ECE4253 Digital Communications | |

Department of Electrical and Computer Engineering - University of New Brunswick, Fredericton, NB, Canada | |

This online tool draws and analyzes digital circuits to perform division and multiplication by a given polynomial in GF(2).

These circuits are particularly useful in digital communications as they provide the basis for data *scrambling* and *descrambling* operations. A serial data stream fed into the divider circuit will be scrambled in the division process and can be readily recovered by passing the scrambled data through the corresponding multiplier circuit. This process is also referred to as "randomization" and "derandomization".

Data scrambling circuits may be used to ensure that frequent transitions occur in a transmitted data stream. The defining polynomials would then be part of the standard describing a communications protocol.

Click on the circuit for full analysis

Circuit for division by: x^{3}+x+1

Circuit for multiplication by: x^{3}+x+1

Modulo 2 addition is shown schematically equivalent to Exclusive-OR gates. |

2021-04-17 05:20:18 ADT
Last Updated: 05-11-16 |
Richard Tervo [ tervo@unb.ca ] | Back to the course homepage... |