Sol05 - CHAPTER 5 Analog Transmission Solutions to Review...

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1 CHAPTER 5 Analog Transmission Solutions to Review Questions and Exercises Review Questions 1. Normally, analog transmission refers to the transmission of analog signals using a band-pass channel. Baseband digital or analog signals are converted to a complex analog signal with a range of frequencies suitable for the channel. 2. A carrier is a single-frequency signal that has one of its characteristics (amplitude, frequency, or phase) changed to represent the baseband signal. 3. The process of changing one of the characteristics of an analog signal based on the information in digital data is called digital-to-analog conversion . It is also called modulation of a digital signal. The baseband digital signal representing the digital data modulates the carrier to create a broadband analog signal. 4. a. ASK changes the amplitude of the carrier. b. FSK changes the frequency of the carrier. c. PSK changes the phase of the carrier. d. QAM changes both the amplitude and the phase of the carrier. 5. We can say that the most susceptible technique is ASK because the amplitude is more affected by noise than the phase or frequency. 6. A constellation diagram can help us define the amplitude and phase of a signal element, particularly when we are using two carriers. The diagram is useful when we are dealing with multilevel ASK, PSK, or QAM. In a constellation diagram, a signal element type is represented as a dot. The bit or combination of bits it can carry is often written next to it.The diagram has two axes. The horizontal X axis is
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Sol05 - CHAPTER 5 Analog Transmission Solutions to Review...

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