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Images and Matrices
Images are generally represented using matrices.
A matrix element is called pixel.
Grayscale images: 0 (black)-255 (white)
thms 2015, 8
Color images: 3 matrices representing the amount of
ECEN 621 - HW#6: Please answer the following questions:
Due on Tuesday, Nov. 24, 2015, in class. (No late homework accepted)
Eq. (2.2.6) is given as follows:
r t h , t xt d
d. Plot the received signal at the wireless channel ou
1. A computer network is a telecommunication network which allows
computers to exchange data with each other along network links. It is
used to link users within defined parameters; it's also used to store,
1. a. Scope of a LAN is smaller
LAN interconnects devices within a single building or cluster of buildings
b. LAN usually owned by organization that owns the attached devices
For WANs, most of network assets are not owned by
ECEN 621 HW4
1. QoS stands for Quality of Service.
Soft guarantee: A resource allocation within the priority transmission system which
allows QoS parameters in the priority transmission system to be adjusted along with
What are the main causes for wireless channel disturbances/corruptions? The
main causes include:
Multipath delay spread
Doppler spread due to motion
Signal fading of frequency-selective and non-frequency-selective vari
1. a. Analog signals can be converted into digital signals by using a modem.
b. Digital signals use binary values to send and receive data between computers.
c. Digital signals are easier and more reliable to transmit wit
ECEN 621 - HW#6:
Kiran Kumar G V, UIN: 425001410
For a linear time-invariant channel with impulse response () , given the channel input
(), the channel output is () = () (). Verify that this channel input-output
relation is a special case of
1) What are major functions of computer networks?
Ans) A computer network is a telecommunications network which allows computers to exchange
data. Its main functions include sharing of information and establishing of communication to the
Breaking up packets into small sizes decreases transmission
time because transmission is allowed to overlap. But Making
the packets too small, transmission time starts increases.
Because Each packet requires a fixed header; the more
ECEN 621 - HW#2: Please answer the following questions:
Due on Nov. 10, 2015, in class. (No late homework accepted)
1) What are the differences between analog and digital signals?
2) What are three important characteristics of a periodic signal?
3) What a
ECEN 621 - HW#5: Please answer/solve the following questions:
Due on Tuesday, November 24, 2015, in class. (No late homework accepted)
What are the main causes for wireless channel disturbances/corruptions?
Define the scatterers in wi
Applications of Sherman-Morrison Formula and Positive
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Sherman-Morrison Formula (Matrix Inverse Lemma)
Assume A Rnn is invertible and x, y Rn .
Rank-1 perturbation B = A + xyT . What is the inverse of B?
ECEN 601: Mathematical Foundations for Signal Processing
Due date: Tuesday, November 22, 2016
Problem 1 (10pts): Determine the absolute error and the relative error in computing the
value of e10 using the approximation
ex = 1 + x +
Medium Access Control
Protocols, Local Area Networks,
and Wireless Local Area
Part III: 802.11 Wireless LAN
ECEN 621 , Prof. Xi Zhang
Wireless Data Communications
Wireless communications compelling
Easy, low-cost deployment
Mobility & roaming: Ac