A system for testing a Nakagami fading channel and a verification method thereof are provided. The testing system includes a signal generator, a Nakagami fading channel simulator, and a computer. The signal generator is used to output a sine wave signal whose frequency is f and transmit the sine wave signal to the Nakagami fading channel simulator and the computer. The Nakagami fading channel simulator is used to generate a Nakagami fading channel. The computer is used to perform data processing and analysis. In the verification method, time domain fading characteristics, first-order statistics characteristics, and second-order statistics characteristics of the Nakagami fading channel are respectively verified. Verifying the time domain fading characteristics is verifying a waveform fluctuation rate and a fluctuation range on a time domain under different Nakagami fading factors. Verifying the first-order statistics characteristics is mainly verifying amplitude and phase distribution statistics characteristics of the Nakagami fading channel by means of Kolmogorov Smirnov (KS) hypothesis test. Verifying the second-order statistics characteristics is mainly verifying the shape and bandwidth of a power spectrum density function. In the present invention, verification on performance of the Nakagami fading channel simulator or a simulation model has features of accuracy and feasibility.

An information processing method includes receiving, by the controller via a communication interface, screen information regarding measurement information on a physical quantity from one or more waveform analyzers that acquire the measurement information, transmitting, by the controller via the communication interface, the acquired screen information to a plurality of operation terminals, receiving, from a first operation terminal of the plurality of operation terminals, a request for operation on the one or more waveform analyzers through the screen information, determining, by the controller, whether a control right to operate the one or more waveform analyzers is granted to any operation terminal of the plurality of operation terminals except the first operation terminal, and granting, by the controller, the control right to the first operation terminal in response to determining that the control right is not granted to any operation terminal of the plurality of operation terminals except the first operation terminal.

An information processing method includes receiving, by the controller via a communication interface, screen information regarding measurement information on a physical quantity from one or more waveform analyzers that acquire the measurement information, transmitting, by the controller via the communication interface, the acquired screen information to a plurality of operation terminals, receiving, from a first operation terminal of the plurality of operation terminals, a request for operation on the one or more waveform analyzers through the screen information, determining, by the controller, whether a control right to operate the one or more waveform analyzers is granted to any operation terminal of the plurality of operation terminals except the first operation terminal, and granting, by the controller, the control right to the first operation terminal in response to determining that the control right is not granted to any operation terminal of the plurality of operation terminals except the first operation terminal.

A system is provided to analyze cross-modulation distortion in audio devices, which may include testing with audio frequencies. One or more distortion signals from the audio device may be measured for an amplitude, phase, and or frequency modulation effect. In another embodiment a musical signal may be used as a test signal. Providing additional test signals to the audio device can induce a time varying cross-modulation distortion signal from an output of the audio device. Also utilizing at least one additional filter, filter bank, demodulator and or frequency converter and or frequency multiplier provides extra examination of distortion. Also frequency and or phase response can be measured with the presence of a de-sensing signal and or another signal that induce near slew rate limiting or near overload condition of the device under test.

A system is provided to analyze cross-modulation distortion in audio devices, which may include testing with audio frequencies. One or more distortion signals from the audio device may be measured for an amplitude, phase, and or frequency modulation effect. In another embodiment a musical signal may be used as a test signal. Providing additional test signals to the audio device can induce a time varying cross-modulation distortion signal from an output of the audio device. Also utilizing at least one additional filter, filter bank, demodulator and or frequency converter and or frequency multiplier provides extra examination of distortion. Also frequency and or phase response can be measured with the presence of a de-sensing signal and or another signal that induce near slew rate limiting or near overload condition of the device under test.

A method for at least one of detecting and classifying a wanted signal in an electromagnetic signal is described. The method includes the following steps: the electromagnetic signal is received; a spectrogram of the electromagnetic signal is determined; at least one correlation parameter, for example a correlation multi-dimensional algebraic object including several correlation parameters, is determined based on the determined spectrogram; the at least one correlation parameter is used as an input for a machine learning module; the wanted signal in the electromagnetic signal is detected and/or classified via the machine learning module based at least partially on the at least one correlation parameter. Further, a signal detection and/or classification system and a computer program are described.

To facilitate disturbance measurements within a WLAN network, a portable measuring device is introduced. The portable measuring device comprises at least a casing, one or more interfaces to detachably connect an external device to the portable measuring device, a processor placed in the casing, one or more antennas, two simultaneously operating radios placed in the casing, one or more power sources placed in the casing, and a power switch.

To facilitate disturbance measurements within a WLAN network, a portable measuring device is introduced. The portable measuring device comprises at least a casing, one or more interfaces to detachably connect an external device to the portable measuring device, a processor placed in the casing, one or more antennas, two simultaneously operating radios placed in the casing, one or more power sources placed in the casing, and a power switch.

Systems, devices, software, and methods of the present invention enable frequency-based signal power analyses in software suitable for signal with either stationary and non-stationary spectrums. The methods that may be used throughout various systems including transmitters receivers, repeater, controllers, monitors, etc. and in software simulators to enable various signal power calculations and analyses, such as frequency spectrum analysis, throughout operating systems and that may be consistently applied in system design and operation simulations in a wide range of applications, such as interference and spectrum monitoring or clearance, object tracking, transmission channel and noise analyses, radiated power analysis, signal boundary interference, satellite downlink signal identification, pulsed radar monitoring, audio detection and identification, etc.

Systems, devices, software, and methods of the present invention enable frequency-based signal power analyses in software suitable for signal with either stationary and non-stationary spectrums. The methods that may be used throughout various systems including transmitters receivers, repeater, controllers, monitors, etc. and in software simulators to enable various signal power calculations and analyses, such as frequency spectrum analysis, throughout operating systems and that may be consistently applied in system design and operation simulations in a wide range of applications, such as interference and spectrum monitoring or clearance, object tracking, transmission channel and noise analyses, radiated power analysis, signal boundary interference, satellite downlink signal identification, pulsed radar monitoring, audio detection and identification, etc.