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�������պ����ѧѧ�� 2006, Vol. 32 Issue (05) :540-543    DOI:
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Adaptive spectral estimation based acquisition for frequency hopping signals
Huang Dongwei, Shao Dingrong, Li Shujian*
School of Electronics and Information Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100083, China

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ժҪ �����һ�ֻ����׹��Ƶ���Ƶ(FH, Frequency Hopping)�źŵIJ��񷽷�,�������Իع�����Ӧ�׹���ģ�ͺ��㷨,ͨ�������ź�Ƶ�׹�������Ƶ�źŵ�˲ʱƵ��.��Ƶ�ʹ��ƴ���ƫ��ʱ,Ϊ�˱�������о�,ʵ���Ƚ�����,������һ���µIJ����߼�.�ڸ�˹������( AWGN, Additive-White Gaussian Noise)����������(Rayleigh)˥�价����,�Բ�ͬ������Ԫ��Ŀ����µIJ������ܰ���ƽ������ʱ��������ʽ�������ֵ����.����������:�׹����㷨�ܿ���׼ȷ�ع��Ƴ��ź�Ƶ��,ʵ����Ƶ�źŵĿ��ٲ���.
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Abstract�� A FH(frequency hopping) signal acquisition technology based on frequency estimation was introduced. An adaptive spectral-estimation model was established, and the frequency estimation was implemented by autoregressive and adaptive algorithm. However, for a fading and AWGN (additive-white Gaussian noise) channel, frequency estimation errors might occur. To achieve more accurate and robust acquisition, a new acquisition logic was developed, which would prevent the acquisition scheme from making a wrong decision and leading to the false tracking. The acquisition scheme using multiple antennas was also addressed to combat the fading effect. Numerical results for the probability of the MSB (most significant bit) error and the corresponding mean acquisition time were illustrated for the performance evaluation under unfading and Rayleigh-fading channel conditions. Simulation results indicate that the FH signal frequency can be precisely estimated, and quick acquisition for the frequency-hopping signal is implemented.
Keywords�� frequency hopping   spectral estimation   autoregressive   quick acquisition     
Received 2005-05-13;
About author: �ƶ�Ρ(1977-),��,������,��ʿ��, huang dong wei@sina.com.
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�ƶ�Ρ, �۶���, �����.��������Ӧ�׹��Ƶ���Ƶ������[J]  �������պ����ѧѧ��, 2006,V32(05): 540-543
Huang Dongwei, Shao Dingrong, Li Shujian.Adaptive spectral estimation based acquisition for frequency hopping signals[J]  JOURNAL OF BEIJING UNIVERSITY OF AERONAUTICS AND A, 2006,V32(05): 540-543
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http://bhxb.buaa.edu.cn//CN/     ��     http://bhxb.buaa.edu.cn//CN/Y2006/V32/I05/540
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