Distributed source model for short-range MIMO
Distributed source model for short-range MIMO
复制标题
短距离 MIMO 的分布式源模型
DOI：
--
复制
发表时间：
2003
期刊：
影响因子：
--
通讯作者：
M. A. Ingram
中科院分区：
文献类型：
--
作者：
Jeng;M. A. Ingram
平面波或点源假设已被广泛用于阵列信号处理、参数估计和无线信道建模以简化分析。它适用于单输入单输出（SISO）和单输入/多输出（SIMO）系统，因为信道矩阵的秩为1。然而，对于视距（line-of-sight，LOS）的短距离多输入多输出（multiple-input- multiple-output，MIMO）系统，点源假设影响了MIMO信道矩阵的秩和奇异值分布，导致信道容量被低估，尤其是当单元间距超过半波长时。短距离几何结构可以应用于许多室内无线局域网（WLAN）应用。为了避免这种低估问题，接收信号相位必须精确地取决于发射和接收天线元件之间的距离。通过这种校正，当单元间距超过半波长时，短距离LOS MIMO信道的容量稳定增长。我们推导出一个基于几何的阈值距离，低于该阈值距离的分布源模型需要在光线跟踪中进行准确的性能估计。
The plane-wave, or point-source, assumption has been used extensively in array signal processing, parameter estimation, and wireless channel modeling to simplify analysis. It is suitable for single-input-single-output (SISO) and single-input/multiple-output (SIMO) systems, because the rank of the channel matrix is one. However, for short-range multiple-input- multiple-output (MIMO) systems with line-of-sight (LOS), the point-source assumption affects the rank and singular value distribution of the MIMO channel matrix, and results in the underestimation of channel capacity, especially for element spacings exceeding a half wavelength. The short-range geometry could apply to many indoor wireless local area network (WLAN) applications. To avoid this under-estimation problem, the received signal phases must depend precisely on the distances between transmit and receive antenna elements. With this correction, the capacity of short-range LOS MIMO channels grows steadily as the element spacing exceeds half wavelength. We derive an empirically-based threshold distance below which the distributed source model is required for accurate performance estimation in ray tracing.