Average capacity maximization via channel switching in the presence of additive white Gaussian noise channels and switching delays

Date
2016
Advisor
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Source Title
IEEE Transactions on Wireless Communications
Print ISSN
1536-1276
Electronic ISSN
Publisher
Institute of Electrical and Electronics Engineers Inc.
Volume
15
Issue
9
Pages
6228 - 6243
Language
English
Type
Article
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Abstract

The optimal channel switching problem is studied for average capacity maximization in the presence of additive white Gaussian noise channels and channel switching delays. First, an optimization problem is formulated for the maximization of the average channel capacity, considering channel switching delays and constraints on average and peak powers. Then, an equivalent optimization problem is obtained to facilitate theoretical investigations. The optimal strategy is derived and the corresponding average capacity is specified when channel switching is performed among a given number of channels. Based on this result, it is shown that channel switching among more than two different channels is not optimal. In addition, the maximum average capacity achieved by the optimal channel switching strategy is formulated as a function of the channel switching delay parameter and the average and peak power limits. Then, scenarios under which the optimal strategy corresponds to the exclusive use of a single channel or to channel switching between two channels are described. Furthermore, sufficient conditions are obtained to determine when the optimal single channel strategy outperforms the optimal channel switching strategy. The numerical results are presented to provide the examples of the theoretical results and to illustrate the effects of channel switching delays. © 2002-2012 IEEE.

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Keywords
Capacity, Channel switching, Switching delay, Time sharing
Citation
Published Version (Please cite this version)