Optimal Period Interleaver for Turbo Codes
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摘要: 从码字重量分布的角度分析了影响Turbo码性能的原因,介绍了Turbo码最优周期交织器的概念,然后基于这一概念,为Turbo码提供了一个新的交织器设计方法, 并对采用这种交织器的Turbo码的性能进行仿真.与几种常用的交织器相比,这样的交织器使Turbo码的性能有了很大改善,这种改善在高信噪比的环境中更为明显.最优周期交织器的应用对于实际的Turbo码交织器设计有重要的意义,对于提高移动通信系统的性能有重要价值.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.
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Key words:
- feedback /
- convolutional codes /
- signal-noise ratio /
- Turbo codes /
- mobile communication
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[1] Berrou C, Glavieux A, Thitimajshima P. Near Shannon limit error-correcting coding and decoding:Turbo-codes . In:Proc IEEE Internatinal Conference on Communications . Geneva:IEEE, 1993. 1064~1070. [2]Dolinar S , Divsalar D. Weight distributions for Turbo codes using random and nonrandom permutations . TDA Progress Rep 42-122,1995．56~65. [3]Perez C, Seghers J. A distance spectrum interpertation of Turbo codes .IEEE Trans Inform Theory, 1996,42:1698~1709. [4]Khandani A. Design of Turbo-code interleaver using hungarian method . Electron Lett, 1998,34:63~65. [5]Dunscombe E,Piper F C. Optimal interleaving scheme for convolutional coding[J]. Electron, Lett,1989,25:1517~1518. -
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