96 results about "Vector signal analyzer" patented technology

The invention provides a wireless signal tester calibration device and a method. A frequency meter is used for calibration of an output frequency of output signals of the wireless signal tester; a microwave power meter is used for calibration of output power of output signals of the wireless signal tester; a vector signal analyzer is used for EVM calibration of output signals of the wireless signal tester; a vector signal transmitter and the microwave power meter are used for calibration of power measurement of the wireless signal tester; the vector signal transmitter and the vector signal analyzer are used for calibration of EVM measurement of the wireless signal tester; and thus, reliability of performance test on the corresponding wireless transmitting and receiving equipment by using the wireless signal tester can be ensured. The invention also provides an automatic testing system and a method. The calibration device of the invention can be used for carrying out automatic calibration on the wireless signal tester, and the wireless signal tester after calibration is used for automatically testing to-be-tested wireless equipment.

A new measurement system, with two receiver channels per measurement port, has been developed that provides absolute magnitude and absolute phase relationship measurements over wide bandwidths. Gain ranging is used at RF to provide optimum noise performance and a swept YIG preselector filter is used to avoid spurious signals. A new absolute vector error correction method is used to calibrate the measurement system in order to allow for absolute vector measurements, and it also removes the time-varying responses caused by the swept YIG preselector filters. A quasi-reciprocal mixer with a characterized non-reciprocal ratio is used to provide the absolute calibration standard. The two receiver channels can be adapted to a wide variety of applications, including wide bandwidth vector signal analyzer measurements, mixer measurements, and harmonic measurements. The two-channels can also be used as an absolute calibrated transmitter / reflectometer.

A signal analyzer and method for measuring signal compression levels of one or more individual orthogonal frequency division multiplexed (OFDM) signals among a plurality of OFDM signals within a composite signal.

An automatic test system for measurement and control subsystems suitable for navigation satellites, including integrated baseband equipment, frequency converters, vector signal analyzers, microwave signal sources, power meters, frequency meters, radio frequency channel equipment and test computers. The measurement and control integrated baseband equipment completes the modulation and demodulation of signals below the intermediate frequency, and the baseband processing of telemetry, remote control, and ranging signals; the up-down converter completes the output of the measurement and control integrated baseband equipment, and the conversion of the input signal from the intermediate frequency to the RF frequency; the RF channel equipment completes the RF signal Power control, channel switching, signal filtering; vector signal analyzer, microwave signal source, power meter, frequency meter and other general test equipment are used as performance index test equipment to complete the corresponding index test. All devices are connected to the internal network of the test system through their own network ports or interface conversion devices, and are uniformly scheduled by the system test software running on the test computer to complete the automated test.

Signal conversion circuitry and method for converting a multiple input, multiple output (MIMO) packet data signal transmission to a plurality of complex data samples for processing by shared test equipment, e.g., a single vector signal analyzer (VSA).

The invention provides a compensation method of error vector magnitude (EVM). The method comprises the following steps: according to a mathematical expression of a digital vector, analyzing technical parameters which are related to the EVM of vector demodulation, determining parameters which are generated after vector demodulation and influence the EVM, respectively calculating all the technical parameters influencing the EVM so as to get technical components influencing the EVM value, and calculating a theoretical estimated value of the EVM by square-sum-root calculation. According to the compensation method disclosed by the invention, the scientific and reasonable compensation of the EVM can be realized and a great effect of evaluating the measurement results of measuring the EVM by various vector signal analyzers can be realized. In the technical field of metering, the compensation method has greater practical value, plays a role in guiding technical development and production and further has the advantage of extensive application prospect.

A system employing vector signal generator (VSG) and vector signal analyzer (VSA) modules or cards that are configured to test multiple devices under test simultaneously. Each VSG is configured to generate multiple RF test signals and send them to multiple devices under test simultaneously. Similarly, each VSA is configured with multiple signal receiving modules connected to a single controller or memory. Each signal receiving module receives an RF signal from a device under test, converts it to a baseband digital signal, and transmits this digital signal to the VSA's memory. A single RF testing system can employ multiple such VSGs and VSAs, each capable of evaluating multiple devices under test. Each VSG / VSA can further be tuned for operation in discrete or defined frequency bands, which are narrower than those for conventional RF testers, and which can correspond to various wireless standards.

The invention relates to a test technology for a wireless communication system and particularly relates to a physical layer test system and method based on an ARM (advanced RISC (reduced instruction set computer) machine) and DSP (digital signal processing) multi-core structure. The system comprises a control device, a signal source, a vector signal analyzer and a tested terminal. The method comprises a plurality of steps. According to the physical layer test system and method disclosed by the invention, codes of a physical layer in the field of wireless communication can be tested alone under the situation that upper-layer protocol codes are absent, development and test time can be shorted, test cost can be reduced and the automatic test of the codes of the physical layer can be conveniently and quickly realized.

The invention discloses a method and a system for metering digital demodulation error parameters based on a continuous wave combination method. The method can comprises the following steps of generating a continuous wave signal with a carrier frequency being sum or difference of a first frequency and a second frequency, wherein the second frequency is smaller than the first frequency; and inputting the generated continuous wave signal as an equivalent digital modulation signal into an input terminal of a vector signal analyzer (VSA), wherein the carrier frequency of the VSA is set to be the first frequency, a demodulation mode is set to be an M-system phase shift keying (MPSK), the symbol velocity is set to be M times of the second frequency, and M is an positive integer. In the invention, because the error parameters of the equivalent digital modulation signal for calibrating the VSA generated by the method can be precisely set and calculated, two problems that value source tracing and error setting of the digital demodulation error parameter can be synchronously solved.

An apparatus and method for error vector amplitude correction of wideband vector modulated signals are disclosed. The device includes a computer, an arbitrary waveform generator, an upconverter, a real-time oscilloscope and a reference clock. The method of the invention reduces the error vector amplitude of the wideband vector modulation signal through the error vector amplitude correction of thewideband vector modulation signal by the computer for many times, and provides the wideband vector modulation signal with high quality for the fields of wideband digital communication, the calibrationof the vector signal analyzer and the vector signal generator, and the like.

The invention provides an apparatus and method for simultaneous testing of multiple orthogonal frequency division multiplex (OFDM) signal. A vector signal analyzer (600) transforms multiplex signal that is received via a signal communication path and includes a plurality of OFDM signal for providing a plurality of transformed data signal, wherein, multiplex signal data source includes a remote signal source of a plurality of signal transmitting processes relatively, and includes a plurality of data groups, each data group includes respective parts of a plurality of preposing code data, and respective parts of a plurality of transmitting data, each respective parts of a plurality of transmitting data and each one of a plurality of data transmitting processes and respective parts of a plurality of known data relative to the signal communication path, and each one of a plurality of transformed data signal including respective parts of a plurality of data groups, and at least respective parts of receiving and processing a plurality of known data, a plurality of preposing code data, at least respective parts of a plurality of transmitting data for providing a plurality of detection data of error vector amplitude (EVM) associated with multiplex data signal.

Techniques are disclosed related to determining delay in a radio frequency (RF) communications device configured to perform envelope tracking. The RF communications device may comprise a power amplifier and an envelope tracker. First and second input stimuli signals may be transmitted to each of the power amplifier and envelope tracker, respectively. The RF communications device may output, by the power amplifier, an output signal to a vector signal analyzer (VSA). The VSA may determine a first delay offset by cross-correlating the output signal with a reference signal, and the VSA may determine a second delay offset based on an amplitude distortion of the output signal. A relative delay between the first and second input stimuli signals may be determined based on a difference between the first and second delay offsets.

Various embodiments are described of devices and associated methods for processing a signal using a plurality of vector signal analyzers (VSAs). An input signal may be split and provided to a plurality of VSAs, each of which may process a respective frequency band of the signal, where the respective frequency bands have regions of overlap. Each VSA may adjust the gain and phase of its respective signal such that continuity of phase and magnitude is preserved through the regions of overlap. The correction of gain and phase may be accomplished by a complex multiply with a complex calibration constant. A complex calibration constant may be determined for each VSA by comparing the gain and phase of one or more calibration tones generated with each region of overlap, as measured by each of the VSAs.

The invention discloses a time domain and modulation domain parameter combined measuring method of triangular frequency-modulation pulse signals and mainly solves the problems of low parameter accuracy and high operation load in measurement of the triangular frequency-modulation pulse signals in the prior art. The time domain and modulation domain parameter combined measuring method includes steps of 1, acquiring real and imaginary part discrete values of the triangular frequency-modulation pulse signals by a signal analyzer; 2, calculating signal envelopes of the triangular frequency-modulation pulse signals according to the discrete values; 3, estimating the approximate amplitude of the triangular frequency-modulation pulse signals by the signal envelopes; 4, setting a judgment threshold by the approximate amplitude and detecting the number of pulses; 5, calculating the pulse width of each pulse; 6, calculating various time domain parameters by the number of the pulse and the pulse widths; 7, calculating instant frequency of the triangular frequency-modulation pulse signals on the basis of the time domain parameters; 8, calculating various modulation domain parameters of the triangular frequency-modulation pulse signals by the instant frequency. The simulation results indicated that the time domain and modulation domain parameter combined measuring method is low in operation load and higher in accuracy under the condition of high signal to noise ratio as compared with existing methods.

The invention discloses a digital modulation quality parameter metering method and system based on the setting of a baseband constellation diagram, which are used for solving the problem that a VSA (vector signal analyzer) can not be accurately and completely calibrated because modulation errors can not be stably and accurately set and modulated. When the VSA is calibrated by the invention, the baseband constellation diagram is firstly configured according to the modulation mode and the target modulation error parameters; the constellation diagram is set in a VSG (vector signal generator), and the consistent modulation and demodulation parameters are set for the VSA and the VSG; and finally, the modulation errors are measured in the VSA, and the VSA is calibrated according to the difference value of the modulation errors which are obtained through the measurement with the preset modulation errors. In the invention, the standard signals which are generated based on the baseband constellation diagram are real vector modulation signals, and the modulation errors of the digital modulation signals which are emitted by the VSG can be stably and accurately set and adjusted based on the baseband constellation diagram, thus the integrity and accuracy of the VSA calibration are improved.

The present invention relates to a method for realizing a communication measurement instrument resampling based on a Newton backward interpolation filter. The method comprises a step of receiving the sampling data of a communication measurement instrument, a step of carrying out resampling on the sampling data according to the interpolation extraction algorithm of the Newton backward interpolation filter and further providing the baseband IQ signal resampling method of a vector signal generator and the baseband IQ signal resampling algorithm of a vector signal analyzer. By using the method, the baseband signal resampling of any ratio can be realized, the method has the advantages of a simple structure, high efficiency, and a wide conversion rate and is especially suitable for an occasion with a symbol rate wide range and continuous variation such as a signal source and an analyzer, and the computing speed is quick when the conversion rate is large. A K-order Newton backward interpolation filter comprises (3K-1) adders and (2K-1) multipliers, and compared with the K2 adders and K2 multipliers of a K-order FARROW filter, the complexity of the algorithm is reduced, the Newton backward interpolation filter has a wider range of application.

The invention relates to a method for testing emission parameters of a wireless local area network. According to the method, the emission parameters are tested after emission parameter signals of the wireless local area network are converted into low-frequency digital signals. Correspondingly, the system for testing the emission parameters of the wireless local area network comprises an emission parameter testing module and a PXI (peripheral component interconnect extensions for instrumentation) hardware modular instrument, and the PXI hardware modular instrument comprises a PXI vector signal analyzer including a digitizer, a down converter and a continuous waveform generator. By means of mutual connection of the digitizer, the down converter and the continuous waveform generator, the emission parameter signals of the wireless local area network are converted into the low-frequency digital signals, and the low-frequency digital signals are transmitted to the emission parameter testing module for testing. The system can greatly enhance sharing and interaction of tested information so as to play a good guide role in development of testing systems and has high performance and precision, and testing efficiency is improved.

The invention provides a vector signal analysis device. The vector signal analysis device is characterized in that an ADC (analog to digital converter) module performs A / D quantification on a received intermediate frequency signal, an I / Q (in-phase / quadrature) convertor performs I / Q conversion on a digital signal output by the ADC module so as to obtain base band I / Q data, an integer extraction module receives an I / Q signal output by the I / Q convertor, and extracts the I / Q signal after down conversion by integral multiples, a decimal fraction extraction module converts data velocity of I / Q data output by the integer extraction module into code element velocity which is an integral multiple of the data velocity, and further can perform decimal fraction multiple data velocity extraction conversion on an I / Q data file, and a vector demodulation analysis module performs subsequent vector demodulation analysis on I / Q data output by the decimal fraction extraction module. The vector signal analysis device can perform the flexible and complete vector demodulation analysis on digital modulation signals, uses the fixed velocity to perform A / D sampling, performs the I / Q conversion and integral multiple sampling rate conversion in a programmable device, and reduces design difficulty of A / D sampling of an existing vector signal analyzer and programmable hardware.