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OTA Testing in Multipath of Antennas and Wireless Devices With MIMO and OFDM

机译：使用MIMO和OFDM的天线和无线设备多径中的OTA测试

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摘要

New over-the-air (OTA) measurement technology is wanted for quantitative testing of modern wireless devices for use in multipath. We show that the reverberation chamber emulates a rich isotropic multipath (RIMP), making it an extreme reference environment for testing of wireless devices. This thereby complements testing in anechoic chambers representing the opposite extreme reference environment: pure line-of-sight (LOS). Antenna diversity gain was defined for RIMP environments based on improved fading performance. This paper finds this RIMP-diversity gain also valid as a metric of the cumulative improvement of the 1% worst users randomly distributed in the RIMP environment. The paper argues that LOS in modern wireless systems is random due to randomness of the orientations of the users and their devices. This leads to the definition of cumulative LOS-diversity gain of the 1% worst users in random LOS. This is generally not equal to the RIMP-diversity gain. The paper overviews the research on reverberation chambers for testing of wireless devices in RIMP environments. Finally, it presents a simple theory that can accurately model measured throughput for a long-term evolution (LTE) system with orthogonal frequency-division multiplexing (OFDM) and multiple-input–multiple-output (MIMO), the effects of which can clearly be seen and depend on the controllable time delay spread in the chamber.
机译：需要新的空中（OTA）测量技术来定量测试用于多路径的现代无线设备。我们表明，混响室模拟了丰富的各向同性多径（RIMP），使其成为无线设备测试的极端参考环境。因此，这可以补充在代表相反极端参考环境：纯视线（LOS）的消声室内进行的测试。基于改善的衰落性能，为RIMP环境定义了天线分集增益。本文发现，该RIMP多样性增益也可以作为RIMP环境中随机分布的1％最差用户的累积改善的指标。本文认为，由于用户及其设备方向的随机性，现代无线系统中的LOS是随机的。这导致定义了随机LOS中1％最差用户的累积LOS分集增益。这通常不等于RIMP分集增益。本文概述了在RIMP环境中用于测试无线设备的混响室的研究。最后，它提出了一种简单的理论，可以为带有正交频分复用（OFDM）和多输入多输出（MIMO）的长期演进（LTE）系统的吞吐量进行准确建模，其效果可以明显可以看到并取决于在室内扩散的可控时间延迟。

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