Define analog-to-analog conversion in Software

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8 Define analog-to-analog conversion
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9 Which characteristics of an analog signal are changed to represent the lowpass analog
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signal in each of the following analog-to-analog conversions a AM
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b FM
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c PM
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] 0 Which of the three analog-to-analog conversion techniques (AM, FM, or PM) is the most susceptible to noise Defend your answer
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11 Calculate the baud rate for the given bit rate and type of modulation a 2000 bps, FSK b 4000 bps, ASK c 6000 bps, QPSK d 36,000 bps, 64-QAM
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12 Calculate the bit rate for the given baud rate and type of modulation a 1000 baud, FSK b 1000 baud, ASK c 1000 baud, BPSK d 1000 baud, 16-QAM 13 What is the number of bits per baud for the following techniques a ASK with four different amplitudes b FSK with 8 different frequencies c PSK with four different phases d QAM with a constellation of 128 points 14 Draw the constellation diagram for the following: a ASK, with peak amplitude values of 1 and 3 b BPSK, with a peak amplitude value of 2 c QPSK, with a peak amplitude value of 3 d 8-QAM with two different peak amplitude values, I and 3, and four different phases 15 Draw the constellation diagram for the following cases Find the peak amplitude value for each case and define the type of modulation (ASK, FSK, PSK, or QAM) The numbers in parentheses define the values of I and Q respectively a Two points at (2, 0) and (3, 0) b Two points at (3, 0) and (-3, 0) c Four points at (2, 2), (-2, 2), (-2, -2), and (2, -2) d Two points at (0 , 2) and (0, -2) 16 How many bits per baud can we send in each of the following cases if the signal constellation has one of the following number of points a 2 b 4 c 16 d 1024 17 What is the required bandwidth for the following cases if we need to send 4000 bps Let d = 1 a ASK b FSK with 2~f = 4 KHz c QPSK d 16-QAM 18 The telephone line has 4 KHz bandwidth What is the maximum number of bits we can send using each of the following techniques Let d = O a ASK b QPSK c 16-QAM d64-QAM
ANALOG TRANSMISSION
19 A corporation has a medium with a I-MHz bandwidth (lowpass) The corporation needs to create 10 separate independent channels each capable of sending at least 10 Mbps The company has decided to use QAM technology What is the minimum number of bits per baud for each channel What is the number of points in the constellation diagram for each channel Let d = O 20 A cable company uses one of the cable TV channels (with a bandwidth of 6 MHz) to provide digital communication for each resident What is the available data rate for each resident if the company uses a 64-QAM technique
21 Find the bandwidth for the following situations if we need to modulate a 5-KHz voice a AM b PM (set ~
c 22 Find the total number of channels in the corresponding band allocated by FCC a AM b FM
=5) PM (set ~ = 1)
Bandwidth Utilization: Multiplexing and Spreading
In real life, we have links with limited bandwidths The wise use of these bandwidths has been, and will be, one of the main challenges of electronic communications However, the meaning of wise may depend on the application Sometimes we need to combine several low-bandwidth channels to make use of one channel with a larger bandwidth Sometimes we need to expand the bandwidth of a channel to achieve goals such as privacy and antijamming In this chapter, we explore these two broad categories of bandwidth utilization: multiplexing and spreading In multiplexing, our goal is efficiency; we combine several channels into one In spreading, our goals are privacy and antijamming; we expand the bandwidth of a channel to insert redundancy, which is necessary to achieve these goals
Bandwidth utilization is the wise use of available bandwidth to achieve specific goals Efficiency can be achieved by multiplexing; privacy and antijamming can be achieved by spreading
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