Universidad de Jaén

The student will acquire knowledge about the characteristics of the digital transmission systems, the quantification process, the different classes of channel encoders, the types of multiplexing and spread-spectrum technicians.
Likewise, the student will simulate different blocks of digital transmission systems to the object to characterize its operation.

Keywords: digital transmission, quantification, Max-lloyd, LBG, decanal coding, linear codes, cyclic codes, crc, convolutional codes, viterbi algorithm, multiplexing, FDM, TDM, CDM, spread spectrum, direct sequence, frequency hopping, synchronization.

In addition, the student will be provided with the ability to be up-to-date with the latest developments in science and technology, especially in this type of subject, so linked to a dynamic environment such as telecommunications.
Below are the contents in the following sections:

THEORY AND PROBLEMS:

THEME 1: INTRODUCTION TO DIGITAL TRANSMISSION SYSTEMS
- Classification of Signals.
- Spectral density.
- Autocorrelation.
- Random variables. Stochastic processes. Stationarity Ergodicity
- The Digital Transmission System. Advantages and disadvantages. Quality measures
- Classification of Digital Transmission Systems.

ITEM 2: QUANTIFICATION
- Introduction to quantification.
- Classification of quantifiers.
- Quantification noise.
- Uniform quantification.
- Non-uniform quantification.
- Adaptive quantification.
- Vector quantification.

THEME 3: CODING OF WAVEFORM CHANNEL
- Antipodal and orthogonal signals. Cross correlation coefficient.
- Detection by correlation.
- Orthogonal codes.
- Biortogonal codes.
- Transorthogonal codes.

THEME 4: CHANNEL ENCODING OF STRUCTURED SEQUENCES
- Introduction
- Types of error control.
- Channel models.
- Coding and redundancy rate.
- Simple examples of codes with parity check.
- Coding gain.

UNIT 5: LINEAR BLOCK CODES.
- Introduction
- Algebraic approach to block codes.
- Generator matrix. Parity check Syndrome concept
- Detection and correction of errors.
- Known linear codes.
- Cyclic codes.
- Detection and correction of bursts errors.

THEME 6: CONVOLUTIONAL CODES
- Introduction
- Convolutional coding.
- Representation of a convolutional encoder.
- Algorithms of convolutional decoding. Viterbi algorithm.
- Detection and correction of errors with convolutional codes.
- Concatenated and interlaced codes.

ITEM 7: MULTIPLEXATION AND MULTIPLE ACCESS
- Introduction
- Multiplexing / multiple access by frequency division (FDM / FDMA).
- Multiplexing / multiple access by time division (TDM / TDMA).
- Comparison between FDM / FDMA and TDM / TDMA
- Multiplexing / Multiple access by code division

SUBJECT 8: TECHNIQUES OF SPECTERED SPECTRUM
- Introduction
- Characteristics of Spread Spectrum techniques
- Pseudo-random sequences
- Spread Spectrum Systems by direct sequence
- Spectrum widened by frequency hopping
- Synchronization
- Applications of the spread spectrum techniques

PRACTICES

The practical block of the subject consists of practices in the laboratory, and its character is mandatory.

The objective of the proposed practices is the achievement of the established competences. In addition, information, ideas, problems and solutions in the field of engineering and society in general will be developed through documentation delivery processes or oral presentations.

With regard to the organization of work, collaboration and teamwork will be encouraged through the design of the practices themselves.

The practical contents are the following:

Practice 1. Basic functions with MATLAB.
- Generation of signals of frequent use in communication systems.
- Calculation and representation of the autocorrelation function, power spectrum or energy.
- Obtaining parameters of the signals.
- Vector product.

Practice 2. Quantification.
- Implementation of a uniform quantifier.
- Characterization of the operation of the uniform quantifier according to its parameters (dynamic range, number of bits).
- Granular and overload error.
- Dependence of the signal-to-noise ratio as a function of the input signal.

Practice 3. Channel Coding
- Simulation of a digital transmission system with channel encoder.
- Evaluation of the error rate in channels with noise.
- Use of interleaver / de-interleaver

SEMINARS

SEMINAR 1. Entropic coding

A1 - Lectures in large group

The methodology to be followed in the lectures in a large group will be a mixture of introductory activities, master classes and the exhibition of theory and general examples in the classroom designated for the subject by the center. In addition to the exposition of the theoretical contents of the subject, the ability to collect and interpret data and handle complex concepts within the Engineering in Telecommunication Technologies will be developed and strengthened, in order to issue judgments that involve reflection on ethical and social issues.

 The student must follow the teacher's presentation with the material given for this purpose, either notes or slide presentation, which must be completed with their own notes and with the subsequent revision of the basic and / or recommended bibliography.

The attendance, as well as the active, respectful and responsible participation, either to raise doubts or to respond to the requirements or questions of the teacher, will be positively evaluated in its corresponding factor.

The student's autonomous work should focus on reviewing the concepts and theoretical aspects seen in the class, carrying out exercises, as well as studying them with the material provided by the teacher, student's notes and bibliography.

A2 - Lectures in small group

The work in the laboratory will focus on the development of the applications, or learning tasks designated by the teacher, which will culminate with the finalization of the client or server applications, the objective of the practice, which will continue, throughout the course, a project-based learning methodology.

Therefore, during the practice sessions, the design and implementation work of the applications marked by the different practices must be carried out fundamentally, in order to have the supervision of the professor. In addition, work will be encouraged in a collaborative environment, as well as mixing with the communication of results, with special emphasis on the need for continuous training of the activities related to telecommunications throughout their professional life independently.

The attendance, as well as the active, respectful and responsible participation, either to raise doubts or to respond to the requirements or questions of the teacher, will be positively evaluated in its corresponding factor.

Regarding the autonomous work, this will focus on the preparation of the documentation to be delivered of each practice, as well as on completing the work started in the laboratory and that could not be completed in the corresponding session.

A3 - Collective tutorials

The collective tutorials will be used in the resolution of doubts, monitoring and supervision of the works and exercises as well as in the attendance and participation to the different seminars planned in the subject, in addition to talks, conferences, workshops and / or conferences, designated by the teacher, in order to complete and update the training and obtaining general, transversal and / or specific skills defined for this activity, such as the value of continuing education, entrepreneurship or review of technological developments in the field.

Attendance, as well as active, respectful and responsible participation in the aforementioned activities, will be evaluated according to the provisions of the evaluation system of this guide.

Students with special educational needs should contact the Student Attention Service (Servicio de Atención y Ayudas al Estudiante) in order to receive the appropriate academic support

OVERALL EVALUATION

This assessment method is organised according to the activities described in the previous table. The evaluation process consists of:

- The evaluation of the tasks defined in the Teaching Guide during the Teaching period.

- A final Written Exam during the Examination period.

The assessment aspects evaluated in both parts and their contribution to the final mark are summarized in the following table:

Marks obtained during the Teaching period (as a record of the continuous evaluation process) will be kept until the end of the academic year.

Written Exam

The students have to make a Written Exam that assesses the theoretical and operating aspects of the subject (S2 and S3) at the end of the semester (at the date established in the examination period). This final evaluation is made to assess the extent to which the students have acquired all the competences and learning outcomes established for those aspects. The weight of this exam is the 50% of each of the evaluated aspects (S2 and S3).

Any books, notes, documentation, or equipment allowed for this Final Exam have to be approved by the lecturer.

Final assessment

The students must obtain a mark higher or equal to 4 (out of 10) in S4 to keep this evaluation method (Laboratory or computer practical work). The students will pass the subject through this evaluation method by getting a mark higher or equal than 5.0 out of 10 in the overall result (continuous evaluation and written exam), but with the condition of obtaining a mark higher or equal to 4.0 in the Written Exam and in S4.

The students can renounce to the Overall Evaluation at any time, but they cannot choose it again. Thus, they will be evaluated only by the FINAL EXAM method.

FINAL EXAM EVALUATION

This kind of evaluation is based in only one written exam that evaluates all the aspects of the subject, by assessing the students' acquisition of all the competences and learning outcomes established in the subject. This exam will take place during the Examination period on a date established by the centre. The final exam is weighted in the following way:

- Attendance and participation (S1), theoretical concepts (S2) and Exercises, problems and study cases (S3): 70%.

- Laboratory and computer practical work (S4): 30%.

In order to pass the subject, the student must have marks higher or equal to 5.0 out of 10 at each part of the final exam.

The students who have already fulfil the requirements of aspect S4 (Laboratory or computer practical work) through the OVERALL EVALUATION, by obtaining a mark higher or equal to 5.0 out of 10 do not have to make this part in the FINAL EXAM evaluation.

Those aspects successfully completed with a mark higher or equal to 5.0 will be considered passing during that academic year.

Using this approach, the following competences will be evaluated: CB4, CG3, CG9, C1, C4 y C5.
Obtaining a positive evaluation indicates that the student has reached the following learning results of the module: 1, 3, 4, 5, 6, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25.

The use of electronic devices in classes and exams is forbidden except that they are required for the right develoment of learning activities and always with the authorization of the lecturer.