LGW2EChapter3figures

LGW2EChapter3figures - Chapter 3 Digital Transmission...

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Chapter 3 Digital Transmission Fundamentals Chapter Figures
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Leon-Garcia/Widjaja Communication Networks H W =++ H W H W H W Color image Red component image Green component image Blue component image Total bits before compression = 3 × H × W pixels × B bits/pixel = 3HWB Figure 3.1
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Leon-Garcia/Widjaja Communication Networks /2 3 /2 5 /2 7 /2 - /2 -3 /2 -5 /2 -7 /2 (a) Original waveform and the sample values /2 3 /2 5 /2 7 /2 - /2 -3 /2 -5 /2 -7 /2 (b) Original waveform and the quantized values Figure 3.2
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Leon-Garcia/Widjaja Communication Networks (a) QCIF videoconferencing at 30 frames/sec = 760,000 pixels/sec 144 176 (b) Broadcast TV at 30 frames/sec = 10.4 x 10 6 pixels/sec 720 480 (c) HDTV at 30 frames/sec = 67 x 10 6 pixels/sec 1080 1920 Figure 3.3
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Leon-Garcia/Widjaja Communication Networks Receiver Communication channel Transmitter Figure 3.4
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Leon-Garcia/Widjaja Communication Networks (a) Sent Sent Received Received Examples: digital telephone, CD Audio Examples: AM, FM, TV transmission (b) Figure 3.5
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Leon-Garcia/Widjaja Communication Networks Source Repeater Destination Repeater Transmission segment Figure 3.6
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Leon-Garcia/Widjaja Communication Networks Attenuated and distorted signal + noise Equalizer Recovered signal + residual noise Repeater Amp Figure 3.7
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Leon-Garcia/Widjaja Communication Networks Amplifier equalizer Timing recovery Decision circuit and signal regenerator Figure 3.8
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Leon-Garcia/Widjaja Communication Networks Communication channel d meters 0110101. .. 0110101. .. Figure 3.9
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Leon-Garcia/Widjaja Communication Networks (a) Low-pass and idealized low-pass channel f 0 W A ( f ) 0 W f A ( f ) 1 Channel t t (b) Maximum pulse transmission rate is 2 W pulses/second Figure 3.10
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Leon-Garcia/Widjaja Communication Networks SNR = Average signal power Average noise power SNR (dB) = 10 log 10 SNR Signal Noise Signal + noise High SNR t t t Signal Noise Signal + noise Low SNR t t t Figure 3.11
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Leon-Garcia/Widjaja Communication Networks Th e s p ee ch s i g n al l e v el v a r ie s w i th t i m(e) Figure 3.12
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Leon-Garcia/Widjaja Communication Networks Figure 3.13
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Leon-Garcia/Widjaja Communication Networks 1 0 1 0 1 0 1 0 . . . . . . t 1 ms (a) 1 ms 1 1 1 1 0 0 0 0 . . . . . . t (b) Figure 3.14
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Leon-Garcia/Widjaja Communication Networks (a) Frequency components for 10101010 0 0.2 0.4 0.6 0.8 1 1.2 1.4 0 5 10 15 20 25 30 35 40 45 frequency (kHz) |a mp li tu de | (b) Frequency components for 11110000 0 0.2 0.4 0.6 0.8 1 1.2 1.4 50 |am pl it ud e| Figure 3.15
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Leon-Garcia/Widjaja Communication Networks s (noisy ) | p (air stopped) | ee (periodic) | t (stopped) | sh (noisy) Figure 3.16
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Leon-Garcia/Widjaja Communication Networks f W X(f) 0 Figure 3.17
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Leon-Garcia/Widjaja Communication Networks T x(t) t x(nT) nT Figure 3.18
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