TY - JOUR
T1 - Optimal cooperative spectrum sensing with non-coherent inter-channel interference cancellation for cognitive wireless mesh networks
AU - Zhao, Bingxuan
AU - Shimamoto, Shigeru
PY - 2011/8
Y1 - 2011/8
N2 - As the precondition of dynamic spectrum access, spectrum sensing (SS) plays an important role in the spectrum utilization in cognitive wireless mesh networks (WMNs). However, the accuracy and efficiency of SS is always significantly compromised by the accompanying interchannel interference (ICI). Aiming to address this problem, this paper proposes a non-coherent ICI cancellation method in the cooperative SS. The proposed SS consists of three parts: the determination of optimal threshold, the ICI cancellation, and the algorithm of control channel allocation (ACCA). The derived optimal threshold is able to minimize the sum of the probabilities of false alarms and missed detection. The ICI cancellation is implemented indirectly by solving a nonhomogeneous linear equation set with a coefficient matrix depending only on the distances between the primary transmitters and the cognitive secondary users. The ACCA is able to utilize multiple in-band control channels rather than a single common control channel; thus, it can decrease the sensing delay. Simulations show that the proposed SS can efficiently cope with the ICI and achieve much better performance than the conventional methods in the low signal to interference-plus-noise ratio range.
AB - As the precondition of dynamic spectrum access, spectrum sensing (SS) plays an important role in the spectrum utilization in cognitive wireless mesh networks (WMNs). However, the accuracy and efficiency of SS is always significantly compromised by the accompanying interchannel interference (ICI). Aiming to address this problem, this paper proposes a non-coherent ICI cancellation method in the cooperative SS. The proposed SS consists of three parts: the determination of optimal threshold, the ICI cancellation, and the algorithm of control channel allocation (ACCA). The derived optimal threshold is able to minimize the sum of the probabilities of false alarms and missed detection. The ICI cancellation is implemented indirectly by solving a nonhomogeneous linear equation set with a coefficient matrix depending only on the distances between the primary transmitters and the cognitive secondary users. The ACCA is able to utilize multiple in-band control channels rather than a single common control channel; thus, it can decrease the sensing delay. Simulations show that the proposed SS can efficiently cope with the ICI and achieve much better performance than the conventional methods in the low signal to interference-plus-noise ratio range.
KW - Cooperative SS
KW - ICI cancellation
KW - multiple control channels
KW - optimalthreshold
UR - http://www.scopus.com/inward/record.url?scp=80052923254&partnerID=8YFLogxK
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U2 - 10.1109/TCE.2011.6018854
DO - 10.1109/TCE.2011.6018854
M3 - Article
AN - SCOPUS:80052923254
VL - 57
SP - 1049
EP - 1056
JO - IEEE Transactions on Consumer Electronics
JF - IEEE Transactions on Consumer Electronics
SN - 0098-3063
IS - 3
M1 - 6018854
ER -