利用CWDM实现多路信号传输的光纤通信系统

介绍了一种利用CwDM（粗波分复用）实现包括视频信号、网络信号和多路数据信号传输的光纤通信系统，其中较详细地介绍了多路数据信号传输的设计及实现方法，包括其编／解码原理和利用CPLD来实现同步码的生成与提取过程．此系统已经应用于科研项目中，而且较好地实现了多路信号的传输，工作状态一直很稳定．     

大整数因子分解新算法及对RSA密码制的解密

对一大类大整数的因子分解构造算法WZH,可在O(L(lnm)2)+O(lnm)3(L相似文献   

On the complexity of suboptimal decoding for list and decision feedback schemes

We consider bounded distance list decoding, such that the decoder calculates the list of all codewords within a sphere around the received vector. We analyze the performance and the complexity of this suboptimum list decoding scheme for the binary symmetric channel. The reliability function of the list decoding scheme is equivalent to the sphere-packing bound, where the decoding complexity is asymptotically bounded by 2^nR(1-R). Furthermore, we investigate a decision feedback strategy that is based on bounded distance list decoding. Here, any output with zero or many codewords will call for a repeated transmission. In this case the decoding complexity will be of the order 2^nR(1-C), where C denotes the channel capacity. The reliability function is close to Forney's feedback exponent.     

交织扩展Golay码编译码器实现方案的研究

论述了交织编码的工作原理，给出了一种交织扩展Ｇｏｌａｙ码的改进型软件设计方案，用ＴＭＳ３２０Ｃ２５实现了其编译码器并给出了模拟实验结果。实验结果表明，它能准确地纠正不大于７２比特位的差错；处理１２８×１２８×８比特位的一幅图像数据的运行时间为０．４１２ｓ．     

Syndrome series of one point algebraic-geometric codes and majority voting scheme

A type of recurring relations on syndrome series is presnted. After some important theorems are established, an algorithm for computing a minimal polynomial set is presented. Finally an algorithm for determining the unknown syndromes with incorporating α majority scheme is presented.     

构造 TCM 好码的动态规划算法

提出了一种构造ＴＣＭ好码的动态规划算法（ＤＰ）．ＤＰ算法在建立了ＴＣＭ好码规则、编码器及信号网格图间的对应关系的基础上,采用动态规划算法进行寻优,从而获得ＴＣＭ好码．与常规ＴＣＭ好码构造算法［４,５］相比,本算法在精度、计算复杂度和灵活性上均有所改进．     

HDTV中的RS纠错译码设计

在HDTV系统中，RS编译码及算法是非常重要的，本文对目前的编码方案给出了简介，并提出了具有普适作用的译码设计方案。     

DSP Builder实现MP3音频解码中的IMDCT

文章主要讨论如何使用 DSP Builder来实现 MP3音频解码中的 IMDCT。MDCT和 IMDCT是 2种重叠正交变换 ,也是 MPEG音频标准中运算量最大的 2种运算 ,主要应用在数字信号处理当中。采用正弦递归循环公式 ,实现 IMDCT的内核 ,得到一种该变换的高效实现方法 ,这种方法特别适合 VLSI的并行实现     

Design and Implementation of a Novel Algorithm for Iterative Decoding of Product Codes

A novel product code iterative decoding algorithm and its high speed implementation scheme are proposed in this paper.Based on partial combination of selected columns of check matrix,the reduced-complexity syndrome decoding method is proposed to decode sub-codes of product code and deliver soft output information.So iterative decoding of product codes is possible.The fast sorting algorithm and a look-up method are proposed for high speed implementation of this algo-rithm.Compared to the conventional weighing iterative algorithm,the proposed algorithm has lower complexity while offering better performance,which is demonstrated by simulations and implementation analysis.The implementation scheme and verilog HDL simulation show that it is feasible to achieve high speed decoding with the proposed algorithm.     

基于PSTN的视频传输技术研究

简单介绍了基于不同传输网络的视频编码系列及其符合ITU—TH．324协议在PSTN网上的实现比较。在PSTN网络上，提出一种中心基于PC，远端基于改进的H．263编码，采用通用数字信号处理DSP芯片的远程视频监控系统方案。