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通信的目的是要把信息及时可靠地传送给对方,因此要求一个通信系统传输消息必须可靠、快速。通信系统采用差错控制解决数字通信系统中的不可靠性问题,差错控制编码是数据传输过程中普遍采用的提高数据通信可靠性的方法。CRC(CyclicRedundancy Check)是一种在实际通信中应用很广泛的差错控制编码,具有很强的检错能力。介绍了循环冗余校验CRC的差错控制原理及其特点,并给出了采用C语言程序对此算法检错性能的仿真分析。 相似文献
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一种快速循环冗余校验算法的Verilog实现 总被引:1,自引:0,他引:1
介绍了CRC编码的基本原理,由此推导了串行输入(位并行)字符组合m1m2…mk-1mk的CRC码的快速计算方法,以满足通信过程中,数据流的快速CRC编码要求。该算法特别适用于大数据块的CRC编码。随后。给出了算法的Verilog硬件描述语言的可编程逻辑器件的实现方法,并在ISE中用ModelSim进行了仿真,使用Synplify Pro得到了综合结果。 相似文献
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针对CAN协议中提出的串行CRC检验原理,给出其硬件实现方法及具体实现时应需注意的技术问题,给出了RTL级的VHDL代码。为了提高CRC编码的生成速度和CRC检验的效率,介绍了CRC检验的并行原理,并针对CAN协议中CRC编码的生成多项式推导出了8位并行CRC编码的逻辑关系式。最后对串行和并行两种实现方式进行了性能对比,并给出了为满足CAN协议而进行CRC编码时应注意的问题。 相似文献
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本文给出了一种快速的CRC递推算法,并给出了计算网络协议中CRC-16码和CRC-CCITT码的程序代码。 相似文献
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为抵抗复杂传输环境对通信数据造成的影响,对循环冗余校验码CRC这一通信系统中常用的差错控制技术展开研究,设计一套算法在软硬件层面深入挖掘CRC的潜力。在简介循环冗余校验基本原理的基础上,以国际标准CRC-16为研究对象,分析编码和解码过程,在Quartus II上开发平台,运用Verilog硬件描述语言实现CRC的编码与解码。采用Modelsim软件进行仿真验证,结果表明所设计算法的正确性。算法基于可编程硬件技术实现CRC编码与解码,具有运行速度快、容易迁移的优点。 相似文献
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This article describes the rationale for the multiphase creative problem solving process, and reports the findings from an empirical investigation conducted to facilitate the problem solving of managers. The ideational skills of the managers were assessed before and after training in a complete process of creative problem solving, along with their ideational attitudes, creative problem solving style (i.e., generator, conceptualizer, optimizer, or implementor), and evaluative skill (i.e., ability to recognize original ideas). The most important findings indicated that the training had a significant impact on the evaluative accuracy of the managers. They were significantly more accurate in their judgments about original ideas after training, both in their identification of original ideas and their recognition of unoriginal ideas. After training, the managers also gave more solutions and more original solutions to problems. Finally, several variables (e.g., the “preference for active divergence” attitude, and the conceptualizer process style) seemed to moderate the impact of training. Training was therefore effective, with specific effects that can be predicted from pre-training individual differences in attitudes and process style. 相似文献
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为发现我国国家标准与国外发达国家标准法规的差距,从根本上提高我国国家标准的总体质量,提升我国产品的质量安全水平,以关键指标(因子)为核心,研究国内外标准法规比对的工作流程,利用面向对象的方法设计,实现了国内外标准法规比对分析系统。该系统适用于所有产品国内外标准法规的比对工作。 相似文献
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为提高高等院校的管理水平和决策水平,充分利用校园网资 源,开发了高等院校行政财政分析与决策系统。解决了诸如数据的动态查询、自动生成报表 、网络环境下数据共享等技术问题,具有网上数据共享、图形界面友好和安全的保密措施等 特点。 相似文献
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Mark A. Reynolds 《Nexus Network Journal》2001,3(2):147-150
Geometer Marcus the Marinite explores how the geometric and harmonic means can be employed compositionally within a frame;
how means function in the development of organizational field grids; how means work to develop linear perspective and proportional
grids. 相似文献
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Goldman DB 《IEEE transactions on pattern analysis and machine intelligence》2010,32(12):2276-2288
We discuss calibration and removal of "vignetting" (radial falloff) and exposure (gain) variations from sequences of images. Even when the response curve is known, spatially varying ambiguities prevent us from recovering the vignetting, exposure, and scene radiances uniquely. However, the vignetting and exposure variations can nonetheless be removed from the images without resolving these ambiguities or the previously known scale and gamma ambiguities. Applications include panoramic image mosaics, photometry for material reconstruction, image-based rendering, and preprocessing for correlation-based vision algorithms. 相似文献
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