Signal Noise Patents (Class 375/227)
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Patent number: 7978756Abstract: Systems and methods for monitoring impulse noise are described. At least one embodiment is a method, which comprises detecting whether impulse noise is present and in response to detecting the presence of impulse noise, performing time domain analysis to determine whether one or more impulse noise sources are present based on minimum interarrival time and maximum impulse length. The method further includes performing frequency domain analysis to estimate frequencies associated with the one or more impulse noise sources and based on the time domain analysis and frequency domain analysis, providing a total number of impulse noise sources and frequencies associated with the impulse noise sources. In this regard, the embodiments described herein provide dual-speed monitoring of impulse noise in the form of short-term and long-term monitoring.Type: GrantFiled: April 7, 2008Date of Patent: July 12, 2011Assignee: Ikanos Communications, Inc.Inventors: Hemant Samdani, Kunal Raheja, Rahul Garg, Patrick Duvaut, Amitkumar Mahadevan, Robert A. Day, Robin Levonas
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Publication number: 20110164669Abstract: Various embodiments of the present invention provide systems and methods for estimating noise components in a received signal set. For example, one embodiment of the present invention provides a noise estimation circuit that includes a data detector circuit and a noise component calculation circuit. The data detector circuit receives a series of data samples and provides a detected output, and the noise component calculation circuit provides an electronics noise power output and a media noise power output each calculated based at least in part on the detected output and the series of data samples.Type: ApplicationFiled: January 5, 2010Publication date: July 7, 2011Inventors: George Mathew, Shaohua Yang, Yuan Xing Lee, Hongwei Song
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Publication number: 20110164670Abstract: The present invention relates to a communication system comprising a transmitter and receiver in communication for transmitting signals through one or more communications channels, wherein at least one of the transmitter and the receiver each comprise a quality measure, which contributes to an overall quality measure for the system and wherein the or each communications channel comprises a plurality of sub-bands between at least two nodes, wherein the plurality of sub-bands each having a specific maximum power spectral densities (PSDs) and wherein one or more sub-bands between the transmitter and the receiver are identified as having a higher maximum PSD than other sub-bandsand wherein the PSD of the one or more identified sub-bands is reduced in a predetermined manner to thereby increase the overall quality measure for the system.Type: ApplicationFiled: June 12, 2009Publication date: July 7, 2011Inventors: Jose Abad Molina, Jonathan Ephraim David Hurwitz
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Publication number: 20110158305Abstract: Aspect of the invention relate to a method for reporting channel quality information from a user equipment (UE) to a base station. In some embodiments, the method includes: determining a first channel quality value (CQ1) for a first channel; reporting channel quality for the first channel, wherein the step of reporting channel quality for the first channel comprises transmitting from the UE to the base station a first channel quality indicator value (CQI1) consisting of n bits; determining a second channel quality value (CQ2) for a second channel; after determining CQ2, calculating a value of X, wherein X equals (i) DeltaCQ+an offset parameter value (P) or (ii) DeltaCQ?P, wherein P does not equal zero, and DeltaCQ equals (i) CQ1?CQ2, (ii) CQ2?CQ1, (iii) CQI1?CQI2 or (iv) CQI2?CQI1, wherein CQ12 is a function of CQ2; and after calculating X, reporting channel quality for the second channel by transmitting from the UE to the base station an m bit value X?, wherein X? is a function of X and m<n.Type: ApplicationFiled: September 4, 2008Publication date: June 30, 2011Applicant: TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)Inventor: Bo Göransson
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Publication number: 20110158304Abstract: Techniques are described that provide uplink power control techniques that can support different uplink multi-input multi-output (MIMO) transmission schemes. A mobile station determines a Signal to Interference-plus-Noise Ratio based on base and offset values transmitted from a base station. The base station can transmit the base and offset values using seven bits total. The mobile station determines an uplink transmitter power level based on the Signal to Interference-plus-Noise Ratio.Type: ApplicationFiled: May 19, 2010Publication date: June 30, 2011Inventor: Rongzhen Yang
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Publication number: 20110150067Abstract: In an echo canceller, a specific frequency component eliminator eliminates a specific frequency component of a specific frequency from a receiver signal to output a resultant signal to an echo path. A specific frequency component detector detects a frequency component of the same frequency as the specific frequency eliminated by the specific frequency component eliminator from the transmitter signal. A noise calculator finds noise power on the basis of power of the specific frequency component detected by the specific frequency component detector, and finds total power including noise and an echo component on the basis of power of a frequency component including the echo component. A control parameter calculator uses the noise power and the total power found by the noise calculator to find a control parameter of the echo canceller.Type: ApplicationFiled: December 16, 2010Publication date: June 23, 2011Applicant: OKI ELECTRIC INDUSTRY CO., LTD.Inventor: Masashi Takada
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Patent number: 7965787Abstract: Methods and systems of receiving wireless signals are disclosed. One method includes a receiver characterizing signal quality parameters of receive signals for a plurality of receive diversity settings. The receiver selects a first receive diversity setting for synchronizing the receiver with the receive signal based on the characterized signal quality parameters. The receiver selects a second receive diversity setting for receiving data with the receive signal based on the characterized signal quality parameters.Type: GrantFiled: July 10, 2008Date of Patent: June 21, 2011Assignee: NDSSI Holdings, LLCInventor: Sujai Chari
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Publication number: 20110142116Abstract: A method and apparatus for estimating a channel parameter in a multi-antenna system is provided. The method of estimating a channel parameter includes selecting at least a part of received data as an effective segment based on power of the received data, and estimating a channel parameter by applying a channel estimation algorithm to received data within the selected effective segment. Accordingly, it is possible to reduce the amount of calculation by removing noise signals from received data and measuring channels using signals within an effective signal segment when the channel parameters are estimated.Type: ApplicationFiled: July 29, 2010Publication date: June 16, 2011Applicant: Electronics and Telecommunications Research InstituteInventors: Jae-Joon Park, Myung-Don Kim, Hyun-Kyu Chung
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Publication number: 20110142117Abstract: A signal detecting method and device for a multi-codeword multi-input multi-output (MIMO) system are provided, which are used in the field of communication and solve the problem that it is complex to implement a signal detecting method in the multi-codeword MIMO system and the error between the signal obtained through detection and the signal actually transmitted from the transmitting end is large. The method includes: converting a received complex number signal into a real number signal; performing channel estimation to obtain a channel matrix; correcting the channel matrix to obtain an equivalent corrected matrix; generating an equivalent detecting signal according to the equivalent corrected matrix and the real number signal obtained through conversion; quantizing the equivalent detecting signal to obtain an equivalent quantized detecting signal; and generating a signal transmitted from a transmitting end according to the equivalent quantized detecting signal.Type: ApplicationFiled: December 30, 2010Publication date: June 16, 2011Applicant: HUAWEI TECHNOLOGIES CO., LTD.Inventors: Meng HUA, Gengshi Wu, Chunling Zhang, Shurong Jiao
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Publication number: 20110142115Abstract: Methods, apparatuses, and computer program products are disclosed for performing a Doppler spread estimation. In a first embodiment, an energy associated with a communication from a wireless terminal is ascertained based on at least one pilot symbol and at least one data symbol. Each of an energy variance and a noise variance are then determined to facilitate estimating a speed of the wireless terminal based on the energy variance normalized by the noise variance. In another embodiment, a signal received from a wireless terminal is decoded and replicated. A channel estimate associated with a set of data symbols is then ascertained from the replica, which is used to estimate the speed of the wireless terminal.Type: ApplicationFiled: June 17, 2010Publication date: June 16, 2011Applicant: QUALCOMM INCORPORATEDInventors: Renqiu Wang, Hao Xu
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Patent number: 7961779Abstract: Provided is a method and system for noise-driven recovery of a digital pulse stream. The method includes receiving initial parameters including the base characteristics of a pulse signal, the characteristics including the minimum pulse interval. An incoming analog signal is converted to a digital signal and sampled a predetermined number of times at intervals less than the minimum pulse interval to record a set of minimum signal values. The incoming signal is also sampled a predetermined number of times at intervals less than the minimum pulse interval to record a set of maximum signal values. At least the first greatest value from the set of maximum signal values is discarded. Each set is averaged to provide an average minimum value and an average maximum value. Based on these values at least one threshold value is then determined, and the digital pulse stream is identified based on the threshold values.Type: GrantFiled: December 19, 2005Date of Patent: June 14, 2011Assignee: L-3 Integrated Systems CompanyInventor: Jerry W. Yancey
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Publication number: 20110131615Abstract: A source-channel combined coding method including: determining whether a channel signal-to-noise ratio (SNR) is varied or not; when it is determined that the channel SNR is varied, selecting a MODCOD suitable for the channel SNR by referring to a first table defining an SNR threshold value at which data transmission is performed without an error, for each MODCOD designating a low density parity check (LDPC) code rate and a modulation scheme; calculating a source coding rate by using an effective information bit rate of the selected MODCOD; extracting network abstraction layer (NAL) units for each layer from an inputted video frame so as to satisfy the calculated source coding rate, and packetizing the extracted NAL units; binding packets to configure a baseband (BB) frame; and LDPC coding and modulating the BB frame through the code rate and the modulation scheme which are designated by the selected MODCOD.Type: ApplicationFiled: November 30, 2010Publication date: June 2, 2011Applicant: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTEInventors: In Ki LEE, Dae Ig Chang, Kwang Deok Seo, Won Sup Chi
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Publication number: 20110129009Abstract: Aspects of the present disclosure describe an efficient channel estimation algorithm for high-speed processing of dedicated reference signals. The channel estimation algorithm may utilize one or more compressed interpolation matrices. The compressed interpolation matrices may be selected based on the Doppler value and signal to noise ratio (SNR) of the channel.Type: ApplicationFiled: November 29, 2010Publication date: June 2, 2011Applicant: QUALCOMM IncorporatedInventors: Dung Ngoc Doan, Tao Luo, Taesang Yoo, Yongbin Wei, Xiaoxia Zhang
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Patent number: 7953144Abstract: A method halts transmission and/or reception of a desired signal on a channel in a communication network and samples an analog metric versus time on the channel at a predetermined sample rate. Successively sampled sets of data are stored first to a one dimensional array, each of which set is then stored to a two-dimensional array. The two dimensional array is analyzed in the time domain to determine the presence of impulse noise. Analog parameters represented by values contained in the samples can be analyzed to determine where, with respect to time, impulse noise occurs, and what is the amplitude of the impulse noise as well as AWGN.Type: GrantFiled: September 25, 2007Date of Patent: May 31, 2011Assignee: ARRIS Group, Inc.Inventors: Jim Allen, Tom Cloonan
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Patent number: 7953183Abstract: A system for blending a hybrid radio signal provides reduced volume level transitions during blending from an analog component of the hybrid signal to the digital component by adjusting blend and cross-fade variables, as well as setting a hysteresis mode to prevent undesirable jumping from digital mode back to analog mode sequentially. The system also compensates for digital AM frequency quality issues by adjusting a filter bandwidth when the transceiver blends the AM signal from analog to digital mode.Type: GrantFiled: June 16, 2006Date of Patent: May 31, 2011Assignee: Harman International Industries, IncorporatedInventors: Vasant Shridhar, Mark Spellman, Nicolai Pavlov
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Publication number: 20110122937Abstract: A method and a device enable signal-to-noise (SNR) measurement. The system includes the following steps: (i) at least one first network component transmits bursts to at least one second network component, wherein each burst comprises several sub-carriers or tones; and (ii) a third network component performs an SNR measurement for the bursts. In addition, a communication system with such a device is described.Type: ApplicationFiled: April 2, 2009Publication date: May 26, 2011Applicant: Nokia Siemens Networks OyInventors: Martin Kuipers, Matthias Schnitter
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Patent number: 7949360Abstract: An apparatus that adaptively allocates transmission power for beam-forming combined with orthogonal space time block codes in a distributed wireless communication system, the apparatus including: sub-arrays for beam-forming, which are geographically distributed and each of which includes a plurality of distributed antennas placed in random groups. A central processing unit provides predetermined combinable power allocation schemes according to subsets in a plurality of the sub-arrays, identifying performances of the schemes by using information on large-scale fading of each of the sub-arrays fed back from a receiving party, setting a subset having best performance as an optimal subset according to the identified performances, and performing power allocation according thereto.Type: GrantFiled: October 25, 2007Date of Patent: May 24, 2011Assignee: Samsung Electronics Co., Ltd.Inventors: Shuangfeng Han, Yun-Je Oh, Seong-Taek Hwang, Byung-Jik Kim, Han-Lim Lee
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Patent number: 7949040Abstract: A reception quality measuring apparatus of the present invention comprises a first sub-carrier averaging unit for averaging and outputting a channel gain after equalization estimated on the basis of the pilot signal over a sub-carrier, a first power calculation unit for calculating the power of a signal output from the first sub-carrier averaging unit and outputting the same as signal power, a pilot replica generator for generating and outputting a pilot signal replica with respect to a zero-timing signal component based on the zero-timing signal component when a signal x(n) in the time domain after equalization corresponding to the equalized signal is n=0, and also based on a previously set pilot code characteristic, a subtractor for subtracting the pilot signal replica output from the pilot replica generator from the equalized signal and outputting the result as an interference signal, a second power calculation unit for calculating and outputting the power of the interference signal output from the subtracType: GrantFiled: May 12, 2008Date of Patent: May 24, 2011Assignee: NEC CorporationInventors: Shousei Yoshida, Masayuki Kimata
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Patent number: 7945006Abstract: An apparatus for mixing audio signals in a voice-over-IP teleconferencing environment comprises a preprocessor, a mixing controller, and a mixing processor. The preprocessor is divided into a media parameter estimator and a media preprocessor. The media parameter estimator estimates signal parameters such as signal-to-noise ratios, energy levels, and voice activity (i.e., the presence or absence of voice in the signal), which are used to control how different channels are mixed. The media preprocessor employs signal processing algorithms such as silence suppression, automatic gain control, and noise reduction, so that the quality of the incoming voice streams is optimized. Based on a function of the estimated signal parameters, the mixing controller specifies a particular mixing strategy and the mixing processor mixes the preprocessed voice streams according the strategy provided by the controller.Type: GrantFiled: June 24, 2004Date of Patent: May 17, 2011Assignee: Alcatel-Lucent USA Inc.Inventors: Jingdong Chen, Yiteng Arden Huang, Thomas Y Woo
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Publication number: 20110110414Abstract: In a multicellular cooperative radio communications method, the terminals estimate and communicate to all the access points of a cooperating cluster of access points information on the transmission channels between them and each access point of the cluster. The access points include homologous processor for scheduling the servicing of the terminals and operating in accordance with a particular criterion common to all the access points. Finally, the servicing of the terminals is effected jointly by said access points, in an order determined by the processor, using transmission parameters on the basis of the information on the transmission channels transmitted by the terminals.Type: ApplicationFiled: June 26, 2009Publication date: May 12, 2011Applicant: France TelecomInventors: Agisilaos Papadogiannis, Eric Hardouin, David Gesbert
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Patent number: 7940838Abstract: This invention provides a system for evaluating the performance of electronic components and systems by minimizing or eliminating intersymbol interference (ISI). The apparatus includes a transmitter, a device under test, a receiver, and at least one electrical connection between the transmitter and receiver that bypasses the device under test. The electrical connection between the transmitter and receiver transmits information characterizing the intersymbol interference of the transmitted signal to the receiver. The receiver includes an equalizer that uses the information characterizing the intersymbol interference of the transmitted signal to minimize or eliminate intersymbol interference in the received signal where the distortion introduced by the device under test can be isolated and characterized.Type: GrantFiled: July 20, 2009Date of Patent: May 10, 2011Assignee: Applied Wave Research, Inc.Inventor: Kurt R. Matis
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Patent number: 7933321Abstract: A measuring system (1) comprises a signal generator (2), generating a digital modulated high frequency measuring signal (MS), for supplying to the input (4) of a test unit (4). A signal analyser (5) connected to the output (6) of the test unit (4), analyses the output signal (OS) of the test unit (4) after a demodulation. A direct connection (7) is provided between the signal generator (2) and the signal analyser (5), by means of which a reference signal (Ref) is supplied directly to the signal analyser (5) from the signal generator (2).Type: GrantFiled: April 8, 2002Date of Patent: April 26, 2011Assignee: Rohde & Schwarz GmbH & Co. KGInventor: Wolfgang Kernchen
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Patent number: 7933318Abstract: The present invention relates to a first transceiver unit, acting as a receiver unit, and to a second transceiver unit, acting as a transmitter unit. The first transceiver unit measures the signal to noise ratio for each tone, and determine whether a tone shall be shut off, thereby reducing interference on neighboring lines and power consumption. If so, the first transceiver unit keeps on measuring the noise level over that tone. If the ratio of the initially measured signal level to the newly measured noise level exceeds a pre-determined threshold, then the first transceiver unit requests the second transceiver unit to re-activate that tone. A new initialization sequence is transmitted over that tone for initializing the frequency domain equalizer, for measuring the signal to noise ratio, and finally for agreeing on a bit loading.Type: GrantFiled: November 4, 2004Date of Patent: April 26, 2011Assignee: AlcatelInventors: Etienne André Hubert Van den Bogaert, Jeroen Celina Karel Van Elsen
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Publication number: 20110090945Abstract: A method and apparatus of configuring a multi-cell precoding matrix for a multiple input multiple output (MIMO) operation in a wireless communication system in which a plurality of base stations participate in cooperative communication is provided. A multi-cell precoding matrix is configured using one or more single-cell precoding matrices, and wherein coefficients to be multiplied by the single-cell precoding matrices satisfy a condition in which the product between the multi-cell precoding matrix and a Hermitian matrix of the multi-cell precoding matrix is a unitary matrix. According to the embodiment of the present invention, it is not necessary for all base stations to perfectly know channel information. In addition, a feedback overhead is not high, and complexity is low.Type: ApplicationFiled: September 3, 2009Publication date: April 21, 2011Inventors: Suck Chel Yang, Dong Ku Kim, Yo Han Kim, Jang Hoon Yang, Hyung Tae Kim, Hyuk Jin Chae
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Publication number: 20110090944Abstract: The present invention discloses an effective apparatus and method to measure the received signal quality for a GFSK modulated signal with (or without) an unknown modulation index. The signal quality measurements are based on the decoded (unknown or known) bits and the trellis of the frequency discriminator output. This trellis is pre-calibrated with a reference Rx. The transmitted modulation index is also accurately estimated in this invention.Type: ApplicationFiled: October 19, 2009Publication date: April 21, 2011Inventors: Pansop KIM, Jeng-Hong Chen, Hsin-Hsiang Liu
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Patent number: 7916776Abstract: A system and process for customizing the performance of an xDSL communication system in which a transmitting modem and/or a receiving modem will negotiate a performance parameter for adjustment.Type: GrantFiled: October 20, 2003Date of Patent: March 29, 2011Assignee: Paradyne CorporationInventors: Gordon Bremer, Craig Matthews
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Publication number: 20110069737Abstract: Techniques for efficiently transmitting various types of signaling on the forward and reverse links in an OFDM-based system are described. Instead of specifically allocating subbands to individual signaling channels, signaling data for a signaling channel on a given link is sent as “underlay” to other transmissions that may be sent on the same link. Each wireless terminal is assigned a different PN code. The signaling data for each terminal is spectrally spread over all or a portion of the system bandwidth using the assigned PN code. For the reverse link, a wireless terminal may transmit signaling on all N usable subbands and may transmit traffic data on L subbands assigned for data transmission, which may be a subset of the N usable subbands. For the forward link, a base station may transmit signaling and traffic data for all terminals on the N usable subbands.Type: ApplicationFiled: November 30, 2010Publication date: March 24, 2011Applicant: QUALCOMM INCORPORATEDInventor: Ahmad Jalali
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Publication number: 20110069748Abstract: 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.Type: ApplicationFiled: September 24, 2009Publication date: March 24, 2011Applicant: VERIZON PATENT AND LICENSING, INC.Inventors: James M. Cervenka, John Fasolino, Steven Franks, Stephen Clark, Tiejun J. Xia
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Patent number: 7903746Abstract: A mechanism uses in-situ bidirectional cable wrapping for determining different cable lengths. A calibration mechanism calibrates the high speed transmitter/receiver pair characteristics, and, thus, optimizes the transmission performance between subsystems. The calibration mechanism mitigates the need for frequent error correction and does not incur the performance degradation associated with error correction techniques.Type: GrantFiled: July 26, 2007Date of Patent: March 8, 2011Assignee: International Business Machines CorporationInventors: Brian James Cagno, Gregg Steven Lucas, Thomas Stanley Truman
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Patent number: 7904106Abstract: Disclosed is an apparatus and method for adaptively allocating transmission power for beamforming combined with orthogonal space-time block codes (OSTBC) in a distributed wireless communication system, the apparatus comprising: a plurality of sub-arrays for beamforming, which are geographically distributed and each of which comprises a plurality of distributed antennas placed in random groups; and a central processing unit for identifying performances of subsets by applying a predetermined power allocation scheme according to subsets which can be obtained by combining the sub-arrays, by means of a Nakagami fading parameter and information about large-scale fading of each of the sub-arrays, fed back from a receiving party, for determining a subset having a best performance as an optimal subset according to the identified performances, and for performing power allocation based on the subset set as the optimal subset.Type: GrantFiled: October 12, 2007Date of Patent: March 8, 2011Assignee: Samsung Electronics Co., Ltd.Inventors: Shuangfeng Han, Seong-Taek Hwang, Hoon Kim, Sang-Ho Kim, Jae-Hun Cho, Jae-Hoon Lee, Ki-Uk Song
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Patent number: 7903726Abstract: A signal receiving apparatus includes an indicating unit, a receiving, a system unit which comprises a plurality of electronic components to provide signal processing, a storing unit to store information related to a noise level, and a controlling unit to estimate a signal power level of the data received by the receiving unit, to compare the estimated signal power level of the data with the noise level generated by a power supply to the system unit, and to control the indicating unit to indicate whether the data can be received.Type: GrantFiled: September 6, 2007Date of Patent: March 8, 2011Assignee: Samsung Electronics Co., Ltd.Inventor: Houk Wang
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Patent number: 7904841Abstract: A method and system is described for optimizing a digital filter defined by coefficients that are multiplied by input data and accumulated to generate output data. A factorization set of candidate factors is compiled based on the coefficients. For each of the candidate factors, an optimized solution is generated. To generate the optimized solution, the candidate factor is applied to the coefficients and a working set of terms is compiled. Terms in the working set are converted to power-of-two representations and grouped with other terms that have a common partial sum, or multiple of the partial sum, within their respective power-of-two representations. A reduction set is compiled from the grouped terms and an order of application is selected based on optimization objectives. The reduction set is then applied to the working set of terms to generate the optimized solution, which is ranked and stored based on the optimization objectives.Type: GrantFiled: October 12, 2007Date of Patent: March 8, 2011Assignee: Lockheed Martin CorporationInventors: Walter Vincent Dixon, III, Mark Richard Gilder
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Publication number: 20110051792Abstract: A signal analysis apparatus of an LTE system includes a radio frequency reception unit for receiving a radio frequency signal of the LTE system and converting it into a signal of an intermediate frequency, a digital signal conversion unit for converting an analog signal, processed by the radio frequency reception unit, into a digital signal, a baseband conversion unit for converting the signal of the intermediate frequency into a baseband signal, a baseband signal simple analysis unit for decoding the baseband signal in real time in accordance with an LTE standard, a signal depository for storing the baseband signal, a baseband signal precision analysis unit for decoding and analyzing the baseband signal in accordance with the LTE standard and analyzing various items derived in the decoding process, two switching units for alternatively connecting the baseband conversion unit or the signal depository to the baseband signal simple analysis unit or the baseband signal precision analysis unit, and a control unitType: ApplicationFiled: August 31, 2010Publication date: March 3, 2011Applicant: INNOWIRELESS CO., LTD.Inventors: Jinsoup JOUNG, Kyeongmin HA, Seunghwan JI, Jaesung LEE
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Patent number: 7894512Abstract: A communications device includes a time/frequency error measurement circuit that receives a communications signal and measures its timing and frequency errors. A Kalman filter receives the communications signal from the time/frequency error measurement circuit and processes the signal using a multi-level state error covariance matrix P for controlling the Kalman gain in the Kalman filter. An on-line monitoring circuit is operative with the Kalman filter for monitoring the actual state errors in time and frequency and controlling the state error covariance matrix P based on a measured error threshold.Type: GrantFiled: July 31, 2007Date of Patent: February 22, 2011Assignee: Harris CorporationInventors: Edward R. Beadle, John F. Dishman
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Patent number: 7894775Abstract: Antenna noise temperature is determined for a handheld wireless communication device which typically includes a radio, e.g. having a wireless transceiver and associated circuitry connected thereto, and an antenna connected to the radio. The method includes measuring an antenna thermal noise component, measuring a radio noise component, measuring an environmental background noise component, and determining the antenna noise temperature based upon the measured antenna thermal noise, radio noise, and environmental background noise components. The method may include measuring antenna efficiency, and determining further includes weighting at least one of the measured antenna thermal noise, radio noise and environmental background noise components based upon the measured antenna efficiency.Type: GrantFiled: March 27, 2009Date of Patent: February 22, 2011Assignee: Research In Motion LimitedInventors: Yihong Qi, Perry Jarmuszewski
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Publication number: 20110038405Abstract: A communication method for use in a first cellular communications system is proposed for minimizing the interference caused by strong interfering pulses in the same frequency band as the system or an adjacent frequency band. The method comprises the steps of receiving an incoming signal bandpass filtering the incoming signal to filter out a first frequency band (B1) used by the communications system and forwarding the bandpass filtered signal to a receiver unit (35) for processing and forwarding the processed signal to a signal detector (37) arranged to detect the wanted signal. Redirecting a fraction of the received signal and detecting the power of the redirected fraction. Using the detected power to modify the function of the signal detector (37).Type: ApplicationFiled: April 8, 2008Publication date: February 17, 2011Inventors: Johan Axnas, Vimar Bjork, Markus Ringstrom
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Publication number: 20110038406Abstract: A digital communication system which applies channel coding and QAM modulation, where in QAM, at the transmitter, a number Q of bits is mapped to one QAM symbol, which is transmitted over the channel, at the receiver side, for each QAM symbol, a de-mapping is performed in order to obtain an L-value for each bit which corresponds to the QAM symbol, such that these L-values provide not only an estimation of the transmitted bits but also give information about their reliabilityType: ApplicationFiled: April 15, 2008Publication date: February 17, 2011Inventor: Stephan Pfletschinger
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Patent number: 7889778Abstract: A circuit for detecting attacks by contacting an integrated circuit chip comprising means for applying a random signal to a first terminal of at least one conductive path formed in at least one first metallization level of the chip, means for comparing the applied signal with a signal present on a second terminal of the path, and means for delaying the comparison time with respect to the application time, of a duration longer than or equal to the propagation delay through the first path.Type: GrantFiled: March 31, 2005Date of Patent: February 15, 2011Assignee: STMicroelectronics, SAInventors: Fabrice Marinet, Camille Botella
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Patent number: 7884715Abstract: A method for implementing program execution integrity (PEI) for a communication-based sensor includes receiving an output communication message from the sensor, the output communication message including sensor output data internally processed within the sensor. The output communication message further includes raw data used by the sensor in internally processing the sensor output data. The raw data is independently processed, and the results thereof are compared with the internally processed sensor output data so as to verify the processing integrity of the sensor to a desired tolerance.Type: GrantFiled: August 4, 2004Date of Patent: February 8, 2011Inventors: Scott M. Wendling, Terrence D. Smith, Jeffrey T. Klass, Takashi Miyano
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Publication number: 20110026575Abstract: The present invention comprises a system and method for reduction of the influence of crosstalk, increase in and control over quality of service, increase in stability and reduction of power use in a system having multiple transmission lines. A novel crosstalk measurement method is introduced. Knowing the crosstalk, various algorithms may be employed, for example to reduce or eliminate its effects in order to guarantee a bit error rate equal to or less than the maximum allowed for each line. Similar methods are provided to minimize power consumption, or maximize related measures of line performance. Systems, devices, methods and techniques are provided that allow communication system to adapt transmission power margin, power spectral densities, and the like dynamically to changing subscriber's application needs in MIMO systems.Type: ApplicationFiled: April 5, 2009Publication date: February 3, 2011Applicant: Obimey Ltd.Inventors: Eldad Shalom, Yuval Shalev
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Publication number: 20110026574Abstract: Techniques for estimating desired signal power and noise power of a signal received over a communications channel. In an aspect, a pilot autocorrelation matrix is derived based on certain assumptions about the time delay profile, Doppler profile, and/or spatial correlation of the channel. The pilot autocorrelation matrix is decomposed into a set of eigenvectors. From the eigenvector decomposition, a set of dominant eigenvectors is selected to estimate the signal power, while a set of non-dominant eigenvectors is selected to estimate the noise power. The techniques may readily be applied to arbitrary pilot patterns and to a wide array of SNR ranges and channel conditions.Type: ApplicationFiled: July 28, 2009Publication date: February 3, 2011Applicant: QUALCOMM IncorporatedInventors: Yan Zhou, Jibing Wang
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Patent number: 7881672Abstract: A digital demodulating apparatus comprises a tuner constituted by circuit elements to perform channel select processing to a signal; a demodulator that performs demodulation processing to a signal output from the tuner; a power supply unit that supplies a normal power to each circuit element, and supplies to the circuit element a test power different from the normal power, over a first time period in place of the normal power; a test noise measuring unit that measures the intensity of test noise contained in a signal to be output from the tuner, when the power supply unit supplies the test power over the first time period; a comparing unit that compares the intensity of the test noise measured by the test noise measuring unit with a noise reference value as a reference for updating of the normal power; and a power updating unit that updates the intensity of the normal power on the basis of a result of the comparison by the comparing unit.Type: GrantFiled: January 18, 2007Date of Patent: February 1, 2011Assignee: Sharp Kabushiki KaishaInventors: Nobuyoshi Kaiki, Takae Sakai, Masayuki Natsumi, Kazumasa Kioi
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Publication number: 20110019727Abstract: A method and system for determining synchronization status in a wide band CDMA (WCDMA) network may comprise calculating a signal to noise ratio (SNR) of a downlink dedicated physical channel (DPCH) based on a plurality of transmit power control (TPC) bits received via the downlink dedicated physical channel (DPCH), wherein the value of at least one of the plurality of TPC bits is not known when at least one of the plurality of TPC bits is received. The transmit circuitry may be controlled based on the calculated signal to noise ratio. The transmit circuitry may be disabled if the calculated SNR of the plurality of TPC bits is below a first channel threshold. The transmit circuitry may be enabled if the calculated SNR of the plurality of TPC bits is above a second channel threshold.Type: ApplicationFiled: October 5, 2010Publication date: January 27, 2011Inventors: Severine Catreux-Erceg, Mark Kent, Uri M. Landau, Vinko Erceg
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Patent number: 7876815Abstract: Methods and apparatus to qualify a wire-pair for a digital subscriber line (DSL) service are disclosed. An example method comprises modifying a digital subscriber line (DSL) signal received on a wire-pair at a DSL modem to emulate an environmental condition, and qualifying the wire-pair for a DSL service based on a DSL connection rate achieved by the DSL modem during the emulated environmental condition.Type: GrantFiled: May 15, 2007Date of Patent: January 25, 2011Assignee: AT&T Intellectual Property I, L.P.Inventors: Jin Wang, Kapil Shrikhande, Raghvendra Gurudath Savoor
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Patent number: 7873324Abstract: Apparatus and method for processing a received pilot to obtain noise estimation of a pilot channel and processing a received first signal channel, separately from a second signal channel that is orthogonal to the first signal channel, to obtain a signal level of the first signal channel. The noise estimation and the signal level are used to calculate a SNR value. Detection on the first channel is done by checking the SNR and the sign of a soft metric.Type: GrantFiled: December 21, 2007Date of Patent: January 18, 2011Assignee: Broadcom CorporationInventors: Jun Wu, Hongwei Kong, Li Fung Chang
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Patent number: 7872981Abstract: Techniques for selecting rates for data transmission on eigenmodes of a MIMO channel are described. An access point transmits an unsteered MIMO pilot via the downlink. A user terminal estimates the downlink channel quality based on the downlink unsteered MIMO pilot and transmits an unsteered MIMO pilot and feedback information via the uplink. The feedback information is indicative of the downlink channel quality. The access point estimates the uplink channel quality and obtains a channel response matrix based on the uplink unsteered MIMO pilot, decomposes the channel response matrix to obtain eigenvectors and channel gains for the eigenmodes of the downlink, and selects rates for the eigenmodes based on the estimated uplink channel quality, the channel gains for the eigenmodes, and the feedback information. The access point processes data based on the selected rates and transmits steered data and a steered MIMO pilot on the eigenmodes with the eigenvectors.Type: GrantFiled: May 12, 2005Date of Patent: January 18, 2011Assignee: Qualcomm IncorporatedInventors: Arnaud Meylan, Santosh Abraham, Sanjiv Nanda
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Publication number: 20110007791Abstract: A method for the generation of a signal including a minimum of disturbances and noise is provided. A method for the detection of a signal including a minimum of disturbances and noise is also provided. An element of the signal is functionally dependent on at least one further element of the signal.Type: ApplicationFiled: February 26, 2008Publication date: January 13, 2011Inventor: Jaroslaw Kussyk
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Publication number: 20110002372Abstract: Embodiments of methods and apparatus for providing downlink channel parameters determination for downlink channels associated with a multiple-input-multiple-output (MIMO) system are generally described herein. Other embodiments may be described and claimed.Type: ApplicationFiled: September 15, 2010Publication date: January 6, 2011Inventors: Qinghua Li, Xintian E. Lin, Guangjie Li, Kuilin Clark Chen, Xiaoyun May Wu
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System and method for adjusting DIDO interference cancellation based on signal strength measurements
Publication number: 20110002371Abstract: A machine-implemented system and method are described for removing interference between adjacent distributed-input-distributed-output (DIDO) clusters comprising. For example, a method according to one embodiment comprises: detecting signal strength at a first client from a main DIDO cluster; detecting interference signal strength at the first client from an interfering DIDO cluster; if the signal strength from the main DIDO cluster reaches a specified value relative to the value of the interference signal strength from the interfering DIDO cluster, then generating channel state information (CSI) defining channel state between one or more antennas of the first client and one or more antennas of the interfering DIDO cluster; transmitting the CSI from the first client to a base transceiver station (BTS) in the interfering DIDO cluster; and implementing DIDO precoding with inter-DIDO-cluster interference (IDCI) cancellation at the BTS in the interfering DIDO cluster to avoid RF interference at the first client.Type: ApplicationFiled: June 16, 2010Publication date: January 6, 2011Inventors: Antonio Forenza, Stephen G. Perlman -
Patent number: 7865159Abstract: An RF switch is used in the signal path to an amplifier, for example between a receiving antenna and an amplifier. The switch is used to alternately connect the amplifier between a normal signal source for the amplifier and a fixed load for calibration. The power difference between the two switch states at the output of the amplifier would then yield a calibrated measurement of a signal value, such as rise over thermal (RoT). The amount of time spent in the calibration position is maintained at a minimized level so as to reduce impact on the normal operation of the amplifier. The invention provides an ability to estimate traffic load in a repeater system based on RoT measurements of repeater reverse-link output power by determining a reverse link gain.Type: GrantFiled: November 2, 2006Date of Patent: January 4, 2011Assignee: Qualcomm IncorporatedInventor: Richard F. Dean