CN109951408B - DPD output correction method, system and device - Google Patents
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Abstract
The application discloses a DPD output correction method, a system and a device, which are applied to a downlink of base station RRU equipment and comprise the following steps: adding background noise signal data into the original signal data to obtain training signal data; generating a LUT using the training signal data; and processing the input signal according to the LUT to generate an output signal. The LUT in the invention is generated according to training signal data containing the background noise signal data, so that most application scenes can be covered, and when carrier configuration is switched, the LUT in the invention can effectively weaken the influence of unmatched signal and LUT characteristics in the background technology on the ACLR, improve the compatibility of the signal and relieve the deterioration condition of the ACLR.
Description
Technical Field
The present invention relates to the field of wireless communications, and in particular, to a method, a system, and an apparatus for correcting DPD output.
Background
In the existing network construction, a Radio frequency signal is amplified through a downlink of a base station device RRU (Radio Remote Unit) and then transmitted through a transmitting antenna. When designing products, each equipment manufacturer generally selects a PA (Power Amplifier) with a smaller rated Power and a higher amplification factor under the same Power level requirement based on consideration of cost, PCB layout and other factors. According to the characteristics of the PA, when the input signal power is small, the output signal power linearly changes with the input signal power, and when the input signal power is large, the output signal power cannot linearly change with the input signal power, and distortion of different degrees occurs. Aiming at the problem of signal nonlinear Distortion, a DPD (Digital Pre-Distortion) technology is introduced by many manufacturers, namely, before an input signal enters a power amplifier, the gain of the nonlinear Distortion is reversely supplemented into the input signal according to power amplifier model parameters, which is equivalent to reverse predistortion of the signal, so that after the signal enters the power amplifier, the signal can be subjected to gain compensation of the power amplifier, and the proportional amplification of the output signal and the input signal can be theoretically realized, and the nonlinear Distortion is eliminated.
However, in the application, it is found that, because the TDS (TD-SCDMA, 3 generation mobile communication technology based on a time division mechanism) and the TDL (TDD-LTE, 4 generation mobile communication technology based on a time division mechanism) of the current mobile communication network operate in a common network, a carrier configuration scene is variable, and the DPD mechanism has a certain hysteresis, and when a scene changes suddenly, there is a problem that current data and existing LUT (lookup-up Table) characteristics are not matched, an ACLR (Adjacent Channel Leakage Ratio) is suddenly deteriorated and unrecoverable, and even the PA is burned out due to excessive power.
Therefore, how to provide a solution to the above technical problems is a problem to be solved by those skilled in the art.
Disclosure of Invention
In view of the above, the present invention provides a method, a system and a device for correcting DPD output, so as to improve the compatibility of signals and alleviate the degradation of ACLR during scene switching. The specific scheme is as follows:
a DPD output correction method is applied to a downlink of a base station RRU device and comprises the following steps:
adding background noise signal data into the original signal data to obtain training signal data;
generating a LUT using the training signal data;
and processing the input signal according to the LUT to generate an output signal.
Preferably, the noise floor signal data is specifically noise floor signal data corresponding to the real-time frequency allocation information.
Preferably, the noise floor signal data is specifically noise floor signal data corresponding to the maximum frequency allocation information.
Preferably, the process of adding the background signal data to the original signal data to obtain the training signal data specifically includes:
adding a plurality of pieces of background noise signal data corresponding to different weight coefficients into original signal data to obtain training signal data of a plurality of power levels corresponding to different weight coefficients.
Preferably, the process of generating the LUT by using the training signal data specifically includes:
and generating a LUT for a plurality of the power levels using training signal data for a plurality of the power levels.
Preferably, the process of generating the output signal after processing the input signal according to the LUT specifically includes:
acquiring a target power level; the target power level is any one of a plurality of the power levels;
and processing the input signal according to the LUT corresponding to the target power level to generate an output signal.
Correspondingly, the invention also discloses a DPD output correction system, which is applied to a downlink of the RRU equipment of the base station and comprises the following steps:
the signal synthesis module is used for adding background noise signal data into the original signal data to obtain training signal data;
the signal training module is used for generating an LUT by using the training signal data;
and the signal processing module is used for processing the input signal according to the LUT and then generating an output signal.
Correspondingly, the invention also discloses a DPD output correction device, which is applied to a downlink of RRU equipment in a base station, and comprises:
the DSP is used for adding background noise signal data into the original signal data to obtain training signal data and then generating an LUT by utilizing the training signal data;
and the FPGA is used for processing the input signal according to the LUT and then generating an output signal.
Preferably, the DPD output correction apparatus further includes a memory connected to the DSP and the FPGA, and configured to store the LUT.
Preferably, the FPGA is further configured to acquire the original signal data and send the original signal data to the DSP.
The invention discloses a DPD output correction method, which is applied to a downlink of base station RRU equipment and comprises the following steps: adding background noise signal data into the original signal data to obtain training signal data; generating a LUT using the training signal data; and processing the input signal according to the LUT to generate an output signal. The LUT in the invention is generated according to training signal data containing the background noise signal data, so that most application scenes can be covered, and when carrier configuration is switched, the LUT in the invention can effectively weaken the influence of unmatched signal and LUT characteristics in the background technology on the ACLR, improve the compatibility of the signal and relieve the deterioration condition of the ACLR.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
FIG. 1 is a flowchart illustrating a method for calibrating DPD output according to an embodiment of the present invention;
FIG. 2 is a flowchart illustrating a specific DPD output calibration method according to an embodiment of the present invention;
FIG. 3 is a diagram illustrating a structure distribution of a DPD output calibration system according to an embodiment of the present invention;
fig. 4 is a structural distribution diagram of a DPD output calibration apparatus according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Because the TDS and TDL of the current mobile communication network operate in a common network, the carrier configuration scenario is variable, and the DPD mechanism has a certain hysteresis, and when the scenario changes suddenly, the problem that the current data is not matched with the characteristics of the existing LUT exists, which may cause the ACLR to deteriorate suddenly and be unrecoverable, or even cause the PA to burn out due to the excessive power.
The LUT in the invention is generated according to training signal data containing the background noise signal data, so that the characteristic of carrier configuration in an actual scene is contained, and when the carrier configuration is switched, the LUT in the invention can effectively weaken the influence of the unmatched signal and LUT characteristic in the background technology on the ACLR, improve the compatibility of the signal and relieve the deterioration condition of the ACLR.
The embodiment of the invention discloses a method for correcting DPD output, which is applied to a downlink of base station RRU equipment, and is shown in figure 1, and comprises the following steps:
s11: adding background noise signal data into the original signal data to obtain training signal data;
specifically, fluctuation of the actual scene during carrier configuration switching is considered in the bottom noise signal data, the bottom noise signal data is added into the original signal data, the compatibility margin of the obtained training signal data on carrier configuration is wider, and the influence of LUT characteristic lag and unmatched LUT and real-time input signals on ACLR during carrier configuration switching can be weakened. Under a relatively ideal condition, the bottom noise signal data corresponding to the real-time frequency allocation information can be taken as the bottom noise signal data, and it is not realistic to consider the information data updating speed, obtain the real-time frequency allocation information and execute the subsequent operation, so the bottom noise signal data corresponding to the maximum frequency allocation information, that is, the bottom noise signal data with the full bandwidth, is usually taken as the bottom noise signal data.
S12: generating a LUT using the training signal data;
s13: and processing the input signal according to the LUT to generate an output signal.
Specifically, the embodiment can be implemented by using the C language, based on the DPD function code implemented by the TI company series DSP platform, the preprocessing of the training signal data in step S11 is added, the training signal data includes the characteristics of the background noise signal data, the LUT generated through data training also has the characteristics corresponding to the background noise signal data, including the characteristics of multiple carrier configurations in an actual scene, the influence of unmatched input signals and LUT characteristics on the ACLR can be reduced when the carrier configurations are switched, and the ACLR index can be restored to a stable level after subsequent iterative training and index fluctuation in the process of transiting the switching.
It can be understood that comparing the signal processing effects of the prior art and the present embodiment: by applying the prior art, the carrier configuration change can cause the acute deterioration of the ACLR, and the index is maintained between-10 and-20 dbc, even worse; by applying the embodiment, the ACLR can be increased to-40 to-45 dbc within a few seconds after the carrier configuration is changed, and the ACLR is basically stabilized at-45 to-55 dbc after three minutes, so that the expected target is achieved, the carrier switching scene is effectively responded, and the requirement of the test specification is basically met.
The invention discloses a DPD output correction method, which is applied to a downlink of base station RRU equipment and comprises the following steps: adding background noise signal data into the original signal data to obtain training signal data; generating a LUT using the training signal data; and processing the input signal according to the LUT to generate an output signal. The LUT in the invention is generated according to training signal data containing the background noise signal data, so that most application scenes can be covered, and when carrier configuration is switched, the LUT in the invention can effectively weaken the influence of unmatched signal and LUT characteristics in the background technology on the ACLR, improve the compatibility of the signal and relieve the deterioration condition of the ACLR.
The embodiment of the invention discloses a specific DPD output correction method, and compared with the previous embodiment, the embodiment further describes and optimizes the technical scheme. Specifically, as shown in fig. 2, the method includes:
s21: adding a plurality of pieces of background noise signal data corresponding to different weight coefficients into original signal data to obtain training signal data of a plurality of power levels corresponding to different weight coefficients.
S22: and generating a LUT for a plurality of the power levels using training signal data for a plurality of the power levels.
S23: acquiring a target power level; the target power level is any one of a plurality of the power levels;
s24: and processing the input signal according to the LUT corresponding to the target power level to generate an output signal.
It can be seen that, in this embodiment, a plurality of weight coefficients are set, and corresponding to a plurality of power levels, when this embodiment is applied, an LUT of a corresponding target power level is selected according to the power level of an actual input signal to process the input signal, so that more accurate control of ACLR can be achieved.
Correspondingly, the embodiment of the present invention further discloses a DPD output correction system, which is applied to a downlink of a RRU device in a base station, and as shown in fig. 3, the DPD output correction system includes:
the signal synthesis module 01 is used for adding background noise signal data into the original signal data to obtain training signal data;
a signal training module 02, configured to generate an LUT using the training signal data;
and the signal processing module 03 is configured to process the input signal according to the LUT and generate an output signal.
The LUT in the embodiment of the invention is generated according to training signal data containing noise-floor signal data, so that the characteristic of carrier configuration in an actual scene is contained, and when the carrier configuration is switched, the LUT in the invention can effectively weaken the influence of unmatched signal and LUT characteristic on ACLR in the background technology, improve the compatibility of signals and relieve the deterioration condition of ACLR.
In some specific embodiments, the noise floor signal data is specifically noise floor signal data corresponding to real-time frequency allocation information.
In some specific embodiments, the noise floor signal data is specifically noise floor signal data corresponding to maximum frequency allocation information.
In some specific embodiments, the signal synthesis module 01 is specifically configured to:
adding a plurality of pieces of background noise signal data corresponding to different weight coefficients into original signal data to obtain training signal data of a plurality of power levels corresponding to different weight coefficients.
In some specific embodiments, the signal training module 02 is specifically configured to:
and generating a LUT for a plurality of the power levels using training signal data for a plurality of the power levels.
In some specific embodiments, the signal processing module 03 is specifically configured to:
acquiring a target power level; the target power level is any one of a plurality of the power levels;
and processing the input signal according to the LUT corresponding to the target power level to generate the output signal.
Correspondingly, the embodiment of the present invention further discloses a DPD output correction apparatus, which is applied to a downlink of a RRU device in a base station, and as shown in fig. 4, the DPD output correction apparatus includes:
the DSP 11 is used for adding background noise signal data into the original signal data to obtain training signal data, and then generating an LUT by using the training signal data;
and the FPGA 12 is used for processing the input signal according to the LUT and then generating an output signal.
In some specific embodiments, the DPD output correction apparatus further includes a memory 13 connected to the DSP and the FPGA 12 for storing the LUT.
In some specific embodiments, the FPGA 13 is further configured to obtain the raw signal data and send the raw signal data to the DSP 11.
The LUT in the embodiment of the invention is generated according to training signal data containing noise-floor signal data, so that the characteristic of carrier configuration in an actual scene is contained, and when the carrier configuration is switched, the LUT in the invention can effectively weaken the influence of unmatched signal and LUT characteristic on ACLR in the background technology, improve the compatibility of signals and relieve the deterioration condition of ACLR.
In some specific embodiments, the noise floor signal data is specifically noise floor signal data corresponding to real-time frequency allocation information.
In some specific embodiments, the noise floor signal data is specifically noise floor signal data corresponding to maximum frequency allocation information.
In some specific embodiments, the DSP 11 is specifically configured to add a plurality of pieces of background noise signal data corresponding to different weight coefficients to the original signal data to obtain training signal data of a plurality of power levels corresponding to the different weight coefficients.
In some specific embodiments, the DSP 11 is further specifically configured to generate a LUT for a plurality of said power classes using training signal data for a plurality of said power classes.
In some specific embodiments, the FPGA 12 is specifically configured to obtain a target power level; the target power level is any one of a plurality of the power levels; and processing the input signal according to the LUT corresponding to the target power level to generate the output signal.
Finally, it should also be noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The method, system and device for correcting DPD output according to the present invention are described in detail, and the principle and embodiment of the present invention are explained herein by using specific examples, and the descriptions of the above examples are only used to help understanding the method and core concept of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
Claims (8)
1. A DPD output correction method is applied to a downlink of a base station RRU device, and is characterized by comprising the following steps:
adding background noise signal data into the original signal data to obtain training signal data;
generating a LUT using the training signal data;
processing the input signal according to the LUT to generate an output signal;
the noise floor signal data includes: and the background noise signal data corresponding to the real-time frequency matching information or the background noise signal data corresponding to the maximum frequency matching information.
2. The method for correcting DPD output according to claim 1, wherein the process of adding noise-floor signal data to original signal data to obtain training signal data specifically includes:
adding a plurality of pieces of background noise signal data corresponding to different weight coefficients into original signal data to obtain training signal data of a plurality of power levels corresponding to different weight coefficients.
3. The method for correcting the DPD output according to claim 2, wherein the process of generating the LUT using the training signal data includes:
and generating a LUT for a plurality of the power levels using training signal data for a plurality of the power levels.
4. The method for correcting the DPD output according to claim 3, wherein the process of generating the output signal after processing the input signal according to the LUT specifically includes:
acquiring a target power level; the target power level is any one of a plurality of the power levels;
and processing the input signal according to the LUT corresponding to the target power level to generate the output signal.
5. A DPD output correction system is applied to a downlink of a base station RRU device, and is characterized by comprising:
the signal synthesis module is used for adding background noise signal data into the original signal data to obtain training signal data;
the signal training module is used for generating an LUT by using the training signal data;
the signal processing module is used for processing the input signal according to the LUT and then generating an output signal;
the noise floor signal data includes: and the background noise signal data corresponding to the real-time frequency matching information or the background noise signal data corresponding to the maximum frequency matching information.
6. A DPD output correction device applied to a downlink of a base station RRU device is characterized by comprising:
the DSP is used for adding background noise signal data into the original signal data to obtain training signal data and then generating an LUT by utilizing the training signal data;
the FPGA is used for processing the input signal according to the LUT and then generating an output signal;
the noise floor signal data includes: and the background noise signal data corresponding to the real-time frequency matching information or the background noise signal data corresponding to the maximum frequency matching information.
7. The apparatus of claim 6, further comprising a memory coupled to the DSP and the FPGA for storing the LUT.
8. The apparatus of claim 7, wherein the FPGA is further configured to obtain the raw signal data and send the raw signal data to the DSP.
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