ccon bng tn khc.

Mt n ph tn hiu WiFi

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11. WiMax.

Bng tn s dng (MHz) rng knh (MHz)2300-2400 3,5/5/5,5/7/10/20

2496 26903300-3500

3400-36003600-38005725-5850

* Hin nay Vit nam ch cho php Wimax s dng 2 on bng tn (2,3-2,4)GHzv ( 2,496 2,690)GHz. Cc ang trnh Lnh o B TTTT cc phng n phnchia v s lng nh khai thc trong 2 on bng tn ny, Phng KSTS s cp nhtc th cc phng n phn chia vo phin bn sau.

Mt n ph tn i vi Wimax :

Ghi ch :Phn knh (MHz) A B C D

20 9,5 10,9 19,5 29,510 4,75 5,45 9,75 14,75

12. Truyn dn viba :

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TT Bng tn quihoch (MHz)

Khong cchknh (MHz)

Khong cchtn s gia knhthu-pht (MHz)

Dung lngtruyn dn tithiu (Mbps)

C ly truyn dnti thiu (Km)

1 1427-1530 4 65 / 49 2x2 302 3800-4200 29 / 58 213 34 / 2x34 303 4400-5000 40 300 140 /155 204 5925-6425 29,65 252,04 140/34 205 6425-7110 40 340 140/2x34 20

6 7110-7725 28/14/7/3,5 161 34/2x8/8/2x2 107 7725-8275 29,65 311,32 34 108 8275-8500 28

14119126

342x8

1010

9 9800-1045010500-10680

28/14/7/3,5 350 34/2x8/8/2x2 5

10 10700-11700 40 530 140 511 12750-13250 56/28/14/7/3,5 266 140/34/2x8/8/2x2 512 14300 - 14500 7/3,5 140 8/2x2 213 14500 - 15350 28/14/7/3,5 420 34/2x8/8/2x2 2

14 17700-19700 110/27,5112 10101232 140/3434 Tu 15 21200-23600 28/14/7 1232 34/2x8/8 Tu 16 24250-26500

27500-29500112/28/14/7 1008 140/34/2x8/8 Tu

V d trong on bng (3800-4200)MHz : rng knh bng 29MHz th tc truyn bng 34Mbps; rng knh bng 58MHz th tc truiyn bng 2x34Mbps.

13. LTE ( Long Term Evolution) :

Tham s LTEGiao din v tuyn DL: OFDMA

UL: SC-FDMAiu ch QPSK/16QAM/64QAMPhng thc song cng FDD/TDD rng knh (MHz) 1.25/1.4/1.6/2.5/5/10/15/20Bng tn s dng ti Vit Nam Uplink : 2500-2570 MHz

Downlink : 2620-2690 MHz

Cc cp php th nghim ti H Ni v thnh ph H Ch Minh nh sau :TT Doanh nghip on bng tn s dngUplink (MHz) Downlink (MHz)

1 Tng Cng ty Truyn thng a phngtin (VTC)

2500-2510 2620 - 2630

2 Cng ty C phn H tng Vin thngCMC

2510-2520 2630 - 2640

3 Tp on Vin thng Qun i 2520-2530 2640 - 2650

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4 Tp on Bu chnh Vin thng VitNam (VNPT)

2530 - 2540 2650-2660

5 Cng ty C phn Vin thng FPT (FPTTelecom)

2550 - 2560 2670-2680

Dng ph tn hiu LTE rng knh 10MHz

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