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Frequency-division multiplexing, as shown in Fig. 9.19, is used to separate messages in the frequency domain and assign a distinct frequency slot to each message. Four messages, each with a bandwidth B of 4 kHz, are to be multiplexed by amplitude modulation (AM). For proper demultiplexing a guard band of 3 kHz is needed.
(a) If a low-pass filter with steeper cutoff characteristics could be used in demultiplexing, would the guard band have to be smaller or larger?
(b) Determine the lowest carrier frequencies to accomplish frequency-division multiplexing
(c) Determine the highest frequency component that the transmission system must be capable of propagating.
Calculate the magnetic flux density (including units) B→ at P, and the flux density when z >> a. (Note that z ≠ ∞ so you cannot say B = 0.) Use back of page if necessary.
illustrates how the forces can vary in problems of this type. A hiker, who weighs 739 N, is strolling through the woods and crosses a small horizontal bridge. The bridge is uniform, weighs 3250 N, and rests on two concrete supports
For the system below, assume a three phase-ground fault on bus 3 with the fault impedance of j0.005: Find the admittance matrix. Find all the fault currents, including the generators
Determine the response of the system when aunit step is applied at input.
Find the potential energy of the system of 3 charges.
Problem statement: A specialized piece of laboratory test equipment, called a spectrum analyzer,will be placed on a mobile push cart. The spectrum analyzer measures the amplitude of wireless signals as a function of frequency but may also be placed i..
Design a Mealy circuit has two inputs, X and Y, and two outputs, Z and W. If the two inputs are 0 at the previous clock rising-edge and then 1 at the next clock rising-edge, then an output Z = 1 (else Z = 0). If one of the inputs is set to 1 and t..
A new government law requires that the lead content of drinking water be less than 1.0 ppb. You are a safety engineer, and you have recently tested your companys drinking water using two methods. Method A gives a reading of 0.85 ppb
Hspice Netlist example, Often Netlist is generated by programs such as Cadence. However, on the rare occasions when one has to look at Hspice netlist
A negative feedback amplifier has a close-loop gain Af=100 and an open-loop gain A=105. What is the feedback factor If a manufacturing error results in a reduction of A to 103, what close-loop gain results
Determine the bandwidth of the modulator output if a power ratio, Pr, of 0.8 is needed. Repeat for a power ratio of 0.9.
The input/output relation of a discrete time system is given by y(n) = x(n+1) + x(n-3). Find an expression for h(n), the unit sample response of this system. specify how many non-zero terms there are in h(n).
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