How does this scenario differ from the users activity

Assignment Help Electrical Engineering

Reference no: EM13967896

Consider the uplink of a single-cell CDMA system with N users active all the time. In the text we have assumed the received powers are controlled such that they are exactly equal to the target level needed to deliver the desired SINR requirement for each user. In practice, the received powers are controlled imperfectly due to various factors such as tracking errors and errors in the feedback links. Suppose that when the target received power level is P, the actual received power of user i is EiP, where Ei are i.i.d. random variables whose statistics do not depend on P. Experimental data and theoretical analysis suggest that a good model for Ei is a log normal distribution, i.e., log(Ei) follows a Gaussian distribution with mean µ and variance a2.

1. Assuming there is no power constraint on the users, give an approximate expression for the achievable spectral efficiency (bits/s/Hz) to support N users for a given outage probability pout and cb/I0 requirement /3 for each user.

2. Plot this expression as a function of N for reasonable values of the parameters and compare this to the perfect power control case. Do you see any interference averaging effect?

3. How does this scenario differ from the users' activity averaging example considered in the text?

Reference no: EM13967896

Questions Cloud

Write an intergal that represents the area of surface : Write an intergal that represents the area of surface generated by revolving the curve about the x-axis. approximate the integral.

Associate the features of audience, purpose and text : Explain the reason for selecting topic three (3), identify the audience, and provide a preliminary thesis statement.

Give an expression for the detection error probability : Give an expression for the detection error probability for a mobile in soft handoff between two base-stations. You may need to make several simplifying assumptions here. Feel free to make them but state them explicitly.

How would the customer value change if the price increased : How would the customer value change if the price of the Canon A590 increased from $180 to $199? How much could the price of the Fuji J10 be increased if Fuji wanted the camera to have a $10 value advantage?

How does this scenario differ from the users activity : Assuming there is no power constraint on the users, give an approximate expression for the achievable spectral efficiency (bits/s/Hz) to support N users for a given outage probability pout and cb/I0 requirement /3 for each user.

Write a matlab script that solves ode : Write a matlab script that solves ODE: y' = 4/(1+x^2) using forward Euler's, improved Euler, classical Runge-Kutta, and Adams-Bashforth methods.

What is the limiting spectral efficiency as k and w grow : Outage occurs when the users are located such that the out-of-cell interference is too large. For a given outage probability pout, give an approximate expression for the spectral efficiency of the system as a function of K, a and /3.

Develop your speech based on the preparation : Write your speech using tips, techniques, and guidelines studied in the lesson.

Simplify the integral that gives the arc length of the curve : Write and simplify the integral that gives the arc length of the curve below on the given interval. y = sin2x [0, A?€/2)

User Account

All Pages