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Α Β Γ Δ Ε Ζ Η Θ Ι Κ Λ Μ Ν Ξ Ο Π Ρ Σ Τ Υ Φ Χ Ψ Ω α β γ δ ε ζ η θ ι κ λ μ ν ξ ο π ρ σ τ υ φ χ ψ ω
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      저자 : Zhang Weidang (검색결과 3 건)
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      • Designing the Puncturing Pattern for Turbo Codes with Strong Unequal Error Protection

        Shao Xia,Zhang Weidang 보안공학연구지원센터 2016 International Journal of Multimedia and Ubiquitous Vol.11 No.10

        In multimedia transition systems, data usually is divided into levels according to their different importance. For these systems, unequal error protection (UEP) techniques are the powerful methods to guarantee lower BER for the more important classes. Puncturing patterns are very important for turbo codes to produce different code rates. Also, different puncturing patterns can give different BER distributions so that UEP can be obtained. In this paper we will study the affection of puncturing pattern to the BER distribution and present a new scheme of designing the puncturing patterns for turbo codes so that the strong unequal error protection is obtained. In this scheme the puncturing is only carried on the two parity check sequences and an idea of “gradually sparsing” is employed. Simulation results show that, compared with other puncturing schemes, this scheme can provide strong error protection for some bits without apparent degradation for other bits.

      • Improve the BER Performance of Turbo Codes with Large Size Based on BER Distributions

        Shao Xia,Zhang Weidang 보안공학연구지원센터 2015 International Journal of Future Generation Communi Vol.8 No.4

        A method for bitwise energy optimization of turbo codes with large size is developed. Unlike earlier methods, which relied on searching for minimum-weight codewords, the proposed method finds the required parameters using two bit error rate (BER) distributions obtained via simulation. Therefore, this method can be used not only for the codes with small codeword length, but also for the codes with large codeword length. Simulation results show BER improvements for turbo codes. Though the method is applied to turbo codes in this letter for concreteness, it can also be used for other kinds of error control codes because it does not rely on the code’s structure.

      • Shortening the Turbo Codes Based on Unequal Error Protection

        Shao Xia,Zhang Weidang 보안공학연구지원센터 2015 International Journal of Multimedia and Ubiquitous Vol.10 No.8

        Shortened turbo product codes (TPCs) have already been adopted in many standards, especially in multimedia field. Generally, the realizations of shortening turbo codes are based on designing specific interleavers with variable interleaving span; or using shortened–extended Hamming codes as the component to obtain different encoding block sizes. In this paper, we propose a very simple method to realize the shortening. This method is based on a parallel concatenated convolutional code (PCCC) and their inherent characteristic of unequal error protection. Sample simulation results are presented confirming the efficiency of the proposed scheme.

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