01. 0. 04. 05. 0. 07. 08. 09.. 11. 1. 13. -1 0 1 14. 15. 1. 17. 18. 0.. 3. 4. 5.. 7. 8. 9. 30. 31. 3.4(c 3.7(a 3.8 58 3. 33. 34. 3.9 35. 3. IRA IRA? 37. 38. 39. 40.
41. 4. 43. 44. 45. 47. 48. 49. B M 50. B C 51. SNR 5. Nyquist Shannon P.58 54. P.73-74 55. 5. 57. 58. E b /N 0 59. 0.
1 waveguide 300MHz 1GHz GHz 40GHz 300GHz 00TGHz 3 Internet
4 5 7 8 9 11 1 13-1 0 1
14 T 1/ f f 1/ T 15 s ms us ns ps H KHz MHz GHz THz 1 17 0 T 0 f 1/ T 18 19 3A.1 3A. 0 Aτ f k/τ
1 3 4 5 7 0 8 T f v / f v T f v / 9 3 8 m/s 8 m/s 30 3.5(b 90%
31 3.4(c 3.7(a 3.8 58 4MHz f 1MHz 3.7(a ] 5 sin( 5 1 3 sin( 3 1 [sin( 4 ( t t t t s + + π π π π BW 4MHz 4 (5 1MHz 0 1 Nyquist R b Mbps 3.8 Mbps 4MHz 8MHz f MHz BW 8MHz 8 ( (5 4Mbps 4MHz 4Mbps MHz 3.4(c ] 3 sin( 3 1 [sin( 4 ( t t t s + π π π BW 4MHz 4 ( (3 1 3 Wbps WHz 4 5 3 33
34 3.9 0Hz 7kHz 00Hz 700Hz 5dB 300 3.9 0Hz 0kHz 5dB 8kHz 300Hz 3400Hz 50dB-45dB -30dB 35dB 300kHz 3MHz 30M 300MHz 35 CRT NTSC 30 0Hz 0 0 0 HDTV 3 IRA IRA? IRA - International ITU-T Reference Alphabet ITA - International Telegraph Alphabet
TTS TeleTypeSetter Code ITA ITA ITA3 ITA5 5 TTS TTS 7 TTS 7 TTS IRA 18 IRA Information Interchange ASCII 37 7 8 1 1 38 300~3400Hz 3kHz 0 300 4kHz 39 CCIR-M / NTSC 4.MHz 4MHz 5 5.5us 4.MHz 5 5.5us P.4~5 0Hz (55 / 0 / 15750 / 450 / 55 / 40 - - - IP / 41
4 43 44 45 1 3
4 S(t N(t S(t N(t S(t N(t N(t S(t 5 4 47 48 49 B B log M log M log M M M 4 M 4 1 M 8 4 M 50SNR 51 B C
5 Nyquist Shannon P.73~74 53 P.58 CB P.58 4 P.58 3.8 3kHz 3000 Amplitude Shift Keying 1 1 0 3kHz 3000 kbps 54 P.73-74 P.73-74 8 8PSK SNR db 4dB SNR 51 51 3kHz CB kbps 31 35dB Clog (1+S/N 3000 log (1+313000 log 3133000 11.3480bps 34.8kbps ITU-T V.34 33.kps 5kbps V.90 5kbps 33.kbps V.9 48kbps 5kbps
55 C log (1+S/N Blog (1+0 Blog 1 B 0 0 5 57 R b / b/s bps R B baud R b R B log M bps log M M log M M 0 1 M R b R B M8 R b R B log 8 3 R B 3 58 E b /N 0 E b /N 0 SNR 59 B Rb n R b / B (bps/hz
n R B log M/ B (bps/hz M B 0