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60 results about "Power amplifier linearization" patented technology
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Power amplifier linearization
ActiveUS7313199B2Simple signal processing circuitReduce time delayAmplifier modifications to reduce non-linear distortionSecret communicationPower amplifier linearizationHigh power amplifier
A system for linearizing the output of a high power amplifier (HPA) designed to transmit an RF modulated signal includes in its transmit section a digital up-converter for processing baseband input signals and generating a desired digital RF waveform, T(s). The desired digital RF waveform T(s) is then fed to a digital predistorter circuit for producing a predistorted digital RF waveform P(s)T(s) which, as modified, may be applied via a high sampling speed high linearity digital to analog converter to the high power amplifier (HPA) to produce an output signal which is a linear function of the baseband input signal. The digital predistorter circuit may be of the adaptive type or of the predictive type. Circuits embodying the invention may include encoding circuitry for converting multi-bit signals to a serial stream of single-bit pulses for enabling simplification in the digital to analog conversion. In accordance with the invention, corrections for non-linearity of the HPA may be made directly on the RF waveform using ultra-high speed superconducting electronics (SCE) and decreasing the time delay between sensing a transmitted signal and generating a correcting (linearizing) signal.
Owner:HYPRES
Power amplifier linearization methods and apparatus using predistortion in the frequency domain
To mitigate the effects of non-linear amplification in a digital transmission system employing a multi-carrier multiplexing communications technique, such as orthogonal frequency division multiplexing or discrete multi-tone, predistortion of an input signal to a power amplifier with a non-linear transfer characteristic is performed in the frequency domain by modifying frequency-domain symbols used to modulate individual sub-carriers. The frequency-domain symbols are modified in a manner that compensates for the amplifier's non-linear transfer characteristic.
Owner:APPLE INC
Scanning receiver for use in power amplifier linearization
InactiveUS7167693B2Error preventionFrequency-division multiplex detailsAudio power amplifierPower amplifier linearization
Owner:ANDREW LLC
Power amplifier linearization method and device based on baseband digital predistortion technology
InactiveCN102231620AReduce computationHigh precisionAmplifier modifications to reduce non-linear distortionSynchronous/start-stop systemsAudio power amplifierPower amplifier linearization
The invention discloses a power amplifier linearization method based on a baseband digital predistortion technology, comprising the following steps of: calculating an instantaneous amplitude Ai and an instantaneous phase theta i of an input baseband signal; respectively searching out a pre-distorted signal amplitude Bi and a pre-distorted phase offset phi i by regarding the instantaneous amplitude Ai as an indexed address of a predistortion lookup table; calculating a pre-distorted signal and then outputting the pre-distorted signal for up-conversion treatment and analogue-to-digital conversion; and finally sending the signal to a power amplifier. During the predistortion, an output signal of the power amplifier is obtained and converted into a baseband feedback signal via a feedback path; and the predistortion lookup table is self-adaptively updated by using the baseband feedback signal and a desired signal. The invention also discloses a predistortion lookup table initialization method matched with the linearization method disclosed by the invention and a linearization device based on the linearization method. The method disclosed in the invention directly adopts signal amplitude as the indexed address of a predistortion lookup table to obtain predistortion signal simply, which not only reduces the treatment relay of the system and the system load, but also reduces the device complexity and the control complexity of the system.
Owner:刘郁林 +2
Power amplifier linearization correcting circuit and method based on multi-channel feedback
ActiveCN102055411ASolve problems that are difficult to achieve high linearityAmplifier modifications to reduce non-linear distortionPower amplifiersNonlinear distortionFrequency spectrum
The invention discloses a power amplifier linearization correcting circuit and method based on multi-channel feedback, relates to a linearization technology in the technical field of communication, and aims to provide a power amplifier linearization correcting circuit and method capable of self-adaptively regulating a predistortion parameter of a system by tracking the linearization characteristic of a radio frequency power amplifier. The power amplifier linearization correcting method is technically characterized in that a signal output by a power amplifier is subjected to frequency spectrumdivision and is coupled to a feedback system by utilizing a plurality of paths of channels; a data recovery circuit recovers a plurality of paths of feedback information to form a path of signal; a predistortion trainer calculates the predistortion parameter by utilizing a baseband signal and a recovered feedback signal; a predistortion trainer A adds a predistortion signal complementing a nonlinear distorted signal of the power amplifier according to the predistortion parameter; and the predistortion signal in the baseband signal is counteracted in the power amplifier, thereby realizing the linearization correction of the power amplifier. The invention is mainly used for nonlinear predistortion correction of a radio frequency signal emission system.
Owner:CHENGDU KAITENG SIFANG DIGITAL RADIO & TELEVISION EQUIP CO LTD
Adaptive power amplifier linearization in time division duplex communication systems
ActiveUS7529524B1Resonant long antennasNegative-feedback-circuit arrangementsCommunications systemTransceiver
In an aspect of the invention, a method is performed in a transceiver for adaptive power amplifier linearization in time division duplex communication systems. The method comprises, in response to a first condition, performing, using a feedback signal generated by receiving subsystem circuitry, adaptive power amplifier linearization on a signal to be transmitted. The method additionally comprises, in response to a second condition, performing operations in order to determine receive data from a received radio frequency (RF) signal. The operations use at least the receiving subsystem circuitry. In a further aspect of the present invention, a transceiver is disclosed.
Owner:REDSTONE LOGICS LLC
Digital pre-distortion for the linearization of power amplifiers with asymmetrical characteristics
InactiveUS7251293B2Amplifier modifications to reduce non-linear distortionAmplifier modifications to reduce noise influencePower amplifier linearizationEngineering
An input signal is pre-distorted to reduce spurious emissions resulting from subsequent signal amplification. Frequency-dependent pre-distortion is preferably implemented in combination with frequency-independent pre-distortion, where the frequency-dependent pre-distortion corresponds to amplifier distortion that has a magnitude that is proportional to the frequency offset from the carrier frequency and a ±90° phase shift on either side of the carrier frequency. The frequency-dependent pre-distortion is generated by differentiating waveforms corresponding to two different sets of pre-distortion parameters with respect to time. In one embodiment, one of the differentiated waveforms is applied to a positive-frequency filter and the other to a negative-frequency filter to generate positive- and negative-frequency pre-distortion signals, respectively, to account for asymmetries in the amplifier characteristics. In another embodiment, only one of the differentiated waveforms is applied to an asymmetric filter (i.e., either a positive-frequency filter or a negative-frequency filter).
Owner:COMMSCOPE TECH LLC
Predistorter for Linearization of Power Amplifier
InactiveUS20070182485A1Suitable for integrationReduce power consumptionAmplifier modifications to reduce noise influenceAmplifier modifications to reduce temperature/voltage variationAudio power amplifierPower amplifier linearization
A predistorter for the linearization of a power amplifier is provided. The predistorter can incorporate a field effect transistor (FET), which permits a design having low power consumption and broad band characteristics. The predistorter can be appropriate for integration with the power amplifier, unlike the conventional predistorters, because the subject predistorter does not significantly increase the size and complexity of the wireless system. In an embodiment, the subject predistorter can be coupled with a gate bias circuit of a power amplifier. When the predistorter is coupled with the gate bias of a power amplifier, the predistorter can function as linearizer as well as an adaptive gate bias circuit.
Owner:KO SANG WON
Hybrid polar modulator differential phase Cartesian feedback correction circuit for power amplifier linearization
ActiveUS7409004B2Accurate estimateAmplifier modifications to reduce non-linear distortionMemory effect compensationAmplitude distortionAudio power amplifier
The present invention, generally speaking, provides a method of obtaining very accurate estimates of the phase and amplitude distortions introduced by radio frequency or microwave power amplifiers even where polar modulation is used.
Owner:APPLE INC
Method and system for realizing self-adaptive predistortion power amplifier linearization
ActiveCN101789920AFast convergenceImprove convergence accuracyMulti-frequency code systemsSynchronous/start-stop systemsPower amplifier linearizationEngineering
The invention relates to a method and a system for realizing the self-adaptive predistortion power amplifier linearization. The system comprises an OFDM base band signal module, a self-adaptive digital predistortion module, an DAC, a radio frequency transmitter, a PA, an antenna, a directional coupler, a radio frequency receiving machine and an ADC, wherein the self-adaptive digital predistortionmodule also comprises a mixing self-adaptive algorithm engine, the mixing self-adaptive algorithm engine is used for generating a correction factor of a digital predistortion device by using RLS and PSO self-adaptive algorithm according to expected signals and feedback signals of the ADC and sending the correction factor to the digital predistortion device, wherein the expected signals are base band signals output by the digital predistortion device. When the method and the system of the invention are adopted, the convergence speed can be accelerated, the convergence precision can be improved, and at the same time, the system cost can be lowered.
Owner:WUHAN HONGXIN TELECOMM TECH CO LTD
Power amplifier linearization methods and apparatus using predistortion in the frequency domain
Owner:APPLE INC
Power amplifier linearization using digital predistortion
InactiveUS8326239B1Avoid output signal distortionMaintaining transmit （TX） powerTransmission monitoringAmplitude modulationFrequency changerPhase noise
Predistortion may be employed to avoid distortion in the output of a power amplifier (PA) in a transmitter, while maintaining transmit power. An active transmission signal, instead of test tones, may be used for training a predistorter for the PA, and for the entire analog transmit path of the transmitter, via a loopback path from the output of the PA to the input of a receiver path. The transmitter may include an upconverter, and the receive path may include a downconverter, which may therefore both be included in the loopback path, helping eliminate phase noise. The predistortion training may incorporate fractional timing correction, to properly align the amplified version of the original TX signal received via the loopback path with the original TX signal. The transfer function of the PA may be estimated as a polynomial function, obtaining the coefficients of the polynomial function using adaptation techniques according to one of a number of possible different methods, e.g. through curve fitting using a least mean square (LMS) algorithm.
Owner:QUALCOMM INC
Memory polynomial digital pre-distortion method based on piecewise linear function
InactiveCN106453172AAdjacent channel power ratio improvementImprove performanceAmplifier modifications to reduce non-linear distortionPower amplifiersAudio power amplifierPower amplifier linearization
The invention relates to the technology of digital pre-distortion, provides a novel digital pre-distortion structure, and achieves a good effect in the linearization of a power amplifier. According to the technical scheme, a memory polynomial digital pre-distortion method based on a piecewise linear function includes: the input of a pre-distortion module is y(n) / G, and the output is the conjugate of z(n), and G is the gain of the power amplifier. An input signal is x(n), the input signal passes through a structure which is the same with the pre-distortion module to generate an output signal z(n), e(n)=z(n)-the conjugate of z(n), e(n) is minimized by employing the recursive least squares algorithm iteration, and the signal is linearly amplified. The method is mainly applied to linearization occasions of the power amplifiers.
Owner:TIANJIN UNIV
Scanning receiver for use in power amplifier linearization
InactiveUS20050032485A1Error preventionFrequency-division multiplex detailsAudio power amplifierPower amplifier linearization
A feed forward power amplifier system and method identify active channels across a frequency band to suppress unwanted intermodulation distortion (IMD) products in a communications signal such as a single- or multi-carrier communications signal. A scanning receiver identifies at least one active channel in a frequency band, and identifies at least one portion of the frequency band likely to include IMD products based upon the identified active channel(s). Based upon the identified portion of the frequency band, IMD products are suppressed from the communications signal, e.g., by controlling the magnitude and / or phase of a suppression signal mixed with the communications signal.
Owner:ANDREW LLC
Power amplifier linearization method and linear power amplifier device
InactiveCN1516493AAchieve the effect of linear power amplificationGood effectTransmission control/equalisingAmplifier modifications to reduce detrimental impedenceNonlinear distortionFrequency spectrum
The invention relates to a kind of linearization method of power amplifier in signal process field, the invention acquires the enveloped spectrum information of nonlinear distorted signal of power amplifier from front feedback signal counteraction loop, and feedbacks then to the input channel of power amplifier through degenerative feedback loop, and superimposes and modulates the enveloped spectrum, with the input signal, and forms the input signal pre-skewness, realizes the linear amplification of power amplifier. The device includes front feedback signal counteraction model, nonlinear skewness enveloped spectrum degenerative feedback model which is the enveloped spectrum information acquired from the front feedback signal counteraction model, and feedbacks it to the input channel of the power amplifier to be modulated into the enveloped spectrum.
Owner:ZTE CORP
Digital hybrid mode power amplifier system
InactiveUS8811917B2High performance and cost-effectiveImprove linearityHigh frequency amplifiersPower amplifiersPower amplifier linearizationCarrier signal
Owner:DALI SYST LTD
Radio-frequency power amplifier linearization system based on broadband modulator
ActiveCN104219182AImprove nonlinear compensation effectHigh out-of-band rejectionSynchronous/start-stop systemsOut of band rejectionCompensation effect
Owner:SHANGHAI SPACEFLIGHT ELECTRONICS & COMM EQUIP RES INST
Baseband pre-distortion power amplifier linearization method based on one-way feedback and non-iterative technique
InactiveCN101764577ASmall amount of calculationImprove computing efficiencyAmplifier modifications to reduce non-linear distortionLinear growthAudio power amplifier
The invention discloses a baseband pre-distortion power amplifier linearization method based on one-way feedback and a non-iterative technique, belonging to the technical field of electronics and relating to a power amplifier linearization technique. Two orthogonal training sequences of linearly increased amplitudes are input into a power amplifier successively, and an improved look-up table is constructed by an I path feedback signal sequence output by power amplifier; the input signals of the whole power amplifier system calculates and looks for corresponding look-up table values by the amplitudes, then corresponding pre-distortion process is carried out on the I path and Q path baseband input signals, and the input signals after pre-distortion are output to the power amplifier after D / A conversion, filtration and up-conversion, thus obtaining the output signals which show linear amplification with the baseband input signals of the whole power amplifier system. The whole pre-distortion process can be realized in a digital processing chip (comprising DSP or FPGA). Compared with the prior art, the method does not need arctangent or inverse cosine calculation and does not need coordinate transformation, thus reducing calculation amount, increasing calculation efficiency and ensuring the system structure to be simpler.
Owner:UNIV OF ELECTRONICS SCI & TECH OF CHINA
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
Power amplifier linearization using RF feedback
InactiveUS20100060353A1Improve linearityImprove efficiencyAmplifier modifications to reduce non-linear distortionTransmission hybrid circuitsHybrid couplerAudio power amplifier
The power amplifier mainly includes a main amplifier, two splitters, one combiner, one subtracter, two phase shifters, one attenuator and one error amplifier. The splitters, subtracter and combiner are designed in the form of 90-degree or quadrature hybrid couplers. A quadrature hybrid can be implemented with any lumped or transmission-line elements and has an important advantage compared to the in-phase splitter that at equal values of reflection coefficients from loads connected to the in phase and 90° phase shift terminals, the reflection wave is lacking at the main input terminal and, consequently, the input voltage standing wave ratio of a quadrature hybrid does not depend on the equal load mismatch level.
Owner:RPX CORP
Method for realizing memory-type power amplifier linearization and its baseband predistortion device
InactiveCN1731673AReduce computationReduce implementation complexityAmplifier modifications to reduce non-linear distortionPower amplifiersPower amplifier linearizationEngineering
The invention discloses a method for realizing memory-type power amplifier linearization and its baseband predistortion device. The method firstly obtains a loop delay and a parameter of the memoryless predistortion unit by a narrow band training sequence with a specific frame structure and a corresponding self-adaptive algorithm, then compensates the memory effect of the power amplifier when transmitting the broad band signals by an equalizer and an equalizing arithmetic. The base band predistortion device comprises a narrow band training sequence generating unit, a self-adaptive memoryless predistorter, a self-adaptive equalizer. The output of the narrow band training sequence generating unit is fed to the memoryless predistortion unit, modifies the parameters of the memoryless predistortion unit by the self-adaptive algorithm, inputs the broad band signal sequence to the self-adaptive equalizer after the algorithm is convergent, modifies the parameter of the equalizer to compensate the memory effect of the power amplifier. The invention has a low computation, which is easy to realize and suitable for correcting the non-linear property of the power amplifier with the memory effect and the common power amplifier.
Owner:XIDIAN UNIV
Power amplifier linearization method and apparatus
ActiveUS20120086507A1Effectively linearizingAmplifiers with memory effect compensationAmplifier modifications to reduce noise influenceDigital signal processingAudio power amplifier
Disclosed is a method and apparatus for linearizing a power amplifier using a digital signal process (DSP), and particularly, is a method and apparatus for effectively linearizing an amplifier which has a plurality of distortion generating sources. To this end, there is a plurality of compensation methods and compensation units which can generate inverse distortion signals corresponding to the distortion components outputted by the plurality of distortion generating sources, thereby making it possible to provide superior linearity.
Owner:POSTECH ACAD IND FOUND
Self-adaptive digital pre-distortion method and system based on look-up table method
PendingCN106208985AGood linear outputTake up less resourcesAmplifier modifications to reduce non-linear distortionAmplifier with semiconductor-devices/discharge-tubesUltrasound attenuationAudio power amplifier
The invention relates to a self-adaptive digital pre-distortion method and system based on a look-up table method, and belongs to the technical field of digital pre-distortion. The self-adaptive digital pre-distortion system comprises a baseband signal module, a digital pre-distortion module, an upper frequency conversion channel, a power amplifier, a coupler, an attenuator and a lower frequency conversion channel, wherein the digital pre-distortion module consists of a self-adaptive algorithm engine, a look-up table module and a pre-distorter; the look-up table module controls an input signal u (n) of the baseband signal module to pass through the pre-distorter to obtain a pretreatment signal x (n); the pretreatment signal x (n) pass through the upper frequency conversion channel to obtain an output signal Vd (t); after the output signal Vd (t) is amplified by the power amplifier, an antenna transmits a signal Vo (t); the signal Vo (t) is subjected to coupling attenuation; a feedback signal y (n) is obtained by the lower frequency conversion channel; the self-adaptive algorithm is adopted to modify a pre-distortion compensating signal to realize linearization of the power amplifier adopting the digital pre-distortion technology. The self-adaptive digital pre-distortion method and system enable the linearization effect of the power amplifier to be more ideal and the implantation process is simple.
Owner:CHIZHOU RICHSEMI ELECTRONICS
Digital hybrid mode power amplifier system
ActiveCN101720528AAchieve self-regulationAmplifier modifications to reduce non-linear distortionPower amplifiersNon symmetricPower amplifier linearization
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
Linear transmission method based on plurality of antennae
InactiveCN106102156ANo problem of efficiencyRequirements for power amplifier linearity are reducedPower managementSpatial transmit diversityAudio power amplifierCommunication quality
The invention relates to a wireless communication technology, aims to solve the problem of influence on wireless communication quality since an existing power amplifier linearization technology has a relatively high requirement on branch consistency of a power amplifier and is difficult to implement in engineering practice, and provides a linear transmission method based on a plurality of antennae. The method comprises the following steps that: a transmitting end performs signal decomposition on a broadband modulation signal to be transmitted, decomposes a broadband modulation signal of a non-constant envelope into a plurality of paths of constant envelope signals, performs power amplification on the paths of constant envelope signals respectively, and transmits amplified signals corresponding to transmitting antennae respectively; and a receiving end receives the paths of constant envelope signals through a plurality of paths of receiving antennae respectively, performs power amplification on the paths of constant envelope signals, and performs linear synthesis on the amplified paths of constant envelope signals, wherein the number of the receiving antennae is the same as the number of the transmitting antennae. The method is suitable for a wireless communication system.
Owner:CHENGDU UNIVERSITY OF TECHNOLOGY
A pre-distorter and TD-SCDMA power amplification module using this predictive distorter
InactiveCN101079644AImprove linearityBroadband intermodulation productTransmissionLinear componentAudio power amplifier
The invention discloses a predistorter and TD-SCDMA power amplifier mode of predistorter, which is characterized by the following: reaching broad frequency intermodulation component at non-linear generator, broad output dynamic tracing scale, broad working band and good heat tracing main-power amplifier path; setting two circuits in the predistorter with the first circuit generating non-linear component to cancel the carrier component and the second circuit generating entire predistortion signal with original carrier component and needed non-linear component; obtaining better linear modification with power amplifier; fitting for wireless launcher power amplifier linear equipment domain.
Owner:SHANGHAI TUYUE ELECTRONICS CO LTD
Decorrelated power amplifier linearizers
InactiveUS7015751B2Amplifier modifications to reduce non-linear distortionAmplifier modifications to reduce noise influenceAudio power amplifierPower amplifier linearization
Procedures for decorrelating the branch signals of a signal adjuster of an amplifier linearizer are presented herein. The decorrelation procedures can be performed with or without self-calibration.
Owner:COMMSCOPE TECH LLC
Systems and methods for adaptive power amplifier linearization
ActiveUS8766718B2Negative-feedback-circuit arrangementsAmplifier modifications to reduce noise influenceAudio power amplifierControl signal
Owner:AVIAT U S
High efficiency, remotely reconfigurable remote radio head unit system and method for wireless communications
ActiveCN102870494AEnergy efficient ICTMultiple modulation transmitter/receiver arrangementsPower amplifier linearizationUnit system
A remote radio head unit (RRU) 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 inside the RRU. The power amplifier characteristics such as variation of linearity and asymmetric distortion of the amplifier output signal are monitored by a wideband feedback path and controlled by the adaptation algorithm in a digital module. Therefore, embodiments of the present invention can compensate for the nonlinearities as well as memory effects of the power amplifier systems and also improve performance, 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, multi-frequency bands and multi-channels. As a result, the remote radio head system is particularly suitable for wireless transmission systems, such as base- stations, repeaters, and indoor signal coverage systems.
Owner:DALI SYST LTD
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