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�������պ����ѧѧ�� 2002, Vol. 28 Issue (2) :208-212    DOI:
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A Real-Time Image Transmission Scheme for Pilotless Aircraft
LIU Rong-ke, ZHANG Xiao-lin*
Beijing University of Aeronautics and Astronautics, Dept. of Electronic Engineering

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ժҪ �������˻���ͼ��ʵʱ����ϵͳ��Ҫ��,�����һ�ײ��û�������С���任(IWT)�͸Ľ�SPIHT(Set Partitioning In Hierarchical Trees)��ͼ��ѹ�����롢������״���������Ƶ�ָ��õ���(OFDM)��ϵͳ����.��ϵͳ������Դ����ѹ���������ɵ����۽����䡢����Ч�ʸ����п��������,�ŵ�Ƶ�������ʸ��Ҳ�����Ϊ������������Ŷ�ʹ��������,ͬʱOFDM����ʹ��ϵͳ���п��ྶ�����ز���.��˸�ϵͳ�����ʺ����˻���������,��һ�ֿ��е�ϵͳ����.
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Abstract�� In the present scheme, an integer wavelet transform algorithm with modified set partitioning in hierarchical trees(SPIHT) coder was introduced to compress images. RS, symbol interleaves and trellis coded modulation(TCM) with multi-level quadrature amplitude modulation(QAM) were used to get an excellent forward error correcting ability. Orthogonal frequency division multiplexing(OFDM) scheme was adopted to improve spectrum efficiency and to decrease the average power. Bit error probability of the scheme was analyzed. The scheme was shown to possess higher compression rate, stronger progressive transmission ability, better numeration efficiency and more excellent error-resilience. Together with a performance of multi-path resilience and echo resilience, the above advantages make the proposed scheme compliant with pilotless aircraft conditions and feasible in practice.
Keywords�� pilotless aircraft   picture communication   telecommunication transmission systems   integer wavelet transformation   trellis coded modulation   orthogonal frequency division multiplexing     
Received 2000-08-21;
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���ٿ�, ������.���˻���ͼ��ʵʱ���䷽�����о�[J]  �������պ����ѧѧ��, 2002,V28(2): 208-212
LIU Rong-ke, ZHANG Xiao-lin.A Real-Time Image Transmission Scheme for Pilotless Aircraft[J]  JOURNAL OF BEIJING UNIVERSITY OF AERONAUTICS AND A, 2002,V28(2): 208-212
http://bhxb.buaa.edu.cn//CN/     ��     http://bhxb.buaa.edu.cn//CN/Y2002/V28/I2/208
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