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移动ADHOC网络(MANET)不需要固定基站支持,可实现分布式的无中心管理,可临时组织,并具有高度移动性和抗毁性,为特殊环境(尤其是军用通信)提供了理想的解决方案。MANET可采用平面结构或分级结构,当网络规模较大并需要提供一定的服务质量保障时,宜采用分级网络结构。文章结合一种新的军用网络结构,针对其子网提出了基于动态源路由(DSR)协议的优化措施,以保证较高的报文传输成功率、较小的网络开销、较高的网络吞吐量和较小的端到端时延。 相似文献
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Effective capacity describes the rate upper bound of the communication system under the quality of service(QoS) limitation. While the foregoing performance analysis focuses mainly on the single input single output and multiple input single output systems, this paper considers the effective capacity of the multiple input multiple output(MIMO) beamforming scheme. Given that the modulation(M-QAM or M-PSK) is restricted, we investigate the representative transmission scheme of MIMO beamforming: maximal ratio combining transmission, for which the closed-form formula of effective capacity is derived. Simulation results not only demonstrate the effectiveness of our performance analysis, but also show the relationship between effective capacity and average signal-to-noise ratio as well as the relationship between effective capacity and QoS parameter for various antenna configurations. 相似文献
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近年来,LEO卫星以其体积小、重量轻、链路信号传播时延短、功率损耗小和便于终端小型化等优点,受到越来越广泛的重视。然而,由于LEO卫星的速度非常快,从而引入了切换问题。当用户切换到新的卫星或波束时,原先分配的信道无法再继续使用而需要系统为其重新分配一条信道,并收回原先分配信道的过程就是切换中的信道分配。 相似文献
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