Correlation of hybrid beamforming arrays in the context of OTA testing

Hybrid beamforming antenna arrays are a prominent component in communications at mm-wave frequencies. Multiple analogue beamforming arrays will be used for spatial multiplexing of signals also in hand held devices. In this work we derive the correlation coefficient for signals received by two ideal arrays in simple power angular distribution schemes. The purpose is to develop tools for evaluating over-the-air setups for testing of hybrid beamforming devices. We show a few exemplary correlation error evaluations that compare near field multi-probe OTA setups with a perfect target channel model. Results indicate that the correlation error increases with decreasing range length and channel angular spread. Moreover, larger inter-array spacing and sub-array sizes increase the correlation error.

Authors:
Kyösti Pekka

Publication type:
A1 Journal article – refereed

Place of publication:

Keywords:
antenna arrays, near field, Spatial correlation, testing

Published:
27 February 2020

Full citation:
P. Kyösti, “Correlation of Hybrid Beamforming Arrays in the Context of OTA Testing,” in IEEE Antennas and Wireless Propagation Letters, vol. 19, no. 4, pp. 671-675, April 2020. https://doi.org/10.1109/LAWP.2020.2976515

DOI:
https://doi.org/10.1109/LAWP.2020.2976515

Read the publication here:
http://urn.fi/urn:nbn:fi-fe202003259264