Abstract: A measuring device for testing channel state information, CSI, type II codebook compliance of a 5G NR compliant device under test is provided. The measuring device is configured to establish a communication connection to the device under test, and send a codebook subset restriction command to a device under test. The codebook subset restriction command instructs the device under test to exclude all CSI type I precoders.

Abstract: A method and a test device for testing the CSI Type 2 channel estimation capability of a DUT are provided. The method includes: a) stimulating certain variance of PMI feedback values from the DUT, especially those belonging to the finer grained Type 2 CSI, b) a statistical collection of one or more PMI reports received through CSI reporting from the DUT during the test execution, c) an identification of Type 1/Type 2 PMI feedback type based on the CSI reports received from the DUT, and d) applying a pass criterion: a minimum threshold of Type 2 specific feedback reports must have been received.

Abstract: A method of channel estimation in a communication system includes the steps of: receiving at least one input signal associated with at least one data stream, the input signal having reference symbols and data symbols; processing the at least one input signal in a slot-wise manner; performing a channel estimation by taking at least one reference symbol per input signal into account, which is used to equalize the respective input signal and to assign the symbols to the at least one data stream, thereby generating a processed signal for each independent data stream, and processing further the processed signal while performing an additional channel estimation for each independent data stream, wherein the reference symbols and the data symbols are taken into account for the additional channel estimation. Further, a signal processing system is described.

Abstract: A method and a test device for testing the CSI Type 2 channel estimation capability of a DUT are provided. The method comprises: a) stimulating certain variance of PMI feedback values from the DUT, especially those belonging to the finer grained Type 2 CSI, b) a statistical collection of one or more PMI reports received through CSI reporting from the DUT during the test execution, c) an identification of Type 1/Type 2 PMI feedback type based on the CSI reports received from the DUT, and d) applying a pass criterion: a minimum threshold of Type 2 specific feedback reports must have-been received.

Abstract: A measuring device for testing channel state information, CSI, type II codebook compliance of a 5G NR compliant device under test is provided. The measuring device is configured to establish a communication connection to the device under test, and send a codebook subset restriction command to a device under test. The codebook subset restriction command instructs the device under test to exclude all CSI type I precoders.

Abstract: A test equipment is provided for over the air tests on a device under test, in particular a user equipment, having a shielded space, at least one signal antenna for transmitting and receiving cellular signals arranged in the shielded space, and a plurality of noise antennas arranged in the shielded space linked in an array configured to create Additive White Gaussian Noise. The noise antennas are equally distributed in three dimensions within the shielded space. Further, a method for testing a device under test is shown.

Abstract: An error rate test method is disclosed. The error rate test method comprises the following steps. At least one test signal with a predetermined frequency is received from at least one device under test. A symbol sequence comprised in the at least one test signal is determined. At least one error quantity being associated with the at least one device under test and the at least one test signal is determined based on the determined symbol sequence, wherein the at least one error quantity determined is indicative of a rate of erroneous symbols comprised in the symbol sequence. Respective error quantities are determined simultaneously for at least one of multiple devices under test and for multiple different predetermined frequencies. Further, a test system for testing a device under test is disclosed.

Abstract: An error rate test method is disclosed. The error rate test method comprises the following steps. At least one test signal with a predetermined frequency is received from at least one device under test. A symbol sequence comprised in the at least one test signal is determined. At least one error quantity being associated with the at least one device under test and the at least one test signal is determined based on the determined symbol sequence, wherein the at least one error quantity determined is indicative of a rate of erroneous symbols comprised in the symbol sequence. Respective error quantities are determined simultaneously for at least one of multiple devices under test and for multiple different predetermined frequencies. Further, a test system for testing a device under test is disclosed.

Abstract: A system for near-field measurement of a device under test in a far-field environment is provided. The system comprises a communication unit adapted to establish a far-field connection with the device under test. The system further comprises a measuring unit adapted to measure a magnitude and a phase of at least two field components. Moreover, the system comprises a processing unit adapted to perform far-field to near-field and/or near-field to near-field transformation of the field components in order to calculate field components at a specific surface in the near-field of the device under test.

Abstract: The present invention provides a test arrangement and test method for testing a wireless device under test. A first antenna may be arranged at a first distance from the device under test, and a second antenna may be arranged at a second distance from the device under test. In particular, the second antenna may be arranged closer to the device under test and the first antenna. Physical parameters characterizing the transmission properties between the individual antenna and the device under test are determined for the first and the second antenna. Test of the device under test is performed employing the second antenna, wherein the signals are rescaled based.

Abstract: A test equipment is provided for over the air tests on a device under test, in particular a user equipment, having a shielded space, at least one signal antenna for transmitting and receiving cellular signals arranged in the shielded space, and a plurality of noise antennas arranged in the shielded space linked in an array configured to create Additive White Gaussian Noise. The noise antennas are equally distributed in three dimensions within the shielded space. Further, a method for testing a device under test is shown.

Abstract: The present invention provides a test arrangement and test method for testing a wireless device under test. A first antenna may be arranged at a first distance from the device under test, and a second antenna may be arranged at a second distance from the device under test. In particular, the second antenna may be arranged closer to the device under test and the first antenna. Physical parameters characterizing the transmission properties between the individual antenna and the device under test are determined for the first and the second antenna.

Abstract: A multi-antenna test system is provided. The multi-antenna test system includes a device under test and at least four antenna devices. The at least four antenna devices are spaced apart in a fixed angular relationship with respect to the device under test to create different certain angular relations between each pair of the at least four antenna devices.

Abstract: A testing method for testing mobile communication devices comprises measuring a three-dimensional antenna pattern of an active phased antenna array (AAS) of the mobile communication device, with the AAS being maintained at a specific beamforming alignment during the measurement. A predefined base fading profile is calibrated with the measured three-dimensional antenna pattern to obtain an optimized fading profile adapted to the specific beamforming alignment. A channel model for emulation of a base station is emulated on the basis of the optimized fading profile. The method further involves performing a receiver test on the mobile communication device using the emulated channel model. The testing method may in some embodiments be a radiated two-stage over-the-air (RTS-OTA) testing method.

Abstract: A testing method for testing mobile communication devices comprises measuring a three-dimensional antenna pattern of an active phased antenna array (AAS) of the mobile communication device, with the AAS being maintained at a specific beamforming alignment during the measurement. A predefined base fading profile is calibrated with the measured three-dimensional antenna pattern to obtain an optimized fading profile adapted to the specific beamforming alignment. A channel model for emulation of a base station is emulated on the basis of the optimized fading profile. The method further involves performing a receiver test on the mobile communication device using the emulated channel model. The testing method may in some embodiments be a radiated two-stage over-the-air (RTS-OTA) testing method.