Telefonaktiebolaget Lm Ericsson (publ)

Henrik Hallenberg

Esther Sienkiewicz

Adrien Comeau

Stefan Johansson

Torbjörn Elfström

Henrik Jidhage

Erik Nilsson

Dan Roos

Christian Heina

There is provided mechanisms for OTA testing of an AAS of an EUT. A method is performed by a network node. The method includes obtaining definition of a test signal to be transmitted or received by the EUT in accordance with a time/frequency resource grid. The method includes applying first beamforming weights to first selected resource elements of the time/frequency resource grid that give first beam directions according to a first type of configuration for first OTA testing of the AAS. The method includes applying second beamforming weights to second selected resource elements of the time/frequency resource grid that give second beam directions according to a second type of configuration for second OTA testing of the AAS. The method includes initiating transmission or reception of the test signal over the AAS using the time/frequency resource grid.

Over-the-air testing of an active antenna system

A method () of determining sign of a calibration compensation for use in an antenna system () is provided, the antenna system () comprising individually calibrated subarrays (). The method () comprises selecting () a set of antenna elements comprising two neighboring antenna elements of the first subarray () and two neighboring antenna elements of the second subarray (); measuring (): in a selected antenna element of the first subarray () a first received signal Yas transmitted from the other selected antenna element of the first subarray () and a second received signal Yas transmitted from the neighboring antenna element of the second subarray (), and in a selected antenna element of the second subarray () a third received signal Yas transmitted from the other selected antenna element of the second subarray () and a fourth received signal Yas transmitted from the neighboring antenna element of the first subarray (); calculating () for the first calibrated subarray () a downlink compensation value &#x394;tand an uplink compensation value Arbased on measurement values obtained from the measuring (), each compensation value At, Arhaving a positive and a negative solution; determining () a first compensation value estimate, k, for downlink compensation and a second compensation value estimate, k, for uplink compensation; and determining () the sign of the downlink compensation value Atand the uplink compensation value Arbased on distance between the first compensation value estimate kand the downlink compensation value, At, and the distance between the second compensation value estimate, k, and the uplink compensation value Ar.

Method of determining sign of a calibration compensation

Systems and methods relating to performing individual transmit and/or receive measurements for each antenna element in an antenna array implemented on an Substrate Integrated Antenna Array (SIAA) are disclosed. In some embodiments, an SIAA comprises a substrate, one or more antenna elements at a surface of the substrate, and an electrically conductive via fence having a first side electrically coupled to ground within the substrate and a second side at the surface of the substrate, the electrically conductive via fence separately circumscribing each antenna element of the one or more antenna elements within the substrate. The SIAA enables the use of a respective test structure to perform per-antenna element measurements.

Conducted OTA test fixture

Conducted ota test fixture

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Lindome, Sweden

Henrik Hallenberg