Lecture_Notes_01 - University of Toronto ECE316 Fall 2011...

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Unformatted text preview: University of Toronto ECE316 Fall 2011 CommunicaƟon Systems September 9, 2011 L¡¢ãçÙ¡ NÊã¡Ý #1 Instructor: Ivo Maljević 1 CommunicaƟon System A block diagram of a typical communicaƟon system is shown in Figure 1. The details of any speci£c communicaƟon systems di¤er, but the most important (common) funcƟonal blocks are present in this block diagram. The source and the desƟnaƟon are the end points in the communicaƟon system chain. When the data generated by the source are non-electric, an input transducer converts them into an electrical signal(also known as the message signal), while an output transducer performs the opposite operaƟon. Figure 1: CommunicaƟon system block diagram Message signal (point "A") carries the informaƟon intended for the desƟnaƟon/user. TransmiƩer converts the message signal into a transmiƩed signal (point "B"). This new signal is beƩer suited for transmission over the channel. Channel is the transmission media between the transmiƩer and receiver (e.g., air for radio waves, cables for wired communicaƟons, etc.) As the signal travels through the channel, it gets distorted. Also, noise and interference are added to the signal, making the process of signal recovery more difficult. Receiver recovers the message signal from the received signal (point "C") up to a degree; that is why we call the recovered signal (point "D") an esƟmate of the message signal (point "A"). The purpose of communicaƟon systems is to carry informaƟon from the point of origin (source) to its desƟnaƟon. The flow of informaƟon can be in one direcƟon, in which case we have a broadcast system , or in two direcƟons, which is known as point-to-point communicaƟon. 1.1 Outline Some of the most important yet very basic mathemaƟcal tools for the Ɵme domain analysis of the electrical signals used in communicaƟon systems (energy/power, vector representaƟon, classi£caƟon, Fourier series expansion, etc.) will be introduced in Chapter 2 ....
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Lecture_Notes_01 - University of Toronto ECE316 Fall 2011...

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