共查询到19条相似文献,搜索用时 28 毫秒
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基于解决Xmodem协议中CRC校验的目的,以经典的LFSR硬件电路为基础,采用了按字节并行运算CRC校验码,以及多字节CRC算法的方法。在Quartus II环境下,通过以VHDL语言仿真试验,得出Xmodem协议中CRC校验,以多字节循环并行CRC算法能够满足高速实时性要求的结论。 相似文献
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循环冗余校验(CRC)码是数据通信中广泛应用的一种差错检测码。在介绍CRC原理的基础上,以常见的CRC-16为例,用VerilogHDL硬件描述语言设计该算法。利用Altera公司的EDA开发工具软件QuartusII6.0,给出仿真波形图以及可以共享的模块,该模块既是CRC码生成器,又是待校验数据的校验器。仿真结果表明,这是一种实现CRC算法的有效方法,其工作频率可达到420.17MHz。 相似文献
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Unfolding算法实现的高速并行CRC电路的VLSI设计 总被引:1,自引:1,他引:0
文章通过分析Unfolding算法和被广泛应用的串行CRC校验电路,提出了一种新的高速并行CRC电路,给出了推导过程,并对它的优缺点进行了讨论。 相似文献
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高速ATM中CRC算法与信元定界的FPGA实现 总被引:1,自引:0,他引:1
在通信领域循环冗余码CRC得到了广泛的应用。为解决高速ATM中信头误码差错控制和信元定界问题,通过对循环冗余校验原理的分析,采用递推的方法得出了一种高效的CRC算法。该算法能检测到多个bit错误,并能纠正单bit的错误。相对于一般的按位串行计算或者查表并行计算的方法,这种算法运算速度快且不需要额外的空间存储余数表,提高了高速链路上数据吞吐率。数据之间逻辑关系简单,十分便于采用FPGA实现。 相似文献
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基于光纤通信网络对一种高速数据采集系统进行了设计。通过多路数据采集方式,并与光纤通信网络相结合,使得高速数据采集能力得到大幅提高。该系统主要由处理系统、采集模块及光纤网络共同构成,光纤通信网络前端采集模块在模拟滤波、采样完成后,通过处理器实现信号的传输。此外,通过光数据采集系统实验,证明了在高速数据采集系统中应用光纤通信网络能实现速率在10 Gbit·s-1以下的光数据接入采集。 相似文献
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为了实现测试光纤陀螺仪的大量的数据采集,提出了一种基于FPGA的高速大容量异步FIFO控制器的实现方法,分析了所用SDRAM的特点和工作流程,设计出了实现这种控制器的方法。最后给出了SDRAM控制器的写数据仿真结果图。此设计基本满足了测试光纤陀螺仪数据采集和数据存储的要求。设计中采用SDRAM作为FIFO缓冲器,利用FPGA实现对SDRAM的控制。这种方法通用性好且成本低,可以应用在任何一种有大容量数据缓冲要求的系统中。 相似文献
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Optical equalizers capable of combating the effects of laser chirp and fiber chromatic dispersion on high-speed long-haul fiber-optic communication links at 1.5 μm are described. They consist of both reflective and transmissive cavity structures. The equalizers are adaptive in the sense that the position of their periodic frequency responses are optimally adjusted in real time. The equalizers are evaluated by using computer simulation routines based on the rate equations for intensity-modulated lasers. It is shown that, by using equalizers of the type proposed, the receiver data eyes remain open well beyond where they would close without equalization 相似文献
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Martini P. Spaniol O. Welzel T. 《Selected Areas in Communications, IEEE Journal on》1988,6(6):987-996
A model of a multiple-token-ring backbone based on fiber-optic transmission, intended for LAN interconnection, is presented. Because it is one of the most important applications for inter-LAN communication, file transfer is selected for performance evaluation. A mixed traffic environment including interactive traffic is assumed. The suitability of multiple-token-access protocols is studied by approximate analysis and simulation, yielding results for both queue length and packet delay. Sensitivity with respect to medium length and station latency is considered. The results allow performance predictions for high-speed backbone networks 相似文献
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The need for high-speed data communications and mass storage systems for supercomputing is examined. The former could be serious bottlenecks in the not-too-distant future, because their capabilities have not kept up with those of supercomputers themselves. The potential of fiber-optic technologies for meeting data communication requirements is discussed, and research around the world is briefly cited. Trends in mass storage are briefly discussed 相似文献
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The development and validation of a fiber-optic laser-Doppler spectrometer to measure the movement of cilia in situ is described. The spectrometer was calibrated with reference to high-speed cinematography. The transfer function demonstrates an excellent correlation between these two methods in a range of frequency of ciliary beat extending from 3 to 38 Hz. Results are reported showing that this instrument can reliably and reproducibly detect and record ciliary activity inside the airways and the oviduct. The fiber-optic probe of the laser spectroscope can be easily introduced via the biopsy channel of a bronchoscope or laparoscope 相似文献
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偏振模色散(PMD)是对高速长距离光纤传输系统影响较大的一个因素,文章论述了PMD对光纤通信系统的影响,建立了光纤通信系统中PMD影响的理论模型,在分析单通道一阶补偿方法的局限性的同时,对高阶PMD及其补偿问题进行了分析与讨论,提出了二阶PMD补偿方案,并对该方案进行了研究. 相似文献