Vector Broadcast Channels: Optimal Threshold Selection Problem

Details Vector Broadcast Channels: Optimal Threshold Selection Problem Vector Broadcast Channels: Optimal Threshold Selection Problem

2011-03-24

arxiv.org/abs/1103.4687v1

Computer Science

Information Theory

Submitted to IEEE International Symposium on Information Theory, St. Petersburg, Russia, Aug 2011

Scientific paper

Threshold feedback policies are well known and provably rate-wise optimal selective feedback techniques for communication systems requiring partial channel state information (CSI). However, optimal selection of thresholds at mobile users to maximize information theoretic data rates subject to feedback constraints is an open problem. In this paper, we focus on the optimal threshold selection problem, and provide a solution for this problem for finite feedback systems. Rather surprisingly, we show that using the same threshold values at all mobile users is not always a rate-wise optimal feedback strategy, even for a system with identical users experiencing statistically the same channel conditions. By utilizing the theory of majorization, we identify an underlying Schur-concave structure in the rate function and obtain sufficient conditions for a homogenous threshold feedback policy to be optimal. Our results hold for most fading channel models, and we illustrate an application of our results to familiar Rayleigh fading channels.

Affiliated with

Also associated with

No associations

Rating

Vector Broadcast Channels: Optimal Threshold Selection Problem does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Vector Broadcast Channels: Optimal Threshold Selection Problem, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Vector Broadcast Channels: Optimal Threshold Selection Problem will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-47145