approximations analysis for the capacity of orthogonal space-time block codes over correlated fading channels 相关衰落下正交空时分组码容量的近似分析
The error analysis model of sampling system was set up for the first time, by combining the saddlepoint approximation analysis and numerical arithmetic, which greatly increased the potential of further application and improved the reliability of the error approximation of the optical sampling histogram 论文首次建立了采用鞍点近似法与数值算法相结合的取样系统误差分析模型,大大扩展了鞍点近似算法的适用范围,提高了误码率估算的可靠性。论文提出了基于时分取样方法的光子模数转换。
The approximation analysis result of band dipole model is obtained on the basis of the theory of mfl . the electromagnetic distribution feature of the defect in the steel panel is studied by means of simulation . the leakage magnetic distribution of the two defects and four defects plural and the defects in the column differently in the width are also assayed . conclusions that factors affecting flaw magnetic leakage to the panel also affect the column and magnetic leakage bx should be the feature of the flaw identification to several flaws are drawn 在对漏磁检测原理进行详细介绍的基础上,得出了带偶极子模型的近似解析解,并以有限元数值仿真分析为主要手段,以钢板上缺陷为对象,分析了各因素对缺陷漏磁场产生影响的不同规律,同时仿真分析了板上平行的两条裂纹,四条裂纹以及柱体上宽度不同时的裂纹的漏磁场分布特征,得出结论:影响板上缺陷漏磁场的诸因素会对柱体上缺陷漏磁场产生同样的影响;对于多条裂纹,宜用漏磁分量bx作为缺陷识别的特征量。