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Line Coding
By
Md. Fazle Rabbi
16CSE057
4.2
 What is LINE CODING
• The process of converting digital data to digital signals.
4.3
 Types of line Coding
4.4
 Topics discussed in this section
4.5
4.6
Unipolar
4.7
Unipolar
4.8
Unipolar
• Traditional NRZ scheme
bit 1  positive voltage
bit 0  zero voltage
4.9
Example
4.10
Figure 1 Unipolar NRZ scheme
4.11
Advantages Disadvantages
Unipolar
4.12
4.13
Polar
• The voltages are on both sides of the time axis.
4.14
Polar NRZ
• There are two versions:
• NRZ - Level (NRZ-L)
• NRZ - Inversion (NRZ-I)
4.15
Polar NRZ-L
bit 1  negative voltage
bit 0  positive voltage
4.16
Example
4.17
Figure 2 Polar NRZ-L schemes
4.18
Polar NRZ-I
bit 1  change
bit 0  no change
4.19
Example
4.20
Figure 3 Polar NRZ-I schemes
4.21
Comparing NRZ-L and NRZ-I
• NRZ-L and NRZ-I both have a DC component problem and baseline
wandering, it is worse for NRZ-L.
• Both have no self synchronization & no error detection.
• Both are relatively simple to implement
4.22
Polar - RZ
4.23
Polar - RZ
4.24
Polar - RZ
uses three voltage levels: +v, 0, -v
bit 1  starts at +V
bit 0  starts at -V
4.25
Example
4.26
Figure 4 Polar RZ scheme
4.27
Advantages Disadvantages
Polar
4.28
Polar - Biphase
4.29
Polar - Biphase:
• Manchester
coding consists of combining the NRZ-L and
RZ schemes.
• Differential Manchester
coding consists of combining the NRZ-I and
RZ schemes.
4.30
Manchester
Bit 1  starts at –V and moves +V in the
middle of bit interval.
Bit 0  starts at +V and moves -V in the
middle of bit interval.
coding consists of combining the NRZ-L and RZ schemes.
4.31
Example
4.32
Figure 5 Polar biphase: Manchester schemes
4.33
Differential Manchester
Bit 1  no transition
Bit 0  transition
Always has a transition of middle of each bit period
Transition or no transition.
coding consists of combining the NRZ-I and RZ schemes.
4.34
Example
4.35
Figure 5 Polar biphase: differential Manchester schemes
4.36
Thank you

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2. line coding (unipolar, polar)