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.computernetworkcommunicationcomputers 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 Time Domain Frequency Domain Signals represent physical phenomena. Different ways of representing information from a signal.

Signal Manipulation Signals manipulated by passing them through systems Filtering Estimation Coding Transmission Extraction Conversion System x(t) y(t)

Analog to Digital Conversion A/D SamplerQuantizer Analog signal Digital Signal Continuous time Analog value Discrete time Binary value Discrete time Analog value

Analog and Digital Signals

Probability Application Recovery of Information Signals 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). ChannelReceiver Many physical processes modeled by random phenomena x(t) z(t) Noise y(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 Encoder Channel Transmitter Channel Encoder Source Decoder Receiver Channel Decoder Destination

Multiplexing problem Frequency Time FDM Frequency Time TDM Frequency Time CDM 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