2/16/2010
Vestigial Sideband Modulation (VSB)
Motivation: It is hard to implement a bandpass filter with sharp frequency cutoff; a phase shifter is realizable only approximately. Solution: VSB is relatively easy to generate and requires a bandwidth of 25
3/5/2010
Random Processes
A Random Variable that is a function of time is called a Random Process. A Random Process X(t,) is a collection (ensemble) of all possible sample functions (waveforms) of the random variable X(t). A Random Process is a collectio
1/6/2010
Signals and Systems
EE314: Lecture 2 Review of Signals
A signal is a set of information or data, and mathematically represented by a function of time. A system is a combination of devices and networks to perform a desired operation on signals.
S
1/27/2010
Review on Fourier Transform
Figure 3.15 Near symmetry between direct and inverse Fourier transforms.
Modern Digital and Analog Communication Systems
Lathi Copyright 2009 by Oxford University Press, Inc.
Fourier Transform Pairs
Some Common Signal
EE 314 Course Notes
1)
What is communication?
Communication is the process if t ransforming information from one location to another. Comunication Systems t ransfer information electronically over commnication channels Channel Types: voice, text, image, v
Additional Notes on Bandpass Random Process
8/13/10
Example on Bandpass Random Process
A white noise process of PSD N/2 is transmitted through a bandpass filter H(f). Represent the filter S n ( f ), S n ( f ), nc2 , s2 , and output n(t) in terms of quadra
3/3/2010
Bessel Function
Angle Modulation and Demodulation
AM vs. FM
Single tone modulation with fc=1kHz, fm=50Hz.
AM vs. FM for Single Tone Modulation
=0.1
1
3/3/2010
Example
Estimate BFM and BPM for the modulating signal m(t) for kf=2x105 and kp=5 . A
1/27/2010
Chapter 3: Analysis and Transmission Of Signals
Review of Fourier Transform Signal Transmission Through A Linear System Filters Signal Distortion The Energy Spectral Density and Power Spectral Density
Signal Transmission Through A Linear System
2/4/2010
Double-Sideband Suppressed-Carrier (DSB-SC) Modulation
Amplitude Modulations and Demodulations
DSB-SC Demodulation
Nonlinear Modulator
1
2/4/2010
Ring Modulator
AM Signal And Its Envelop
Rectifier Detector for AM
Envelop Detector for AM
2
2/4/201