Abstract: As single-ended signaling is implemented in higher-speed communications, accurate and consistent reading of the data signal becomes increasingly challenging. In particular, single-ended links can be limited by insufficient timing margins for sampling a received input signal. A single ended receiver provides for improved timing margins by adjusting a reference voltage used to sample the input signal. A calibration pattern is provided to the receiver as the input signal, and the reference voltage is adjusted toward a median value of the signal.

Abstract: An apparatus is disclosed where a Maximum power point tracking (MPPT) circuit is used to transmit data into the photovoltaic network, where the PLC communication is pulling the required transmit energy from the photovoltaic network, where the transmit chain is using the MPPT transistor of the photovoltaic DC Optimizer, where the transmit chain is transmitting data using Standard modulation such as ASK, FSK, S-FSK, BPSK, OFDM, etc. . . . where the transmitted data are passed on to the powerline network by the use of an “Input signal” adaptation stage, where signals summation is performed to create a command signal used to control the transmission of data by providing enough voltage to polarize the Transistor (i.e: MOS FET) used in the powerline path.

Abstract: Testing a Decision Feedback Equalizer (‘DFE’), the DFE including a summing amplifier operatively coupled to a plurality of latches and an input signal line for receiving a data signal, including: preventing a differential data signal from being received by the summing amplifier; and iteratively for each tap to be tested: setting a tap coefficient for each tap to zero; setting an output of the plurality of latches to a predetermined value; setting a tap coefficient for the tap to be tested to a full scale value; and determining whether a resultant output signal from the DFE matches a predetermined expected output signal.

Abstract: A method of facilitating wireless testing of multiple radio frequency (RF) signal transceiver devices under test (DUTs). Using multiple antennas within a shielded enclosure containing the DUTs, multiple wireless RF test signals radiated to the DUTs can have their respective signal phases controlled to maximize the direct-coupled signals to their respective intended DUTs while minimizing the cross-coupled signals. Additionally, the wireless RF test signals radiated to the DUTs can have their respective signal magnitudes controlled to normalize the direct-coupled signals to their respective intended DUTs while still sufficiently reducing the cross-coupled signals. As a result, compensation is provided for the multipath signal environment within the shielded enclosure, thereby simulating wired test signal paths during wireless testing of the DUTs.

Abstract: An apparatus, method and system for beam-steering configurations and tests in a communication system. In one embodiment, the apparatus includes a processor 620 and memory 650 including computer program code. The memory 650 and the computer program code are further configured to, with the processor 620, cause the apparatus to receive a beam-steering test configuration from a serving network element in response to a request for a beam-steering test with a network element, and perform the beam-steering test with the network element in the beam-steering test configuration.

Abstract: A system and method of frequency offset compensation are disclosed for a wireless system between a fast moving radio terminal associated with a locomotive and a stationary radio terminal associated with a base station. The present invention utilizes advanced frequency offset prediction to quickly track Doppler Shift caused by a fast moving locomotive. In one embodiment according to the present invention, the frequency offset prediction is based on a first plurality of coarse frequency offsets, first-order derivatives of the first plurality of coarse frequency offsets, and second-order derivatives of the first plurality of coarse frequency offsets. In another embodiment according to the present invention, the frequency offset prediction is based on a plurality of previous frequency offsets according to a Doppler shift model.

Abstract: A device may include one or more components and a processor. The one or more components may obtain bit-error-rates of a signal and signal-to-noise ratios of the signal. The processor may select a target signal-to-noise ratio for the signal, determine a target noise level based on the target signal-to-noise ratio, set a noise level of the signal to the target noise level, determine a signal-to-noise ratio of the signal via the one or more components, adjust the noise level of the signal based on the determined signal-to-noise ratio, to stabilize the signal-to-noise ratio, determine a bit-error-rate of the signal via the one or more components, and record the bit-error-rate.

Abstract: In a data processing device and a method for analyzing stability of the data processing device, one or more sets of equalization parameters and a predetermined bit error ratio (BER) are received. Times and voltages of data points that represent a waveform of an electronic signal generated by the data processing device are read, and an output type of the electronic signal is selected to obtain a time interval of outputs of the electronic signal. Optimal equalization parameters are selected from the one or more sets of equalization parameters to compute a sample interval. Interfering voltages of the electronic signal are computed to select a frequency which is equal to the predetermined BER, and the interfering voltages corresponding to the selected frequency are obtained. An eye pattern is established using the interfering voltages corresponding to the selected frequency, and a determination is made according to the eye pattern.

Abstract: A method for testing Bit Error Rate (BER) of a network module of a communication device includes executing a BER test program to begin a BER test; obtaining a current time and a test data of the BER test program; recording the current time and the test data corresponding to the current time in the test data recording document. The method also determines whether a time interval between the current time and a time when a last test data was recorded is greater than a predetermined value, and if so records a new time and a new test data.

Abstract: Embodiments related to line testing are described and depicted. A digital subscriber line testing apparatus comprises a plurality of resistors and a switching device. The switching device comprises first and second signal inputs to couple the switching device to a signal generator output, and a plurality of wire terminals. The switching device is configured to switch the plurality of resistors into a first switching state and a second switching state.

Abstract: In a particular embodiment, a circuit device includes a peak detector to receive a signal and to generate peak output data related to the received signal and an average detector to generate average output data related to the received signal. The circuit device further includes a logic circuit to generate a data output related to the received signal based on the generated peak output data and the generated average output data.

Abstract: One embodiment of the present invention relates to a method and apparatus are provided herein for reducing the power consumption of a transmission chain while maintaining an acceptable figure of merit (e.g., linearity). In one embodiment, an adaptive biasing element is configured to perform adaptive biasing to reduce current consumption of a transmission chain by adjusting the operating point of one or more transmission chain elements (e.g., power amplifier, mixer, etc.). However, since adaptive biasing may reduce the linearity of a transmitted signal, its use is limited by the degradation of figure of merit caused by the introduced non-linearities. Accordingly, a pre-distortion element may be configured to perform adaptive digital pre-distortion (DPD) on a transmission chain input signal to account for non-linearities generated through the adaptive biasing, therefore allowing the adaptive biasing to further reduce the current consumption while maintaining an acceptable figure of merit.

Abstract: A calibration sub-system for calibrating a unit of a distributed antenna system is provided. The calibration sub-system includes a signal generator, a receiver, and a processor. The signal generator provides test signals to a communication path that are generated based on modification schemes for an in-phase signal component (“I component”) or a quadrature signal component (“Q component”). The receiver receives output signals generated from test signals. The processor determines output power values for an undesirable signal component of the output signals. Each output power value is a Taylor series function or a polynomial function of a respective modification scheme for the I or Q component of the respective test signal. The processor determines an optimal modification scheme for the I or Q component that minimizes an output power of the undesirable signal component. An output value of the function is minimized by having the optimal modification scheme as an input.

Abstract: A correlation engine includes a first register configured to receive a test data signal, a second register configured to receive a main data signal, first shift logic configured to shift the test data signal by a predetermined value between 0 and 3 symbols, second shift logic configured to shift the main data signal by a predetermined value between 0 and 20 symbols, and comparison logic configured to compare the shifted test data signal and the shifted main data signal to generate an error signal.

Abstract: A data collector combiner, a network management system, a DSL Optimizer (DSLO), or any combination thereof collects data, parameter(s), characteristic(s), information, or any combination thereof from two or more data sources. The data collector probabilistically combines at least the first and second data to estimate at least one DSL characterizing parameter.

Abstract: The present invention includes receiving a signal from an output of a dispersive communication channel established between a transmitter and a receiver, determining normalized Nyquist energy of the signal transmitted along the dispersive communication channel established between the transmitter and the receiver, and generating a mapping table configured to identify peaking value at or above a selected tolerance level at or near the Nyquist frequency for a signal received by the receiver based on the normalized Nyquist energy.

Abstract: A Bluetooth receiver comprises a RF front end configured to receive a Bluetooth signal including a preamble and 34-bit pseudo-number (PN); a DC estimator communicatively coupled to the RF front end; and a frame synchronizer communicatively coupled to the DC estimator. The DC estimator is configured to perform DC offset estimation by determining an average value of samples of the preamble and the frame synchronizer is configured to use the 34-bit PN for frame synchronization.

Abstract: Eye diagram scan circuit and associated method for a receiver circuit, including a level adjust circuit, a phase interpolator and a control module. The receiver circuit provides a first data signal and a primary phase data according to a received signal. The control module provides a phase offset data and a level offset data. The level adjust circuit adjusts a level of the received signal in respond to the level offset data; the phase interpolator triggers according to a sum of the phase offset data and the primary phase data, so a second data signal is provide in response to the level-adjusted received signal. The control module compares the first data signal and the second data signal, and accordingly provides an eye diagram scan result for the phase offset data and the level offset data.

Abstract: Systems and methods for measuring transmitter and/or receiver I/Q impairments are disclosed, including iterative methods for measuring transmitter I/Q impairments using shared local oscillators, iterative methods for measuring transmitter I/Q impairments using intentionally-offset local oscillators, and methods for measuring receiver I/Q impairments. Also disclosed are methods for computing I/Q impairments from a sampled complex signal, methods for computing DC properties of a signal path between the transmitter and receiver, and methods for transforming I/Q impairments through a linear system.

Abstract: A test system for diagnosing twisted pair wiring includes a system processor in communication with a subscriber line interface module, which includes a codec and a SLIC (Subscriber Line Interface Circuit). The SLIC transmits a waveform having a frequency used for voice or baseband modem transmissions onto the twisted pair wiring. The system processor transmits a digital PCM (Pulse Code Modulation) stream to the codec, and the codec converts the digital PCM stream into the waveform transmitted onto the twisted pair wiring. In response to the transmitted waveform, the SLIC senses current on the twisted pair wiring. The codec generates an output waveform corresponding to the sensed current. The system processor receives the output waveform from the codec as a digital PCM stream, synchronizes the transmitted waveform and the output waveform at a single sample, and determines electrical properties of the twisted pair wiring from the output waveform.

Abstract: A calibration method for calibrating a communication system includes: generating a test signal at a transmitter; configuring at least one calibration coefficient at the transmitter; configuring at least one calibration coefficient at the receiver; transmitting the test signal to a receiver via the calibration coefficient; performing a spectrum analysis upon the test signal received by the receiver to generate a spectrum analysis result; and adjusting the calibration coefficient according to the spectrum analysis result to calibrate the transmitter. In addition, a calibration method is also provided for calibrating a receiver of a communication system, and related calibration apparatuses are further provided.

Abstract: A transmitter comprises a baseband signal path, which is designed to provide a first baseband signal having an in-phase component and a quadrature component in a first mode of the transmitter and to provide a second baseband signal having an amplitude component and a phase component in a second mode of the transmitter; an oscillator circuit, which is designed to provide an oscillator signal, wherein the oscillator circuit is furthermore designed to provide the oscillator signal as an unmodulated signal in the first mode and to provide the oscillator signal as a modulated signal in the second mode, wherein a modulation of the oscillator signal in the second mode is based on the phase component of the second baseband signal; and a radio-frequency digital-to-analogue converter (RF-DAC), which is designed to receive the oscillator signal, the first baseband signal and the amplitude component of the second baseband signal, wherein the RF-DAC is furthermore designed to provide the vector-modulated RF output signal

Abstract: In general, techniques are described for sensing wireless communications in television frequency bands, which may be implemented by a sensing device comprising a sensing unit, a power spectral density (PSD) estimation unit, a filter unit, a candidate selection unit, an analysis unit and a decision unit. The sensing unit senses a signal in the television frequencies bands. The PSD estimation unit calculates an estimate of a PSD for the sensed signal. The filter unit filters the estimated PSD. The candidate selection unit analyzes the filtered PSD to identify a candidate frequency representative of a potentially in use frequency. The analysis unit computes a test statistic for the candidate frequency. The decision unit compares the test statistic to a threshold to identify whether the candidate frequencies is actively in use by wireless communication devices.

Abstract: A receiver circuit includes an estimation unit configured to estimate a noise power of a transmission channel, a calculation unit configured to calculate a decision variable based on the noise power, and a decision unit configured to make a ternary decision based on the decision variable.

Abstract: A patient medical signal processing system adaptively reconstructs a medical signal sampled using a varying sampling rate. The system includes an input processor and a signal processor. The input processor receives first data and second data. The first data represents a first portion of a medical signal derived by sampling at a first sampling rate and the second data represents a second portion of the medical signal derived by sampling at a second sampling rate. The first and the second sampling rates are different and comprise a master clock rate or an integer division of the master clock rate. A signal processor provides a reconstructed sampled medical signal by, interpolating the second data to provide third data at the first sampling rate and combining the first data and the third data to provide the reconstructed sampled medical signal.

Abstract: An apparatus and method for receiving a signal waveform representing a signal-under-test (SUT), and a noise waveform representing noise measured in the absence of the SUT. An environment waveform is derived from the noise waveform and the signal waveform, and a jitter spectrum is computed from the environment waveform. An environment spur is detected, where the environment spur includes a spur in the jitter spectrum of the environment waveform. A jitter spectrum of the signal waveform is computed, and one or more signal spurs are detected, where the one or more signal spurs include one or more spurs in the jitter spectrum of the signal waveform. A measure of jitter for the SUT is derived from the one or more signal spurs after reducing the presence of at least one of the one or more signal spurs in response to detecting the environment spur.

Abstract: A device and method of re-sampling a plurality of S-parameters for serial data link analysis is disclosed. The method includes storing a plurality of S-parameters sets, each S-parameter set being associated with a subsystem and having associated impulse responses and a time interval. An increased time interval is determined based on the time interval associated with each S-parameter set. The impulse responses are zero filled in each S-parameter set to maintain any wrapped ripples and increase the time interval. A plurality of resampled S-parameter sets are generated with a finer frequency resolution to cover the increased time interval.

Abstract: A communication device operating in time division duplex (TDD) mode using multiple antennas is provided herein. The communication device uses receive channel estimation measurements to perform transmit beamforming and multiple input multiple output (MIMO) transmission, based on self-calibration of the various up/down paths via a method of transmission and reception between its own antennas, thus achieving reciprocity mapping between up and down links. Either user equipment (UE) or a base station may routinely perform this self-calibration to obtain the most current correction factor for the channel reciprocity to reflect the most current operating conditions present during TDD MIMO operation.

Abstract: A method and apparatus for allocating transmission power in a transmission terminal having at least one antenna of a multi-input multi-output (MIMO) system are provided. The method includes: measuring inter-stream interference of a plurality of streams; measuring inter-user interference of a plurality of users; and determining the transmission power based on the inter-stream interference and the inter-user interference, wherein the transmission power is determined using an iterative water-filling algorithm in which the Karush-Kuhn-Tucker (KKT) system is iteratively applied to all of the plurality of streams and all of the plurality of users. According to the present invention, several receive antennas are mounted in the MIMO system, thereby making it possible to receive multiple streams. In addition, when the multiple streams are received, transmission power may be allocated to each transmission stream.

Abstract: A method of changing an operating performance point of an integrated circuit including detecting a need to change the operating performance point of the integrated circuit to a new operating performance point. The method also includes changing a voltage of the integrated circuit to correspond with the new operating performance point, changing a maximal receiver clock frequency value to correspond with the new operating performance point, exporting the maximal receiver clock frequency value to a distant integrated circuit, and receiving an acknowledgement of the changed maximal receiver clock frequency value from the distant integrated circuit.

Abstract: A method includes computing a minimum sensitivity threshold value for a particular wireless device, configuring the particular wireless device to receive wireless signals with a signal strength higher than the minimum sensitivity threshold value, distributing the minimum sensitivity threshold value to other wireless devices, and configuring the other wireless devices based on the minimum sensitivity threshold value for the particular wireless device.

Abstract: A device is provided for use of an antennal base formed of two antennas which pick up the emissions present and produce two radioelectric signals S1 and S2. These two signals are used to produce at least one intermediate-frequency signal Fl by demodulation of one of the two signals by the other (autotransposition). The demodulation is carried out by firstly transposing one of the signals, S1 for example, around a given frequency F1, the signal S2 being preserved around its initial central frequency F0. Thus, whatever the central frequency F0 of the emission picked up by the antennas, the demodulation produces a signal of central frequency F1, thereafter demodulated into a given intermediate frequency Fl by a local oscillator of constant frequency F2=F1+Fl. The device is applied to the production of a device for detecting emissions and for characterizing the emissions picked up.

Abstract: The present subject matter discloses a system and a method for processing of channel coefficients of networks. In one embodiment, the method includes ascertaining at least one probable synchronization position of a received sequence and projecting, by oblique projection, at least one given noise basis vector spanning a given noise space onto the null space, so as to determine a channel impulse response at the at least one probable synchronization position. Based on a criterion related to the channel impulse response, a synchronization point for the received sequence is identified from the at least one probable synchronization position. The method also includes determining the noise contribution at the synchronization point and determining the noise coefficient of the at least one given noise basis vector based on the noise contribution so as to recover a signal substantially similar to the originally transmitted signal.

Abstract: An equalization adaptation circuit comprises an equalizer, a transition determination circuit, a phase error circuit, a sequence recovery circuit, a phase error accumulator circuit, a transition accumulator circuit, and a controller circuit. The equalizer has adjustable parameters. The transition determination circuit determines observed transitions in an equalized signal output from the equalizer. A phase error circuit determines phase errors of the observed transitions. A sequence recovery circuit generates recovered digital data sequences. A phase error accumulator circuit accumulates the phase errors in respective association with pre-defined patterns matching the recovered digital data sequences containing observed transitions corresponding to the phase errors. A transition accumulator circuit accumulates a number of the observed transitions. A controller circuit controls the adjustable parameters of the equalizer based upon the accumulated phase errors and number of observed transitions.

Abstract: A diagnostic data acquisition system for analyzing impairments in a QAM digital communication system is triggered by diagnostic data generated by a QAM demodulator when demodulating a QAM signal. Upon triggering, the data acquisition system can capture the diagnostic data used for triggering, and/or some other diagnostic data. The captured data may be stored for subsequent analysis to determine a probable cause of the impairment.

Abstract: A transmission characteristic adjustment device includes: a setting process portion that sets a setting value concerning each transmission characteristic of a plurality of electric signals to at least one of a sending device that sends the plurality of electric signals and a receiving device that receives the plurality of electric signals; a generation process portion that acquires each error rate calculated based on identification information included in each of the plurality of electric signals whenever the setting value is changed, and generates a table on which a plurality of sets of the setting value and the error rate are recorded; and an adjustment process portion that adjusts the setting value based on the table.

Abstract: The present invention relates to an overpower detection device 51 capable of detecting, with a simple configuration, overpower of a circuit that processes a signal associated with instantaneous variation. The overpower detection device 51 of the present invention includes: a power information acquisition section 61 for acquiring an index value of power, at each timing, of a signal transmitted or received in a target device; a comparison section 62 for comparing the index value acquired by the power information acquisition section 61 with an evaluation threshold; a comparison result accumulation section 63 for accumulating a value indicating a comparison result of the comparison section 62 at the each timing; and an overpower determination section 64 for determining overpower of a circuit in the target device, based on an accumulation result of the comparison result accumulation section 63.

Abstract: A built-in receiver self-test system provides on-chip testing with minimal change to the receiver footprint. The system digitally generates a two-tone test signal, and tests the nonlinearities of the receiver using the generated two-tone test signal. To that end, the self-test system comprises a stimulus generator, a downconverter, and a demodulator, all of which are disposed on a common receiver chip. The stimulus generator generates a test signal comprising first and second tones at respective first and second frequencies, where the first and second frequencies are spaced by an offset frequency, and where the first frequency comprises a non-integer multiple of the offset frequency. The downcoverter downconverts the test signal to generate an In-phase component and a Quadrature component. The demodulator measures an amplitude of the intermodulation tone by demodulating the In-phase and Quadrature components based on a reference frequency.

Abstract: Disclosed are a signal compression apparatus and method for dynamic compressive sensing, including: a signal input unit configured to simultaneously output an input signal, and generate and output a linear measurement reference signal based on the input signal; a linear transform unit configured to receive the linear measurement reference signal and variably generate a linear measurement matrix value according to the linear measurement reference signal; a signal compressor configured to output a compressed signal for the input signal based on the generated linear measurement matrix value; and a signal processor configured to reconstruct the compressed signal and perform spectrum sensing of the input signal.

Abstract: In a multiple interface, low power and lossy network comprising a plurality of nodes, a sender node dynamically selects a data packet for setting a transmission parameter request in response to determining that an age value for a set of transmission parameters associated with a recipient device has expired or is expiring. The sender node selects an desired data packet for sending a transmission parameter request and transmits the selected data packet to the recipient device. The sender node receives a transmission parameter response from the recipient node comprising updated transmission parameters for that recipient node and then updates the current transmission parameters associated with the recipient node accordingly.

Abstract: A simulated radio channel is shifted with respect to a plurality of antenna elements coupled with an emulator for communicating with a device under test by using different directions for the simulated radio channel in an anechoic chamber.

Abstract: A signal testing apparatus is provided. The signal testing apparatus generally comprises a recording device that is configured to receive a plurality of signals representative of a plurality of electromagnetic waves that correspond to a pre-defined period of time. The recording device is further configured to record a plurality of digital representations of the signals such that each digital representation corresponds to a separate signal. A processing device is coupled to the recording device, wherein the processing device is configured to introduce at least one operational parameter to each of the digital representations. A play-back assembly is coupled to the recording device and to the processing device, wherein the play-back device is configured to play each of the digital representations simultaneously in real-time to facilitate verification of each of the signals.

Abstract: A control/monitor signal transmission system that employs a transmission synchronization scheme in which a master station connected to a single control unit and a plurality of slave stations corresponding to a plurality of controlled apparatuses synchronize with each other through a transmission clock and data is transmitted therebetween over a common data signal line, a transmission line disconnection detection method that enables a disconnection of a transmission line to be detected precisely; and a slave station that is used for this method. A continuous pulse signal that the master station outputs to the common data signal line is provided with a management data region that includes a plurality of pulse signals and that differs from a control/monitor data region including data of a control data signal and data of a monitor data signal.

Abstract: Systems, methods, and apparatus are provided for device sensing in white space, by identifying sources of signal emission by automatically detecting signals, analyzing signals, comparing signal data to historical and reference data, and creating corresponding unique signal profiles.

Abstract: Among other things, a method is described for the configuration of a communication device (10) as well as a communication device (10). In this method, a communication link (20) is created from the communication device (10) to an external configuration computer unit (30) and identification data (100), which are related to the communication device (10), are transmitted from the communication device (10) to the external configuration computer unit (30) for the purpose of authentication of the communication device (10), with chip card-related identification features (111) being transmitted as identification data (100), with the chip card-related identification features (111) being assigned to a chip card (11) for the identification thereof, and with the chip card (11) being assigned to the communication device (10), and, when authentication is successful, a configuration of the communication device (10) is carried out.

Abstract: Systems, methods, and apparatus for generating data packets and testing a packet switching system are provided. For example, a data packet diagnostic system includes an input queuing subsystem comprising a set of data queues, an injecting unit, and a diagnostic unit. Each data queue is coupled with a separate functional read/write path and debug read/write path. The injecting unit injects test data packets into at least one of the data queues via its respective debug read/write path. The test packets can then be processed (e.g., routed) through a data packet processing environment. In some implementations, packets are communicated via the data packet processing environment back to the input queuing subsystem, where the diagnostic unit can read present contents of at least one of the data queues to determine whether the present contents satisfy a predetermined test profile according to the injected data packets.

Abstract: Provided herein are methods and systems that provide automatic compensation for frequency attenuation of a video signal transmitted over a cable. In accordance with an embodiment, a system includes an equalizer and a compensation controller. The equalizer receives a video signal that was transmitted over a cable, provides compensation for frequency attenuation that occurred during the transmission over the cable, and outputs a compensated video signal. The compensation controller automatically adjusts the compensation provided by the equalizer based on comparisons of one or more portions of the compensated video signal to one or more reference voltage levels. One or more values indicative of one or more levels of compensation provided by the equalizer are stored in memory and/or registers for each time, of a plurality of times. A monitor monitors for changes in the cable and/or the video signal transmitted over the cable based on the stored values.

Abstract: Described are methods of determining imbalance in an IQ modulator. Example methods include applying a set of at least three test signals to the I channel and Q channel to generate an output, then receiving output from a frequency measuring device coupled to the IQ modulator. Some of the set of test signals may be substantially different than other test signals in the set. After the frequency specific output is received, the method measures one or more values and derives the imbalance in the IQ modulator from the measured values. Embodiments also include adjusting parameters of the test signals until a minimum distance is measured. A device is also described, which includes a test signal generator, an output analyzer, and a minimizer structured to cause the test signal generator to generate a set of test signals that cause a distance measured in the output to be a minimum distance.

Abstract: The first and second outputs of a signal generation system are coupled to the first and second inputs of a signal digitizing system via respective electrical conductors. A controller directs the generation system to generate a first calibration signal, and the digitizing system responsively captures a first set of vector samples. The conductors are then reconfigured so they connect the first and second outputs of the generation system respectively to the second and first inputs of the digitization system. The controller then directs the generation system to generate a second calibration signal, and the digitizing system responsively captures a second set of vector samples. The controller or other processing agent computes gain and/or phase impairments using the first and second vector sample sets. Digital filter parameters may be computed based on the computed impairment(s), and used to correct the impairment(s) of the generation system and/or the digitizing system.

Abstract: Disclosed in the present invention is a vector signal analyzer, which relates to communication technology. The vector signal analyzer comprises: a radio frequency front end splitting module, for splitting the received signals to at least, two signals; an analog signal processing module, for performing radio frequency/micro wave processing and analog-digital conversion for each signal separately; a digital signal processing module, fir performing spectrum analyze and signal demodulation analyze separately for each digital signals, which are outputted from the analog signal processing module.