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arXiv cs/0509008cs.ITmath.IT
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非线性二维的码间干扰信道的联合均衡与译码及其在光存储中的应用

Joint Equalization and Decoding for Nonlinear Two-Dimensional Intersymbol Interference Channels with Application to Optical Storage

N. Singla, J. A. O'Sullivan

摘要:

提出了一种针对非线性二维的【形】码间干扰信道的联合均衡和译码算法。该算法在一个代表底层系统的因子图上执行和积消息传递。二维的【形】光存储(TWODOS)技术是具有非线性二维的【形】码间干涉的系统的示例。对TWODOS的非线性信道模型的仿真表明,与未编码的性能相比,TWODOS的性能有显著的改善。噪声容限阈值的算法的TWODOS信道,使用密度演化计算,也提出和准确预测的码字长度增加的算法的限制性能。

英文摘要:

An algorithm that performs joint equalization and decoding for nonlinear two-dimensional intersymbol interference channels is presented. The algorithm performs sum-product message-passing on a factor graph that represents the underlying system. The two-dimensional optical storage (TWODOS) technology is an example of a system with nonlinear two-dimensional intersymbol interference. Simulations for the nonlinear channel model of TWODOS show significant improvement in performance over uncoded performance. Noise tolerance thresholds for the algorithm for the TWODOS channel, computed using density evolution, are also presented and accurately predict the limiting performance of the algorithm as the codeword length increases.

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