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 without memory

1.3 Modulation with 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 software MATLAB

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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

DETAILED INFORMATION:

Once the semester is finished, the student can choose between two kinds of evaluation: OVERALL or ONLY EXAM.

OVERALL EVALUATION

This kind of evaluation is organized using the activities described in the previous table.

The exam of the subject will evaluate the theoretical and operating parts (S2 and S3). The student must demonstrate to have acquired the subject competences. This final exam will be weighted as the 50% of the evaluated parts (S2 and S3). The exam does not include the practising part that is evaluated after finishing each practising. Students who have marks higher or equal to 5.0 out of 10 in the practising part of the OVERALL EVALUATION do not have to make the laboratory practising exam in the ONLY EXAM evaluation

In order to pass the subject, the following conditions must be fulfilled:

1)     The student must have a mark higher or equal to 4.0 out of 10 in the exam (S2 and S3 parts).

2)     The student must have a mark higher or equal to 4.0 out of 10 in the practising part.

3)     The student must have a global mark higher or equal to 5.0 out of 10.

The marks obtained in each part of the overall evaluation are valid during the same academic year.

The student can resign the overall evaluation at any moment, but from then, the kind of evaluation ONLY EXAM will be the chosen evaluation for the rest of the course.

ONLY EXAM EVALUATION

This kind of evaluation is organized in an only exam in which all parts of the subject are evaluated. The final exam is weighted in the following way:

-        S2 Theoretical concepts and S3 Exercises, cases and works: 70%.

-        S4 Laboratory practising: 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.

Those parts with a mark higher or equal to 5.0 are maintained during the same academic year.