DocumentCode :
108680
Title :
Spatial False Alarm in Cognitive Radio Network
Author :
Weijia Han ; Jiandong Li ; Zan Li ; Jiangbo Si ; Yan Zhang
Author_Institution :
State Key Lab. (ISN), Xidian Univ., Xi´an, China
Volume :
61
Issue :
6
fYear :
2013
fDate :
15-Mar-13
Firstpage :
1375
Lastpage :
1388
Abstract :
In cognitive radio, secondary user (SU) performs spectrum sensing with a certain sensing range. This sensing range has a similar definition as the carrier sensing range of IEEE 802.11 MAC. It is widely considered that a SU is permitted to utilize the primary channel if no primary user (PU) transmits data inside its sensing range. However, it is observed that a busy PU outside the sensing range still can be detected by SU. As a result, the SU misinterprets that this busy PU is inside its sensing range, and hereby loses opportunity to utilize the primary channel. This new sensing issue is termed as spatial false alarm (SFA) problem. In this paper, we show the SFA can obviously reduce the SU´s sensing performance, and cause the probabilities of false alarm and detection evaluated in current research have a great deviation with the actual results. To solve this SFA issue, the principle of SFA is studied thoroughly: i) this paper reveals the cause of this sensing problem, and presents the related approaches to ameliorate its negative impact; ii) this paper provides a reliable performance evaluation method to allow the SU to be aware of the real sensing results rather than the current works. Furthermore, with regarding the SFA, this paper derives the general upper and lower bounds of SU´s sensing performance to have an insight into various sensing applications.
Keywords :
cognitive radio; radio networks; radio spectrum management; wireless LAN; IEEE 802.11 MAC; PU; SFA; SU; certain sensing range; cognitive radio network; primary user; secondary user; spatial false alarm problem; spectrum sensing; Closed-form solutions; Cognitive radio; Detectors; Fading; Silicon; Cognitive radio; medium access opportunity; spatial false alarm; spectrum sensing;
fLanguage :
English
Journal_Title :
Signal Processing, IEEE Transactions on
Publisher :
ieee
ISSN :
1053-587X
Type :
jour
DOI :
10.1109/TSP.2012.2236833
Filename :
6397631
Link To Document :
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