Paper Info
Title
Energy-efficient exploration and exploitation of multichannel diversity in spectrum sharing systems.
Abstract
This letter investigates the problem of energy-efficient exploration and exploitation of multichannel diversity in spectrum sharing cognitive radio systems where the secondary user sequentially explores the channel state information on the licenced channels with time and energy consumptions. As the number of the explored channels increases, the achieved multichannel diversity gain increases and so does the exploration consumption. Thus, there is a fundamental tradeoff between the multichannel diversity gain and channel exploration overhead. To maximise the expected normalised capacity of the secondary user, we formulate this tradeoff as an optimal stopping problem and propose a myopic one-stage look-ahead rule to solve it. It is shown that the one-stage look-ahead rule is optimal in the low power region; moreover, it also has good performance in general power region. Simulation results show that the achievable normalised throughput differs greatly for different exploration overhead, which can be regarded as a distinct feature of spectrum sharing systems. Copyright (c) 2012 John Wiley & Sons, Ltd.
Year
DOI
Venue
2012
10.1002/ett.2527
TRANSACTIONS ON EMERGING TELECOMMUNICATIONS TECHNOLOGIES
Keywords
Field
DocType
spectrum sharing,cognitive radio,multichannel diversity,optimal stopping rule
Diversity gain,Mathematical optimization,Optimal stopping,Efficient energy use,Simulation,Communication channel,Throughput,Engineering,Spectrum sharing,Cognitive radio,Channel state information
Journal
Volume
Issue
ISSN
23
8
1124-318X
Citations 
PageRank 
References 
4
0.49
8
Authors
6
Name
Order
Citations
PageRank
Yuhua Xu185769.31
Liang Shen223612.22
Alagan Anpalagan31263125.52
Qi-hui Wu41383102.61
Jin-Long Wang5140294.86
Yitao Xu6608.50