Paper Info
Title
Ergodic capacity of multiuser scheduling in cognitive radio networks: analysis and comparison.
Abstract
This paper analyzes the ergodic capacity of secondary point-to-multipoint communications under the outage constraint of multiple primary user receivers PU-Rxs and the secondary user SU maximum transmit power limit. We first derive analytical expressions of the ergodic capacity for three scheduling schemes, that is, round robin, Max-signal-to-interference-plus-noise-ratio Max-SINR and Min-SINR, and compare their performance. Numerical examples show that when the number of SU receivers SU-Rxs increases in the presence of a single PU-Rx and at high SINR, the Min-SINR outperforms the Max-SINR scheme. As the number of PU-Rxs increases, the Max-SINR performs better than the Min-SINR scheduling. When the number of SU-Rxs becomes large, the system capacity is enhanced but so is the feedback load. To exploit the Max-SINR transmission while reducing the feedback load, we assume a threshold based on the channel quality where the SU-Rxs with the instantaneous SINR above the threshold participate in the Max-SINR scheduling; otherwise, an SU-Rx is selected randomly. Then, an analytical expression of the average capacity is derived. Numerical results illustrate that the capacity with limited feedback is approximately the same as for the case of Max-SINR with full feedback when the SU threshold for feedback condition is set to low and medium values. Copyright © 2016 John Wiley & Sons, Ltd.
Year
DOI
Venue
2016
10.1002/wcm.2722
Wireless Communications and Mobile Computing
Keywords
Field
DocType
underlay cognitive radio network,multiuser scheduling,ergodic capacity
Transmitter power output,Expression (mathematics),Scheduling (computing),Computer science,Ergodic theory,Communications system,Communication channel,Computer network,Exploit,Distributed computing,Cognitive radio
Journal
Volume
Issue
ISSN
16
16
1530-8669
Citations 
PageRank 
References 
1
0.36
28
Authors
2
Name
Order
Citations
PageRank
Louis Sibomana1374.66
Hans-Jürgen Zepernick254051.24