Universidad de Jaén

Next, the contents of the subject are detailed in the following sections:

Theory and Problems

1. Introduction of digital communications. Channel equalization. Development and analysis of digital communications techniques

1.1 Digital communication systems

1.2 Modulation using the concept of memory

1.3 Modulation not using the concept of memory

1.4 Channel equalization

2. Spread spectrum communications

2.1. Introduction

2.2. Spread spectrum systems

2.2.1. Direct sequence spread spectrum (DSSS)

2.2.2. Frequency Hopping spread spectrum (FHSS)

2.3. Sincronization

2.4. Pseudo-noise sequences (PN)

2.5. RAKE receiver

2.6. Code Division Multiple Access (CDMA)

3. Communications based on multicarrier transmission. Orthogonal Frequency Division Multiplexing (OFDM)

3.1. Introduction

3.2. Multicarrier systems

3.3. Mobile radio channels

3.4. Orthogonal Frequency Division Multiplexing (OFDM)

3.5. Coded Orthogonal Frequency Division Multiplexing (COFDM)

3.6. Standards in Communications: IEEE 802.11a, DVB-T, 802.16, LTE

4. Fundamentals of channel coding

4.1 Introduction

4.2. Convolutional codes

4.3. Reed-Solomon codes

  PRACTICES

Practice 1. Channel Equalization The aim of the first part of the practice is implementing a system based on the LMS algorithm and analyze its performance. The aim of the second part is to analyze and compare the performance of a M-PSK digital communication system when facing a channel having active simultaneously much noise as inter-symbol interference (ISI). The idea is that the students simulates three different scenarios (exclusively noisy channel, noisy channel without applying equalization and ISI noisy channel with ISI using equalizer).

Practice 2. Communications based on direct sequence spread spectrum (DSSS). The aim is implementing a multi-transmission system (CDMA) whose purpose is the analysis and evaluation of a digital communication system based on direct sequence spread spectrum

Practice 3. Communications based on multicarrier transmission using OFDM. The aim is to provide a complementary vision through practical simulations, the theoretical contents covered in class. In this way, the students improve their knowledge about the concept of orthogonal signals. Morever, the students can analyze the effects that occur in an OFDM system based on the parameters used.

SEMINARS

Seminar about the use and programming in the software MATLAB

A1. Lectures with big group of students

They are based in the explanation of the theory concepts, exercises and practical problems of the course.

A2. Lectures with practical groups

They are based on the explanation of the practical units in the lab including the execution by the students and resolution of problems in class.

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.

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

At the end of the semester, the student has to choose between two methods of evaluation: OVERALL EVALUATION or FINAL EXAM.

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: CB10, CB6, CB7, CB8, CB9, CE1, CG10, CG4, CG5, CG6, CG7, CG8, CG9, CT1, CT2, CT3, CT4, CT5, CT6 and CT7.
Obtaining a positive evaluation indicates that the student has reached the following learning results of the module: 13, 14 and 15.