455-0342/02 – Modulated Signals (MS)

Gurantor departmentDepartment of Measurement and ControlCredits6
Subject guarantorIng. Zdeněk Macháček, Ph.D.Subject version guarantorIng. Zdeněk Macháček, Ph.D.
Study levelundergraduate or graduateRequirementCompulsory
Year2Semesterwinter
Study languageCzech
Year of introduction2004/2005Year of cancellation2008/2009
Intended for the facultiesFEIIntended for study typesFollow-up Master
Instruction secured by
LoginNameTuitorTeacher giving lectures
MAC37 Ing. Zdeněk Macháček, Ph.D.
NEV10 prof. Ing. Pavel Nevřiva, DrSc.
Extent of instruction for forms of study
Form of studyWay of compl.Extent
Full-time Credit and Examination 2+2
Combined Credit and Examination 2+2

Subject aims expressed by acquired skills and competences

The course deals with the basic analog and digital bandpass signaling techniques. These are applicable to both the analog and digital communication systems. Next students study basics of the digital signal processing. Amplitude analog modulations and the angle analog modulations schema and algorithms are presented (AM, DSB-SC, SSB-SC, PBSK, PM and FM signals). Digital modulations and their algorithms are presented (OOK, ASK, PSK, FSK, QAM, APSK). Theoretical lectures are followed by the laboratory seminars.

Teaching methods

Lectures
Individual consultations
Tutorials
Experimental work in labs
Project work

Summary

The course Modulated Signals and the Bandpass Signaling is closely related to the courses Signals and Systems, Fundamentals of Signals and Systems Theory and Digital Signals and Systems. It is appointed for students and professionals in electrical engineering, measurement, control, informatics and communications. Student will master the mathematical description and representation of bandpass waveforms and systems, will be acquainted with the basic bandpass signaling techniques. These are applicable to both the analog and digital communication systems. Amplitude analog modulation and the angle analog modulation schema are presented (AM, DSB-SC, SSB-SC, PBSK, PM, FM and NBFM signals). Digital modulations of bandpass signals are presented too (OOK, ASK, PSK, FSK, QAM, APSK). The knowledge of mathematics in the extent of the obligatory mathematical course at VŠB TU Ostrava, FEI, is the preliminary for the study of the course. Basics of physics and electrical engineering are useful. The command of the preliminary classes Signals and Systems, Fundamentals of Signals and Systems Theory and Digital Signals and Systems is assumed. The course Modulated Signals and the Bandpass Signaling deals with a rather large thema in an one-semester course. The physical meaning of the mathematical representation of the signals and systems is always discussed. For the mathematical development of some formulas describing the communication process from the statistical viewpoint is student referred to the literature.

Compulsory literature:

Couch L.W.II: Modern Communication Systems. Prentice Hall, New Jersey, 1994. Couch L.W.II: Digital and Analog Communication Systems. Prentice Hall, New Jersey, ISBN 0-13-089630-6, 2002. Chen Chi-Tsong: System and Signal Analysis. Saunders College Publishing, New York 1994.

Recommended literature:

Nevřiva,P, Macháček Zdeněk.:Modulated signals. Sylabs at WWW pages of department and at server D400,2006-2008

Way of continuous check of knowledge in the course of semester

Verification of study: Student must work out two laboratory works. The first one is related to the analysis of the discrete-time signal, the second one is related to the analysis of the discrete-time system. Student can receive up to 10 points for each of works. Maximum number of points student can gain through tests is 2 * 10 = 20 points. Student has to elaborate one test. Student can acquire up to 20 points for it. Student can gain up to 20 + 20 = 40 points from the laboratory excercices. To pass the course student has to pass both the laboratory part of the course and the final exam. the Final exam consists of writing part 0 - 50 points and oral part 0 -10 points. Student have to succeed in all parts of examination. Conditions for credit: Student must work out two laboratory works and one test. To pass the laboratory part of the course student has to gain at least 15 points from the laboratory excercices

E-learning

Další požadavky na studenta

Prerequisities

Subject has no prerequisities.

Co-requisities

Subject has no co-requisities.

Subject syllabus:

Lectures: Introduction: Modulated Signals and the Bandpass Signaling, the classification and the content of the course. Coherence of the theme to the courses Signals and Systems I and Signals and Systems II. Mathematical representation of the bandpass waveforms. Basic definitions. Complex envelope representation. Representation of modulated signals. Bandpass signal filtering. Fourier transform of a bandpass signal. Equivalent baseband filters. Distortionless transmission. Transfer characteristics of a distortionless bandpass channel. The group delay and the phase delay. Bandpass dimensionality theorem. The sampling theorem for the bandpass waveform. Bandpass dimensionality theorem for nonuniformly spaced time samples of the waveform. Standard modulations. Spectrum of bandpass signals. PSD of standard bandpass signals. Evaluation of power. Components of of bandpass systems 1. Filters. Components of of bandpass systems 2. Amplifiers. Limiters. Components of of bandpass systems 3. Mixers. Detectors. Envelope detector. Product detector. Frequency modulation detector. IQ detektor. Components of of bandpass systems 4. Phase locked loops. An analog PLL and a linear model of the analog PLL. AM signal detection using a PLL. Transmitters and receivers. Transmitter. Receiver. The Superheterodyne Receiver. Amplitude Modulation. AM signals. Power of an AM signals. AM signals and the noise. The AM efficiency. DSB-SC signals. SSB signals. Angle modulation 1 FM signals and PM signals. Representation of angle-modulated signals. Representation of FM and PM signals. Angle modulator circuits. Angle modulation 2. FM and PM signal with sinusoidal modulation. Spectra of angle modulated signals. Narrowband angle modulation NBFM. Computer labs: The introductory laboratory lecture. The project of the laboratory communication system. The assignment of the laboratory tasks. Bandpass signals Matematical representation of a bandpass signal. The model verification by the measurement of signal parameters. Bandpass signal filtering. Equivalent baseband filters. Measurement of the filtered signal parameters. Distortionless transmission. Amplifiers. Measurement of an amplifier fequency response. Measurement of group delay and the phase delay of a bandpass signal. The sampling theorem. The sampling theorem for the bandpass waveform. Measurement and simulation. Amplitude modulation. AM Signals. Representation of AM signals. AM signal analysis in the time domain and in the frequency domain. Spectra of AM signals. Power of AM signals. The percentage of modulation. The AM efficiency. DSB-SC signals. SSB signals. Measurement of parameters of AM signals and DSB-CS signals. Angle modulation. FM signals and PM signals. Representation of angle-modulated signals. Representation of FM and PM signals. FM and PM signals analysis in the time domain and the frequency domain. Spectra of angle modulated signals. Power of FM and PM signals. FM and PM signal with sinusoidal modulation. Narrowband angle modulation . Wideband frequency modulation. Measurement of parameters of NBFM and WBFM signals. TEST No.1 Components of of bandpass systems 1 Filtrs. Construction types. Elements of filters. Filter application. Optimization criterion. Design and measurement of selected parameters. Measurement of transfer characteristics for the equivalent low-pass filter. Components of of bandpass systems 2 Amplifiers. Limiters. Design and measurement of selected parameters. Components of of bandpass systems 3 Mixers. Detectors. Measurement of selected parameters. Envelope detector. Product detector. IQ detektor. Design and measurement of selected parameters. Components of of bandpass systems 4 Phase locked loops. AM signal detection using a PLL.Design and measurement of selected parameters. Transmitters and receivers. The AM broadcast superheterodyne receiver. TEST No.2. Student has to elaborate two laboratory works, that consist of both theoretical and practical part. Each laboratory work is divided into three two-hour units. Student is bounded to compile the written report on both of his laboratory works. The presumed extent of the report is about eight pages. The written report on the first laboratory work is a precondition for the successive student´s second laboratory work. Laboratory works 1 Measurement of AM signal parameters. Mathematical representation of AM signal. Spectra of AM signal. Power of AM signals. The percentage of modulation. The AM efficiency. Measurement of parameters of AM signals. 2 Measurement of FM and PM signal parameters. Mathematical representation of FM and PM signals. Spectra of angle modulated signals. Power of FM and PM signals. FM and PM signal with sinusoidal modulation. Narrowband angle modulation. Measurement of parameters of NBFM signals.

Conditions for subject completion

Full-time form (validity from: 1960/1961 Summer semester)
Task nameType of taskMax. number of points
(act. for subtasks)
Min. number of points
Exercises evaluation and Examination Credit and Examination 100 (100) 51
        Exercises evaluation Credit 30 (30) 0
                Laboratory work Laboratory work 30  0
        Examination Examination 70 (70) 0
                Written examination Written examination 50  0
                Oral Oral examination 20  0
Mandatory attendence parzicipation:

Show history

Occurrence in study plans

Academic yearProgrammeField of studySpec.FormStudy language Tut. centreYearWSType of duty
2006/2007 (N2645) Electrical Engineerong, Communication and Computer Systems (2612T041) Control and Informatics Systems P Czech Ostrava 2 Compulsory study plan
2006/2007 (N2645) Electrical Engineerong, Communication and Computer Systems (2612T041) Control and Informatics Systems K Czech Ostrava 2 Compulsory study plan
2005/2006 (N2645) Electrical Engineerong, Communication and Computer Systems (2612T041) Control and Informatics Systems P Czech Ostrava 2 Compulsory study plan
2005/2006 (N2645) Electrical Engineerong, Communication and Computer Systems (2612T041) Control and Informatics Systems K Czech Ostrava 2 Compulsory study plan
2004/2005 (N2645) Electrical Engineerong, Communication and Computer Systems (2612T041) Control and Informatics Systems P Czech Ostrava 2 Compulsory study plan
2004/2005 (N2645) Electrical Engineerong, Communication and Computer Systems (2612T041) Control and Informatics Systems K Czech Ostrava 2 Compulsory study plan

Occurrence in special blocks

Block nameAcademic yearForm of studyStudy language YearWSType of blockBlock owner