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Course: ENEE 324, Fall 2009School: Maryland
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324 ASSIGNMENT ENEE 2 Due Thu 09/10 A student enrolled in a degree program takes a total of thirty-two courses, indexed by i = 1, . . . , 32 and also spread evenly over eight semesters. Each course is graded on an A through D scale, and the events Ai , Bi , Ci and Di denote that the student earned the respective grade when taking the ith course. (Each course is attempted once only.) (i) (3 pts.) Consider the...
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324
ASSIGNMENT ENEE 2
Due Thu 09/10
A student enrolled in a degree program takes a total of thirty-two courses, indexed by i = 1, . . . , 32 and also spread evenly over eight semesters. Each course is graded on an A through D scale, and the events Ai , Bi , Ci and Di denote that the student earned the respective grade when taking the ith course. (Each course is attempted once only.) (i) (3 pts.) Consider the four events A1 , B1 , A2 and B3 . Determine whether each possible pair has empty or nonempty intersection, and draw the four events on a Venn diagram. (ii) (3 pts.) Express the event = E two As and two B s are earned in the rst semester symbolically in terms of Ai s and Bi s. (iii) (3 pts.) Express the event F = no Ds are earned in the rst semester symbolically using Di s. (iv) (3 pts.) Express the event
32
G=
i=1
(Ci Di )
verbally as simply as possible. (v) (2 pts.) What is the relationship between G and
32
H=
i=1
(Ai Bi )
?
(vi) (3 pts.) If the students course record (transcript) is viewed as a random experiment with 432 = 264 possible outcomes, how many of these outcomes fall within the event F ? (vii) (3 pts.) Similarly, how many outcomes does H contain?
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Maryland - ENEE - 324
ENEE 324ASSIGNMENT 3Due Tue 09/15Problem 3.1 The outcome of a random experiment is a pair of integers (i, j ) in cfw_1, 92 . The probability mass function for the eighty-one outcomes is depicted below, where each symbol represents a dierent probability
Maryland - ENEE - 324
ENEE 324ASSIGNMENT 4Due Thu 09/17A circuit is fabricated by one of three facilities, labeled i = 1, 2, 3. The fraction of circuits on the market produced by Facility i is i . The table below shows the probabilities (likelihoods) that a circuit manufact
Maryland - ENEE - 324
ENEE 324ASSIGNMENT 5Due Tue 09/22Problem 5A In the diagram below, information ows from the transmitter T to receivers R1 and R2 via links controlled by switches 16. Switches operate independently of each other, and the probability that a given switch i
Maryland - ENEE - 324
ENEE 324ASSIGNMENT 6Due Thu 09/24In any given morning, Ill have a mun with probability 0.5, a bagel with probability 0.3 and nothing at all with probability 0.2. My choices vary independently from day to day. (i) (4 pts.) Compute the probability that I
Maryland - ENEE - 324
ENEE 324ASSIGNMENT 7Due Tue 09/29A point on the unit square [0, 1]2 is chosen at random according to a uniform probability assignment, i.e., the probability that it lies in a certain region (within the unit square) equals the area of that region. Let R
Maryland - ENEE - 324
ENEE 324ASSIGNMENT 8Due Tue 10/06The probability density function (pdf) of a continuous random variable X is given by cx , fX (x) =0x1 cx2 , x > 1 0, x<0(i) (2 pts.) Sketch fX (x). What is the range of values of X ? (ii) (2 pts.) What is the value
Maryland - ENEE - 324
ENEE 324ASSIGNMENT 9Due Thu 10/08The probability density function (pdf) of a continuous random variable X is given by fX (x) = cx2 ex/2 u(x) where u(x) is the unit step at x = 0 and c > 0. (i) (3 pts.) Determine the value of x which maximizes fX (x). S
Maryland - ENEE - 324
ENEE 324ASSIGNMENT 10Due Tue 10/13Problem 10A An appliance uses one of three circuits (i = 1, 2, 3). The lifetimes Xi (in thousands of hours) of the three circuits have Gaussian distributions: X1 N (6.0, (1.5)2 ), X2 N (6.5, 1.5)2 ) and X3 N (7.0, (1.5
Maryland - ENEE - 324
ENEE 324ASSIGNMENT 11Due Thu 10/15Consider the transformation (function) y = g (x) = (i) (2 pts.) Sketch y = g (x). (ii) (6 pts.) In each of the following cases, determine the range SY (of values) of the output random variable Y = g (X ) based on the r
Maryland - ENEE - 324
ENEE 324 Problem 12AASSIGNMENT 12Due Tue 10/20Consider the transformation (function) g (x) = 0, x<0 x, x 0(i) (2 pts.) If X is a continuous random variable with range SX = R, what is the range SY of Y = g (X )? Is the distribution of Y continuous, dis
Maryland - ENEE - 324
ENEE 324ASSIGNMENT 13Due Thu 10/22Let X be an exponential random variable with = 4. (i) (2 pts.) Give a formula for E [X n ], where n is a positive integer. (ii) (4 pts.) Determine E [(X 2)4 ]. (iii) (5 pts.) Determine E [Y ], where Y = maxcfw_e2X , e2
Maryland - ENEE - 324
ENEE 324 Problem 14AASSIGNMENT 14Due Tue 10/27X and Y are random nonnegative integers such that P [X = i, Y = j ] = c 2ij , 0 i j ; 0, otherwise.(i) (4 pts.) Determine, in terms of c, P [X = i] and P [Y = j ] for every i 0 and j 0. (ii) (4 pts.) What
Maryland - ENEE - 324
ENEE 324 Problem 15AASSIGNMENT 15Due Tue 11/03X and Y are independent and identically distributed random variables with pdf fX (t) = fY (t) = 1/(t + 1)2 , t 0; 0, t < 0.(i) (2 pts.) Sketch the region on the (x, y ) plane where the random pair (X, Y )
Maryland - ENEE - 324
ENEE 324ASSIGNMENT 16Due Thu 11/05Consider the curve in the rst quadrant of the (x, y ) plane dened by y= 2 x, 0 x 1; 1/x2 , x > 1.(i) (2 pts.) Sketch the region A in the rst quadrant bounded by the two positive axes (x and y ) and the curve dened abo
Maryland - ENEE - 324
ENEE 324 Problem 17A The density of X is given byASSIGNMENT 17Due Tue 11/10fX (x) =2x, 0 < x < 1; 0, otherwise.The conditional density of Y given X = x is given by fY |X (y | X = x) = cx2 /y 3 , y x; 0, otherwise.(i) (2 pts.) Shade the region on the
Maryland - ENEE - 324
ENEE 324ASSIGNMENT 18Due Thu 11/12Let X1 , X2 , . . . be pairwise uncorrelated random variables with mean and variance 2 , i.e., Cov(Xi , Xj ) = 2, i = j ; 0, i = j .The sequence cfw_Xn , n 1 is the input to a time-varying causal lter which produces a
Maryland - ENEE - 324
ENEE 324ASSIGNMENT 19Due Tue 11/17Let . . . , U0 , U1 , U2 , . . . be pairwise uncorrelated random variables with mean = 3 and variance 2 = 36. For every n, dene Un1 Un2 Xn = Un + 2 3 (i) (4 pts.) Determine Cov(Xn , Xn+k ) for every k Z. (ii) (3 pts.)
Maryland - ENEE - 324
ENEE 324ASSIGNMENT 20Due Tue 11/24Let X1 , X2 , X3 , . . . be independent positive random variables with pdf as shown below, where 0 < b < a.f (x )X?0a- baa+bxThe sequence is recorded using an instrument with dynamic range [0, 5]. Thus the rec
Maryland - ENEE - 324
ENEE 324ASSIGNMENT 21Due Thu 12/03Problem 21A Consider a service model where each day (e.g., between 9 AM and 5 PM), a server processes no more than two jobs. The servers buer can hold up to two jobs. Jobs arrive during the night (e.g., between 12 AM a
Maryland - ENEE - 324
ENEE 324 Problem 22AASSIGNMENT 22Due Thu 12/10Consider a Poisson arrival process cfw_N (t), t > 0 (where t is in seconds) of rate = 2 arrivals/sec. (i) (2 pts.) Determine P [N (4) = 8]. (ii) (3 pts.) Determine P [N (5) = 10 | N (1) = 2]. (iii) (3 pts.)
Maryland - ENEE - 241
ENEE 241 02HOMEWORK ASSIGNMENT 1Due Fri 01/08Consider the complex numbers z1 = 1 + j 3 and z2 = 1 j(i) (3 pts.) Plot both numbers on the complex plane. (ii) (3 pts.) Evaluate |zi | and zi for both values of i (i = 1, 2).2 2 3 (iii) (6 pts.) Evaluate
Maryland - ENEE - 241
ENEE 241 02*HOMEWORK ASSIGNMENT 2Due Mon 02/04Consider the complex numbers u = ej (/7) , v = ej (6/7) , and w = ej (2/5) (i) (2 pts.) Plot the three numbers on the complex plane. (ii) (3 pts.) Plot the straight line described by the equation |z u| = |z
Maryland - ENEE - 241
ENEE 241 02*HOMEWORK ASSIGNMENT 3Due Wed 02/06Use your calculator for algebraic and trigonometric functions only, as indicated. Trial-and-error or graphical solutions to parts (i)(iii) are not acceptable. Consider the sinusoid x(t) = A cos(t + ), where
Maryland - ENEE - 241
ENEE 241 02*HOMEWORK ASSIGNMENT 4Due Fri 02/08Consider the discrete-time sinusoids x[n] = cos 3n 2 + 4 3 and y [n] = cos n 2 + 5 3(i) (4 pts.) What is the period N of x[]? Use MATLAB to generate a discrete plot of the rst four periods of x[], (i.e., f
Maryland - ENEE - 241
ENEE 241 02*HOMEWORK ASSIGNMENT 54 3 2 1 0 1 2 3 4Due Mon 02/1100.10.20.30.40.50.60.7 The rst period of the sinusoid x(t) = A cos(t + ) is plotted above, where x(0) = 2 3. (i) (5 pts.) Determine A, and . In what follows: A and are as found in
Maryland - ENEE - 241
ENEE 241 02*HOMEWORK ASSIGNMENT 6Due Wed 02/13(i) (5 pts.) Compute the sum of the two discrete-time sinusoids: x1 [n] = cos(2n/5 + /3) and x2 [n] = cos(8n/5 + /4)(Hint : Start with reducing the angular frequency of x2 [n] to a value between 0 and , th
Maryland - ENEE - 241
ENEE 241 02*HOMEWORK ASSIGNMENT 7Due Fri 02/15(i) (2 + 2 pts.) Suppose a 3 3 matrix A satises 1 4 0 3 A 0 = 2 , A 1 = 2 0 1 0 2 Find A and compute 1 A 0 1 010 B= 0 0 1 100 and 0 0 A 0 = 1 . 1 2(ii) (10 pts.) Ifand x = [ 1 2 3 ]T , determine the fol
Maryland - ENEE - 241
ENEE 241 02*HOMEWORK ASSIGNMENT 8Due Mon 02/18(i) (10 pts.) It is known that 1 4 A 1 = 5 , 0 6 Determine the matrix A. 2 1 A 1 = 4 0 0and 2 7 A 1 = 6 2 2(ii) (10 pts.) Without using your calculator, determine so that the product of the ve matrices
Maryland - ENEE - 241
ENEE 241 02* Consider the matrixHOMEWORK ASSIGNMENT 9 abcd A= e f g h wxyz Due Wed 02/20In each of the following cases, nd matrices P and Q such that PAQ equals the matrix shown. (Note that if either P or Q is superuous, it trivially equals I.) wxyz e
Maryland - ENEE - 241
ENEE 241 02*HOMEWORK ASSIGNMENT 10Due Fri 02/22Solve by hand without using calculator matrix functions. Show all intermediate steps. Let 1 0 U= 0 0 2 1 0 1 2 1 0 1 2 0 0 1(i) (4 pts.) Solve Ux = b for arbitrary x and b. Display U1 . (ii) (6 pts.) Show
Maryland - ENEE - 241
ENEE 241 02*HOMEWORK ASSIGNMENT 11Due Wed 02/27Solve by hand without using calculator matrix functions. Show all intermediate steps. Consider the 4 4 system Ax = b, 2 1 4 0 A= 1 3 2 6 9 (i) (14 pts.) Determine x. (ii) (6 pts.) Express A in the form LU,
Maryland - ENEE - 241
ENEE 241 02HOMEWORK ASSIGNMENT 12Due Fri 02/29Solve by hand without using calculator matrix functions. Show all intermediate steps. Let 1 2 A= 1 1 4 2 1 3 4 0 3 1 4 2 3 2(i) (8 pts.) Obtain the LU factorization A = LU. (ii) (12 pts.) Determine A1 by s
Maryland - ENEE - 241
ENEE 241 02*HOMEWORK ASSIGNMENT 13Due Mon 03/03Solve by hand without using calculator matrix functions. Show all intermediate steps. Consider the following 1 1 1 1 A= 1 2 1 3 three matrices: 1 1 1 1 B= 4 8 6 91 2 3 5 234 4 7 8 5 9 12 7 12 201 2 1 2
Maryland - ENEE - 241
ENEE 241 02*HOMEWORK ASSIGNMENT 14Due Wed 03/05Solve by hand without using calculator matrix functions. Show all intermediate steps. Consider the three-dimensional vectors v(1) = [ 1 2 2 4 ]T and v(2) = [ 4 2 2 1 ]T . (i) (4 pts.) Compute v(1) and v(2)
Maryland - ENEE - 241
ENEE 241 02HOMEWORK PROBLEM 15Due Fri 03/07Solve by hand without using calculator matrix functions. Show all intermediate steps. Let v(1) = [ 5 3 1 1 ]T , v(2) = [ 5 1 7 3 ]T and v(3) = [ 1 1 10 0 ]T . Also, let s = [ 3 1 4 4 ]T . (i) (5 pts.) Determin
Maryland - ENEE - 241
ENEE 241 02HOMEWORK ASSIGNMENT 16Due Mon 03/10This problem investigates the least-squares approximation of the function s(t) = 1 (t 1)2 1 + 4(t 1)2over a discrete interval of values t using a sum of three sinusoidal functions: f1 (t) = sin(t/2) , f2 (
Maryland - ENEE - 241
ENEE 241 02*HOMEWORK ASSIGNMENT 17Due Wed 03/12This problem refers to the range estimation example in the textbook (p. 113). Suppose f1 = 3 MHz, f2 = 2.5 MHz and = 1.45. The vector s in the le dataB17.txt contains 101 samples of the noisy waveform s(t)
Maryland - ENEE - 241
ENEE 241 02 Consider the 4 3 matrix V =HOMEWORK PROBLEM 18 v(1) v(2) v(3) given byDue Fri 03/14 1.3702 4.6799 0.6379 1.8877 2.5466 4.7986 V= 2.0596 5.5447 2.1429 2.5134 3.7242 0.9872 (i) (3 pts.) Compute (e.g., in MATLAB) the inner product matrix VT V,
Maryland - ENEE - 241
ENEE 241 02HOMEWORK PROBLEM 19 v(1) v(2) v(3) given byDue Mon 03/24Consider the complex-valued matrix V = 3 a + jb 6j 3 a + jb V = 6j a + jb 6j 3 (i) (4 pts.) Determine the only pair of real values a and b such that the columns of V are orthogonal. F
Maryland - ENEE - 241
ENEE 241 02*HOMEWORK ASSIGNMENT 20Due Wed 03/26Exam 2 (Monday 03/31) will cover Assignments 10-20. Let V= v(0) v(1) v(2) v(3) v(4) v(5) be the matrix of Fourier sinusoids of length N = 6. (This is the same matrix as in the last example of Reading Assig
Maryland - ENEE - 241
ENEE 241 02*HOMEWORK ASSIGNMENT 21Due Fri 03/28Solve without using MATLAB, except to verify your results. All vectors have length N = 10. (i) (4 pts.) The time-domain vector x(1) has DFT X(1) = 0 1 0 0 0 0 0 0 0 1TWhich two Fourier frequencies does x
Maryland - ENEE - 241
ENEE 241 02HOMEWORK ASSIGNMENT 22Due Wed 04/02The real-valued signal vector s has DFT S= 6 z1 3 + 2j 7 z2 5 + 3jT(i) (2 pts.) What are the values of z1 and z2 ? (ii) (3 pts.) Without using complex algebra (or MATLAB), determine the sum of the entries
Maryland - ENEE - 241
ENEE 241 02 The signal vector s is given byHOMEWORK PROBLEM 24Due Mon 04/07s=abcdefghT(i) (8 pts.) Display the following vectors: s(1) = P2 Rs s(2) = R2 Ps s(3) = P4 s s(4) = F2 s (ii) (12 pts.) Express the following vectors in terms of P, R, F and
Maryland - ENEE - 241
ENEE 241 02*HOMEWORK ASSIGNMENT 26Due Fri 04/11Single-step the MATLAB script below, keeping a gure window open. Answer questions (i)-(viii). Print and submit the last two graphs, i.e., bar(n, real(X4) and bar(n, real(X5), only. (Make sure that your MAT
Maryland - ENEE - 241
ENEE 241 02*HOMEWORK ASSIGNMENT 27 y ofTDue Mon 04/14(i) (7 pts.) Determine the circular convolution s = x x= and y= (ii) (7 pts.) If 3 1 1 5 20 1 2TUsing the FFT function in MATLAB, verify that the DFTs X, Y and S satisfy X Y = S. 1 3 2 1 4 x0 x1
Maryland - ENEE - 241
ENEE 241 02 The signalHOMEWORK ASSIGNMENT 28TDue Wed 04/16x= has DFT X given by X=000abc000X0 X1 X2 X3 X4 X5 X6 X7 X8TExpress the following DFTs in terms of the entries of X: (i) (5 pts.) The DFT X(1) of x(1) = (ii) (5 pts.) The DFT X(2) of x(2) =
Maryland - ENEE - 241
ENEE 241 02HOMEWORK PROBLEM 29Due Fri 04/18Generate the 20-point signal vector x using the MATLAB script below. n = (0:19). ; f0 = 0.15 + 0.25*rand(1) ; A = 10*rand(1) ; phi = pi*rand(1) ; x = A*cos(2*pi*f0*n + phi) + 0.3*A*randn(size(n) ; Following th
Maryland - ENEE - 241
ENEE 241 02*HOMEWORK ASSIGNMENT 30Due Mon 04/28Each of the innite sequences x = x[ ], y = y [ ] and u = u[ ] (shown below) contains seven nonzero terms.4 3 2 1 1 x 2 1 4 3 y 2 4 3 un=0n=0n=0(i) (3 pts.) Express u[ ] as a linear combination of seve
Maryland - ENEE - 241
ENEE 241HOMEWORK ASSIGNMENT 32Due Wed 04/30Consider the FIR lter given by the input-output relationship y [n] = x[n] x[n 2] + x[n 4] x[n 6] , (Note the missing, i.e., zero-valued, coecients.) (i) (4 pts.) Show that the input sequences dened for all n b
Maryland - ENEE - 241
ENEE 241 02*HOMEWORK ASSIGNMENT 33Due Fri 05/02Consider the FIR lter whose input-output relationship is given by 1 3 3 y [n] = x[n] x[n 1] + x[n 3] x[n 4] , 2 4 8 nZ(i) Determine the response y (i) [ ] of the lter to each of the input signals given by
Maryland - ENEE - 241
ENEE 241 02HOMEWORK ASSIGNMENT 34 4 1 0 1 4TDue Mon 05/05 .Consider the FIR lter with coecient vector b =The following MATLAB script computes a segment of the lter output sequence y (1) [ ] for an input sequence x(1) [ ] which has period L = 5. Speci
Maryland - ENEE - 241
ENEE 241 02HOMEWORK ASSIGNMENT 35Due Wed 05/07Use the MATLAB script below to generate the coecient vector b of a bandpass FIR lter of order M = 44. f1 = 0.19 + .03*rand(1) ; f2 = 0.34 + .03*rand(1) ; F = [0 f1 f1+0.03 f2 f2+0.03 0.5]*2 ; G = [1 1 0 0 1
Maryland - ENEE - 241
ENEE 241 02HOMEWORK ASSIGNMENT 36Due Fri 05/09(Part A) (5 pts.) Consider the FIR lter with impulse response given by h1 [n] = [n] [n 1]. Compute the outputs y1 [n] and y2 [n] of this system when the inputs are (A.1) (2 pts.) x1 [n] = cos(n + ), and (A.
Maryland - ENEE - 241
ENEE 241 02HOMEWORK ASSIGNMENT 37Due Mon 05/12A FIR lter acts on the input sequence given by x[0 : 5] = 1 3 5 2 6 2T;x[n] = 0 for n < 0 and n > 5to produce the output sequence given by y [0 : 11] = 2 3 0 10 23 27 61 51 54 14 2Tand y [n] = 0 for n
Maryland - ENEE - 241
HW 1 SOLUTION_(i) Plot (-1,sqrt(3) and (1,-1) on the (x,y) plane.(ii) |z1| = sqrt(-1)^2+(sqrt(3)^2) = sqrt(1+3) = 2angle(z1) = arctan(-sqrt(3) + pi = 2*pi/3 = 2.0944|z2| = sqrt(1+1) = sqrt(2) = 2.828angle(z2) = arctan(-1/1) = -pi/4(iii) z1^3 =
Maryland - ENEE - 241
HW 2 SOLUTION_(i) The polar coordinates are |u| = 1, angle(u) = pi/7 |v| = 1, angle(v) = 6*pi/7 |w| = 1, angle(u) = 2*pi/5(ii) |z-u| = |z-v| is tha perpendicular bisector of the segmentjoining u and v. This straight line is the y-axis (x = 0) (ii
Maryland - ENEE - 241
HW 3 Solution_(i) We know that the value 2.5 occurs at t=0, 0.160 and 0.180 sec andat no other intermediate times. Since a sinusoid crosses any givenlevel (except its maximum and minimum) twice in each period, it followsthat the period T equals exact
Maryland - ENEE - 241
HW 4 Solution_(i) For x[.], we have w=3*pi/4 = (3/8)*(2*pi). Thusthe fundamental period of x[.] equals N = 8.N = 8;n = 0 : 4*N-1;x = cos(3*pi*n/4 + 2*pi/3);stem(n,x)(ii) The values of w such that cos(w*n) is periodic with fundamental period N
Maryland - ENEE - 241
HW 5 Solution_(i) Clearly, A = 4. The period T equals 0.7 sec, therefore f = 10/7 Hz andW = 20*pi/7cos(phi) = 2*sqrt(3)/A = sqrt(3)/2, therefore phi = pi/6 or -pi/6. By inspection, t=0 corresponds to a point in the last quarter-cycle of the cosine wa
Maryland - ENEE - 241
Maryland - ENEE - 241
HW 7 Solution _ (i) A = [-4 3 0 2 -2 -1 1 2 2 ] A*[1 ; 0 ; 1] = [-4 ; 1 3] (ii) (a) B*x = [2; 3; 1]. B is a transformation matrix that circularly shifts the elements of the vector x. (b) B^2*x = [3; 1; 2]. Multiplying by B circularly shifts t