一种基于微处理器的线性编码技术的研究与实现

在此推导出CRC编码算法原理及其C语言的3种实现方法,给出适应不同计算机或微控制器硬件环境的C语言程序。用C语言编写实用的CRC计算程序,并通过实验测试3种方法的效果,分析这3种线性编码与差错控制方法,其目的是提高在S3C2410AL-20微处理器系统中进行二次开发的效率,解决在选择微处理器时容量与速度之间的矛盾。实验结果证明选用C语言实现CRC编码算法可以在编码效率和内存占有率上获得较好的效果。     

单片机系统CRC算法的实现

本文介绍了CRC算法在单片机应用系统中的实现方法，通过一系列的理论推导，得到一种比较实用的8位单片机系统CRC算法，并给出了CRC码计算的汇编语言程序。     

基于虚拟仪器的逻辑式化简与实现

化简逻辑式是进行数字电路设计的必要步骤。它对电路可靠性的提高、电路结构的简化以及资金成本的节约有着非常重要的意义。文章介绍了用Multisim 10里的虚拟仪器结合代数法进行逻辑式化简的方法。结论是基于虚拟仪器的逻辑式化简方法结合代数法非常实用,过程简单,能有效的提高数字电路设计效率。     

基于FPGA的CRC编解码器实现

循环冗余校验(CRC)是一种广泛应用于通信领域以提高数据传输可靠性的差错控制方法。介绍了CRC码的原理,分析了CRC编码、解码电路设计思路。利用VHDL语言设计CRC(7,3)编解码器并通过QuartusⅡ仿真平台进行仿真验证,最后下载到FPGA芯片实现了CRC(7,3)编解码电路。仿真及实验结果表明采用此方法实现的CRC编解码器具有速度快、可靠性高及易于大规模集成的优点。     

基于FPGA超高频RFID系统并行CRC模块设计

根据CRC(循环冗余校验码)算法的原理,和ISO/IEC18000-6标准中超高频射频识别系统对校验电路的要求,分析串行CRC算法,提出了一种并行CRC算法。经Verilog-HDL语言编写该算法程序,在QuartusⅡ9.0软件上仿真。最终给出仿真结果以及并行CRC生成模块和校验模块,仿真结果证明并行CRC算法有效提高了系统中数据的处理速度。     

基于FPGA的紫外光调制技术研究

为了提高紫外光通信系统的光功率利用率和降低该系统的误码率,提出了利用PPM和CRC码对紫外光通信系统进行研究的方法。主要是研究PPM调制和CRC码编码关键技术,包括PPM实现的方式、CRC算法的硬件实现、异步时钟域数据处理等。测试结果表明,设计的系统在数据传输速率为9.6 Kb／s时,采用CRC反馈重发纠错模式,可以使误码率可以降低到10-6,实现PPM和CRC码在紫外通信系统中的应用。     

利用CRC校验提高HFC网络通信可靠性

有线电视网络分布广、环境复杂 ,通信过程中难免受到干扰 ,目前在一些厂家内部协议中的数据校验纠错方法还比较传统 ,不能有效起到抗干扰的作用。为了提高通信的可靠性 ,值得关注和广泛应用的是一种简单而重要的通信差错控制技术———CRC。介绍了循环冗余校验CRC(CyclicRedundancyCheck)的差错控制原理和程序实现 ,并提出更具有实际应用价值的快速CRC算法的程序实现。     

基于智能卡标准的循环冗余校验码的研究与实现

分析了国内外智能卡应用中CRC校验方法的异同,深入研究了智能卡标准及CRC生成多项式,并把CRC的两种计算类型融合在一起,结合智能卡标准中CRC校验的特点提出了一种新的CRC计算模块的硬件实现方法．根据此方法完成了一种CRC计算模块的硬件设计,对设计进行了RTL仿真验证,通过了FPGA验证,并实施了投片．该芯片已经通过流片测试,结果表明模块功能和性能达到设计指标,性能良好．     

EPON中CRC校验码的并行算法实现

EPON是基于以太网技术的宽带接入,采用以太网的帧结构。文章详细介绍了EPON中CRC校验的原理和算法,给出了采用并行电路实现EPON中CRC产生和CRC校验的解决方案,然后用M odelsim进行了仿真。与串行电路相比,这种并行电路提高了CRC算法的实时性能,为进一步实现高速系统创造了条件。     

航空卫星通信中的CRC的软件实现方法的研究

循环冗余校验(CRC)在航空卫星移动业务(AMSS)通信中得到广泛应用。CRC可以用硬件实现,也可以用软件实现,本文论述-AMSS通信中CRC的软件实现方法,本文提出的一种改进的CRC校验软件实现方法,具有计算量小、适用性强的优点。已用实验性AMSS通信地面地球站(GES)所接收到的数据,对所述CRC的软件实现方法的正确性进行了验证。     

运用数据选择器实现组合逻辑电路设计方法

组合逻辑电路传统设计方法是采用门电路组成设计形式,设计时所需门电路器件多,电路相对复杂,应用价值差。运用数据选择器设计组合逻辑电路方法,可以实现任何不同组合逻辑函数,从而实现组合电路设计,适应范围广,并且其设计电路简洁,接线方便,工作可靠性、稳定性高。因此利用数据选择器设计组合逻辑电路具有一定的应用价值,能解决常规门电路设计存在不足,提高电路设计水平。     

MathType在高等代数试题库实现中的应用研究

主要介绍了MathType的常用基本功能,利用OLE技术,将MathType、MSWORD及Vir-sual FoxPro的无缝集成,使用Virsual FoxPro编程,调用MSWORD及MathType,很好的解决了在高等代数试题库系统中数学公式的录入、编辑、修改、存储及再现等关键问题,给出了实现高等代数试题库系统的关键技术和方法,该技术和方法可广泛的应用到其他试题库系统中。     

A BDD-based algorithm for reliability analysis of phased-missionsystems

This paper presents a new algorithm (PMS-BDD) based on the binary decision diagram (BDD) for reliability analysis of phased-mission systems (PMS). PMS-BDD uses phase algebra to deal with the dependence across the phases, and a new BDD operation to incorporate the phase algebra. Due to the nature of the BDD, cancellation of common components among the phases can be combined with the BDD generation, without additional operations; and the sum of disjoint products (SDP) can be implicitly represented by the final BDD. Several examples and experiments show that PMS-BDD is more efficient than the algorithm based on SDP, in both computation time and storage space; this efficiency allows the study of some practical, large phased-mission systems     

Digital stochastic realization of complex analog controllers

Stochastic logic is based on digital processing of a random pulse stream, where the information is codified as the probability of a high level in a finite sequence. This binary pulse sequence can be digitally processed exploiting the similarity between Boolean algebra and statistical algebra. Given a random pulse sequence, any Boolean operation among individual pulses will correspond to an algebraic expression among the variables represented by their respective average pulse rates. Subsequently, this pulse stream can be digitally processed to perform analog operations. In this paper, we propose a stochastic approach to the digital implementation of complex controllers using programmable devices as an alternative to traditional digital signal processors. As an example, a practical realization of nonlinear dissipative controllers for a series resonant converter is presented.     

Remarks on n -D Polynomial Matrix Factorization Problems

Multidimensional (n-D) polynomial matrix factorizations are intimately linked to many problems of multidimensional systems and signal processing. This paper gives a new result for a n-D polynomial matrix to have an minor prime factorization using methods from computer algebra. This result may be regarded as a generalization of a previous criterion under a special restriction [IEEE Trans. Circuits Syst. II: Exp Briefs, vol. 52, no. 9 (2005)]. Examples are given to illustrate results using computer algebra software system Singular.     

A Clifford algebra analysis of polarization-mode dispersion and polarization-dependent loss

We present an overview of Clifford algebra and its application to polarization-mode dispersion and polarization-dependent loss. We demonstrate that the Jones matrix corresponds to a Lorentz transformation in this algebra and obtain its frequency-dependent evolution through the Magnus expansion. We also comment on the application of Clifford algebra methods to partially polarized light.     

将建模与图论思想融入《线性代数》教学的实践

《线性代数》教学改革是信息技术发展的必然,《数学建模》是数学类课程改革的典范。课题组在成功进行《数学建模》教学与组织数学建模竞赛的基础上进行《线性代数》教学改革的实践,将数学建模思想和方法融入到《线性代数》的教学,将《数学建模》教学中的教学理念、教学内容、模块化教学、案例教学等方法引入《线性代数》教学,推进《线性代数》教学改革。     

The growing algebraic presence in systems engineering: An introduction

A great deal of what systems engineers do is rooted firmly in the concepts of modern algebra. Despite this fact, however, systems manipulations have often been carried out with little or no awareness of their basic algebraic nature. However, recent years have witnessed a growing cognizance of the intrinsic presence of algebra in systems theory, and this recognition has led not just to further understanding of problems already solved but to unforeseen solutions of problems unsolved by the older, less formal methods. This paper is intended to introduce the art of recognizing the sorts of issues which may be clarified and resolved through the application of modern algebra. Among the topics discussed are modules, quotients, and tensors, together with illustrative applications.     

Geometric Algebra: A Powerful Tool for Representing Power Under Nonsinusoidal Conditions

Geometric algebra is used in this paper for a rigorous mathematical treatment of power in single-phase circuits under nonsinusoidal conditions, as complex algebra for sinusoidal conditions. This framework clearly displays the multidimensional nature of power, which is represented by a multivector. The power multivector with its three attributes (magnitude, direction and sense) provides the means to encode all the necessary information in a single entity. This property, in conjunction with the fact that there is a one-to-one correspondence between the terms of this multivector, the instantaneous and the apparent power equation, distinguishes it as a highly efficient mathematical tool. In this way one can successfully describe power phenomena and handle practical problems (e.g., power factor improvement). Two simple examples show some of these features. In short, the power multivector under nonsinusoidal situations can be perceived as the generalization of the complex power under sinusoidal situations