An improved cyclostationary feature detection based on the selection of optimal parameter in cognitive radios
Tóm tắt
Spectrum sensing is an important part of cognitive radio systems to find spectrum hole for transmission which enables cognitive radio systems coexist with the authorized radio systems without harmful interference. In this paper, an improved cyclostationary feature detection method is proposed to reduce computational complexity without loss of good performance based on the optimal parameter selection strategy for choosing detection parameters of cyclic frequency and lag. Taking binary phase shift keying (BPSK) and quadrature phase shift keying (QPSK) signals as examples, the theoretical analyses are presented for choosing the optimal parameters. Simulation results are given to certify the correctness of the proposed parameter selection strategy and show the performance of the proposed method.
Tài liệu tham khảo
Haykin S. Cognitive radio: Brain-empowered wireless communications [J]. IEEE Journal on Selected Areas in Communications, 2005, 23(2): 201–220.
Akyildiz I F, Lee WY, Vuran M C, et al. Next generation dynamic spectrum access cognitive radio wireless networks: A survey [J]. Computer Networks, 2006, 50(13): 2127–2159.
Cabric D, Mishra S M, Brodersen R W. Implementation issues in spectrum sensing for cognitive radios [C]// Proceedings of the 38th Asiomar Conference on Signals, Systems and Computers. Monterey, Canada: IEEE, 2004: 772–776.
Urkowitz H. Energy detection of unknown deterministic signals [J]. Proceedings of the IEEE, 1967, 55(4): 523–531.
Tandra R, Sahai A. SNR walls for signal detection [J]. IEEE Journal on Selected Topics in Signal Processing, 2008, 2(1): 4–17.
Wiliam A G. Exploitation of spectral redundancy in cyclostationary signals [J]. IEEE Signal Processing Magazine, 1991, 8(2): 14–36.
Dandawate A V, Giannakis G B. Statistical tests for presence of cyclostationarity [J]. IEEE Transactions on Signal Processing, 1994, 42(9): 2355–2369.
Sutton P D, Nolan K E, Doyle L E. Cyclostationary signatures in practical cognitive radio applications [J]. IEEE Journal on Selected Areas in Communications, 2008, 26(1): 13–24.
Choi K W, Jeon W S, Jeong D G. Sequential detection of cyclostationary signal for cognitive radio systems [J]. IEEE Transactions on Wireless Communications, 2009, 8(9): 4480–4485.
Lunden J, Koivunen V, Huttunen A, et al. Collaborative cyclostationary spectrum sensing for cognitive radio systems [J]. IEEE Transactions on Signal Processing, 2009, 57(11): 4182–4195.