Introduction to Digital Communications
EE 360K, Unique 16665, Fall 2010
Professor Ted Rappaport
TTH 11:00 AM – 12:30 PM
ENS 126
Announcements
 HW 5 due date has been moved to Oct. 19
 HW 6 Assigned on Oct. 14 is due on Oct 26, Exam 2 will be held Nov 4.
 I need to cancel office hours for Monday Nov 1.However, I want to provide extra hours to help you prepare for Exam 2, and will thus hold office hours from 2pm to 5pm on Tuesday, Nov. 2. If the crowd gets too big, we will move to ENS 637, and I will post a note on my door. Feel free to come in and ask anything you wish from 2pm to 5pm on Tuesday, Nov 2 (and don’t forget to vote that day, too!).
 Hw 8 due date changed to Nov. 18
 Final ExamFriday, December 10, 2 5 PM
ENS 116
Class Information
Course Objective
To provide students with a thorough working knowledge and ability to analyze, design, and solve engineering problems in the following topics: communication channels and their impairments; modulation; demodulation; probabilityoferror analysis; source coding; error control coding; link budget analysis; equalization; synchronization and multiple access; spread spectrum; applications in wireline and wireless communication systems.
Prerequisite
Biomedical Engineering 335 or Electrical Engineering 351K with a grade of at least C.
Instructor Information
Instructor: Dr. Ted S. Rappaport
Office Location: ENS 433A
Office Hours: Mondays and Wednesdays, 3:00 – 4:30 PM
Wednesday Night Help Session: 5:00 – 6:00 PM, ENS 637
Required Text
Digital and Analog Communication Systems, 7th Edition
Leon W. Couch II
Prentice Hall, 2006
ISBN 9780131424920
Grading
Homework will be due at the beginning of class – no exceptions.
 Homework ………………… 15%
 3 Exams (each at 20%) … 60%
 Final Exam ………………… 25%
Although plus/minus grades will typically not be assigned for the final grade in this course, in some instances, plus/minus grades may be issued. Attendance is not specifically calculated as part of your grade, but regular attendance is required to maintain a firm grasp of the material and to do well in this course. I will consider your regular attendance favorably in determining your final grade if you are on the borderline.
Students with disabilities may request appropriate academic accommodations from the Division of Diversity and Community Engagement, Services for Students with Disabilities, 4716259.
By UT Austin policy, you must notify me of your pending absence at least fourteen days prior to the date of observance of a religious holy day. If you must miss a class, an examination, a work assignment, or a project in order to observe a religious holy day, you will be given an opportunity to complete the missed work within a reasonable time after the absence, provided you have recieved prior approval from Prof. Rappaport at least 14 days in advance.
Book Errata
There is a typo in the Table B1, on page 680, for the Poisson Distribution.
The Poisson PDF should have a delta function that is a function of (x – k). Unfortunately, the typo shows the delta function as (xk), which makes no sense.
Please correct this in your book!
Homework Assignments
 Assignment 1: Assigned 8/26; Due 9/2: Problems 11, 14, 1.6, 17, 115 (for Part C, assume that transmission and reception split the available bandwidth equally), 21, 22, 24, 25, 27, 214 Hw 1 Solutions
 Assignment 2: Assigned 9/2; Due 9/9: Problems 2.12, 2.15, 2.17, 2.18, 2.19, 2.21, 2.24, ,2.32, 2.34 (use Matlab), 2.38, 2.43, 2.44, 2.46 (Let θ_{2}=0°), 2.48, 2.75
HW 2 Solutions
 Assignment 3: Assigned 9/9; Due 9/16: Problems 2.74, 2.83, 2.86, 2.91, B4, B5, B7, B10, B12 HW 3 Solutions
 Assignment 4: Assigned 9/30; Due 10/7: Problems B18, B20, B23, B25, B29, B36, B38, B39, 61, 65,66, 67, 68, 69 (Interesting property), 6.11, 6.20, 6.23, 6.26 (where the signal is the sine wave) HW 4 Solutions
 Assignment 5: Assigned 10/7; Due 10/19: Problems 627, 633, 639, 641, 41, 436, 437, 438, 439, 440 HW 5 Solutions
 Assignment 6: Assigned 10/14; Due 10/26: Problems: 431, 433, 434, 51, 55, 57, 512, 513, 520 HW 6 Solutions
 Assignment 7: Assigned 10/26; Due 11/2: Problems: 522, 523, 524, 527, 558, 337, 342, 345, 347 HW 7 Solutions
 Assignment 8: Assigned 11/9; Due 11/18: Problems: 556, 557, 558, 563, 5.77, 3 34, 345, 346, 359, 361 HW 8 Solutions
 Assignment 9: Assigned 11/18; Due 11/24 (by 5pm): Problems: 6.47, 6.50, 7.1, 7.2, 7.4, 7.7, 7.9, 7.14 HW 9 Solutions
 Exam 3: Assigned 11/23; Due 12/3 (by 2pm) Exam 3 here
Lecture Notes
 August 26
 August 31
 September 2
 September 7
 September 9
 September 14
 September 16
 September 21
 September 30
 October 5
 October 7 – Notes by Felix
 October 12
 October 14
 October 19
 October 21
 October 26
 October 28
 Nov 2
 Nov 9
 Nov 11
 Spread Spectrum and Digital Communications Primer” by T. Rappaport, 1985
 Nov 16
 Nov 18
 Nov 23
 Nov 30
 Dec 2
Exam Solutions
Honor Policy
Faculty in the ECE Department are committed to detecting and responding to all instances of scholastic dishonesty and will pursue cases of scholastic dishonesty in accordance with university policy. Scholastic dishonesty, in all its forms, is a blight on our entire academic community. All parties in our community — faculty, staff, and students — are responsible for creating an environment that educates outstanding engineers, and this goal entails excellence in technical skills, selfgiving citizenry, and ethical integrity. Industry wants engineers who are competent and fully trustworthy, and both qualities must be developed day by day throughout an entire lifetime. Scholastic dishonesty includes, but is not limited to, cheating, plagiarism, collusion, falsifying academic records, or any act designed to give an unfair academic advantage to the student. Penalties for scholastic dishonesty are severe and can include, but are not limited to, a written reprimand, a zero on the assignment/exam, retaking the exam in question, an F in the course, or expulsion from the University. Please do not jeopardize your career by an act of scholastic dishonesty. Details about academic integrity and what constitutes scholastic dishonesty can be found at the website for the UT Dean of Students Office and the General Information Catalog, Section 11802.
Syllabus and Exam Dates (subject to change)
Please refer to and update this syllabus in your browser regularly.
Date  Topic  Reading Assignments  Important Class Events 

8/26  Introduction, MATLAB, Comm Systems, Information Theory, Entropy, Codes, Shannon’s Band  pp.130  
8/31  Intro to dB, Data Rate, Fourier Transform, Signal Properties  pp.3358, Appendix B  
9/2  Signal Properties, dB, Fourier Transform Review, Rect, Tri FT, Convolution  pp. 3357; Appendix A & B  HW1 Due Beginning of Class 
9/7  Convolution, PSD, Autocorrelation, Orthogonal Series, FS  pp.5879; Appendix A & B  
9/9  Linear Systems, Distortion, ISI, Impulse Sampling, Dimensionality  pp.7993, pp.110114  HW 2 Due Beginning of Class 
9/14  DFT, BW of Signals, Spectrum Masks  pp.94114; Appendix B  
9/16  Probability and Random Processes, Ensemble Averages, Moments  Appendix B; pp. 664679  HW 3 Due Beginning of Class 
9/21  Distributions, Gaussian Q Function, Central Limit Theorem, Multivariate  Appendix B; pp.679700  
9/23  Exam 1 in class, closed book, one doublesided crib sheet allowed  Exam 1 covers from first day of class  
9/28  Stochastic Process, Ergodicity vs. WS Stationary, PSD, ACF, WK, PSD of Digital Signals  pp. 679700 pp. 397420 

9/30  Stochastic Process, Ergodicity vs. WS Stationary, PSD, ACF, WK, PSD of Digital Signals  pp. 679700 pp. 397420 
HW 4 Due Beginning of Class 
10/5  Complex Env., Bandpass, PSD for Random Processes, Gaussian Noise  pp.230244, pp.420447  
10/7  Complex Envelope, Additive White Gaussian Noise, Cross Correlation, WSS Bandpass Signals  pp. 230244 pp. 404447 

10/12  Superhetrodyne Receivers, Image Frequencies, Sampling, Detectors, Mixers, Components, Harmonic Distortion, AM/FM  pp. 244295  
10/14  AM, SSB, VSB, Analog Modulation  pp. 302318  
10/19  FM, Angle Modulation, Frequency Division Multiplexing (FDM)  pp. 319339, pp. 290295  HW 5 Due Beginning of Class 
10/21  Digital Modulation, Frequency Division Multiplexing (FDM)  pp. 339352  
10/26  OOK, BPSK, MPSK, QPSK, QAM, pi/4 QPSK, Nyquist Filters, Raised Cosine – no ISI  pp. 180188, pp. 352361  HW 6 Due Beginning of Class 
10/28  Spectral Efficiency, Raised Cosine Filters, MSK, OFDM  pp. 361372  
11/2  Spread Spectrum, DS, Minimum Length Sequences  pp. 372383  HW 7 Due Beginning of Class 
11/4  Exam 2 in class, closed book, two doublesided crib sheets allowed  Exam 2 covers from Exam 1  
11/9  Digital Baseband signaling, Quantization, PCM, Quantization noise, Spread Spectrum, DS, Minimum Length Sequences  pp. 128147 pp. 372383 

11/11  Digital line Codes, RZ, NRZ, Spectrum, Quantization Error  pp. 152180  
11/16  Time Division Multiplexing, the Modern Digital Phone System, PCM, SNRQ  pp. 199220  
11/18  The Matched Filter, Optimizing Performance in Noise, Bit Error Rates and SNR for Digital Baseband Modulations  pp. 447488  HW 8 Due Beginning of Class 
11/23  BER for Coherent Bandpass Binary Modulations Phone System, Non Coherent Detection and BER for Binary Bandpass Signals, BER for BPSK, QPSK, MSK, MPSK  pp. 488508 Exam 3 handed out in class 
HW 9 Due 5PM, on Wed, 11/24 
11/25  No Class – Thanksgiving Break  
11/30  Comparing Systems to Shannon’s bound, Real Systems  pp. 514542, pp. 552592  
12/2  Link Budget, Noise Figure, Final Exam Review  pp. 514542, pp. 552592  
12/3  Turn in Exam 3  2PM, Due ENS 433  
12/10 25pm 
Final Exam, closed book, three doublesided crib sheets allowed  All to date  ENS 116 
INSTRUCTOR INFORMATION
Instructor: Dr. Ted S. Rappaport
Office Location: ENS 433A
Office Hours: Mondays and Wednesdays, 3:00 – 4:30 PM
Wednesday Night Help Session: 5:00 – 6:00 PM, ENS 637
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