共查询到20条相似文献,搜索用时 519 毫秒
1.
2.
3.
查询式完全服务排队模型分析 总被引:35,自引:1,他引:34
本文对查询式完全服务队系统,采用嵌入马乐可夫链理论和概率母了函数的分析方法进行了研究,给出了报文的平均延迟计算公式和有关的参数值。最后通过计算机模拟实验,给出了查询式完全服务排队系统的模拟数值的结果。理论计算与模拟结果相一致。 相似文献
4.
目前互连线的工艺变化问题已成为影响超大规模集成电路性能的重要因素.考虑了互连线工艺变化的空间相关性,将工艺参数变化建模为具有自相关性的随机过程,采用数值仿真及拟合方法得到寄生参数的近似表达式,最后基于Elmore延迟度量分析了随机工艺变化对互连延迟的影响,提出了工艺变化下互连延迟统计特性的估算方法,并通过仿真实验对方法的有效性进行了验证. 相似文献
5.
选用数学模型模拟了激光大气通信系统中大气湍流信道的群延迟特性,并进行了数值计算,结果表明:大气湍流信道带来的群延迟失真很小,在激光大气通信中可以不予考虑。 相似文献
6.
7.
8.
9.
10.
11.
Jian Tong J.K. Wade D.L. MacFarlane Hanxing Shi S. McWilliams G.A. Evans M.P. Christensen 《Photonics Technology Letters, IEEE》2006,18(16):1720-1722
A photonic true time delay cell with two waveguide couplers and five semiconductor optical amplifiers is demonstrated. The five semiconductor optical amplifiers provide gain in the 1550-nm region and port selection to determine the time delay. With the amplifiers off the signal are blocked with extinction ratios of more than 10 dB. In the experiments reported here, the delay of 20 ns was provided by an optical fiber. Because of the potential for nanosecond switching times, the device has application in very agile phased array antenna applications, in optical switching and routing, and in optical filtering. 相似文献
12.
An 'almost-all' optical packet switch architecture is presented, based on two rearrangeably nonblocking stages interconnected by optical delay lines with different amounts of delay. Probability of loss as a function of link use and the size of the switch is investigated. In general, with proper setting of the number of delay lines, the switch can achieve arbitrarily low probability of loss.<> 相似文献
13.
由于孔径效应和孔径渡越时间的限制,传统的相控阵雷达难以在大扫描角下实现大瞬时带宽,有机聚合物光波导延迟线可解决这一问题。先介绍了有机聚合物光波导延迟线的原理和优点,接着综述了三种延迟线:利用聚酰亚胺制成的4位有机聚合物光波导延迟线,多层结构的有机聚合物光波导延迟线,开关选择的超长有机聚合物光波导延迟线。 相似文献
14.
为了提高一种3bit可变光纤延迟线的延时精度,提出一种采用可调谐激光器作为系统光源的技术,利用光纤的材料色散特性即光纤的折射率随传输波长变化而改变的特点,来改变延时光纤中信号存储的时间,从而达到提高光纤延迟线延时精度的目的。仿真结果表明,采用该种技术的光纤延迟线系统,平均延时误差从4.1ps下降到了1.3ps,延时精度得到了显著提高。 相似文献
15.
16.
17.
M.H. Eiselt C.B. Clausen R.W. Tkach 《Photonics Technology Letters, IEEE》2003,15(8):1076-1078
A variety of components in optical communication systems exhibit group delay fluctuations, which degrade the quality of transmitted signals. In this letter, we present a method to derive two independent figures-of-merit, based on the measured group delay, which accurately determine the system performance degradation caused by any type of group delay fluctuations in a component. These two parameters can be used to estimate the performance of concatenated components and are, therefore, suited for component specifications. 相似文献
18.
郭葆玲 《光纤与电缆及其应用技术》2007,(5):34-37
着重介绍了利用光纤的延迟特性实现光控相控阵雷达的实时延迟技术.设计了两种延迟阵列,并分别进行了试验验证,试验结果表明这两种延迟阵列各有利弊.综合考虑,方案2优于方案1. 相似文献
19.
In all-optical packet switching, packets may arrive at an optical switch in an uncoordinated fashion. To prevent packet loss in the switch, fiber delay lines (FDLs) are used as optical buffers to store optical packets. However, assigning FDLs to the arrival packets to achieve high throughput, low delay, and low loss rate is not a trivial task. In the authors' companion paper, several efficient scheduling algorithms were proposed for single-stage shared-FDL optical packet switches (OPSs). To further enhance the switch's scalability, this work was extended to a multistage case. In this paper, two scheduling algorithms are proposed: 1) sequential FDL assignment and 2) multicell FDL assignment algorithms for a three-stage optical Clos-Network switch (OCNS). The paper shows by simulation that a three-stage OCNS with these FDL assignment algorithms can achieve satisfactory performance. 相似文献
20.
提出一种新型的基于宽谱光源和色散器件结合的光控波束形成网络(OCBFN)方案,与利用独立激光器的方案进行了比较,给出了该方案的工作原理和延时链路理论分析,并通过实验验证了该方案实现光控延时的可行性。实验中利用掺铒光纤放大器(EDFA)作为宽谱光源,10 km单模光纤(SMF)作为色散器件实现光路延时,可调谐光滤波器选择光路的工作波长,利用矢量网络分析仪产生微波信号并测量信号延时特性,在9.25~10.25 GHz微波频段中,实验测得的系统延时范围、延时精度及真延时特性(延时大小与微波信号频率无关)验证了基于宽谱光源的可调谐光控微波延时方案的可行性。 相似文献