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The optimal power allocation with full CSI in the symmetric uplink with the assumption that there is always a unique user with the strongest channel at any one time. This assumption holds with probability 1 when the fading distributions are continuous. Moreover, under this assumption, the solution is unique. This is in contrast to the uplink AWGN channel where there is a continuum of solutions that achieves the optimal sum rate, of which only one is orthogonal. We will see in this exercise that transmitting to only one user at a time is not necessarily the unique optimal solution even for fading channels, if the fading distribution is discrete (to model measurement realities, such as the feedback of a finite number of rate levels).
Consider the full CSI two-user uplink with identical, independent, stationary and ergodic flat fading processes for the two users. The stationary distribution of the flat fading for both of the users takes one of just two values: channel amplitude is either at 0 or at 1 (with equal probability). Both of the users are individually average power constrained (by P¯ ).
Calculate explicitly all the optimal joint power allocation and decoding policies to maximize the sum rate. Is the optimal solution unique? Hint: Clearly there is no benefit by allocating power to a user whose channel is fully faded (the zero amplitude state).
implementation of the projectin this project we are implementing the analog and digital modulation techniques.analog
The balanced 60Hz waveform sample that we must modulate is the point where t=4.4ms. The DC voltage from rail to rail is 300V. assume the q axis and a axis are in same direction. The use of mathCAD is recommended.
If a radio ran for 3 hours on a cheap battery rated at2Ah, how long will the radio run on a battery rated at 5Ah
A temperature sensor has a static transfer function of 0.15mV/C and a time constant of 3.3s. If a step change of 22 degrees to 50 degrees C is applied at t=0, find the output voltages at .5s, 2.0s, 3.3s, and 9s. What is the indicated temperature a..
Design a circuit to supply a -2.5 reference voltage as the input to a voltage follower if only 9 V batteries are available. Use an In4740 diode, which has a Zener voltage of 10 v at a current of 25 mA.
2) A device that responds to a small current or voltage change by activating a mechanical switch allowing a larger amount of current flow is 3) Where does a program transfer to when an interrupt occurs Interrupt vector table Interrupt service ro..
CDMA is a multiple access technique to allow multiple users to share the same bandwidth, based on the orthogonality of their spreading codes. CDMA is a descendent of the direct sequence spread spectrum (DSSS) technology designed for antijam (AJ).
We use the time constant to characterize transients in electric circuits. In physics, the half-life is often used to characterize the exponential decay of physical quantities such as radioactive substances.
Three amplifiers with power gains of 15, 22, and 7 are cascaded. The input power is 120 µW. What is the output power of the final amplifier stage
The controlled variable in a closed-loop system is the direction of a robot arm. Initially, it is at 40o; then it is commanded to go to 22o. What is the error when the arm position is at 15o
A 10-V battery supplies a constant current of 0.5amp to a resistance for 30 min (a) Determine the resistance, in ohms,
The voltage v and the current i are two independent RVS with ηv = 110v, σv = 2v, ηi = 2A, σi = .1A Using Taylor series approximation find approximate the mean ηw and the standard deviation σw of the power w = vi
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