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| Number | Title | Issue Date |
| 8102903 | Calibrating received signal measurements in a digital subscriber line device Methods and apparatus for calibrating received signal measurements in a digital subscriber line (DSL) device are disclosed. In an exemplary method, a received signal level is measured for each of one or more subcarriers of a digital subscriber line signal and conver... | 01/24/2012 |
| 8098720 | Method and apparatus for suppressing adjacent channel interference and multipath propagation signals and radio receiver using said apparatus A method detects multipath propagation in a modulated digital signal. The method provides a first value of channel frequency, representing the modulated digital signal free of multipath propagation, providing a second value of said channel frequency, representing th... | 01/17/2012 |
| 8094704 | Detecting wireless channel status from acoustic discrimination of spectral content Systems and methods of detecting wireless channel status from acoustic discrimination of spectral content are described. In one aspect, a wireless system includes a spectrum analyzer, a detector, and a controller. The spectrum analyzer is operable to acoustically di... | 01/10/2012 |
| 8094705 | Fast SERDES I/O characterization A system and method to perform automatic testing of a device using Design-for-Test functionality built-in a pair of serializer/deserializer (SERDES) of the device to perform I/O characterization with respect to clock jitter in a self-test mode. Performance of a SERD... | 01/10/2012 |
| 8090009 | Test apparatus A test apparatus includes a transmitting-side jitter measuring unit which measures a jitter of a transmission signal output from a transmitting circuit, a jitter applying unit which applies a jitter to the transmission signal and inputs the signal to a receiving cir... | 01/03/2012 |
| 8081674 | Methods and system for determining a dominant impairment of an impaired communication channel Methods are described for identifying a dominant impairment on a communication channel impaired by an interference issue. The methods include systematic examination of total power loading, systematic examination of signal power reduction, statistical examination of ... | 12/20/2011 |
| 8073042 | Recursive range controller A method and apparatus for detecting out-of-specification data streams and voltage controller oscillator operation. Data may be received over evaluation periods. Each evaluation period is segmented into n sub-periods. Each n sub-period has the same length. Each n su... | 12/06/2011 |
| 8064506 | Signal generator and user interface for setting test sequences and parameters of a test signal A signal generator generates a WiMedia ultra wideband test signal with a user interface for setting test sequences and parameters of the test signal. Parameters are set for Presentation Protocol Data Units associated with Packet Groups of the test signal. A signal p... | 11/22/2011 |
| 8064507 | System and method for channel estimation A method and apparatus in a multiple sub-carrier digital communication receiver that estimates a communication channel. A second set of channel estimates are generated based on a Wiener filter interpolation of a first set of channel estimates. Pre-determined transmi... | 11/22/2011 |
| 8045604 | Estimation of log-likelihood using constrained markov-chain monte carlo simulation Log likelihood ratios for data bits transmitted in a multi-dimensional signal are estimated using multiple Markov chain Monte Carlo simulations (MCMC). The MCMC simulations can include constraining symbols based on a most-likely symbol to improve the likelihood of f... | 10/25/2011 |
| 8040941 | Constellation-multiplexed transmitter and receiver A device of dynamic communication of information allows, on the average, non-integer bits per symbol transmission, using a compact code set or a partial response decoding receiver. A stream of selectable predetermined integer bits, e.g., k or k+1 data bits, is group... | 10/18/2011 |
| 8027378 | Circuits, architectures, apparatuses, systems, algorithms and methods and software for amplitude drop detection Methods, circuits, systems, and networks for detecting an amplitude drop in an incoming signal. The methods generally comprise sampling the incoming signal at regular intervals to produce a plurality of sample values, producing a plurality of drop flags in response ... | 09/27/2011 |
| 8023558 | Method and apparatus for measuring the input frequency response of a digital receiver A frequency response measurement circuit includes a generation circuit operative to provide an input signal having a voltage and programmable frequency characteristics in response to a frequency control signal. A decision circuit is coupled to the generation circuit... | 09/20/2011 |
| 8018989 | System and method for adjusting a serial communications link A system for adjusting a serial communications link includes a system under test including at least one transmitter and at least one receiver coupled together via a serial data communications link, wherein at least one of the transmitter and the receiver has at leas... | 09/13/2011 |
| 8005132 | Non-intrusive modem performance analysis A method of analyzing the performance of a modem connection. The method includes connecting a line interface to a communication link carrying signals of a modem connection, between a pair of end modems, collecting signals passing on the communication link, between t... | 08/23/2011 |
| 7995645 | Apparatus for measuring in-phase and quadrature (IQ) imbalance The present general inventive concept relates to apparatuses and/or methods for measuring an in-phase and quadrature (IQ) imbalance. In one embodiment, a signal generator can provide a first IQ signal of a DC component during a first period and the first IQ signal o... | 08/09/2011 |
| 7983331 | Method to detect missing filter/splitter and apparatus for performing such a method A method to detect a defective or missing filter at a customer's side between a first connection having a first frequency spectrum and a second connection having a second frequency spectrum and using the same physical transmission medium as the first connection betw... | 07/19/2011 |
| 7978754 | Communication channel calibration with nonvolatile parameter store for recovery A communication channel is operated by storing a calibrated parameter value in nonvolatile memory during manufacturing, testing, or during a first operation of the device. Upon starting operation of the communication channel in the field, the calibrated parameter va... | 07/12/2011 |
| 7978755 | Methods and systems for detecting defects in serial link transceivers Methods and systems for detecting defects in serial link transceivers. Defect detection includes detecting open circuits in one or more of the transmission lines, detecting short circuits between one or more of the transmission lines and a power supply, detecting sh... | 07/12/2011 |
| 7970045 | Method and device for adapting a signal A method and device for adapting a signal is provided. The signal includes a number of recurring samples of data. In one example embodiment, the method receives recurring samples of data. Each of the samples of data includes a first number of elements. A second numb... | 06/28/2011 |
| 7961777 | Signal processing apparatus, signal processing method, and program A signal processing apparatus configured to process a signal transmitted via a transmission path where a waveform represented by a signal value of a particular symbol is stationarily distorted in accordance with values of symbols transmitted prior to the particular ... | 06/14/2011 |
| 7957459 | Symbol rate testing method based on signal waveform analysis A symbol rate testing method based on signal waveform analysis is provided. A signal with a plurality of quasi bits 1 and a plurality of quasi bits 0 is received and sampled within an acquiring time. Maximum values of the quasi bits 1 are obtain... | 06/07/2011 |
| 7957460 | Method of and a device for generating a signal having a predetermined quality criterion for use in or on a communication system There is disclosed a signal having a predefined quality criterion for use with a communication systems, a method of and a system for generating, such a signal, a method of testing the operation of a communication system using such a signal and a (tele)communication ... | 06/07/2011 |
| 7957458 | Jitter measurement apparatus, jitter measurement method, test apparatus and electronic device A jitter measuring apparatus measures timing jitter of a signal-under-test. The jitter measuring apparatus includes a pulse generator for outputting a pulse signal of a predetermined pulse width for an edge of the signal-under-test, and a jitter measuring sub-unit f... | 06/07/2011 |
| 7949039 | Home network testing A home network testing device includes an input port with any one or more of a variety of different connectors for receiving different types of communication cables, e.g. coaxial cable, telephone cable, and electrical cable; and a testing apparatus section with a va... | 05/24/2011 |
| 7916778 | Constructing an energy matrix of a radio signal A method analyzes a radio signal received via a wireless channel. The radio signal includes multiple frames representing a transmitted symbol. Energy of each frame is sampled during multiple of non-overlapping time windows. The sampled energies are stored in an ener... | 03/29/2011 |
| 7856050 | Receiver and transmitter calibration to compensate for frequency dependent I/Q imbalance A receiver, which is adapted for demodulating signal carriers at variable frequencies to provide received signals at a plurality of different received frequencies, is calibrated to compensate for a frequency-dependent imbalance in the amplitude and/or the quadrature... | 12/21/2010 |
| 7852911 | Method and arrangement for channel simulation A method and arrangement for simulating a radio channel. In the solution, a channel having paths is simulated and the delay of each path is formed separately with a low-resolution delay arrangement and a high-resolution delay arrangement in such a manner that the si... | 12/14/2010 |
| 7843991 | Methods and apparatus for monitoring voice quality on a wireless communication device Methods and apparatus for providing monitoring of voice quality and diagnostic data related to voice quality on a wireless device. Monitoring thresholds can be implemented that allow for additional precautionary measures and/or further monitoring to occur if a thres... | 11/30/2010 |
| 7835432 | Measuring noise power at wireless receivers using pilot symbol information Embodiments are directed to a wireless receiver system that utilizes a special structure of pilot symbols used for synchronization and channel estimation in transmission packets to measure noise power at the receiver. The periodicity of the pilot signal sequences is... | 11/16/2010 |
| 7822110 | Eye diagram determination during system operation A system for testing a communications link. A system includes a transmitter, a receiver, a digital communications link, and a service processor. The digital communications link includes a plurality of lanes through which the transmitter is coupled to the receiver. D... | 10/26/2010 |
| 7809051 | Method to perform a statistical test in which the experiment is multinomial A method for performing a statistical test on a device or radio channel, which has N outcomes in the form of N different events, whereby N is higher than two, with the following steps: measuring ns samples of the output of the devi... | 10/05/2010 |
| 7804889 | Channel estimation method and apparatus using linear interpolation scheme in orthogonal frequency division multiplexing system and receiver using the same Disclosed are a channel estimation method and a channel estimation apparatus, and a receiver using the same. The channel estimation apparatus provided in the receiver detects pilot signals from radio signals and estimates channels of the detected pilot signals. The ... | 09/28/2010 |
| 7796686 | Adaptive ultrawideband receiver and method of use In accordance with the present invention, novel methods for adaptive receiver design and related parameter estimation techniques for efficient and non-coherent reception of ultrawideband signals are presented. Efficient estimation of maximum excess delay of the chan... | 09/14/2010 |
| 7792181 | Linearity evaluation method using integrations weighted by probability density function, and circuit simulator, evaluation device, communication circuit, and program using the method An evaluation method for linearity evaluations neither performing calculations of error vectors at multiple sampling points nor using a demodulator corresponding to a desired modulation scheme. Measuring devices (164 and 165) measure the input signal a... | 09/07/2010 |
| 7782932 | Circuit and method for evaluating the performance of an adaptive decision feedback equalizer-based serializer deserializer and serdes incorporating the same A circuit and method for evaluating serializer deserializer (SERDES) performance that is particularly advantageous when the SERDES has a decision feedback equalizer (DFE). In one embodiment, the circuit has a data processing path and an operational feedback loop cou... | 08/24/2010 |
| 7782933 | Digital subscriber line diagnostic system A communication device transmits very low frequency signals in order to help diagnose the cause of a communication problem in a DSL communication system. The communication problem may be, for example, the inability of a remote data transceiver unit (DTU-R) to succes... | 08/24/2010 |
| 7778318 | OFDM gain compression measurement A method for measuring amplifier gain compression in an OFDM signal includes measuring the signal as a function of time to provide an observed time magnitude, demodulating the OFDM signal to determine an estimate of the ideal signal constellation points, performing ... | 08/17/2010 |
| 7778317 | Method and device for detecting inductive elements in a communication line A method for detecting inductive elements in a communication line, including the processes of: inputting a detecting signal to an end of the communication line; sampling the time domain voltage vector of one end of the communication line; generating the amplitude-fr... | 08/17/2010 |
| 7778316 | Detecting channel impulse magnitude response in digital communication systems A system and method of detecting the location and magnitude of multi-path echoes in a channel impulse response by going through the channel impulse magnitude response only once and detecting all the multi-path echoes, both location and magnitude, according to certai... | 08/17/2010 |
