Abstract: The present disclosure relates to a compact antenna test range (CATR) system. The CATR system comprises a measurement chamber, at least one feed antenna which is configured to transmit a radio frequency, RF, signal, at least one reflector which is arranged to reflect the RF signal towards a measurement area in the measurement chamber, and at least two preferably metallic calibration surfaces which can be arranged at two or more positions in the measurement area, wherein the calibration surfaces are configured to reflect a respective reflection of the RF signal back to the at least one reflector which is, in turn, configured to reflect the reflections of the RF signal back to the at least one feed antenna. The CATR system further comprises a measurement unit which is configured to receive the respective reflections of the RF signal and to determine and/or visualize a time difference between the reception of the respective reflections of the RF signal.

Abstract: A test system for testing a device under test is described. The test system includes a testing circuit and the device under test. The testing circuit is configured to establish a wireless connection with the device under test based on a wireless communication standard having a low energy protocol. The wireless connection includes a plurality of channels, wherein the plurality of channels is configured to transmit data packages between the testing circuit and the device under test. The testing circuit and the device under test are configured to communicate with each other via the plurality of channels by a channel hopping technique. A radio frequency (RF) level of a signal transmitted by the testing circuit in at least one test channel to be tested, which belongs to the plurality of channels, is lower than an RF level of a signal transmitted by the testing circuit in at least one other channel of the plurality of channels. Further, a test method of testing a device under test is described.

Abstract: 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.

Abstract: A method and a system for determining at least one contribution of at least one device under test (DUT) are described. The DUT may be part of a radio frequency (RF) device chain. The method includes capturing a first signal portion at a first node associated with an input of the DUT and capturing a second signal portion at a second node associated with an output of the DUT. The first signal portion and the second signal portion are captured quasi-simultaneously. The method may also include aligning the captured first signal portion and the captured second signal portion with each other temporally, and determining the contribution of the DUT by comparing the first signal portion and the second signal portion.

Abstract: A method of simulating an effect of interactions between a device under test and a scattering object by of a hybrid over-the-air (OTA) test system is described. The method includes the steps of determining at least one radiation parameter of the device under test, wherein the at least one radiation parameter is associated with electromagnetic waves emitted by the device under test; determining an equivalent source on a Huygens surface based on the at least one determined radiation parameter, wherein the equivalent source is associated with the device under test; assigning material properties to a Huygens box confined by the Huygens surface, wherein the material properties are associated with at least one of reflection of electromagnetic waves and absorption of electromagnetic waves; and simulating an electromagnetic interaction between the device under test and the scattering object based on the determined equivalent source and based on the assigned material properties.

Abstract: A housing wall includes at least one air grid having at least a first layer with a first mesh structure and a second layer with a second mesh structure. The first mesh structure is coextensively arranged with the second mesh structure. The first layer and the second layer are electrically conductively coupled. The first mesh structure includes a first plurality of through-holes. The second mesh structure includes a second plurality of through-holes. The through-holes of the first plurality of through-holes are misaligned compared to through-holes of the second plurality of through-holes such that a nonuniform total through-hole configuration of the air grid is provided.

Abstract: A phase-shifted sampling module for sampling a signal is described. The phase-shifted sampling module includes a primary sampler module, an ADC module, and an equalization module. The primary sampler module includes an analog signal input, a first signal path, and a second signal path. The equalization module includes a primary sampler equalizer sub-module. The primary sampler equalizer sub-module is configured to compensate low-frequency mismatches between the first signal path and the second signal path. Further, a method for determining filter coefficients of an equalization module of a phase-shifted sampling module is described.

Abstract: A measuring device includes a first measuring port connected to an optical interface which can be connected to an optical input or output of a device under test (DUT). The device includes a second measuring port which can be connected to a radio frequency (RF) input or output of the DUT. The optical interface is connected to the optical input of the DUT and the second measuring port is connected to the RF output of the DUT. The first measuring port generates an analog measuring signal and provides it to the optical interface. The optical interface generates an optical measuring signal based on the analog measuring signal and provides it to the optical input of the DUT. The second measuring port receives an analog measuring signal generated by the DUT based on the optical measuring signal. The processor determines S-parameters of the DUT based on the two analog measuring signals.

Abstract: A method of coordinating multiple instances of user plane traffic processing in a data network is described.

Abstract: A method of testing user equipment for non-terrestrial networks is described. The method includes, for example, the steps of: providing GNSS data and ephemeris data by a test system, wherein the GNSS data is associated with a position of a user equipment (UE) device of a non-terrestrial network, and wherein the ephemeris data is associated with a position of a satellite node of the non-terrestrial network; transmitting the GNSS data and the ephemeris data to the UE device; determining a timing advance and/or a Doppler pre-compensation shift by the UE device based on the GNSS data and the ephemeris data; generating an uplink signal by the UE device based on the determined timing advance and/or the determined Doppler pre-compensation shift; and analyzing the uplink signal by the test system in order to assess a performance of the UE device. Further, a test system for testing user equipment for non-terrestrial networks is described.

Abstract: The present disclosure relates to a parallel filter structure for processing a signal. The parallel filter structure includes a signal input configured to receive a time and value discrete input signal. The parallel filter structure includes a feed forward equalizer circuit connected with the signal input for receiving the time and value discrete input signal. The parallel filter structure includes a decision feedback equalizer circuit connected with the signal input for receiving the time and value discrete input signal. The feed forward equalizer circuit and the decision feedback equalizer circuit together form a parallel circuit. Further, an oscilloscope and a method of processing a signal are provided.

Abstract: A signal processing system is described. The signal processing system includes at least one signal processing path and a control module. The at least one signal processing path includes at least one signal input and at least two filter units. The at least two filter units include at least one hardware filter unit. The at least one signal input is connectable to at least one external electronic component. The control module is connected to the signal input and to the at least two hardware filter units. The control module is configured to determine a frequency response deviation being associated with the at least one external electronic component. The control module further is configured to reconfigure the at least one hardware filter unit such that the frequency response deviation is compensated at least partially. Further, a signal processing method for adapting filter coefficients of a signal processing system is described.

Abstract: A probe tip module includes a probe tip interface and a probe tip memory. The probe tip interface is connectable to a probe main module. A reduced characterization data set is stored in the probe tip memory. The prove tip module may be part of a probe system or a measurement system.

Abstract: The present disclosure relates to a system for attempting to establish a connection between a mobile phone and a virtual node of a cellular network. The system includes the virtual node that is configured to be switchable such that the virtual node is switched off and on in a defined manner. The virtual node is configured to automatically change at least one cell parameter each time the virtual node is switched off and on. Further, the present disclosure relates to a method of attempting to establish a connection between a mobile phone and a virtual node of a cellular network.

Abstract: A method of determining a signal histogram having a predetermined number of bins. The method includes: receiving an input signal; decimating the input signal, thereby generating a decimated signal that includes a maximum signal value and a minimum signal value associated with the maximum signal value; assigning the maximum signal value to a maximum bin of a signal histogram; assigning the minimum signal value to a minimum bin of the signal histogram; and filling at least one intermediate bin of the signal histogram with an intermediate value, wherein the intermediate bin is located between the minimum bin and the maximum bin in the signal histogram.

Abstract: A method of performing a measurement of a device under test by using an antenna array.

Abstract: An external frontend device is described. The external frontend device includes an integrated synthesizer circuit, a reference signal input, a receiver channel, a transmitter channel, and at least one mixer circuit. The reference signal input is configured to receive a low-frequency reference signal. The reference signal input is configured to forward the received low-frequency reference signal to the integrated synthesizer circuit. The integrated synthesizer circuit is configured to generate a local oscillator (LO) signal based on the low-frequency reference signal. The at least one mixer circuit is associated with the receiver channel and/or with the transmitter channel. The at least one mixer circuit is configured to mix the LO signal with a radio frequency (RF) signal processed by the receiver channel and/or with an intermediate frequency (IF) signal processed by the transmitter channel, thereby obtaining an IF output signal and/or an RF output signal, respectively.

Abstract: Embodiments of the present disclosure relate to methods of finding optimized analog measurement hardware settings of a measurement system for a target measurement. The method can include one or more of the following steps: applying initial settings to the measurement system; varying the settings over a power sweep while processing a test signal used for the target measurement or a representative signal; performing the target measurement during the power sweep, thereby determining a hardware contribution of the measurement system over the power sweep; and identifying the respective settings that lead to a minimum hardware contribution of the measurement system at various powers.

Abstract: The present disclosure concerns a method of processing measurement data. The method includes gathering measurement data by a measurement component, processing the measurement data by the measurement component, thereby producing at least one two-dimensional histogram of a measurement quantity depending on a variable for at least one period of time, forwarding, by the measurement component, the at least one two-dimensional histogram to a processing component, and processing, by the processing component, the at least one two-dimensional histogram received from the measurement component, thereby generating data associated with at least one histogram and data associated with a waterfall diagram having several waterfall lines, wherein each of the several waterfall lines is associated with an individual histogram. Further, the present disclosure concerns a system for processing measurement data.

Abstract: The invention relates to a method for determining a deviation of a broadband measurement signal from a reference signal. The method provides the steps: subdivision of the signal into at least two measurement-signal frequency bands; displacement of the measurement-signal frequency bands; and reconstruction of the at least two measurement-signal frequency bands. A corresponding measurement device is also contained within the idea of the invention.