communication engineering lab report, 5th sem, electrical engineering, IIT Delhi, eep306

1. 23-8-12
Experiment
Line Coding
Aim: To study and get familiar with properties of Line-Code Encoder and Line-Code
Decoder modules.
Introduction:
Its main purpose is to serve as interface between TTL signals and Analog channel and vice-
versa
Line coding is used for various purposes like-
Spectrum Shaping: This are used to reshape and relocate the filter without any
modulation or filtration.
Remove DC component.
Error detection
We analyse NRZ-L, NRZ-M, UNI-RZ, BIP-RZ, RZ-AMI, Biφ-L, DICODE-NRZ and duo-
binary encoding.
Observations and remarks:
Line code ENCODER:
NRZ-L
There is a delay in the o/p of the line code encoder.
NRL-Z

2. UNI-RZ
BIP-RZ

3. RZ-AMI
Biφ-L

4. DICODE-NRZ
Duo-binary Encoding

5. Line code DECODER:
NRZ-L
Note: top one is input, middle one is coded signal and bottol one is decoded signal
NRZ-M

6. BIP-RZ
RZ-AMI

7. BIφ-L
DICODE-NRZ

8. Duo-binary Encoding
UNI-RZ:

9. The decoded signal for unicode-rz scheme was not observed. However we checked the
system and there were no issues.
Conclusion
Line coding schemes are used to convert analog to TTL and vice-versa. This are also used for
various purposes like converting a binary signal to three level or (+-) signal. This are used for
error detection, etc without using any filter or modulation.