TY - GEN
T1 - Improved decision thresholds for GLRT-based spectrum sensing schemes
AU - Yang, Xi
AU - Peng, Shengliang
AU - Lei, Kejun
AU - Cao, Xiuying
PY - 2011
Y1 - 2011
N2 - Due to the difficulties in characterizing the exact statistics' distributions, the decision thresholds obtained so far for the generalized likelihood ratio test (GLRT) detectors, used for the spectrum sensing in cognitive radio (CR), are based on the assumption that the sample size is large while the sample dimension is small. No investigations appear to have been made into the accuracy of these thresholds when used for the cases with moderate and large sample dimensions. In this paper, we reformulate the distributions in the form of an asymptotic series of chi-square distributions. Utilizing the series, the improved decision thresholds are then given by using the generalized inverse expansion of Cornish-Fisher type. Both the theoretical analysis and the numerical simulation verify that the new decision thresholds are more robust to the sample dimension changes.
AB - Due to the difficulties in characterizing the exact statistics' distributions, the decision thresholds obtained so far for the generalized likelihood ratio test (GLRT) detectors, used for the spectrum sensing in cognitive radio (CR), are based on the assumption that the sample size is large while the sample dimension is small. No investigations appear to have been made into the accuracy of these thresholds when used for the cases with moderate and large sample dimensions. In this paper, we reformulate the distributions in the form of an asymptotic series of chi-square distributions. Utilizing the series, the improved decision thresholds are then given by using the generalized inverse expansion of Cornish-Fisher type. Both the theoretical analysis and the numerical simulation verify that the new decision thresholds are more robust to the sample dimension changes.
KW - Cognitive radio (CR)
KW - Decision threshold
KW - Generalized likelihood ratio test (GLRT)
KW - Spectrum sensing
UR - https://www.scopus.com/pages/publications/80054964807
U2 - 10.1109/wicom.2011.6036683
DO - 10.1109/wicom.2011.6036683
M3 - 会议稿件
AN - SCOPUS:80054964807
SN - 9781424462520
T3 - 7th International Conference on Wireless Communications, Networking and Mobile Computing, WiCOM 2011
BT - 7th International Conference on Wireless Communications, Networking and Mobile Computing, WiCOM 2011
T2 - 7th International Conference on Wireless Communications, Networking and Mobile Computing, WiCOM 2011
Y2 - 23 September 2011 through 25 September 2011
ER -