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33 results about "Adjacent channel power ratio" patented technology
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Adjacent Channel Power Ratio (ACPR) is ratio between the total power of adjacent channel (intermodulation signal) to the main channel's power (useful signal).
Method and System for Baseband Predistortion Linearization in Multi-Channel Wideband Communication Systems
ActiveUS20080152037A1Reducing computational complexity and numerical instabilityMultiple-port networksElectric signal transmission systemsAdjacent channel power ratioFrequency spectrum
An efficient baseband predistortion linearization method for reducing the spectral regrowth and compensating memory effects in wideband communication systems using effective multiplexing modulation technique such as wideband code division multiple access and orthogonal frequency division multiplexing is disclosed. The present invention is based on the method of piecewise pre-equalized lookup table based predistortion, which is a cascade of a lookup table predistortion and piecewise pre-equalizers, to reduce the computational complexity and numerical instability for desired linearity performance with memory effects compensation for wideband transmitter systems. Therefore, the present invention could reduce the computational load, which saves hardware resources in an implementation and improve performance, in terms of adjacent channel power ratio.
Owner:DALI WIRELESS
Methods, transmitters, and computer program products for transmitting a signal by adjusting a delay between an amplitude component of the signal and a phase component of the signal based on the transmission power
InactiveUS6909757B2Correction can not be performedResonant long antennasCarrier regulationAdjacent channel power ratioError vector magnitude
Embodiments of methods, transmitters, and computer program products are provided for transmitting a signal by adjusting a delay between an amplitude component of the signal and a phase component of the signal based on the transmission power. Error vector magnitude and adjacent channel power ratio are two common criteria used in evaluating transmitter performance. By adjusting the delay between the amplitude component of the transmitted signal and the phase component of the transmitted signal, the error vector magnitude and / or the adjacent channel power ratio may be reduced. The particular delay value that provides the best error vector magnitude performance and / or adjacent channel power ratio performance may differ based on the transmission power level. Therefore, the delay value is adjusted based on the transmission power.
Owner:ERICSSON INC
Design method and design device for cascade filter
ActiveCN102098025ASmall distortionGood band-limiting characteristicsDigital technique networkFinite impulse responseAdjacent channel power ratio
The embodiment of the invention provides a design method for a cascade filter, which comprises the following steps of: determining the interpolation times N of the filter; calculating the filter coefficient of a programmable finite impulse response (PFIR) filter, and obtaining a design scheme of a cascade combined filter of PFIR and cascaded integrator comb (CIC) filters; and when the interpolation times of the cascade combined filter of the PFIR and CIC filters does not reach the predetermined times, designing a half band (HB) filter, so that the filter performance of the cascade combined filter of the PFIR and CIC filters and the HB filter meets the interpolation times requirement of a system, and the design of the PFIR filter is realized by adopting a multistage design scheme. According to the embodiment provided by the invention, by adopting the design device for the multistage filter, the order of the designed filter is in a realizable range of the FPGA, and the indexes such as interpolation times of signals, error vector magnitude (EVM), adjacent channel power ratio (ACPR) and the like can meet the protocol requirement. Moreover, according to the technical scheme provided bythe invention, the resource consumption of the filter is also lower than that of the design method for the traditional filter, and the use of FPGA hardware resources can be effectively reduced.
Owner:DATANG MOBILE COMM EQUIP CO LTD
System and method for station detection and seek in a radio receiver
A system for detecting a broadcast channel in a radio receiver includes a receive signal strength indicator (RSSI) element configured to develop an RSSI signal that is representative of a power in a desired channel, a switchable bandwidth channel select filter having a power detector configured to compare a power output of the desired channel and at least one channel adjacent to the desired channel to develop a signal to adjacent channel power ratio (SACPR) signal that is representative of the noise in the desired channel, and a seek element configured to determine whether the RSSI signal is greater than a predetermined RSSI threshold and configured to determine whether the SACPR signal is greater than a predetermined SACPR threshold.
Owner:SKYWORKS SOLUTIONS INC
Method and system for training digital predistortion coefficient
InactiveCN104869091AAccurately judge the processing effectMeet performance requirementsSynchronous/start-stop systemsAdjacent channel power ratioSimulation
The embodiment of the invention relates to the technical field of communication, specifically to a method and a system for training a digital predistortion coefficient, which are used for training a DPD coefficient meeting performance requirements. In the embodiment of the invention, the adjacent channel power ratio (ACPR) of a feedback signal of a training sequence is judged after each DPD processing, so that the effect of each DPD processing can be accurately judged; and when the ACPR meet the requirements, i.e. the effect of DPD processing meets the requirements, the process is ended, and therefore a DPD coefficient meeting the performance requirements is obtained.
Owner:DATANG MOBILE COMM EQUIP CO LTD
Digital pre-distortion processing method and apparatus
ActiveCN105763503ACounteracts Nonlinear DistortionAvoid signal distortionMultiple carrier systemsPower controllerAdjacent channel power ratio
The invention discloses a digital pre-distortion processing method and apparatus. The method comprises: an input signal and an output signal of a power amplifier at a current time are collected, wherein the input signal is a signal after DPD processing by using a first digital pre-distortion (DPD) technology coefficient; according to the input signal and the output signal, an adjacent channel power ratio (ACPR) corresponding to the first DPD coefficient and a fitting error corresponding to the first DPD coefficient are determined; whether the ACPR corresponding to the first DPD coefficient and the fitting error corresponding to the first DPD coefficient meet a set condition is determined; if none of the ACPR corresponding to the first DPD coefficient and the fitting error corresponding to the first DPD coefficient meets the set condition, a DPD coefficient generated by training is used for replacing the first DPD coefficient, wherein the DPD coefficient generated by training is obtained by training based on a plurality of second DPD coefficients before the current time. Therefore, a problem that signal distortion occurs because DPD processing fails to be done due to abnormal characteristics of the power controller and the high-low-temperature power amplifier can be solved.
Owner:COMBA TELECOM SYST CHINA LTD
Transmitter with a sliding compression point
InactiveUS20020180522A1Amplifier modifications to reduce noise influenceGain controlAdjacent channel power ratioAudio power amplifier
A transmitter has a power amplifier amplifying a radio frequency transmit signal. The radio frequency transmit signal is a non-constant envelope modulated signal. The power amplifier has a first compression point. In a method for sliding a compression point in the transmitter, the power amplifier is operated at a first backoff from the first compression point such that a given adjacent channel power ratio requirement is met for a first peak-to-average ratio of the radio frequency transmit signal. The first compression point is slide to a second compression point for a second peak-to-average ratio of the radio frequency transmit signal, the second compression point being lower than the first compression point. The first and second peak-to-average ratios are dependent on information content of the non-constant envelope modulated signal.
Owner:NXP BV
Remote radio unit and method for regulating drain voltage thereof
ActiveCN102064770AReduce lossLow costHigh frequency amplifiersPower amplifiersAdjacent channel power ratioAudio power amplifier
The invention provides a Remote Radio Unit (RRU) and a method for regulating drain voltage of the RRU, wherein the RRU comprises a feedback path, a calculation judgment unit, a power supply module and a power amplifier, wherein the feedback path is used for acquiring an output signal of the power amplifier and transmitting the output signal to the calculation judgment unit; the calculation judgment unit is used for calculating an Adjacent Channel Power Ratio (ACPR) of the output signal and raising the voltage of the power supply module according to a set stepping configuration if judging thatthe ACPR is larger than a target value and the absolute value of the difference between the ACPR and the target value is larger than a preset value, wherein if judging that the absolute value of the difference between the ACPR and the target value is smaller than or equal to the preset value, the voltage of the power supply module is not regulated; the power supply module is used for supplying power to the power amplifier according to the voltage configured by the calculation judgment unit; and the power amplifier is used for signal amplification and signal output based on the power supply ofthe power supply module. According to the proposal of the invention, energy consumption can be lowered.
Owner:北京万海云科技有限公司
Method and device for obtaining signals with low peak-to-average power ratio based on error vector magnitude
InactiveCN102546498ASatisfy the index requirement of leakage power ratio (ACLR)Achieving rangePower managementMulti-frequency code systemsAdjacent channel power ratioCarrier signal
The invention aims at providing a method and a device for obtaining signals with low peak-to-average power ratio based on error vector magnitude. The radio remote unit receives one channel or multi-channel carrier signals. An adjustment factor of the one-channel or multi-channel carrier signals is obtained according to expected error vector magnitude of the one-channel or multi-channel carrier signals. Peak compensation signals of the channel or multi-channel carrier signals are generated according to the adjustment factor. Peak compensation processing is conducted according to the peak compensation signals so as to obtain the signals with low peak-to-average power ratio. Compared with the prior art, the adjustment factor is adjusted based on the error vector magnitude, the signals with low peak-to-average power ratio are obtained, requirements of expected error vector magnitude (EVM) and peak-to-average power ratio (PAPR) are met, and furthermore, index requirements of adjacent channel leakage power ratio (ACLR) are met.
Owner:ALCATEL LUCENT SHANGHAI BELL CO LTD
Power amplifier and signal processing method
ActiveCN102118132AImprove ACPR and other linear indicatorsImprove linearity indexAmplifier modifications to reduce non-linear distortionAdjacent channel power ratioIntegrator
The embodiment of the invention discloses a power amplifier and a signal processing method, and relates to the field of mobile communication. The power amplifier comprises a pulse modulator, a level adjustor and an amplitude power amplifier. The embodiment of the invention also provides a signal processing method. The method is that: signals processed by at least one integrator and the signals subjected to quantitative processing in the pulse modulator are the signals obtained by respectively subtracting a level adjusting value from preset high and low level values in the pulse modulator; because the level adjusting value is obtained by dividing a saturation level value of the amplitude power amplifier by a level amplification factor, a saturation level generated by the amplitude power amplifier is generated; a carrier leakage phenomenon caused by the saturation level of the amplitude power amplifier in the conventional power amplifier used for transmitting radio-frequency signals is avoided; therefore, linear indexes such as an adjacent channel power ratio (ACPR) of the power amplifier are greatly improved; and the distortion of the signals is reduced.
Owner:HUAWEI TECH CO LTD
Power amplifier pre-distortion method of complex-valued pipeline recurrent neural network model
PendingCN110765720AEffective compensationAccurate modelingAmplifier modifications to reduce non-linear distortionAmplifier modifications to raise efficiencyAdjacent channel power ratioAlgorithm
The invention discloses a power amplifier pre-distortion method for a complex-valued pipeline recurrent neural network model. The power amplifier pre-distortion method comprises the steps: carrying out the modeling of a power amplifier behavior model through the complex-valued pipeline recurrent neural network model, solving a pre-distorter module, and carrying out the pre-distortion operation ofa power amplifier input signal, and specifically includes the steps: firstly, part of input and output signals of a power amplifier are used as test signals, and forward modeling is conducted on the power amplifier, and the model weight is optimized through an enhanced complex value real-time recursive learning algorithm, and the optimal model weight is obtained, and the nonlinear and memory capacity of the power amplifier represented by the model is checked; secondly, inversion is performed on the model so as to perform reverse modeling on the power amplifier to obtain a predistorter structure; and finally, the input signal of the power amplifier obtains a signal subjected to pre-distortion compensation through the predistorter structure, and sends the signal into the power amplifier, sothat the adjacent channel power ratio of the output signal of the power amplifier obtained at the moment can be remarkably improved.
Owner:CHONGQING UNIV
Optical transmission system with gain control for reducing spurious signal components
InactiveCN1701542AWavelength-division multiplex systemsDistortion/dispersion eliminationAdjacent channel power ratioMultiplexing
In a transmitter (11), a peak detection section (104) detects a peak factor of a frequency division multiplexed signal which is output from a frequency division multiplex section (103). A spurious calculation section (105) instructs a gain adjustment section (106) to adjust the signal level of the frequency division multiplexed signal so that the level of spurious components (e.g., adjacent channel leakage power ratio (ACLR)) is equal to or less than a predetermined level, based on the peak factor.
Owner:PANASONIC CORP
Circuit and Method for Reducing Radio-Frequency Power Consumption of Mobile Phone
ActiveUS20120100897A1Reduce power consumptionReduce output powerEnergy efficient ICTPower managementAdjacent channel power ratioAudio power amplifier
The invention discloses a circuit and a method for reducing radio frequency power consumption of mobile phone, wherein a baseband processing chip (21) adjusts a base bias voltage and / or a collector bias voltage of a radio frequency power amplifier (23) according to radio frequency power output of the radio frequency power amplifier (23). Since the invention reduces the radio frequency output power of the radio frequency power amplifier (23) by moderately reducing the base bias voltage and / or the collector bias voltage at the same time when it is ensured that the mobile phone communicates with a base station normally and the linear index and the Adjacent Channel Power Ratio (ACPR) of the radio frequency power amplifier (23) meet the requirements of the specification, thus the efficiency of the radio frequency power amplifier can be improved, the battery energy is saved and the heating problem of the mobile phone is relieved.
Owner:ZTE CORP
10W multicarrier power amplifier applied to 5G system base station
PendingCN109302150ASatisfy Restraint (ACPR) RequirementsWork reliablyAmplifier modifications to reduce non-linear distortionAmplifier modifications to reduce noise influenceAdjacent channel power ratioAudio power amplifier
The invention discloses a 10W multicarrier power amplifier applied to a 5G system base station. The 10W multicarrier power amplifier comprises an input / output circuit, a power amplifier circuit, a lownoise amplifier circuit and a radio frequency switch control circuit. The low noise amplifier circuit and the power amplifier circuit control time division working through utilization of the radio frequency switch control circuit. In order to satisfy a requirement of an adjacent channel power ratio (ACPR) and realize the fact that plenty of margin exist, an existing mature predistortion technology is employed. When an output power of the power amplifier is 10W, + / -1.6MHz out-of-band rejection is smaller than or equal to -46dBc, and + / -3.2MHz out-of-band rejection is smaller than or equal to -51dBc. Through high and low temperature experiments, stability and reliability experiments and an HALT experiment, the power amplifier provided by the invention is low in power consumption, total working efficiency is 11%-12%, the requirement of the adjacent channel power ratio (ACPR) is satisfied, working efficiency is high, and reliable and stable working of the power amplifier circuit and the low noise amplifier circuit is guaranteed.
Owner:华兴通信技术有限公司
Communication device with power amplifier crest factor reduction
InactiveCN105703715AHigh frequency amplifiersPower amplifiersAdjacent channel power ratioAudio power amplifier
The invention provides a communication device with power amplifier crest factor reduction. Various embodiments include a power amplifier with crest factor reduction embodied by first circuitry for producing a correlated out-of-band noise signal for controlling the adjacent channel leakage ratio (ACLR) of a communication device; and second circuitry for providing an output signal for controlling the error vector magnitude (EVM) of a digital radio. The ACLR and the EVM are concurrently individually controllable. Additional apparatus is described.
Owner:INTEL IP CORP
Digital pre-distortion (DPD) parameter monitoring device and method
ActiveCN102572874AImprove stabilityWireless communicationSynchronous/start-stop systemsAdjacent channel power ratioComputer science
The invention discloses a digital pre-distortion (DPD) parameter monitoring device and method. The device is connected with a DPD parameter obtaining module and a PDP processing module respectively, is used for rectifying the correctness and effectiveness of PDP parameters obtained by the DPD parameter obtaining module and outputs the PDP parameters passing the correctness verification and effectiveness verification to the PDP processing module for PDP processing. By adopting the device and method provided by the invention, the PDP parameters obtained by the DPD parameter obtaining module can be monitored, the stability and reliability of the DPD parameters for pre-distortion are ensured, and the stability of adjacent channel power ratio (ACPR) index of a power amplifier output signal can be further ensured.
Owner:ZTE CORP
Transmitter with a sliding compression point
InactiveUS6507244B2Amplifier modifications to reduce noise influenceAmplifier modifications to reduce temperature/voltage variationAdjacent channel power ratioAudio power amplifier
A transmitter has a power amplifier amplifying a radio frequency transmit signal. The radio frequency transmit signal is a non-constant envelope modulated signal. The power amplifier has a first compression point. In a method for sliding a compression point in the transmitter, the power amplifier is operated at a first backoff from the first compression point such that a given adjacent channel power ratio requirement is met for a first peak-to-average ratio of the radio frequency transmit signal. The first compression point is slide to a second compression point for a second peak-to-average ratio of the radio frequency transmit signal, the second compression point being lower than the first compression point. The first and second peak-to-average ratios are dependent on information content of the non-constant envelope modulated signal.
Owner:NXP BV
Digital predistortion algorithm system suitable for hardware realization
InactiveCN102354118ATo achieve the purpose of compensationSatisfy ACPRAdaptive controlAdjacent channel power ratioCommunication quality
The invention belongs to the technical field of simulated and mixed signal integrated circuits, in particular to a digital predistortion algorithm system suitable for hardware realization. The algorithm system consists of a predistortion module, a predistortion lookup table updating module, a loop circuit delay estimation module and a loop circuit phase rough rotation compensation module. The digital predistortion algorithm system mainly corrects a nonlinear component in an emitter so as to suppress the influence of adjacent channel extension on communication quality. The digital predistortion algorithm system can well meet a requirement of the emitter on a protocol adjacent channel power ratio (ACPR) and is suitable for hardware realization; therefore, an effect of improving the nonlinearity of the emitter is achieved at lower cost.
Owner:FUDAN UNIV
Screening method and device of digital pre-distortion sample
InactiveCN106160676AExcellent input sampleHigh DPD performanceAmplifier modifications to reduce non-linear distortionAdjacent channel power ratioData stream
The invention discloses a screening method of a digital pre-distortion sample. The screening method comprises the following steps: receiving a base station system message and acquiring screening parameters corresponding to the base station system message; and screening data streams transmitted by a base station according to the screening parameters to obtain a first digital pre-distortion sample. The invention further discloses a screening device of the digital pre-distortion sample. With the adoption of the screening method and device of the digital pre-distortion sample, the stability of an ACPR (Adjacent Channel Power Ratio) index of an output signal of a power amplifier can be guaranteed.
Owner:ZTE CORP
Feedforward amplifier and control method thereof
InactiveCN101515785AImprove efficiencyNo nonlinear distortionAmplifier modifications to reduce non-linear distortionPower amplifiersAdjacent channel power ratioAudio power amplifier
Owner:NTT DOCOMO INC
Receiver radio frequency link nonlinear effect multi-parameter test platform
ActiveCN113612553AComprehensive test parametersReceivers monitoringAdjacent channel power ratioTest platform
The invention discloses a receiver radio frequency link nonlinear effect multi-parameter test platform which comprises a plurality of test modules such as an intermodulation test subsystem, a power compression test subsystem, an amplitude-phase error test subsystem, a receiver link parameter test subsystem and a theoretical parameter calculation test subsystem. The testing and the displaying of a dual-frequency image, an input and output power response diagram under a fixed frequency point, a 1dB compression point diagram under different frequency points, a power compression three-dimensional diagram, an error vector amplitude, an amplitude-frequency characteristic diagram, a phase-frequency characteristic diagram, a nonlinear effect parameter, a third-order truncation point and an adjacent channel power ratio are realized; The test platform is a universal comprehensive test platform scheme aiming at the nonlinear effect of the radio frequency link of the receiver, and can be suitable for testing the nonlinear effect of various types and frequency bands of receivers between 150MHz and 40GHz.
Owner:SHANDONG UNIV
Circuit and method for reducing radio-frequency power consumption of mobile phone
ActiveUS8548414B2Relieve heating problemReduce frequencyPower managementEnergy efficient ICTAdjacent channel power ratioAudio power amplifier
Owner:ZTE CORP
Method for reducing adjacent channel power ratio based on CIC filter and CIC filter
InactiveCN106849906AReduce distractionsLow costDigital technique networkAdjacent channel power ratioIntegrator
The invention discloses a method for reducing an adjacent channel power ratio based on a CIC filter and the CIC filter. The method comprises the steps of inputting a data signal into the CIC filter, wherein a comb filter of the CIC filter outputs data; generating an integral pulse cic_inter_fs and interpolating the data signal through an interpolation module; controlling the comb filter to output switching of data and ''0'' interpolation by combined logic, if the cic_inter_fs is equal to '0 ', interpolating ''0'' value, and inputting full 0 data by an integrator; if the cic_inter_fs is equal to '1 ', inputting the output data of the comb filter by the integrator; and if the ''0'' value is interpolated, calculating data bit width through a bit width control packet module, and outputting the data by the integrator. According to the method for reducing the adjacent channel power ratio based on the CIC filter and the CIC filter provided by the invention, a CIC algorithm is realized through logic, so the adjacent channel power ratio (ACPR) of a reader reaches a protocol standard, and the reading efficiency of an external filed application of the reader is not reduced.
Owner:ZTE INTELLIGENT IOT TECH
Power amplifier and signal processing method
ActiveCN102118132BImprove ACPR and other linear indicatorsImprove linearity indexAmplifier modifications to reduce non-linear distortionAdjacent channel power ratioIntegrator
The embodiment of the invention discloses a power amplifier and a signal processing method, and relates to the field of mobile communication. The power amplifier comprises a pulse modulator, a level adjustor and an amplitude power amplifier. The embodiment of the invention also provides a signal processing method. The method is that: signals processed by at least one integrator and the signals subjected to quantitative processing in the pulse modulator are the signals obtained by respectively subtracting a level adjusting value from preset high and low level values in the pulse modulator; because the level adjusting value is obtained by dividing a saturation level value of the amplitude power amplifier by a level amplification factor, a saturation level generated by the amplitude power amplifier is generated; a carrier leakage phenomenon caused by the saturation level of the amplitude power amplifier in the conventional power amplifier used for transmitting radio-frequency signals is avoided; therefore, linear indexes such as an adjacent channel power ratio (ACPR) of the power amplifier are greatly improved; and the distortion of the signals is reduced.
Owner:HUAWEI TECH CO LTD
A digital predistortion processing method and device
ActiveCN105763503BCounteracts Nonlinear DistortionAvoid signal distortionMultiple carrier systemsAdjacent channel power ratioPower controller
Owner:COMBA TELECOM SYST CHINA LTD
Remote radio unit and method for regulating drain voltage thereof
ActiveCN102064770BReduce lossLow costHigh frequency amplifiersPower amplifiersAdjacent channel power ratioAudio power amplifier
The invention provides a Remote Radio Unit (RRU) and a method for regulating drain voltage of the RRU, wherein the RRU comprises a feedback path, a calculation judgment unit, a power supply module and a power amplifier, wherein the feedback path is used for acquiring an output signal of the power amplifier and transmitting the output signal to the calculation judgment unit; the calculation judgment unit is used for calculating an Adjacent Channel Power Ratio (ACPR) of the output signal and raising the voltage of the power supply module according to a set stepping configuration if judging thatthe ACPR is larger than a target value and the absolute value of the difference between the ACPR and the target value is larger than a preset value, wherein if judging that the absolute value of the difference between the ACPR and the target value is smaller than or equal to the preset value, the voltage of the power supply module is not regulated; the power supply module is used for supplying power to the power amplifier according to the voltage configured by the calculation judgment unit; and the power amplifier is used for signal amplification and signal output based on the power supply ofthe power supply module. According to the proposal of the invention, energy consumption can be lowered.
Owner:北京万海云科技有限公司
Digital predistortion algorithm system suitable for hardware realization
InactiveCN102354118BTo achieve the purpose of compensationCutting costsSynchronous/start-stop systemsAdjacent channel power ratioCommunication quality
The invention belongs to the technical field of simulated and mixed signal integrated circuits, in particular to a digital predistortion algorithm system suitable for hardware realization. The algorithm system consists of a predistortion module, a predistortion lookup table updating module, a loop circuit delay estimation module and a loop circuit phase rough rotation compensation module. The digital predistortion algorithm system mainly corrects a nonlinear component in an emitter so as to suppress the influence of adjacent channel extension on communication quality. The digital predistortion algorithm system can well meet a requirement of the emitter on a protocol adjacent channel power ratio (ACPR) and is suitable for hardware realization; therefore, an effect of improving the nonlinearity of the emitter is achieved at lower cost.
Owner:FUDAN UNIV
Crest reduction method and device of broadband signal
ActiveCN102299883BEffective peak clippingHigh utility valueMulti-frequency code systemsAdjacent channel power ratioMulti band
The embodiment of the invention provides a crest reduction method of a broadband signal. The method comprises the following steps: multi-carrier signals in first and second frequency bands are subjected to digital intermediate-frequency filter after completing physical layer phase rotation at each frequency bands in a physical layer, and spectrums are moved to the first and second frequency bands respectively after the spectrums of the signals in the first and second frequency bands are molded respectively; after the moved multi-carrier signals are superposed, the multi-carrier signal superposition is completed in digital intermediate-frequency; and the superposed signals are subjected to multi-band, multi-carrier and multi-mode crest reduction processing crest factor reduction (CFR) operation, and the multi-carrier signals, subjected to crest reduction, are output. The embodiment of the invention also provides a crest reduction device of the broadband signal, which comprises a spectrum moving module, a superposition module and a crest reduction module. According to the method and the device, a multi-carrier multi-band algorithm is acquired, which can adapt to the TD (time division) multi-band crest reduction and be applied to a TD and LTE (long term evolution) mixed platform with effective crest reduction effect without exacerbated ACPR (adjacent channel power ratio), thus having the higher practical value.
Owner:DATANG MOBILE COMM EQUIP CO LTD
Design method and design device for cascade filter
ActiveCN102098025BSmall distortionGood band-limiting characteristicsDigital technique networkFinite impulse responseAdjacent channel power ratio
The embodiment of the invention provides a design method for a cascade filter, which comprises the following steps of: determining the interpolation times N of the filter; calculating the filter coefficient of a programmable finite impulse response (PFIR) filter, and obtaining a design scheme of a cascade combined filter of PFIR and cascaded integrator comb (CIC) filters; and when the interpolation times of the cascade combined filter of the PFIR and CIC filters does not reach the predetermined times, designing a half band (HB) filter, so that the filter performance of the cascade combined filter of the PFIR and CIC filters and the HB filter meets the interpolation times requirement of a system, and the design of the PFIR filter is realized by adopting a multistage design scheme. According to the embodiment provided by the invention, by adopting the design device for the multistage filter, the order of the designed filter is in a realizable range of the FPGA, and the indexes such as interpolation times of signals, error vector magnitude (EVM), adjacent channel power ratio (ACPR) and the like can meet the protocol requirement. Moreover, according to the technical scheme provided by the invention, the resource consumption of the filter is also lower than that of the design method for the traditional filter, and the use of FPGA hardware resources can be effectively reduced.
Owner:DATANG MOBILE COMM EQUIP CO LTD
A multi-parameter test platform for nonlinear effect of receiver radio frequency link
ActiveCN113612553BComprehensive test parametersReceivers monitoringAdjacent channel power ratioTest platform
The invention discloses a receiver radio frequency link nonlinear effect multi-parameter test platform, including: intermodulation test subsystem, power compression test subsystem, amplitude and phase error test subsystem, receiver link parameter test subsystem, theoretical parameters Multiple test modules such as calculation and test subsystems, realize dual-frequency images, input and output power response graphs at fixed frequency points, 1dB compression point graphs at different frequency points, power compression three-dimensional graphs, error vector magnitudes, amplitude-frequency characteristic graphs, phase Frequency characteristic graph, nonlinear effect parameters, third-order interception point and adjacent channel power ratio test and display. It is a universal comprehensive test platform solution for nonlinear effects of receiver radio frequency links. Test the non-linear effects of receivers of various types and frequency bands between 40GHz.
Owner:SHANDONG UNIV
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