EEC 480 Exam 1 Student ID: (s points for cach, 15 points in total) Digital modul
ID: 3602863 • Letter: E
Question
EEC 480 Exam 1 Student ID: (s points for cach, 15 points in total) Digital modulation is accomplished with passband transmission by regulating or modulating a carrier signal that sits in the passband. We can modulate the amplitude, frequency, or phase of the carrier signal. Figure 1(a) indicates a binary signal. Please point out the modulating methods that are used in Figure 1(b)-(d). Figure 1 Figure 1(b): PSK (Phase Shift Keying)o ASK (Amplitude Shift Keying) oFSK (Frequency Shift Keying) Figure 1(c): PSK (Phase Shift Keying) ASK (Amplitude Shift Keying) o FSK (Frequency Shift Keying) Figure 1(d): a PSK (Phase Shift Keying) o ASK (Amplitude Shift Keying) o FSK (Frequency Shift Keying)Explanation / Answer
Figure 1(b): Amplitude Shift Keying (ASK) : With 0 and 1, only the aplitude of the wave is changing neither frequency nor phase is changing.
Figure 1(c): Frequency Shift Keying (FSK) : With 0 and 1 only the frequency of the wave is changing neither Amplitude nor phase is changing.
Figure 1(d): Phase Shift Keying (PSK) : With 0 and 1 only the phase of the wave (as clearly indicated in the figure) is changing neither Amplitude nor Frequency is changing.
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