University of Oulu

W. Fan, P. Kyösti, Y. Ji, L. Hentilä, X. Chen and G. F. Pedersen, "Experimental Evaluation of User Influence on Test Zone Size in Multi-Probe Anechoic Chamber Setups," in IEEE Access, vol. 5, pp. 18545-18556, 2017. doi: 10.1109/ACCESS.2017.2748558

Experimental evaluation of user influence on test zone size in multi-probe anechoic chamber setups

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Author: Fan, Wei1; Kyösti, Pekka2,3; Ji, Yilin1;
Organizations: 1Antennas, Propagation and Millimeter-wave Systems Section, Department of Electronic Systems, Aalborg University
2Keysight Technologies Finland Oy
3Centre for Wireless Communications, University of Oulu
4School of Electronic and Information Engineering, Xi’an Jiaotong University
Format: article
Version: published version
Access: closed
Persistent link:
Language: English
Published: Institute of Electrical and Electronics Engineers, 2017


Over-the-air (OTA) radiated testing for multiple-input multiple-output (MIMO) capable mobile terminals has been actively discussed in the standardization in recent years, where multi-probe anechoic chamber (MPAC) method has been selected, together with the radiated two-stage method. The supported test zone size is a key parameter to determine for an MPAC design, and the test zone size is restricted by the number of OTA antennas. A larger test zone would necessitate more OTA antennas, each port of which is driven by an expensive channel emulator radio frequency interface. Results available in the literature are typically limited to free space scenarios, where no user effect in the vicinity of MIMO terminal is present. There is a concern whether or not the test zone size should encompass the user phantom, together with the mobile terminal in the MPAC setup. To address this issue, an extensive measurement campaign was carried out in this paper. Two realistic long term evolution mockups were designed and their performance were evaluated under standard spatial channel models with and without the presence of user phantom. The measurement results have shown that the nearby user phantom can significantly affect the MIMO performance. However, its impact on the test zone size of the MPAC system is negligible, since emulation accuracy in terms of received power, branch power ratio, antenna correlation, and measured throughput under the target and the emulated channels is not affected by the presence of user phantom. Moreover, results measured with the synthetic MPAC method generally match those obtained with the reference two-stage method. These findings are valuable inputs for the ongoing MIMO OTA harmonization work in the standardization.

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Series: IEEE access
ISSN: 2169-3536
ISSN-E: 2169-3536
ISSN-L: 2169-3536
Volume: 5
Pages: 18545 - 18556
DOI: 10.1109/ACCESS.2017.2748558
Type of Publication: A1 Journal article – refereed
Field of Science: 213 Electronic, automation and communications engineering, electronics
Funding: This work was supported by the European COST Action IRACON Short-Term-Scientific Mission. The work of W. Fan was supported in part by Danish Council for Independent Research under Grant DFF611100525 and in part by the VIRTUSUO Project through the Innovation Fund Denmark.
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