Shared Flashcard Set

Details

ECE318 concepts pre-midterm
ECE318 concepts pre-midterm
33
Communication
Undergraduate 3
04/07/2012

Additional Communication Flashcards

 


 

Cards

Term
what is a communication system?
Definition
system that transfers info
Term
what's encoder?
Definition
1. compress
2. add controlled redundancy to optimize message detection for receiver
Term
what's modulator?
Definition
1. convert input to format suitable for transmission
2. reduce noise and interference
3. facilitate channel assignment
Term
what's modulation + demodulator called?
Definition
modem
Term
what's encoder + decoder called?
Definition
codec
Term
what's transmitter + receiver called?
Definition
transceiver
Term
what are 2 design criteria for when designing a communication system? give 2 sub-criteria for both
Definition
1. efficiency: bandwidth, power
2. accuracy: bit error, low implementation cost
Term
what's power of a signal?
Definition
Term
what's power signal?
Definition
signal that has finite power, this means energy is infinity
Term
what's energy of a signal?
Definition
Term
what's energy signal?
Definition
signal that has finite energy, this mean power is 0
Term
give equations for Fourier Expansion
Definition
Term
what's relationship between delta(w) and delta(f)?
Definition
delta(w) = 2 * pi * delta(f)
Term
give Fourier Transform for G(f) and G(w) and their inverse transform
Definition
Term
give 7 properties of Fourier Transform
Definition
Term
give 3 properties of Delta function
Definition
Term
For DSB-LC, what's equation for carrier? what's the output?
How does spectrum of output look like?
under what condition there is no over modulation?
Definition
Term
give a system of DSB-SC. Compare carrier signal, output signal, and envelop with DSB-LC
Definition
Term
what's the difference of DSB-SC using Coherent Detector(local oscillator and is synchronous) and not using Coherent Detector(local oscillator)
Definition
Term
what's quadriple carrier muxing used for? How to mod it and demod it?
Definition
Term
compare Coherent Detector and Cotas Receiver
Definition
Term
draw a block diagram for cotas receiver
Definition
Term
what's definition of Hilbert Transform? What's the effect of it?
Definition
Term
In SSB, what's F+(w) and F-(W)?
Definition
Term
Represent F(w) using F+(w) and F-(w)
Definition
Term
Represent hilbert[F(w)] using F+(w) and F-(w)
Definition
Term
Represent thi+(t) using f(t) and hilbert[f(t)] for SSB. What's is spectrum?
Definition
Term
draw a diagram for SSB modulation
Definition
Term
draw a diagram for SSB demodulation. What does SSB demodulation require?
Definition
Term
For signal that's cos[(Wc+deltaW)t]+cos(delta t + theta) after LPF, which is passed?
Definition
Term
what is attenuation?
Definition
Term
what is distoriont(deats)?
Definition
Term
Draw a diag for VSB modulation and demodulation. what's carrier signal, output signal. Under what circumstance there is no distortion. Why use VSB over SSB for some cases?
Definition
Supporting users have an ad free experience!