Rohde and Schwarz Gmbh & Co. Kg

Heinz Mellein

Vincent Abadie

Johannes Koebele

Thorsten Hertel

Niels Petrovic

Bledar Karajani

Corbett Rowell

Hendrik Bartko

Adrian Cardalda-Garcia

Juan-Angel Anton

Edwin Menzel

Jens Wappler

Ramez Khoury

Jochen Oster

Christian Schaefer

Carsten Sauerbrey

Oussema Harguem

Johannes Köbele

Christian Schäfer

The present disclosure generally relates to an anechoic chamber for testing a device under test over-the-air, a system, and a method. The anechoic chamber includes at least one reflecting surface being configured to variably manipulate in a defined manner at least one reflection process of at least one electromagnetic wave usable for testing the device under test.

Anechoic chamber for testing a device under test over-the-air, a system, and a method

A method for determining a pre-equalization matrix to be used for testing is provided. A radio communication tester is provided that has a base station emulator and a channel emulator. A device under test is provided that has at least two branches. A N×M multiple-input multiple-output (MIMO) connection is established between the radio communication tester and the device under test. The N×M MIMO connection includes at least two channels. Reference signal received power per branch measurement values are continuously forwarded from the device under test to the radio communication tester. A pre-equalization matrix is determined by the radio communication tester, wherein the reference signal received power per branch measurement values and presence of additive white Gaussian noise (AWGN) are taken into account when calculating the pre-equalization matrix. The pre-equalization matrix compensates cross-talk between the at least two channels and balances the branches such that the device under test receives equal power at its reception antennas. Further, a test setup is described.

Method for determining a pre-equalization matrix and test setup

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.

Test equipment for over the air tests as well as method for testing a device under test

A method for testing a device under test with regard to spherical coverage is described, wherein a device under test is placed in an anechoic space to which a measurement antenna is assigned. A spherical coverage test is performed. The spherical coverage test is stopped after a minimum test criteria has been fulfilled. Further, a test system is described.

System and method for testing a device under test within an anechoic chamber based on a minimum test criteria

A test system for over the air (OTA) measurements of transceiver performance metrics of a device under test is provided. The test system comprises a device under test (DUT), at least one positioning device, at least one measurement antenna, and at least one measuring/control processor. The at least one measurement antenna is configured to establish a data link to the DUT and to transmit/receive test data to/from the DUT via the data link. The at least one positioning device is configured to adjust the position of the at least one measurement antenna around the DUT to specific measurement points, wherein the specific measurement points are distributed randomly around the DUT.

Test system and method for over the air (OTA) measurements based on randomly adjusted measurement points

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.

Testing methods and systems for mobile communication devices

A system for testing a device under test with respect to a far-field region of the device under test is provided. The system comprises a test unit, and an antenna connected to the test unit. The test unit is configured to determine several samples of measured power values at different distances between the antenna and the device under test. In addition to this, the test unit is configured to calculate a minimum far-field distance on the basis of the several samples of measured power values.

System and method for testing with respect to a far-field region

A measuring unit for measuring transmission parameters of a device under test, comprising a control unit, a transmitter and receiver unit and an evaluation unit. The transmitter and receiver unit is connected via a first connection to the control unit and via at least one transmission channel to the device under test. The device under test is connected via a second connection to the evaluation unit, wherein, for the measurement of the transmission parameters of the device under test, control-data packets and test-data packets are transmitted separately between the control unit and the evaluation unit, and wherein a transmission channel for the test-data packets can be disturbed in a targeted manner.

Measuring unit and a method for measuring transmission parameters of a device under test

A test arrangement for wirelessly testing a device under test comprises a test antenna for receiving wireless signals from the device under test, a movable test antenna carrier that carries the test antenna and is movable to adjust the distance between the test antenna and the device under test, a transformation processor that is coupled to the test antenna and performs a near-field to far-field transformation based on the wireless signals received from the device under test and outputs respective transformed signals, and a signal processor that is coupled to the transformation processor and calculates a minimum far-field distance for the device under test based on the transformed signals, wherein the signal processor evaluates if the distance between the test antenna and the device under test is equal to or larger than the calculated minimum far-field distance.

Test arrangement and test method

A test method for testing a device under test with a measurement unit comprises transmitting a number of test commands from the measurement unit to the device under test via a test interface of the device under test, generating in the device under test in response to the test commands respective communication signals, emitting by the device under test the generated communication signals via a wireless communication interface, receiving signals from the device under test in the measurement unit, and evaluating the received signals in the measurement unit.

Method for testing a device under test, electronic device, and measurement unit

A measuring device for performing measurements of a measurement signal emitted by a communication network using a plurality of resource blocks includes a digital processor with a power detector for determining a Received Signal Strength Indicator (RSSI) indicative of a received power of user data within a number of resource blocks in the measurement signal and a Reference Signal Received Power (RSRP) indicative of a received power of reference signals within a number of resource blocks in the measurement signal. The measuring device further includes a resource determiner for determining occupied and unoccupied resource blocks based on the determined RSRP and the RSSI. The resource blocks each correspond to a specific time and frequency range and each include a number of resource elements which each correspond to a specific time and frequency range.

Measuring device and measurement method for non-intrusive throughput measurement in communication networks

A device for calibrating a digital communication station uses an initial ranging procedure for measuring channel parameters in a communication channel. The device comprises a communication emulator, a measuring device, and a calibrator. The communication emulator transmits a signal to the communication station which transfers the communication station into an initial ranging mode. The measuring device measures parameters of the signal transmitted by the communication station during an initial ranging cycle. From these measurements the calibrator calculates the necessary calibration adjustments to the communication station and adjusts it accordingly.

Growing community of inventors

Haar, Germany

Heinz Mellein