147results about How to "Improve power amplifier efficiency" patented technology

Power amplifier arrangements, methods, and software arranged to receive a power input which is voltage-modulated responsive to at least one control signal representative of the data signal. The data input to the power amplifier is pre-distorted and the resulting power amplification is substantially linear. The arrangement may be used in wireless base station transmitters, but is not limited to such applications. Improved data transmission services are also provided which make use of such power amplifiers.

There is disclosed a method of controlling an input to an envelope modulated power supply of an envelope tracking amplification stage, comprising: generating an envelope signal representing the envelope of a signal to be amplified; applying a shaping function to the envelope signal to generate a shaped envelope signal, including: clipping the shaped envelope signal at high input envelope values; and providing the shaped envelope signal as an input signal to the envelope modulated power supply.

The present invention discloses a method for increasing the power amplifying efficiency and the digital predistortion broadband communicator thereof. The digital predistortion broadband communicator comprises a digital signal processing module, an envelope signal channel, a forward signal channel, a feedback signal channel and a radio frequency power amplifier. The digital signal processing module is used for receiving the base band IQ complex signal and generating envelope signal, forward signal and feedback signal with carrier frequency after deplexing. The envelope signal channel executes A / D converting and filtering to the envelope signal and comprises a broadband envelop electric power modulator which is used for generating the voltage varying real-time according to the real-time variation of the envelope signal and supplying the voltage to the radio frequency power amplifier as the drain electric voltage offset. As the method of the invention and the digital predistortion broadband communicator adopt a base band crest factor reducing technique, a digital predistortion technique, an envelop tracing technique, a broadband envelop electric power modulating technique and the like, the power amplifying efficiency is greatly increased and the application of the envelop tracing technique in the wideband signal system field is promoted.

A two stage power amplifier circuit that employs both a DC to DC converter and sliding bias controller to improve power amplifier efficiency. The control signal that is generated by the power detector circuit to control the input voltage to the DC to DC converter is also used to provide the reference voltage that controls the sliding bias controller. The sliding bias controller reduces the quiescent current of the power amplifiers by reducing the bias currents, and thus the DC voltage at lower power output levels driving the power amplifiers. This causes the power amplifiers to operate at or near higher efficiency Class B operation at lower power output levels. As the power level increases, the sliding bias controller reduces its control on the bias currents so that the power amplifier can be driven at necessary higher power output levels.

The invention discloses a broadband power line carrier communication physical layer emission signal processing method based on OFDM. The method includes: receiving data from a link layer, and dividing the data into frame control data and load data; performing channel coding on the frame control data and the load data, and modulating the frame control data and the load data after channel coding to subcarriers; performing inverse Fourier transform on the modulated frame control data and the load data, performing power control, and generating a time domain frame control symbol and a time domain load symbol; and adding a cyclic prefix to the time domain frame control symbol and the time domain load symbol, adding a time domain leading symbol, performing windowing processing, and generating physical layer emission signals. According to the method, the utilization rate of the frequency band is high, the transmission rate is high, and the intersymbol interference resistance and the channel fading resistance are excellent.

The embodiment of the invention discloses a Doherty power amplifier and a method and equipment for improving the power amplification efficiency of the Doherty power amplifier. On one hand, the invention provides the method for improving the power amplification efficiency of the Doherty power amplifier. The method is applied to the Doherty power amplifier with two parallel Doherty circuit units. Each Doherty circuit unit comprises a main power amplifier and a peak power amplifier, wherein the main power amplifier and the peak power amplifier are connected by adopting a parallel connection method. The method comprises the steps that when the output power of the Doherty power amplifier is in a low-power output interval, and the grid voltage of the main power amplifiers and the peak power amplifiers in the two parallel Doherty circuit units are regulated through a biasing circuit to enable the peak power amplifiers to be in a closed state and to enable the main power amplifiers in the two parallel Doherty circuit units to be respectively in a main power amplification state and a peak power amplification state. On the other hand, the invention additionally provides the equipment related to the method. The goals of energy saving and consumption reduction are effectively achieved.

The embodiment of the invention discloses a Doherty power amplifier which comprises a power divider, a multi-frequency band carrier power amplifier, a multi-frequency band peak power amplifier, a first Lambda / 4 impedance transformer and a second Lambda / 4 impedance transformer, wherein the power divider is used for dividing the received signals into a first path of signals and a second path of signals; the multi-frequency band carrier power amplifier is used for amplifying the signals output by the power divider and then transmitting the signals the input end of the first Lambda / 4 impedance transformer; the multi-frequency band peak power amplifier is used for amplifying the second path of signals output by the power divider and then outputting the signals; the first Lambda / 4 impedance transformer supports multiple frequency band ranges, and is used for impedance matching between the load impedance of the first Lambda / 4 impedance transformer and the output impedance of the multi-frequency band carrier power amplifier through impedance conversion; and the second Lambda / 4 impedance transformer is used for impedance matching between the input impedance of the second Lambda / 4 impedancetransformer and the load impedance of the Doherty power amplifier through the impedance conversion. The Doherty power amplifier of the invention supports multi-frequency band operation, has high efficiency, and can lower the power consumption of the system.

The invention discloses a digital predistortion power amplifier and signal processing method thereof. The digital predistortion power amplifier comprises a digital predistortion unit, a digital predistortion adaptive controller, a first digital-to-analogue conversion unit, an up-conversion unit, a power divider, a first wavelength delay unit, a peak value amplifier, a second wavelength delay unit,a coupler, a carrier amplifier, a first down-conversion unit, a first analogue-to-digital conversion unit, an envelope extracting unit and a first signal processing unit; wherein one end of the envelope extracting unit is connected with the base band signal receiving terminal, and the other end is connected with the grid terminal of the peak value amplifier by the first signal processing unit. The invention extracts the envelope signal of the input base band signal by the envelope extracting unit, the first signal processing unit processes the envelope signal to be operational grid voltage value of the peak value amplifier, further the grid voltage value of the peak value amplifier can be set according to the variation of the envelope signal, so as to cause the peak value amplifier to beoperate in high-efficiency state.

A filtering method, a transceiver and a transmitter are provided. The transmitter comprises a power amplifier amplifying an RF signal and having multiple stages, and a local oscillator, the power amplifier comprising between at least two stages of the power amplifier an impedance circuitry for forming an impedance at a frequency related to the frequency of the local oscillator, and a switch for switching the impedance of the impedance circuitry means to RF frequency.

Crest factor reduction algorithms described herein may be used to improve power amplifier efficiency during low signal power conditions compared to traditional static threshold techniques. Techniques described herein insure that the signal power level at the output of the crest fact reduction block is held constant relative to the input power level under all signal power level conditions. Two different solutions may be implemented together or separately to achieve the desired conditions. The first technique provides constant ratio between input power and output power. Constant ratio of peak and average output levels keeps the amount of crest factor reduction applied to the signal constant, irrespective of the signal power level. A second technique is to hold signal power level constant in respect to the amount of crest factor reduction applied.

The invention provides a signal processing method and device. The method comprises the following steps: selecting a specified constellation diagram version according to parameter information of a transmission signal, obtaining a first phase rotation angle corresponding to the specified constellation diagram version, selecting a second phase rotation angle according to preset information, and performing phase rotation for time domain symbols or frequency domain symbols of the transmission signal based on the first phase rotation angle and / or the second phase rotation angle, wherein the parameter information includes one or more of the following parameters: data types, modulation modes, time domain granularity of data duplication, constellation diagram versions of signaling configuration, and predefined constellation diagram versions. According to the signal processing method and device provided by the invention, the peak to average power ratio (PAPR) of the transmission signal can be effectively reduced, the problem of too high PAPR during signal transmission in related technologies can be solved, and thus the power amplifier efficiency of a transmitting terminal can be increased, the power consumption of the terminal can be saved, and the effects of reducing the terminal cost and ensuring the signal coverage of the system can be achieved.

The invention is suitably applied to the field of communication, and provides a feed-forward power amplification circuit and a method for realizing power amplification by using same. The feed-forwardpower amplification circuit comprises a 3dB electric bridge, a first vector modulator, a second delay line, a second coupler, a second vector modulator and an error power amplifier, wherein the firstvector modulator is connected with the 3dB electric bridge; and the second delay line, the second coupler, the second vector modulator and the error power amplifier are sequentially connected with the3dB electric bridge. The feed-forward power amplification circuit further comprises a Doherty power amplifier, a first coupler, a first delay line and a third coupler, wherein the Doherty power amplifier is connected with the first vector modulator and used for carrying amplifying power on radio frequency signals; and the first coupler, the first delay line and the third coupler are sequentiallyconnected with the Doherty power amplifier. The error power amplifier is connected with the input end of the third coupler, and the output end of the first coupler is connected with the input end of the second coupler. The feed-forward power amplification circuit can keep higher power amplification efficiency and linearity, and improve the efficiency of the feed-forward power amplification by over20%.

Disclosed is a resource scheduling method, comprising: according to the number of historically scheduled resources, a base station predicting the maximum upper limit of resources which can be used for the next scheduling, and during the next scheduling, according to the current service condition and the maximum upper limit of resources, the base station conducting resource allocation. Also disclosed at the same time are a resource scheduling device and a computer storage medium. The device comprises a prediction module and a resource allocation module.

The present invention discloses a system which is realized with crest factor reduction and digital predistortion mutual compensation. The system comprises a crest factor reducing (CFR) equipment and a digital predistortion (DPD) equipment, and the system also comprises a CFR and DPD comprehensive processing equipment which is used for controlling and optimization-processing the signal processed by the CFR equipment and the DPD equipment and realizing the mutual compensation between the signals processed by the CFR equipment and the DPD equipment. The invention also discloses a method for realizing the crest factor reduction and digital predistortion mutual compensation. The principle that a converse relationship exists between the processions of CFR equipment and the DPD equipment is used for reducing the non-recoverable damage of the signal by the CFR equipment. Thereby the reducing of the signal peak-to-average ratio is effectively realized. The linearity of the power amplifying is increased while the power amplifying efficiency is increased.

The invention relates to a short-wave communication system based on fountain codes and single carrier frequency domain equalization and a transmission method thereof, and belongs to the technical field related to wireless communication systems, communication signal processing and channel encoding and decoding. Fountain codes are employed in the short-wave data transmission system, and source encoding-channel encoding-modulation combined optimized technology is used, thereby effectively shortening the file transmission time delay in short-wave unidirectional non-feedback channels, enhancing the reliability of a communication system under severe channel environment, improving file transmission efficiency, and effectively ensuring data reliability. Single carrier frequency domain equalization technology based on time-frequency mixed channel estimation is employed to greatly reduce the complexity of a receiver of a single carrier system, and greatly increase the capability of the system to resist frequency domain selectivity fading due caused by multipath transmission of short-wave channels.

An RF transmitter having an RF power amplifier comprising: 1) a drive transistor that receives an input RF signal and generates an output RF signal; and 2) a drain bias adaptation circuit for supplying drain current to the drive transistor. The drain bias adaptation circuit comprises: i) a first switch for coupling the drive transistor drain to a system supply voltage; ii) a second switch for coupling the drive transistor drain to a high supply voltage that is greater than the system supply voltage; iii) a first bypass capacitor coupled to the first switch for reducing noise in the drain current when the first switch is closed and the second switch is open; and iv) a second bypass capacitor coupled to the second switch for reducing noise in the drain current when the second switch is closed and the first switch is open.

A method for designing a constant envelope PSK modulator-demodulator comprises the steps of S1 signal processing of a constant envelope PSK modulator and S2 signal processing of a constant envelope PSK demodulator. According to the step S1, at a transmitting terminal, binary bit streams output by a channel encoder are grouped according to a modulation parameter M; a differential phase sequence is obtained; a minimum additive group is generated by the differential phase; digital signals are subjected to digital-to-analogue conversion, and the modulation process is completed. According to the step S2, at a receiving terminal, first, received FSK signals are sampled, frequency modulation signals are subjected to phase integration; correlation operation is conducted on the signals of a synchronization sequence and all sampling points to obtain the best sampling point; the phase of the PSK signal at the best sampling point is used for extracting soft information, making hard decisions and achieving digital demodulation. According to the method, the NPSK modulation signals are subjected to constant envelope conversion to be used as modulation output, so that the power efficiency of power amplification of the transmitting terminal of a communication system is improved; the receiving terminal enables the signals to be sampled, and the PSK modulation signals can be restored and acquired through a phase integrator and a matched filter.

The invention relates to an improved binary-coded character modulation method of satellite navigation system signals, belonging to the technical field of satellite navigation. On the basis of binary-coded characters, the traditional spread spectrum character is split into K units; each unit uses the character pulse waveform based on MSK (minimum shift keying) instead of the binary value waveform; and proper parameters are selected, thereby having the advantages of interference rejection, multipath resistance and compatibility of the binary-coded character, realizing the constant enveloping of MSK modulation, enhancing the efficiency of the power amplifier, realizing large side lobe attenuation and the like. The invention uses the improved binary-coded character modulation to enhance the code tracking performance, multipath resistance, interference rejection and compatibility with other navigation signals, thereby realizing constant enveloping of signals and avoiding the occurrence of large-amplitude side lobes.

The invention provides a nonlinear detecting method of a repeater power amplifier. The method can monitor a nonlinearity and digital pre-distortion rectifying result of the power amplifier and judge whether the result is reasonable or not by virtue of a three-order intermodulation valve of a double-tone signal, and the method comprises the following steps: signal preprocessing, FFT simplifying after determination of resolution ratio and intermodulation calculation. Besides a repeater, the nonlinear detecting method is also applicable to a plurality of wireless communication systems comprising a large-power power amplifier. The nonlinear detecting method has the beneficial effects that the intermodulation simplifying detecting algorithm complexity in the numeric field is low, the operating rate is quick, the implementability is achieved, an instrument is not required by the algorithm, nonlinearity degree of the power amplifier can be monitored visually by a repeater system, and the linearity rectifying degree of the power amplifier can be monitored by a digital pre-distortion algorithm simultaneously. By utilizing the nonlinear detecting method, the intermodulation magnitude can be calculated conveniently, the algorithm complexity is low, the source consumption is less, the method is easy to realize, and the stability of the repeater system and the digital pre-distortion algorithm is improved simultaneously.

The invention discloses generalized multiple carrier frequency division multiple access transmission equipment based on orthogonal transformation processing. Compared with the current DFT spread spectrum orthogonal frequency division multiple access and N* single carrier frequency division multiple access transformation scheme based on a cluster, the transformation scheme of the invention not only can satisfy system coverage and cell-edge user performance, but also can improve user frequency spectrum efficiency in cells by changing the orthogonal transformation mode of a receiving terminal and a transmitting terminal. When the orthogonal transformation adopts discrete Fourier transform, the transmitting terminal can effectively lower signal transmitting peak-to-mean ratio, which is favorable for improving the power amplifier efficiency of the transmitting terminal so as to improve the system coverage and cell-edge user performance; when orthogonal transformation adopts identical transformation, the frequency spectrum efficiency in cells is improved respectively by independent link self-adaption, hybrid retransmission mechanism and multiple antenna enhancement technology via the system for multiple subbands occupied by single user.

The invention relates to a peak-to-average ratio suppression method based on the optimal amplitude distribution of an OFDM signal, which solves the problems of low power amplifier efficiency and signal distortion of a transmitter in the prior art. The purpose of peak-to-average ratio suppression proposed by the peak-to-average ratio suppression method disclosed by the present invention is not to reduce the highest peak value, but rather improves the efficiency of amplifying the OFDM signal, as well as consider the maximum peak signal during implementation, also consider the probability of occurrence but not the largest amplitude of the sub-peak signal, the constraint of Euclidean distance of constellation point vector in frequency domain on the amplitude distribution curve of OFDM signal is explored, and the optimal amplitude distribution probability curve of OFDM signal satisfying the highest efficiency of power amplifier is obtained. Based on this criterion, the limiting function andACE algorithm of M iterations are trained. The test results show that, in QPSK modulation, 3.15 dB of IBO performance improvement is obtained compared with the original OFDM system after the final time domain transmission signal is optimized by the invention, and the IBO of the single carrier system is only 0.05 dB less than the original OFDM system under the same conditions.

The invention discloses an OFDM-based high-speed wireless communication physical layer transmission signal generation method and system. The method comprises the steps of determining physical frame header control word SIG data, physical frame header PHR data and physical layer service data unit PSDU data according to output data of a media access control layer MAC; respectively processing the SIGdata, the PHR data and the PSDU data according to a preset processing mode; constellation point mapping is carried out respectively, pilot frequency data after power control is inserted, and inverse Fourier transform is carried out on SIG data, PHR data and PSDU data after the pilot frequency data is inserted so as to convert the SIG data, the PHR data and the PSDU data to a time domain; respectively adding cyclic prefixes to the SIG data, the PHR data and the PSDU data which are converted into the time domain so as to respectively generate orthogonal frequency division multiplexing OFDM symbols corresponding to the SIG data, the PHR data and the PSDU data; acquiring time domain preamble signal data; and performing windowing processing on the time domain preamble signal data and OFDM symbols corresponding to the SIG data, the PHR data and the PSDU data to generate an OFDM-based frame signal, and enabling the OFDM-based frame signal to enter an analog front end.

The invention relates to a feed-forward power amplifier on the basis of pre-distortion and a Doherty, which is provided with a first coupler, a pre-distortion module, a main amplifier, a second coupler, a first time delayer, a third coupler, a second time delayer, a combiner and an error amplifier. The main amplifier comprises three or more stages of power amplification tubes; the final stage of power amplification tube at least comprises a double-path or multipath Doherty; an input signal enters the first coupler and is divided into two paths, a through signal fo the input signal is input into the pre-distortion module, an output of the pre-distortion module is connected with an input of the main amplifier, an amplified radio frequency signal output by the main amplifier is connected into the second coupler, a through signal of the amplified radio frequency signal is input into the first time delayer, a coupling signal of the amplified radio frequency signal is input into the combiner, a coupling signal of an input signal is input into the second time delayer and an output of the second time delayer is connected into the combiner; and an output of the combiner is connected into the error amplifier, an output of the error amplifier and an output of the first time delayer are respectively connected into the third coupler and a signal is output by the third coupler.

The invention discloses a PWM (pulse width modulation) audio power amplifier comprising a linear isolating module, a PWM amplifying modulating thick-film, a suspending drive module, a high-tension power bridge and a Butterworth filter. The audio signal input end is connected with the input end of the linear isolating module. The output end of the Butterworth filter is connected with a load of the amplifier. supplied power of the amplifier passes a bridge rectifier circuit, an LPF (low pass filter) and a dual-closed ring APFC (active power factor correction) circuit and is then transmitted to the PWM amplifying modulating thick-film, the suspending drive module, the high-tension power bridge and the Butterworth filter; the PWM amplifying modulating thick-film, the suspending drive module, the high-tension power bridge and the Butterworth filter form a class-D bridge power amplifier topological structure. The amplifier integrating signal amplifying, driving, amplified power output and power supply has the advantages that efficiency of the amplifier is greatly improved, service efficiency of the power supply is greatly improved, and electromagnetic interference of equipment is greatly improved.

The invention discloses a method and a device for adjusting power amplifier voltage of a wireless communication system, belonging to the wireless communication technology. The method comprises the following steps: obtaining the power control level of a current power control period, determining the voltage value of a power amplifier in the current power control period according to the corresponding relationship table of the power control level and the voltage value of the power amplifier, and regulating according to the determined voltage value. Since the corresponding relational table of the power control level and the voltage value of the power amplifier is set according to the empiric value with higher power amplifier efficiency, the power amplifier can operate with higher efficiency when the voltage value of the power amplifier is adjusted to a voltage value corresponding to the current power control level.

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.

The invention relates to a method and a system for reducing a multi-carrier peak average ratio. The system comprises a digital up-conversion (DUC) module and a crest factor reduction (CFR) module. The method comprises the following steps of: before signals are inputted to a power amplifier, performing DUC processing on the signals, and performing intermediate-frequency time delay in the processing process; and after the processing is finished, performing peak clipping on signals of which the amplitude exceeds a threshold value of a preset peak value, and adjusting the delay of each path of signal in the digital up-conversion process according to the occurrence times of the signals of which the amplitude exceeds the threshold value of the peak value within a preset time interval. Due to the adoption of the method and the system, PAR (peak to average power ratio) output by DUC can be reduced effectively, the difficulty of subsequent peak clipping is lowered, the input signals with smalldynamic range are provided for the power amplifier, and the efficiency of the power amplifier is improved.

The invention provides a class F power amplifier based on a coupling loop resonant network. The circuit comprises an input matching network, a gate, a drain bias circuit, a drain fundamental wave matching circuit network and a novel harmonic control network, wherein the bias circuit provides a stable working voltage for a transistor, the matching circuit network matches the source impedance and the load impedance of the transistor to 50 ohm respectively, and meanwhile performs waveform moulding on the voltage and current waveforms, so that the drain voltage of the transistor is a square wave,and the current is a half-sine wave, and then relatively high power and efficiency are obtained. Compared with the prior art, the class F power amplifier provided by the invention improves the harmonic control network of the class F power amplifier, is not limited to only control the second and third harmonics of the class F power amplifier, but increases the control order of the harmonics of theclass F power amplifier, thereby improving the working efficiency while further broadening the bandwidth of the amplifier.

The invention discloses an adjustable bandwidth offset modulation multi-carrier frequency division multiple access transmission method which comprises the steps of generating a sending signal on a sending end and a processing a receiving signal on a receiving end, wherein the whole frequency band is divided into a plurality of sub bands to be allocated to different uses for realizing frequency division multiple access, each sub band (user) adopts offset modulation, bandwidth of each sub band (user) can be independently determined, frequency spectrum overlapping is allowed among the sub bands (users), the receiving end adopts a low-complexity frequency domain balance-based iteration decoding receiver, and can realize sending diversity under the condition of dual sending antennae. According to the method provided by the invention, the peak-to-average ratio of the sending signal is greatly lowered under the condition of keeping the frequency spectrum efficiency, the dynamic and flexible frequency spectrum resource allocation is realized; and meanwhile, by adopting a multi-user united frequency domain balance-based iteration receiving signal processing method, the transmission reliability is ensured at lower complexity.