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Providing each node with one or more multi-channel radios offers a promising avenue for enhancing the network capacity by simultaneously exploiting multiple non-overlapping channels through different radio interfaces and mitigating interferences through proper channel assignment. However, it is quite challenging to effectively utilize multiple channels and/or multiple radios to maximize throughput capacity. The National Natural Science Foundation of China(NSFC) Project61128005 conducted comprehensive algorithmic-theoretic and queuing-theoretic studies of maximizing wireless networking capacity in multi-channel multi-radio(MC-MR) wireless networks under the protocol interference model and fundamentally advanced the state of the art. In addition, under the notoriously hard physical interference model, this project has taken initial algorithmic studies on maximizing the network capacity, with or without power control. We expect the new techniques and tools developed in this project will have wide applications in capacity planning, resource allocation and sharing, and protocol design for wireless networks, and will serve as the basis for future algorithm developments in wireless networks with advanced features, such as multi-input multi-output(MIMO) wireless networks.  相似文献
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企业无线网具有安装便捷、使用灵活、经济节约、易于扩展等有线网络无法比拟的优点,因此无线局域网得到越来越广泛的使用。本文首先对企业部署无线网的必要性进行简要分析,其次阐述了无线干扰的分类及其解决措施,最后根据企业实际情况实施了测试方案并最终选取解决方案。  相似文献
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多信道多接口可以明显提高Mesh网络的吞吐量,然而已有的多信道分配算法和协议基本上都没有考虑无线信道的隔离度,这样便造成了路径间干扰。提出了一种基于信道隔离度的启发式多信道分配算法(CSCA),有效地减少了路径间干扰。所构建的森林拓扑一方面方便了信道分配,另一方面也改善了流量均衡。模拟实验结果表明,CSCA算法有效地降低了Mesh网络中的干扰,提高了网络吞吐量。  相似文献
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Due to the energy and resource constraints of a wireless sensor node in a wireless sensor network (WSN), design of energy-efficient multipath routing protocols is a crucial concern for WSN applications. To provide high-quality monitoring information, many WSN applications require high-rate data transmission. Multipath routing protocols are often used to increase the network transmission rate and throughput. Although large-scale WSN can be supported by high bandwidth backbone network, the WSN remains the bottleneck due to resource constraints of wireless sensors and the effects of wireless interference. In this paper, we propose a multipath energy-efficient routing protocol for WSN that considers wireless interference. In the proposed routing protocol, nodes in the interference zone of the discovered path are marked and not allowed to take part in the subsequent routing process. In this way, the quality of wireless communication is improved because the effects of wireless interference can be reduced as much as possible. The network load is distributed on multiple paths instead of concentrating on only one path, and node energy cost is more balanced for the entire wireless network. The routing protocol is simulated in NS2 software. Simulation result shows that the proposed routing protocol achieves lower energy cost and longer network lifetime than that in the literature.  相似文献
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无线链路调度算法的性能直接受无线干扰模型准确性的影响. 尽管由于其简单性而被广泛采用, k跳干扰模型并不能准确建模真实的无线干扰特性, 从而导致链路调度算法的理论性能与实际性能之间存在很大差异. 本文考虑无线传输方向性因素对干扰的影响, 提出了Dk-hop无线干扰模型. 该模型有效排除了k跳隐藏链路, 从而更准确地对无线干扰进行了建模.理论分析表明, 当k值不超过IR+1时(IR为载波感知距离和传输距离之比), Dk-hop比k跳干扰模型更为准确, 且仍然保持了k跳干扰模型的简单性. 为与真实的无线干扰保持接近, k的合理取值范围应为[IR-2, IR+1].  相似文献
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