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Unformatted text preview: ECE231 1 HOMEWORK # 2 B09 Name : ECE Box Number: _ Due date: This assignment is due Wednesday, November 11, bring to Class. Make a photocopy
for your reference for fast comparison to solution set. Put all answers on the lines provided! Problem 1 — Signal energy
For the following functions, compute the signal energy (show the integration work) and provide the
answer in Joules (assumes usual 1 9 load interpretation of energy). (a) x(t) : t  u(t) — t . u(t — 2) (b) :1:(t) 2 6‘2‘ [u(t) — u(t —— 3)] + 2e‘3tu(t — 1) Problem 2 —— Signal power For the following functions, compute the signal energy and provide the answer in Watts (assumes
usual 1 (2 load interpretation of energy). (a) 3:05) is an everlasting periodic signal with period 2 seconds. The function which describes it over
one Whole period over the interval 0 S t < 2 is: w) = 56*t [u(t) — u(t — 2)] (b) $(t) : 4 (305(2025 + g) — 2008(7rt) Problem 3 —« Even/ Odd Signals The function 2:05) : e'tu(t + 2) is not even or odd. But every function can be expressed as a sum
of an even and an odd function, $(t) = xe(t) + x0(t). a) Find 569(15). b) Find $005). c) Sketch $80) and 9:0(t) on the same graph for —3 S t g 3. { I 4,” N ~ _ 1 L J x J L ' L t 4 J I J..._L L
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< 4 E l l (b) Write the function y(t) which results from differentiation of $05) by using Dirac impulse functions as needed to represent differentiation over a discontinuity. Problem 5 ~ Dirac Impulse function evaluations Evaluate the following integrals (a)
[00 2008(30t — 7r/3)  6(15 + 2)dt (b) 2 [00 €:€:—  [26(t— 1) ~26(t~2)]dt —OO Problem 6 »— Convolution by Table Solve the following convolution by using the table in the book on page 177. Note: the * is the
convolution operator and not multiplication in this and the following problem. y(t) = [3 te”2tu(t — 1) + t2e"3tu(t — 2)] >< 2e‘tu(t) Problem 7 —— Convolution by Integration Solve the following convolution by performing the actual integration. Be very careful to give the
complete form of the solution for y(t), that is, valid for any t. y(t) :2 [u(t — 1) — u(t — 2)] * 2 e"(t_1)u(t — 1) Problem 7 — Matlab graphing Read pages 5360 of the textbook if you have not yet done so (it was in the reading assignments).
Matlab is installed on ECE and school—wide (CCC) computers on campus. You should either ﬁnd
an icon for Matlab on the desktops of these computers or in a submenu of the Windows Start menu.
Launch Matlab as you would any program. Once Matlab has launched and initialized itself, you
will ﬁnd a >> prompt awaiting your commands. You can either use Matlab like a calculator, typing
and executing each command manually, or you can use its built in editor to create scripts that can
be saved and executed again at a future date. You should try entering all the commands in the
textbook section mentioned above if you are not yet familiar with Matlab to get some experience
with it. Also see the many tutorials that I have placed in the “resources” section of the course
website to get additional clues as to how to do basic tasks. (a) Do problem B22 in the textbook. Attach your plots to this homework (yes, with a staple)
(b) Do problem B23 in the textbook. Again attach your plot. ...
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 Winter '08
 HAKIM

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