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| Direction-of-Arrival Estimation for Wideband Cyclostationary Signals Basing on Multi-Cycle Focusing |
| Liu Zhang-meng; Huang Zhi-tao; Zhou Yi-yu |
| Department of Electronic Science and Engineering, National University of Defense Technology, Changsha 410073, China |
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Abstract The information within different cyclo-frequencies about the wideband cyclostationary signals may be complementary to each other, whether and to what degree can they be exploited synthetically to improve the Direction-Of-Arrival (DOA) performance with arrays for wideband cyclostationary signals owns much significance, especially when the Signal-to-Noise Ratio (SNR) is low. This paper analyzes the spectral correlation of the array output at different cyclo-frequencies, and verifies that the errors of their estimates from finite sampling are independent to each other, which demonstrates the possibility of multi-cycle synthesization. An effective way of multi-cycle focussing is also proposed to realize the process of synthesization. Simulation results show that the proposed multi-cycle focusing method greatly improved the DOA estimation performance for wideband cyclostationary signals when the SNR is low.
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Received: 10 October 2008
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2009, Vol. 31 
