Monte Carlo方法在移动通信可靠性分析中的应用

文章主要探讨Monte Carlo方法在移动通信可靠性分析中的应用,并引入重要抽样技术对Monte Carlo方法进行优化。首先,文章介绍Monte Carlo方法的基本原理及其在移动通信可靠性分析中的应用。其次,引入重要抽样技术对该方法进行优化。最后,利用优化网络工程工具(Optimized Network Engineering Tools,OPNET)模拟平台构建相应的移动通信网络模型,并对比Monte Carlo方法和本文研究的优化方法在不同样本数量下的性能差异。结果表明,重要抽样技术的引入显著提高了Monte Carlo方法在移动通信可靠性分析中的准确性和效率,减少了方差,验证了该方法在移动通信可靠性分析中的有效性和实用性。

水下传感网络的低复杂度APIT算法及OPNET仿真实现

由于水声传感网络具有能量的局限性,所以低复杂度的定位算法更适用于水声传感网络。传统的APIT算法能够以较少的控制开销获得较好的定位精度,有利于水下传感网络定位的实现,但其复杂度高,冗余误差较大。以点扫描的方式取代传统网格扫描法,提出一种低复杂度的APIT算法,并在OPNET平台上搭建水声传感网络环境,阐述该算法在水下传感网络节点定位的实现过程。仿真结果表明,待定位节点与锚节点密度的增加有助于改善算法的性能,且在同等条件下本文算法比传统APIT算法定位精度更高。

基于OPNET的配用电物联网监控系统通信建模与仿真

为了有效分析基于物联网技术的配用电监控系统通信网络性能,提出了基于OPNET的配用电物联网监控系统通信模型和仿真平台的建立方法。根据物联网典型的3层结构,结合配用电系统实际架构,构建“三层两网”配用电物联网监控系统模型。在配用电物联网监控系统建模需求分析基础上,通过OPNET Modeler建立配用电物联网监控系统通信模型,构建符合实际运行特点的通信仿真平台,实现配用电物联网监控系统网络性能多场景仿真。所提出的基于OPNET的配用电物联网监控系统通信建模与仿真方法,为配用电物联网监控系统通信网络性能提供定量分析工具,对物联网技术应用与配用电运行控制领域提供有力的参考依据。

一种基于OPNET的辅助决策系统模型的研究与仿真

介绍了决策系统的概念和一个功能强大的网络建模、仿真工具OPNET,讨论并且仿真了一种基于OPNET的辅助决策系统模型。

Performance Analysis of Hybrid MAC Protocol for Cognitive Radio Networks

The rapid growth in demand for broadband wireless services coupled with the recent developmental work on wireless communications technology and the static allocation of the spectrum have led to the artificial scarcity of the radio spectrum. The traditional command and control model (Static allocation) of spectrum allocation policy allows for severe spectrum underutilization. Spectrum allocated to TV operators can potentially be shared by wireless data services, either when the primary service is switched off or by exploiting spatial reuse opportunities. This paper describes a hybrid access scheme based on CSMA/CA and TDMA MAC protocols for use in the TV bands. The approach allows secondary users (SU) to operate in the presence of the primary users (PU) and the OPNET simulation and modelling software has been used to model the performance of the scheme. An analysis of the results shows that, the proposed schemes protect the primary user from harmful Interference from the secondary user. In terms of delay, it was found that packet arrival rates, data rates and the number of secondary users have significant effects on delay.

Interference Mitigation MAC Protocol for Cognitive Radio Networks

The growing demand for wireless services coupled with the limited availability of suitable electromagnetic spectrum is increasing the need for more efficient RF spectrum utilization. Spectrum allocated to TV operators can potentially be shared by wireless data services, either when the primary service is switched off or by exploiting spatial reuse opportunities. This paper describes a dynamic spectrum access scheme for use in the TV bands which uses cognitive radio techniques to determine the spectrum availability. The approach allows secondary users (SU) to operate in the presence of the primary users (PU) and the OPNET simulation and modelling software has been used to model the performance of the scheme. An analysis of the results shows that the proposed scheme protects the primary users from harmful interference from the secondary users. In comparison with the 802.11 MAC protocol, the scheme improves spectrum utilization by about 27% while limiting the interference imposed on the primary receiver.

智能变电站过程层网络关键对象建模与仿真

为满足智能变电站过程层网络及自动化应用系统的性能分析需求,提出了基于OPNET(optimizednetwork engineering tools)的变电站过程层网络建模与仿真方法。基于变电站自动化系统应用需求,分析了实体设备、IEC 61850标准、调度策略和组网结构的建模要求,研究了变电站过程层网络关键对象的建模方法。结合220 kV典型变电站,构建了完整的变电站过程层网络性能分析模型,分析了正常运行和故障运行状态下的网络性能,为开展智能变电站过程层网络及其自动化系统的性能分析提供了研究工具。