00D8104013K 2004 3
LAN Micro AVS LAN i
1 1 2 LAN 2 2.1 LAN ( Local Area Network ) 2 2.1.1 2 2.1.2 LAN 3 2.1.3 3 2.2 LAN 4 2.3 LAN 5 2.4 LAN 6 3 7 3.1 7 3.1.1 7 3.1.2 7 3.1.3 LAN 7 3.2 9 3.2.1 9 3.2.2 10 3.2.3 11 3.3 ITU-R 11 4 13 4.1 13 4.2 13 4.3 14 4.4 14 5 15 5.1 15 5.2 15 5.3 17 5.3.1 17 5.3.2 3 8 17 5.4 18 5.4.1 2 (1) 18 ii
5.4.2 2 (2) 20 6 23 6.1 23 6.2 23 6.3 26 6.4 3 26 6.5 3 27 7 28 7.1 28 7.2 28 29 29 iii
1 LAN LAN 1
2 LAN 2.1 LAN Local Area Network LAN LAN [1] 2.1.1 LAN LAN LAN 2.1 2.4 2.1 2.4 LAN LAN LAN 2.1 2.2 2
2.3 2.4 2.1.2 LAN LAN LAN 2.1.3 LAN LAN LAN 3
LAN 1 LAN LAN 0 1 2.2 LAN LAN LAN LAN LAN LAN 1bit LAN LAN LAN LAN LAN 4
2 3 B A, C A C B A B C A 2.5 2.3 LAN LAN LAN LAN LAN LAN LAN LAN LAN 2.6 2.7 LAN LAN LAN 5
2.6 2.7 2.4 LAN IEEE802 IEEE LAN IEEE802 LAN IEEE802.11b IEEE802.11g IEEE802.11a 2.1 LAN 2.4GHz 11Mbps Bluetooth 2.4GHz 54Mbps IEEE802.11b 5GHz 54Mbps 6
3 3.1 [2] 3.1.1 3.1 ITU 3.1.2 3.1.3 LAN 300MHz 3GHz UHF 3GHz 30GHz SHF LAN LAN 2.4GHz 5GHz 2.4GHz 2.4GHz LAN 5GHz 5GHz LAN 7
3.1 100km 3kHz VLF 10km 30kHz L F 1km 300kHz AM M F 100m 3MHz H F 10m 30MHz FM VHF 1m 300MHz PHS MCA TV UHF LAN 2.4GHz 2.4GHz ISM 10cm 3GHz SHF LAN 5GHz 22,26,38GHz ISM 1cm 30GHz EHF 1mm 300GHz 8
3.2 3.2.1 P d d P i 3.1 3.1 P d P d P i 2 i P d i P = 4πd (3.1) 1/ 4πd 2 d 3.2 G G td t t t r P t P = G P (3.2) G t G r P t d Pr 9
3.2 d 1/ 4πd 2 G P / 4πd t t 2 2 λ / 4π G r P r = G r P 4πd t 2 2 λ Gr 4π 2 λ = 4πd G G P r t t (3.3) 2 ( λ / 4πd ) d L (3.4) 2 λ L = 4πd (3.4) d / λ 3.2.2 1 3.3 10
3.2.3 3.3 ITU-R ITU-R ITU 4 ITU-R ITU-R Ltotal = 20 log f + N log d + L f ( n) 28 [db] (3.5) Ltotal db d [m] N db L f 11
f [MHz] n 3.2 ITU-R N 900MHz 33 20 1.2 1.3GHz 32 22 1.8 2.0GHz 28 30 22 4GHz 28 22 60GHz 22 17 3.3 ITU-R 9(1 ) 900MHz 19(2 ) 24(3 ) 1.8 2.0GHz 4n 15+4(n-1) 6+3(n-1) L f 3.2 3.3 N L ITU-R f 12
4 [2] 4.1 Ray trace 2 4.2 3 4.1 13
4.3 4.2 4.4 14
5 Micro AVS 3 8 2 2 4 1 2 2 3 3 3 3 5.1 5.1 5.2 step1: step2: 15
step3: step2 2 step4: 5 5 4 step5: 1 4 1 3 5 step6: step2 step3 step4 step5 5 3 4 2 1 5.2 16
5.3 5.3.1 2 2 4 1 4 1-2 2-3 3-4 4-1 4 1 2 4 3 5.3 5.3.2 3 8 3 8 5.3.1 2 Micro AVS 17
5.4 3 8 5.4 2 2 5.4.1 2 (1) b c c a d b a (a) (b) 5.5 2 (a) 2 (b) d 18
2 ab cd c d ab a b cd ab 2 c d abc abd [3] 3 a b c 3 a b c 3 a b c S 5.1 abc S = 1 2 a. x a. y 1 b. x b. y 1 = c. x c. y 1 1 (( a. x c. x) ( b. y c. y) + ( b. x c. x) ( c. y a. y)) 2 (5.1) b c c a b a (a) S > 0 (b) S < 0 5.6 3 a b c (5.1) S < 0 c b a 5.7 d 3 0 3 x y 19
5.4.2 2 (2) A B C D AB CD 2 2 A B CD C D AB 2 [4] C B B C D B D A C A D A (a) (b) 5.8 y = ax + b y > ax + b y < ax + b 3 y y y 0 x 0 x 0 x (a) y = ax + b (b) y > ax + b (c) 5.9 3 y < ax + b 2 y ax b > 0 y ax b < 0 (5.2) 20
( X, Y ) 2 0 A B A ( x 1, y1) B ( x2, y2) 2 C D C ( x 3, y3) D ( x4, y4) A ( x 1, y1) B ( x2, y2) AB y = x ( y1 y2) /( x1 x2) + y1 x1 ( y1 y2) /( x1 x2) (5.3) 0 ( x1 x2) y ( x1 x2) = x ( y1 y2) + y1 ( x1 x2) x1 ( y1 y2) (5.4) ( x 1 x2) ( y y1) + ( y1 y2) ( x1 x) = 0 (5.5) (5.5) A ( x 1, y1) B ( x2, y2) C( x 3, y3) D ( x4, y4) C tc = ( x1 x2) ( y3 y1) + ( y1 y2) ( x1 x3) (5.6) D td = ( x1 x2) ( y4 y1) + ( y1 y2) ( x1 x4) (5.7) (5.6) (5.7) 21
tc td < 0 (5.8) AB CD ta = ( x3 x4) ( y1 y3) + ( y3 y4) ( x3 x1) (5.9) tb = ( x3 x4) ( y2 y3) + ( y3 y4) ( x3 x2) (5.10) ta tb < 0 2 2 22
6 6.1 6.1 1 1 2 2 3 3 4 4 5 1 2 3 4 5 1 2 3 4 5 6.1 6.2 5 23
6.2 2 6.2 6.3 6.2 6.3 24
3 8 6.4 6.4 2 6.5 6.5 2 25
6.3 6.2 6.3 6.2 6.1 6.4 1 6.5 1 2 1 1 2 3 6.4 3 3 1 3 26
6.5 3 6.6 3 6.6 27
7 7.1 LAN 2 3 8 2 3 7.2 3 3.2.1 28
[1] 1998 [2] 1999 [3] 2001 [4] 1998 29