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�������պ����ѧѧ�� 2004, Vol. 30 Issue (07) :618-622    DOI:
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DS/FH���ϵͳ��ַ��������
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Multi-access interference suppression in DS/FH communication system
Liu Jicheng, Shao Dingrong*
School of Electronics and Information Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100083, China

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ժҪ ����DS-CDMA(Direct Sequence Code Division Multi-Access)ϵͳ�ж��û�����˼��,�����˲��и��ŵ���PIC(Parallel Interference Cancellation)��ϵͳ���ܵ�Ӱ��,�ڴ˻�����,����˲��ò��ֲ��и��ŵ���PPIC(Partial Parallel Interference Cancellation)����������DS/FH SSMA(Direct Sequence/Frequency Hopping Spread Spectrum Multi-Access)���ϵͳ�еĶ�ַ����MAI ( Multi-Access Interferences).�Ƶ��˱ջ���ʽ�������ʹ�ʽ,�õ�ϵͳ�������������ޱ��ʽ.����������,����PPIC��������Ч�����DS/FH SSMAϵͳ�Ŀ���ַ���ŵ�����,����������ϵͳ������.�����ǽ�����AWGN�ŵ��µ�,����˥���ŵ��͵�����Ȼ�����,ϵͳ�����ܻ���һ���̶ȵĽ���.
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Abstract�� According to the thought of multi-users detection(MUD)used in direct sequence code division multi-access (DS-CDMA) system, partial parallel interference cancellation(PPIC) technology was put forward to suppress multi-access interference(MAI) in direct sequence/frequency hopping spread spectrum multi-access(DS/FH SSMA)after analyzing the effect on system performance by parallel interference cancellation(PIC). Bit error rate(BER) closed expression was deduced and up-limited expression of system performance estimation was also acquired. Simulation results demonstrate that PPIC technology can suppress MAI effectively in DS/FH SSMA, and system capacity can be improved. The simulation was accomplished under AWGN, system performance will deteriorates to some extent under fading channel and low signal noise ratio(SNR)condition.
Keywords�� spread spectrum communication   interference   multi-access interference   interference cancellation     
Received 2003-03-06;
About author: ���̳�(1970-),��,��������ˮ��,��ʿ��, ljcyjh@163.com.
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���̳�, �۶���.DS/FH���ϵͳ��ַ��������[J]  �������պ����ѧѧ��, 2004,V30(07): 618-622
Liu Jicheng, Shao Dingrong.Multi-access interference suppression in DS/FH communication system[J]  JOURNAL OF BEIJING UNIVERSITY OF AERONAUTICS AND A, 2004,V30(07): 618-622
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