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1. Consider the two-path example d = 2 km and the receiver at 1.5 km from the transmitter moving at velocity 60 km/h away from the transmitter. The carrier frequency is 900 MHz.
a. Plot in MATLAB the magnitudes of the taps of the discrete-time baseband channel at a fixed time t. Give a few plots for several bandwidths W so as to exhibit both flat and frequency-selective fading.
b. Plot the time variation of the phase and magnitude of a typical tap of the discrete- time baseband channel for a bandwidth where the channel is (approximately) flat and for a bandwidth where the channel is frequency-selective. How do the time-variations depend on the bandwidth? Explain.
2. For each tap of the discrete-time channel response, the Doppler spread is the range of Doppler shifts of the paths contributing to that tap. Give an example of an environment (i.e. location of reflectors/scatterers with respect to the location of the transmitter and the receiver) in which the Doppler spread is the same for different taps and an environment in which they are different.
An 8 - bit microcontroller has an external RAM with the memory map from 8000H to 9FFFH. what is The Number of bytes this RAM can store
Write a program to generate a 25-Hz digital waveform with a 50 percent duty cycle on the PT0 pin as long as the voltage level on the PP7 pin is high. Your program should consist of two parts: Entry test. As long as the PP7 pin is low, it stays in t..
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For a mixture of ethane 60%, acetylene 20%, and benzene 20% total mass of 250 kg is loaded into a reactor obeying the Carnot cycle, we want to know which produces more work when reacted with 25% fuel, 60% O2, 15% CO2 for 30 cycles.
Design a diode voltage regulator to supply 1.5V to a 150-ohm load. Use two diodes specified to have a 0.7-V drop at a current of 10mA. The diodes are to be connected to a +5-V supply through a resistor R.
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A magnetic pickup coil is being used to make measurements which areproportional to the time derivative of the magnetic flux density, dB/dt. You wishto integrate this signal to get the magnetic flux density, B.
What effect do internal capacitances in the transistor model have on practical performance of a real system? How would you use these model values to predict system performance?
Suppose we want to construct an amplifier with a closed-loop gain of 50. We want the gain to vary by no more than +/- 5% while the open-loop gain varies by +/- 50%. Determine the values for a and b that will satisfy these constraints.
(a) What is the magnitude of the average acceleration of a skier who, starting from rest, reaches a speed of 9.38 m/s when going down a slope for 3.89 s (b) How far does the skier travel in this time
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