Fundamentals of Digital Television Transmission phần 8 docx

... design of a candelabra or tee-bar system. 204 RADIO-WAVE PROPAGATION so that N r D 103.4 P a T C 84 .6  1 C 588 0 T  P w T D 103.4[P a C 0 .81 8P w 1 C 588 0/T] T At normal air temperatures, 588 0/T ... factor. Modification of the radiation resistance of a dipole in the presence of a ground plane is equivalent to the effect of the mutual impedance of a pair of parallel dipo...

Ngày tải lên: 14/08/2014, 16:20

... originality for much of the material included in this book. In fact, the story of digital television builds on the many contributions of workers since the beginning of radio and television transmission. ... data segment is 2 08 bytes 207 C 1. At 8 bits per byte and 3 bits per symbol, the data segment is 2 08 bytes ð 8 bits/byte ð 3 2 /3 bits/symbol, or 83 2 symbols in...

Ngày tải lên: 14/08/2014, 16:20

... P ma (dBm) 88 .3 91.3 93.3 93.3 Threshold power at receiver, P mr (dBm) 86 .3 86 .3 86 .3 86 .3 a 7 8 inner code rate, /T u of 1 8 and 16 QAM are assumed, yielding a threshold C/N of 13.9 dB ... (dBm) 93 .8 96.1  98. 0 Minimum receiver power (dBm)  78. 6 80 .9 82 .8 Case 2: Suburban Receiver temperature (K) 2610 2610 1450 Line temperature (K) 75 170 440 Antenna temperature (...

Ngày tải lên: 14/08/2014, 16:20

... CODING AND MODULATION FOR DIGITAL TELEVISION −0.4 −0.2 0.0 0.2 0.4 0.6 0 .8 1.0 3. 78 3.79 3 .80 3 .81 3 .82 Relative voltage Relative frequency (MHz) DVB-T 2k system Figure 3 -8. COFDM subchannel spectra. −50.00 −45.00 −40.00 −35.00 −30.00 −25.00 −20.00 −15.00 −10.00 −5.00 0.00 3.75 ... VSB, a portion of 7 Ibid., p. 85 . 58 CHANNEL CODING AND MODULATION FOR DIGITAL TELEVISION...

Ngày tải lên: 14/08/2014, 16:20

... 90. 68 0.106 26 545 90.06 0.107 27 551 89 .44 0.107 28 557 88 .84 0.1 08 29 563 88 .25 0.109 30 569 87 .67 0.109 31 575 87 .09 0.110 32 581 86 .53 0.111 33 587 85 . 98 0.112 34 593 85 .43 0.112 35 599 84 .89 ... 0.152 66 785 41.91 0. 182 33 587 49. 78 0.153 67 791 41.72 0. 183 34 593 49.49 0.154 68 797 41.53 0. 184 35 599 49.19 0.155 69 80 3 41.34 0. 185 Fundamentals o...

Ngày tải lên: 14/08/2014, 16:20

... 635 43.41 0. 186 8 183 90.53 0. 088 42 641 43.16 0. 187 9 189 88 .88 0.090 43 647 42.91 0. 188 10 195 87 .30 0.092 44 653 42.67 0.190 11 201 85 .80 0.093 45 659 42.43 0.191 12 207 84 .36 0.095 46 665 ... 0.077 14 473 83 .80 0.126 15 479 83 .13 0.127 16 485 82 .49 0.1 28 17 491 81 .85 0.129 18 497 81 .22 0.130 19 503 80 .61 0.131 20 509 80 .01 0.132 21 515 79.42 0.133 22 521...

Ngày tải lên: 14/08/2014, 16:20

... excitation of the upper and lower halves of SLOTTED CYLINDER ANTENNAS 181 f = 0° f=270° f= 180 ° f=90° 10 5 D /l = .0637 f = 0° f=270° f= 180 ° f=90° 10 5 D /l = .1910 f = 0° f=270° f= 180 ° f=90° 10 5 D /l ... TELEVISION f = 0° f=270° f= 180 ° f=90° 10 5 D /l = 0.5 f = 0° f=270° f= 180 ° f=90° 5 D /l = 1.25 f = 0° f=270° f= 180 ° f=90° 10 5 D /l = 8. 0 10 Figure 7- 28. Azimuth patter...

Ngày tải lên: 14/08/2014, 16:20

... ns 4 22 dB  28 dB 11 dB 82 00 ns 250 ns 950 ns 5  28 dB 11 dB 400 ns 1100 ns Model D − 18 −16 −14 −12 −10 8 −6 −4 −2 0 100 250 600 950 1100 Magnitude (dB) Delay (nS) Figure 8- 8. Magnitude delay ... to F 1 produces a loss of about 16 dB. The overall roughness of R 085 is approximately twice as great over much of the distance. The roughness of R110 is intermediate to R 085...

Ngày tải lên: 14/08/2014, 16:20

... 267 Transmitter: control, 80 , 85 , 96 cooling, 75, 78, 80 , 83 , 84 , 87 , 89 , 90 performance, 30, 36, 73, 74, 77, 78, 88 , 93 requirements, 36 retrofit of, 94, 95 solid state, 73, 75, 76–79, 83 , 87 , 89 –94 testing, ... 193, 1 98 beamwidth, 153, 155, 165, 169, 172, 177, 179, 186 , 196 current distribution, 166, 176, 177, 188 , 193 dipole, 176– 180 , 183 , 185 , 188 –193, 195,...

Ngày tải lên: 14/08/2014, 16:20

... 7, 5) 8 3 0 5 0 58 0 201 0 4 (17, 15, 13) 10 6 0 6 0 58 0 1 18 0 5 (37, 33, 25) 12 12 0 12 0 56 0 320 0 6 (75, 53, 47) 13 1 8 26 20 19 62 86 204 7 (171, 145, 133) 14 1 0 20 0 53 0 184 0 8 (367, ... 1 215 5 4 48 7 * 45 3 207 6 430 9 & 30 6 * 191 8 412 11 24 7 163 12 * 385 14 % 16 11 147 14 3 58 18 127 120 1 & 131 18 322 22 106 3 115 21 & 259 30 * 99 4 99 23 211 41...

Ngày tải lên: 07/08/2014, 21:20