DocumentCode :
3168032
Title :
ENPA and EBPA models for primary user activity based power allocation in cognitive systems
Author :
Goonewardena, Mathew ; Rajatheva, Nandana ; Chahed, Tijani ; Zeghlache, Djamal
Author_Institution :
Asian Inst. of Technol., Pathumthani, Thailand
fYear :
2011
fDate :
11-14 Sept. 2011
Firstpage :
671
Lastpage :
675
Abstract :
This paper addresses the problem of power allocation of the downlink in cognitive radio networks (CRNs). In a CRN the channel availability for the secondary users (SUs) is a random process determined by primary user (PU) behavior. In an overlay CRN where the PU has the priority and CRN may use only the idle channels, CRN loses the symbols that are being transmitted during that time slot when the PU takes the channel and if the error correction code cannot handle the length of symbol loss. Further, in the next time slot, the CRN has to select again a free channel to continue the communication or in the event that all channels are occupied by PUs and other SUs it enters an indefinite waiting process. Thus it is intuitive that the time averaged data rate of the CRN does not only depend on the channel characteristics (governed by Shannon´s law) but also on the channels´ PU activity level. CRNs, with the spectrum sensing capabilities inherent to them, have the ability to characterize those activity statistics. In this paper, we propose two schemes named ENPA (equivalent noise of PU activity) and EBPA (effective bandwidth of PU activity), which take into account the PU activity in CRN downlink power allocation. These schemes are shown to achieve higher average rates than the water-filling algorithm which is optimal for a linear filter channel.
Keywords :
cognitive radio; error correction codes; radio networks; CRN downlink power allocation; EBPA model; ENPA model; Shannon law; channel availability; channel characteristics; cognitive radio networks; cognitive systems; error correction code; linear filter channel; primary user activity; secondary users; spectrum sensing; symbol loss; water-filling algorithm; Bandwidth; Cognitive radio; Interference; Noise; Numerical models; Receivers; Resource management; Cognitive Radio; Effective Bandwidth Model; Equivalent Noise Model; Power Allocation; Primary User Activity;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Personal Indoor and Mobile Radio Communications (PIMRC), 2011 IEEE 22nd International Symposium on
Conference_Location :
Toronto, ON
ISSN :
pending
Print_ISBN :
978-1-4577-1346-0
Electronic_ISBN :
pending
Type :
conf
DOI :
10.1109/PIMRC.2011.6140048
Filename :
6140048
Link To Document :
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