DocumentCode :
1453753
Title :
Sensing Based Joint Rate and Power Allocations for Cognitive Radio Systems
Author :
Wu, Yuan ; Tsang, Danny H K ; Qian, Liping ; Meng, Limin
Author_Institution :
Coll. of Inf. Eng., Zhejiang Univ. of Technol., Hangzhou, China
Volume :
1
Issue :
2
fYear :
2012
fDate :
4/1/2012 12:00:00 AM
Firstpage :
113
Lastpage :
116
Abstract :
In this paper, we propose a spectrum sensing based joint rate and power allocation scheme for Cognitive Radio (CR) systems. By exploiting both its sensing result and sensing accuracy, the Secondary User (SU) adaptively determines its transmission policy to maximize its effective throughput which is achievable without requiring any Primary User´s (PU´s) true state information and thus is more practical than the performance metric of ergodic capacity used by [1]. We propose an efficient algorithm to find the optimal SU rate and power allocation policy by exploiting the special structure of the problem. Based on the optimal policy, we further quantify sufficient conditions under which it is beneficial for the SU to use the PU channel even the SU sensing result indicates that the PU is busy by anticipating the happening of sensing error (but still with the PU interference constraint satisfied). Our results validate the advantages of exploiting both the information on sensing result and sensing accuracy in the overlay secondary spectrum access.
Keywords :
cognitive radio; radiofrequency interference; CR systems; PU channel; PU interference constraint; PU true-state information; SU sensing; cognitive radio systems; ergodic capacity; overlay secondary spectrum access; primary user true-state information; secondary user; sensing accuracy; sensing error; spectrum sensing-based joint rate-power allocations; transmission policy; Accuracy; Cognitive radio; Interference; Resource management; Sensors; Throughput; Wireless sensor networks; Sensing accuracy; cognitive radio systems; effective throughput; rate and power allocations;
fLanguage :
English
Journal_Title :
Wireless Communications Letters, IEEE
Publisher :
ieee
ISSN :
2162-2337
Type :
jour
DOI :
10.1109/WCL.2012.022012.120009
Filename :
6155703
Link To Document :
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