EE 230B Final Examination, Spring 2008 UCLA Electrical Engineering Department Prof. G. Pottie
NAME:_
Instructions: Attempt all five questions; they are of equal weight but not necessarily of equal dif
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hapler Two: Probability and Stochastic Processes 77
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no The random variable 1’ is deﬁned as
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EE 231E Channel Coding Instructor: Rick Wesel 116 pts, 180 minutes
Spring 2008 Final Thursday, June 12, 2008 11:30 a.m. - 2:30 p.m.
Your Name: Your ID Number:
Problem 1 2 3 4 5 6 7 Total
Score
Possibl
Discussion 1 - YSR
1. A/D and D/A conversion
Any band-limited random process can be completely represented by its samples (A/D) and the original process can be completely reconstructed (D/A) with the
EE 230B Final Examination, Winter 2008 UCLA Electrical Engineering Department Prof. G. Pottie
NAME:_
Instructions: Attempt all five questions; they are of equal weight but not necessarily of equal dif
CS 118 Computer Network Fundamentals Purpose and content of the course: In this course we study the way a Computer Communications Network such as the Internet works. Namely, we investigate the buildin
EE 231E Channel Coding Instructor: Rick Wesel 82+10 pts, 110 minutes
Spring 08 Midterm Tuesday, May 6, 2008
SOLUTIONS:
1. (10 pts) Proof of Singleton. State and prove the Singleton Bound: Solution: Th
(e) (4 pts) Compute an upper bound on the probability of error Pe for this code on the binary symmetric channel with probability of error p = 104 . You may assume that 1 104 1 dT (W, I ) dI
Pe =
I =1,
Simulating Digital Communication Systems
Digital communication systems are always simulated via a discrete, baseband equivalent model of the passband continuous time system. That is, we consider a sys
CS 118 Winter 05 Midterm Prepared by: M Gerla and Johnny Tsao Revised by: M Gerla and Daeki Cho
1. TCP properties 15 pts Which properties does TCP share with Go-Back-N, and which does it share with Se
EE 230B Quiz 3 Solution Spring 2009 UCLA Electrical Engineering Department Prof. G. Pottie Consider the following channel: z-1 2-1/2 X 2-1/2 X To this is added AWGN with variance N0= 0.01. a) Determin
EE 230B Quiz 3, Spring 2008 Solutions Prof. G. Pottie 1 1 1 + z: For the channel f ( z) = 2 2 z-1 1/ 2 X 1/ 2 1/ 2
X
a) Show X (e jT ) = 1 + cos T . Why is this channel problematic? Solution: Since t
Quiz 2 Solution Spring 09
EE230B Prof. Greg Pottie
1
a) Error Probability for BPSK
For binary PSK, s (t ) = E1 (t ), s2 (t ) = E1 (t ), 1 where 1 (t ) = 2 /T cos(2 f t ), 0 t T c Signal space: E E
Err
Quiz 1 Solutions
EE230B Prof. Greg Pottie
1
2
s2 s1
(a) 4-QAM
1
s3
s4
May alternatively replace correlators with matched filters.
X
In phase bits X
dt
T
1(t)
X Quadrature bits
1(t)
X
dt
T
2(t)
Modu