CN108900207B - Power amplifier device, radio frequency signal processing system and base station - Google Patents
Power amplifier device, radio frequency signal processing system and base station Download PDFInfo
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- H—ELECTRICITY
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- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/02—Transmitters
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- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
- H03F1/32—Modifications of amplifiers to reduce non-linear distortion
- H03F1/3241—Modifications of amplifiers to reduce non-linear distortion using predistortion circuits
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/189—High-frequency amplifiers, e.g. radio frequency amplifiers
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/20—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers
- H03F3/21—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers with semiconductor devices only
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/20—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers
- H03F3/24—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers of transmitter output stages
- H03F3/245—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers of transmitter output stages with semiconductor devices only
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- H03F2200/451—Indexing scheme relating to amplifiers the amplifier being a radio frequency amplifier
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- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
- H04W88/08—Access point devices
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Abstract
The application relates to a power amplifier device, which comprises a predistortion module, a power amplifier module, a shunt processing module and a power coupling module which are connected in sequence, and a pilot frequency combining module and a regulation and control module. And the feedback output end of the power coupling module is connected with the feedback input end of the predistortion module. The signal output end of the power coupling module is connected with the input end of the pilot frequency combining module, and the output end of the pilot frequency combining module is used for being connected with the signal transmitting module. And the detection input end of the regulation and control module is connected with the feedback output end of the power coupling module. The signal correction control end of the regulation and control module is connected with the control end of the predistortion module, and the power amplification control end of the regulation and control module is connected with the control end of the power amplification module. The predistortion module is used for connecting a signal source. The regulation and control module is used for controlling the working state of the power amplification module and regulating the amplitude and the phase of an output signal of the predistortion module according to the power of a feedback signal output by the power coupling module and a correction error parameter of the predistortion module. Can effectively reduce the manufacturing and operation cost.
Description
Technical Field
The present application relates to the field of communications technologies, and in particular, to a power amplifier, a radio frequency signal processing system, and a base station.
Background
With the development of modern communication technology, a base station or a repeater often adopts a multi-frequency device with a single frequency or a combination of single frequencies. The technologies related to power amplification mainly include single-frequency DPD technology, feedforward technology, APD technology and the like. When the power amplifier is applied to modulation signals, the linearity of the power amplifier is difficult to meet the requirement, so that the linearization technology is required to meet the requirement of a system. The linearization technology mainly comprises digital predistortion, feedforward, RFPAL technology and other technologies, the linear correction capability of the technologies is strong, but the technologies are all narrow-band applications, and an effective means is not available in the scene of processing multi-band concurrent signal predistortion. In the process of implementing the invention, the inventor finds that the traditional multiband power amplifier equipment is fewer, and at least the following problem of high operation and maintenance cost exists.
Disclosure of Invention
Therefore, it is necessary to provide a power amplifier device, a radio frequency signal processing system and a base station capable of greatly reducing the operation and maintenance cost of the power amplifier device in order to solve the above technical problems.
In order to achieve the purpose, the embodiment of the invention adopts the following technical scheme:
on one hand, the embodiment of the invention provides a power amplifier device, which comprises a predistortion module, a power amplifier module, a shunt processing module, a power coupling module, a regulation and control module and a pilot frequency combining module;
the predistortion module, the power amplifier module, the shunt processing module and the power coupling module are sequentially connected, a feedback output end of the power coupling module is connected to a feedback input end of the predistortion module, a signal output end of the power coupling module is connected to an input end of the pilot frequency combining module, and an output end of the pilot frequency combining module is used for being connected with a signal transmitting module;
the detection input end of the regulation and control module is connected with the feedback output end of the power coupling module, the signal correction control end of the regulation and control module is connected with the control end of the predistortion module, and the power amplification control end of the regulation and control module is connected with the control end of the power amplification module;
the predistortion module is used for connecting a signal source, and the regulation and control module is used for controlling the working state of the power amplification module and regulating the amplitude and the phase of an output signal of the predistortion module according to the power of a feedback signal output by the power coupling module and a correction error parameter of the predistortion module.
In one embodiment, the regulation module comprises a control circuit and a detection circuit;
the power detection end of the control circuit is connected with the detection output end of the detection circuit, the signal correction control end of the control circuit is connected with the control end of the predistortion module, the power amplifier control end of the control circuit is connected with the control end of the power amplifier module, and the detection input end of the detection circuit is connected with the feedback output end of the power coupling module.
In one embodiment, the control circuit comprises a microprocessor.
In one embodiment, the detector circuit comprises a multifrequency detector circuit.
In one embodiment, the predistortion module includes a multi-frequency predistortion circuit, the power amplifier module is a broadband power amplifier circuit, the shunt processing module includes a multi-frequency shunt processing circuit, the power coupling module includes a multi-path power coupling circuit, and the feedback filter module includes a multi-path feedback filter circuit.
In one embodiment, the shunting processing module includes a different-frequency shunting circuit and a multi-frequency filter circuit, which are cascaded, an input end of the different-frequency shunting circuit is connected to an output end of the power amplifier module, and an output end of the multi-frequency filter circuit is connected to an input end of the power coupling module.
In one embodiment, the power coupling module further comprises a feedback filtering module, an input end of the feedback filtering module is connected to a feedback output end of the power coupling module, and an output end of the feedback filtering module is respectively connected to a feedback input end of the predistortion module and a detection input end of the regulation and control module.
On the other hand, the radio frequency signal processing system comprises a signal source, a signal transmitting module and the power amplifier device, wherein the signal output end of the signal source is connected with the signal input end of the power amplifier device, and the signal output end of the power amplifier device is connected with the signal input end of the signal transmitting module.
In one embodiment, the signal source comprises a digital radio frequency integrated board, and the signal transmitting module comprises a multi-frequency antenna.
In another aspect, a base station is also provided, which includes the above radio frequency signal processing system.
One of the above technical solutions has the following advantages and beneficial effects:
according to the power amplifier device, the radio frequency signal processing system and the base station, signal amplification processing is carried out through each signal processing module and each regulation and control module which are mature in application technology, signal predistortion and amplification are effectively achieved, the structural size of the device is greatly reduced, and manufacturing, operation and maintenance costs are effectively reduced.
Drawings
Fig. 1 is a schematic diagram of a first structure of a power amplifier device according to an embodiment;
fig. 2 is a schematic diagram of a second structure of the power amplifier device in an embodiment;
fig. 3 is a schematic diagram of a third structure of the power amplifier device in an embodiment;
fig. 4 is a schematic diagram of a fourth structure of the power amplifier device in an embodiment;
FIG. 5 is a diagram illustrating an exemplary RF signal processing system.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
Referring to fig. 1, in an embodiment, a power amplifier apparatus 100 is provided, which includes a predistortion module 12, a power amplifier module 14, a shunt processing module 16, a power coupling module 18, a pilot frequency combining module 20, and a regulation and control module 22. The predistortion module 12, the power amplifier module 14, the shunt processing module 16 and the power coupling module 18 are connected in sequence. A feedback output of the power coupling module 18 is connected to a feedback input of the predistortion module 12. The signal output end of the power coupling module 18 is connected to the input end of the pilot frequency combining module 20, and the output end of the pilot frequency combining module 20 is used for connecting to the signal transmitting module. The detection input terminal of the regulation module 22 is connected to the feedback output terminal of the power coupling module 18. The signal correction control end of the regulation module 22 is connected to the control end of the predistortion module 12, and the power amplifier control end of the regulation module 22 is connected to the control end of the power amplifier module 14. The predistortion module 12 is used for connecting a signal source. The regulation and control module 22 is configured to control an operating state of the power amplifier module 14, and adjust an amplitude and a phase of an output signal of the predistortion module 12 according to the power of the feedback signal output by the power coupling module 18 and the correction error parameter of the predistortion module 12.
The signal source is a source side device or apparatus of the radio frequency signal, and is configured to input the radio frequency signal, which needs to be subjected to power amplification and the like and then propagates to the outside, into the predistortion module 12, where the signal source may output a single frequency signal or a multi-frequency signal. The signal transmitting module is a radio frequency signal transmitting side device or a processing system, and is configured to transmit a signal of the radio frequency signal output after being processed by the power amplifier device 100. The corrected error parameter is an error value generated by comparing a single-frequency signal amplified by predistortion and power amplification with a linear signal output by a signal source, and the error value is obtained by performing comparison calculation inside the predistortion module 12 (if the peak-to-average ratio of the signal output by the signal source is a, and the peak-to-average ratio of the signal amplified by predistortion correction is B, the error value Δ is a-B, and the smaller Δ represents the better effect after correction).
It is understood that the predistortion module 12 may be a dual-band predistortion circuit module, such as a dual-channel predistorter, which is conventional in the art, or may be a multi-band predistortion circuit module, such as a predistorter with more than two channels, which is used for being cascaded with the power amplifier module 14 to perform linear processing on the input signal. The power coupling module 18 may be a single-frequency or dual-frequency signal coupling circuit module, or a multi-band signal coupling circuit module, which is conventional in the art, and is used for performing signal forward output on a passing input signal and coupling to obtain a feedback signal output. The shunt processing module 16 may be a pilot frequency signal shunt processing circuit conventional in the art, and is configured to correspondingly shunt the input signal into a plurality of single-frequency signals according to different frequencies, and output the signals to the power coupling module 18. The pilot frequency combining module 20 may be a signal combiner widely applied in the field, and is configured to combine one or more input signals into one signal and output the signal.
Specifically, after receiving an input signal input by the signal source, the predistortion module 12 performs predistortion processing on the input signal and outputs the input signal to the power amplifier module 14. The power amplifier module 14 amplifies the pre-distorted input signal and outputs the amplified signal to the shunt processing module 16. If the amplified input signal contains one frequency component, the splitting processing module 16 directly outputs the input signal to the power coupling module 18. If the amplified input signal contains two or more frequency components, the splitting processing module 16 splits the input signal to obtain different single-frequency input signals, for example, each frequency component corresponds to a single-frequency input signal, and outputs the single-frequency input signal to the power coupling module 18. The power coupling module 18 outputs the input signal processed by the shunt processing module 16 to the signal transmitting module, and performs signal coupling on the input signal to obtain a feedback signal and output the feedback signal to the predistortion module 12. After receiving the input feedback signal, the predistortion module 12 may update the input signal for predistortion processing according to the feedback signal, for example, the predistortion module 12 may generate a corresponding predistortion signal as the updated input signal according to the amplitude and phase distortion characteristics of the feedback signal.
The control module 22 may control the operating state of the power amplifier module 14, for example, control the state parameter of the power amplifier module 14 according to a preset power amplifier parameter, such as adjusting the gate voltage and the temperature compensation in the power amplifier module 14. The regulation and control module 22 can perform power detection processing on the output feedback signal from the feedback output end of the power coupling module 18 to obtain the power of the feedback signal. It can be understood that, when the feedback signal is a single-frequency signal, the regulation and control module 22 may obtain the power of the single-frequency signal; when the feedback signal is a plurality of single-frequency signals, for example, when the input signal is a multi-frequency signal, the adjusting and controlling module 22 may perform power detection processing on each single-frequency signal, so as to obtain the power of each single-frequency signal. The adjusting and controlling module 22 may further adjust the amplitude and the phase of the updated input signal in the predistortion module 12 according to the power of the feedback signal and the correction error parameter of the predistortion module 12, that is, the amplitude and the phase of the output signal of the predistortion module 12 may be adjusted, so that the compensation provided by the predistortion module 12 offsets the nonlinearity of the power amplifier module 14, and the amplified input signal obtains the expected linear effect. Thus, the input signal after the linearization processing can be timely output from the power coupling module 18 to the pilot frequency combining module 20, and output to the signal transmitting module through the pilot frequency combining module 20. For example, if the input signal is a single-frequency signal, the pilot combining module 20 may directly output the single-frequency signal to the signal transmitting module. For another example, if the input signal is a plurality of single-frequency signals, the different-frequency combining module 20 combines the plurality of single-frequency signals into a plurality of multi-frequency signals, and outputs the multi-frequency signals to the signal transmitting module.
In the power amplifier device 100, each corresponding module has high technical maturity and good reliability, and by applying the corresponding modules and the regulation and control module 22, the structural size of the power amplifier device 100 is greatly reduced while the multi-frequency signal predistortion and power amplification are effectively realized, and the manufacturing, operation and maintenance costs are effectively reduced.
Referring to fig. 2, in one embodiment, the regulation module 22 includes a control circuit 222 and a detection circuit 224. The power detection terminal of the control circuit 222 is connected to the detection output terminal of the detection circuit 224. The signal correction control terminal of the control circuit 222 is connected to the control terminal of the predistortion module 12. The power amplifier control terminal of the control circuit 222 is connected to the control terminal of the power amplifier module 14. The detection input of detection circuit 224 is connected to the feedback output of power coupling module 18.
The control circuit 222 may be, but is not limited to, a digital logic circuit, a CPU, or an MCU. The detector circuit 224 may be a single-frequency detector circuit module or a multi-frequency detector circuit module.
Specifically, the detection circuit 224 can detect the output feedback signal from the feedback output terminal of the power coupling module 18 to obtain the power of the feedback signal, convert the power into a corresponding voltage signal, and output the voltage signal to the control circuit 222. The control circuit 222 may further control an amplitude adjustment unit and a phase adjustment unit in the predistortion module 12 according to the voltage signal corresponding to the power of the feedback signal, so as to adjust the amplitude and the phase of the updated input signal. It can be understood that, the signal channel corresponding to each frequency in the predistortion module 12 has an amplitude adjustment and phase adjustment unit, so the control circuit 222 can control the amplitude adjustment and phase adjustment unit of the predistortion module 12 to perform amplitude and phase adjustment on the input signal passing through the corresponding signal channel by controlling the output voltage of its digital-to-analog conversion circuit. For example, the control circuit 222 obtains the digital quantity corresponding to the voltage signal through a single-channel or multi-channel analog-to-digital conversion circuit inside itself. The control circuit 222 performs the correlation calibration on the feedback signal corresponding to a certain dynamic rf output power in each frequency band, that is, each digital quantity corresponds to an output power, and represents a certain output power value by using the digital quantity, so that the control circuit 222 can adjust the digital quantity corresponding to each path of the input signal amplified by the power amplifier module 14 according to the requirement, thereby controlling the amplitude adjustment and phase adjustment unit in the predistortion module 12 according to the digital quantity and the correction error parameter, so as to update the amplitude and phase of the input signal.
Through the control circuit 222 and the detection circuit 224, the power detection of the feedback signal and the amplitude and phase adjustment of the updated input signal can be effectively realized, so that the input signal after passing through the predistortion module 12 can obtain a better linear effect after passing through the power amplifier module 14. The whole circuit structure is simple, and the cost can be effectively reduced.
In one embodiment, the control circuit 222 comprises a microprocessor. Preferably, in this embodiment, the control circuit 222 may be a microprocessor, such as a CPU, or a single chip microcomputer, which is conventional in the art. As long as it is capable of efficiently implementing the power reception and processing of the feedback signal and providing the desired control functions to the predistortion module 12 and the power amplifier module 14. The microprocessor or the single chip microcomputer has high signal processing efficiency, high response speed and good reliability, so that the overall size of the power amplifier device 100 can be further reduced and the operation and maintenance cost of the overall device can be further reduced by applying the microprocessor or the single chip microcomputer.
In one embodiment, detector circuit 224 comprises a multi-frequency detector circuit. Preferably, in this embodiment, the detector circuit 224 may be a multi-frequency detector circuit, for example, a detector circuit 224 having two or more different frequency channels, and may detect two or more feedback signals having different frequencies to obtain the power of the two or more feedback signals having different frequencies.
Thus, by using the multi-frequency detection circuit, the detection processing of the dual-frequency or multi-frequency feedback signal corresponding to the dual-frequency or multi-frequency input signal can be realized, so that the control circuit 222 controls the predistortion module 12 to perform amplitude and phase adjustment on each updated frequency input signal according to the power of each feedback signal, thereby improving the linearity level of the signal output to the signal transmitting module and the maintainability of the whole machine.
Referring to fig. 3, in one embodiment, the predistortion module 12 comprises a multi-frequency predistortion circuit. The power amplifier module 14 is a broadband power amplifier circuit. The branch processing module 16 includes a multi-frequency branch processing circuit. The power coupling module 18 includes a multi-path power coupling circuit.
Preferably, the predistortion module 12 may be a dual-frequency predistortion circuit, for example, a multi-channel predistorter, and a predistorter capable of supporting predistortion processing of signals with two or more different frequencies. Similarly, it can be understood that the power amplifier module 14 may be a wideband power amplifier circuit, for example, an ultra wideband power amplifier module, and may amplify signals of various frequencies in a frequency band. The splitting processing module 16 may be configured to split the input signal into the single-frequency signals with corresponding frequencies. The power coupling module 18 may be a multi-path power coupling circuit, such as a 30dB coupler, for coupling and outputting each single-frequency signal as a feedback signal of the predistortion module 12. By applying the circuits, the linear correction of the multi-path single-frequency signals can be provided at the same time, and the manufacturing cost and the operation and maintenance cost of the whole machine are lower.
As shown in fig. 3, each of the branch output terminals of the multi-frequency branch processing circuit is respectively connected to a signal input terminal of each corresponding frequency of the multi-path power coupling circuit, for example, an output terminal of one frequency of the multi-frequency branch processing circuit is correspondingly connected to an input terminal of the same frequency of the multi-path power coupling circuit. The connections between the input and output terminals of the multi-path power coupling circuit and the pilot frequency combining module 20, the connections between the input and output terminals of the multi-path power coupling circuit and the multi-frequency detector circuit, and the connections between the input and output terminals of the multi-frequency detector circuit and the control circuit 222 can be understood in the same manner.
Referring to fig. 4, in one embodiment, the shunting processing module 16 includes a pilot frequency shunting circuit 162 and a multi-frequency filter circuit 164 connected in cascade. The input end of the pilot frequency shunt circuit 162 is connected to the output end of the power amplifier module 14. The output terminal of the multi-frequency filter circuit 164 is connected to the input terminal of the power coupling module 18.
It is understood that the above-mentioned branch processing module 16 may specifically include an inter-frequency branch circuit 162 and a multi-frequency filter circuit 164. The pilot frequency shunt circuit 162 is configured to shunt the multi-frequency input signal output by the power amplifier module 14 to obtain a plurality of single-frequency signals with different frequencies. The multi-frequency filter circuit 164 is configured to perform conventional signal filtering processing on each single-frequency signal output by the different-frequency shunt circuit 162, and output the signal to the power coupling module 18.
Specifically, the inter-frequency shunt circuit 162 may have a single input terminal and a plurality of output terminals, each output terminal being for single-frequency signal output of one of the multi-frequency input signals. The multi-frequency filter circuit 164 has a plurality of input terminals and a plurality of corresponding output terminals, each of the input terminals and the output terminals is used for passing a single-frequency signal of a corresponding frequency, and therefore, each of the output terminals of the different-frequency shunt circuit 162 is connected to the input terminal of each corresponding frequency of the multi-frequency filter circuit 164. The output terminals of the multi-frequency filter circuit 164 are respectively connected to the input terminals of the power coupling module 18 at corresponding frequencies. By applying the shunting processing module 16, after the shunting processing of the multi-frequency signal can be realized, each single-frequency signal can be filtered, and the signal processing precision of the power amplifier device 100 can be improved.
In one embodiment, a feedback filtering module 24 is also included. The input terminal of the feedback filtering module 24 is connected to the feedback output terminal of the power coupling module 18. The output end of the feedback filtering module 24 is connected to the feedback input end of the predistortion module 12 and the detection input end of the regulation and control module 22, respectively.
It is understood that the feedback filtering module 24 may be a multi-channel signal filter conventional in the art, and is used for performing signal filtering processing on each input single-frequency feedback signal. The detecting input terminals of the regulating module 22 may be connected to the output terminals of the feedback filtering module 24 at corresponding frequencies, respectively, so as to obtain the power of the feedback signal more accurately. The input end of each frequency of the feedback filtering module 24 is correspondingly connected to the feedback output end of each corresponding frequency of the power coupling module 18. The output end of each frequency of the feedback filtering module 24 is correspondingly connected to the feedback input end of each corresponding frequency of the predistortion module 12.
Specifically, after the feedback output end of each corresponding frequency of the power coupling module 18 outputs, the feedback output end enters the feedback filtering module 24 to perform filtering processing, and then the filtered feedback is output to the predistortion module 12. The control module 22 can obtain the power of the feedback signal of each single frequency from the output terminal of each corresponding frequency of the feedback filtering module 24. Thus, by setting the feedback filtering module 24 on the feedback loop, the indexes such as the signal-to-noise ratio of the feedback signal can be improved, and the signal processing precision of the power amplifier device 100 can be further improved.
As shown in fig. 4, in order to more clearly illustrate the operation principle of the power amplifier 100, a multi-frequency signal with three frequencies, such as 800MHz, 1800MHz, and 2600MHz, is taken as an example for explanation: the 800MHz &1800MHz &2600MHz radio frequency input signal enters the three predistortion modules 12 at the same time, the input signal after the predistortion processing of the predistortion module 12 enters the power amplifier module 14 and is amplified at the same time. After passing through the shunt processing module 16, the amplified input signal is divided into three single-frequency signals, which are 800MHz, 1800MHz, and 2600MHz single-frequency signals, and is filtered by the shunt processing module 16. Three single-frequency signals of 800MHz, 1800MHz, and 2600MHz enter the power coupling module 18, and the power coupling module 18 couples the three single-frequency signals as feedback signals of the predistortion module 12. The detection module detects the power value of each feedback signal and sends the power value to the control circuit 222. The control circuit 222 can determine the output power value of each signal channel in the predistortion module 12 according to the power of the feedback signal. Each path of feedback signal is sent to the predistortion module 12, and the predistortion module 12 updates the input signal for predistortion according to each path of feedback signal.
The control circuit 222 can control the predistortion module 12 to adjust the amplitude and phase of the input signal with each frequency according to the power of each feedback signal, so that the input signal reaches a better linear level after passing through the power amplifier module 14. The multi-frequency input signals composed of 800MHz, 1800MHz, 2600MHz, etc. after amplification and linearization pass through the shunt processing module 16 and the power coupling module 18 in sequence, enter the different-frequency combining module 20, are combined into linearized input signals, and are output to the signal transmitting module.
Referring to fig. 5, in an embodiment, a radio frequency signal processing system 200 is further provided, which includes a signal source 30, a signal transmitting module 40, and the power amplifier 100. The signal output end of the signal source 30 is connected to the signal input end of the power amplifier 100. The signal output end of the power amplifier 100 is connected to the signal input end of the signal transmitting module 40.
It is understood that the power amplifier 100 can be applied to the rf signal processing system 200, for example, a radio front-end link of a base station or a repeater. For the description of the signal source 30, the signal transmitting module 40 and the power amplifier device 100, reference is specifically made to the description of each corresponding embodiment in the power amplifier device 100, and details are not repeated here. By applying the power amplifier device 100, the structure volume of the power amplifier device 100 can be greatly reduced while the multi-frequency signal predistortion and power amplification are effectively realized, and the manufacturing, operation and maintenance costs are effectively reduced.
In one embodiment, signal source 30 comprises a digital radio frequency integrated board. The signal transmission module 40 includes a multi-frequency antenna. It can be understood that the signal source 30 may be a digital radio frequency integrated board in the art, and is used for inputting information to be transmitted to the power amplifier device 100 in a radio frequency signal manner, so that the power amplifier device 100 performs pre-distortion, amplification and other processing to obtain a linearized radio frequency signal, and then outputs the linearized radio frequency signal to the signal transmitting module 40 for transmission. Accordingly, the signal transmitting module 40 may be, but is not limited to, a multi-frequency antenna for implementing external transmission of radio frequency signals. By applying the digital radio frequency integrated board and the multi-frequency antenna, the signal transmission is reliably realized, and the increase of the system cost is avoided.
In one embodiment, a base station is also provided, which includes the above-mentioned radio frequency signal processing system 200. The base station may be various types of base stations in the art, such as, but not limited to, a multi-frequency small cell base station. It is understood that the above-mentioned rf signal processing system 200 in the base station is only one component, and not all the components of the base station, and the base station also includes other necessary hardware structures in the prior art, and will not be described again in this specification. The rf signal processing system 200 can be applied to a base station, so as to implement low-cost and high-linearity pre-distortion and power amplification processing on a multi-frequency signal. The base station using the rf signal processing system 200 can reduce the size and the operation and maintenance cost.
The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above examples only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (8)
1. A power amplifier device is characterized by comprising a predistortion module, a power amplifier module, a shunt processing module, a power coupling module, a regulation and control module and a pilot frequency combining module; the predistortion module comprises a multi-frequency predistortion circuit, the power amplifier module is a broadband power amplifier circuit, the shunt processing module comprises a multi-frequency shunt processing circuit, and the power coupling module comprises a multi-path power coupling circuit;
the predistortion module, the power amplifier module, the shunt processing module and the power coupling module are sequentially connected, a feedback output end of the power coupling module is connected to a feedback input end of the predistortion module, a signal output end of the power coupling module is connected to an input end of the pilot frequency combining module, and an output end of the pilot frequency combining module is used for being connected with a signal transmitting module;
the detection input end of the regulation and control module is connected with the feedback output end of the power coupling module, the signal correction control end of the regulation and control module is connected with the control end of the predistortion module, and the power amplification control end of the regulation and control module is connected with the control end of the power amplification module;
the predistortion module is used for connecting a signal source, and the regulation and control module is used for controlling the working state of the power amplification module and regulating the amplitude and the phase of an output signal of the predistortion module according to the power of a feedback signal output by the power coupling module and a correction error parameter of the predistortion module.
2. The power amplifier device of claim 1, wherein the regulation and control module comprises a control circuit and a detection circuit;
the power detection end of the control circuit is connected with the detection output end of the detection circuit, the signal correction control end of the control circuit is connected with the control end of the predistortion module, the power amplifier control end of the control circuit is connected with the control end of the power amplifier module, and the detection input end of the detection circuit is connected with the feedback output end of the power coupling module.
3. The power amplifier device of claim 2, wherein the control circuit comprises a microprocessor or a single chip microcomputer.
4. The power amplifier apparatus according to claim 2 or 3, wherein the detector circuit comprises a multifrequency detector circuit.
5. The power amplifier device according to claim 1, wherein the shunting processing module includes a different-frequency shunting circuit and a multi-frequency filter circuit, which are cascaded, an input terminal of the different-frequency shunting circuit is connected to an output terminal of the power amplifier module, and an output terminal of the multi-frequency filter circuit is connected to an input terminal of the power coupling module.
6. A radio frequency signal processing system, characterized in that, including signal source, signal emission module and the power amplifier device of any one of the above claims 1 to 5, the signal output terminal of the signal source is connected with the signal input terminal of the power amplifier device, the signal output terminal of the power amplifier device is connected with the signal input terminal of the signal emission module.
7. The radio frequency signal processing system according to claim 6, wherein the signal source comprises a digital radio frequency integrated board, and the signal transmission module comprises a multi-frequency antenna.
8. A base station, characterized in that it comprises a radio frequency signal processing system according to claim 6 or 7.
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| US6384681B1 (en) * | 2000-01-07 | 2002-05-07 | Spectrian Corporation | Swept performance monitor for measuring and correcting RF power amplifier distortion |
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| CN102291347B (en) * | 2011-09-02 | 2014-10-29 | 大唐移动通信设备有限公司 | DPD (Digital Pre-Distortion) processing method and equipment based on multiband spectrum |
| CN103023842B (en) * | 2012-11-26 | 2016-08-24 | 大唐移动通信设备有限公司 | A kind of Multiband pre-distortion factor lookup table update method and system |
| CN104393844B (en) * | 2014-10-27 | 2017-10-31 | 京信通信系统（中国）有限公司 | Power amplifying system and its processing method |
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| CN208707597U (en) * | 2018-08-29 | 2019-04-05 | 京信通信系统（中国）有限公司 | Power amplification device, radiofrequency signal processing system and base station |
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| CN102361476A (en) * | 2011-07-29 | 2012-02-22 | 上海交通大学 | Apparatus and method for digital predistortion of broadband multi-band power amplifier |
| CN105978493A (en) * | 2016-04-26 | 2016-09-28 | 京信通信系统（广州）有限公司 | Ultra wide band multifrequency multimode power amplification system |
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