CN117939540A - Compensation method, device, equipment and storage medium for broadband signal - Google Patents
Compensation method, device, equipment and storage medium for broadband signal Download PDFInfo
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- JMASRVWKEDWRBT-UHFFFAOYSA-N Gallium nitride Chemical compound [Ga]#N JMASRVWKEDWRBT-UHFFFAOYSA-N 0.000 description 15
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Abstract
The embodiment of the application provides a compensation method, a device, equipment and a storage medium for broadband signals, relates to the technical field of communication, and is used for enabling the compensated broadband signals to meet the scene of severe change of signal bandwidth. The method comprises the following steps: decomposing the wideband signal into a plurality of subcarrier signals; acquiring power and state values of each subcarrier signal in a plurality of subcarrier signals, wherein the state values of the subcarrier signals are used for representing long-time memory effect states of frequency points where the subcarrier signals are located; compensating the plurality of subcarrier signals based on the power and state values of each subcarrier signal in the plurality of subcarrier signals to obtain a plurality of compensated subcarrier signals; and combining the plurality of compensated subcarrier signals to obtain a compensated width signal.
Description
Technical Field
The present application relates to the field of communications technologies, and in particular, to a method, an apparatus, a device, and a storage medium for compensating a wideband signal.
Background
Gallium nitride (GaN) power amplifiers are widely used in base stations in the field of communications with the advantages of high efficiency, high power density, and large bandwidth. However, the GaN power amplifier has a characteristic electron trapping characteristic due to the device material, and the electron trapping characteristic of the GaN power amplifier is a phenomenon that the quiescent current of the GaN power amplifier is slowly reduced under the impulse of a periodic pulse signal. The electron trapping characteristics of GaN power amplifiers generally stabilize in milliseconds, which can cause nonlinear distortion of GaN power amplifiers to exhibit a long-term memory effect.
The existing compensation method for the long-time memory effect of the GaN power amplifier has a certain compensation effect on the long-time memory effect excited by the power mutation, but under the fifth generation mobile communication technology (5th generation mobile communication technology,5G), a scene that the signal bandwidth is changed severely occurs. The current compensation method cannot enable the compensated broadband signal to meet the scene of severe change of the signal bandwidth.
Disclosure of Invention
The application provides a compensation method, a device, equipment and a storage medium for broadband signals, which are used for enabling the compensated broadband signals to meet the scene of severe change of signal bandwidth.
In order to achieve the above purpose, the application adopts the following technical scheme:
in a first aspect, a method for compensating a wideband signal is provided, the method comprising:
decomposing the wideband signal into a plurality of subcarrier signals;
Acquiring power and state values of each subcarrier signal in a plurality of subcarrier signals, wherein the state values of the subcarrier signals are used for representing long-time memory effect states of frequency points where the subcarrier signals are located;
compensating the plurality of subcarrier signals based on the power and state values of each subcarrier signal in the plurality of subcarrier signals to obtain a plurality of compensated subcarrier signals;
And combining the plurality of compensated subcarrier signals to obtain a compensated broadband signal.
The technical scheme provided by the embodiment of the application at least has the following beneficial effects: after a wideband signal is obtained, the wideband signal is decomposed, so that the power and state values of each subcarrier signal included in the wideband signal are compensated for each subcarrier signal. The state value of one subcarrier signal is used for representing the long-time memory effect state of the frequency point of the subcarrier signal, and the long-time memory effect state of the GaN power amplifier is excited by the long-time memory effect state of the frequency point, so that the influence of the long-time memory effect of the GaN power amplifier on broadband signal transmission can be reduced by compensating each subcarrier signal according to the power and state value of each subcarrier signal, and the compensated broadband signal can meet the scene that the bandwidth of the signal is severely changed.
In some embodiments, the compensating the plurality of subcarrier signals based on the power and the state value of each subcarrier signal in the plurality of subcarrier signals to obtain a plurality of compensated subcarrier signals includes: determining an index address according to the power and state values of each subcarrier signal in the plurality of subcarrier signals; determining a compensation value corresponding to each subcarrier signal in the plurality of subcarrier signals based on the index address; and for each subcarrier signal in the plurality of subcarrier signals, compensating the subcarrier signal by using a compensation value corresponding to the subcarrier signal to obtain a compensated subcarrier signal.
In some embodiments, determining the index address according to the power and the state value of each of the plurality of subcarrier signals includes: determining a first index value according to the power of each subcarrier signal in the plurality of subcarrier signals; determining a second index value according to the state value of each subcarrier signal in the plurality of subcarrier signals; an index address is generated based on the first index value and the second index value.
In some embodiments, the first index value is equal to a weighted sum of power of each of the plurality of subcarrier signals, and the second index value is equal to a weighted sum of state values of each of the plurality of subcarrier signals.
In some embodiments, determining the compensation value corresponding to each subcarrier signal in the plurality of subcarrier signals based on the index address includes: and for each subcarrier signal in the plurality of subcarrier signals, searching a compensation value corresponding to the subcarrier signal from a lookup table corresponding to the frequency point of the subcarrier signal based on the index address.
In some embodiments, the acquiring the power and the state value of each subcarrier signal in the plurality of subcarrier signals includes: acquiring power of each subcarrier signal in a plurality of subcarrier signals; for each of the plurality of subcarrier signals, a state value of the subcarrier signal is determined based on the power of the subcarrier signal.
In some embodiments, determining the state value of the subcarrier signal according to the power of the subcarrier signal includes: performing modular value calculation on the power of the subcarrier signal to obtain an initial state value of the subcarrier signal; taking the difference value between the initial state value of the subcarrier signal and the first preset state value as the state value of the subcarrier signal under the condition that the initial state value of the subcarrier signal is larger than or equal to the state value threshold; or in case that the initial state value of the subcarrier signal is smaller than the state value threshold, taking the sum between the initial state value of the subcarrier signal and the second preset state value as the state value of the subcarrier signal.
In a second aspect, an embodiment of the present application provides a compensation device, including: and the frequency decomposition module is used for decomposing the broadband signal into a plurality of subcarrier signals.
The signal compensation module is used for acquiring the power and state value of each subcarrier signal in the plurality of subcarrier signals, and the state value of the subcarrier signal is used for representing the long-time memory effect state of the frequency point where the subcarrier signal is located; the signal compensation module is further configured to compensate the plurality of subcarrier signals based on the power and the state value of each subcarrier signal in the plurality of subcarrier signals, so as to obtain a plurality of compensated subcarrier signals.
And the merging unit is used for merging the plurality of compensated subcarrier signals to obtain a compensated width signal.
In a third aspect, an embodiment of the present application provides an electronic device, including a memory and a processor; the memory is coupled to the processor; the memory is used to store computer program code, which includes computer instructions. Wherein the computer instructions, when executed by the processor, cause the electronic device to perform the method as provided in the first aspect above.
In a fourth aspect, there is provided a computer readable storage medium storing computer instructions which, when run on a computer, cause the computer to perform a method as provided in the first aspect above.
In a fifth aspect, there is provided a computer program product comprising computer instructions which, when run on a computer, cause the computer to perform the method provided in the first aspect above.
Technical effects caused by any possible implementation manners of the second aspect to the fifth aspect may be related to technical effects caused by corresponding implementation manners of the first aspect, which are not described herein.
Drawings
The accompanying drawings are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate and do not limit the application.
Fig. 1 is a schematic diagram of a filtering module according to an embodiment of the present application;
Fig. 2 is a flow chart of a compensation method for broadband signals according to an embodiment of the present application;
FIG. 3 is a flow chart illustrating another method for compensating a wideband signal according to an embodiment of the present application;
FIG. 4 is a flow chart of another method for compensating a wideband signal according to an embodiment of the present application;
FIG. 5 is a flow chart of another method for compensating a wideband signal according to an embodiment of the present application;
FIG. 6 is a flowchart of a lookup table generation process according to an embodiment of the present application;
FIG. 7 is a schematic diagram of an original wideband signal and a processed wideband signal according to an embodiment of the present application;
Fig. 8 is a schematic diagram of power of a subcarrier signal according to an embodiment of the present application;
fig. 9 is a schematic diagram of status values of a subcarrier signal according to an embodiment of the present application;
FIG. 10 is a schematic diagram of a compensated wideband signal according to an embodiment of the present application;
FIG. 11 is a schematic diagram of another compensated wideband signal provided by an embodiment of the present application;
FIG. 12 is a schematic structural diagram of a compensation device according to an embodiment of the present application;
Fig. 13 is a schematic structural diagram of a status value generating module according to an embodiment of the present application;
FIG. 14 is a schematic diagram of a combined compensation module and combining module according to an embodiment of the present application;
fig. 15 is a schematic structural diagram of an electronic device according to an embodiment of the present application.
Detailed Description
The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
It should be noted that all directional indicators (such as up, down, left, right, front, and rear … …) in the embodiments of the present invention are merely used to explain the relative positional relationship, movement, etc. between the components in a particular posture (as shown in the drawings), and if the particular posture is changed, the directional indicator is changed accordingly.
The terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present application, unless otherwise indicated, the meaning of "a plurality" is two or more.
In the description of the present application, it should be noted that, unless explicitly stated and limited otherwise, the terms "connected," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected. The specific meaning of the above terms in the present application will be understood in specific cases by those of ordinary skill in the art. In addition, when describing a pipeline, the terms "connected" and "connected" as used herein have the meaning of conducting. The specific meaning is to be understood in conjunction with the context.
In embodiments of the application, words such as "exemplary" or "such as" are used to mean serving as an example, instance, or illustration. Any embodiment or design described herein as "exemplary" or "e.g." in an embodiment should not be taken as preferred or advantageous over other embodiments or designs. Rather, the use of words such as "exemplary" or "such as" is intended to present related concepts in a concrete fashion.
In order to cope with the future explosive mobile data flow increase, the equipment connection of mass mobile communication and various new services and application scenes which are continuously emerging, a 5G communication protocol is generated. However, the long-time memory effect of the GaN power amplifier can affect the signal demodulation under the 5G communication protocol, so as to deteriorate the downlink data transmission, and under the 5G communication protocol, the scenario that the power and the signal bandwidth are changed drastically can occur at the same time. The existing compensation method for the long-time memory effect of the GaN power amplifier has a certain compensation effect on the scene of the long-time memory effect excited by the power mutation, but cannot be applied to the scene of severe change of the signal bandwidth.
Based on this, the embodiment of the application provides a compensation method for a wideband signal, after obtaining a wideband signal, each subcarrier signal is compensated by each subcarrier signal and power and state value included in the wideband signal, and then a plurality of compensated subcarrier signals are combined to obtain a compensated wideband signal, so that the compensated wideband signal can be suitable for a scene where signal bandwidth changes severely.
In order to facilitate understanding of the technical solution of the present application, the following description will be given for the terms related to the present application.
A power amplifier: the term "power amplifier" refers to an amplifier that can produce maximum power output to drive a load (e.g., a speaker) at a given distortion rate.
Baseband signal: the original electric signal which is sent by the information source (also called a sending end) and is not modulated (frequency spectrum shifting and transforming) is characterized by lower frequency, and the signal frequency spectrum starts from the vicinity of zero frequency and has a low-pass form. The baseband signal may be divided into a digital baseband signal and an analog baseband signal (and accordingly, the source is also divided into a digital source and an analog source) depending on the characteristics of the original electrical signal. In popular terms, the baseband signal is represented by two different voltages directly used as digital signal 1 or 0, and then sent to the line for transmission.
Broadband signal: the wideband signal is a frequency division multiplexing analog signal formed by modulating the baseband signal.
Active antenna unit (ACTIVE ANTENNA unit, AAU) is the main device of the 5G base station, and is structurally a remote radio unit (remote radio unit, RRU) +antenna unit (AU) integrated with the 4G era. A plurality of radio frequency transceiver units are integrated in the AAU.
A remote radio unit: the RRU separates the baseband unit and the radio frequency unit of the base station, and transmits baseband signals between the baseband unit and the radio frequency unit by light or Internet, so that the signal to noise ratio can reach the optimal state.
The RRU can comprise 4 modules, namely a digital intermediate frequency module, a transceiver module, a power amplifier module and a filtering module. The digital intermediate frequency module is used for modulation and demodulation, digital up-down conversion, A/D conversion and the like of optical transmission; the transceiver module is used for completing the conversion from the intermediate frequency signal to the radio frequency signal; and then the radio frequency signals are transmitted out through the antenna port by the power amplification module and the filtering module.
In some embodiments, the filtering module described above may be referred to as a frequency decomposition module. The filtering module may be comprised of multiple sets of finite length unit impulse response (finite impulse response, FIR) filters. The filtering module may be constructed in a variety of ways, for example, it may be constructed directly in accordance with a low-pass filter design or a combination of low-pass and high-pass filters. Fig. 1 is a schematic diagram illustrating a filter module according to an exemplary embodiment of the present application. As shown in fig. 1, the filtering module includes a plurality of FIR filters, and N is a positive integer.
Frequency point: a frequency band (band) is a segment of frequency, is a range, and a frequency point is a frequency point on the frequency band.
And (3) a base station: the base station is used for providing wireless access service for the terminal equipment. Specifically, each base station provides a service coverage area (also referred to as a cell). Terminal devices entering the area can communicate with the base station via wireless signals to thereby receive wireless access services provided by the base station. There may be overlap between the service coverage areas of the base stations and terminal devices within the overlap area may receive wireless signals from multiple base stations.
In some embodiments, the base station may be any of an evolved node b (eNB), a next generation node b (gNB), a transceiving point (transmission receive point, TRP), a transmission point (transmission point, TP), and some other access node. Base stations can be further classified into Macro base stations for providing Macro cells (Macro cells), micro base stations for providing micro cells (Pico cells), and Femto base stations for providing Femto cells (Femto cells), according to the size of the service coverage area provided. As wireless communication technology continues to evolve, future base stations may also be referred to by other names.
The foregoing is a description of some concepts related to the embodiments of the present application, and is not repeated herein.
Next, as shown in fig. 2, a flowchart of a method for compensating a wideband signal according to an exemplary embodiment of the present application is shown, where the method is applied to a compensating device, and the compensating device may be the base station, for example, the AAU or the RRU, and the method includes the following steps:
s101, decomposing the broadband signal into a plurality of subcarrier signals.
In some embodiments, after the compensation device obtains a wideband signal, in order to extract each frequency point of the wideband signal, the compensation device may decompose the wideband signal into a plurality of subcarrier signals based on the frequency point by using the frequency decomposition module.
It can be understood that one frequency point is one frequency point on the frequency band, and one frequency point corresponds to one subcarrier signal, so that the wideband signal can be decomposed into a plurality of subcarrier signals based on the frequency point.
If the wideband signal is a multi-carrier signal, the frequency decomposition module may be in the form of a combination filter that combines a low-pass filter and a high-pass filter. It can be appreciated that the effect of frequency domain decomposition by combining filters is better.
S102, acquiring power and state values of each subcarrier signal in the plurality of subcarrier signals.
In some embodiments, after the compensation means breaks down the wideband signal into a plurality of subcarrier signals, the power of each subcarrier signal may be obtained. The compensation device can then obtain the state value of each subcarrier signal according to the power of each subcarrier signal. The state value of one subcarrier signal is used for representing the long-time memory effect state of the frequency point where the subcarrier signal is located. For a description of how to obtain the state values of the respective subcarrier signals according to the power of the respective subcarrier signals, reference may be made to the following description of step S1022, which is not repeated herein.
And S103, compensating the plurality of subcarrier signals based on the power and state values of each subcarrier signal in the plurality of subcarrier signals to obtain a plurality of compensated subcarrier signals.
Alternatively, as shown in fig. 3, step S103 may be specifically implemented as the following steps:
s1031, determining an index address according to the power and state value of each of the plurality of subcarrier signals.
In some embodiments, for a frequency point where each subcarrier signal in the plurality of subcarrier signals is located, a lookup table corresponding to the frequency point where each subcarrier signal is located is stored in the compensation device in advance, and one lookup table includes a correspondence between a plurality of compensation values and a plurality of index addresses. The compensation values corresponding to the same index address in the lookup tables corresponding to different frequency points may be different.
It will be appreciated that the wideband signal comprises a plurality of sub-carrier signals, and that in compensating any one of the plurality of sub-carrier signals, equalization is required to take into account the effect on the other sub-carrier signals when compensating that sub-carrier signal. Based on this, in determining the index address, it is necessary to determine the index address in combination with the power and state value of each of the plurality of subcarrier signals.
It should be understood that the look-up table corresponding to the frequency point where each subcarrier signal is located is a multidimensional look-up table.
Specifically, step S1031 may be specifically implemented as the following steps:
a1, determining a first index value according to the power of each subcarrier signal in the plurality of subcarrier signals.
In some embodiments, the first index value is equal to a weighted sum of powers of individual ones of the plurality of subcarrier signals.
For example, the relationship between the power of each subcarrier signal in the plurality of subcarrier signals and the first index value may be as shown in the following formula (1):
Wherein IndxA is a first index value, N is the number of the plurality of subcarrier signals, a i is a preset power weight of an ith subcarrier signal in the N subcarrier signals, and a i is the power of the ith subcarrier signal in the N subcarrier signals. The preset power weight for each subcarrier signal may be preset by a network manager.
In some embodiments, the first index value may be determined based on the power and bit width of each of the plurality of subcarrier signals.
Illustratively, the relationship between the power and bit width of each of the plurality of subcarrier signals and the first index value may be as shown in the following equation (2):
Wherein B k is the bit width of the kth subcarrier signal in the N subcarrier signals.
A2, determining a second index value according to the state value of each subcarrier signal in the plurality of subcarrier signals.
In some embodiments, the second index value is equal to a weighted sum of the status values of the respective carrier signals of the plurality of subcarrier signals.
For example, the relationship between the state value of each subcarrier signal in the plurality of subcarrier signals and the second index value may be as shown in the following formula (3):
Wherein IndxS is a second index value, S i is a preset power weight of an ith subcarrier signal in the N subcarrier signals, and S i is a state value of the ith subcarrier signal in the N subcarrier signals. The preset state value weight of each subcarrier signal may be preset by a network manager.
A3, generating an index address based on the first index value and the second index value.
For example, the index address generated based on the first index value and the second index value may be (IndxA, indxS).
S1032, determining a compensation value corresponding to each of the plurality of subcarrier signals based on the index address.
Specifically, for each subcarrier signal in the plurality of subcarrier signals, the compensation value corresponding to the subcarrier signal may be found from a lookup table of the frequency point where the subcarrier signal is located based on the index address.
In this way, the above processing is performed for each of the plurality of subcarrier signals, and the compensation value corresponding to each subcarrier signal can be obtained.
Optionally, the compensation value corresponding to each subcarrier signal may be preset by a network manager based on experience, or may be obtained after training based on a machine learning algorithm, which is not limited in the embodiment of the present application.
S1033, for each subcarrier signal in the plurality of subcarrier signals, compensating the subcarrier signal with a compensation value corresponding to the subcarrier signal to obtain a compensated subcarrier signal.
In some embodiments, after the compensation value of one subcarrier signal is obtained for each subcarrier signal in each subcarrier signal, the subcarrier signal may be compensated based on the compensation value of the subcarrier signal to obtain a subcarrier signal after the subcarrier signal is compensated.
Specifically, the power of the subcarrier signal may be multiplied by the compensation value of the subcarrier signal to obtain a subcarrier signal compensated by the subcarrier signal.
And S104, combining the plurality of compensated subcarrier signals to obtain a compensated broadband signal.
As is clear from the above step S101, a plurality of subcarrier signals are obtained by decomposing a wideband signal. In some embodiments, after obtaining the plurality of compensated subcarrier signals, the plurality of compensated subcarrier signals may be combined to obtain the compensated wideband signal.
For example, a plurality of compensated subcarrier signals may be accumulated to obtain a compensated wideband signal.
Based on the embodiment shown in fig. 2, at least the following advantages are brought about: after a wideband signal is obtained, the wideband signal is decomposed, so that the power and state values of each subcarrier signal included in the wideband signal are compensated for each subcarrier signal. The state value of one subcarrier signal is used for representing the long-time memory effect state of the frequency point of the subcarrier signal, and the long-time memory effect state of the GaN power amplifier is excited by the long-time memory effect state of the frequency point, so that the influence of the long-time memory effect of the GaN power amplifier on broadband signal transmission can be reduced by compensating each subcarrier signal according to the power and state value of each subcarrier signal, the situation that the bandwidth of the compensated broadband signal is changed drastically under the 5G communication protocol can be met, and the power of one subcarrier signal is introduced in the process of compensating one subcarrier signal, namely the situation that the power and the bandwidth of the compensated broadband signal are changed drastically simultaneously under the 5G communication protocol can be met.
In some embodiments, as shown in fig. 4, the step S102 may be implemented as the following steps:
s1021, power of each subcarrier signal in the plurality of subcarrier signals is acquired.
In some embodiments, when the compensation means breaks down the wideband signal into a plurality of subcarrier signals, the power of each of the plurality of subcarrier signals may be obtained.
S1022, for each of the plurality of subcarrier signals, determining a state value of the subcarrier signal based on the power of the subcarrier signal.
In some embodiments, the state value of one subcarrier signal may be derived based on the power of one subcarrier signal.
Alternatively, as shown in fig. 5, step S1022 may be implemented as the following steps:
S10221, carrying out modular value calculation on the power of the subcarrier signal to obtain an initial state value of the subcarrier signal.
It will be appreciated that the power modulus of the subcarrier signal is calculated, i.e. the absolute value of the power of the subcarrier signal is taken as the initial state value of the subcarrier signal.
S10222, when the initial state value of the subcarrier signal is greater than or equal to the state value threshold, taking the difference value between the initial state value of the subcarrier signal and the first preset state value as the state value of the subcarrier signal.
In some embodiments, after the initial state value of a subcarrier signal is obtained, the initial state value of the subcarrier signal may be compared to a state value threshold. If the initial state value of the subcarrier signal is greater than or equal to the state value threshold, it means that the initial state value of the subcarrier signal is higher, and the weakening process needs to be performed on the initial state value of the subcarrier signal.
Specifically, the initial state value of the subcarrier signal may be subtracted from the first preset state value, and then a difference between the initial state value of the subcarrier signal and the first preset state value may be used as the state value of the subcarrier signal.
It should be noted that the state value threshold may be preset by a network manager, and the state value of the subcarrier signal determined at this time may be used as the state value threshold of the subcarrier signal of the frequency point where the subcarrier signal is located when compensation is performed next time.
S10223, taking the sum of the initial state value of the subcarrier signal and the second preset state value as the state value of the subcarrier signal under the condition that the initial state value of the subcarrier signal is smaller than the state value threshold.
It can be appreciated that if the initial state value of the subcarrier signal is smaller than the state value threshold, it means that the initial state value of the subcarrier signal is smaller, and enhancement processing needs to be performed on the initial state value of the subcarrier signal.
Specifically, the initial state value of the subcarrier signal and the second preset state value may be added, and then the sum between the initial state value of the subcarrier signal and the second preset state value is used as the state value of the subcarrier signal.
By way of example, both of the above cases may be represented by the following formula (4):
Wherein a k+1 is a state value of a kth subcarrier signal in the plurality of subcarrier signals, a k is an initial state value of the kth subcarrier signal in the plurality of subcarrier signals, Δ discharge is the first preset state value, P k+1 is the state value threshold, and Δ charge is the second preset state value.
Optionally, the first preset state value and the second preset state value may be preset by a network manager based on experience, or may be obtained by searching for a preset corresponding relationship by the compensation device.
Specifically, the compensation device stores a first corresponding relation and a second corresponding relation in advance, the first corresponding relation includes a corresponding relation between a plurality of state value difference values and a plurality of first preset state values, and the second corresponding relation includes a corresponding relation between a plurality of state value difference values and a plurality of second preset state values.
Optionally, when the initial state value of a subcarrier signal is greater than or equal to the state value threshold, the compensation device may traverse the first correspondence with a state value difference between the initial state value of the subcarrier signal and the state value threshold as an index, and find a first preset state value corresponding to the state value difference between the initial state value of the subcarrier signal and the state value threshold from the first correspondence. And then after searching for a first preset state value corresponding to the state value difference between the initial state value and the state value threshold of the subcarrier signal, taking the difference between the initial state value and the first preset state value of the subcarrier signal as the state value of the subcarrier signal.
Similarly, when the initial state value of a subcarrier signal is smaller than the state value threshold, the compensation device may traverse the second correspondence with a state value difference between the initial state value and the state value threshold of the subcarrier signal as an index, and find a second preset state value corresponding to the state value difference between the initial state value and the state value threshold of the subcarrier signal from the second correspondence. And then after searching for a second preset state value corresponding to the state value difference between the initial state value and the state value threshold of the subcarrier signal, taking the sum of the initial state value and the second preset state value of the subcarrier signal as the state value of the subcarrier signal.
Thus, the initial state value of a subcarrier signal is weakened or enhanced to obtain a subcarrier signal supplemented by the subcarrier signal, so that the long-time memory effect state of the frequency point of the subcarrier signal is simulated.
The foregoing embodiments focus on the compensation process for a wideband signal, and in some embodiments, the compensation method for a wideband signal provided by the embodiments of the present application further relates to a generation process of a lookup table corresponding to each frequency point, as shown in fig. 6, where the generation process includes the following steps:
S201, initializing parameters of the compensation device.
The parameter initialization of the compensation device mainly determines the initial parameters of the compensation device according to the initial state of the power amplifier. Wherein the following parameters need to be determined:
A. the wideband signal is frequency-partitioned into frequency bins.
B. And each frequency point performs frequency blocking of the filter coefficients.
C. charging and discharging meters when calculating the state value of the subcarrier signal of each frequency point.
D. and (5) configuring the route between the frequency points.
S202, configuring an index combination mode.
The configuration index combination mainly determines the index combination of IndxA and IndxS described above. The index combining approach needs to be combined with the following parameter training to feel the degree of replication of the overall wideband modeling scheme. It will be appreciated that a simple index combination may reduce modeling complexity but affect the final compensation effect; complex index combinations increase the complexity of modeling, but can achieve better compensation.
S203, training data acquisition.
The training data acquisition is to provide training samples for subsequent multi-dimensional look-up table parameter extraction. The acquisition of training samples generally has two ways: dynamic service acquisition and active initiation of training sequence acquisition. The dynamic service acquisition value is used for acquiring training data by collecting actual data of a dynamic service scene and effectively screening and reserving the actual data. The active initiation training sequence can generate training data capable of traversing each index dimension, and data collection and parameter extraction are performed under the condition that the data quality of the training data is ensured. The active initiation of training data sequences is more reasonable in terms of data validity.
S204, extracting parameters of the multidimensional lookup table.
The multi-dimensional lookup table is a multi-dimensional lookup table corresponding to the frequency point where each subcarrier signal is located described in the step S1031.
The parameter extraction of the multi-dimensional lookup table mainly comprises two steps, namely the coefficient extraction of the multi-dimensional parameters and the generation of the multi-dimensional lookup table.
Coefficient extraction is mainly carried out by adopting a least square mode in coefficient generation of multidimensional parameters, namely the following formula (5) is constructed:
Wherein n and m are constants, p ij is used to represent the state value threshold of the ij-th time, X is the input of all independent variables, i.e. the input of all subcarrier signals, Z is the output of all independent variables, i.e. the output of all subcarrier signals, and p and q are coefficients of the multidimensional lookup table.
Using least squares solution to orderR= [ a 1,A2,…,An,S1,S2,…,Sn ], the coefficient [ p, q ] = (R HR)-1(RH Z) can be obtained.
Where H is used to represent the conjugate transpose.
The construction of the multi-dimensional lookup table is carried out by calculating corresponding table values through index values on the basis of multi-dimensional indexes.
S205, relevant parameters are input into the compensation device.
After the related parameters are obtained, the related parameters are input into the compensation device to realize the radio frequency performance correction of the scene with severe change of the signal bandwidth.
A method for compensating a wideband signal according to an embodiment of the present application will be illustrated with reference to a specific example.
By way of example, taking a GaN power amplifier with a maximum bandwidth of 320 megabits (Mbps, M) for the wideband, the original wideband signal and the wideband signal after Digital Predistortion (DPD) processing are shown in fig. 7.
As can be seen from fig. 7, the wideband signal of the GaN power amplifier after DPD correction has a larger distortion in the right frequency band under normal conditions. Wherein the smoother curve shown in fig. 7 represents the original wideband signal and the more curved curve represents the wideband signal after DPD correction.
Further, the compensation device performs double-frequency division on the original wideband signal through the spectrum by using the combined filter, and takes the original wideband signal decomposed into two subcarrier signals as an example for explanation, and the output effect of the combined filter is shown in fig. 8. In fig. 8, S is the power of the original wideband signal, S1 is the power of the first subcarrier signal after the original wideband signal is decomposed by the combining filter, and S2 is the power of the second subcarrier signal after the original wideband signal is decomposed by the combining filter.
Further, the compensation means determines the state value A1 of the first subcarrier signal and the state value A2 of the second subcarrier signal based on the power S1 of the first subcarrier signal and the power S2 of the second subcarrier signal. The determined state value A1 of the first subcarrier signal and the determined state value A2 of the second subcarrier signal may be as shown in fig. 9.
After the compensation means determines the state value A1 of the first subcarrier signal and the state value A2 of the second subcarrier signal, the compensation means may determine the first index value based on the power S1 of the first subcarrier signal and the power S2 of the second subcarrier signal. The second index value is determined based on the state value A1 of the first subcarrier signal and the state value A2 of the second subcarrier signal. And generating an index address according to the first index value and the second index value. And then inputting the index address into a lookup table of the frequency point of the first subcarrier signal to find the compensation value C1 corresponding to the first subcarrier signal. And inputting the index address into a lookup table of the frequency point of the second subcarrier signal to find a compensation value C2 corresponding to the second subcarrier signal.
After the compensation value C1 corresponding to the first subcarrier signal and the compensation value C2 corresponding to the second subcarrier signal are obtained, the first subcarrier signal may be compensated based on the compensation value C1 corresponding to the first subcarrier signal, so as to obtain a compensated first subcarrier signal. And compensating the second subcarrier signal based on the compensation value C2 corresponding to the second subcarrier signal to obtain a compensated second subcarrier signal.
Specifically, the compensation value C1 corresponding to the first subcarrier signal is multiplied by the power S1 of the first subcarrier signal, so as to obtain a compensated first carrier signal. And multiplying the compensation value C2 corresponding to the second subcarrier signal with the power S2 of the second subcarrier signal to obtain a compensated second subcarrier signal.
Further, the compensated first carrier signal and the compensated second subcarrier signal are added to obtain a compensated wideband signal.
As shown in fig. 10, the radio frequency AM-AM characteristic of the compensated wideband signal is significantly improved on the DPD basis.
As shown in fig. 11, the radio frequency AM-PM characteristic of the compensated wideband signal is significantly improved on the DPD basis.
The foregoing description of the solution provided by the embodiments of the present application has been mainly presented in terms of a method. To achieve the above functions, it includes corresponding hardware structures and/or software modules that perform the respective functions. Those of skill in the art will readily appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as hardware or combinations of hardware and computer software. Whether a function is implemented as hardware or computer software driven hardware depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.
Fig. 12 is a schematic structural diagram of a compensation device according to an embodiment of the present application, where the compensation device is configured to perform the above-described method for compensating a wideband signal, and the compensation device 2000 includes a frequency decomposition module 2001, a signal compensation module 2002, and a combining module 2003.
As shown in fig. 12, the frequency decomposition module 2001 may include a plurality of FIR filters (for example, FIR1, FIR2, and FIRN) for decomposing one wideband signal into a plurality of subcarrier signals.
In some embodiments, the signal compensation module 2002 includes a plurality of state value generation modules (e.g., state value generation module 1, state value generation module 2, and state value generation module N), a routing module, a plurality of look-up table modules (e.g., look-up table module 1, look-up table module 2, and look-up table module N), and a combined compensation module.
Wherein, for each state value generation module of the plurality of state value generation modules, one state value generation module is used for generating the state value of one subcarrier signal based on the power of the subcarrier signal.
Fig. 13 is a schematic structural diagram of a state value generating module according to an embodiment of the present application. Taking the state value generation module 1 as an example, the state value generation module 1 may comprise a plurality of sub-modules, for example, the state value generation module 1 may comprise an initial state value generation module, a comparison module, an enhancement module, a weakening module and a multiplexer MUX.
The initial state value generating module is used for performing modular value calculation on the power S1 of one subcarrier signal to obtain an initial state value of the subcarrier signal.
The comparison module is used for comparing the initial state value of a subcarrier signal with a state value threshold, inputting the initial state value of the subcarrier signal to the weakening module when the initial state value of the subcarrier signal is larger than or equal to the state value threshold, and inputting the initial state value of the subcarrier signal to the enhancement module when the initial state value of the subcarrier signal is smaller than the state value threshold.
The enhancement module is used for adding the initial state value and the second preset state value of the subcarrier signal, further taking the sum of the initial state value and the second preset state value of the subcarrier signal as the state value of the subcarrier signal, and outputting the state value of the subcarrier signal.
The weakening module is used for subtracting the initial state value of the subcarrier signal from the first preset state value, further taking the difference value between the initial state value of the subcarrier signal and the first preset state value as the state value of the subcarrier signal, and outputting the state value of the subcarrier signal to the routing module.
The multiplexer MUX is configured to ensure that the state value generating module of a certain frequency branch only performs enhancement processing or attenuation processing at the same time, and output the state value A1 of the subcarrier signal of the frequency branch.
In some embodiments, the routing module is configured to generate an index address according to the power and the state value of each subcarrier signal, and further output the index address to a lookup table module corresponding to the frequency point where each subcarrier signal is located.
In some embodiments, for each of the plurality of lookup table modules, one lookup table module is configured to determine, after receiving the index address sent by the routing module, a compensation value of a subcarrier signal corresponding to the frequency point according to the index address, and further output, to the combined compensation module, the compensation value of the subcarrier signal corresponding to the frequency point of the lookup table module.
In some embodiments, the combined compensation module is configured to compensate each subcarrier signal based on the compensation value of each subcarrier signal after receiving the compensation value of each subcarrier signal transmitted by each look-up table module.
Specifically, as shown in fig. 14, the combination compensation module multiplies the power Sn of each subcarrier signal by the compensation value Cn to obtain each compensated subcarrier signal, and then the combination compensation module outputs each compensated subcarrier signal to the combining module 2003.
After receiving each compensated subcarrier signal, the combining module 2003 is configured to combine each compensated subcarrier signal to obtain a compensated wideband signal.
Specifically, the above-described fig. 14 is continued. The combining module 2003 is configured to accumulate each compensated subcarrier signal to obtain a compensated wideband signal Y, and further output the compensated wideband signal Y.
In this way, the compensation device 2000 performs compensation for a wideband signal.
In some embodiments, in a practical application scenario, the compensating device 2000 may be designed before the digital-to-analog converter of the base station and after the digital predistortion module in the digital intermediate frequency link.
The individual modules in fig. 12, if implemented in the form of software functional modules and sold or used as separate products, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the embodiments of the present application may be essentially or a part contributing to the prior art or all or part of the technical solution may be embodied in the form of a software product stored in a storage medium, including several instructions to cause a computer device (which may be a personal computer, a server, or a network device, etc.) or a processor (processor) to perform all or part of the steps of the method described in the embodiments of the present application. The storage medium storing the computer software product includes: a U-disk, a removable hard disk, a read-only memory (ROM), a random access memory (random access memory, RAM), a magnetic disk, or an optical disk, or other various media capable of storing program codes.
In the case of implementing the functions of the integrated modules in the form of hardware, the embodiment of the application provides a schematic structural diagram of an electronic device, which may be the compensation device. As shown in fig. 15, the electronic apparatus 3000 includes: a processor 3002, a communication interface 3003, and a bus 3004. Optionally, the electronic device may also include memory 3001.
The processor 3002, which may be a logic block, module, and circuit implementing or executing the various examples described in connection with the present disclosure. The processor 3002 may be a central processor, general purpose processor, digital signal processor, application specific integrated circuit, field programmable gate array or other programmable logic device, transistor logic device, hardware components, or any combination thereof. Which may implement or perform the various exemplary logic blocks, modules and circuits described in connection with this disclosure. The processor 3002 may also be a combination that implements computing functionality, such as a combination comprising one or more microprocessors, a combination of a DSP and a microprocessor, or the like.
Communication interface 3003 for connection with other devices through a communication network. The communication network may be an ethernet, a radio access network, a wireless local area network (wireless local area networks, WLAN), etc.
The memory 3001 may be, but is not limited to, a read-only memory (ROM) or other type of static storage device that can store static information and instructions, a random access memory (random access memory, RAM) or other type of dynamic storage device that can store information and instructions, or an electrically erasable programmable read-only memory (ELECTRICALLY ERASABLE PROGRAMMABLE READ-only memory, EEPROM), magnetic disk storage or other magnetic storage device, or any other medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer.
As a possible implementation, the memory 3001 may exist separately from the processor 3002, the memory 3001 may be connected to the processor 3002 by a bus 3004 for storing instructions or program code. The processor 3002, when calling and executing instructions or program code stored in the memory 3001, is capable of implementing the wideband signal compensation method provided by the embodiments of the present application.
In another possible implementation, the memory 3001 may also be integrated with the processor 3002.
Bus 3004 may be an extended industry standard architecture (extended industry standard architecture, EISA) bus or the like. The bus 3004 may be classified into an address bus, a data bus, a control bus, and the like. For ease of illustration, only one thick line is shown in fig. 15, but not only one bus or one type of bus.
It will be apparent to those skilled in the art from this description that, for convenience and brevity of description, only the above-described division of the functional modules is illustrated, and in practical application, the above-described functional allocation may be implemented by different functional modules according to needs, i.e. the internal structure of the compensation device is divided into different functional modules to implement all or part of the functions described above.
The embodiment of the application also provides a computer readable storage medium. All or part of the flow in the above method embodiments may be implemented by computer instructions to instruct related hardware, and the program may be stored in the above computer readable storage medium, and the program may include the flow in the above method embodiments when executed. The computer readable storage medium may be any of the foregoing embodiments or memory. The computer-readable storage medium may be an external storage device of the compensation device, such as a plug-in hard disk, a smart card (SMART MEDIA CARD, SMC), a Secure Digital (SD) card, or a flash memory card (FLASH CARD) provided in the compensation device. Further, the computer readable storage medium may further include both an internal storage unit and an external storage device of the compensation apparatus. The computer readable storage medium is used for storing the computer program and other programs and data required by the compensation device. The above-described computer-readable storage medium may also be used to temporarily store data that has been output or is to be output.
Embodiments of the present application also provide a computer program product comprising a computer program which, when run on a computer, causes the computer to perform the method of compensating for a wideband signal as provided in any of the above embodiments.
Although the application is described herein in connection with various embodiments, other variations to the disclosed embodiments can be understood and effected by those skilled in the art in practicing the claimed application, from a study of the drawings, the disclosure, and the appended claims. In the claims, the term "comprising" (Comprising) does not exclude other elements or steps, and "a" or "an" does not exclude a plurality. A single processor or other unit may fulfill the functions of several items recited in the claims. The mere fact that certain measures are recited in mutually different dependent claims does not indicate that a combination of these measures cannot be used to advantage.
Although the application has been described in connection with specific features and embodiments thereof, it will be apparent that various modifications and combinations can be made without departing from the spirit and scope of the application. Accordingly, the specification and drawings are merely exemplary illustrations of the present application as defined in the appended claims and are considered to cover any and all modifications, variations, combinations, or equivalents that fall within the scope of the application. It will be apparent to those skilled in the art that various modifications and variations can be made to the present application without departing from the spirit or scope of the application. Thus, it is intended that the present application also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.
The present application is not limited to the above embodiments, and any changes or substitutions within the technical scope of the present application should be covered by the scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.
Claims (10)
1. A method of compensating for a wideband signal, the method comprising:
decomposing the wideband signal into a plurality of subcarrier signals;
Acquiring power and state values of each subcarrier signal in the plurality of subcarrier signals, wherein the state values of the subcarrier signals are used for representing long-time memory effect states of frequency points of the subcarrier signals;
Compensating the plurality of subcarrier signals based on the power and state values of each subcarrier signal in the plurality of subcarrier signals to obtain a plurality of compensated subcarrier signals;
and combining the plurality of compensated subcarrier signals to obtain a compensated width signal.
2. The method of claim 1, wherein compensating the plurality of subcarrier signals based on the power and state values of each of the plurality of subcarrier signals results in a plurality of compensated subcarrier signals, comprising:
determining an index address according to the power and state values of each subcarrier signal in the plurality of subcarrier signals;
Determining a compensation value corresponding to each subcarrier signal in the plurality of subcarrier signals based on the index address;
And for each subcarrier signal in the plurality of subcarrier signals, compensating the subcarrier signal by using a compensation value corresponding to the subcarrier signal to obtain a compensated subcarrier signal.
3. The method of claim 2, wherein determining the index address based on the power and state values of each of the plurality of subcarrier signals comprises:
Determining a first index value according to the power of each subcarrier signal in the plurality of subcarrier signals;
determining a second index value according to the state value of each subcarrier signal in the plurality of subcarrier signals;
The index address is generated based on the first index value and the second index value.
4. The method of claim 3, wherein the first index value is equal to a weighted sum of power of each of the plurality of subcarrier signals and the second index value is equal to a weighted sum of state values of each of the plurality of subcarrier signals.
5. The method of claim 2, wherein determining the compensation value for each of the plurality of subcarrier signals based on the index address comprises:
And for each subcarrier signal in the plurality of subcarrier signals, based on the index address, searching a compensation value corresponding to the subcarrier signal from a lookup table corresponding to a frequency point where the subcarrier signal is located.
6. The method according to any one of claims 1 to 5, wherein said obtaining the power and state values of each of the plurality of subcarrier signals comprises:
Acquiring power of each subcarrier signal in the plurality of subcarrier signals;
for each subcarrier signal of the plurality of subcarrier signals, a state value of the subcarrier signal is determined based on the power of the subcarrier signal.
7. The method of claim 6, wherein said determining a state value of said subcarrier signal based on a power of said subcarrier signal comprises:
Performing modular value calculation on the power of the subcarrier signal to obtain an initial state value of the subcarrier signal;
Taking the difference value between the initial state value of the subcarrier signal and a first preset state value as the state value of the subcarrier signal under the condition that the initial state value of the subcarrier signal is larger than or equal to a state value threshold; or alternatively
And taking the sum of the initial state value of the subcarrier signal and a second preset state value as the state value of the subcarrier signal under the condition that the initial state value of the subcarrier signal is smaller than the state value threshold.
8. A compensation device, comprising:
a frequency decomposition module for decomposing the wideband signal into a plurality of subcarrier signals;
the signal compensation module is used for acquiring the power and state value of each subcarrier signal in the plurality of subcarrier signals, and the state value of the subcarrier signal is used for representing the long-time memory effect state of the frequency point where the subcarrier signal is located;
the signal compensation module is further configured to compensate the plurality of subcarrier signals based on power and state values of each subcarrier signal in the plurality of subcarrier signals, to obtain a plurality of compensated subcarrier signals;
And the combining module is used for combining the plurality of compensated subcarrier signals to obtain a compensated width signal.
9. An electronic device, comprising: a processor and a memory for storing instructions executable by the processor;
Wherein the processor is configured to execute the instructions to cause the electronic device to perform the method of compensating for a wideband signal as claimed in any of claims 1-7.
10. A computer readable storage medium having stored thereon computer instructions which, when run on an electronic device, cause the electronic device to perform the method of compensating for a wideband signal as claimed in any of claims 1-7.
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