EE 230B Homework 3 Solution: Synchronization
Prof. G. Pottie, UCLA EE Department
1. Show that the earlylate gate synchronizer illustrated in the lecture notes is a close
approximation to the timing recovery system illustrated below, where sgn(.) is the s
EE 230B Homework 4: Equalization II
Prof. G. Pottie, UCLA EE Department
1. (Quiz 3 08, slightly modified)
For the channel
a)
:
. Why is this channel problematic? What is the mse for an
ideal zero forcing linear equalizer?
b) Compute Jmin for the ideal MMS
EE 230B Homework 4: Equalization II
Prof. G. Pottie, UCLA EE Department
1. (Quiz 3 08, slightly modified)
1
1 1
+
z :
For the channel f (z) =
2
2
a) Show X(e jT ) = 1+ cos T . Why is this channel problematic? What is the mse for an
ideal zero forcing line
EE 230B Homework 2 Solution: Noncoherent Modulations; Phase Errors
Prof. G. Pottie, UCLA EE Department
1. (Midterm, 2000, modified) A wireless system uses either noncoherent FSK or binary
amplitude shift keying (ASK). For FSK,
t
2E
2E t
s(t) =
cos cos(
EE 230B Homework 2 Solution: Noncoherent Modulations; Phase Errors
Prof. G. Pottie, UCLA EE Department
1. (Midterm, 2000, modified) A wireless system uses either noncoherent FSK or binary
amplitude shift keying (ASK). For FSK,
For ASK,
a) Compute the psds
EE 230B Homework 4: Equalization II
Prof. G. Pottie, UCLA EE Department
1. (Quiz 3 08, slightly modified)
1
1 1
+
z :
For the channel f (z) =
2
2
a) Show X(e jT ) = 1+ cos T . Why is this channel problematic? What is the mse for an
ideal zero forcing line
A DC permanent magnet motor has an Ra=2 and a Jm = 0.03kgm2. The motor runs at 2000rpm and
draws 2.0A from a 120V DC source under noload conditions.
a) What is the voltage constant, Kv (V/rad/sec), for this motor?
E
E A kV ; kV A ; E A VT I A R A (motor
Name:
Date: 03/'10/10
ECE 31002: lntroduction to Power Engineering
CIRCLE ONLY ONE OF THE AVAILABLE OPTIONS IN ANY QUESTION,
DO NOT JUSTIFY YOUR ANSWERS UNLESS OTHERWISE REQUESTED.
Quiz No 4 (20 points)
1)
ln order to change the speed of the rotating mag
1
1) A 10kVA, 60Hz,480/120 Vrms, transformer has the following approximate equivalent parameters
referred to the primary Xm=2000,Rc=4000, Req=0.6,Xeq=1.2. A load ZL=230 is connected to
the Vsecondary=1200V with Vprimary=4800V Using the approximate equival
Name:
Date:03/03/10
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develops the rated torque as the rated voltage when the slip is 0.05 (a
Date: 4/28/2010
Name: DrF
ECE 31002: Homework 4
Problem 1 (6 pts)
The transformer on the left side of the following diagram functions as a stepdown with a turns
ratio of 12:1, while the transformer on the right functions as a stepup with a turns ratio
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Date:
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Quiz No 1 (20 points)
WILL NOT RECEIVE
ANY CREDIT FOR THAT QUESTION. DO NOT JUSTIFY YOUR ANSWERS.
DO NOT WRITE ANYTHING ON THE SIDES OF THIS
Quiz 3
1 Page
The frequency is reduced to 30Hz and the voltage is reduced to maintain the same magnitude of
current through Xm as Part I. The load is adjusted to get the same slip as part I. All the reactance
in the equivalent circuit should be cut in par
Name: DrF
DaIe:212612410
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Homework4
Problem 1 (10 pts)
Using the diagram of the Hbridge converter answer the following:
a)
b)
c)
d)
lf diode De* is "ON", which other semiconductor will be "ON'?
lf Tn* and Ts dre "ON", the diod
EE 230B Homework 2: Noncoherent Modulations; Phase Errors
Prof. G. Pottie, UCLA EE Department
1. (Midterm, 2000, modified) A wireless system uses either noncoherent FSK or binary
amplitude shift keying (ASK). For FSK,
t
2E
2E t
s(t) =
cos cos(2f c t )
EE 230B Homework 5 Solution: Transceiver Implementation
Prof. G. Pottie, UCLA EE Department
1. Noise Figure
It is desired to provide a gain of 30 dB from an amplifier cascade. We have access to
amplifiers of two types, with (G,F) of (10,4) and (100,10). M
EE 230B Homework 3: Synchronization, ZF Equalization
Prof. G. Pottie, UCLA EE Department
1. Show that the earlylate gate synchronizer illustrated in the lecture notes is a close
approximation to the timing recovery system illustrated below, where sgn(.)
1
l ) A lOkVA. 60l 7~480ll20 Vm. transformer has the following approximate equivalent parameters
referred to the primary Xm=20000,Rc=40000. R¢q=(l,6ﬂ,Xw=l .29. A loud ZV=2 I. 30"!) is connected to
the Vsmndln‘=l20l_ 0°V with V,i.,=480t_ 0“V Using the a
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Lecture 17: Multiple Access
(Ch. 14)
EE230B Prof. Greg Pottie
1
Outline
Traffic models and QoS
TDMA, FDMA, CDMA for single cells
Random access vs. reservation protocols
EE230B Prof. Greg Pottie
2
Quality of Service
For digital links, typically interest
EE 230B Midterm, Spring 2015
UCLA Electrical Engineering Department
NAME_
Prof. G. Pottie
Instructions:
This is a closed book exam; you have two hours to complete it.
Calculators may be used.
Attempt all three questions; they are of equal weight but not
n
EE 230B Homework 7 Solution
Prof. G. Pottie
1. Antenna Array Gain
Since for the undesired ray
r2 Ae
j ct
e
j sin
, the factor we need to work with is
. Thus, following the example in class, we solve
ej 1
1 1 G1 1
1 1G2 0
Both weights are thus bef
EE 230B OFDM vs. DFE Comparison Practice Problem Solution
Consider a channel with noise psd N0=0.001, channel response C(f) and choice of shaping
filters S1(f) or S2(f) as indicated below. These two shaping filter characteristics are
approximations of squ
EE 230B Quiz 1, Spring 2012
UCLA Electrical Engineering Department
Prof. G. Pottie
NAME:_
Instructions: This is a closed book examination. Calculators may be used. A sheet of
formulae, some of which may be relevant, is attached. You have 40 minutes.
a) Co
EE 230B Homework 8 Problem 5.
Limit for N large
To upper bound the capacity, consider the situation of full occupancy of every channel. Then for
problem 2, with power controlled for equal received levels,
1 " 2 * 81
2
2
2 * 81 %
I= $
+
+
+
= 1/14.7
4 # 62
l. IQ Mismatched QAM
For a signal point (a,b) subject to IQ mismatch, the innphase and quadrature components
become
I! =a(l+t(%)(1+2)si(%)
xa=a(I%)sin(%)+b(1)ws()
a) Consider a square QAM constellation in which the outer corner points have
coordinate
EE 230B Final Examination, Spring 2016
UCLA Electrical Engineering Department
Prof. G. Pottie
Instructions:
This is a closed book exam; you have 3 hours to complete it.
Calculators may be used.
Attempt all five questions; they are of equal weight but not