By Topic

Optimizing the Power Allocation for Rayleigh Block-Fading Channels with Outage Capacity Constraints

Sign In

Cookies must be enabled to login.After enabling cookies , please use refresh or reload or ctrl+f5 on the browser for the login options.

Formats Non-Member Member
$33 $13
Learn how you can qualify for the best price for this item!
Become an IEEE Member or Subscribe to
IEEE Xplore for exclusive pricing!
close button

puzzle piece

IEEE membership options for an individual and IEEE Xplore subscriptions for an organization offer the most affordable access to essential journal articles, conference papers, standards, eBooks, and eLearning courses.

Learn more about:

IEEE membership

IEEE Xplore subscriptions

1 Author(s)
Kai-Kit Wong ; Univ. College London, London

This letter studies the power distribution over K blocks of coded information to support a certain rate in Rayleigh- fading channels given the causal channel state information at the transmitter (CSIT). For K = 2, we shall show that since the channel in the future is random, the optimal power policy tends to pour all the power for the first block, which disables the time diversity. By introducing outage capacity as a constraint, time-diversity can be unleashed by stochastically distributing the power among the blocks. For K = 2, we derive the stochastic- optimal power allocation in closed-form for the transmit power minimization problem subject to an outage capacity constraint. For K > 2, we propose to minimize the power by constraining the upper bound of the outage probability, and in so doing, the problem is convex which permits to derive the optimal power policy. Numerical results demonstrate that the proposed power policy exploiting CSIT gives significant power reduction when compared to an equal-power policy.

Published in:

IEEE Transactions on Wireless Communications  (Volume:6 ,  Issue: 9 )