In order to improve the performance of the security-reliability tradeoff （SRT）, a joint jammer and user scheduling （JJUS） scheme is proposed. First, a user with the maximal instantaneous channel capacity is select...
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In order to improve the performance of the security-reliability tradeoff （SRT）, a joint jammer and user scheduling （JJUS） scheme is proposed. First, a user with the maximal instantaneous channel capacity is selected to transmit its signal to the base station （ BS） in the transmission time slot. Then, when the user transmits its signal to BS, the jammer is invoked for transmitting artificial noise in order to perturb the eavesdropper’s reception. Simulation results show that increasing the number of users can enhance the SRT performance of the proposed JJUS scheme. In addition, the SRT performance of the proposed JJUS scheme is better than that of the traditional round-robin scheduling and pure user scheduling schemes. The proposed JJUS scheme can guarantee the secure transmission even in low main-to-eavesdropper ratio（ MER） regions.
针对当前基于Trie的变长层次化且可以无限长度的命名的数据网络(Named Data Networking,NDN)内容名称的最长前缀匹配查找策略存在复杂性高、查找速率低且树型数据结构的更新开销高等问题,导致算法效率低,提出一种快速的贪婪名称查找机制...
详细信息
针对当前基于Trie的变长层次化且可以无限长度的命名的数据网络(Named Data Networking,NDN)内容名称的最长前缀匹配查找策略存在复杂性高、查找速率低且树型数据结构的更新开销高等问题,导致算法效率低,提出一种快速的贪婪名称查找机制(FGNL)来实现数据包的快速转发。快速的贪婪的组件代码分配机制复杂性较低,容易实现,支持快速更新;组件编码树本质上是一个二维状态转移表,进一步转换成快速的哈希表查找;多哈希表结构创建速度快,且压缩存储空间,能够极大地加快名称查找的速度。实验结果证明,与字符查找树相比FGNL方案减少大约48.71%的内存,与NCE相比节省26.98%的存储空间,且查找速度获得了2倍的加速。评估结果也表明,该方案可以向上扩展来适应名称集潜在的未来增长。
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