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�������պ����ѧѧ�� 2008, Vol. 34 Issue (03) :262-266    DOI:
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FFT-based acquisition method to eliminate influence caused by data modulation
Sun Guoliang, Li Yuqi, Zhang Xiaolin*
School of Electronics and Information Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100083, China

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ժҪ �����ÿ��ٸ���Ҷ�任(FFT, Fast Fourier Transform)������Ƶ�źŵĹ�����,Ϊ����߲��񾫶�,�������������ݵ���Ӱ�첶�����ܵ�����.��Ҫ�����˻������ݷ�������Ӱ��FFT�������ܵ�ԭ��:��Ƶ������ɴ�����źŵķ���˥���Լ�Ƶ��ƫ��.�����һ�ֽ��������ķ���:ͨ���Ԫ�I��Q����·�źŵ�����,����һ���������ݵ���Ӱ��ĸ��ź�,�Դ��ź���FFT,��ɲ���.�����˴˷�����MATLAB����,�Լ������ֳ��ɱ��������(FPGA, Field Programmable Gate Array)��ʵ�ַ���.ʵ�����ݱ���,�˷��������˻������ݵ��ƶ�FFT�������ܵ�Ӱ��,������Ȼ���ʱ���������,�ȳ��÷����IJ��񾫶������һ��.
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Abstract�� To achieve higher acquisition accuracy while using FFT(fast Fourier transform)-based algorithm to acquire spread spectrum signal, integration across data bit transition boundaries is necessary. However, performance degradation due to data modulation must be eliminated. Two effects of baseband data shift on acquisition performance, amplitude attenuation and frequency offset of the detected signal in frequency domain, were analyzed. A method to solve this problem was given. This algorithm constructs a complex signal which is free from data modulation, and detects Doppler shift using this signal through FFT. Simulation in MATLAB and FPGA(field programmable gate array)-based implementation of this method was also described. The simulation and experiment results verify that, this method can overcome the problem caused by baseband data shift, and improve acquisition accuracy by one times compared with conventional method in the same predetection integration time.
Keywords�� spread spectrum communication   signal acquisition   fast Fourier transform   acquisition accuracy   data modulation   field programmable gate array     
Received 2007-06-29;
About author: �����(1976-), ��, ɽ��Ϋ����, ��ʦ, mrsgl@buaa.edu.cn.
�����,������,������.�������ݵ���Ӱ���FFT���񷽷�[J]  �������պ����ѧѧ��, 2008,V34(03): 262-266
Sun Guoliang, Li Yuqi, Zhang Xiaolin.FFT-based acquisition method to eliminate influence caused by data modulation[J]  JOURNAL OF BEIJING UNIVERSITY OF AERONAUTICS AND A, 2008,V34(03): 262-266
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