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| what is a communication system? |
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Definition
| system that transfers info |
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Definition
1. compress
2. add controlled redundancy to optimize message detection for receiver |
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Definition
1. convert input to format suitable for transmission
2. reduce noise and interference
3. facilitate channel assignment |
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| what's modulation + demodulator called? |
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Definition
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| what's encoder + decoder called? |
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Definition
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| what's transmitter + receiver called? |
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Definition
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| what are 2 design criteria for when designing a communication system? give 2 sub-criteria for both |
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Definition
1. efficiency: bandwidth, power
2. accuracy: bit error, low implementation cost |
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Term
| what's power of a signal? |
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Definition
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Definition
| signal that has finite power, this means energy is infinity |
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| what's energy of a signal? |
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Definition
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Definition
| signal that has finite energy, this mean power is 0 |
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| give equations for Fourier Expansion |
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Definition
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Term
| what's relationship between delta(w) and delta(f)? |
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Definition
| delta(w) = 2 * pi * delta(f) |
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| give Fourier Transform for G(f) and G(w) and their inverse transform |
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Definition
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| give 7 properties of Fourier Transform |
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Definition
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| give 3 properties of Delta function |
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Definition
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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? |
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Definition
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| give a system of DSB-SC. Compare carrier signal, output signal, and envelop with DSB-LC |
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Definition
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| what's the difference of DSB-SC using Coherent Detector(local oscillator and is synchronous) and not using Coherent Detector(local oscillator) |
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Definition
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Term
| what's quadriple carrier muxing used for? How to mod it and demod it? |
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Definition
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Term
| compare Coherent Detector and Cotas Receiver |
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Definition
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| draw a block diagram for cotas receiver |
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Definition
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Term
| what's definition of Hilbert Transform? What's the effect of it? |
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Definition
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Term
| In SSB, what's F+(w) and F-(W)? |
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Definition
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Term
| Represent F(w) using F+(w) and F-(w) |
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Definition
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Term
| Represent hilbert[F(w)] using F+(w) and F-(w) |
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Definition
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| Represent thi+(t) using f(t) and hilbert[f(t)] for SSB. What's is spectrum? |
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Definition
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Term
| draw a diagram for SSB modulation |
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Definition
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Term
| draw a diagram for SSB demodulation. What does SSB demodulation require? |
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Definition
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Term
| For signal that's cos[(Wc+deltaW)t]+cos(delta t + theta) after LPF, which is passed? |
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Definition
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Definition
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Term
| what is distoriont(deats)? |
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Definition
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| 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? |
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Definition
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