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In a multiuser CDMA system of DSSS, all transmitters are at equal distances from the receivers. The additive white Gaussian noise density Sn(f) = 5x10^-7 W/Hz. BPSK is used by all users with bit rate = 16 kb/s. There are 16 users.
(a) Assuming that the spreading codes Ci for the users are orthogonal, find the desired user power signal Pi to achieve Bit Error Rate = 10^-5.
(b) Now assume that the spreading codes are not orthogonal, specifically: Ri,i = 1 and Ri,j = -1/16; i does not equal j. Determine the required user signal power to achieve the same BER (10^-5).
An input signal of 10V at 0degrees and a frequency of 1592Hz is applied to a series RLC circuit with resistor R=100ohm, inductor L= 40mH, and a capacitor C=0.5uF. The value of the total circuit complex impedance is
A digital system has a clock generator that produces pulses at a frequency of 16 MHz. Design a circuit (draw the logic diagram) that provides a clock with a cycle time of 250 ns.
Suppose a 12-V battery bank rated at 200 Ah under standard conditions needs to deliver 600 Wh over a 12-h period each day. If they operate at -10 Celsius, how many days of use would they be able to supply
Lets assume that one electron is removed from each atom and these electrons are all removed from the penny to a distance such that the force of attraction between the positively charged penny and the removed group of electrons is 2.3 N.
3-phase-Y-connected load of 40,000W at 0.8 PF lag is supplied by a three-phase Y-connected source of 500V. Find the current and phase voltages. Assuming Van as ref. Determine Ian, Ibn, Icn, Vab, Vbc, and Vca in phasor form.
Two equal resistors R connected in series across a voltage source V dissipate power P. What would be the power dissipated in the same resistors when they are connected in parallel across the same voltage source
An alarm is powered by 120 VAC, and the on/off state of the alarm is controlled by an EM relay. Design the interface between a computer output port and the EM relay. The dropout voltage is 3.5 V, and the coil current needs at least 100 mA.
Define X and Y to be two discrete random variables whose joint probability mass function is given as follows: P(X = m, Y = n) = e^7*4^m*3^n?m / m!(n m)! , for m = 0, 1, . . . , n and n = 0, 1, 2, . . . , while P(X = m, Y = n) = 0
During the k^th sampling interval of a CVSD modulation scheme, the current value of input x(k) is 1000, the previous value of approximating staircase function x f(k-1) is 990, and the current value of ä(k-1) is 30
A terminated transmission line with Z0 = 60 ohm has a reflection coefficient at the load of = 0.4 60. (a) What is the load impedance (b) What is the reflection coefficient 0.3 away from the load (c) What is the input impedance at this point
Design a circuit with minimum number of gates for a binary multiplier that multiplies two unsigned four-bit numbers, Using Inverters, AND, OR gates and Full Adders.
When electros and holes are present in a semi-conductor, the presence of an electric field produced by an external voltage will cause this carries,which have changes of oposite sign, to move in opposite directions.
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