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85results about "Amplitude adaptive predistortion" patented technology
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System and method for digital memorized predistortion for wireless communication
ActiveUS6985704B2Error preventionModulated-carrier systemsAudio power amplifierWireless transmission
An embodiment of the invention is a system for signal processing in preparation for wireless transmission, the wireless transmission being from a portable wireless communication device and including use of a power amplifier having nonlinear characteristics. The system includes memory for storing digitally-indexed information. The digitally-indexed information models nonlinear characteristics of the power amplifier, and the digitally-indexed information is stored prior to processing of a first signal that reflects information to be communicated. The system further includes first logic, configured to accept the first signal and to retrieve, based on the first signal, a portion of the digitally-indexed information stored in the memory, and second logic, configured to generate a second signal based on the portion of the digitally-accessed information and on the first signal. The second signal pre-compensates for the nonlinear characteristics of the power amplifier, and the second signal is for wireless transmission based on the second signal.
Owner:DALI WIRELESS
Digital Hybrid Mode Power Amplifier System
InactiveUS20080265996A1High performance and cost-effectiveImprove linearityAmplifier modifications to reduce non-linear distortionHigh frequency amplifiersPeak valueMulti carrier
A RF-digital hybrid mode power amplifier system for achieving high efficiency and high linearity in wideband communication systems is disclosed. The present invention is based on the method of adaptive digital predistortion to linearize a power amplifier in the RF domain. The power amplifier characteristics such as variation of linearity and asymmetric distortion of the amplifier output signal are monitored by the narrowband feedback path and controlled by the adaptation algorithm in a digital module. Therefore, the present invention could compensate the nonlinearities as well as memory effects of the power amplifier systems and also improve performances, in terms of power added efficiency, adjacent channel leakage ratio and peak-to-average power ratio. The present disclosure enables a power amplifier system to be field reconfigurable and support multi-modulation schemes (modulation agnostic), multi-carriers and multi-channels. As a result, the digital hybrid mode power amplifier system is particularly suitable for wireless transmission systems, such as base-stations, repeaters, and indoor signal coverage systems, where baseband I-Q signal information is not readily available.
Owner:DALI SYST LTD
Remote radio head unit system with wideband power amplifier and method
ActiveUS20110158081A1Improve performanceCost is economizedAmplifiers with memory effect compensationAmplifier with control circuitsMulti bandAudio power amplifier
A remote radio head unit (RRU) system for multiple operating frequency bands, multi-channels, driven by a single or more wide band power amplifiers. More specifically, the present invention enables multiple-bands RRU to use fewer power amplifers in order to reduce size and cost of the multi-band RRU. The present invention is based on the method of using duplexers and / or interference cancellation system technique to increase the isolation between the transmitter signal and receiver signal of the RRU.
Owner:DALI SYST LTD
Adaptive predistortion linearized amplifier system employing selective sampling
ActiveUS20060232332A1Reduce in quantityAmplifier modifications to reduce noise influenceAmplifier modifications to reduce temperature/voltage variationAudio power amplifierLinearity
An adaptive predistortion linearized amplifier system employing selective sampling is disclosed. Two selective sampling methods of identifying valid measurements using information from the input signal are disclosed. The selective sampling process improves the convergence properties of tuning algorithms based on minimizing the gain error variance. It also reduces the number of data samples processed by the estimator used in the tuning process.
Owner:INTEL CORP
Envelope tracking system for MIMO
There is disclosed an amplifier arrangement comprising a plurality of amplifiers each arranged to amplify one of a plurality of different input signals, the arrangement comprising an envelope tracking modulator for generating a common power supply voltage for the power amplifiers, and further comprising an envelope selector adapted to receive a plurality of signals representing the envelopes of the plurality of input signals, and adapted to generate an output envelope signal representing the one of the plurality of envelopes having the highest level at a particular time instant as the input signal for the envelope tracking modulator.
Owner:SNAPTRACK
System and method for digital memorized predistortion for wireless communication
InactiveUS8326238B2Error preventionModulated-carrier systemsWireless transmissionAudio power amplifier
Owner:DALI WIRELESS
System and method for digital memorized predistortion for wireless communication
InactiveUS20060046665A1Error preventionModulated-carrier systemsAudio power amplifierWireless transmission
An embodiment of the invention is a system for signal processing in preparation for wireless transmission, the wireless transmission being from a portable wireless communication device and including use of a power amplifier having nonlinear characteristics. The system includes memory for storing digitally-indexed information. The digitally-indexed information models nonlinear characteristics of the power amplifier, and the digitally-indexed information is stored prior to processing of a first signal that reflects information to be communicated. The system further includes first logic, configured to accept the first signal and to retrieve, based on the first signal, a portion of the digitally-indexed information stored in the memory, and second logic, configured to generate a second signal based on the portion of the digitally-accessed information and on the first signal. The second signal pre-compensates for the nonlinear characteristics of the power amplifier, and the second signal is for wireless transmission based on the second signal.
Owner:DALI WIRELESS
Amplifier linearization using non-linear predistortion
InactiveUS20050111575A1Reduce complexityFast convergenceAmplifier modifications to reduce non-linear distortionAmplitude adaptive predistortionNonlinear filterAudio power amplifier
Apparatus for amplifying an input signal having an input signal power includes a power amplifier, which is adapted to amplify an intermediate signal so as to generate an output signal, and which is characterized by a non-linearity. A non-linear filter is coupled to decompose the input signal into a series of input signal components, each such component proportional to a product of the input signal by a respective integer power of the input signal power, and is adapted to filter the signal components responsively to the non-linearity so as to generate the intermediate signal for input to the power amplifier.
Owner:POWERWAVE TECH S A R L +1
Adaptive predistortion linearized amplifier system employing selective sampling
ActiveUS7288988B2Reduce in quantityAmplifier modifications to reduce noise influenceAmplifier modifications to reduce temperature/voltage variationAudio power amplifierSelf adaptive
An adaptive predistortion linearized amplifier system employing selective sampling is disclosed. Two selective sampling methods of identifying valid measurements using information from the input signal are disclosed. The selective sampling process improves the convergence properties of tuning algorithms based on minimizing the gain error variance. It also reduces the number of data samples processed by the estimator used in the tuning process.
Owner:INTEL CORP
Transmitter circuit and method for modulation distortion compensation
ActiveUS20050130609A1Amplifier modifications to reduce non-linear distortionResonant long antennasAudio power amplifierControl data
A transmitter circuit (200, 400, 510) and method reduces amplitude modulation distortion in an amplifier (210). The transmitter circuit (200, 400, 510) includes a power control error data generator (230), a feedforward predistortion data generator (240), feedforward adder logic (250) and the amplifier (210). The power control error data generator (230) receives amplitude modulation data (252) and an RF coupled output signal (254) and, in response, produces power control error data (256). The feedforward predistortion data generator (240) receives the amplitude modulation data (252) and, in response, produces feedforward predistortion data (258). The feedforward adder logic (250) receives the power control error data (256) and the feedforward predistortion data (258) and, in response, produces power control data (260). The amplifier (210) receives the power control data (260) and an RF input signal (261) and, in response, produces an RF output signal (262), such that the power control data (260) reduces amplitude modulation distortion in the RF output signal (262).
Owner:GOOGLE TECH HLDG LLC
Remote radio head unit system with wideband power amplifier and method
ActiveUS8730786B2Improve performanceCost is economizedAmplifiers with memory effect compensationAmplifier with control circuitsMulti bandAudio power amplifier
A remote radio head unit (RRU) system for multiple operating frequency bands, multi-channels, driven by a single or more wide band power amplifiers. More specifically, the present invention enables multiple-bands RRU to use fewer power amplifiers in order to reduce size and cost of the multi-band RRU. The present invention is based on the method of using duplexers and / or interference cancellation system technique to increase the isolation between the transmitter signal and receiver signal of the RRU.
Owner:DALI SYST LTD
Signal Predistortion for Non-Linear Amplifier
ActiveUS20140292406A1Amplifier modifications to reduce non-linear distortionAmplifiers with memory effect compensationAudio power amplifierNonlinear amplifier
A method, apparatus, and computer program for modeling mathematically an effect of a plurality of factors on signal distortion caused by a non-linear amplifier are provided. First, there is computed a global model which incorporates a combined effect of the plurality of factors on signal distortion caused by the non-linear amplifier. Before applying the pre-distorted transmission signal to the non-linear amplifier, a transmission signal is pre-distorted with coefficients derived from the global model thus compensating for the signal distortion caused by the non-linear amplifier.
Owner:RPX CORP
Control system for a power amplifier
ActiveUS20150054582A1Minimise measured powerMinimize powerAmplifier modifications to reduce non-linear distortionHigh frequency amplifiersAudio power amplifierPhase difference
An apparatus for controlling the gain and phase of an input signal input to a power amplifier comprises a gain control loop configured to control the gain of the input signal based on power levels of the input signal and an amplified signal output by the power amplifier, to obtain a predetermined gain of the amplified signal, and a phase control loop configured to obtain an error signal related to a phase difference between a first signal derived from the input and a second signal derived from the amplified signal, and control the phase based on the error signal, to obtain a predetermined phase of the amplified signal. The phase control loop delays the first signal, such that the delayed first signal and the second signal used to obtain the error signal correspond to the same part of the input signal. The apparatus may be included in a satellite.
Owner:ASTRIUM GMBH
Signal extraction circuit and distortion-compensated amplifier incorporating the same
InactiveUS7456688B2Excellent distortion compensating characteristicRemove distortionAmplifier modifications to reduce non-linear distortionNegative-feedback-circuit arrangementsAudio power amplifierAcoustics
To cancel a reflected wave reflected from a connecting portion (22) and leaking into a feedback signal when a non-matched component is connected, the reflected wave is extracted by a circulator (30) and its phase and amplitude are adjusted by a vector adjusting circuit (32), and then the thus adjusted reflected wave is vector-summed with the feedback signal in a vector sum circuit (34).
Owner:FUJITSU LTD
Distortion compensating amplifier
InactiveUS20050101254A1Distortion compensationExcellent characteristicsAmplifier modifications to reduce non-linear distortionAmplitude adaptive predistortionAudio power amplifierDistortion
Disclosed is a distortion compensating amplifier having a distortion compensator for compensating for distortion of an amplifier by updating distortion compensation coefficients so as to null a difference between a transmit signal and a feedback signal, and subjecting the transmit signal to distortion compensation processing using the distortion compensation coefficients, an amplifier for amplifying the transmit signal, which has undergone distortion compensation, in order to transmit the signal from an antenna, and a feedback unit for inputting an output signal from the amplifier to a distortion compensation coefficient updater in the distortion compensator as the feedback signal. Whether the level of an unwanted-wave signal that penetrates the amplifier from space via an antenna is greater than a set level is monitored. If the level of the unwanted-wave signal is above the set level, processing for updating distortion compensation coefficients is suspended. If the level of the unwanted-wave signal is below the set level, then processing for updating distortion compensation coefficients is resumed.
Owner:FUJITSU LTD
Polynomial power amplifier modeling and digital pre-distorting method based on segmented memory
ActiveCN104796091AImprove linearityImprove modeling accuracyAmplifier modifications to reduce non-linear distortionPower amplifiersAudio power amplifierDecomposition
The invention discloses a polynomial power amplifier modeling and digital pre-distorting method based on a segmented memory. By means of a vector threshold decomposition technique, the modeling method comprises the steps that an original input signal of a power amplifier is disassembled to be a plurality of sub-signals, memory polynomial expansion is conducted on the sub-signals, and expansion results are merged to serve as a final output signal of the power amplifier; the digital pre-distorting method comprises the steps that a digital predistortor is constructed based on the modeling, and linear processing is conducted on the power amplifier. By means of the modeling method, non-linear characteristics of the wideband radio frequency power amplifier can be described accurately, and the degree of linearity of the wideband radio frequency power amplifier is effectively improved by means of the corresponding digital pre-distorting method.
Owner:NANJING UNIV OF SCI & TECH
Distortion compensating amplifier
InactiveUS7415250B2Distortion compensationExcellent characteristicsAmplifier modifications to reduce non-linear distortionAmplitude adaptive predistortionSoftware engineeringMechanical engineering
Disclosed is a distortion compensating amplifier having a distortion compensator for compensating for distortion of an amplifier by updating distortion compensation coefficients so as to null a difference between a transmit signal and a feedback signal, and subjecting the transmit signal to distortion compensation processing using the distortion compensation coefficients, an amplifier for amplifying the transmit signal, which has undergone distortion compensation, in order to transmit the signal from an antenna, and a feedback unit for inputting an output signal from the amplifier to a distortion compensation coefficient updater in the distortion compensator as the feedback signal. Whether the level of an unwanted-wave signal that penetrates the amplifier from space via an antenna is greater than a set level is monitored. If the level of the unwanted-wave signal is above the set level, processing for updating distortion compensation coefficients is suspended. If the level of the unwanted-wave signal is below the set level, then processing for updating distortion compensation coefficients is resumed.
Owner:FUJITSU LTD
Digital hybrid mode power amplifier system
InactiveUS8811917B2High performance and cost-effectiveImprove linearityHigh frequency amplifiersPower amplifiersPower amplifier linearizationCarrier signal
Owner:DALI SYST LTD
Envelope tracking system for MIMO
ActiveUS20130049858A1Minimize distortionPower managementSpatial transmit diversityAudio power amplifierEnvelope Tracking
There is disclosed an amplifier arrangement comprising a plurality of amplifiers each arranged to amplify one of a plurality of different input signals, the arrangement comprising an envelope tracking modulator for generating a common power supply voltage for the power amplifiers, and further comprising an envelope selector adapted to receive a plurality of signals representing the envelopes of the plurality of input signals, and adapted to generate an output envelope signal representing the one of the plurality of envelopes having the highest level at a particular time instant as the input signal for the envelope tracking modulator.
Owner:SNAPTRACK
Amplifier linearization using non-linear predistortion
InactiveUS7330517B2Fast convergenceEasy to operateAmplifier modifications to reduce non-linear distortionAmplitude adaptive predistortionNonlinear filterAudio power amplifier
Apparatus for amplifying an input signal having an input signal power includes a power amplifier, which is adapted to amplify an intermediate signal so as to generate an output signal, and which is characterized by a non-linearity. A non-linear filter is coupled to decompose the input signal into a series of input signal components, each such component proportional to a product of the input signal by a respective integer power of the input signal power, and is adapted to filter the signal components responsively to the non-linearity so as to generate the intermediate signal for input to the power amplifier.
Owner:POWERWAVE TECH S A R L +1
Pa cell, pa module, wireless communication unit, RF transmitter architecture and method therefor
ActiveUS20140254720A1Mitigate, alleviate or eliminate one orReduce silicon areaAmplifier modifications to reduce non-linear distortionModulated-carrier systemsAudio power amplifierCommunication unit
A power amplifier cell includes a first input arranged to receive an in-phase control signal, a second input arranged to receive a quadrature control signal, an input stage arranged to output a drive signal based at least partly on the received in-phase and quadrature control signals, and an output stage arranged to receive at an input thereof the drive signal output by the input stage, and to generate an output signal for the power amplifier cell in response to the received drive signal.
Owner:MEDIATEK SINGAPORE PTE LTD SINGAPORE
Calculating method of digital pre-distortion parameters and pre-distortion system
ActiveCN103685111AGuaranteed Signal Processing PerformanceSimplify the computational complexityAmplifier modifications to reduce non-linear distortionAmplifiers with memory effect compensationReduced modelComputation complexity
The invention discloses a calculating method of digital pre-distortion parameters and a pre-distortion system and relates to the field of digital pre-distortion processing. The calculating method of digital pre-distortion parameters and the pre-distortion system are used for achieving a good signal processing effect and simplifying calculating complexity of models. The calculating method of digital pre-distortion parameters includes: acquiring pre-distortion signals already subjected to pre-distortion processing and first feedback signals already subjected to power amplifying processing after periodic processing starts; performing rated linear gain eliminating on the first feedback signals to obtain second feedback signals; determining pre-distortion parameters according to a matrix formed by the second feedback signals and a matrix formed by the pre-distortion signals; updating a pre-distortion parameter index table according to the determined pre-distortion parameters.
Owner:DATANG MOBILE COMM EQUIP CO LTD
Distortion compensation circuit and transmission device using distortion compensation circuit and high-frequency power amplifier
ActiveUS20150236655A1Easy to manufactureShort timeAmplifier modifications to reduce non-linear distortionAmplifiers with memory effect compensationHigh frequency powerAudio power amplifier
The purpose of the invention is to reduce Cartesian loop transmission delay for compensating the distortion occurring in a high-frequency power amplifier and make the distortion compensation converge quickly, thereby increasing the efficiency. A transmission device has: a high-frequency power amplifier; a pre-distortion compensation circuit for independently generating the coefficients of the distortion compensation signal for each order of the odd and even symmetric distortions of the high-frequency power amplifier; a means for varying the power supply voltage of the high-frequency power amplifier with an orthogonal modulation OFDM input signal; a digital frequency converter; a high-frequency band ADC; and a high-frequency band DAC. In the transmission device, an error distortion compensation signal is created from the output of the high-frequency power amplifier and the orthogonal modulation OFDM input signal, and a delay device is inserted at the previous stage of a distortion compensation circuit, said delay device having a delay equivalent to a time constant for varying the power supply voltage of the high-frequency power amplifier with the orthogonal modulation OFDM input signal.
Owner:KOKUSA ELECTRIC CO LTD
Systems and Methods for Adaptive Power Amplifier Linearization
ActiveUS20130082775A1Reduce distortion problemsAmplifier modifications to reduce non-linear distortionAmplifier modifications to reduce noise influenceAudio power amplifierControl signal
An exemplary system comprises a linearizer, a power amplifier, and a feedback block. The linearizer may be configured to use a predistortion control signal to add predistortion to a receive signal to generate a predistorted signal. The power amplifier may be configured to amplify power of the predistorted signal to generate a first amplified signal. The power amplifier may also add high side and low side amplifier distortion to the predistorted signal. The high side and low side amplifier distortion may cancel at least a portion of the predistortion. The feedback block may be configured to capture a feedback signal based on a previous amplified signal from the power amplifier, to determine high side and low side distortion of the captured feedback signal, and to generate the predistortion control signal based on the determined high side and low side distortion.
Owner:AVIAT U S
MRAM-Based Pre-Distortion Linearization and Amplification Circuits
ActiveUS20160336906A1Amplifier modifications to reduce non-linear distortionGalvano-magnetic amplifiersAudio power amplifierNon linear behavior
A circuit has a magnetic device to produce a pre-distorted signal from a sinusoidal input signal. The magnetic device has physical attributes selected to produce characteristics of the pre-distorted signal. A power amplifier is coupled to the magnetic device. The power amplifier processes the pre-distorted signal to produce an output signal with reduced nonlinear behavior associated with the power amplifier.
Owner:CROCUS TECHNOLOGY
Distortion compensation apparatus and method
InactiveCN101753105AAmplifier modifications to reduce non-linear distortionModulated-carrier systemsDistortionPower Fluctuation
A distortion compensation apparatus includes a distortion compensation unit that performs distortion compensation processing on a transmission signal by a series operation, a coefficient update unit that updates a group of series operation coefficients used for the series operation based on a feedback signal of transmission signal output that is output after power amplification processing is performed on output of the distortion compensation unit and the transmission signal, an initial coefficient memory that stores the groups of series operation coefficients that become initial values for coefficient update processing by the coefficient update unit, and a power fluctuation detection unit that detects a power fluctuation of the transmission, signal and, when the power fluctuation is detected, reads the groups of series operation coefficients from the initial coefficient memory and provides the groups of series operation coefficients to the coefficient update unit.
Owner:FUJITSU LTD
Transmitter circuit and method for modulation distortion compensation
ActiveUS7116951B2Amplifier modifications to reduce non-linear distortionResonant long antennasAudio power amplifierControl data
Owner:GOOGLE TECHNOLOGY HOLDINGS LLC
Distortion-compensating power amplifier and method for compensating for distortion to amplify power
InactiveUS20160118946A1Reduce distractionsAmplifier modifications to reduce non-linear distortionAmplifier details to increase power/efficiencyNonlinear distortionAudio power amplifier
A distortion-compensating power amplifier compensates for nonlinear distortion in a power amplifier. The distortion-compensating power amplifier includes: a predistorter that performs pre-distortion processing, the pre-distortion processing applying an inverse characteristic of a distortion characteristic that is generated in the power amplifier to an input signal; a filter that performs band limitation on the pre-distorted input signal by using a frequency characteristic that is asymmetric with respect to a center frequency of the input signal, the filter having a filter coefficient that is a complex number; a down-sampler that down-samples the band-limited input signal; and a digital-to-analog converter that converts the down-sampled input signal from a digital signal to an analog signal.
Owner:PANASONIC CORP
Capture buffer of digital predistortion systems
ActiveUS20140333377A1Amplifier modifications to reduce non-linear distortionAmplifier modifications to reduce noise influenceAudio power amplifierEngineering
An improved DPD system includes a predistortion module having at least one predistortion function. The predistortion module is configured to receive and subsequently process a baseband signal. The system also includes a power amplifier configured to receive the processed baseband signal from the predistortion module. The system further includes a model calculator configured to program priorities for predistortion functions so that the processed baseband signal transmitted from the predistortion module corresponds to the transmission power of the power amplifier. The model calculator is further configured to send a trigger signal to indicate when data capture from the power amplifier should begin so as to update the predistortion functions. A trigger module in the system is configured to receive the trigger signal and to initiate data capture from the power amplifier upon receipt of the trigger signal.
Owner:ZTE WISTRON TELECOM +1
Pre-distortion method and associated apparatus and non-transitory machine readable medium
ActiveUS20150015328A1Amplifier modifications to reduce non-linear distortionAmplifier with control circuitsAudio power amplifierComputer science
A pre-distortion method includes: receiving an input data; and obtaining a pre-distorted output by inputting the input data into a pre-distortion function, wherein the pre-distortion function is determined according to a power amplifier. A pre-distortion apparatus includes a receiver and a pre-distortion unit. The receiver is utilized for receiving an input data. The pre-distortion unit is utilized for obtaining a pre-distorted output by inputting the input data into a pre-distortion function, wherein the pre-distortion function is determined according to a following power amplifier. A non-transitory machine readable medium stores a program code executed for performing steps of the proposed pre-distortion method.
Owner:REALTEK SEMICON CORP
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