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170
Baseband Pulse and Digital Signaling Chap. 3
p unipolar (f)
1
Weight = ––
2
0.5T b
f
(a) Unipolar NRZ
0
0.5R R 1.5R 2R
T b
p polar (f)
0.5T b
(b) Polar NRZ
0
0.5R R 1.5R 2R
f
(c) Unipolar RZ
p RZ (f)
0.5T b
Weight = ––
1 4
Weight = 0.1
0
0.5R R 1.5R 2R
f
0.5T b
p bipolar (f)
(d) Bipolar RZ
0 0.5R R 1.5R 2R
f
0.5T b
p manchester (f)
(e) Manchester NRZ
0 0.5R R 1.5R 2R
f
Figure 3–16
PSD for line codes (positive frequencies shown).