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Department of Electrical Engineering Systems What is Systems? The study of mathematical and engineering tools used to analyze and implement engineering systems • Communications • Networks • SignalProcessing • Control History • A. G. Bell: scientist and inventor (telephone, Bell Telephone Co., communication devices) • T. Edison: inventor and businessman (electric light bulb, power distribution systems, media inventions) • H. Nyquist: engineer (stability of feedback amplifiers, sampling theorem) • C. Shannon: EE and mathematician (information theory, communications, sampling theorem) • J. Kilby: EE ( inventor of IC, precursor for development of signal processors and DSP) Communications ``Transfer and organization of information, of diverse media types and formats, through communication networks and channels ’’ IEEE Communications Society Networks ``A computer network is a system for communication among two or more computers. • Computer networks may be categorized with respect to range • Computer network applications may be categorized with respect to the functional relationships between components • Computer networks may be categorized with respect to network topologies • Computer networks may be categorized with respect to specialized functions’’ Wikipedia Signal Processing ``The theory and application of filtering, coding, transmitting, estimating, detecting, analyzing, recognizing, synthesizing, recording, and reproducing signals by digital or analog devices or techniques. “Signal" includes audio, video, speech, image, communication, geophysical, sonar, radar, medical, musical, and other signals’’ IEEE Signal Processing Society Controls ``The theory, design and application of Control Systems. It shall encompass components, and the integration of these components, as are necessary for the construction of such systems. The word `systems' as used herein shall be interpreted to include physical, biological, organizational and other entities, and combinations thereof, which can be represented through a mathematical symbolism’’ IEEE Control Systems Society EE Systems Curriculum • Core EE Classes – Tools Courses: • EE315 Signals and Systems • EE342 Probability and Statistics – EE341 Intro. to Communications • Core Systems Classes – EE351 Linear Systems and Control – EE415 Digital Signal Processing • Elective Classes Signal Representation Signals represent physical phenomena. Different ways of representing information from a signal. Time Domain Frequency Domain Signal Manipulation x(t) System y(t) Signals manipulated by passing them through systems • • • • • • Filtering Estimation Coding Transmission Extraction Conversion Analog to Digital Conversion Analog signal Continuous time Analog value Digital Signal A/D Sampler Quantizer Discrete time Analog value Discrete time Binary value Analog and Digital Signals Probability Application Recovery of Information Signals Many physical processes modeled by random phenomena • x(t) is input signal containing information. • y(t) is signal corrupted by random noise, distortion from channel, and interference from other information signals. • z(t) is output signal that gets estimate of information x(t). x(t) Channel Noise y(t) Receiver z(t) Receiver is designed using tools from probability, systems, and communications to optimize desired criteria (Signal to Noise Ratio, Probability of error) Digital Communications Systems Source Source Encoder Channel Encoder Transmitter Channel Destination Source Decoder Channel Decoder Receiver Multiplexing problem Time CDM Frequency TDM Frequency Frequency FDM Time Time Several information users share common channel. How to multiplex information FDM: analog signals, optical fiber (WDM) TDM: digital signals, cellular phones CDM: cellular phones, 3G Jobs in Systems Area • Telecommunications – AT&T, Cisco • Defense – Lockheed Martin, Boeing, Northrup Gruman, Raytheon • Computers – Microsoft, HP, Apple • Electronics – Motorola, Intel • Startups Homework Problem Pick one topic from below and use internet resources to write a short report ( 1 to 2 pages) on how systems technology will impact the following areas: • 3G communications • Sensor networks • Bioinformatics In your report please reference all web sites. - Define topic and why it is important - Key technological problems and how systems can help - Key players in area - Your interests in area