通信专业实务中级传输与接入专业2015真题解析资料.pdf

Scanned by CamScanner 5 .4 2015 ( 15 ) 1 (7 1 (n)) (1) (2) (3)(4) (5)(6)G653 (7)1550 nm u 2(3 1(n)) (1)(2) (3) 351 y “ ()x( )) (1) ( (2) 850 n m1310 nm1550 n m( (3) (I MDD) ( (4) ( (5) ( 1 G653 G653(DSF)1 550 nm D WD MFWM 2 ( SR S ) (SB S) (SpM) (XPM ) (FW M) Scanned by CamScanner 3l (1) ( ) (2) 1 085 n m 2 1 30 nm (S ) 3 155 nm(C ) 1 611620 nm 4 1 3501 450 nm 5 1 528154 5 nm 1350 1450 n m (3) (IMDD) / PCM (4) (5) 1 (1)() (2)( ) (3)() (4)() (7)(DSF) (5)(6) 2 (1) (2) (SRS) (3) (SBS) (2) (3) Scanned by CamScanner 3 ( 15 ) 1 (4 1 (n) ) SDH ST M N (1) 2SD H (3) (4) 2 (7 1 (n) ) (a)A SON (1) (2) (b) (M STp) (3) ppp/HDLc GFp c4 5 STM N (c)WDM (6)(7) 3(4) 1 550 nm02 dB /km ? 1 SDH SDH SDHSTM N SDH () () 2 A S ON MSTP D W D M (a) (CP) 送(T P)面(M P) (DCN)ASON ( CC I) (b)MST p (LCA S) PPP/HDL C LAPSGFP. Scanned by CamScanner () STM N ST MN (c)DW D MX0×C) (ÒAD M) OA D MSD H/(A UM)j VB 3çrAJ L1I OA DM @ 0×C d0 × C® ® (OA DM)(0×C) O×COA DM 0 ×C ' ' a (Â) = 0 l g l _lg2 = 0. 2dB / fo ?1 P. 1 (1) (2)() (3)() (4) 2 (1)( CP) (2)( M P) (3) () (4) ( ) (5) (6) (OADM) (7)(0× C) (6)(7) 3 Scanned by CamScanner 3 d B , 10 1o gi o 05=3(dB) 3 = 0 2=15 (km ) L = 15 ( km ). (15 ) 1(3 1 (n)) HFC (1) (2)HFC(3 2(71 (n)) (I) (PON)pONEt her net(2) GEM (3)PO NON U(4) (5)(6)) 3(51(n) ) (1) 1 550 nm (2) 1 2 791 670 n m (3)4)(5) 1 H FC (Hybrid F iber Co ax , H FC) (HFC) HFC HFC ( ) SCM . 2 PON (OAN) (AON) (P O N ) A ON Scanned by CamScanner pON EPONGPONPON F I T x EPON p o N . Et her net IPGpON GEM , ATM Qos PON0 N U0LT T DM A() WDM A( )CDM A() SCM A() 3 () (ED FA)(PD FA) SBA SRA EDFA1 550n m PD FA13 10nm SR A 1279^ 1670 n m (1) () (2) () (3) ( scM) i “ n 2 (1) (AON) ( 2 ) EPON Scanned by CamScanner 3 (1) ( EDFA ) (2) ( SRA , FRA , RFA) (3) (4) ( ) (5) (3)(4) (5) (20 ) 1 (15 1 ““ () () ) (1)3G Hz lm ( (2) (3) ( (4)T DMA ( (5) SD M A . ( (6) ( (7) ( (8)LT EOFD MT D M A . ( (9)( (10)( (11)Mv10( (12)G SM( (13)( (14) G1 ( (15)( 2)(5) L=32 44 +20 lgd+20 lgf dB , GSM900DC S1800dB? 1 (1) =/3GHz 3x10 8 m / s 3× 10 9 u s = 0Im (2) Scanned by CamScanner (3) (4)(T DM A) () () T D M A (5)(SD M A) SDM A (6) (7) H D 2 B Scanned by CamScanner (8)LTE OFD MTDM A .( LT E OFDM A , FDM A , T D M A , SD MA . SC FD M A . (9) (A MC) (HARQ) ARQFECFEC H A RQ HARQ A MCHA RQ AMCHA RQ (10) (11) M I M O () (12) G SM GSM (FCA) a« *1 At x & L (13) Scanned by CamScanner (14) G/T GT G/T G G/ T (15) 17 4 ° 4 5 ° 2 G SM L p L p -3244 + 20 lg d + 20lgf GSM900DCS1800 G SM G SM900 900 M H ZDCS18001800 MH Z 1D CS1800 L GSM900 -20 1g1800 20 1g 900 = 20 1g 2-6 dB ( 4 ). G SM900DCS1800 DC S1800 G SM900 6 dB . 1 ( 1 ) x ( 2 ) V Scanned by CamScanner 2) S1800 L GsM9oo -201g1800 201g 900 = 20 1g 2. 6 ( dB ) ( 4 ) D C 81800 GSM900 6dB . (15) 1(7 1 (n) ) 91)(2) (3)(4) (5(6) (7) ABC D E FG HI J L MN 2(8 1 (n) (1) (2)(3) (4) (5) (6) (7) dBm (8) A B C DE F ) 1 Scanned by CamScanner K 413 1 KO, O1. 2) () () 12dB ( ) () (75%) = x(dB) ( dBm) P , - ). . +101gR 174++(1) P. Æ (). . N 0 R(Hz) CD MA (2) Scanned by CamScanner ( ) L p ( dB )- 9244+201gd ( km ) +20lgf ( GHz ) L p ( dB )- 32 44+201gd ( km ) +20lg f ( MHz ) ( 3 ) 1 2 dBm 3L dB , d f 1 dd 1 (1)N ( 2 ) H (3)K ( 4 ) D ( 5 ) F (6) ( 7 ) C 2 (1)A ( 2 ) B (3)A ( 4 ) A (5/F ( 6 ) C ( 7 ) D (8)D (20) 1(6 ) G SM 4×3l×3 ? 2(4 1 (n) ) A B n l n2 (1) (2) n l n 2 (3)(4) Scanned by CamScanner , (km) t£ v , (1m1) A ' B 3(5 ) CDM A 4(5) 10kHz , 1 2 8 MHz ? 1 · G SM . l×3 l×3 D T X 2 (50 km)AB n l n2 B A n 2 2 635 Scanned by CamScanner n 35 1618 46 23 n 1 n2 A B A 3 CDMA RL P( ) F ER 1%F ER5% F ER3% 4 (Dir ect Seque nc e Spr ead Spe ctr u m )(DS) x 10kHz = _00078125 128M Hz 128 (0 0078125 . 0 007 8 . 00080 01 ) ) 1 l×3 l×3 / (4×3 ) 2 (I)B ( 2 ) A Scanned by CamScanner 。