A novel hard decision decoding scheme based on genetic algorithm and neural network

A novel hard decision decoding scheme based on a hybrid intelligent algorithm combining genetic algorithm and neural network, named as genetic neural-network decoding (GND), is proposed. GND offsets the reliability loss caused by channel transmission error and hard decision quantization by making full use of the genetic algorithm's optimization capacity and neural network's pattern classification function to optimize the hard decision outputs of received matched filter and restore a more likelihood codeword as the input of hard decision decoder. As can be seen from the theoretical analysis and computer simulation, GND scheme is close to the traditional soft decision decoding in error correction performance, while its complexity, compared with the traditional soft decision decoding, is greatly reduced because its decoding process does not need to use the channel statistical information.     

Linear Codes over \mathbb{F}_{q}[u]/(u^s) with Respect to the Rosenbloom–Tsfasman Metric

We investigate the structure of codes over rings with respect to the Rosenbloom-Tsfasman (RT) metric. We define a standard form generator matrix and show how we can determine the minimum distance of a code by taking advantage of its standard form. We define MDR (maximum distance rank) codes with respect to this metric and give the weights of the codewords of an MDR code. We explore the structure of cyclic codes over and show that all cyclic codes over rings are MDR. We propose a decoding algorithm for linear codes over these rings with respect to the RT metric. AMS Classification: 94B05, 94B60     

消除挤压机误动作的差错控制编码

运用数据传输的差错控制原理,以TON－92铝材挤压机单片机控制系统为研究对象,具体介绍了串行数据传输的误码纠正方法,给出了能检测每帧中2位以上误码且能纠正1位误码的Hamming码与奇偶校验码混合的编码与解码的工作程序。     

40 Gb/s超短光脉冲序列的四相编解码实验研究

采用3码片的超结构光纤布拉格光栅(SSFBG)作为编/解码器,该编/解码器光栅包含3段子光栅(空间码片),在相邻的空间码片的边界处存在离散的四相相移(0,π/2,π,3π/2)。利用四相编解码所具有的良好自相关和互相关特性,成功实现了单信道速率高达40 Gb/s,码片速率高达240 Gchip/s的全光编解码实验。据我们所知,这是利用光纤布拉格光栅作为编/解码器的全光码分复用(OCDM)系统所达到的最高单信道传输速率。理论计算和实验结果表明了利用超结构光纤布拉格光栅(SSFBG)实现多相高速全光编解码的可行性。这样高速的全光编解码可以应用于光码分复用系统和分组交换网络。     

An application of a qd-type discrete hungry Lotka–Volterra equation over finite fields to a decoding problem

In this paper, the decoding problem for multiple Bose–Chaudhuri–Hocquenghem (BCH)-Goppa codes over the same finite field is investigated. A new iterative decoding algorithm is proposed based on the quotient difference (qd)-type discrete hungry Lotka–Volterra equation over finite fields. Compared with certain existing algorithms, the proposed algorithm manifests its advantage in computational complexity. A few of examples are presented to demonstrate its efficiency.