Various embodiments presented herein relate to determining mutual coupling between a pair of antennas in an array antenna Various operations presented herein enable comparison between a magnitude and phase of a signal transmitted from a first feed network (via a first antenna) and a magnitude and phase of a portion of the signal received at a second feed network (via a second antenna) Electrical effects engendered by any of the first feed network, a first switch, a first local circuit, the second feed network, a second switch, and a second local circuit can also be determined and their effects mathematically removed Based upon the foregoing, a mutual coupling between the pair of antenna is determined

In-situ active impedance characterization of scanned array antennas

Embodiments provide a method for transmitting a downlink control signal, and an apparatus. The method includes: sending, by a base station, one or more radio frames, where the one or more radio frames include a plurality of OFDM symbols that carry synchronization signals, each OFDM symbol that carries a synchronization signal is sent by using one or more downlink beams of the base station, and the OFDM symbol that carries the synchronization signal further carries a downlink control signal. The downlink control signal is placed in the OFDM symbol that carries the synchronization signal.

Method for transmitting downlink control signal and apparatus

The present invention relates to a measurement of radio-frequency signals by a measurement arrangement comprising a radio-frequency lens for mapping a vertex of a reflector to a virtual vertex. Accordingly, measurement of radio-frequency signals may be performed either at the vertex of the reflector or the virtual vertex generated by means of the radio-frequency lens.

Measurement arrangement and measurement method

An example system includes a receptacle to house a device under test (DUT); an antenna for exchanging signals with the DUT, where at least some of the signals are for use in performing radiated testing of the DUT; and a cap configured to mate to the receptacle to form a housing to enclose the DUT. The housing is for isolating the DUT at least one of physically or electromagnetically.

Handler change kit for a test system

Wireless network interfaces that are capable of transmitting and/or receiving beamformed radiofrequency (RF) signals may be assisted by the use of codebooks. Electronic devices with memory to store a database of codebooks may be used to increase the number of entries available for operation. The database of codebooks may employ environmental parameters to improve efficiency of the wireless network interface. Methods for calibration of electronic devices and/or adjustment and selection of codebooks based on the parameters are also described. The calibration may employ a testing chamber that measure powers at in a limited number of angles.

Codebook updates for a linear system using superposition

A method performed by a network node for determining a beam to be transmitted to at least a first User Equipment, UE is provided The network node determines (903) a beam to be transmitted to at least a first UE based on an obtained average spatial profile of radiated power in each direction The average spatial profile of radiated power is based on an spatial profile of radiated power averaged over any one or more out of a frequency interval and a time interval

Network node and method therein for for determining a beam to be transmitted for at least a first user equipment

A method and apparatus for performing TRP measurements of an antenna system uses a sampling grid that takes into account the spherical geometry and the directivity of the antenna under test, while considering test time. The optimization of the sampling grid balances the trade-off between reducing the number of samples to reduce test time, and ensuring accuracy of the TRP estimates.

Reduced grid for measurement of total radiated power

The embodiments herein relate to a method performed by a testing device (101) for enabling testing of a communication node (103). The testing device (101) measures a test parameter associated with RF characteristics of the communication node (103) when it is located at a test location (105) during a first condition. The communication node (103) is configured with a node setting during the measurement in the first condition. The testing device (101) measures the test parameter associated with the RF characteristics of the communication node (103) when it is located at the test location (105) during a second condition. The communication node (103) is configured with the same node setting in the second condition as in the first condition. The testing device (101) checks whether a result parameter associated with the test parameter measured during the first and second condition fulfills a requirement.

Method and device for enabling testing of a communication node

The present invention relates to a communication node arrangement comprising at least two antenna units. Each antenna unit comprises at least one signal port and at least one antenna element, where each signal port is connected to at least one corresponding antenna element. Each antenna unit comprises at least one sensor unit arranged to sense its orientation relative a predetermined reference extension. The communication node arrangement comprises at least one control unit and is arranged to feed a respective test signal into each of at least two different signal ports. For each such test signal, the communication node arrangement is arranged to receive the test signal via at least one other signal port. The communication node arrangement being arranged to determine relative positions of said antenna units based on the received test signals, and to determine relative orientations of said antenna units based on data received from the sensor units.

A self-configuring communication node arrangement

The embodiments herein relate to a method performed by a communication node (103) for enabling OTA testing. The communication node (103) comprises at least one active antenna (310). The communication node (103) transmits a test signal OTA by emitting a radiation pattern from the active antenna (310). The active antenna (310) scans two or more directions when emitting the radiation pattern.

Elfström Torbjörn

Papers

Network node and method therein for for determining a beam to be transmitted for at least a first user equipment

Reduced grid for measurement of total radiated power

Method and device for enabling testing of a communication node

A self-configuring communication node arrangement

Method and node for enabling ota testing of an eut