Line Codes for Communication Systems

This repository provides implementations of various line coding techniques used in communication systems.Line coding is a process of converting digital data to digital signals. This repository is structured into three main categories: 'Bipolar', 'Polar', and 'Unipolar', each containing methods for 'Non-Return-to-Zero (NRZ)' and 'Return-to-Zero (RZ)' coding.

Line Coding Techniques

• Bipolar Line Coding

  1. Bipolar NRZ:

     • The signal level alternates between positive and negative values for successive 1s.
     • Zero level for 0s.
     • More efficient use of bandwidth compared to unipolar line coding.

  2. Bipolar RZ:

     • Similar to Bipolar NRZ but returns to zero between each bit.
     • Provides a clearer timing for synchronization but requires more bandwidth.

• Polar Line Coding

  1. Polar NRZ:

     • Uses two levels of voltage, positive and negative, to represent binary 1 and 0.
     • Does not return to zero between bits, thus more bandwidth efficient.

  2. Polar RZ:

     • Similar to Polar NRZ but returns to zero between each bit.
     • Easier to synchronize but requires more bandwidth.

• Unipolar Line Coding

  1. Unipolar NRZ:

     • Uses a single non-zero voltage level to represent binary 1.
     • Zero voltage level represents binary 0.
     • Simplest form of line coding but can have DC component issues.

  2. Unipolar RZ:

     • Similar to Unipolar NRZ but returns to zero between each bit.
     • Easier to synchronize but requires more bandwidth.

Repository Structure

The repository is organized into the following directories and files:

• Bipolar

  • Bipolar_RZ.ipynb: Implementation of Bipolar Return-to-Zero (RZ) line coding.
  • Bipolar_NRZ.ipynb: Implementation of Bipolar Non-Return-to-Zero (NRZ) line coding.

• Polar

  • Polar_RZ.ipynb: Implementation of Polar Return-to-Zero (RZ) line coding.
  • Polar_NRZ.ipynb: Implementation of Polar Non-Return-to-Zero (NRZ) line coding.

• Unipolar

  • UNPolar_RZ.ipynb: Implementation of Unipolar Return-to-Zero (RZ) line coding.
  • UNPolar_NRZ.ipynb: Implementation of Unipolar Non-Return-to-Zero (NRZ) line coding.

References

• The concepts and explanations of the following article are used:

  • Line Codes for Communication Systems - Original Paper

• BOOK:

  • Computer Network Tanenbaum: This book has been used to teach the concepts of communication systems.

• You can also refer to the following file to know the performance of each of the implemented methods:

  • Line Coding

License

This repository is licensed under the MIT License. See the LICENSE file for more details.