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EECPECS 796 Graduate Seminar Spring 2003

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Title: EECPECS 796 Graduate Seminar Spring 2003

1
EE/CPE/CS 796Graduate SeminarSpring 2003

Instructor Matthew Valenti
Date Jan. 37, 2003
Course Policies
Communications Research at WVU

2
Course Policies

Course web page
http//www.csee.wvu.edu/mvalenti/ee796.html
Check for seminar announcements.
You should read the syllabus.
Bring your own evaluation form to each seminar.
Can track your own attendance.
Tracking attendance.
Legally, I cant use your name or SSN.
Thus, you need to give me a Personal
Identification Number (PIN).
Can email it to me, or write it on your
evaluation sheet.
4-8 alphanumeric characters.

3
Number of Seminars

This class is graded U and S
To get an S you must attend and evaluate 10
seminars.
At least seven must be official i.e. during
this time slot or otherwise listed on course web
page.
I already have 9 official seminars lined up, and
there will be more to come.
Up to three may be outside seminars.
Must address a technical or professional topic.
If you give an outside seminar (for instance if
you present a paper at a conference), this counts
as 2 seminars.
You are encouraged to attend more than just the
minimum number of seminars.

4
Evaluating the Seminar

To get credit for attending a seminar, you must
turn in an attendance/evaluation form.
Available on the web.
Must turn in within 3 days of the seminar.
Can hand it in or email its contents to me.
Only email from your mix account will be valid.
Please dont disturb me outside of office hours
solely for the purpose of handing in your form.
Instead, you can leave it in my 8th floor
mailbox.
You must not turn in a form for a seminar you did
not attend.
This would be academic dishonesty and an honor
code violation.

5
Your Feedback is Important

The evaluation form asks you two things
Rate the quality of the presentation
Was it a good speaker?
Should we invite the speaker back next year?
Rate the usefulness of the seminar
Was it an important topic?
Do you want more seminars on this topic?
Note that we could end up with good speakers that
talk about unimportant topics or bad speakers
that talk about important topics.
Also, you are given the opportunity to suggest
topics for future seminars.

6
Etiquette

Please be on your best behavior.
The speakers are generally people that the
faculty are trying to work with.
e.g. faculty / post-doc candidates.
Current or potential research collaborators.
Some speakers from industry might even be in a
position to hire you.
Thus
Arrive on time and stay to the conclusion.
Dont eat or talk.
Pay attention Dont sleep, read, or do-homework.
Try to think of at least one question to ask the
speaker.

7
IEEE

The local IEEE subsection will be sponsoring many
of the speakers.
Subsection Upper Monongahelia, which is part of
the Pittsburgh Section of IEEE Region 2.
The IEEE is the professional organization for
Electrical (and Computer) Engineers.
Over 300,000 members largest in world.
I strongly encourage you to join (its easy).
Student dues are inexpensive.
25/year.
Benefits
IEEE Journals and Magazines at reduced rates.
Access everything electronically for 35/month.
Reduced conference rate.
Perpetual email address (e.g. valenti_at_ieee.org)
Job placement resources.

8
IEEE Attendance Sheet

When the IEEE sponsors a talk, we need to take
attendance.
This is not used for grading and is not a
substitute for your evaluation/attendance form.
Please fill it out, stating if you are an IEEE
member or not.
Keep the sheet moving make sure everyone has
signed it.
Make sure every professor in the room has signed
it (since they are generally IEEE members).
Why do we do this?
We pay for our speakers travel expenses using
money from the IEEE.
The more IEEE members that attend our seminars,
the more money we can ask for.
Therefore, the more IEEE members that attend and
sign the attendance sheet, the better the
speakers we can get.

9
Communications Research at WVU

General problem
Efficiently convey information from one (or more)
sources to one (or more) destinations.
Measures of efficiency
Energy/power.
Bandwidth.
Complexity.
Practical problems
Mitigating multipath fading.
Achieving diversity of time, frequency, and
space.
Interference mitigation and management.

10
Communications Research at WVU

The source and destination can be connected by a
direct path
Multiple source could communicate to the same
destination
Alternatively, the message could be routed
through multiple paths

Source
Destination
Source 1
Destination
Source 2
Source
Destination
11
Point-to-Point Communications

When communicating point-to-point, we want our
receiver to operate with a lower received signal
level (low SNR).
Less power means some combination of
Longer battery life at transmitter.
More distance between transmitter/receiver.
Smaller antennas at transmitter/receiver.
Less interference produced.
Power savings is primarily achieved by error
control coding.
Channel coding Insert redundant (parity)
information that can be used to detect/correct
errors at the receiver.

12
Power Efficiency of Channel Coding Standards
1.0
Spectral Efficiency
Code Rate r
0.5
0
1
2
3
4
5
6
7
8
9
10
-1
-2
Energy Efficiency
Eb/No in dB
13
Coding Research

Energy efficient codes
Turbo codes.
http//www.csee.wvu.edu/mvalenti/turbo.html
Low density parity check codes.
Space-time codes for fading channels.
Uses multiple transmit antennas
Efficient receiver implementation for fading
channels
Channel estimation
Synchronization Carrier, timing, frame.
Analog decoder architectures.
Valenti, Reynolds

14
Multiple-Access Communications

When there are multiple transmitters
communicating to the same receiver (base
station), interference becomes dominating factor.
Issues
Design of multiple-access signals and protocols
TDMA, CDMA (FH and DS), CDMA/CA.
Transmitter precoding.
Joint reception of multple-access signals
Multi-user detection.
Combined coding and detecion
Turbo multiuser detection.

15
Ad Hoc Networking