## Introduction to Coding Theory

*Lectures*: Vitaly Skachek,
office hours: Ülikooli 17-224, Monday 10:15-12:15, or by appointment *Practice*: Eldho K. Thomas, office hours: Ülikooli 17-225, Wenesday 14:00-16:00, or by appointment

Language of instruction: English

### Schedule

Lectures: | `Thr 16.15-17.45` | `Ülikooli 17-219 (Paabel 219)` |

Practice: | `Fri 14.15-15.45` | `Ülikooli 17-220 (Paabel 220)` |

### Final exam

Exam January 17, 2020

Exam January 3, 2020,
Solutions

The final exam will take place on January 3rd and on January 17th, both at 14:00-17:00 in room J. Liivi 2-206.

You can use any hand-written or printed material. No electronic devices (no computers, no tablets, no phones, etc.) are allowed in the exam.

### Announcements

`There are no classes on December 19th and December 20th.`

Old announcements:

- There will be no practice session on Friday, October 11th.
- Change of room due to the Institute Day on October 3rd: the lecture will take place in J. Liivi 2, room 206.
- There will be no lesson on Friday, September 20.
- On Thursday, September 19, there will a practice session lesson instead of a lecture (covering topics related to finite fields).

### About the course

- How is a compact disc protected from scratches?
- How polynomials can help to keep a secret?
- How to send more bits over the network link that link can carry?

We will answer these and other questions. The course is dealing with mathematical methods and algorithms for reliable transmission and storage of information. The main object under consideration is an error-correcting code, which is typically a set of vectors equipped with certain properties. The discussed methods make use of linear algebra and finite fields. Only knowledge of linear algebra (introductory course into linear algebra) is assumed. All necessary mathematics will be explained in the course.

### Prerequisites

- Linear algebra or equivalent course
- Interest in application of mathematics to computer science and engineering

The course is suitable for all levels: Bachelor, Master and Ph.D. The basic knowledge of linear algebra is assumed (linear transformations, vectors spaces, solving systems of linear equations). Beyond that, all necessary mathematical background will be explained in the course. However, knowledge of basics in probability theory, discrete mathematics and finite fields can be helpful.

### Preliminary syllabus

Lecture 1 | communications model; BSC and BEC channels; code and its parameters. |

Lecture 2 | ML and nearest-neighbour decoding; examples of simple codes; Shannon theorems. |

Lecture 3 | correction and detection of errors; correction of erasures. |

Lecture 4 | linear codes; generator matrix; parity-check matrix. |

Lecture 5 | construction of finite fields; primitive elements. |

Lecture 6 | parity-check matrix; dual code; Hamming code. |

Lecture 7 | extended Hamming code; concatenated code; syndrome decoding. |

Lecture 8 | Singleton bound; sphere-packing bound; Gilbert-Varshamov bound. |

Lecture 9 | asymptotic bounds; Reed-Solomon codes; Vandermonde matrix. |

Lecture 10 | generalized Reed-Solomon codes; GRS codes as cyclic codes. |

Lecture 11 | decoding of GRS codes; key equation; Peterson-Gorenstein-Zierler decoding algorithm. |

Lecture 12 | solving key equation by using extended Euclid's algorithm. |

Lecture 13 | finding error values by using Forney's algorithm; summary of decoding of GRS codes; example. |

Lecture 14 | NP-hardness of nearest-neighbour decoding; LDPC codes. |

### Literature

- R.M. Roth,
*Introduction to Coding Theory*, Cambridge University Press, 2008 (the course mainly follows parts of this book; available in UT library) - F.J. MacWilliams, N.J.A. Sloane,
*The Theory of Error-Correcting Codes*, North-Holland Publishing Company, 1977 (newly published copy is available in UT library) - J.H. van Lint,
*Introduction to Coding Theory*, Springer 1999

### Final grade structure

- Homework assignments: 60%
- Final exam: 40%

Final exam will be open-book, i.e. any printed or written materials allowed but no electronic devices.

### Previous exams

##### :Final exam December 14th, 2018

##### Final exam January 24th, 2018:

##### Final exam December 28th, 2016:

##### Final exam June 8th, 2015:

##### Final exam June 10th, 2014:

### Last year

You might also be interested in the last year course page.