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13933results about "Transmitter/receiver shaping networks" patented technology
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Device for in-vivo imaging
ActiveUS7009634B2Quality improvementTelevision system detailsTelevision system scanning detailsEngineeringIn vivo
The present invention provides a system and method for obtaining in vivo images. The system contains an imaging system and an ultra low power radio frequency transmitter for transmitting signals from the CMOS imaging camera to a receiving system located outside a patient. The imaging system includes at least one CMOS imaging camera, at least one illumination source for illuminating an in vivo site and an optical system for imaging the in vivo site onto the CMOS imaging camera.
Owner:GIVEN IMAGING LTD
Channel equalization system and method
InactiveUS6904110B2Increase high performance and data rate capacityLow costMultiple-port networksChannel dividing arrangementsFiberEngineering
A system and method for delivering increases speed, security, and intelligence to wireline and wireless systems. The present invention increases channel capacity by using a parallel or multi-channel structure in such wireless and wireline at the edge or the core of. This new architecture of the present invention uses parallel bitstreams in a flexible way and distributed switching / routing technique, is not only to avoid the potential bottlenet of centralized switches, but also to increase speed with intelligence that is seamlessly integrating into the Fiber Optic Backbone such as WDM and SONET of the MAN / WAN network with a Real-time guarantees, different types of traffic (such as Stringent synchronous, isochronous, and asynchronous data messages) with different demands, and privacy & security of multi access and integrated services environment.
Owner:B C LEOW
Head end receiver for digital data delivery systems using mixed mode SCDMA and TDMA multiplexing
InactiveUS7050419B2Improve performance（SNR） ratioTransmission control/equlisationMultiple modulation transmitter/receiver arrangementsDigital dataDOCSIS
A pipelined digital data receiver for a cable TV headend which is capable of receiving DOCSIS 1.0 or 1.1 or advanced PHY TDMA or SCDMA bursts having programmable symbol rates and programmable modulation types as well as a host of other burst parameters such at Trellis code modulation on or off, scrambling on or off, various values for Reed-Solomon T number and codeword length. The receiver has an RF section to filter and digitize incoming RF signals. It also has an input section to detect impulse noise and do match filtering and despread SCDMA bursts. A timing recovery section recovers the symbol clock and detects the start of bursts and collisions. A rotational amplifier and equalizer calculate and track gain, phase and frequency offsets and correct symbols and calculates equalization coefficients. A decoder section decodes TCM and non TCM bursts, and a Reed-Solomon decoder section reconstructs RS codewords and uses them to error correct the payload data.
Owner:GOOGLE TECH HLDG LLC
Channel adaptive equalization precoding system and method
InactiveUS20030086515A1Increase high performance and data rate capacityLow costChannel dividing arrangementsError detection/prevention using signal quality detectorPrecodingOperational system
Owner:TRANS FRANCOIS +1
Orthogonal differential vector signaling
ActiveUS20110268225A1Enhanced signalImprove the immunityTransmission path divisionSecret communicationPhysical spaceTransformer
Using a transformation based at least in part on a non-simple orthogonal or unitary matrix, data may be transmitted over a data bus in a manner that is resilient to one or more types of signal noise, that does not require a common reference at the transmission and acquisition points, and / or that has a pin-efficiency that is greater than 50% and may approach that of single-ended signaling. Such transformations may be implemented in hardware in an efficient manner. Hybrid transformers that apply such transformations to selected subsets of signals to be transmitted may be used to adapt to various signal set sizes and / or transmission environment properties including noise and physical space requirements of given transmission environments.
Owner:ECOLE POLYTECHNIQUE FEDERALE DE LAUSANNE (EPFL)
Signal modulation method resistant to echo reflections and frequency offsets
ActiveUS9083595B2Improve performancePromote decompositionNetwork traffic/resource managementMulti-frequency code systemsHigh rateEngineering
A method of modulating communications signals, such as optical fiber, wired electronic, or wireless signals in a manner that facilitates automatic correction for the signal distortion effects of echoes and frequency shifts, while still allowing high rates of data transmission. Data symbols intended for transmission are distributed into N×N matrices, and used to weigh or modulate a family of cyclically time shifted and cyclically frequency shifted waveforms. Although these waveforms may then be distorted during transmission, their basic cyclic time and frequency repeating structure facilitates use of improved receivers with deconvolution devices that can utilize the repeating patterns to correct for these distortions. The various waveforms may be sent in N time blocks at various time spacing and frequency spacing combinations in a manner that can allow interleaving of blocks from different transmitters. Applications to channel sounding / characterization, system optimization, and also radar are also discussed.
Owner:COHERE TECH
Method and system for approximating graphic equalizers using dynamic filter order reduction
InactiveUS20050201572A1Limited computing resourceImprove approachTransmission control/equlisationTransmitter/receiver shaping networksMulti bandGraphics
Improved approaches to flexibly implementing graphic equalizers on media players are disclosed. These approaches provide dynamic order reduction of a multi-band graphic equalizer so that equalizer effects can be timely performed with only limited computational resources. In one embodiment, a media player receives a media item and associated equalizer settings for a multi-band graphic equalizer. The media player can then automatically (i.e., without user action) approximate the multi-band graphic equalizer with the equalizer settings for the media item using a fewer number of filters. Fewer filters means order reduction, and thus reduction in computational requirements. After the multi-band graphic equalizer is approximated, the media player can present the media item to its user in accordance with the reduced complexity, approximated equalizer.
Owner:APPLE INC
Digital television transmitter and method of coding data in digital television transmitter
InactiveUS20070071110A1Enhance decoding functionImprove reception qualityPicture reproducers using cathode ray tubesCode conversionMultiplexingMultiplexer
A digital television (DTV) transmitter and a method of coding data in the DTV transmitter method are disclosed. A pre-processes enhanced data by coding the enhanced data for forward error correction (FEC) and expanding the FEC-coded enhanced data. A data formatter generates enhanced data packets including the pre-processed enhanced data and inserting known data to at least one of the enhanced data packets. A first multiplexer multiplexes main data packets with the enhanced data packets, and a data randomizer randomizes the multiplexed data packets. A Reed-Solomon (RS) encoder RS-codes the randomized data packets by adding first parity data, and a data interleaver interleaves the RS-coded data packets. A trellis encoder trellis-encodes the interleaved data packets, wherein the trellis encoder may be initialized when a known data sequence is inputted thereto.
Owner:LG ELECTRONICS INC
Transmission circuit and communication device
InactiveUS20120099675A1Smooth switchingPrevent stateHigh frequency amplifiersModulation with suppressed carrierAudio power amplifierVariable-gain amplifier
Provided is a transmission circuit which allows smooth switching of the operation mode when switching the operation mode of the transmission circuit. A power amplifier 14 includes: a first input terminal to which a direct-current voltage or a voltage in accordance with an amplitude signal M is supplied; a second input terminal to which an output signal from a first variable gain amplifier 171 or an output signal from a second variable gain amplifier 172 is inputted; and a third input terminal to which an output signal from a first bias circuit 15 or an output signal from a second bias circuit 16 is inputted. A control section 11 switches the operation mode of the transmission circuit so that at least one of the first input terminal, the second input terminal, and the third input terminal of the power amplifier is prevented from being in a no input state.
Owner:PANASONIC CORP
Space-time coding and channel estimation scheme, arrangement and method
InactiveUS6891897B1Improve spectral efficiencyIncreased improved bandwidth efficiencySpatial transmit diversityChannel estimationHigh rateFrequency spectrum
The evolution of high rate data services within future wireless networks will call for new RF access technologies to enable substantial increases in overall system spectral efficiency at an acceptably low cost to the user. Space-Time Coding (STC) is an antenna array processing technology currently simulating considerable Interest across the wireless industry. The invention provides a space-time coding apparatus having an input, a trellis encoder, a modulator, a demultiplexer, and a set of signal outputs wherein the input is operable to receive a stream of data. This allows de-multiplexing to take place after coding and modulation has been performed. The trellis encoder comprises a convolutional encoder operable to sequentially group data to provide coded bits to provide QPSK symbols. By the selection of convolutional encoder rates and / or modulation alphabets STCs of any desired dimensionality may be produced including multi-dimensional codes.
Owner:APPLE INC
System, method and apparatus for mobile transmit diversity using symmetric phase difference
InactiveUS20100266063A1Easy to receiveQuality improvementPower managementAmplitude-modulated carrier systemsPhase differenceDiversity scheme
Communication is performed for a first communication device having a set of antenna elements. A quality-indication signal is received from a second communication device (e.g., a basestation). A complex weighting is calculated based on the quality-indication signal. A pre-transmission signal is modified based on the complex transmit diversity weighting to produce a set of modified-pre-transmission signals, wherein the modifications are symmetric by making approximately half the magnitude of the transmit diversity modification to one signal in a first direction, and approximately half the magnitude of the transmit diversity modification to the other signal in a second direction, opposite the first direction. Each modified pre-transmission signal from the set of modified-pre-transmission signals is uniquely associated with an antenna element from the set of antenna elements. The set of modified-pre-transmission signals is sent from the set of antenna elements to produce a transmitted signal.
Owner:GOOGLE LLC
Method for automatic control of rf level of a repeater
A method and apparatus for controlling an output power level of a radio frequency (RF) repeater (100 or 200). A system includes a receiver to receive a signal, a filtering unit configured to pass frequency components at or around a frequency band of a predetermined communication channel, an attenuator (124 or 142) to produce an attenuated signal by attenuating a parameter of the signal, a power amplifier (150) to adjust the output power level of repeater to a desired level by adjusting the gain of one or more components of the system, and a microprocessor (170) to receive an input responsive to the output power level of the repeater and, in response to the input, to transfer control signals to the receiver and the attenuator. The method includes sampling traffic load characteristics during operation of a network and adjusting a gain of one or more components of the repeater based on the traffic load characteristics.
Owner:AXELL WIRELESS
Digital E8-VSB reception system and E8-VSB data demultiplexing method
InactiveUS20050111586A1Enhanced signalStable receptionTelevision system detailsPulse modulation television signal transmissionMultiplexingChannel decoder
An enhanced 8-VSB reception system and E8-VSB data demultiplexing method, by which an E8-VSB signal can be stably received as well as a previous ATSC 8VSB signal, is disclosed. Herein, the enhanced data are coded at ½ code rate and ¼ code rate in the new E8-VSB transmission system compatible with the conventional ATSC 8VSB system, respectively. The ½ and ¼ enhanced data are multiplexed by 164-byte packet unit according to the previously determined multiplexing format and further pre-processed to output as the format of the MPEG transport packet. And, the pre-processed enhanced data and the main data are multiplexed again by 188-byte packet unit according to the previously determined multiplexing format. The E8-VSB map information, which was inserted in the field sync section in the E8-VSB transmission system to be transmitted, is extracted to generate the information indicating the attributes of the respective E8-VSB data. The normal data, ½ enhanced data, and ½ enhanced data are separated from each other to be decoded in the channel decoder.
Owner:LG ELECTRONICS INC
Multi-stage code generator and decoder for communication systems
InactiveUS7068729B2Reduce expensesOther decoding techniquesOther error detection/correction/protectionCommunications systemOrder set
Owner:QUALCOMM INC
Mimo-ofdm system using eigenbeamforming method
ActiveUS20070177681A1Reduce the amount requiredMultiplex system selection arrangementsSpecial service provision for substationFourier transform on finite groupsShort terms
Disclosed is a MIMO-OFDM system, wherein the transmitter comprises a serial / parallel converter for converting continuously inputted symbols of the number of subcarriers to K parallel signals; a signal reproducer for reproducing K parallel signals by the number of transmit antennas L an eigenmode generator for generating eigenbeam of the reproduced signals outputted from the signal reproducer at each subcarrier, on the basis of Nf eigenbeam forming vectors which are fed back long-term and information of a best eigenbeam forming vector at each subcarrier which is fed back short-term, through the feedback device; and a plurality of inverse Fourier converters for receiving the signals outputted from the eigenmode generator and generating an OFDM symbol.
Owner:ELECTRONICS & TELECOMM RES INST
Method and apparatus of codebook-based single-user closed-loop transmit beamforming (SU-CLTB) for OFDM wireless systems
ActiveUS20090041150A1Improve throughputMaximize signal to noise ratioMultiple-port networksAntenna arraysCommunications systemClosed loop
A method includes broadcasting, at a transmitter, messages comprising antenna configuration, antenna spacing and a number of antenna of the transmitter and reference signals; generating, at a receiver, a codebook comprising a plurality of antenna beams based on the broadcasted messages; receiving, at the receiver, the broadcasted reference signals; selecting, at the receiver, an antenna beam among the plurality of antenna beams within the codebook in dependence upon a predetermined performance criteria of a data communication system and in dependence upon the broadcasted reference signals; feedbacking to the transmitter, at the receiver, information comprising the antenna beam selected by the receiver; optimizing, at the transmitter, a beamforming process by utilizing the feedback information from the receiver; transmitting, at the transmitter, data signals by utilizing the optimized beamforming process; and receiving and processing, at the receiver, the data signals in dependence upon the selected antenna beams within the codebook.
Owner:SAMSUNG ELECTRONICS CO LTD
Combined digital adaptive pre-distorter and pre-equalizer system for modems in link hopping radio networks
InactiveUS20030058959A1Amplifier modifications to reduce non-linear distortionSecret communicationAudio power amplifierModem device
A method for a combined adaptive digital pre-distorter and pre-equalizer apparatus in single- and / or multiple-link hopping radio systems including hopping among a plurality of radio links to transmit variable-length bursts of radio signals on the plurality of radio links. Further, pre-distorting amplitude and phase of transmitted signal constellations based on the inverse AM-to-AM and AM-to-PM characteristics and the operating conditions of the high-power amplifier, respectively. Further, pre-equalizing amplitude and group-delay variations of the transmit RF radio using the pre-stored estimated complex tap coefficient of the pre-equalizer under different frequency bands.
Owner:RADIANT NETWORKS
Digital communication system for transmitting and receiving robustly encoded data
Owner:ZENITH F ECTRONICS LLC
OFDM communication channel
InactiveUS20050207334A1Improve performanceFacilitate communicationTime-division multiplexChannel estimationComputer scienceDistortion
In an OFDM-based receiver, means for achieving time synchronization comprising: A. means for extracting pilot signals contained in the OFDM received signal; B. means for analyzing the pilot signals in the frequency domain and for issuing a signal indicative of a synchronization error in the received signal; C. means for correcting the synchronization error responsive to the signal indicative of the synchronization error. In an OFDM-based receiver, automatic frequency correction means in a subscriber unit comprising: A. an inner frequency correction loop for generating a LO frequency related to a frequency of a received signal; B. an outer frequency correction loop for correcting the LO frequency according to instructions received from a base station. In an OFDM-based receiver, a channel sounder comprising: A. means for extracting pilot signals contained in the OFDM received signal; B. means for analyzing the pilot signals in the frequency domain and for issuing signals indicative of a distortion in each pilot signal, wherein each of said pilot distortion signals comprises both an amplitude and a phase component; C. means for analyzing the signals indicative of a distortion in each pilot signal and for computing therefrom corrective signals for correcting distortions in the received signal.
Owner:HADAD ZION
High bandwidth data transport system
InactiveUS7376191B2High bandwidthIncrease data rateModulated carrier system with waveletsColor television with pulse code modulationComputer hardwareHigh bandwidth
The present invention provides for a methods, system, and apparatus relating to data transmission. One method of the present invention includes representing data using at least one pulse based on a Gaussian wave form, sending the at least one pulse over an electrically conductive guided media, and recovering the data from the at least one pulse. The present invention can be used in conjunction with telephony applications, cable tv applications, and data bus applications.
Owner:LIGHTWAVES SYST
Spatio-temporal processing for communication
InactiveUS6888899B2Reduce complexityEfficiency benefitError prevention/detection by using return channelSpatial transmit diversityTransmitter antennaHandling system
A space-time signal processing system with advantageously reduced complexity. The system may take advantage of multiple transmitter antenna elements and / or multiple receiver antenna element or multiple polarizations of a single transmitter antenna element and / or single receiver antenna element. The system is not restricted to wireless contexts and may exploit any channel having multiple inputs or multiple outputs and certain other characteristics. Multi-path effects in a transmission medium cause a multiplicative increase in capacity.
Owner:CISCO TECH INC
Digital modulation signal receiver with adaptive channel equalization employing discrete fourier transforms
InactiveUS6975689B1Extended durationTelevision system detailsError preventionInverse discrete fourier transformFourier transform on finite groups
Techniques for calculating the system characteristic of the adaptive filtering used for equalization and echo-suppression in a digital communications receiver, such as one used for receiving over-the-air broadcast digital television signal, are described. In these techniques, the system characteristic of the adaptive filtering is calculated from the discrete Fourier transform of successive portions of the input signal supplied to the adaptive filtering and from the discrete Fourier transform of corresponding portions of the transmitted signal, as estimated in the receiver. Receivers for implementing these techniques in various ways are also disclosed.
Owner:MCDONALD JAMES DOUGLAS +1
Spectral optimization for communication under a peak frequency-domain power constraint
InactiveUS6839429B1Maximize capacityMinimize effect of interferencePower managementSubstations coupling interface circuitsFrequency spectrumPeak value
System and methods for determining an optimized transmit spectra (spectral distributions of transmission power) for a set of communications channels that experience cross-talk among themselves and for transmitting data on the channels. The transmit spectra are preferably constructed so that largely contiguous frequency bands are allocated to each signaling direction (upstream / downstream) on each communications channel and / or to each channel in the set of channels. In one embodiment, each communications channel is restricted to a maximum time-averaged power. The method preferably includes steps of determining the channel transfer functions of the communications channel, determining interference characteristics of the channels, calculating substantially optimal transmit spectra for the communications channels, and redistributing the frequency bins so that they are contiguously grouped in each transmit spectra. The contiguous groupings allow wider frequency bands for signaling in the channel. In one embodiment, the channel is limited by a “peak-power constraint.”
Owner:RICE UNIV
Method and apparatus for multipath signal compensation in spread-spectrum communications systems
ActiveUS7054396B2Effective multipath signal compensationChange effective lengthMultiple-port networksError preventionCommunications systemImage resolution
The equalizer of the present invention operates on input multipath signal samples, preferably at chip or sub-chip resolution, to remove or substantially cancel the effects of one or more secondary signals from the main path signal. Using predetermined path information for one or more of the secondary path signals, including magnitude, phase, and time offset relative to the main path signal, the equalizer compensates input multipath signal samples by subtracting estimated secondary signal values from the input samples. For each input sample, the equalizer forms a sliced sample, where the sliced sample represents a nominal phase value defined by the modulation scheme used in the original chip or symbol transmission that is closest in value to the actual phase of the input sample. These sliced samples are held in a running buffer and used, in combination with the predetermined path information and scaling logic, to form the estimated secondary signal values for compensating the input samples.
Owner:QORVO US INC
Method for code evaluation using ISI ratio
ActiveUS9100232B1Fast communication speedReduce power consumptionChannel dividing arrangementsCode division multiplexComputer architectureCode assessment
An efficient communications apparatus is described for a vector signaling code to transport data and optionally a clocking signal between integrated circuit devices. Methods of designing such apparatus and their associated codes based on a new metric herein called the “ISI Ratio” are described which permit higher communications speed, lower system power consumption, and reduced implementation complexity.
Owner:KANDOU LABS
Transmission method and transmission apparatus
ActiveUS20120219089A1Reception quality deterioratesGood serviceModulated-carrier systemsSecret communicationData transmissionPrecoding matrix
All data symbols used in data transmission of a modulated signal are precoded by switching between precoding matrices so that the precoding matrix used to precode each data symbol and the precoding matrices used to precode data symbols that are adjacent to the data symbol along the frequency axis and the time axis all differ. A modulated signal with such data symbols arranged therein is transmitted.
Owner:SUN PATENT TRUST
System and method for distributed input distributed output wireless communications
A system and method are described for compensating for frequency and phase offsets in a multiple antenna system (MAS) with multi-user (MU) transmissions (“MU-MAS”). For example, a method according to one embodiment of the invention comprises: transmitting a training signal from each antenna of a base station to one or each of a plurality of wireless client devices, one or each of the client devices analyzing each training signal to generate frequency offset compensation data, and receiving the frequency offset compensation data at the base station; computing MU-MAS precoder weights based on the frequency offset compensation data to pre-cancel the frequency offset at the transmitter; precoding training signal using the MU-MAS precoder weights to generate precoded training signals for each antenna of the base station; transmitting the precoded training signal from each antenna of a base station to each of a plurality of wireless client devices, each of the client devices analyzing each training signal to generate channel characterization data, and receiving the channel characterization data at the base station; computing a plurality of MU-MAS precoder weights based on the channel characterization data, the MU-MAS precoder weights calculated to pre-cancel frequency and phase offset and / or inter-user interference; precoding data using the MU-MAS precoder weights to generate precoded data signals for each antenna of the base station; and transmitting the precoded data signals through each antenna of the base station to each respective client device.
Owner:REARDEN
Method and system for broadband predistortion linearization
InactiveUS20060240786A1Improve linearization performanceExtends linearization bandwidthAmplifier modifications to reduce non-linear distortionAmplifiers with memory effect compensationTime domainRadio frequency
The invention relates to a method and system for wideband digital pre-distortion linearization, which is used to overcome the influence of memory effect in radio frequency power amplifier, to expand digital pre-distortion linearization bandwidth, and to improve digital pre-distortion linearization performance. The method and system can get an in-band pre-distortion signal and an out-of-band pre-distortion signal according to the characteristic parameter of the amplifier; the in-band pre-distortion signal is up-converted and the up-converted signal is added to the out-of-band pre-distortion signal, which is not up-converted, then the combined signal is inputted to the power amplifier as an input signal; a part of the output signal from the power amplifier, serving as a feedback signal, can be compared with the original input signal, and the characteristic parameter of the amplifier for generating the in-band pre-distortion signal and the out-of-band pre-distortion signal is adaptively regulated according to the comparison result, so that the waveform of time domain or the frequency domain of the feedback signal can be close to that of the original input signal as much as possible.
Owner:ZTE CORP
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