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Unformatted text preview: ECE 5325/6325: Wireless Communication Systems Lecture Notes, Spring 2010 Lecture 11 Today: (1) Intro to Digital Communications • OH Fri 9-noon (J. Kemp), Mon 5-6pm (note the hour delay), Tue 9:30-10:30 • Today’s reading: Rap 6.4, 6.6, 6.7. Reading for Tue: 6.8-6.10 1 Course Project This course requires an individual project writeup and 10-15 minute presentation, in which you will further develop a topic of interest in the area of wireless communications systems (details provided separately). A wireless symposium will be held on Thu. April 22, between 3:40-7:40. You must present (10-15 minutes) and attend six other presentations during this symposium. 1.1 Topic Write a book chapter on a topic within wireless communications. Examples: a particular wireless standard, a type of fading, analysis of a particular type of wireless communication system and its per- formance, or another wireless communications or networking topic of interest (please ask if you have any questions). Emphasis should be given on the lessons learned from the study, not just the numbers describing the system / protocol. Why are particular choices made? How do you apply what you’ve learned in class? You will need to submit your topic to me via WebCT for ap- proval before starting. 1.2 Methods The topic must include a simulation (or experiment, or theoretical analysis). You will explain the methods you use in your simulation (or experiment or theoretical analysis) in your ”Methods” section. 1.3 Writeup • 7 pages, 1.5 line spacing, 11 point type, 1 inch margins. • minimum of four references (at least two conference or journal papers). Six references is A-level work. ECE 5325/6325 Spring 2010 2 • NO copying from any source. Any sentence which is para- phrased must be cited. • Sections: Introduction, Methods, Results, Conclusion, Refer- ences 1.4 Presentation • 10-15 minute slide presentation (powerpoint, beamer, ...) • Teach your topic to the students in attendence. • Use graphics to explain • Show and explain methods and results 2 Digital Communications: Overview My six word summary of digital communications: Use linear com- binations of orthogonal waveforms . 2.1 Orthogonal Waveforms My “engineering” definition of a set of orthogonal waveforms: They are waveforms that can be separated at the receiver. Def’n: Orthogonal Two real-valued waveforms (finite-energy functions) x ( t ) and y ( t ) are orthogonal if integraldisplay ∞-∞ x ( t ) y ( t ) dt = 0 Two complex-valued waveforms x ( t ) and y ( t ) are orthogonal if integraldisplay ∞-∞ x ( t ) y * ( t ) dt = 0 where y * ( t ) is the complex conjugate of y ( t ). Def’n: Orthogonal Set N waveforms φ 1 ( t ) ,... ,φ N ( t ) are mutually orthogonal, or form an orthogonal set, if every pair of waveforms φ i ( t ), φ j ( t ), for i negationslash = j , is orthogonal....
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This note was uploaded on 10/16/2011 for the course ELECTRICAL EE251202 taught by Professor Rejaei during the Spring '10 term at Sharif University of Technology.
- Spring '10