ECE 245/445: Wireless Communications
Fall 2012
Homework #2
Due: Thursday, October 11
1. Consider the following signal set for a digital communication system:
cfw_s1(t) = cos(t/T), s2(t) = sin(t/T), s3(t) = cos(t/T), s4(t) = sin(t/T) for 0 t T.
a. Determ
ECE 245/445: Wireless Communications
Fall 2012
Homework #3
Due: Thursday, October 25 in class
1. Using a CRC3 polynomial (1101), find the codeword for the message m = 101101. Suppose
the coded message m was sent and the received message is r=110111010. H
ECE 245/445: Wireless Communications
Homework #1
Fall 2012
Due: Thursday, September 27 in class
1.
If a mobile radio link operates with 30 dB SNR and uses a 200 kHz channel, find the
theoretic maximum data capacity possible. How does your answer compare t
ECE 245/445: Wireless Communications
Fall 2012
Homework #3
Due: Tuesday, October 30 in class
1. Using a CRC3 polynomial (1101), find the codeword for the message m = 101101.
Suppose the cod
ECE 245/445: Wireless Communications
Fall 2012
Homework#1 Solutions
1. If a mobile radio link operates with 30 dB SNR and uses a 200 kHz channel, find the
theoretic maximum data capacity possible. How does your answer compare to what is
offered by the GSM
Lecture 5:
Digital Modulation Part I
Signal Constellations
1
Digital Modulation
Analog information signal (e.g., speech waveform) is digitized
Bit stream mapped to sequence of symbols
2
Digital Modulation
E.g., bits mapped to the amplitude of a signal
Lecture 4:
Noise, Capacity, Analog Modulation
1
Channel Capacity
Impairments, such as noise, limit data rate
that can be achieved
For digital data, to what extent do
impairments limit data rate?
Channel Capacity:
the maximum rate at which data can be
Lecture 7:
Digital Modulation Part III
Binary and Mary Modulation
1
Binary Modulation
Onoff keying (OOK) / amplitudeshift keying
(ASK)
Change amplitude of carrier frequency
Binary frequency shift keying (BFSK)
Change carrier frequency
Binary phase
ECE 245/445: Wireless
Communications and Networking
TR 2:003:15, CSB 523
Instructor
Wendi Heinzelman
[email protected]
TA
Hoda Ayatollahi
[email protected]
Background
How much do you remember from 241 (signals) and
242 (communications
Lecture 6:
Digital Modulation Part II
Receivers and Pr(e) Analysis
1
Decoding Received Signal
2
Receivers
3
Receiver Structure
Do not know which si(t) sent, so how to design filter
hr(t)?
If more than one basis function for cfw_si(t), must perform
N mat
1. Consider the following signal set for a digital communication system:
cfw_s1(t) = cos(t/T), s2(t) = sin(t/T), s3(t) = cos(t/T), s4(t) = sin(t/T) for 0 t T.
a. Determine a set of orthonormal basis functions for this signal set. Prove that your selecte
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University of Rochester
Department of Electrical & Computer Engineering
ECE111
Laboratory #5
Simple 741 OpAmp Ckts
Weeks of October 30 and 31, 2014

Writeups must provide a detailed description of the exercise, including diagrams of all circuits and
de
1/2
University of Rochester
Department of Electrical & Computer Engineering
ECE111
Lab #4
Resistive Network Trimming
Oct. 23 or 24, 2014
Writeups, prepared in the format described previously, are due one week after you have demonstrated
your design to t
Lectures 2 and 3:
Propagation and Channel Modeling
1
Wave Propagation
Why do we need to have (at least) a
rudimentary understanding of wave
propagation?
Channel characteristics vary for different
environments
Allows system designer to predict signal co