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There are 100 video channels numbered 1 through 100. Is this system using FDM or FDMA?
Occasionally the hub has a voice message that is to be sent to all the mobile units. Can the message be sent on a single RF frequency?
Draw a fault tree for the top event "no flow out of the system."Find the minimal cutsets.
A DSSS-CDMA signal has a chip sequence that is 10,000 chips in length. The sequence repeats every millisecond. What is the chip rate?
A hard disk contains four Platters. Each side of the platter is coated with a magnetic oxide, allowing data to be stored on it.
A microwave radio link operates over a bandwidth of 400 MHz at C band. The link carries a number of channels of data using FDMA.
Figure shows the block diagram of a superhetrodyne radio receiver. In a test a 20 uV signal was fed from the aerial into the first stage of the receiver.
As a rule of thumb, the perceived noise from a source falls by 6 dBA with every doubling of the distance from the source.
A simplified model of ADC noise refers the noise to a noisy input source resistance Rn while assuming the rest of the signal path to be noiseless.
Assume that at t = 70, B revokes the access right from C. Using the conventions, show the resulting diagram of access right dependencies.
A continuous time signal x(t) has the Fourier transform X(?) = 1/(j?+b) where b is a constant. Determine the Fourier transform for v(t) = x(t) * x(t).
Explain the operation of the circuit and in particular the role of resistors R1 and R2.
Compute the unit-pulse response h[n] for the discrete-time system y[n+2]2y[n+1]+y[n]=x[n] (for n = 0, 1, 2, 3).
A 415 V, 3-phase generator supplying a 3-phase 415/110 V transformer. Draw the individual and combined impedance diagrams to a base of 10 kVA.
See the drawing showing proportional plus derivative controller that has a proportional band of 20% and a derivative action time of 0.1 minutes.
The heater is driven from a voltage-controlled power supply, the voltage V1 being derived from a potentiometer.
How are mutual transconductance, ß and a of a BJT transistor related to each other? What role do these parameters play in circuit design?
Sketch the waveform defined below and explain how you would obtain its Fourier series, develop the analysis as far as you are able.
If the efficiency of the motor and drive system is 80% and it is fed through a transistor regulator at 12V.
Design a half-wave unregulated power supply to give VL = 15V at IL = 10mA with deltav <= 0.1V. Assume a 120V, 60Hz supply.
A white Gaussian noise process X(t) with power spectral density (PSD) N0/2=0.1 is input to an LTI filter with a transfer function H(f) given by.
In order to charge a battery there must be a potential difference between the charger and the battery, i.e.a charging voltage.
What would be your revised estimate of failure rates of the components in your system?
On propagation related problems within the theatre and the positioning of transmit and receive antennas and "space diversity" reception.
Conservation of energy requires that the sum of the power absorbed by all the elements in a circuit be zero.