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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?
Determine the energy delivered to the resistor between t=0 and t=8. If the voltage across the same resistor is found to be v(t)=10sin(2pt) V, calculate the energy delivered to the resistor between t=0 and t=2s. The argument of the sine function (2p..
smoke detector was loaded with 0.2u Curie when purchased 20 years ago. The isotope is Am-241with a half-life of 426 years. How much remains today
Consider a coaxial transmission line that consists of inner andouter conductors of radii a and b, and is filled with an electroncloud with a volume charge density ofρv=γ/ρ[C/m3] fora
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The voltage across the load must remain between 4.7 and 5.0 V for all values of load current. Come up with (draw) a voltage-divider network to supply the load. You may assume that resistors of any value desired are available.
Modify the above VHDL code so that in addition to the 6 outputs listed above, the circuit outputs the largest and the smallest operands on the new outputs ‘largest' and ‘smallest'. Also output the sum, difference and product of the two operands A ..
A 3-phase, 440VAC, 6-pole, 60Hz, wye connected induction motor takes 30KVA at .8 power factor lagging, and runs at a slip of 3.5% at full load. The stator copper losses are 500W, and the rotational losses are 350W.
The concern is not just for the time-to-cool, but also for the maximum temperature difference within the plate. If this temperature difference is too large, the plate can experience significant warping.
Given the following array declaration, if the array is stored starting at address 1000, what is the output of the following statement? Assume the code is for a 32 bit processor such as a Pentium.
A 78oham lossless planar line was designed but did not meet a requirement. What fraction of the widths of the strip should be added or removed to get the characteristic impedance of 75oham
Find the max instantaneous power delivered by the source, dissipated by R, and absorbed by L. What are the smallest instants (t > 0) at which these maxima occur.
A 10-mV signal source having an internal resistance of 200 kO is connected to an amplifier for which the input resistance is 20 kO, the open-circuit voltage gain is 2000 V/V, and the output resistance is 1 kO. The amplifier is connected in turn t..
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