摘要
为了更好的对直扩和跳频这两种方式下的CDMA自组织网络的容量进行分析和比较,本文采用了闭合平面模型对自组织网络节点情况进行建模,给出了在此模型下直扩和跳频两种方式网络容量公式并利用MonteCarlo方法进行了仿真。结果显示,链路数较大时跳频系统的容量首先随跳频点数增加而上升,在达到最大值后会持续下降并最终低于直扩系统的容量。跳频容量最大值以及达到跳频容量最大值时的跳频点数都随着链路数的增加而上升。因此跳频模式在容量上优于直扩模式是有条件的。本文的结论为跳频CDMA自组织网络系统的跳频点数选取提供了依据。
A new closed plane model was employed in this paper to analyze and compare the capacities of DS and FH CDMA Ad hoc networks. Formulas of these capacities were presented. When the number of links was large, simulation using Monte Carlo showed the capacity of FH-CDMA grew up as the number of FH frequency points ascending, But the capacity went down after it got the maximum value and became smaller than the capacity of DS-CDMA at last. The maximum values and the numbers of FH frequency points when capacity got the maximum values ascended as the number of links growing, So it is conditioned that the capacity of FH-CDMA was better than the capacity of DS-CDMA. The conclusion of this paper gave some evidences to system designers for the selection of the number of FH frequency points in FH-CDMA Ad hoc networks,
出处
《微计算机信息》
北大核心
2005年第09X期159-161,共3页
Control & Automation
基金
国家自然科学基金项目资助(90204001)
国家863高技术项目(2003AA12331002)
