Figure 8–1 Historical telephone system.

Figure 8–1 Historical telephone system.
Couch, Digital and Analog Communication Systems, Seventh Edition ©2007 Pearson Education, Inc. All rights reserved

Figure 8–2 Local analog telephone system (simplified).

Figure 8–3 Telephone system with remote terminals.

Figure 8–4 (a) (continued).
(a) POTS Line Card in a RT Couch, Digital and Analog Communication Systems, Seventh Edition ©2007 Pearson Education, Inc. All rights reserved

Figure 8–4 (b) Remote terminal (RT).
(b) Balanced Wheatstone Bridge Model for a Hybrid Circuit Couch, Digital and Analog Communication Systems, Seventh Edition ©2007 Pearson Education, Inc. All rights reserved

Figure 8–5 G.DMT digital subscriber line.

Figure 8–6 N-ISDN system with subscriber equipment attached.

Figure 8–8 Communications satellite in geosynchronous orbit.

Figure 8–9 Simplified block diagram of a communications satellite transponder.

Figure 8–10 64-GHz satellite transponder frequency plan for the downlink channels. (For the uplink frequency plan, add 2225 MHz to the numbers given above.) Couch, Digital and Analog Communication Systems, Seventh Edition ©2007 Pearson Education, Inc. All rights reserved

Figure 8–11 Transmission of broadcast-quality TV signals from a ground station.

Figure 8–12 SPADE satellite communication system for telephone VF message transmission.

Figure 8–13 Interleaving of bursts in a TDMA satellite.

Figure 8–14 Typical TDMA frame format.

Figure 8–15 Spectral allocations for U. S
Figure 8–15 Spectral allocations for U.S. digital-audio satellite systems. Couch, Digital and Analog Communication Systems, Seventh Edition ©2007 Pearson Education, Inc. All rights reserved

Figure 8–16 Block diagram of a communication system with a free-space transmission channel.

Figure 8–17 Thermal noise source.

Figure 8–18 Thermal source with a matched load.

Figure 8–19 Noise model for an actual device.

Figure 8–20 Another noise model for an actual device.

Figure 8–21 Noise figure measurement of a lossy transmission line.

Figure 8–22 Cascade of four devices.

Figure 8–23 Noise model for two cascaded devices.

Figure 8–24 Communication system model for link budget evaluation.

Figure 8–25 Galaxy I (134° W longitude) antenna pattern EIRP footprint (contours given in dBw units). [Courtesy of Hughes Communications, Inc., a wholly owned subsidiary of Hughes Aircraft Company.] Couch, Digital and Analog Communication Systems, Seventh Edition ©2007 Pearson Education, Inc. All rights reserved

Figure 8–27 Output SNR as a function of FM detector input CNR
Figure 8–27 Output SNR as a function of FM detector input CNR. [Curve for the Microdyne receiver, Model 1100TVR, courtesy of the Microdyne Corporation, Ocala, FL, 1981.] Couch, Digital and Analog Communication Systems, Seventh Edition ©2007 Pearson Education, Inc. All rights reserved

Figure 8–28 FT-2000 optical-fiber ring system.

Figure 8–29 Cellular telephone system.

Figure 8–30 Generation of a composite black-and-white video signal.

Figure 8–31 TV transmission system.

Figure 8–32 Black-and-white TV receiver.

Figure 8–33 Spectrum of composite FDM baseband modulation on the FM aural carrier of U.S. TV stations. Couch, Digital and Analog Communication Systems, Seventh Edition ©2007 Pearson Education, Inc. All rights reserved

Figure 8–34 Generation of the composite NTSC baseband video signal
Figure 8–34 Generation of the composite NTSC baseband video signal. [Technically, mq(t) is low-pass filtered to an 0.5-MHz bandwidth and mi(t) is low-pass filtered to a 1.5-MHz bandwidth.] Couch, Digital and Analog Communication Systems, Seventh Edition ©2007 Pearson Education, Inc. All rights reserved

Figure 8–35 Vectorscope presentation of the complex envelope for the 3
Figure 8–35 Vectorscope presentation of the complex envelope for the 3.58-MHz chrominance subcarrier. Couch, Digital and Analog Communication Systems, Seventh Edition ©2007 Pearson Education, Inc. All rights reserved

Figure 8–36 Color TV receiver with IQ demodulators.

Figure 8–37 U.S. television synchronizing waveform standards for color transmission. (From Part 73 of FCC Rules and Regulations.) Couch, Digital and Analog Communication Systems, Seventh Edition ©2007 Pearson Education, Inc. All rights reserved

Figure 8–38 8-level baseband signal with segment sync.

Figure 8–39 Spectrum of 8-VSB DTV signal with square root raised cosine-rolloff.

Figure 8–40 CNR for a PCD wireless link.

Figure 8–41 BER for a PCD wireless link.

Figure 8–1 Historical telephone system.

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Figure 8–1 Historical telephone system.

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