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�������պ����ѧѧ�� 2008, Vol. 34 Issue (03) :280-284    DOI:
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Diversity detection algorithms in laser communications
Zheng Zheng, Li Ning*
School of Electronics and Information Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100083, China

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ժҪ �ڴ���������ģ����,Ӧ��Monte Carlo����,ͨ���������Ϲ��źŵĶ����������ϸ��ʷֲ�������,����ģ������˷ּ����ջ�������������Ȼ����㷨����Ȼ��.�о��˼���Monte Carlo�����з����ĸ���������������Ȼ���ķּ����ջ�������ܹ��Ƶ�Ӱ��.������һ�ֻ���ѵ�����еķּ���ⷽ��.�÷�����δ֪˥��ֲ������Ϣ�������,����ÿ֡�������һ�����ȵ�ѵ�������ṩ��ijһ�϶�ʱ�����ڵĴ��������ŵ�����Ϣ,��������Ȼ�ȱ��ʽ�ṹ���Ƶ��㷨��ø��Ƶļ��Ч��.�����������ڸ����ּ����ջ�֮����ڽ�ǿ����Ե������,���㷨�Կ�ʵ����Ч�ļ��.
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Abstract�� The likelihood ratio function in symbol-by-symbol maximum likelihood detection was calculated with the Monte Carlo method for the atmosphere laser communication systems under the weak turbulence condition. Discrete points were mass-generated according to the marginal distribution for the turbulence-induced fading. Then the accuracy of estimating the diversity performance with a relatively less number of discrete points was discussed. A practical diversity detection algorithm was presented based on an algorithm similar to the likelihood ratio function-s structure and the training sequence. This algorithm was designed to operate without any knowledge of turbulence-induced fading channel in advance. The training sequence introduced in each frame can provide the atmosphere turbulence-fading channel information for the following information sequence-s detection. Simulations were taken, and the results show the validity of this newly introduced algorithm even when strong correlation exists.
Keywords�� turbulence   optical communication   diversity reception     
Received 2007-06-29;
Fund:

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About author: ֣ �(1972-),��,������,����,Zhengzheng@buaa.edu.cn.
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֣�,����.����ͨ���еķּ���⼼��[J]  �������պ����ѧѧ��, 2008,V34(03): 280-284
Zheng Zheng, Li Ning.Diversity detection algorithms in laser communications[J]  JOURNAL OF BEIJING UNIVERSITY OF AERONAUTICS AND A, 2008,V34(03): 280-284
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http://bhxb.buaa.edu.cn//CN/     ��     http://bhxb.buaa.edu.cn//CN/Y2008/V34/I03/280
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