Product
Patsnap Eureka
For R&D, Patsnap Eureka makes reading and utilizing patents & technical documents easy.
Patsnap Eureka AIR
Designed for self-driven R&D workflows. Generate viable solutions, solve complex R&D challenges, empower your innovation with AI.
Patsnap Eureka Materials
Designed for material experts only. Revolutionize your material R&D, from search, analyze, to developing new materials.
Feature
TechResearch
Generate reliable direction feasibility study reports for your R&D in just a few steps.
TechSeek
Discover and master advanced knowledge NOW. Basics, ideas, possibilities, all at once.
TechMind
As an expert in R&D Theories, TechMind can generates customized viable solutions instantly.
TechRisk
Analyze your overall solution with one click, know your potential R&D risks in advance.
TechMonitor
Get weekly tech updates, stay abreast of the latest tech innovations and key insights.
Patents
Literature
Hiro is an intelligent assistant for R&D personnel, combined with Patent DNA, to facilitate innovative research.
1108 results about "Intersymbol interference" patented technology
Efficacy Topic
Property
Owner
Technical Advancement
Application Domain
Technology Topic
Technology Field Word
Patent Country/Region
Patent Type
Patent Status
Application Year
Inventor
In telecommunication, intersymbol interference (ISI) is a form of distortion of a signal in which one symbol interferes with subsequent symbols. This is an unwanted phenomenon as the previous symbols have similar effect as noise, thus making the communication less reliable. The spreading of the pulse beyond its allotted time interval causes it to interfere with neighboring pulses. ISI is usually caused by multipath propagation or the inherent linear or non-linear frequency response of a communication channel causing successive symbols to "blur" together.
System and method for error correcting a received data stream in a concatenated system
A received signal is first converted into a digital sequence that may contain "erasures" (or ambiguity symbols) as well as errors. Then iterative decoding is applied in order to eliminate or reduce the erasures. This decoding procedure works effectively with the associated transmitter that adopts a concatenation of an outer coder, a permutation and an inner coder. The principal of the invention is also applicable to a system in which the inner coder is replaced by a "digital modulator" that introduces some constraint, or a channel that introduces some memory such as partial response signaling, intersymbol interference or multipath propagation. The invention can be applied to many existing systems while maintaining "backward compatibility" in the sense that the transmitter side need not be modified.
Owner:THE TRUSTEES FOR PRINCETON UNIV
Bipolar reading technique for a memory cell having an electrically floating body transistor
A method and a device for the coding and decoding of an information symbol for transmission over a transmission channel or a received signal value is described and illustrated, whereby a channel symbol used for coding is selected from at least two available channel symbols by means of a pre-calculated expected received signal value. The pre-calculation is achieved, based on the echo properties of the transmission channel and transmission values already sent. A pre-coding method with low receiver-side calculation requirement is thus prepared, whereby the information symbol can be transmitted by means of various channel symbols and thus various transmission values can also be transmitted. The possible selections may be used for minimization of the transmission energy and / or to achieve a minimal disturbance or even a constructive effect through the inter-symbol interference occurring on transmission.
Owner:MICRON TECH INC
Uplink resource allocation to control intercell interference in a wireless communication system
ActiveUS20070042784A1Avoid elevationSuitable characteristicPower managementReceivers monitoringCommunications systemUplink transmission
Embodiments of the present invention exploit the reciprocity of radio channels in TDD, and longer-term correlation between average uplink and downlink path losses in FDD wireless communication systems to enable distributed schedulers in an enhanced uplink system to allocate uplink transmission resources while preemptively managing intercell interference levels. Each cell's base station transmits a downlink reference signal at a known transmission power level. A mobile station monitors the received signal strength of the downlink reference signals from multiple base stations. The transmitted and received signal strength levels can be used by the mobile station to estimate the amount of intercell interference that the mobile station's uplink transmissions cause, and the mobile station's uplink transmission parameters are adjusted accordingly. In further embodiments, the received reference signal power levels, or values derived therefrom, are transmitted by the mobile station to its serving base station, where a scheduling algorithm uses the information to adjust one or more transmission parameters relating to a grant of uplink transmission resources to the UE, thereby controlling the intercell interference generated by the mobile station's uplink transmissions.
Owner:SONY CORP
Spectrum-adaptive networking
ActiveUS7483711B2Improve spectral efficiencyImprove throughputPower managementResonant long antennasTransceiverFrequency spectrum
The present invention increases the available spectrum in a wireless network by sharing existing allocated (and in-use) portions of the RF spectrum in a manner that will minimize the probability of interfering with existing legacy users. The invention provides interference temperature-adaptive waveforms, and a variety of physical and media access control protocols for generating waveforms based on measurement and characterization of the local spectrum. The invention measures the local spectrum at a receiving node, generates an optimal waveform profile specifying transmission parameters that will water-fill unused spectrum up to an interference limit without causing harmful interference to primary and legacy transmitters using the same frequency bands, and enables simultaneous transmit and receive modes at a multiplicity of transceivers in a wireless network. The invention also provides closed loop feedback control between nodes, co-site interference management, intersymbol interference mitigation, wide sense stationary baseband signaling and modulation, and power limited signaling for avoiding detection and interception.
Owner:USTA TECH LLC
Wireless communications system that supports multiple modes of operation
InactiveUS20050174981A1Network traffic/resource managementAssess restrictionTransceiverMultiple modes
A wireless communications adapts its mode of operation between spatial multiplexing and non-spatial multiplexing in response to transmission-specific variables. An embodiment of a wireless communications system for transmitting information between a base transceiver station and a subscriber unit includes mode determination logic. The mode determination logic is in communication with the base transceiver station and the subscriber unit. The mode determination logic determines, in response to a received signal, if a subscriber datastream should be transmitted between the base transceiver station and the subscriber unit utilizing spatial multiplexing or non-spatial multiplexing. In an embodiment, the mode determination logic has an input for receiving a measure of a transmission characteristic related to the received signal. In an embodiment, the mode determination logic includes logic for comparing the measured transmission characteristic to a transmission characteristic threshold and for selecting one of spatial multiplexing and non-spatial multiplexing in response to the comparison of the measured transmission characteristic to the transmission characteristic threshold. In an embodiment, the transmission characteristic includes at least one of delay spread, post-processing signal-to-noise ratio, cyclical redundancy check (CRC) failure, residual inter-symbol interference, mean square error, coherence time, and path loss. By adapting the mode of operation in response to transmission-specific variables, the use of spatial multiplexing can be discontinued in unfavorable conditions. Additionally, because the wireless communications system can adapt its mode of operation between spatial multiplexing and non-spatial multiplexing, the communications system is compatible with both subscriber units that support spatial multiplexing and subscriber units that do not support spatial multiplexing.
Owner:APPLE INC
DTV signal with GCR components in plural-data-segment frame headers and receiver apparatus for such signal
InactiveUS7038732B1Television system detailsPulse modulation television signal transmissionData segmentScan line
A DTV signal has a plural-data-segment frame header including complementary first and second ghost-cancellation reference signals differentially delayed by the duration of two NTSC horizontal scan lines. A receiver for such DTV signal has an adaptive equalizer for baseband symbol code with kernel weights calculated by a computer operative on the equalizer response after comb filtering. The comb filter combines the equalizer response as differentially delayed by the duration of two NTSC horizontal scan lines to cancel artifacts of co-channel NTSC interference in the comb filtered equalizer response supplied to the computer. This reduces the undesirable influence of such artifacts on equalization to reduce intersymbol interference.
Owner:SAMSUNG ELECTRONICS CO LTD
Wireless communications system that supports multiple modes of operation
InactiveUS6937592B1Network traffic/resource managementAssess restrictionOperation modeMultiple modes
Owner:APPLE INC
Method of channel order selection and channel estimation in a wireless communication system
InactiveUS6907092B1Choose accuratelyLarge energyError preventionLine-faulsts/interference reductionCommunications systemImpulse response
A novel and useful apparatus for and method of determining the channel order and channel estimate in a communications system such as a wireless communication system including cellular and cordless. Such channels are typically characterized by rapidly changing impulse response and their taps can be modeled as zero-mean, complex, Gaussian random processes. A sufficiently long, initial channel estimate of length is performed so as to ensure that the actual channel taps will be contained in the estimated taps thus making certain that the equalizer will effectively eliminate intersymbol interference. Channel estimation is performed during each burst using the training sequence transmitted in the middle of the burst. The tap energies are averaged so as to track slow variations in the pattern of resultant channel taps. A noise floor is calculated using the lowest averaged taps and a threshold is computed based thereon and applied to the average taps. The channel order and the tap positions are then selected in accordance those average taps that are above the threshold.
Owner:COMSYS COMM & SIGNAL PROC
TX back channel adaptation algorithm
ActiveUS8472513B2Multiple-port networksDelay line applicationsFinite impulse responseCommunications system
Disclosed is a method and system that adapts coefficients of taps of a Finite Impulse Response (FIR) filter to increase elimination of Inter-Symbol Interference (ISI) introduced into a digital communications signal due to distortion characteristics caused by a real-world communications channel. In the communications system there is a Finite Impulse Response (FIR) filter. The FIR filter has at least one pre and / or post cursor tap that removes pre and / or post cursor ISI from the signal, respectively. The pre / post cursor taps each have pre / post cursor coefficients, respectively, that adjusts the effect of the pre / post cursor portion of the FIR filter. The FIR filtered signal is transmitted over the channel which distorts the signal due to the changing and / or static distortion characteristics of the channel. The channel distorted signal is received at a receiver that may pass the channel distorted signal through a quantifier / decision system (e.g., a slicer) as the quantifier input signal to quantify the quantifier input signal to one of multiple digital values. The channel distorted signal may be further adjusted by summing the channel distorted signal with the output of a Decision Feedback Equalizer (DFE) filter to create a DFE corrected signal which then becomes the quantifier input signal. An error signal is determined by finding the difference between the scaled quantifier decision and the quantifier input signal. The pre / post cursor coefficient values that adjust the effects of the pre / post cursor taps of the FIR filter are updated as a function of the error signal and at least two quantifier decision values, and update coefficient values, may be sent over a communications back-channel to the FIR filter.
Owner:AVAGO TECH INT SALES PTE LTD
Apparatus and method for canceling inter-symbol interference in a broadband wireless communication system
ActiveUS20060087961A1Exclude dataSecret communicationMulti-frequency code systemsDelay spreadCommunications system
An apparatus and method for canceling ISI in a broadband wireless communication system are provided. In a transmitter of the broadband wireless communication system, a controller acquires a CP length, a puncturing pattern, and a time sample interval according to a delay spread. A puncturer punctures coded data in the puncturing pattern. An IFFT processor IFFT-processes the punctured coded data and outputs sample data. A CP inserter generates an OFDM symbol by inserting a copy of a last part of the sample data before the sample data. Here, the length of the last part of the sample data is equal to the CP length. A D / A converter converts the OFDM symbol to an analog signal at a sampling rate determined by the time sample interval.
Owner:HUAWEI TECH CO LTD
Receiver circuit comprising equalizer
InactiveUS20050226355A1Increase data rateMinimize interference levelTransmission control/equlisationError preventionEngineeringEqualization
A receiver circuit has an equalizer that equalizes a received signal propagating through a transmission medium; a data detection circuit that detects an analog output signal of the equalizer at a data sample timing and outputs a digital signal; an intersymbol interference detection circuit that detects an intersymbol interference level from the analog output signal of the equalizer at the data sample timing and from the digital signal of the data detection circuit; and an equalization characteristic control unit that controls the characteristic of the equalizer to minimize the detected intersymbol interference level. The receiver circuit further has a data sample timing control unit in which the data sample timing is controlled to a sample timing at which the difference between the amplitude of the analog output waveform of the equalizer with respect to an impulse and the amplitude of an ideal impulse response waveform is minimal.
Owner:FUJITSU LTD
Multicode transmission using Walsh Hadamard transform
InactiveUS7869546B2Remove/mitigate impairmentReduce impactMultiple-port networksDelay line applicationsHadamard transformTime domain
A symbol sequence contained in a received signal comprising a cyclic convolution of a Walsh code multiplexed signal and a channel impulse response of a multipath channel is detected using Walsh Hadamard domain equalization techniques. The method comprises converting the received signal and the channel impulse response of the multipath channel from the time domain to the WHT domain, and determining the symbol sequence based on equalizing the received signal in the WHT domain using WHT spectra of the channel impulse response to remove inter-symbol interference from the received signal due to cross-correlation between Walsh codes.
Owner:TELEFON AB LM ERICSSON (PUBL)
Integrated maximum a posteriori (MAP) and turbo product coding for optical communications systems
InactiveUS20060285852A1Improve fiber performanceImprove bit error rateElectromagnetic transmissionBaseband systemsLogitEqualization
An integrated maximum a posteriori equalization and turbo product coding (IMAP-TPC) system for optical fiber communications systems (OFCS) is provided that uses probabilistic characterization of the electrical current in the presence of inter-symbol interference (ISI) and noise to compensate their effects and improve the bit error rate. In the IMAP-TPC system, turbo product code (TPC) decoding is integrated with a symbol-by-symbol maximum a posteriori (MAP) detector. The MAP detector calculates the log-likelihood ratio of a received symbol using the conditional electrical probability density information, and hence obtains a much more accurate reliability measure than the traditional measure used in the TPC decoder.
Owner:UNIV OF MARYLAND BALTIMORE COUNTY
Method of estimating fading coefficients of channels and of receiving symbols and related single or multi-antenna receiver and transmitter
The method is for estimating the fading coefficients of a plurality of transmission channels on which signals to be sent, generated as a function of a sequence of symbols, are transmitted according to a particular modulation, e.g. AM-PSK modulation. The fading coefficients are estimated by using estimations of the transmitted symbols obtained in advance, thus obtaining DC components of the received signal by coherent demodulation locked to the phases of the transmitted AM-PSK signals, and processing these DC components. The method may not require the choice of a stochastic distribution model of the channel fading, thus it remains efficient even when the channel characteristics vary significantly. Moreover, the method works correctly even if the received stream is disturbed by inter-symbolic interference (ISI) and / or by multi-path fading.
Owner:STMICROELECTRONICS SRL
Methods of spread-pulse modulation and nonlinear time domain equalization for fiber optic communication channels
Methods, apparatus, and systems for an optical communication channel. A data signal is preconditioned prior to transmission over a fiber optic cable to minimize signal distortion and transmitted over a fiber optic cable. Preconditioning may include none, one or more, or all of the following: encoding the data signal using a run length limited code, correlating bits of the data signal, and spreading out the pulses in the time-domain in the data signal. The pulse spreading function can be implemented either in the electrical domain prior to the electrical-to-optical conversion; in the optical domain during and / or after the electrical-to-optical conversion; or a combination of both. During reception, the data signal and clock are recovered. Recovery may include maintaining an amplitude in an electrical signal, filtering the electrical signal, shaping the electrical signal, and removing distortions and intersymbol interference (ISI) from the received electrical signal.
Owner:LUMENTUM OPERATIONS LLC
Rank-order equalization
For digital data transmitted using a vector signaling encoding, a rank-order equalizer cancels various channel noise such as inter-symbol interference. Further, rank-order units may be cascaded to achieve improved equalization over successive sample vector signals in a rank-order equalizer. Multiple rank-order equalizers further operate in parallel in a feed forward mode or in series in a feedback mode to provide a continuous vector signaling stream equalization.
Owner:KANDOU LABS
Adaptive equalizers and methods for carrying out equalization with a precoded transmitter
InactiveUS6167082AEliminateEliminate interferenceMultiple-port networksTransmission control/equlisationDecision circuitEqualization
Adaptive equalization methods and adaptive equalizers used with precoded systems dominated by intersymbol interference (ISI) monitor the output of a DFE and compare it to a reference for updating a precoder in response to the comparison. To accomplish this, an adaptive equalizer includes a feed forward equalizer receiving a signal from a communication channel, the feed forward equalizer equalizing variations in pre-cursor intersymbol interference resulting from changes in characteristics of the channel and providing an output signal to an error correction decoder, a decision circuit, coupled to the feed forward equalizer, for generating error vectors in response to the output signal of the feed forward equalizer and a decision feedback equalizer, coupled to the decision circuit, the decision feedback equalizer monitoring the pre-cursor intersymbol interference of the channel, determining when the transmitter coefficients to the precoder warrant updating, and generating a signal indicating that an update to the transmitter coefficients to the precoder is warranted. The adaptive equalizer farther includes a comparison circuit, the comparison circuit receiving an output from the decision feedback equalizer and comparing the output from the decision feedback equalizer to a reference, the comparison circuit generating the signal indicating that an update to the transmitter coefficients to the precoder is warranted in response to the comparison.
Owner:LEVEL ONE COMM
Wireless internet access system and method
InactiveUS6947408B1Avoid Intersymbol InterferenceAdaptable to changeSpatial transmit diversityError preventionWireless internet accessDifferential phase
A wireless Internet access system and method supports the transmission and reception of multiple types of traffic between mobile subscriber units and existing networks. A frame structure is used that can support the transmission of multiple types of traffic and adapt to changes in the traffic types needed and the amount of data for a particular traffic type. In addition, data transmission is performed using orthogonal frequency division multiplexing and differential phase shift keying to avoid inter-symbol interference. Receiving units in the mobile subscriber units and existing works include antenna arrays to provide a multipath transmission.
Owner:TELCORDIA TECHNOLOGIES INC
MMSE equalizers for DMT systems with cross talk
InactiveUS6097763ABetter signal to noise ratioRaise the ratioSecret communicationMulti-frequency code systemsCommunications systemSignal-to-noise ratio (imaging)
A improved method for optimally equalizing a multicarrier communications system in the presence of both intersymbol interference (ISI) and colored noise. The method provides a frequency-domain training algorithm to obtain a minimum mean square error (MMSE) equalizer that accounts for both intersymbol interference (ISI) and colored noise, maximizes the signal to noise ratio (SNR) of systems using Discrete Multitone (DMT) modulation, and results in significant performance gains over prior equalization methods.
Owner:SYNAPTICS INC
Systems and methods for mitigating intercell interference by coordinated scheduling amongst neighboring cells
ActiveUS20110235598A1Facilitate centralized power schedulingReduce distractionsPower managementNetwork traffic/resource managementUser equipmentComputing systems
A networked computing system capable of mitigating interference amongst neighboring base stations. The networked computing system includes multiple base stations, user equipment, a network resource controller, and a data communications network facilitating data communications amongst all network devices. A serving base station is configured to acquire interference metrics from its local user equipment and then generate an aggregate representation from the acquired interference metrics. The network resource controller is configured to acquire the aggregate representation, determine an interference reduction associated with a neighbor base station for each of the user equipment serviced by the serving base station, determine a power schedule for the first base station based on the aggregate representation and the determined interference reduction, and then modify a power schedule for the neighbor base station based on the determined interference reduction.
Owner:NOKIA SOLUTIONS & NETWORKS OY
Internal interference signaling
In accordance with an illustrative embodiment, a method and device are provided. The method, system, and device comprise an information module and a communication module. The information module may be configured to identify information related to a plurality of signals associated with the device and identify a signal interference affecting a first signal by a second signal of the plurality of signals based on the information. The communication module may be configured to send interference information to a network interface related to the signal interference if the signal interference is identified.
Owner:INTEL CORP
Method and apparatus for DS-CDMA interference suppression using code-specific combining
Interference, such as inter-symbol interference, from a symbol of interest in a RAKE receiver is reduced. The RAKE receiver comprises a plurality of RAKE fingers, a processor, and a combiner. The plurality of RAKE fingers despread symbols received over multiple paths of a multi-path channel. The processor determines cross-correlations between symbol waveforms from different symbols and multiple paths. The combiner combines the despread symbols using the cross-correlations to reduce interference from the symbol of interest.
Owner:TELEFON AB LM ERICSSON (PUBL)
Tx back channel adaptation algorithm
ActiveUS20100177816A1Easy to eliminateMultiple-port networksDelay line applicationsFinite impulse responseDecision system
Disclosed is a method and system that adapts coefficients of taps of a Finite Impulse Response (FIR) filter to increase elimination of Inter-Symbol Interference (ISI) introduced into a digital communications signal due to distortion characteristics caused by a real-world communications channel. In the communications system there is a Finite Impulse Response (FIR) filter. The FIR filter has at least one pre and / or post cursor tap that removes pre and / or post cursor ISI from the signal, respectively. The pre / post cursor taps each have pre / post cursor coefficients, respectively, that adjusts the effect of the pre / post cursor portion of the FIR filter. The FIR filtered signal is transmitted over the channel which distorts the signal due to the changing and / or static distortion characteristics of the channel. The channel distorted signal is received at a receiver that may pass the channel distorted signal through a quantifier / decision system (e.g., a slicer) as the quantifier input signal to quantify the quantifier input signal to one of multiple digital values. The channel distorted signal may be further adjusted by summing the channel distorted signal with the output of a Decision Feedback Equalizer (DFE) filter to create a DFE corrected signal which then becomes the quantifier input signal. An error signal is determined by finding the difference between the scaled quantifier decision and the quantifier input signal. The pre / post cursor coefficient values that adjust the effects of the pre / post cursor taps of the FIR filter are updated as a function of the error signal and at least two quantifier decision values, and update coefficient values, may be sent over a communications back-channel to the FIR filter.
Owner:AVAGO TECH INT SALES PTE LTD
Time error estimation for data symbols
ActiveUS20100166050A1Reduce Intersymbol InterferencePromote resultsError preventionLine-faulsts/interference reductionTime errorTransport system
The invention relates to a method and a system for estimating a symbol time error in a broadband transmission system, comprising: determination a timing error signal of an input-signal of a discrete Fourier-transformation block (5) in a data symbol stream on the basis of intersymbol correlation using a predetermined period in each received symbol, selecting as a predetermined period a number of samples of different useful data parts of a symbol, determining the time error value (ε) based on the intersymbol interference of the selected samples of the different parts of said symbol.
Owner:ENTROPIC COMM INC
System and method for recovering data received over a communication channel
According to a first aspect, there is provided a circuit for recovering data received over a communication channel. The circuit includes an adaptive equalizer operable to remove ISI (intersymbol interference) from a received signal and a timing recovery circuit operable to sample recovered data. The timing recovery circuit includes a detector based on a Hogge Phase detector. According to another aspect, there is provided a module in which the circuit may be implemented. According to another aspect, there is provided a method for recovering data received over a communication channel. The method involves removing ISI from a received signal using an adaptive equalizer, and sampling recovered data using a detector based on a Hogge phase detector. According to another aspect, the timing recovery circuit includes a plurality of phase detectors, each one being operable to sample recovered data. A selector is provided for selecting which sampled recovered data is to be output.
Owner:MARVELL ASIA PTE LTD
Method and apparatus providing an advanced MIMO receiver that includes a signal-plus-residual-interference (SPRI) detector
ActiveUS20050053172A1Maximum performanceReduce in quantitySpatial transmit diversityPhase-modulated carrier systemsIntersymbol interferenceMIMO
A method is disclosed to obtain M final symbol decisions for signals received through N receive antennas that were transmitted in M parallel data layers, using a same spreading code from M transmit antennas. The method includes space-time equalizing the N received signals to generate M output signals from which at least inter-symbol interference is substantially removed and inter-layer interference is suppressed; despreading each of the M output signals for generating M soft symbol estimates; and processing the M soft symbol estimates to derive M final symbol decisions that are made in consideration of modeled residual inter-layer interference present in the space-time equalized M output signals. Processing includes operating a signal-plus-residual-interference (SPRI) detector that operates in accordance with a maximum likelihood (ML) technique, while space-time equalizing employs a linear minimum mean-square error (LMMSE) criterion. Transmitting may occur at a base station having the M transmit antennas, and receiving may occur at a mobile station having the N receive antennas.
Owner:WSOU INVESTMENTS LLC
Method and apparatus for high rate data communication utilizing an adaptive antenna array
In a wideband Personal Communication Services system, a method and system are proposed for suppressing co-channel interference and reducing inter-symbol interference generated during the transfer of a data packet through a selected radio frequency channel. The system includes a weight controller utilizing recursive least squares algorithm to generate a plurality of appropriate weights to be integrated into received signals in order to maximize signal-to-noise ratio. A detected signal or a training sequence is intelligently switched in as a reference sequence in order to generate a plurality of appropriate weights. To further enhance the adaptive array system and take advantage of the multi-path radio frequency communication environment, two multi-path diversity schemes are included. One embodiment includes an adaptive array system with parallel array processors and another embodiment includes a system with tapped delay line processors.
Owner:APPLE INC
Receiver-Based Adaptive Equalizer with Pre-Cursor Compensation
ActiveUS20080240223A1Automatically eliminating pre-cursor inter-symbol interferenceImprove performanceMultiple-port networksDelay line applicationsEngineeringEqualization
An equalization circuit is disclosed that enables high data rate transmission over high loss communications channels. Also disclosed is a set of functional blocks and update criteria that allow for the equalization function to be adapted for a large variety of different communications channels. A fully continuous adaptive equalizer is used in conjunction with a Decision Feedback Equalizer to fully equalize a wide range of communications channels. Interoperability and Bit Error Rate performance are optimized through compensation of pre-cursor inter-symbol interference, which is performed adaptively in the receiver as opposed to the transmitter.
Owner:RAMBUS INC
Apparatus for burst and timing synchronization in high-rate indoor wireless communication
InactiveUS20050185743A1Improve accuracyLow costCarrier regulationData switching by path configurationHigh rateComputer science
An apparatus provides burst and timing synchronization of an input signal used for high-rate indoor wireless communication, comprising. A burst synchronizer (20) is arranged to detect the onset of a burst of the input signal and provides an onset indicator. A frequency offset corrector (12) is arranged to correct the frequency offset between adjacent preamble sequences of frames within the burst of the input signal based on the onset indicator and provides a frequency offset corrected signal. A timing synchronizer (30) is arranged to detect the timing of first symbol of first frame of the frequency offset corrected signal, and provides a timing indicator. An equalizer (40) is arranged to remove inter-symbol interference from the frequency offset corrected signal based on the timing indicator.
Owner:OKI TECHNO CENT SINGAPORE PTE
Wireless internet access system and method
InactiveUS20050100120A1Avoid Intersymbol InterferenceAdaptable to changeSpatial transmit diversityNetwork traffic/resource managementDifferential phaseWireless internet access
A wireless Internet access system and method supports the transmission and reception of multiple types of traffic between mobile subscriber units and existing networks. A frame structure is used that can support the transmission of multiple types of traffic and adapt to changes in the traffic types needed and the amount of data for a particular traffic type. In addition, data transmission is performed using orthogonal frequency division multiplexing and differential phase shift keying to avoid intersymbol interference. Receiving units in the mobile subscriber units and existing networks include antenna arrays to provide a multipath transmission.
Owner:TELCORDIA TECHNOLOGIES INC
Who we serve
- R&D Engineer
- R&D Manager
- IP Professional
Why Patsnap Eureka
- Industry Leading Data Capabilities
- Powerful AI technology
- Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.
© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com