Telecommunication Systems II (Theory, TD602)

The course aims to introduce students to basic and advanced aspects of digital communications and to train them in digital techniques used in modern communication systems. The course is divided into individual sections that include converting the analog signal to digital, the basic concepts and design principles of a digital communication system, the transmission baseband, using line coding techniques, the look and combat the phenomenon of intersymbol interference, using digital modulation techniques (ASK / FSK / PSK), addressing the problem of synchronization in digital communications, high spectral efficiency techniques (QAM / OFDM) and the multiple access techniques (TDMA / FDMA / CDMA).

Objectives

Learning results Upon successful completion of the course, students will be able to: Knowledge level: 1. Describe clearly the individual systems of a digital communication system, their features and the functions they each perform. 2. Describe the individual steps of the analog signal conversion process in digital format and vice versa. 3. Describe the factors that affect the design of a digital communication system. 4. Describe the concept of transmission in the basic zone, the types of signaling protocols, the phenomenon of inter-interference interference and the solutions to address it. 5. Describe types of deformations and degradations from passing a signal to a communication channel. 6. Categorize the modulation techniques according to the information signal and the carrier, compare the analogue with the digital modulation techniques and describe the performance criteria of these techniques. 7. For each of the digital modulation techniques (ASK, PSK, FSK, QAM, QPSK, π / 4 PSK, etc.), they describe its operating principle, the bandwidth it requires, its spectral performance, constellation diagrams and Its endurance in a silent communication channel environment. 8. Describe the features and functions of the production and detection devices of digital configurations (ASK, PSK, FSK and their subclasses). 9. Describe the differences between technical compliance and non-compliant detection and explain the problem of synchronization in digital communications. 10. Explain the concept of orthogonality, the benefits it offers and its use in digital configurations. 11. Describe channel coding techniques (block encoding and convolutional encoding). 12. Describe the operating principle and the advantages and disadvantages of each of the FDMA, TDMA, CDMA and OFDM techniques. Skills level: 1. Calculate the values ​​of the parameters required for correct signal conversion from analog to digital, as well as calculate the rate of the generated information. 2. Calculate channel capacity (no noise, no noise) using the Shannon theorem. 3. Study the spectral characteristics of signaling protocols and compare the advantages and disadvantages of each protocol. 4. Apply solutions to address interpupillary interference and multipath propagation. 5. Calculate the spectral performance and the error rate of each of the digital configuration techniques (ASK, PSK, FSK, QAM, QPSK, π / 4 PSK, etc.) and compare them. 6. Calculate the required bandwidth for each of the digital configurations (ASK, PSK, FSK, QAM, QPSK, π / 4 PSK, etc.) for a given signal and communication channel. 7. Compare each other in terms of efficiency and complexity of carrier recovery techniques. 8. Compare the performance of M-form configurations between and specifically with reference to the theoretical limit of Nyquist 9. Compare channel coding techniques, ie block encoding, advanced encoding coding and TCM (Trellis Coded Modulation). At Skills level: 1. Associate power output, bandwidth, and data supply in a digital link. 2. Design elevated cosine filters to deal with inter-interference interference. 3. Plan and evaluate channel equalizers. 4. To diagnose problems in a digital communication using the eye chart. 5. Choose the appropriate digital configuration (between ASK, PSK, FSK, QAM, QPSK, π / 4 PSK, etc.) for given communication specifications (spectral performance, error rate, etc.). 6. Evaluate the operation of the production and detection circuits of each of the known digital configurations (ASK, PSK, FSK, QAM, QPSK, π / 4 PSK, etc.). 7. Design the configuration subsystem of a communication system based on one of the multiple access techniques (FDMA, TDMA, CDMA) 8. Design the configuration subsystem of a communication system based on the OFDM technique. 9. Design block codes, interleaving codes and Reed-Solomon codes. 10. Design Trellis diagrams 11. Design combined source, channel, and configuration coding systems as a whole system.

Prerequisites

Signals and Systems Telecommunications Systems I

Syllabus

Principles of designing a digital communication system. Convert analog signal to digital and vice versa. Sampling with delta pulses. Instant sampling Nyquist sampling theorem. Quantization. Codification. Pulse width modulation (PAM). Pulse duration modulation (PWM). Phase pulse modulation (PPM). Multiplexing of PCM signals. Multiplexing of TDM time signals. DPCM Differential Pulse Coding, DM Delta Modulation and ADM Adaptive Configuration. Broadcast digital data in the baseband. Pulse coding (line coding, Manchester etc). Interpolation interference. Noise and interference in digital communications systems. Digital configurations BPSK, DPSK, DEPSK, QPSK, 16QAM, FSK, MSK, π / 4DQPSK. Constellation diagrams. Spectral performance study and error rate. Frequency synthesis with PLL, DDS and a combination of these. Rectangular configurations (QPSK, MQAM), noise effect. Polytonic transmission techniques (FDM / OFDM, DMT). Multiple Access Techniques (FDMA / TDMA / CDMA).