175x Filetype PPTX File size 0.53 MB Source: uomustansiriyah.edu.iq
Course plan: 1-Introduction to communication systems, Signal analysis (System impulse response, band width, energy and power calculation. 2-Definition of modulation, types of modulation and reasons for modulation. 3-Amplitude Modulation (AM), definition, spectrum & power calculation. 4-Generation and detection of AM signals, tutorial. 5-Double side band DSB Generation and demodulation 6-Single side band SSB Generation and demodulation 7-Vestigial Side Band VSB Modulation generation and demodulation 8-Super Heterodyne AM Receiver and Introduction to angle modulation. 2 Lecture 1-1 Course plane: 9-Frequency Modulation (FM), Narrow and wideband FM, definition, bandwidth, spectrum and power. 10-Wideband FM, definition, bandwidth, spectrum and power. 11-Super Heterodyne FM Receiver, Stereo FM, Frequency Division Multiplexing (FDM). 12-Noise: mathematical representation, classification, power and spectral density. Thermal noise and additive white Gaussian noise. 13-Noise in Amplitude Modulation (Normal AM, DSB, SSB) communication systems, tutorial. 14-Figure of Merit and Noise in analogue communication systems, tutorial. 15-Noise Comparison of FM and AM, tutorial. 3 Lecture 1-1 References: 1- Bruce Carlson etl “An Introduction to Signals and Noise in Electrical Communication”, McGraw-Hill Companies, Inc., 2002. 2- John G Proakis and Masoud Salehi “Communication Systems Engineering”, Prentice-Hall, Inc., 2002. 3- Simon Haykin “Communication systems”, John Wiley and sons, Inc.,2001 4- Lloyd T. and Mitchel E. S., “Theory and problems of Electronic Communication”, Schaum’s outline Series, McGRAW-Hill, 1998. 5- B. P. Lathi, “Modern Digital and Analog Communication system”, Oxford University press, Inc., 1998. 4 Lecture 1-1 Introduction to Communication System What is communication? It's the process in which information is transfer from one point in space and time called the source to another point destination. What is a communication system? It's the group of mechanism that provides the information link between source and destination. What is the purpose of a communication system? The purpose of a communication system is to transmit information signals through a communication channel. Source: https://jooinn.com/communication- system.html Fundamentals of Communication system: Frequencies Frequency is measured in hertz (Hz), equivalent to cycles per second: thus 1 Hz is 1 c/s. The electromagnetic spectrum consists of frequencies from just above 0 Hz to ∞ Hz. The frequency spectrum is broken up into different segments which indicate the usage for particular frequency range as shown in table below. 5 Lecture 1-1 Introduction to Communication System Common Frequency ranges The frequency band of 20 Hz to 21 kHz is the total band that the human ear can hear. Types of Signal There are only two different types of signal that are processed, transmitted and received by telecommunication equipment. These are analogue and digital. Each type has individual characteristics. 6 Lecture 1-1
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