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1. Consider the uplink of an IS-95 system.
a. A single cell is modeled as a disk of radius 1 km. If a mobile at the edge of the cell transmits at its maximum power limit, its received SNR at the base-station is 15 dB when no one else is transmitting. Estimate (via numerical simulations) the average sum capacity of the uplink with 16 users that are independently and uniformly located in the disk. Compare this to the corresponding average total throughput in a system with conventional CDMA decoding and each user perfectly power controlled at the base-station. What is the potential percentage gain in spectral efficiency by using the more sophisticated receiver? You can assume that all mobiles have the same transmit power constraint and the path loss (power)attenuation is proportional to r-4 .
b. Part (1) ignores out-of-cell interference. With out-of-cell interference taken into consideration, the received SINR of the cell edge user is only -10 dB. Redo part (1). Is the potential gain from using a more sophisticated receiver still as impressive?
A 35-year old female worker receives an x-ray exposure of 5.2 rad (whole-body) while carrying out emergency procedures in a nuclear accident. Discuss the health risks assumed by this worker as a result of the radiation exposure.
A student lifts a weight (W) using a motor powered by solar cells to determine the efficiency of the solar cell/motor system. On the power meter the voltage reads V and the current reads I. The student lifts the weight a distance H in a time T.
a. design a half-subtractor circuit with inputs x and y and outputs Diff and B out. the circuit subracts the bits x - y and places thedifference in Diff and the borrow in B out. b. design a full- subtractor circuit with three inputs x,y,B in andtwo..
q1 . for the given circuit r20k and c1200pfanbsp is the circuit lpf or hpf?b sketch the frequency response of the
Two stages are cascaded to result in an overall gain of 680 V/V.The loaded gain of the first stage is 36 dB. What must the gain ofthe second stage be in dB to satisfy this specification In V/V
Two loudspeakers, one of them generates sound 400W power the other with 100W. The sound is generated isotropically from each loudspeaker. A listener is seated 20 m from the 100 W loudspeaker and 40 m from the other loudspeaker.
basic column controlthe basic column control system shown in figure is somewhat more complicated than the basic
A)An amplifier has an input voltage of 0.5V and an output voltage of 12V.Calculate the increase in unit decibels. B)An amplifer has an input power 2W and an output power of 80W. Calculate the increase units of decibels.
An AC motor with impedance Z = 4.2 + j3.6 O is supplied by a 220 V, 60 Hz source. Determine the time average power delivered to the load.
An amplifier has an input signal, VIn = 250 V. The output voltage, VOut = 30 mV. What is the gain in dB for the amplifier at that frequency
In a certain transformer, the input power to the primary is 120 W. If 8.5 W are lost to the winding resistance, what is the output power to the load, neglecting any other issues
A flywheel with a moment of inertia of 4 kg × m2 is initially at rest. If a torque of 5 N × m (counterclockwise) is suddenly applied to the flywheel, what will be the speed of the flywheel after 5 s? Express that speed in both radians per second a..
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