摘要
采用了Ｍｉｎｉｍａｘ优化方法研究卫星多波束天线的赋形问题．提出了用归一化的功率偏差值作为目标函数，并用改进后的Ｍｉｎｉｍａｘ方法建立了问题的数学模型，采用线性逼近的方法对问题进行求解，并通过偏馈抛物面多波束天线的实例，完成了对中国版图赋形波束的优化设计及相关研究，验证了上述方法的有效性，并得出有关结论．
By simulating a shared buffer ATM switch unit under burst traffic, the paper proposes that the distributions of lost cells across input ports are unlike in different modes of input cycle. On the premise that load is classified as the heavy, the moderate, and the small, the work indicates that increasing buffer size and reducing mean burst length have different effect on dropping cell loss rate at different loads. The paper also reveals that partially shared way is useful to lower cell loss rate at the moderate load and is helpful to prevent the performance degradation of a switch unit when some ports overload.
出处
《北京邮电大学学报》
EI
CAS
CSCD
北大核心
1997年第3期64-68,共5页
Journal of Beijing University of Posts and Telecommunications
基金
国家自然科学基金
