ECE 437: Wireless Communications
Professor Daniela Tuninetti
(based on slides from Prof. A. Goldsmith)
ECE437 Summary
!
Wireless channels are a difficult and capacitylimited broadcast communications medium
!
Traffic patterns, user locations, and network
c
ECE 437 Wireless Communications
Daniela Tuninetti
UIC Fall Semester 2014
September 26 2014
Chapter 5 and Sections 6.1 and 6.2Revision of ECE 432s key ideas
The symbol (?) indicates a figure from http:/cnx.org/content/col10968/latest/.
1
General Communicat
ECE 437 Wireless Communications
Daniela Tuninetti
UIC Fall Semester 2014
October 2014
Chapter 7
1
Revision of SISO (Single Input Single Output) channels
Figure 1: SISO channel.
In Chapter 6 we saw that the performance of a digital modulation scheme on the
ECE437 Ch 6
!
Revision of Performance in AWGN
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Linear Modulations: Performance with
narrowband Fading
! Outage
Probability
! Average Ps (or average Pb)
!
Linear Modulations: Performance with
wideband Fading:
! Effect
! Effect
of Doppler Spread
of Delay S
ECE 437 Wireless Communications
Daniela Tuninetti
UIC Fall Semester 2014
October 13 2014
Chapter 6
1
Summary: probability of symbol error in Gaussian noise only
We can approximate
Pe M Q
p
2 M s ,
(1)
where the numbers (M , M ) depend only on the constell
ECE 437 Wireless Communications
Daniela Tuninetti
UIC Fall Semester 2015
August 26 2014
Chapter 3
1
Introduction
Wireless channels suffer from severe fluctuations in the received power, which is modeled as a combination of
three phenomena:
1. path-loss: d
ECE 437 Wireless Communications
Daniela Tuninetti
UIC Fall Semester 2014
August 26 2014
Chapter 2
1
PATHLOSS
Essence of signal propagation in simplified path-loss model
d0
Pr (d)
for d d0 for far-field approximation to be valid
=K
(d) :=
Pt
d
!2
G
c
K
21. Plot the average probability of error as a function of branch SNR for an M-branch
MRC system with 16QAM modulation for M = 1, 2, 4, 8. Assume each branch has
Rayleigh fading with the same average SNR. Your plots should have an SNR that
ranges from 5 t
ECE 437 Wireless Communications
Daniela Tuninetti
UIC Fall Semester 2015
October 6, 2015
Midterm Practice
1
Simplified Pathloss Model
1. Consider the set of empirical measurements of Pr /Pt in dB for dierent distances given in Table 1.
Table 1: Path-loss
ECE 437 Wireless Communications
Daniela Tuninetti
UIC Fall Semester 2015
October 19, 2015
Midterm
You have 50 minutes to complete this exam.
There are 70 points for this exam. Points for the individual problems are marked in the problem
statement.
If s
ECE 437 Wireless Communications
Daniela Tuninetti
UIC Fall Semester 2015
October 6, 2015
Midterm Practice
1
Simplified Pathloss Model
1. Consider the set of empirical measurements of Pr /Pt in dB for different distances given in Table 1.
Table 1: Path-los
ECE437 Ch 7
!
Array gain and diversity gain
!
Rx diversity: SC, TC, MRC, EGC
!
Tx diversity: beamforming, Alamuti scheme
!
Analysis via moment generating function
technique
BPSK + Nakagami-m fading
Diversity
!
Basic idea: send same bits/symbol over
MANY i
ECE 437 Wireless Communications
Daniela Tuninetti
UIC Fall Semester 2014
October 22, 2014
Midterm
You have 50 minutes to complete this exam.
There are 30 points for this exam. Points for the individual problems are marked below.
If something is not cle
ECE 437 Wireless Communications
Daniela Tuninetti
UIC Fall Semester 2013
October 23, 2013
Midterm
You have 50 minutes to complete this exam.
There are 100 points for this exam. Points for the individual problems are marked in the problem
statement.
If
ECE 437 Wireless Communications UIC Fall Semester 2012
Daniela Tuninetti December 10, 2012
Final
0 You have 120 minutes to complete this exam.
0 There are 20 questions in this exam organized in 7 problems, each question is worth 5 points.
0 If somethi
ECE 437 Wireless Communications
Daniela Tuninetti
UIC Fall Semester 20143
December 8, 2014
Final
You have 120 minutes to complete this exam.
There are 100 points for this exam. Each subquestion is 10 points.
If something is not clear, ask for clarifica
ECE 437 Wireless Communications
Daniela Tuninetti
UIC Fall Semester 2013
December 1, 2013
Final
You have 120 minutes to complete this exam.
There are 120 points for this exam. Each subquestion is 10 points.
If something is not clear, ask for clarificat
ECE 437 Wireless Communications
Daniela Tuninetti
UIC Fall Semester 2012
November 21, 2012
Midterm 2
You have 50 minutes to complete this exam.
There are 100 points for this exam. Points for the individual problems are marked in the problem
statement.
ECE 437 Wireless Communications
Daniela Tuninetti
UIC Fall Semester 2012
October 10 2012
Midterm 1
You have 50 minutes to complete this exam.
There are 100 points for this exam. Points for the individual problems are marked in the problem
statement.
If
ECE 437: Wireless Communications
Professor Daniela Tuninetti
(based on slides from Prof. A. Goldsmith)
ECE437 Ch 11 and 12
!
!
Wideband / frequency selective fading channels
ISI counter measures:
!
!
!
!
!
2nd Nyquist criteria for absence of ISI (see also
ECE 437 Wireless Communications
Daniela Tuninetti
UIC Fall Semester 2014
November 2014
Chapter 10
1
Static/non-fading MIMO channel
We saw that MISO and SIMO channels can be provide diversity gain, i.e., the probability of error decays
faster to zero as th
PRACTICE MIDTERM EXAM 2 SOLUTION
Jing Liang 10/25/2006
PROBLEM 1
(a)
For ML receiver output:
T
rk = r ( ) k ( ) d ;
0
For matched filter receiver output:
rk = r ( )k (T (T ) ) d = r ( ) k ( ) d
T
T
0
0
which is the same as that expression of ML receiver.
PRACTICE MIDTERM EXAM SOLUTION
Jing Liang 09/25/2006
PROBLEM 1
(a) Definition in Textbook p. 27
The signal variations due to multipath signal components. These variations occur over
very short distances, on the order of the signal wavelength, and so are s