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芦玉书 《中国人民武装警察部队学院学报》2001,17(5):59-60
采用CDMA多址技术的宽带无线ATM通信网是第三代无线通信网的研究热点之一.以此作为研究对象,对该网络的信道复用情况进行讨论,提出直接信道复用模型下的用户使用信道分布概率的计算方法. 相似文献
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This paper mainly studied the problem of energy conserving in wireless sensor networks for target tracking in defensing combats. Firstly, the structures of wireless sensor nodes and networks were illustrated; Secondly, the analysis of existing energy consuming in the sensing layer and its calculation method were provided to build the energy conserving objective function; What's more, the other two indicators in target tracking, including target detection probability and tracking accuracy, were combined to be regarded as the constraints of the energy conserving objective function. Fourthly, the three energy conserving approaches, containing optimizing the management scheme, prolonging the time interval between two adjacent observations, and transmitting the observations selectively, were introduced; In addition, the improved lion algorithm combined with the Logistic chaos sequence was proposed to obtain sensor management schemes. Finally, simulations had been made to prove the effectiveness of the proposed methods and algorithm. 相似文献
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周晓磊 《国防科技大学学报》2014,36(3)
摘要:本文针对在初始的部署条件下不可定位的无线传感器网络,提出了一种分布式的面向定位的网络调整方法,称为LODA方法。该方法通过节点所处的路径信息判别确定该节点的调整策略,从而使得初始状况下不可定位的网络达到可定位条件。LODA方法仅需调整约11%节点就能够将稀疏的网络调整至可定位,较当前最好的网络调整方法减少了约40%。此外,本文所提出的方法采用分布式的执行策略,从而将定位所产生的通信负载和能耗均衡到网络中的多个节点,克服了先前集中式方法的可扩展性限制。大量的仿真实验结果表明,LODA方法较现有方法而言具有更高的执行效率。 相似文献
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在无线传感器网络(WSN)定位应用中,针对接收信号强度指示(RSSI)容易受到环境的影响不能实现准确测距的问题,提出了一种基于RSSI线性回归分析的定位方法。该方法通过信号衰减模型和线性回归理论相结合,修正实际环境下每个锚节点的测距模型,同时利用相关系数和剩余标准差对测距模型进行评估,制定出更加合理的定位策略。实验表明,采用修正的测距模型和新的定位策略,使得节点定位精度明显提高。 相似文献
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