三维空间域多普勒功率谱及其多天线系统性能

发布时间：2018-04-18 19:13

本文选题：波达信号 + 仰角函数　；参考：《物理学报》2014年24期

【摘要】：在三维(3 dimensional,3D)空间域信道建模中,针对波达信号仰角(elevation angle,EA)在不同覆盖区散射体环境中的分布,提出了指数型EA仰角概率密度函数并对其信道特征实现建模.在假设波达信号方位谱为均匀分布时,采用近似算法在对称和非对称两种情况下导出其多普勒功率谱密度(power spectral density,PSD)闭合表达式.从分析结果可发现PSD与仰角函数式及波达信号边界角度参数βmin和βmax关系密切,并与多普勒频移密切相关.对该三维空间域中的多输入多输出(multiple input multiple output,MIMO)多天线信号衰落相关性(spatial fading correlation,SFC)进行了推导和仿真.结果表明MIMO多天线阵元间SFC与βmin和βmax关系密切,而EA仰角概率密度函数参数n对SFC影响较小.本文引入的指数型EA仰角概率密度函数可应用于多种无线通信环境下的信道参数估计,且与传统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值,拓展了对3D空间域统计信道的建模与MIMO多天线分析计算.
[Abstract]:In 3D 3D spatial channel modeling, the exponential EA elevation probability density function is proposed and its channel characteristics are modeled for the distribution of elevation elevation EAA in different coverage area.Under the assumption that the azimuth spectrum of the DOA signal is uniformly distributed, an approximate algorithm is used to derive the closed expression of the Doppler power spectral density power spectral density (PSDs) under both symmetric and asymmetric conditions.It is found that PSD is closely related to elevation function and boundary angle parameters 尾 min and 尾 max, and is closely related to Doppler frequency shift.In this paper, the spatial fading correlation (SFCs) of multiple input multiple outputMimo signals in the three dimensional space domain is derived and simulated.The results show that there is a close relationship between SFC and 尾 min and 尾 max among MIMO multi-antenna array elements, while the parameter n of EA elevation probability density function has little effect on SFC.The exponential EA elevation probability density function introduced in this paper can be applied to the channel parameter estimation in various wireless communication environments. The comparison with the traditional model shows that the channel parameter estimation results of this model are in accordance with the theoretical and empirical values.The modeling of statistical channel in 3D spatial domain and the analysis and calculation of MIMO multi-antenna are extended.
【作者单位】：南京信息工程大学电子与信息工程学院;日本国立新泻大学工学部;
【基金】：国家自然科学基金(批准号:61372128,61471153) 江苏省科技支撑计划(工业)项目(批准号:BE2011195) 江苏省高校自然科学科学研究重大计划项目(批准号:14KJA510001) 中国博士后基金(批准号:010986678)资助的课题~~
【分类号】：TN820

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