ECE 461 - Spring 2020

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Course description: Reliable communication of one bit of information over three types of channels: additive Gaussian noise, wireline, and wireless. Emphasis on the impact of bandwidth and power on the data rate and reliability, using discrete-time models. Technological examples used as case studies.

Lectures: TR, 9.30am-10.50am, 3013 Electrical & Computer Eng Bldg.

Instructor: Prof. Juan Alvarez, alvarez@, 3046 Electrical & Computer Eng Bldg (ECEB), 300-5452.

Teaching Assistant: Grant Greenberg, gcgreen2@

Lecture Attendance Policy: We invite relevant questions and comments during lectures. Address your questions and comments to the entire class; avoid disruptive behavior such as talking to neighbors, unless the instructor invites you to form discussion groups. Kindly turn off or mute cell phones, laptop computers, and other electronic devices during lectures.

Course notes:

Prerequisite: The basic prerequisites are a probability course (such as ECE 313 or STAT 410) and some basic signal processing background (such as ECE 210).

Course Outline

Communication Systems are the basic workhorses behind the information age. Examples include high speed communication networks, wireless and wireline telephone systems, high speed modems, etc. The basic currency of information is digital: bits . Broadly speaking, this course is centered around a single theme: reliably communicate bits over an unreliable physical medium. The emphasis is on how to transfer this currency between a transmitter-receiver pair. The transfer involves a physical medium, whose input-output characteristics are not deterministically known. The curriculum has three broad parts:

• Channel Model : Even though the input-output relationship of the physical medium is not deterministically known, statistical quantities of this relationship, such as mean and correlation, can be physically measured and are typically constant over the time-scale of communication.
• Transmission and Reception Strategies : The statistical model of the physical medium is then brought into bearing in the engineering design of appropriate transmission and reception strategies (modulation and demodulation, in the language of this course).
• Design Resources and Performance : The resources available to the communication engineer are power and bandwidth . The final part of the course is to relate the statistical performance of the communication strategies to these two key resources.
These three parts are discussed in the course in the context of three specific physical media:
• Additive white Gaussian noise channel: The received signal is the transmit signal plus a statistically independent signal. This is a basic model that underlies the more complicated wireline and wireless channels.
• Telephone channel: The received signal is the transmit signal passed through a time-invariant, causal filter plus statistically independent noise. Voiceband v.90 modem and DSL technologies are used as examples.
• Wireless channel: The received signal is the transmit signal passed through a time-varying filter plus statistically independent noise. The GSM and 1xEV-DO standards are used as examples.

Office hours

Office hours (starting January 23, through May 4):

• Mondays, 2-3pm, ECEB 3036. (Prof. Alvarez).
• Mondays, 3-4pm, ECEB 3036. (Grant Greenberg).
• Thursdays, 3-4pm, ECEB 4036. (Grant Greenberg).
• Fridays, 2-3pm, ECEB 3036. (Prof. Alvarez). Jan 31 in rom 4036. No office hour on Feb 14.

Homework

 HW # 1 due: Tuesday, February 4 @ 10.50am solution

Written homework assignments will be posted above every other Tuesday (starting on 2/4) and will be due by 10.50m on Tuesdays on the due date by handing it to the instructor or by dropping it in box # 49 at the northwest corner of the 3rd floor next to the service elevator.

Late homework will receive no credit.

Your lowest homework grade will be dropped to account for possible sickness, travel or emergencies.

Homework format: Your homework assignment should be readable, clearly written. In the case it isn't, students will be penalized with reduction of points or zero credits. The header should be in the following format: left side up corner: course number, section, and semester; right side up corner: student name and netID; and in the middle HW # 1, #2, etc. See the following picture as an example:

Regrades: If you want to request a regrade of your homework, you must do so within a week of it being initially handed back during lecture (if you pick it up late you do not get an extension). To request a regrade, on a separate piece of paper, write why you think you should get more credit. Staple this paper to your homework and then hand it to the instructor.

Exams

Exams scheduled for these dates:

• Exam 1, Thursday, February 20, 9.30-10:50am, Location: ECEB 3013.

• Exam 2, Thursday, April 09, 9.30-10:50am, Location: ECEB 3013.

• Final, Monday, May 9, 7-10pm, Location: TBA.

There are no scheduled make-up exams. If you have an unavoidable medical or personal emergency, an exception might be granted. To be eligible for a make-up exam, you must notify the instructor (not the TA) before the scheduled starting time of the exam, and you must fully document your absence.

Students with documented disabilities must notify the lecture instructor at least two weeks before Exam 1.

Old exams

 Exam 1 Spring 2019 Spring 2016 Spring 2015 Spring 2014 Spring 2019 solution Spring 2016 solution Spring 2015 solution Exam 2 Spring 2019 Spring 2017 Spring 2016 Spring 2015 Spring 2014 Spring 2019 solution Spring 2017 Spring 2016 solution Spring 2015 solution Spring 2014 solution Solutions to additional problems Final Spring 2019 Spring 2017 Spring 2016 Spring 2015 Spring 2014 Spring 2019 solution Spring 2017 solution Spring 2016 solution Spring 2015 solution Spring 2014 solution Solutions to additional problems Solutions to more additional problems

It is the student's responsibility to check that the correct grades are entered in COMPASS2g. There will be no changes after a week past the lecture date when the corresponding hw, exam or quiz is returned (missing that lecture or not picking up the document does not extend the timeframe).

The final grade will be calculated as follows:

• Homework: 15%
• Exam 1: 25%
• Exam 2: 25%
• Final exam: 35%

Slides and additional resources per "Lecture" from the course notes.

We will follow the Lecture Notes on Digital Communication, Viswanath: pdf. Hardcopy available from the ECE Copy Room.