排序方式: 共有11条查询结果,搜索用时 191 毫秒
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通过业务自适应组播路由和组播路由树的重构的方法来分析IPv6报文的QoS组播路由算法,分析了一种基于IPv6的QoS(quality of service)控制组播路由机制。仿真试验表明,该种路由算法是可行的,能够满足IPv6网络对相应QoS的要求,并具有很强的接收性能,在时间上也有较强的符合性。 相似文献
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针对电励磁同步电机(EESM)的转子位置角辨识问题,提出了一种非线性的自适应内联观测器转子位置辨识方法。首先建立电励磁同步电机的扩展模型,然后对其进行分离设计,得到两个相互关联的子系统,并分别设计了两个子系统的反馈增益,构成自适应内联观测器,最后运用李雅普诺夫稳定性定理证明了所提方法的稳定性。该方法能够根据测量的电压和电流信号,辨识得到电机的速度、位置角以及q轴电感等信息;并将辨识信息反馈回控制回路以进一步优化电机的控制性能。仿真结果表明,该方法能够在电动和发电状态下实现宽转速范围内稳定运行,而且q轴电感的辨识值能够快速准确地跟随真实值,实验结果进一步验证了所提方法的有效性。 相似文献
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多载波通信系统仿真中的EESM和MI-ESM方法 总被引:2,自引:0,他引:2
介绍了在OFDM系统仿真中链路级仿真和系统级仿真之间的映射方法,主要探讨了两种基于有效SINR映射的方法:指数有效SINR映射(EESM)和互信息有效SINR映射(MI—ESM)。着重阐述了这两种方法如何把多状态信道变成单状态信道以及为什么这种有效单SINR方法能够表示多个子载波SINR信道性能,同时也重点研究这两种方法的主要优缺点以及它们对RRM算法设计的影响。而且,也提及了如何去构建链路和系统级映射表(MCS,SINR,BLER)。 相似文献
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混合励磁同步电机及其控制技术综述和新进展 总被引:3,自引:0,他引:3
混合励磁同步电机(hybrid excited synchronous machine,HESM)是一种宽调速电机,它结合了永磁同步电机和电励磁同步电机的优点,又克服了它们各自的缺点。因此,它在宽速度运行范围的风力发电系统和电驱动系统具有广阔的应用前景。该文主要论述了混合励磁同步电机的基本特点,分析了几种典型的混合励磁同步电机的结构及工作原理,提出了一种新的混合励磁同步电机拓扑结构。在此基础上,推导了混合励磁同步电机的数学模型。基于分区控制策略,在低速区和高速区,分别研究了几种混合励磁同步电机控制技术,并对这些技术做了详细比较。针对目前混合励磁同步电机控制技术存在的不足之处,提出了一种新的效率最优控制策略。最后,给出了混合励磁同步电机及控制技术的发展趋势,展望了它的应用前景。 相似文献
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Alberto Carreras Mesa Mari Carmen Aguayo‐Torres Francisco J. Martin‐Vega Gerardo Gómez Francisco Blanquez‐Casado Isabel M. Delgado‐Luque Jose Entrambasaguas 《International Journal of Communication Systems》2018,31(1)
Evaluation of complex wireless systems through simulations is commonly tackled with an abstraction of physical link behavior. This procedure is performed in 2 phases: Firstly, training is performed at the link level, resulting in a mapping function from signal‐to‐interference‐plus‐noise ratio (SINR) to block error rate (BLER); and secondly, physical layer signal processing is replaced by the resulting link‐level mapping function. Several methods have been proposed in the literature for link abstraction. The well‐known exponential effective SINR mapping (EESM) is likely to be the most extensively used procedure for multicarrier transmission. In short, EESM estimates an effective SINR from the whole set of SINRs of useful subcarriers by means of a single parameter mapping function, which must be previously optimized through training. Later on, BLER is assumed as that of the effective SINR over an additive white Gaussian noise channel. In this paper, we propose a novel method for BLER prediction named as logistic regression‐based link method (LRLM). Mean and standard deviation of the SINR set can accurately capture BLER behavior for wideband multicarrier systems through a simpler function, thus reducing the amount of information to be stored compared to EESM. Moreover, LRLM is very flexible and may include extra predictors to reduce the number of different models to be stored. Performance results show that LRLM is able to predict accurately the BLER for all modulation and coding schemes and transport block sizes defined for Long‐Term Evolution technology. 相似文献