DocumentCode :
55294
Title :
Increased Spectrum Access Opportunities for Secondary Users Exploiting Adaptive Modulation in Primary Links
Author :
Yuli Yang ; Aissa, Sonia
Author_Institution :
Dept. of Electr. & Electron. Eng., Meliksah Univ., Kayseri, Turkey
Volume :
64
Issue :
7
fYear :
2015
fDate :
Jul-15
Firstpage :
2911
Lastpage :
2924
Abstract :
In this paper, we develop a unified framework for transmission design and performance analysis of secondary users (SUs) in cognitive radio networks where adaptive modulation is adopted by primary users (PUs). With the developed framework, the interference from a secondary transmitter (ST) to a PU is considered. To promise the primary´s quality of service (QoS), the ST´s transmit power is allocated based on the gap between the effective signal-to-noise power ratio (SNR) received at the PU and the lower SNR boundary of the modulation mode that is being used by the PU. As such, the achievable data rate over the secondary link is quantified with closed-form expressions by taking into account different capabilities of the ST. Moreover, we investigate two scenarios for the primary´s implementation of adaptive modulation: the scheme with feedback of the channel quality and the scheme with modulation mode feedback. For the latter, the ST has to suppose a value as the primary´s channel quality, and the PU´s service outage probability is defined. Numerical results substantiate the validity of the developed framework and the performance analysis conducted. Interestingly, our results indicate that the higher the peak transmit power an ST can offer, the better performance the overall network can achieve, not only for SUs but for PUs as well.
Keywords :
adaptive modulation; cognitive radio; feedback; probability; quality of service; radio links; radio spectrum management; radio transmitters; telecommunication network reliability; wireless channels; PU service outage probability; QoS; SNR; ST transmit power allocation; adaptive modulation; channel quality feedback; cognitive radio network; modulation mode feedback; primary user link; quality of service; secondary transmitter; secondary user; signal-to-noise power ratio; spectrum access opportunity; unified framework; Adaptive systems; Feeds; Indexes; Interference; Modulation; Quality of service; Signal to noise ratio; Achievable data rate; adaptive modulation; cognitive radio (CR); interweave; service outage probability; spectrum sharing; underlay;
fLanguage :
English
Journal_Title :
Vehicular Technology, IEEE Transactions on
Publisher :
ieee
ISSN :
0018-9545
Type :
jour
DOI :
10.1109/TVT.2014.2354074
Filename :
6891345
Link To Document :
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