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1. (Selective feedback) The downlink of IS-856 has K users each experi- encing i.i.d. Rayleigh fading with average SNR of 0 dB. Each user selectively feeds back the requested rate only if its channel is greater than a threshold y. Suppose y is chosen such that the probability that no one sends a requested rate is E. Find the expected number of users that sends in a requested rate. Plot this number for K = 2, 4, 8, 16, 32, 64 and for E = 0 1 and E = 0 01. Is selective feedback effective?
2. About channel measurement, prediction and feedback are based on an FDD system. Discuss the analogous issues for a TDD system, both in the uplink and in the downlink.
what are the advantages and disadvantages of using PLDs, including FPGAs, as compared to using discreet logic-integrated circuit chips
A 4800 bps data transmission device has a bit error rate of 10-6 normally. During a test period, it works at normal conditions except that a 1000ms impulse saturates the channel and all data is lost. Calculate the average bit error rate within the..
a wheat stome bridge has following ab 20 ohm bc 24ohm cd 5 ohm da 50 ohm bd 3 ohm. adca voltage source of 220v
Assume that the size of each track is the same. Compute the size of each cylinder on the disk both in terms of the number of bytes and the number of blocks. Also, compute the size of each track.
Design a BCD-to-7-segment decoder/driver (code converter) by using two different VHDLs (two projects - one low elvel and one high level) You need to turn in vhdl codes, testbench codes, simulation waveforms
A 5 GHz parallel polarized wave with amplitude 5 V/m is oblique incident from an air of (z 0. The angle of incidence is 53.13 deg. What is the transmission angle
The figure shows a circuit with five elements. If p1 = -209 W, p2 = 66 W, p4 = 26 W calculate the power p3 received or delivered by elements 3.
Given: A 13.8 kV circuit has a load of 6000 kVA with a lagging power factor of 0.8. Required: How much capacitive reactive power is needed to correct the power factor to 0.92 lagging
Design the basic cell of a universal shift register to the following specifications. The internal storage elements will bepositive edge-triggered D flip-flops. Besides the clock, theshifter stage has two external control inputs, S0 andS1, and thre..
Assume the coil around the toroid is one single coil and extends all the way around. A toroid is like a donut with a circular cross section. The following characteristics are given: Toroid material = sheet steel, N = 250 turns Inner Radius
Two identical automobile headlamps are connected across a 12v battery. if the total current from the battery is measured to be 6.5 A, what is the current through each headlamps
What is the impact of EMI on fiber optic cables?
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