Reference no: EM132908982
Topics: Digital communication, Pulse code modulation, line code, Frequency shift keying, phase shift keying, Quadrature amplitude modulation, constellation.
Questions:
1) What do these terms stand for? CW, ICW, ASK, OOK, FSK, PSK.
2) What do these terms stand for? VCO, BPSK, DPSK, QPSK, MSK, GMSK.
3) Is ASK (Amplitude Shift Keying) usually used alone in digital communications?
4) An analog signal is sampled at 2KHz by a 3-bit A/D. If a full-scale voltage of A/D is 6V what is the binary sequence for 2.25V?
5) A unipolar signal is passed through an 8-bit A/D with 25 V, full scale voltage range. Find the step size of this quantizer.
6) 16 band-limited baseband channels with 4 kHz bandwidth are samples at their minimum periodic sampling rate and TDM multiplexed. After TDM multiplexing, a 16-bit A/D is used to generate the PCM signal. The minimum required bandwidth for transmission of PCM is 2.048 MHz. Is this a correct answer?
7) In a PPM (Pulse Position/Phase Modulation), the information is modulated on _______ of the pulse.
8) Where is the anti-aliasing filter used?
9) What happens to the distortion of a spectrum, if a bandlimited signal with 8 kHz bandwidth is sampled periodically using a 40 kHz pulse and its duty cycle of the sampling pulse is reduced from 30% to 5%.?
10) What is the main disadvantage of digital communications?
11) What is the resolution (quantization error) of an 8-bit A/D with 8V max voltage?
12) What are the main advantages of digital communications?
13) Does 4-bit A/D with 7 V, full scale voltage have a smaller or larger step size than an 8-bit A/D with the same full-scale voltage?
14) What is the disadvantage of PSK over DPSK?
15) A band-limited signal that has been sampled at a sampling rate more than twice of the BW of the signal is not reproducible from its samples, Is this a correct statement?
|
Organizational culture of zappos
: What do you like about it? How is it different from the culture of the Filipino organization? What do you think can it learn from us and what do you think can w
|
|
How does changes in accounting methods help
: Explain How does changes in accounting methods or policies help in increasing a firm's earnings growth and return rate to its equity investors?
|
|
Find how does investment in new acquisition help in firms
: Find how does investment in new acquisition or internal growth (such as, Plant, Property & Equipment, Inventories and Receivables) help in increasing a firm
|
|
Crime prevention through environmental design
: Crime Prevention Through Environmental Design (CPTED) is a major concept in physical security.
|
|
Digital communication-modulation and modems
: What do these terms stand for? CW, ICW, ASK, OOK, FSK, PSK. Is ASK (Amplitude Shift Keying) usually used alone in digital communications?
|
|
How does relate on planning and investing
: How does relate on planning and investing? Warren Buffett famously advised, "Only buy something that you'd be perfectly happy to hold.
|
|
What is the fixed cost per unit and variable cost per unit
: If the Flash corporation makes 400,000 units, what is the fixed cost per unit and variable cost per unit? Calculate the variable cost per unit.
|
|
Estimate the total variable electricity costs
: Estimate the total variable electricity costs and fixed electricity costs if 4600 machine hours are projected to be used next month
|
|
How can forecast a firm net operating assets
: Forecasting Net Operating Assets, How can you forecast a firm's Net Operating Assets? (Explain briefly.) What is the importance of forecasting a firm's NOA?
|