CN101662435A - Device and method for obtaining and adjusting digit pre-distortion parameters - Google Patents
Device and method for obtaining and adjusting digit pre-distortion parameters Download PDFInfo
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Abstract
The invention discloses a device and a method for obtaining and adjusting digit pre-distortion parameters, wherein the method for obtaining and adjusting digit pre-distortion parameters comprises: detecting a forward signal channel and a backward signal channel; judging whether needing a DPD pre-training according to the result of detection; when needing the DPD pre-training, inputting a preset training signal to a DPD module; training the training signal by the DPD module to obtain a DPD parameter; and applying the DPD parameter on a baseband signal by the DPD module to obtain a signal to besent into the forward signal channel. The invention solves the problems that a long time is required for obtaining a group of optimal pre-distortion parameters in related technologies and intermodulation index can not be fast stabilized under all conditions, thus achieving the effects on improving stability of index intermodulation and property of digit pre-distortion.
Description
Technical field
The present invention relates to the communications field, in particular to the obtaining of a kind of digit pre-distortion parameters, adjusting device and method.
Background technology
Digital pre-distortion technology is widely used in the wireless communication field as the mainstream technology of correcting the power amplifier linearity at present.Digital pre-distortion technology generally is to insert one " nonlinear block " between input signal after the modulation and main power amplifier level, the transmission feature that this nonlinear block accurately produces after the anti-phase signal of intermodulation distortion that produces with power amplifier makes both make up presents the linearisation characteristic, thereby eliminates any non-linear distortion that causes that power amplifier produces.Come a minute digital predistortion to mainly contain base band framework, middle radio frequency injection framework and power tube bias voltage according to system architecture at present and adjust structure.
Fig. 1 is the structural representation of digital pre-distortion (Digital PreDistortion the abbreviates DPD as) equipment according to correlation technique.
As shown in Figure 1, the digital pre-distortion model of traditional base band framework is by comparing the digital signal of feedback signal and input, with the generation pre-distortion parameters, and then pre-distortion parameters is acted on the digital signal of input, output is through the digital signal of pre-distortion at last.In Fig. 1, DAC represents digital to analog converter (Digital to Analog Converter abbreviates DAC as), ADC represents analog to digital converter (Analog to Digital Converter, abbreviate ADC as), PA represents radio-frequency power amplifier (Power Amplifier abbreviates PA as).
This base band digital predistortion model, the process of a parameter stability of existence promptly needs iteration repeatedly could obtain pre-distortion parameters more accurately.In the Multi-Carrier basestation practical application, synchronization is not all to have information to exist on each carrier wave, and carrier power also is at any time what change, and the pre-distortion parameters that will obtain one group of optimum so needs long time.Along with the variation of carrier number and carrier power, the intermodulation performance of base station has than great fluctuation process, just can not in all cases can both fast and stable intermodulation index.
At the pre-distortion parameters that will obtain one group of optimum in the correlation technique need long time and can not be in all cases can both fast and stable intermodulation index problem, effective solution is not proposed at present as yet.
Summary of the invention
At the pre-distortion parameters that will obtain one group of optimum in the correlation technique need long time and can not be in all cases can both fast and stable intermodulation index problem and the present invention is proposed, for this reason, main purpose of the present invention is to provide the obtaining of a kind of digit pre-distortion parameters, adjusting device and method, to address the above problem.
To achieve these goals, according to an aspect of the present invention, provide a kind of deriving means of digit pre-distortion parameters.
Deriving means according to digit pre-distortion parameters of the present invention comprises: pre-training signal generation module is used to generate training signal; Control module is used to be switched on or switched off pre-training signal generation module to digital pre-distortion module output training signal; The digital pre-distortion module is used for carrying out the digital pre-distortion training to obtain digit pre-distortion parameters according to pre-training signal.
To achieve these goals, according to another aspect of the present invention, provide a kind of adjusting device of digit pre-distortion parameters.
Adjusting device according to digit pre-distortion parameters of the present invention comprises: digital pre-distortion module, forward signal passage, reverse signal passage, radio-frequency power amplifier also comprise: pre-training signal generation module is used to generate training signal; Control module is used to be switched on or switched off pre-training signal generation module to digital pre-distortion module output training signal; The digital pre-distortion module is carried out the digital pre-distortion training obtaining digit pre-distortion parameters according to pre-training signal, and digit pre-distortion parameters is acted on baseband digital signal to obtain being sent to the signal of forward signal passage.
Preferably, control module also is used for extracting digit pre-distortion parameters from the digital pre-distortion module.
Preferably, said apparatus also comprises: the parameter access module, be used to preserve the digit pre-distortion parameters that control module is extracted, under the situation that does not need the pre-training of digital pre-distortion, control module also is used for extracting digit pre-distortion parameters from the parameter access module, and digit pre-distortion parameters is sent in the digital pre-distortion module.
Preferably, the parameter access module also is used to preserve the digital pre-distortion link information.
Preferably, control module also specifically is used for the digital pre-distortion loop that forward signal passage, reverse signal passage and digital pre-distortion module are formed is carried out latency measurement, and forward signal passage and reverse signal passage are carried out the calibration of power.
To achieve these goals, according to a further aspect in the invention, provide a kind of acquisition methods of digit pre-distortion parameters.
Acquisition methods according to digit pre-distortion parameters of the present invention comprises: forward signal passage and reverse signal passage are detected; Judge whether that according to the result who detects needs carry out digital pre-distortion and train in advance; Under the situation that needs the pre-training of digital pre-distortion, to the default training signal of digital pre-distortion module input; The digital pre-distortion module is trained training signal and is obtained digit pre-distortion parameters.
Preferably, the digital pre-distortion module training signal is trained obtain digit pre-distortion parameters after, this method also comprises: extract digit pre-distortion parameters and preserve from the digital pre-distortion module, wherein, under the situation that does not need the pre-training of digital pre-distortion, method also comprises: the digit pre-distortion parameters that extracts is sent to the digital pre-distortion module.
Preferably, under the situation of digital pre-distortion link occurs fault, this method also comprises: the digital pre-distortion module is trained to obtain digit pre-distortion parameters again to training signal.
Preferably, this method also comprises: the digital pre-distortion module acts on baseband signal to obtain being sent to the signal of forward signal passage with digit pre-distortion parameters.
By the present invention, adopt forward signal passage and reverse signal passage are detected; Judge whether that according to the result who detects needs carry out DPD and train in advance; Under the situation that needs the pre-training of DPD, to the default training signal of DPD module input; The DPD module is trained training signal and is obtained the DPD parameter; The DPD module with the DPD parameter role in baseband signal to obtain being sent to the signal of forward signal passage, solved the pre-distortion parameters that will obtain one group of optimum in the correlation technique need long time and can not be in all cases can both fast and stable intermodulation index problem, and then reached and improved the stability of intermodulation and the effect of digital pre-distortion performance.
Description of drawings
Accompanying drawing described herein is used to provide further understanding of the present invention, constitutes the application's a part, and illustrative examples of the present invention and explanation thereof are used to explain the present invention, do not constitute improper qualification of the present invention.In the accompanying drawings:
Fig. 1 is the structural representation according to the DPD equipment of correlation technique;
Fig. 2 is the structural representation according to the DPD equipment of the embodiment of the invention;
Fig. 3 is the structural representation according to the preferred DPD equipment of the embodiment of the invention;
Fig. 4 is the flow chart according to the acquisition methods of the pre-distortion parameters of the embodiment of the invention;
Fig. 5 is the flow chart according to the acquisition methods of the preferred pre-distortion parameters of the embodiment of the invention;
Fig. 6 is the schematic diagram according to the deriving means of the digit pre-distortion parameters of the embodiment of the invention.
Embodiment
Functional overview
Consider the pre-distortion parameters that will obtain one group of optimum in the correlation technique need long time and can not be in all cases can both fast and stable intermodulation index, the embodiment of the invention provides the obtaining of a kind of digit pre-distortion parameters, adjusting device and method.This device comprises: pre-training signal generation module is used to generate training signal; Control module is used to be switched on or switched off pre-training signal generation module to DPD module output training signal; The DPD module is carried out the DPD training obtaining the DPD parameter according to pre-training signal, and with the DPD parameter role in baseband digital signal to obtain being sent to the signal of forward signal passage.
The present invention has increased control module, pre-training signal generation module and parameter access module on the basis of existing DPD equipment, wherein, control module is by controlling the existing handled signal of DPD equipment and handling process and optimizing, to be saved in the memory in order to directly extracting after the device power than the DPD parameter of optimizing, improve the stability and the digital pre-distortion performance of DPD module.
Need to prove that under the situation of not conflicting, embodiment and the feature among the embodiment among the application can make up mutually.Describe the present invention below with reference to the accompanying drawings and in conjunction with the embodiments in detail.
Be described in detail below in conjunction with the implementation procedure of example the embodiment of the invention.
Fig. 2 is the structural representation according to the DPD equipment of the embodiment of the invention.
As shown in Figure 2, this device comprises: pre-training signal generation module 307 is used to generate training signal; Control module 309 is used to be switched on or switched off pre-training signal generation module to DPD module output training signal; DPD module 305 is carried out the DPD training obtaining the DPD parameter according to pre-training signal, and with the DPD parameter role in baseband digital signal to obtain being sent to the signal of forward signal passage.
Fig. 6 is the schematic diagram according to the deriving means of the digit pre-distortion parameters of the embodiment of the invention.
As shown in Figure 6, the deriving means according to the digit pre-distortion parameters of the embodiment of the invention can comprise: pre-training signal generation module 307, control module 309, digital pre-distortion module 305.
Particularly, pre-training signal generation module 307 is used to generate training signal; Control module 309 is used to be switched on or switched off pre-training signal generation module to digital pre-distortion module output training signal; Digital pre-distortion module 305 is used for carrying out the digital pre-distortion training to obtain digit pre-distortion parameters according to pre-training signal.
Fig. 3 is the structural representation according to the preferred DPD equipment of the embodiment of the invention.
As shown in Figure 3, a kind of system that improves GSM Multi-Carrier basestation digital pre-distortion performance and stability, this device comprises DPD module 305, forward signal passage 301, reverse signal passage 303, radio-frequency power amplifier, control module 309, pre-training signal generation module 307, parameter access module 311.
Wherein, the collaborative pre-training signal generation modules of control module 309 and 311 pairs of DPD modules of parameter access module 305 are carried out flow process control and optimization process, realize the fast and stable and the performance boost of whole DPD system.
303 pairs of signals that coupling is returned after radio-frequency power amplifier amplifies of reverse signal passage carry out down-conversion, deliver to DPD module 305, as feedback input signal.
The forward signal of 301 pairs of digital predistortion module outputs of forward signal passage carries out upconversion process, and delivers to radio-frequency power amplifier and carry out power amplification.
Parameter memory module 311 is used for access digit pre-distortion parameters and DPD link information.
Pre-training signal generation module 307, the multi-carrier signal that is used to produce unequal interval is delivered to the DPD module.
In the DPD module 305 shown in Fig. 3, forward signal passage 301, reverse signal passage 303 and radio-frequency power amplifier are existing in the prior art, do not do concrete elaboration at this.
Above-mentioned control module 309 can be used for system channel and detect, the control of DPD flow process, DPD module 305 parameter configuration, selection is input to the signal path of DPD module 305, dispose pre-training signal generation module relevant parameter, preserve the DPD parameter, extract the DPD parameter to DPD module 305 to memory.Just play and coordinate pre-training signal generation module, parameter access module 311 and DPD module 305 are carried out the effect of work.
Wherein, the detailed process that control module 309 is carried out the passage detection is: after system's electrifying startup, can detect DPD forward signal passage 301 and reverse signal passage 303, alternatively, can carry out by forward signal passage 301, the latency measurement of the DPD loop that reverse signal passage 303 and DPD module 305 are formed, the forward signal passage 301 and the calibration of power of reverse signal passage 303 and reading of Primary Component information.
Above-mentioned passage detection is the multicarrier data by the unequal interval of the pre-training signal generation module generation of gating, control module 309 calculating forward signal power and reverse signal power obtain the power information on the DPD loop, and this passage detection can also comprise reads Primary Component information and configuration information.Time delay and power all are parameters important in the DPD processing procedure, are directly connected to the performance of DPD.
In order accurately to obtain time delay and the power information on the DPD loop, must adopt more stable signal to detect, and there is bigger randomness in the practical base-band signal, so can not detect with baseband signal.Pre-training signal generation module among the present invention is exactly special in generating stable signal, and the signal that this module produces can be used for passage and detects, thereby obtains more accurate delay parameter and power parameter.Except the measurement of carrying out time delay and power, also comprise the information that some other is necessary, as PA information, information of Primary Component etc. on the DPD loop.After obtaining these necessary parameter, control module 309 need be preserved these parameters, judges and disposes in order to back DPD handling process.
The detailed process that above-mentioned control module 309 is carried out DPD module 305 parameter configuration and the control of DPD flow process is: control module 309 is configured to DPD module 305 according to the result that passage detects with relevant parameter.Then, control module 309 need judge whether that needs carry out DPD and train in advance according to the information that passage detects.Here the foundation of Pan Duaning is whether Primary Component information and configuration parameter on the DPD loop changes, with current detection to information be kept at the information that parameter preserves in the module and compare, as PA information, configuration information etc., if, then needing to carry out DPD trains in advance, because originally stored parameters can not well adapt to the environment that has changed, simultaneously up-to-date device information and configuration parameter are saved to parameter access module 311, if not, then not needing to carry out DPD trains in advance, directly carry out the DPD parameter extraction, also do not need DPD loop Primary Component information and configuration parameter in the undated parameter access module 311.
The pre-training need gating of DPD training signal is delivered to DPD module 305, and training signal is produced by pre-training signal generation module, and training signal is one group of unequal interval, the multi-carrier signal of full power output.Then, the control that 309 pairs of DPD modules of control module 305 are carried out on the flow process starts DPD training flow process, after obtaining more stable DPD parameter, suspends DPD and handles, and control module 309 comes out to be saved in the parameter access module 311 with the DPD parameter extraction.After the DPD parameter is preserved and is finished, the gating baseband signal, the DPD that resumes operation handles.
Do not need to carry out the DPD training if control module 309 is judged, then direct gating baseband signal is taken out the DPD parameter then from the coefficient access module, starts the DPD processing then.
The signal that need use when above-mentioned pre-training signal generation module is used to generate the signal of forward signal passage 301 and 303 self checks of reverse signal passage and DPD training.All there is certain randomness in the multicarrier base band data on carrier number and power, passage detects and the DPD training if be used for, the DPD parameter of the most situations of energy fast adaptation that can not relatively be optimized.And adopt pre-training signal generation module to generate to detect and the signal of DPD training, can accomplish to generate signal may command and optimization, adopt this signal to carry out that passage detects and the DPD training can be detected information accurately and than the DPD parameter of optimization.Among the present invention, pre-training signal generation module carries out interpolation and filtering by the base band data source to one group of low rate of pre-access, obtain up-conversion data afterwards, this module produces is that spacing between the carrier wave is unequal, satisfy the signal of the specified maximum transmission power in base station, adopt the multi-carrier signal of unequal interval full power configuration can obtain the relatively DPD parameter of optimization, can adapt to distinctive frequency hopping characteristic of gsm system and power fluctuation characteristic.
Above-mentioned parameter access module 311 is used to preserve the DPD parameter, forward signal passage 301 information, the information that DPD such as reverse signal passage 303 information and PA information operation is necessary.
According to embodiments of the invention, provide a kind of acquisition methods of pre-distortion parameters.
Fig. 4 is the flow chart according to the acquisition methods of the pre-distortion parameters of the embodiment of the invention.
As shown in Figure 4, this method comprises that following step S402 is to step S410:
Step S402 detects forward signal passage and reverse signal passage;
Step S404 judges whether that according to the result who detects needs carry out DPD and train in advance;
Step S406, under the situation that needs the pre-training of DPD, to the default training signal of DPD module input, described default training signal can be the multi-carrier signal of unequal interval;
Step S408, the DPD module is trained training signal and is obtained the DPD parameter.
Preferably, said method can also comprise: the DPD module with the DPD parameter role in baseband signal to obtain being sent to the signal of forward signal passage.
Fig. 5 is the flow chart according to the acquisition methods of the preferred pre-distortion parameters of the embodiment of the invention.
Implementation of the present invention can be divided into two flow processs, one is DPD training flow process, be " to judge whether to carry out the DPD training " among Fig. 5 to be the branch of "Yes", one is DPD parameter extraction flow process, promptly " judges whether to carry out the DPD training " among Fig. 5 and is the branch of "No".This DPD system is after having preserved one group of DPD parameter generally speaking, if do not have Primary Component or configuration parameter to change, be not need to carry out the DPD training, can directly carry out DPD parameter extraction flow process, under the prerequisite that guarantees the DPD performance, improve the stabilized speed of DPD system so greatly, strengthened adaptive capacity various baseband signals.Otherwise, just need to carry out DPD training flow process.
Particularly, as shown in Figure 5, can may further comprise the steps according to the acquisition methods of the preferred pre-distortion parameters of the embodiment of the invention:
Step S501, system powers on.
Step S502, the training signal of gating unequal interval, control module 309 disposes pre-training signal generation module after system powers on, make its output unequal interval full power training signal to DPD module 305.
Step S503, control module 309 uses training signals to carry out forward signal and reverse signal detects, and preserves link information, i.e. PA information, the time delay information of power information and DPD loop.
Step S504, control module 309 judges whether that according to the system channel testing result needs carry out DPD and train in advance, carries out DPD training if desired and then changes step S505, if do not need then change the step S509 that carries out in the DPD parameter extraction flow process over to.
Step S505, control module 309 starts DPD training flow process, adopt the multicarrier training signal of unequal interval to train, the training at this place can be to replace baseband signal and carry out digital pre-distortion with the unequal interval multi-carrier signal, thereby draws more stable and DPD parameter optimization.
Step S506, control module 309 is suspended the DPD flow process, extracts the DPD parameter and be saved in parameter access module 311 from DPD module 305.
Step S507, control module 309 gating baseband signals are delivered to DPD module 305.
Step S508, operation DPD handles.
Step S509, the gating baseband signal.
Step S510 gets the DPD parameter to DPD module 305 from memory.
Step S511, operation DPD handles.
Preferably, this method can be divided into two flow processs according to whether needs carry out the DPD training, and one is DPD training flow process, and one is DPD parameter extraction flow process.Under the situation that the Primary Component on the DPD link or information change, need to carry out DPD parameter extraction flow process, can shorten the DPD processing time greatly like this, the mode of the DPD parameter by extracting storage can also improve the stabilized speed that DPD handles.Because the DPD parameter draws by training one group of distinctive signal, the changeable baseband signal of this group parameter energy fast adaptation is so this invention also can improve the DPD performance.Have only Primary Component (as PA) on the DPD link and configuration information (as power) when changing, just start DPD training flow process and obtain the DPD parameter again.
Wherein, DPD training flow process may further comprise the steps:
After A, system power on, control module 309 gating training signals are delivered to DPD module 305, carrying out system forward passage and backward channel then detects, comprise the measurement of crucial cell configuration information on time delay, power and the link, DPD module 305 will be carried out the digital pre-distortion processing according to these metrical informations, to obtain optimum DPD parameter;
B, control module 309 judge whether current device needs to carry out DPD and train in advance, if judge to need, then continue to carry out following steps, if do not need then change D step in the DPD parameter extraction flow process over to;
The unequal interval multi-carrier signal that C, DPD module 305 adopt pre-training signal generation module to produce carries out the DPD training, and the training at this place can be to replace baseband signal and carry out digital pre-distortion with the unequal interval multi-carrier signal, thereby generates the DPD parameter;
D, control module 309 extract the relevant information of DPD parameter and forward signal passage 301, reverse signal passage 303 and PA from DPD module 305, are saved to parameter access module 311;
E, control module 309 gating baseband digital signals are delivered to DPD module 305;
F, DPD module 305 operation DPD handle.
The concrete steps of DPD parameter extraction flow process comprise:
A, control module 309 dispose pre-training signal generation module after system powers on, make its output unequal interval full power training signal to DPD module 305;
B, control module 309 uses training signals to carry out forward signal and reverse signal detects, and preserves link information, i.e. PA information, the time delay information of power information and DPD loop;
C, control module 309 judge whether to carry out DPD and train in advance, for example can detect the chain-circuit time delay of storing in the result obtain and the parameter memory module with system channel, power, PA information and DPD link information compare, if wherein any one changes then need to carry out DPD and trains in advance, do not train in advance otherwise do not need to carry out DPD.Wherein, if do not need the pre-training of DPD then the following step of execution, the pre-training of DPD then changes the C step of carrying out in the DPD training flow process over to if desired;
D, control module 309 gating baseband signals are delivered to DPD module 305;
E, control module 309 are taken out the DPD parameter from parameter access module 311, deliver to DPD module 305, start DPD and handle.
As can be seen from the above description, the present invention has realized following technique effect:
The present invention proposes the method for a kind of GSM Multi-Carrier basestation digital pre-distortion performance and stability, owing to adopted pre-training technique of unequal interval signal and parameter access technique, has improved performance and the stability of DPD greatly.
Obviously, those skilled in the art should be understood that, above-mentioned each module of the present invention or each step can realize with the general calculation device, they can concentrate on the single calculation element, perhaps be distributed on the network that a plurality of calculation element forms, alternatively, they can be realized with the executable program code of calculation element, thereby, they can be stored in the storage device and carry out by calculation element, perhaps they are made into each integrated circuit modules respectively, perhaps a plurality of modules in them or step are made into the single integrated circuit module and realize.Like this, the present invention is not restricted to any specific hardware and software combination.
The above is the preferred embodiments of the present invention only, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. the deriving means of a digit pre-distortion parameters is characterized in that, comprising:
Pre-training signal generation module is used to generate training signal;
Control module is used to be switched on or switched off described pre-training signal generation module and exports described training signal to described digital pre-distortion module;
The digital pre-distortion module is used for carrying out the digital pre-distortion training to obtain digit pre-distortion parameters according to described pre-training signal.
2. the adjusting device of a pre-distortion parameters comprises digital pre-distortion module, forward signal passage, reverse signal passage, radio-frequency power amplifier, it is characterized in that described device also comprises:
Pre-training signal generation module is used to generate training signal;
Control module is used to be switched on or switched off described pre-training signal generation module and exports described training signal to described digital pre-distortion module;
Described digital pre-distortion module is carried out digital pre-distortion training obtaining digit pre-distortion parameters according to described pre-training signal, and described digit pre-distortion parameters is acted on baseband digital signal to obtain being sent to the signal of described forward signal passage.
3. device according to claim 2 is characterized in that, described control module also is used for extracting described digit pre-distortion parameters from described digital pre-distortion module.
4. device according to claim 3 is characterized in that, described device also comprises:
The parameter access module, be used to preserve the described digit pre-distortion parameters that described control module is extracted, under the situation that does not need the pre-training of digital pre-distortion, described control module also is used for extracting described digit pre-distortion parameters from described parameter access module, and described digit pre-distortion parameters is sent in the described digital pre-distortion module.
5. device according to claim 4 is characterized in that, described parameter access module also is used to preserve the digital pre-distortion link information.
6. according to each described device in the claim 2 to 5, it is characterized in that, described control module also specifically is used for the digital pre-distortion loop that described forward signal passage, described reverse signal passage and described digital pre-distortion module are formed is carried out latency measurement, and described forward signal passage and described reverse signal passage are carried out the calibration of power.
7. the acquisition methods of a pre-distortion parameters is characterized in that, comprising:
Forward signal passage and reverse signal passage are detected;
Result according to described detection judges whether that needs carry out digital pre-distortion and train in advance;
Under the situation that needs the pre-training of digital pre-distortion, to the default training signal of digital pre-distortion module input;
Described digital pre-distortion module is trained described training signal and is obtained digit pre-distortion parameters.
8. method according to claim 7 is characterized in that, described digital pre-distortion module described training signal is trained obtain digit pre-distortion parameters after, described method also comprises:
From described digital pre-distortion module, extract described digit pre-distortion parameters and preserve,
Wherein, under the situation that does not need the pre-training of digital pre-distortion, described method also comprises: the described digit pre-distortion parameters that will extract sends to described digital pre-distortion module.
9. according to claim 7 or 8 described methods, it is characterized in that under the situation of digital pre-distortion link occurs fault, then described method also comprises: described digital pre-distortion module is trained to obtain digit pre-distortion parameters again to described training signal.
10. according to claim 7 or 8 described methods, it is characterized in that described method also comprises:
Described digital pre-distortion module acts on baseband signal to obtain being sent to the signal of described forward signal passage with described digit pre-distortion parameters.
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| CN102217262A (en) * | 2011-06-03 | 2011-10-12 | 华为技术有限公司 | Method for transmitting radio frequency signals and base station device |
| 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 |
| CN102572874A (en) * | 2011-12-12 | 2012-07-11 | 中兴通讯股份有限公司 | Digital pre-distortion (DPD) parameter monitoring device and method |
| CN102790978A (en) * | 2011-05-17 | 2012-11-21 | 中兴通讯股份有限公司 | Method and device for signal correction in global system for mobile communication (GSM) |
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