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�������պ����ѧ ������Ϣ����ѧԺ, ���� 100191
Robust image communication system based on wavelet transform analog coding
Wang Zhe, Zhang Xiaolin, Chen Lei,*
School of Electronics and Information Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100191, China

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ժҪ �ڸ��ӶȺ��ӳ����޻��߿ɱ��ŵ�������,����ͨ��ϵͳ��һ�廯���,��Դ�ŵ����ϱ���(JSCC, Joint Source-Channel Coding)������Ӧ�������ڸ��ƴ�ͳ�ķ���ṹϵͳ.��Դ���������ģ���ŵ�,�����һ�ֽ����С���任�������ũӳ����Դ�ŵ����ϱ���ľ�ֹͼ��ģ����봫�䷽��;�����ڸ��Ӻ���Ŀ������ŵ��������ؽ�ͼ��ʧ�����,�������Ӧ�������Ż���������㷨.���漰��������,������Դ�ŵ��������Ż�������ģ����봫����ص�,�÷������ֳ����õı��봫������,�ұ���븴�ӶȺ��ӳ�С;ͬʱ���ŵ�ʧ������±��ֳ������Խ���/����������������߿ɱ��ŵ�������ϵͳ��³���Ժ��ŵ�����������.
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Abstract�� For the applications with complexity and delay limit or in varying channel condition, joint source-channel coding (JSCC) helps to improve the conventional tandem communication system since the integrative system design. For bandwidth and power-limited analog channel, an analog coding and transferring method of image which combines wavelet transform and Shannon mapping JSCC was proposed, and based on more rational distortion estimation in consideration of channel noise, an algorithm for jointly optimum channel bandwidth allocation was developed. Simulations and analysis show that, because of the joint source-channel optimization and the capacity of taking the advantage of analog coding and transferring, the image communication system performs well and has small coding/decoding complexity and delay, and it also exhibits the properties of gracefully degradation and improvement with channel mismatch that are helpful to improve the system robustness and bandwidth efficiency in varying channel condition.
Keywords�� image coding   image communication systems   wavelet transforms   robustness   subband coding     
Received 2007-06-05;
About author: �� ��(1980-),��,��������,��ʿ��,wangzhebuaa@163.com.
����, ������, ����.һ��³����ͼ��С���任ģ����봫�䷽��[J]  �������պ����ѧѧ��, 2008,V34(06): 703-706
Wang Zhe, Zhang Xiaolin, Chen Lei.Robust image communication system based on wavelet transform analog coding[J]  JOURNAL OF BEIJING UNIVERSITY OF AERONAUTICS AND A, 2008,V34(06): 703-706
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