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Many communication systems connecting computers employ a technique known as "packet transmission." In this type of system, a collection of binary digits (perhaps 1000 of them) are grouped together and transmitted as a "packet." The time interval between packets is a random variable that is usually assumed to be exponentially distributed with a mean value that is the reciprocal of the average number of packets per seconds that are transmitted. Under some conditions it is necessary for a user to delay transmission of a packet by a random amount that is uniformly distributed between 0 and T. if a user is generating 100 packets per second, and his maximum delay time, T , is 1 ms, find :a) The probability density functions of the time interval between packets.b) The mean value of the time interval between packets.
Consider a communication strategy over the AWGN channel where for a fraction of time α, a capacity-achieving code at power level P1 is used, and for the rest of the time a capacity-achieving code at power level P2 is used
Formulate the differential equation model for a motor having inductance L and rotational inertia J, and electrical resistance Rw and frictional resistance Rf, driving a frictional load, Rl.
Assume the initial state is steady (y = 0 at t = -0) a) Determine the transfer function of this process in the s domain. b) If the input is a ramp change in u(t) = 4t, determine the value of y(t) when t = 10s.
Assume that an additional inductance can be inserted in series with the load. Also assume that the converter has no freewheeling diodes. Calculate the added inductance that leads to a conduction period of 180 degrees when alpha = 30 degrees.
Sketch magnitude and phase responses (as linear gain versus digital frequencies) for each filter (use [0,π]). Indicate filter type. Find cutoff frequencies if sampling frequency in 30 kHz. Use 6 points only. Do not use MATLAB.
Consider a long wire represented as distributed RC sections. The total wire length is 5mm. To reduce the wire delay, we uniformly insert n buffers along the wire. Suppose r=12Ohms/m and c=0.2fF/m and the delay of each buffer is 1ns.
The transfer equation is V_out/V_in. if you factor the second order polynomial what are the two first order polynomials. How do these compare with the first order filter. Has the -3db changed.
Signal w(t) is input to the filter. This signal is white noise, with PSD = N0/2. If we denote the filter output as n(t), what is the power in n(t) We input v(t) + w(t) into the filter, where v(t) = Ac cos(2pif0t). If Ac=4, what is the output signal..
If we want to correct the power factor to 0.9 lagging, what is the value of Q we need to inject.
The voltage V across a semi conductor in a computer is given by V= aI+BI^2, where I is the current (in A). If a 24 V battery is conducted across the semi conductor, find the current if a=4 ohms and B= 0.5 ohms/A.
A given device has been determined that it attenuates 4.8dB in power from its input terminal to its output terminal. What is the output power in watts if a 150-W input has been launched into a system that has two of this type of devices
Filament 1 is on the left, filament 2 is in the middle, and filament 3 is on the right. Filaments 1 and 2 have currents of 1 A in the ba z direction, and filament 3 has a current of 2 A in the ba z direction
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