ECE 5325 – Wireless Transmission Systems

Note: This schedule may be adjusted throughout the semester. Watch the web for changes.

Portfolios are due each week by Monday night.  If they are not in the homework locker when the grader collects them Tuesday morning, they will receive no points. They will primarily be checked for completeness rather than correctness.  You are responsible for checking the accuracy of your solutions to textbook problems using the solution manual available in the ECE office.  A small part of each assignment will also be graded for accuracy and will generally come from exercises not available in the solution manual.  Solutions will be posted on Tuesday for any problems not available in the solutions manual.  Homework problems will be closely related to exam problems, so make sure you check your work.  Your lowest portfolio score will be dropped.

If you miss class, please check the web page for any changes announced in class that you might have missed.

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Date

Lecture Notes (If you prefer WORD files, change the *.html to *.doc)

Text Sections

Homework

Portfolio Questions

(subject to change … check often)

Unit 1: Enabling “Point-to-point links” via cell concepts and path loss models.

A

 

 

 

HW #0 Due

Jan 14!

Find and read the online syllabus.  Email me the answers that tell me about you and your expectations: david.x.landon@gmail.com.

1

Jan. 13

Introduction to Wireless Comms

 

Ch. 1.4, 2.1

Appendices B, F, H

Review dB

HW #1 Due Jan 20

 

 

1.2, 3.22, 3.23,

 

1A. What frequencies do cdma2000 and GSM use? How much bandwidth does each user have?  Does your cell phone use either standard?

 

1B. Answer the questions in Intro to passband communications based on running mybpsk3.m .  Don’t worry about understanding the entire script.  We’ll revisit it in HW #9 and #10.

2

Jan. 15

Cellular Systems

Ch. 3.1-3.5

 

HW #1

Solutions 1

Solutions 1b

 

 

3.4, 7 (v=22.22m/s), 14, 16

You may use the following with 0.2 inch grid:

http://www.incompetech.com/beta/hexGraphPaper/create.pl

 

1C. How do you compute the S/I ratio for a cellular system?

      **For N=12, n=2 and 4 

(a)sketch the frequency re-use pattern  (show which hexagons have frequency allocations 1-12).  (b) Determine how many co-channel cells are in the first tier (count them).  (c) Determine if a these choices achieve a S/I better than 15 dB—sufficient to support TDMA.

1D. How do you determine the number of subscribers that a cellular system can accommodate? 

1E. Define and explain Adjacent channel interference, and the Near-Far effect.

3

Jan. 20

 

Trunking, sectoring, splitting

 

Ch. 3.6-7

Appendix A

 

HW #2 Due Jan 27

 

2A. How do you compute the number of users, grade of service, etc. for a cellular system using the Erlang charts or equations?

2B. How do you compute the number of users in a system with sectored or split cells? Define and explain QOS. 

3.5, 10, 13, 15, 26         

4

Jan. 22

Propagation Modeling

 

Ch.4.1-4.4

 HW #2

SolutionsA

SolutionsB

SolutionsC

 

SolutionsD

2C. How do you compute the free-space power at a large distance from the transmitter?

 

2D. Create a spreadsheet to solve the following: typical cell phones transmit 1W maximum.  Receivers require -115 dBm of power.  What is the maximum distance between a cell phone and base station that could work in an ideal case with matching base and mobile antennas: (a) isotropic antennas (b) dipole antennas (c) patch antennas with a gain of 7 dB?   Use 915 MHz for your initial frequency.  How do the values change when you go to higher frequency?

 

4.1, 3, 4

5

Jan. 27

Two-ray model

Ch. 4.5-6

 

HW #3, Due Feb 3

solution 3a

solution 3b

solution 3c,e

solution 3d

3A. How do you calculate the receiver power for reflections (parallel and perpendicular polarization) at dielectric interfaces? 

3B. How do you calculate the received power for the two-ray model?

3C. Add columns to your spreadsheet in 2D to compute (note this change) the received power given d.  Please compute Pr for d = 2 km, 20 km, 50 km and 100 km, with ht = 40 m, and hr = 2 m and the other parameters from 2D.  Use the “exact” and approximate equations of the 2-ray model at f = 915 MHz and 1900 MHz.  How close are the two approaches for these distances and frequencies?  Which achieve -115 dBm of received power?  Click here for further explanation.  Also click here for a sample of what this might look like.

4.5, 6, 10, 12, 14

6

Jan. 29

Refining propagation calculations 

Ch. 4.7-10

 

HW #3

3D. How do you compute the diffraction in a cellular system?  (consider equations as well as graphs)

3E. Add columns to your spreadsheet in 2D, 3C to compute Hata model path losses.  Please also change 3E to compute Pr via the Hata model, given the same values used in 3C in a suburban environment.

4.19, 20, 23

7

Feb 3

Link Budgets, BER, log-normal margin, and cell radius

 

HW #4, Due Feb 10

4A. Explain when Friis, 2-ray, Hata models can and cannot be used.

4.22, 27, 28, 29

 

8

Feb 5

Review Unit I

 

 Midterm 2005 prob 2 solution part a,

                                                part b

 

See Review section of webpage for study guide and old exams.  Of the three midterm exams, this is the one that is most similar to past exams.

 

Feb 10

Midterm I

 Solutions: 1, 1b, 1c, 2, 3, 3b

 

 Open portfolio, closed book.

Unit 2: How fading hurts a link and how to lessen these penalties.

9

Feb 12

Small Scale Multipath

Ch. 5.1-2, 4-5

HW #5, Due Feb 17

5A. What is multipath? What is fading? What causes them?

5.1, 2, 16, 28, 30

10

Feb 17

 

Rayleigh & Ricean fading & channel measurements

Ch.5.3, 6 and 6.12 

Class “notes” a

Class “notes” b

Class “notes” c

data.mat

HW #6, Due Feb 24

5.4, 25, 26

6.36a – not b

Data for lab 

6A. Fading Lab

11

Feb 19

FEC coding gain & interleaving

Ch. 7.12 http://en.wikipedia.org/wiki/Hamming_7,4

 

Hamming code FEC notes

HW #6

 

Solutions

6B. Complete and execute this FEC matlab assignment and answer the questions it poses.

12 

Feb 24

Source coding and LPC vocoders

8.3-7, 11

View online—don’t print: MacKay book Chapter 4: intro, 4.1-4.3.

HW #7, Due Mar 3

Solutions

7A. Complete this mini-lab on vocoders and source coding.

13

Feb 26

Equalization

 

 7.1-3, 7.7.2, 7.8.4

HW #7

Solutions

7B. Complete and execute this Equalizer matlab assignment and answer the questions it poses.

5.6

7.4

14 

Mar 3

Direct Sequence Spread Spectrum 

PN Codes

CDMA Hardware/ System view

6.11

HW #8, Due Mar 12

 

8A. Complete and respond to questions in this PN codes lab assignment.

6.20, 21, 24

 

15

Mar 5

Diversity and Multiple Antenna Systems

7.10-11

 
 

 

 

 HW #8

7.7, 10, 11

 

 

 

 

Mar 10

Review Unit II

 Sample questions solutions p1, 2, 3, 4, 5, 6

 

 

 

Mar 12

Exam II

 

 

 Open portfolio, closed book.

 

Mar 16-20

Spring Break!

 

 

 

Unit 3:  Efficiently sharing spectrum for high capacity.

18

Mar 24

AM and FM modulation and hardware

RF Regulation 

Ch. 6.1-6.3

HW #9 Due Mar 31

9A. For AM and FM modulation, sketch the circuit diagrams for the transmitters and receivers.  Understand what every part is, why it is there, and how it works. Compare and Contrast AM and FM.

9B. Email david.x.landon@gmail.com with a 1st and 2nd choice of your semester project topic.  Use the following links to get an idea of what the projects are all about.

Overview of projects

Cover Sheet 

What do you need to reference? (everything that you use/modify/recognize from someone else, even if it is not a direct quote.  When in doubt, reference.)

How to reference – See Thesis Handbook

See References on Writing in Tutorial section of webpage. 

IEEE Reference Format  (see the section on references)

Suggestions: WAP,USDC/AMPS/ETACS, GSM, CDMA IS95, Bluetooth, ISDN, CDPD, SS7, etc. W-CDMA, MIMO, OFDM, OFDMA, GSM-Edge, UMTS, digital timing recovery circuits (early late, Gardner interpolator), LDPC, TPC, turbo-codes, waterfilling.

19

Mar 26

Digital Modulation and Pulse Shaping

Ch. 6.4-6.6 

 

HW #9

9B. Answer portfolio questions at the top of the digital mod and pulse shaping lecture notes.  Feel free to look at  mybpsk3.m, but the tasks disagree in several ways.

20

Mar 31

BPSK, DPSK, QPSK, 16-, 64-QAM, 12/4-APSK, 32-APSK, 128-QAM Cross-II

FSK, GMSK

Ch 6.7

 

HW #10, Due Apr 7

5.3

 6.11, 12, 30

10A. Complete this APSK assignment.

Insert your name and project title (after approval) into the schedule of presentations.

21

Apr 2

Multiple access schemes

 

Ch. 9.1-6

HW #10

10B. Complete this mini-lab on Bluetooth and its use of FHSS.

 

 9.1 , 5, 7

22

Apr 7

Multiple access capacity

CDMA link budget variables

Ch. 9.7

HW #11, Due Apr 14

 9.10, 12, 17

23

Apr 9

Shannon capacity

Ch. 7.13

HW #11

Complete this DVB-S2 mini-lab to compare various Shannon capacities.

6.13

In an email directly to david.x.landon@gmail.com, submit your abstracts for Wireless Symposium DUE:  Title, Name, Time/Date, topic description (about 250 words)

24 

Apr 14

MIMO

OFDM

LTE

 Wikipedia: LTE, MIMO, OFDM, OFDMA

HW #12, Due Apr 16

Complete this LTE mini-lab to consider the impact of MIMO in a 4G wireless standard.

Signup Sheet for Wireless Symposium in class.  Choose Apr 23 if you have real conflicts from 8am-2pm on Apr 28.

go to the US Patent and Trademark Office www.uspto.gov website and find the following patents. 6,097,771 and 6,317,466. Summarize the claims of the first patent in a paragraph. 

Outline the components of a patent using the second patent as a template.

25

Apr 16

Exam Review

 

 

 

 

Apr 21

Exam III

 

 

 Open portfolio, closed book.

 

Apr 23

Wireless Symposium

 

 

 

 

Apr 28 8-2pm

Wireless Symposium

 

 

·        Present your topic (15min)

·        Bring 3 hard copies of your paper for other students. 

·        Turn in 1 hard copy of your paper (with cover sheet) AND printouts of your slides 6/page to Dr. Landon.

·        Listen to / evaluate at least 8 other topics

·        Read/comment on at least 3 other topics

 

Apr 28

Semester review during class time

 

 

 

 

 Thurs,

May 7

1-3 pm 

Final Exam

 

 

·        Open portfolio, closed book.  Final will be broken into three parts.  Each part is optional and is your chance to erase a bad midterm.  It will consist of three sections comparable to each of the first three exams.  The first section can replace Exam I, second section Exam II, etc.  Each will be comparable to the midterms, so you may not be able to finish all three.  Simply mark which sections you’d like graded.