Abstract: A method for modeling an NR DUT using a MIMO OTA test system including a BTS configured to send and receive RF test signals to and from the DUT, and probes configured to reproduce a three-dimensional fading environment for the DUT placed in a quiet zone of an anechoic chamber in response to the RF test signals. The method includes building CIR files for fading channels provided by a channel emulator in the MIMO OTA test system; selecting preferred CIR files from the CIR files having corresponding channel power levels higher than a threshold corresponding to a minimum power level; and performing bi-directional fading emulation with the fading channels using the preferred CIR files, where remaining CIR files are disregarded. The probes reproduce the three-dimensional fading environment for the DUT in the quiet zone using the RF test signals adjusted by the bi-directional fading emulation with the fading channels.

Abstract: A method for characterizing a timestamping behavior of a device under test (DUT) includes, at a test system, transmitting packets to and receiving packets from the DUT. The test system controls transmit (Tx) timestamping of the packets transmitted to the DUT or receive (Rx) timestamping of the packets received from the DUT. The test system determines based on the Tx and Rx timestamping, timing measurements of the packets transmitted to the DUT and the packets received from the DUT. The test system uses the timing measurements to identify and characterize a timestamping behavior of the DUT.

Abstract: Methods, systems, and computer readable media for measuring voltage and current waveforms at devices under test. An example method includes outputting an electrical signal from a signal generator of a measurement instrument; measuring a first voltage at an input to an output resistance of the measurement instrument; measuring a second voltage at an output of the output resistance of the measurement instrument; and determining a test measurement voltage at a device under test (DUT) electrically connected to the measurement instrument using the first voltage, the second voltage, and a propagation delay of a transmission line electrically connecting the measurement instrument to the DUT.

Abstract: A method for implementing user authorization in cloud applications includes receiving a user token at a sub-authorization computing device from a user interface of a cloud application, and in response to a user login event. The sub-authorization computing device queries, using the user token, an identity provider for authorization status of a first user for the cloud application. The sub-authorization computing device receives from the identify provider an indication of authorization status of the first user to access at least one feature of the cloud application. First feature access data for the first user is determined using the indication of the authorization status of the first user and a feature map of the cloud application. The sub-authorization computing device sends the first feature access data to the user interface of the cloud application.

Abstract: A method for measuring the phase jitter and phase noise of a signal-under-test (SUT) includes providing first and second oscilloscopes each having a timebase reference oscillator, the timebase reference oscillator of each of the first and second oscilloscopes configured to generate a timebase reference signal of a given output frequency. The method further comprises phase-locking the timebase reference oscillators of the first and second oscilloscopes together, applying the SUT to an input channel of the first oscilloscope and to an input channel of the second oscilloscope, and generating a first phase jitter measurement of the SUT using the first oscilloscope and generating a second phase jitter measurement of the SUT using the second oscilloscope. The method still further includes obtaining the phase noise of the SUT from the first and second phase jitter measurements to obtain the phase noise of the SUT.

Abstract: A method for evaluating a load balancing (LB) mechanism, the method comprising: at a test system implemented using at least one processor: sending, via one or more paths comprising network nodes, a first set of test packets comprising transmit (TX) timestamps for evaluating a first LB mechanism; receiving, at a packet destination, the first set of test packets; generating receive (RX) timestamps for the first set of test packets at the packet destination; computing, by the packet destination or a packet analyzer, first in-flight metrics for the first set of test packets using the TX and RX timestamps, wherein computing the first in-flight metrics includes grouping the first set of test packets based on packet or flow characteristics and generating an average in-flight metric, a minimum in-flight metric, or a maximum in-flight metric for each of a plurality of groups; and evaluating the first LB mechanism using the in-flight metrics.

Abstract: Methods, systems, and computer readable media for locally storing cloud application user preferences are disclosed. One example method comprising: at a user device comprising at least one processor: obtaining, using a first representational state transfer (REST) application programming interface (API) endpoint and a local data store for storing user preference data associated with a first user of a user preferences service, user preference data for a first cloud application, wherein obtaining the user preference data includes obtaining, from a remote server, a default value for a first user preference of the user preference data when the local data store lacks a value for the first user preference; utilizing the user preference data to configure or present the first cloud application on the user device; detecting an updated value for the first user preference; and storing, in the local data store, the updated value for the first user preference.

Abstract: A method for identifying dependencies between network applications includes determining, from the network traffic or the network traffic metadata, counts indicating numbers of times that applications residing on the web servers are contacted after the same and other applications residing on the web servers and computing, using the counts and for each of the applications, a contact probability. The method further includes computing, using the counts and for each of the applications, an observed probability indicating a likelihood that the application will be contacted after another of the applications, and computing, from the contact probabilities and the observed probabilities, application dependency scores for pairs of the applications. The method further includes using the application dependency scores to determine relationships between the applications in the pairs of applications.

Abstract: A method is provided for automating testing of a SUT. The method includes providing an interface on a computing device to test instruments configured for testing the SUT, to software applications, and/or to browsers respectively running on the test instruments; providing an RPA application and an OCR application on the computing device; controlling the test instruments via the interface to perform a measurement of the SUT via the interface using the RPA application according to a predetermined test procedure; receiving test data from the test instruments via the interface in response to the measurement; capturing the test data and translating the captured test data to readable data using the OCR application; repeating the controlling of the test instruments, the receiving and capturing of the test data, and the translating of the captured test data to acquire aggregated test data; and generating a report populated with the aggregated test data.

Abstract: A method for analyzing data center congestion control includes capturing packets traversing network switches in a data center configured with data center quantized congestion notification (DCQCN) parameters to regulate congestion in the data center. The method further includes generating, from the captured packets, a congestion notification packet (CNP) profile for the data center and a visualization of real traffic rates in the data center. The method further includes configuring a DCQCN performance predictor with the DCQCN parameters and providing the CNP profile as input to the DCQCN performance predictor. The method further includes simulating, by the DCQCN performance predictor, congestion control of the data center and generating, as output, a visualization of simulated ideal traffic rates in the data center given the CNP profile and the DCQCN parameters.

Abstract: A method for phase-conjugate target emulation for testing a DSB FMCW radar includes selecting a proxy transponder from an array of frequency-shifting transponders to transmit an emulated target radar signal to a radar DUT. The proxy transponder is located at a mirror image location with respect to a desired DoA of a signal from an emulated radar target. The method further includes receiving a radar signal from the radar DUT and generating an output signal to be transmitted by the proxy transponder to the radar DUT by swapping roles of a normal sideband component and a ghost sideband component of the output signal such that the ghost sideband component appears to the radar DUT as a desired emulant and the normal sideband component appears to the radar DUT an undesired ghost sideband component. The method further includes transmitting the output signal to the radar DUT.

Abstract: A digital signal generator includes a numerically controlled oscillator (NCO) configured to generate a modulated phase signal, and to convert the modulated phase signal into a sinusoidal output signal, and a pre-distortion module configured to adjust a phase of the phase-modulated signal prior to conversion to the sinusoidal output signal, and to adjust an amplitude of the sinusoidal output signal to obtain a pre-distorted digital output signal. The phase and amplitude adjustments are frequency dependent, and the pre-distortion module is configured to determine an instantaneous frequency of the NCO by computing a derivative of the modulated phase signal, and to address a memory table correlating the determined instantaneous frequency with the phase and amplitude adjustments.

Abstract: A system, device and method for optimization of a radiated transmission matrix by the selecting probe antennae and applying a compensation network in the test system are described. Among other benefits, the anechoic chamber in which the DUT is disposed is comparatively small and inexpensive. The time-consuming process of inverse matrix tuning or isolation level checking that plagues known systems, device and methods of testing DUT is substantially avoided. Because of small size of shield box and probe antenna selection algorithm, low path loss and acceptable power in testing can be realized.

Abstract: A system and method test sustained and anti-islanding capabilities of EUT, where a power island is sustained without anti-islanding functionality and becomes de-energized with anti-islanding functionality. The method includes applying grid voltage to the EUT to obtain measurement current from the EUT; calculating RLC component values of a programmable RLC filter from measurement current and source voltage, including calculating target gain and phase, calculating target R, L and C parameters using the target gain and phase, and translating the target R, L and C parameters to physical parameters; applying the physical parameters and the measurement current to the programmable RLC filter to obtain RLC voltage; comparing the RLC voltage to source voltage; and when the RLC voltage is substantially the same as the source voltage, predicting that transition to a power island with the applied RLC component values will be sufficiently smooth to avoid triggering system protections of the EUT.

Abstract: A method for planning and executing a test of a DUT includes receiving a test description from a user via a GUI, where the test description identifies the DUT and an objective of the test; composing a prompt for querying a large language model (LLM) based on the test description, where LLM includes a trained machine learning algorithm; sending the prompt to the LLM via an API; determining, using the LLM, a test plan for executing the test to be performed in response to the prompt to achieve the objective of the test based on the test description and general testing information, where the test plan identifies a type of test, test instruments for performing the test, a test procedure using the instrument, and parameters of the DUT to be measured according to the test procedure; providing, via the GUI, the test plan to the user for testing the DUT.

Abstract: An optical system has a plurality of surfaces. In addition, a specification of a sequential ray trace through the optical system specifies an order of surface elements for tracing rays through the optical system. The sequential ray trace may be for stray light rays rather than for the primary rays propagating through the optical system. The surface elements include a surface set. The surface set includes at least two of the surfaces in the optical system. Rays are traced through the optical system according to the sequential ray trace. For example, the specification of the sequential ray trace may also specify a maximum number N of surface-intersections for the surface set. Rays are traced through the optical system with up to N surface-intersections with the surfaces in the surface set, and without regard to the order in which rays intersect the surfaces in the surface set.

Abstract: The subject matter described herein includes methods, systems, and computer readable media for analyzing and displaying wireless signal data captured by a wireless signal capture and data analyzer device. The method includes capturing wireless in-phase and quadrature (IQ) signals transmitted over an air interface between a real or emulated wireless base station and one or more real or emulated user equipment (UE) devices. The device stores parameters from the captured IQ signals in a log file and provides a graphical user interface (GUI) that displays the parameters and enables a user to select them. The GUI receives user inputs selecting one or more parameters and a selectable operators. The device then performs an operation corresponding to the selectable operator on the one or more parameters and generates an output and presents the output to the user via the graphical user interface.

Abstract: A system emulates multipath effects of a radar signal transmitted by a radar and reflected from an emulated target and an emulated surface. The system includes RTSs configured to generate and transmit emulated echo signals having different phases in response to the radar signal, where a first RTS is configured to emulate the emulated target, receiving the radar signal via a direct path, and at least one second RTS is configured to emulate at least one ghost target corresponding to the emulated target; and a controller configured to control the RTSs to generate and transmit the emulated echo signals at the different phases, which correspond to the RTSs receiving the radar signal from the radar transmitter and the radar receiver receiving the emulated echo signals from the RTSs over different combinations of the direct the indirect paths to replicate interference effects caused by multipath propagation.

Abstract: A hardware-in-the-loop (HiL) test system is for testing sensor fusion of an advance driver assistance system (ADAS). The ADAS includes a plurality of sensors and an electronic control unit (ECU) processing outputs of the sensors. The HiL test system includes a three-dimensional (3D) scenario simulator for generating drive scenarios including objects in a surrounding environment of a simulated vehicle, and a sensor target emulator for generating emulated sensors inputs to the plurality of sensors corresponding to the drive scenarios generated by the 3D scenario simulator. The sensor target emulator is configured to synchronize the emulated sensor inputs by interpolating a current location of the objects from parameters extracted from the drive scenarios.

Abstract: An antenna array controller is configured to measure a magnitude and phase of each of a set of antenna array elements, and compensate for leakage of other elements of the set of array elements. The leakage may be compensated for by one or more mechanisms including phase cancellation by row of antenna array elements, programmatic cancellation via a single offsetting antenna array element of the antenna array elements, and deembedding array leakage by subtracting the array leakage from the measured data.