[1] FURMAN W. Summary-Wideband HF channel availability working group[R/OL].[2014-02-13].http://www.hfindustry.com/meetings_presentations/presentation_materials/2015_feb_hfia/presentations/4-HFIAWidebandHF.pdf. [2] WATSON B. Wide band HF UK spectrum utilisation[R/OL].[2015-02-10].http://www.hfindustry.com/ca_meetings/presentation_materials/2015_feb_wb/2-WideBandHFSpectrumAvailability.pdf. [3] KOSKI E, FURMAN W N. Applying cognitive radio concepts to HF communications[C]//Proceedings of the IET 11th International Conference on Ionospheric Radio Systems and Techniques. New York:IET, 2009:1-6. [4] VANNINEN T, LINDEN T, RAUSTIA M, et al. Cognitive HF-new perspective to use the high frequency band[C]//Proceedings of the 9th International Conference on Cognitive Radio Oriented Wireless Networks. Piscataway, NJ:IEEE, 2014:108-113. [5] 姚富强, 刘忠英, 赵杭生.短波电磁环境问题研究——对认知无线电等通信技术再认识[J].中国电子科学研究院学报, 2015, 10(2):156-161.(YAO F Q, LIU Z Y, ZHAO H S. Study on the issues of HF electromagnetic environment[J]. Journal of China Academy of Electronics and Information Technology, 2015, 10(2):156-161.) [6] SALEEM Y, REHMANI M H. Primary radio user activity models for cognitive radio networks:a survey[J]. Journal of Network and Computer Applications, 2014, 43(1):1-16. [7] GHOSH C, CORDEIRO C, DHARMA P, et al. Markov chain existence and hidden Markov models in spectrum sensing[C]//Proceedings of 11th IEEE International Conference on Pervasive Computing and Communications. Piscataway, NJ:IEEE, 2009:1-6. [8] MELIÁN-GUTIÉRREZ L, ZAZO S, BLANCO-MURILLO J L, et al. Efficiency improvement of HF communications using cognitive radio principles[C]//Proceedings of the 12th IET International Conference on Ionospheric Radio Systems and Techniques. New York:IET, 2012:1-5. [9] MELIÁN-GUTIÉRREZ L, ZAZO S, BLANCO-MURILLO J L, et al. HF spectrum activity prediction model based on HMM for cognitive radio applications[J]. Physical Communication, 2013, 9:199-211. [10] HEYDARI R, AHMADI M, MAKKI S V, et al. Cognitive radio channel behavior prediction using the hidden Markov model[C]//Proceedings of the 20147th International Symposium on Telecommunications. Piscataway, NJ:IEEE, 2014:993-998. [11] URKOWITZ H. Energy detection of unknown deterministic signals[J]. Proceedings of the IEEE, 1967, 55(4):523-531. [12] CHOI K W, HOSSAIN E. Estimation of primary user parameters in cognitive radio systems via hidden Markov model[J]. IEEE Transactions on Signal Processing, 2013, 61(3):782-796. [13] RABINER L R. A tutorial on hidden Markov models and selected applications in speech recognition[J]. Proceedings of the IEEE, 1989, 77(2):257-286. [14] CHEN Z, GUO N, HU Z, et al. Experimental validation of channel state prediction considering delays in practical cognitive radio[J].IEEE Transactions on Vehicular Technology, 2011, 60(4):1314-1325. |