Optimum power randomization for the minimization of outage probability

Date

2013

Editor(s)

Advisor

Supervisor

Co-Advisor

Co-Supervisor

Instructor

BUIR Usage Stats
1
views
19
downloads

Citation Stats

Series

Abstract

The optimum power randomization problem is studied to minimize outage probability in flat block-fading Gaussian channels under an average transmit power constraint and in the presence of channel distribution information at the transmitter. When the probability density function of the channel power gain is continuously differentiable with a finite second moment, it is shown that the outage probability curve is a nonincreasing function of the normalized transmit power with at least one inflection point and the total number of inflection points is odd. Based on this result, it is proved that the optimum power transmission strategy involves randomization between at most two power levels. In the case of a single inflection point, the optimum strategy simplifies to on-off signaling for weak transmitters. Through analytical and numerical discussions, it is shown that the proposed framework can be adapted to a wide variety of scenarios including log-normal shadowing, diversity combining over Rayleigh fading channels, Nakagami-m fading, spectrum sharing, and jamming applications. We also show that power randomization does not necessarily improve the outage performance when the finite second moment assumption is violated by the power distribution of the fading. © 2013 IEEE.

Source Title

IEEE Transactions on Wireless Communications

Publisher

IEEE

Course

Other identifiers

Book Title

Keywords

Power randomization, Channel distribution information at the transmitters, Continuously differentiable, Outage probability, Power randomization, Randomization problems, Transmission strategies, Wireless communications, Jamming, Probability density function, Random processes, Rayleigh fading, Telecommunication, Wireless telecommunication systems, Outages

Degree Discipline

Degree Level

Degree Name

Citation

Published Version (Please cite this version)

Language

English

Type

Article