排序方式: 共有9条查询结果,搜索用时 31 毫秒
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在频谱资源重复利用的背景下,干扰受限的两跳多接入信道的中断性能是亟待解决的难题之一.针对目的端干扰受限的情形,本文给出了该信道在放大转发模式下的中断概率闭式解.根据中断事件的定义将中断概率分解为两部分:一部分是中继节点发生中断的概率,另一部分是中继节点未发生中断,但中继节点到目的节点的传输发生了中断的概率.通过对第二部分中断概率进行合理的近似,推导出整个系统中断概率的闭式解,为系统的实际设计提供了理论基础.仿真结果表明,所给出的估计闭式解与蒙特卡洛仿真结果相吻合,验证了此估计解的精确性. 相似文献
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To fully exploit the performance benefits of relay station (RS),in the two-hop cellular networks covering hotspots,when the number of RSs is predetermined,both RS deployment and frequency reuse scheme ... 相似文献
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针对中继网络的两跳特性,提出一种多小区中继网络两跳速率匹配资源分配算法。首先,在第一个子时隙内各小区独立地为小区中所有用户分配子载波,并根据子载波分配结果,建立基于非合作博弈的功率分配模型;然后,由第一跳资源分配结果对第二跳速率匹配,自适应地为中继分配资源以满足边缘用户的速率需求。仿真结果表明,该算法在满足边缘用户速率需求的前提下,进一步提高了中心用户的吞吐量,同时降低了系统的发射功率,从而提升了系统性能。 相似文献
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针对无线移动自组网中的节点终端掌握拓扑变化的问题,两跳的邻接表能更好地为稳定路径提供基础的支持,为了减少因拓扑改变带来的信标交换而导致报文流量增大,充分利用网络数据广播传输的特性,提出了一种两跳邻接表建立方案,并对其在不同的状态下做了详细的分析。 相似文献
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G. Dimitriadis F-N. Pavlidou 《International Journal of Wireless Information Networks》2003,10(3):149-158
In multiple channel environments, clustering provides a convenient framework for channel access and bandwidth allocation. Many clustering schemes, however, demand that terminals may communicate directly only if they share a common clusterhead. This requirement deactivates otherwise helpful links; those between nodes that belong to different clusters (intercluster links). Links between nodes that belong to different clusters constitute a distributed gateway. In this paper, we evaluate the importance of distributed gateways for two different clustering schemes and propose a novel access scheme for clustered environments using the link-cluster architecture, called two-hop polling (2HP). Two-hop polling manages to utilize intercluster links, leading to better connectivity and throughput. 相似文献
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The relay node with linear relaying transmits the linear combination of its past received signals. The optimization of two-hop relay channel with linear relaying is discussed in this paper. The capacity for the two-hop Gaussian relay channel with linear relaying is derived, which can be formulated as an optimization problem over the relaying matrix and the covariance matrix of the signals transmitted at the source. It is proved that the solution to this optimization problem is equivalent to a “single-letter ”optimization problem. We also show that the solution to this “single-letter ”optimization problem has the same form as the expression of the rate achieved by Time-Sharing Amplify and Forward ( TSAF ). In order to solve this equivalent problem, we proposed an iterative algorithm. Simulation results show that if channel gain of one hop is relatively smaller, the achievable rate with TSAF is closer to the max-flow min-cut capacity bound, but at a lower complexity. 相似文献
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