EE 3008. Baseband Modulation Tutorial Questions
Q1)
Consider a binary PAM waveform of two bits, in which “1” is
represented by a positive rectangular pulse of amplitude
A
and
width
τ
, and “0” by a negative one. Assume that each bit has the
same probability of being a “1” or “0” and that the value of a
particular bit has no influence on the value of any other bit (i.e.,
each bit is independent).
(a)
Plot all the four possible waveforms representing “00”, “01”,
“10” and “11”, respectively.
(b)
Determine the energy spectrum for each waveform in (a).
Q2)
Still consider the binary PAM waveform in Q1.
(a)
Plot the energy spectrum of each waveform in Q1(a).
(b)
Plot the average energy spectrum.
(c)
Determine and plot the average power spectrum.
Note: The
average power spectrum
is defined as
Energy Spectrum of a series of pulses
Average Power Spectrum =
Time to transmit the series of pulses
.
Q3)
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 Fall '08
 PingLi
 Signal Processing, spectral density, spectrum, Baseband, binary PAM waveform

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