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�������պ����ѧѧ�� 2000, Vol. 26 Issue (4) :381-384    DOI:
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Optimal Period Interleaver for Turbo Codes
QI Feng1, WANG Mu-zhong2, SHAO Ding-rong1, ZHANG Yan-zhong1*
1. Beijing University of Aeronautics and Astronautics,Dept. of Electronic Engineering;
2. Hong Kong Polytechnic University, Dept. of Electronics and Information Engineering

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Abstract�� By analyzing the relation between input sequences and feedback polynomials, we find the reason why low-weight codewords for Turbo code are generated.The concept of optimal period interleavers for Turbo codes is introduced. A novel design scheme for interleavers used for Turbo codes is presented. The main idea of this method is to design the interleaver based on an optimal period interleaver. Simulation results are presented for Turbo codes using our interleavers. A magnitude improvement in bit error rate performance is obtained at high signal-noise ratio compared to Turbo codes using other conventional interleavers. According to simulations results, it is significant to apply the optimal period interleaver in the practical interleaver design. This is particularly of interest to Turbo coding applications in mobile communications where short frames are typical.
Keywords�� feedback   convolutional codes   signal-noise ratio   Turbo codes   mobile communication     
Received 1999-01-27;
Fund:

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���, ������, �۶���, ������.Turbo���������ڽ�֯��[J]  �������պ����ѧѧ��, 2000,V26(4): 381-384
QI Feng, WANG Mu-zhong, SHAO Ding-rong, ZHANG Yan-zhong.Optimal Period Interleaver for Turbo Codes[J]  JOURNAL OF BEIJING UNIVERSITY OF AERONAUTICS AND A, 2000,V26(4): 381-384
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