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Signals in Information and Communication Systems
Major: Hardware-software devices of information communication systems
Code of subject: 6.172.10.O.018
Credits: 4.00
Department: Theoretical Radio Engineering and Radio Measurement
Lecturer: Professor, Dr. Eng. Sc. Bohdan Volochiy
Semester: 3 семестр
Mode of study: денна
Завдання: The study of the educational discipline of the educational and professional program involves the formation of competencies in the students of education:
general competences: the ability to think abstractly, analyze and synthesize (ЗК-1) [form signal transformations, determine the requirements for signals taking into account the characteristics and parameters of the communication channels through which they must be transmitted]; the ability to apply knowledge in practical situations (ЗK-2) [determine the parameters of signals to match them with the characteristics of devices, communication channels]; ability to plan and manage time (ЗK-3); knowledge and understanding of the subject area and understanding of professional activity (ЗK-4); the ability to communicate in the state language both orally and in writing (ЗK-5) [for future professional activities knowledge and mastery of the terminology of radio technical signals]; the ability to work in a team (ЗK-6) [issuance of one version of the calculation task to two students, performing laboratory work by a team of two and three students] the ability to learn and master modern knowledge (ЗK-7) [develop additional literature]; the ability to system thinking (ЗK-13) [when making a decision to change the parameters of the time representation of a signal, one must take into account the associated change in the parameters of the frequency representation of this signal];
professional competences: the ability to use basic methods, methods and means of receiving, transmitting, processing and storing information (ФК-3) [understanding of methods of presenting information in the form of continuous and discrete messages, and thus converting them into digital signals and digital radio signals].
Learning outcomes: РН-1: Know the sequence of transformations of continuous and discrete messages for obtaining digital signals in information systems.
PH-2: Know the classification of radio technical signals (random, digital, deterministic, modulated), signs for classifications. Know the time representation (oscillogram) of radio technical signals.
PH-3: Know the parameters of radio technical signals and methods of their determination.
PH-4: Be able to construct mathematical models of continuous random signals (experiment and approximation).
PH-5: Know the relationship between the characteristics of time (oscillogram) and frequency (spectrum) representation of radio technical signals.
PH-6: Know the essence of the correlation characteristics of continuous random, deterministic and digital signals. Understand their purpose (their role) in information systems.
PH-7: Be able to justify the method of encoding source messages for the formation of digital signals (uneven and even codes).
Required prior and related subjects: Basics of the theory of probabilities and random processes
Basics of the theory of circles
Transmission of signals in information systems
Theoretical foundations of telecommunications
Telecommunication systems of information transmission
Summary of the subject: The concept of "information systems" is used in the name of the discipline because in radio engineering the object of study is radio engineering (radioelectronic) systems and complexes, and in telecommunications - telecommunication systems and networks. The concept of "information systems" unites and represents both radio engineering and telecommunication systems.
The program of the study discipline "Signals in information systems" is designed for students of the Institute of Telecommunications, Radio Electronics and Electronic Engineering who are studying in the specialty "Telecommunications and Radio Engineering". This discipline should form students' understanding of the characteristics of signals that provide reception, transmission, processing and storage of information in radio-electronic information systems.
On the example of a specific information system, namely the information transmission system, the types of random signals that are formed in the process of converting continuous and discrete messages into digital signals are shown. And for the transmission of digital signals through a communication channel, their conversion into digital radio signals is considered.
In this discipline, students study the features, characteristics, and parameters of random signals, deterministic periodic and non-periodic signals, digital signals, and signals formed by modulation of a carrier signal by digital and analog signals.
For the formation of digital signals, the task of choosing an appropriate method of encoding source messages between uneven and uniform codes and, accordingly, with different and the same number of binary pulses is shown. The method of selection is based on the connection between the uneven method of coding the source's messages and the informational parameters of the message source.
Signals are considered using physical and mathematical modeling.
Directions (ideas) for creating new signals are discussed.
Опис: Chapter 1. Getting to know the signals that ensure (accompany) the functioning of information systems.
Source of messages. Continuous and discrete messages. Conversion of messages into an electrical signal.
Random and digital signals. Transformation of a continuous-continuous random (analog) signal into a digital binary signal: representation of an analog signal by a sequence of counts, Kotelnikov's theorem, continuous-discrete random signal; quantization of continuous-discrete signal, discrete-discrete signal; conversion of a discrete signal into a digital signal; codes, code combinations.
Chapter 2. Random signals: characteristics, parameters, mathematical models.
Temporal representation of continuous random signals. Properties of continuous random signals. Probabilistic mathematical model of temporal representation of continuous random signals. Parameters of continuous random signals and their mathematical interpretation.
Autocorrelation characteristic of continuous random signals. A property of a continuous random signal is the existence of a dependence of its subsequent values on the current value. Quantitative assessment of the degree of such dependence using the autocorrelation characteristic. Correlation function in mathematics. Transferring this concept to continuous random signals. The method of obtaining the correlation characteristic of a continuous random signal.
Chapter 3. Deterministic periodic and non-periodic signals.
Temporal representation of deterministic periodic signals. Mathematical models of the time representation of a periodic sequence of rectangular pulses and a harmonic signal.
Frequency representation of deterministic periodic signals. Characteristics of the frequency representation of deterministic periodic signals. Mathematical apparatus for calculating the spectral characteristics of deterministic periodic signals. The spectrum width of a deterministic periodic signal.
Chapter 4. Digital signals. Methods of encoding source messages to form binary digital signals.
The concept of non-uniform and uniform coding of discrete source messages. The choice of the method of encoding source messages between uneven and even codes for the formation of binary digital signals. The connection of the non-uniform way of coding the source messages with the information parameters of the message source.
The number of binary pulses (bits) for each source message when forming code combinations of an uneven code. Bit characteristics and bit parameters of sources of discrete independent messages (provided at the output of the simple code encoder): the average value of the number of binary pulses (bits) per source message (entropy of the source) when using a non-uniform code; redundancy factor (percentage of redundant binary pulses (bits) when using a uniform code.
Discrete message source performance.
Correlation characteristics of digital signals.
Chapter 5. Radio signals. Signals formed by modulation of the carrier signal with digital and analog signals.
Amplitude modulation of the harmonic carrier (carrier). Mathematical model and parameters of the AM signal. Types of radio signals with amplitude modulation.
Angular modulation of the harmonic carrier (carrier). Phase and frequency modulation of a harmonic carrier.
Methods of modulation of a harmonic carrier (carrier) by a digital signal. Time and frequency representation of digital radio signals.
Methods of modulation of the pulse carrier (carrier). Time and frequency representation of signals with pulse carrier (carrier) modulation.
Assessment methods and criteria: Current monitoring of students' learning results is carried out using the virtual educational system of the university, in which there is a section "Current monitoring" on the website of the discipline "Transmission of signals in information systems". And also in practical and laboratory classes by checking and reviewing reports on completed individual tasks.
Semester control is carried out with the help of a virtual educational system, in which there is an "Exam" section on the website of the discipline "Transmission of signals in information systems". And also through an individual oral and written survey.
Критерії оцінювання результатів навчання: Current control:
Defense of project task No. 1 – 15 points
Defense of project task No. 2 – 15 points
Total current control – 30 points
Exam:
Written component – 60 points
Oral component – 10 points
Total for the discipline – 100 points
Recommended books: 1. Волочій Б.Ю. Передавання сигналів в інформаційних системах. Частина 1. – Львів: Видавництво Національного університету “Львівська політехніка”, 2005. – 194 с. Режим доступу: http://vns.lpnu.ua/course/view.php?id=13170
2. Волочій Б.Ю. Передавання сигналів в інформаційних системах. Конспект лекційних занять. – Львів: Національний університет “Львівська політехніка”, кафедра ТРР, 2022. Режим доступу:
http://vns.lpnu.ua/course/view.php?id=13170
Практичні заняття
3. Волочій Б.Ю. Передавання сигналів в інформаційних системах. Конспект практичних занять. – Львів: Національний університет “Львівська політехніка”, кафедра ТРР, 2022. Режим доступу:
http://vns.lpnu.ua/course/view.php?id=13170
4. Волочій Б.Ю., Озірковський Л.Д. Практикум з теорії електрозв’язку. – Львів: Видавництво Національного університету “Львівська політехніка”, 2010. – 116 с. Режим доступу: http://vns.lpnu.ua/course/view.php?id=1209
Лабораторні заняття
6. Волочій Б.Ю., Озірковський Л.Д. Практикум з теорії електрозв’язку. – Львів: Видавництво Національного університету “Львівська політехніка”, 2010. – 116 с. Режим доступу: http://vns.lpnu.ua/course/view.php?id=13170
Електронна адреса навчально-методичного комплексу дисципліни «Сигнали в інформаційних системах» у Віртуальній навчальній системі Львівської політехніки:
http://vns.lpnu.ua/course/view.php?id=13170