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WSN中能量有效的多簇头层次型路由协议 被引量:3
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作者 吕金鹏 赵泽茂 邓淑华 《计算机应用研究》 CSCD 北大核心 2012年第5期1863-1866,共4页
为改善无线传感器网络中某些节点因能耗太大而过早失效的情况,提出了一种基于分簇的多簇头能量有效算法EHMVA(energy-efficient hierarchical multiple vice-cluster-head algorithm)。在簇头选择机制中引入邻节点距离的概念,采用多副... 为改善无线传感器网络中某些节点因能耗太大而过早失效的情况,提出了一种基于分簇的多簇头能量有效算法EHMVA(energy-efficient hierarchical multiple vice-cluster-head algorithm)。在簇头选择机制中引入邻节点距离的概念,采用多副簇头选举分担主簇头能耗的机制,通过发现联结节点和引入误差发送机制来减少数据发送,并通过延长稳定的簇通信时间来降低簇重建的频率。仿真实验表明,该算法有效地平衡了节点间的能量消耗,显著地延长了网络的存活时间。 展开更多
关键词 无线传感器网络 能量有效 副簇头 邻节点距离 联结节点 误差发送
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CLOSED-FORM ERROR RATES OF STBC SYSTEMS AND ITS PERFORMANCE ANALYSIS
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作者 Hu Xianbin Gao Yuanyuan Yi Xiaoxin 《Journal of Electronics(China)》 2006年第1期39-43,共5页
The closed-form solutions for error rates of Space-Time Block Code (STBC) Multiple Phase Shift Keying (MPSK) systems are derived in this paper. With characteristic function based method and the partial integration bas... The closed-form solutions for error rates of Space-Time Block Code (STBC) Multiple Phase Shift Keying (MPSK) systems are derived in this paper. With characteristic function based method and the partial integration based respectively, the exact expressions of error rates are obtained for (2,1) STBC with and without channel estimation error. Simulations show that the practical error rates accord with the theoretical ones, so closed-form error rates are accurate references for STBC performance evaluation. For the error of pilot assisted channel estimation, the performance of a (2,1) STBC system is deteriorated about 3dB. 展开更多
关键词 Wireless communication Space-Time Block Code(STBC) Channel estimation error Error rates calculation Transmitter diversity
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