论文标题
在2-D不均匀环境中，MIMO系统的电磁有效度极限
Electromagnetic Effective-Degree-of-Freedom Limit of a MIMO System in 2-D Inhomogeneous Environment
论文作者
论文摘要
与单输入单输出（SISO）无线通信系统相比，多输入 - 群 - 输出（MIMO）技术的好处源自其额外的自由度（DOF），也称为散射通道或空间电磁（EM）模式，由空间多重多重多样化。当固定传输和接收阵列的物理大小，并且有足够的天线（通常具有半波长间距）时，DOF极限仅取决于传播环境。分析方法可用于估计自由空间中的限制，并且在随机环境中采用了一些近似模型，例如Clarke的模型和射线追踪方法。但是，在某些不均匀环境中的这种DOF极限尚未通过严格的全波数方法进行很好的讨论。在这项工作中，实施了体积积分方程（VIE），以调查三个代表性的二维（2-D）不均匀环境中MIMO有效自由度（EDOF）的极限。此外，我们阐明了MIMO系统的性能与其传播环境的散射特征之间的关系。
Compared with a single-input-single-output (SISO) wireless communication system, the benefit of multiple-input-multiple-output (MIMO) technology originates from its extra degree of freedom (DOF), also referred as scattering channels or spatial electromagnetic (EM) modes, brought by spatial multiplexing. When the physical sizes of transmitting and receiving arrays are fixed, and there are sufficient antennas (typically with half-wavelength spacings), the DOF limit is only dependent on the propagating environment. Analytical methods can be used to estimate this limit in free space, and some approximate models are adopted in stochastic environments, such as Clarke's model and Ray-tracing methods. However, this DOF limit in an certain inhomogeneous environment has not been well discussed with rigorous full-wave numerical methods. In this work, volume integral equation (VIE) is implemented for investigating the limit of MIMO effective degree of freedom (EDOF) in three representative two-dimensional (2-D) inhomogeneous environments. Moreover, we clarify the relation between the performance of a MIMO system and the scattering characteristics of its propagating environment.
