CAJ | 학술논문

针对在非均匀散射体分布下信号到达角度、到达时间以及多普勒效应等信道参数估计的复杂性，提出一种合理的空间信道模型，并引入几何分割法导出基于散射体Inverted-Parabolic分布的空间统计信道模型。模型能方便地估计室外宏小区和微小区移动通信环境下各种重要的空时信道参数，如AOA、TOA概率分布密度函数和多普勒功率谱以及信号的空-时相关性。数值结果与均匀散射体圆模型和高斯散射体圆模型对比表明本模型的信道参数估计结果符合理论和经验，且与实测结果吻合较好。在基站设计采用指向性天线时研究了移动台MS的多普勒效应，修正了Clarke U-shaped经典模型，阐明了天线主瓣宽度2α、空间模型参数D/R和MS移动参数影响信道参数的机理。
침대재비균균산사체분포하신호도체각도、도체시간이급다보륵효응등신도삼수고계적복잡성，제출일충합리적공간신도모형，병인입궤하분할법도출기우산사체Inverted-Parabolic분포적공간통계신도모형。모형능방편지고계실외굉소구화미소구이동통신배경하각충중요적공시신도삼수，여AOA、TOA개솔분포밀도함수화다보륵공솔보이급신호적공-시상관성。수치결과여균균산사체원모형화고사산사체원모형대비표명본모형적신도삼수고계결과부합이론화경험，차여실측결과문합교호。재기참설계채용지향성천선시연구료이동태MS적다보륵효응，수정료Clarke U-shaped경전모형，천명료천선주판관도2α、공간모형삼수D/R화MS이동삼수영향신도삼수적궤리。
Due to the complexity of calculation for the parameters of angle of arrival(AOA), time of arrival(TOA) and Doppler spectra(DS),etc., a proper geometrical statistical channel model was proposed with inverted-parabolic spatial distribution around mobile station(MS) by using geometric partitioning method. Closed-form expressions for probability density functions(PDF) of AOA ,TOA and DS in the outdoor macrocell and microcell wireless environments were derived. Compared with the uniform and Gaussian scatter density model, the observed results consist with previous theory and experience. In addition, the Doppler spectra at the MS was also presented and the Clarke U-shaped model was modified. Employing the channel model, the effect of directional antenna was analyzed with the main-lobe width 2αat the BS and D/R and . vφ.