CN115529212A - Open-loop-based short-wave communication method, device, equipment and readable storage medium - Google Patents
Open-loop-based short-wave communication method, device, equipment and readable storage medium Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/38—Synchronous or start-stop systems, e.g. for Baudot code
- H04L25/40—Transmitting circuits; Receiving circuits
- H04L25/49—Transmitting circuits; Receiving circuits using code conversion at the transmitter; using predistortion; using insertion of idle bits for obtaining a desired frequency spectrum; using three or more amplitude levels ; Baseband coding techniques specific to data transmission systems
Abstract
When electronic equipment sends a first baseband signal, a predistortion coefficient is determined from a predistortion coefficient table according to environmental parameters of the current working environment, predistortion processing is carried out on the first baseband signal according to the predistortion coefficient to obtain a first distortion signal, and short wave communication is carried out according to the first distortion signal. By adopting the scheme, when the baseband signal is sent on line to the electronic equipment without the feedback loop and with the shortage of FPGA resources, the baseband signal is processed by utilizing the predistortion coefficient calculated off line, so that the purpose of compensating the nonlinear characteristic of the power amplifier of the electronic equipment and ensuring the efficiency of the power amplifier is realized.
Description
Technical Field
The application relates to the technical field of short-wave communication, in particular to a short-wave communication method, a short-wave communication device, short-wave communication equipment and a readable storage medium based on open loop.
Background
Short wave communication mainly depends on sky wave transmission, has the characteristics of long transmission distance and no need of relay in transmission, and is an important means of modern communication.
Currently, there are many losses in short-wave communication, which impair the received power of the signal. In order to increase the transmission distance of short-wave communication, the transmission power of the transmitting-end device needs to be increased. The power amplifier at the transmitting end is a typical non-linear system. When the transmission power of the transmitting end equipment is close to a saturation state, the output presents nonlinear characteristics, so that nonlinear effects such as spurious and intermodulation distortion are generated, the error rate of a communication system is increased, and adjacent channels are interfered. Therefore, the requirement of the linearity of the power amplifier is very high for short-wave communication. In order to improve the linearity of the power amplifier, a power back-off method is generally used, in which the input power of the power amplifier is backed off by several dB from a 1 decibel (dB) compression point, so that the power amplifier operates in a region far from the 1dB compression point, thereby returning the power amplifier to a linear amplification region.
However, the power back-off method reduces the utilization efficiency of the power amplifier and increases heat dissipation.
Disclosure of Invention
The embodiment of the application discloses a short wave communication method, a short wave communication device, short wave communication equipment and a readable storage medium based on an open loop, wherein the efficiency of a power amplifier is ensured while the nonlinearity of the power amplifier is compensated by utilizing an open loop mechanism.
In a first aspect, an embodiment of the present application provides an open-loop-based short-wave communication method, which is applied to an electronic device, and the method includes:
determining environmental parameters of the current working environment of the electronic equipment;
determining a predistortion coefficient from a predistortion coefficient table according to the environment parameter, wherein the predistortion coefficient table stores the corresponding relation between the environment parameter and the predistortion coefficient under different working environments;
carrying out predistortion treatment on the first baseband signal according to the predistortion coefficient to obtain a first distortion signal;
and carrying out short-wave communication according to the first distortion signal.
In a second aspect, an embodiment of the present application provides an open-loop-based short-wave communication apparatus, including:
the first determining module is used for determining the environmental parameters of the current working environment of the electronic equipment;
the second determining module is used for determining a predistortion coefficient from a predistortion coefficient table according to the environment parameter, and the predistortion coefficient table stores the corresponding relation between the environment parameter and the predistortion coefficient under different working environments;
the processing module is used for carrying out predistortion processing on the first baseband signal according to the predistortion coefficient to obtain a first distortion signal;
and the communication module is used for carrying out short-wave communication according to the first distortion signal.
In a third aspect, an embodiment of the present application provides an electronic device, including: a processor, a memory and a computer program stored on the memory and executable on the processor, the processor when executing the computer program causing the electronic device to carry out the method according to the first aspect or the various possible implementations of the first aspect.
In a fourth aspect, embodiments of the present application provide a computer-readable storage medium, in which computer instructions are stored, and when executed by a processor, the computer instructions are configured to implement the method according to the first aspect or various possible implementation manners of the first aspect.
In a fifth aspect, embodiments of the present application provide a computer program product comprising a computer program, which when executed by a processor, implements the method according to the first aspect or the various possible implementations of the first aspect.
According to the short-wave communication method, the short-wave communication device, the short-wave communication equipment and the readable storage medium based on the open loop, when the electronic equipment sends the first baseband signal, the predistortion coefficient is determined from the predistortion coefficient table according to the environment parameters of the current working environment, the predistortion processing is carried out on the first baseband signal according to the predistortion coefficient to obtain the first distortion signal, and the short-wave communication is carried out according to the first distortion signal. By adopting the scheme, when the baseband signal is sent on line to the electronic equipment which does not have a feedback loop and has a shortage of FPGA resources, the baseband signal is processed by utilizing the predistortion coefficient calculated off-line, and the purpose of compensating the nonlinear characteristic of the power amplifier of the electronic equipment and ensuring the efficiency of the power amplifier is realized.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required to be used in the embodiments will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
Fig. 1A is a schematic AM-AM characteristic curve of a short wave power amplifier of an electronic device for performing a method provided by an embodiment of the present application;
fig. 1B is a schematic AM-PM characteristic of a short wave power amplifier of an electronic device for performing the method provided by the embodiments of the present application;
fig. 2 is a basic schematic diagram of an open-loop-based short-wave communication method provided by an embodiment of the present application;
fig. 3 is a process schematic diagram of an open-loop-based short-wave communication method provided by an embodiment of the present application;
fig. 4 is a flowchart of an open-loop-based short-wave communication method according to an embodiment of the present application;
fig. 5 is a schematic view of an environment parameter setting interface in the open-loop-based short-wave communication method provided in the embodiment of the present application;
FIG. 6 is an instrument architecture diagram for calculating predistortion coefficients based on an open-loop short-wave communication method according to an embodiment of the present application;
fig. 7 is a flowchart of an offline learning phase in the open-loop-based short-wave communication method according to the embodiment of the present application;
fig. 8 is a schematic structural diagram of an applicable predistortion model for an open-loop-based short-wave communication method provided in an embodiment of the present application;
fig. 9 is a schematic process diagram for online use in an open-loop-based short-wave communication method provided by an embodiment of the present application;
fig. 10 is an effect diagram of an open-loop-based short-wave communication method provided by an embodiment of the present application;
fig. 11 is a schematic structural diagram of an open-loop-based short-wave communication device according to an embodiment of the present application;
fig. 12 is a schematic structural diagram of an electronic device according to an embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present application without making any creative effort belong to the protection scope of the present application.
It is to be noted that the terms "comprises" and "comprising" and any variations thereof in the examples and figures of the present application are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements listed, but may alternatively include other steps or elements not listed, or inherent to such process, method, article, or apparatus.
At present, the requirements of electronic equipment based on short-wave communication on power consumption are strict. Low power consumption is a necessary trend in the development of electronic devices. In order to reduce the power consumption of the electronic device, it is necessary to improve the operating efficiency of the power amplifier, so that the transmitter of the electronic device has lower input power consumption under the premise of the same output power. The short-wave power amplifier (hereinafter referred to as power amplifier or power amplifier) is a core component of a short-wave transmitting link, and the performance of the power amplifier has a great influence on the overall effect, intermodulation distortion and other indexes of electronic equipment.
In order to improve the working efficiency of the power amplifier, the power amplifier of the transmitter is usually required to work in a state close to saturation. Although the output power of the electronic device can be increased under the condition of the same input power, when the power amplifier works at a point close to the saturation point, the nonlinear characteristic of the power amplifier is stronger, and the nonlinear distortion of the output signal of the power amplifier is larger. The nonlinear distortion of the signal not only can generate in-band distortion to influence the error rate of the signal, but also can generate out-of-band distortion to cause interference to adjacent frequency band channels.
Therefore, in short-wave communication, a very high requirement is put forward on the linearity of the power amplifier of the electronic equipment, and it is very important to improve the linearity of the power amplifier on the premise of keeping high efficiency as much as possible. The power amplifier linearization technique is called a key technique in short-wave communication systems.
In order to improve the linearity of the power amplifier, the conventional method is a power return method, i.e., the input power of the power amplifier is returned backwards by several dB from a 1dB compression point, so that the power amplifier works in an area far away from the 1dB compression point, and the power amplifier works in a linear amplification area.
However, the power back-off method reduces the utilization efficiency of the power amplifier and increases the heat dissipation, and this method of sacrificing the efficiency of the power amplifier in exchange for the linearity is obviously not desirable. Moreover, when the power is backed off to a certain degree, the linearity of the power amplifier cannot be changed. Therefore, the power back-off method is not suitable for short-wave communication systems with high requirements on linearity and efficiency of power amplifiers.
In addition, there are other power amplifier linearization techniques, such as Doherty power amplification, feedforward techniques, etc. In which, the Doherty power amplifier technology needs to add extra hardware overhead. The characteristic parameters of the circuit of the feedforward technology are influenced by aging of devices, temperature change and the like, the performance is unstable, the efficiency of the feedforward technology is low and is generally about 10%, and the design and debugging are complex.
Based on the above, the embodiments of the present application provide a short-wave communication method, apparatus, device and readable storage medium based on an open-loop based on a digital predistortion theory and a short-wave communication transmitting station, and ensure the efficiency of a power amplifier while compensating the nonlinearity of the power amplifier by using an open-loop mechanism.
The scheme is suitable for the scenes that the using scenes are complex and changeable and the power amplifier needs to be tracked and compensated. The scheme requires that a transmitter of the electronic equipment has a simple and stable use scene, a no-signal feedback loop and a scene with limited Field Programmable Gate Array (FPGA) resources, and can effectively realize the linear output of the power amplifier under the condition of limited available resources.
Fig. 1A is a schematic diagram of an AM-AM characteristic curve of a short-wave power amplifier of an electronic device for performing the method provided by the embodiments of the present application. Referring to fig. 1A, the abscissa represents input Amplitude Modulation (AM), and the ordinate represents output AM, where input AM and output AM are nonlinear.
Fig. 1B is a schematic diagram of an AM-PM characteristic curve of a short-wave power amplifier of an electronic device for performing the method provided by the embodiment of the present application. Referring to fig. 1A, the abscissa represents the input AM, the ordinate represents the output Phase Modulation (PM), and the input AM and the output PM are nonlinear.
The technical idea of the embodiment of the application is to construct a Digital pre-distortion (DPD) model which is inverse to the characteristics of the shortwave power amplifier, wherein the Digital pre-distortion model is also called as a DPD model, a predistortion model and the like. After the baseband signal is input into the predistortion model, the predistortion model changes the baseband signal into a distorted signal, and then the distorted signal is input into the short-wave power amplifier, so that the output signal of the short-wave power amplifier and the original baseband signal form a linear relation. The predistortion model may also be referred to as a predistorter.
Ideally, a cascade system formed by predistortion-power amplification presents linear characteristics. For example, please refer to fig. 2.
Fig. 2 is a basic schematic diagram of an open-loop-based short-wave communication method provided in an embodiment of the present application. Referring to FIG. 2, the upper left coordinate system represents the characteristic curve of the pre-distortion model, i.e., DPD model, the input (V) of the characteristic curve i ) And output (V) d ) Is non-linear. The upper right-hand coordinate system represents the characteristic curve of the Power Amplifier (PA), the input (v) of which d ) And output (V) 0 ) As well as non-linear.
The lowermost coordinate system represents the characteristic curve of the cascaded model of the predistortion model and PA. Input (V) of the characteristic curve i ) And output (V) 0 ) In a linear relationship.
Based on fig. 1A, fig. 1B and fig. 2, to solve the non-linearity problem of the power amplifier, under the basic theory based on predistortion, the embodiments of the present application aim to provide a short-wave communication method, apparatus, device and readable storage medium based on open loop. The short-wave communication device based on the open loop can be flexibly arranged in a short-wave digital channel unit of the electronic equipment, is convenient to install and is easy to realize. Moreover, by adopting the method of the embodiment of the application, after the predistortion treatment technology is adopted, the third-order intermodulation index (2 MHz-30 MHz) of the transmitter of the electronic equipment is improved from original-20 dB to more than-40 dB, and the frequency spectrum quality of the transmitter is also greatly improved.
Fig. 3 is a process schematic diagram of an open-loop-based short-wave communication method provided in an embodiment of the present application. Referring to fig. 3, the open-loop-based short-wave communication method provided in the embodiment of the present application includes an offline learning phase and an online using phase. The part above the dotted line is the off-line learning stage, and the part below the dotted line is the on-line use stage.
And in the off-line learning stage, the nonlinear characteristics of the power amplifier of the electronic equipment are learned to obtain the predistortion coefficients of the predistortion model under different environmental parameters, and the predistortion coefficients are written into the FPGA program. In the process, relevant software and the like on the electronic equipment can be used for generating a baseband test signal, the baseband test signal is downloaded to a vector signal source for up-conversion to obtain a radio frequency signal, and then the radio frequency signal is amplified by a transmitter power amplifier and then reaches a frequency spectrograph through an attenuator, and the frequency spectrograph can be used for obtaining a baseband signal corresponding to a power amplifier output signal. In the process, a baseband signal corresponding to the power amplifier output signal is sampled to learn the nonlinear characteristic of the power amplifier.
In an online use stage, a predistortion unit of the electronic equipment determines environmental parameters of a current working environment of the power amplifier, determines a predistortion coefficient according to the environmental parameters, performs predistortion processing on a current baseband signal according to the predistortion coefficient to obtain a first distorted signal, performs up-conversion on the first distorted signal to obtain a radio frequency signal, and then sends the radio frequency signal into a power amplifier of the electronic equipment, and the power amplifier amplifies the radio frequency signal and then outputs the radio frequency signal, so that the nonlinear characteristic of the power amplifier is supplemented, and meanwhile, short wave communication is realized. In this stage, after the predistortion coefficient is determined according to the environmental parameter, the predistortion coefficient is transmitted to the predistortion model. And carrying out predistortion processing on the first baseband signal by using a predistortion model to obtain a first distorted signal. Then, the first distortion signal is up-converted and the like, and then input to a power amplifier of the transmitter, amplified by the power amplifier, and output.
The short-wave communication method based on open-loop according to the embodiment of the present application will be described in detail below based on the descriptions of fig. 1 to fig. 3. For example, please refer to fig. 4.
Fig. 4 is a flowchart of an open-loop-based short-wave communication method according to an embodiment of the present application. The execution subject of the embodiment is an electronic device that performs communication using short waves, and the method includes the steps of:
401. and determining the environmental parameters of the current working environment of the electronic equipment.
For example, the electronic device measures the current working environment using a sensor or the like to determine an environmental parameter of the current working environment. The environmental parameters include the current working temperature, voltage, frequency point and the like of the electronic equipment.
402. And determining a predistortion coefficient from a predistortion coefficient table according to the environment parameter, wherein the predistortion coefficient table stores the corresponding relation between the environment parameter and the predistortion coefficient under different working environments.
Illustratively, a predistortion coefficient table is pre-stored in the electronic device, and the predistortion coefficient packet stores the corresponding relationship between the environmental parameters and the predistortion coefficients under different working environments. For example, the environment parameters include temperature 1, voltage 2, and frequency point 3, and the corresponding predistortion coefficient is predistortion coefficient 4.
403. And carrying out predistortion treatment on the first baseband signal according to the predistortion coefficient to obtain a first distortion signal.
Illustratively, after determining the predistortion coefficients, the electronic device takes the first baseband signal and the first baseband signal as inputs of the predistortion model, so that the predistortion model outputs the first distorted signal.
404. And carrying out short-wave communication according to the first distortion signal.
After the electronic device obtains the first distortion signal, the first distortion signal is subjected to up-conversion, digital-to-analog conversion, power amplification, harmonic filtering and the like and is output.
According to the short-wave communication method based on the open loop, when the electronic equipment sends the first baseband signal, the predistortion coefficient is determined from the predistortion coefficient table according to the environment parameters of the current working environment, the predistortion processing is carried out on the first baseband signal according to the predistortion coefficient to obtain the first distortion signal, and the short-wave communication is carried out according to the first distortion signal. By adopting the scheme, when the baseband signal is sent on line to the electronic equipment without the feedback loop and with the shortage of FPGA resources, the baseband signal is processed by utilizing the predistortion coefficient calculated off line, so that the purpose of compensating the nonlinear characteristic of the power amplifier of the electronic equipment and ensuring the efficiency of the power amplifier is realized.
Optionally, the above embodiment describes an online use stage. Before performing the online usage phase, the electronic device needs to perform offline learning to obtain the table of predistortion coefficients. In the off-line learning stage, the electronic equipment sets environmental parameters of a test environment, wherein the environmental parameters of the test environment comprise at least one of temperature, frequency point and voltage of the electronic equipment, the number of the test environments is at least one, and the at least one test environment comprises the current working environment. And then, the electronic equipment generates a baseband test signal aiming at the test environment and generates the predistortion coefficient table according to the baseband test signal.
For example, in the offline learning phase, the electronic device may provide a setting interface through which a user sets the environment parameters of the testing environment. For example, please refer to fig. 5.
Fig. 5 is a schematic view of an environment parameter setting interface in the short-wave communication method based on open loop according to the embodiment of the present application. Based on the setting interface, the user can set a file saving path, order, depth, training signal type, and the like. The user can flexibly set the type of the training signal through a pull-down menu button on the setting interface, wherein the pull-down menu button is shown as a black filled triangle in the figure. The training signal may be a monophonic signal, a biphone signal, etc. The training signal is a baseband test signal, etc.
In addition, the user can set the instrument through a setting interface, such as frequency, signal source power and the like. The setting interface is provided with a plurality of buttons, such as an initialization button, a baseband test signal loading button, a predistortion baseband test signal loading button and the like, and different instructions can be input into the electronic equipment by touching or clicking different buttons by a mouse so as to trigger the electronic equipment to execute corresponding tasks.
After the user sets the environmental parameters through the setting interface, the electronic equipment generates a baseband test signal. The electronic device then generates predistortion coefficients from the baseband test signal. The electronic equipment generates predistortion coefficients for different environment parameters and stores the corresponding relation between the environment parameters and the predistortion coefficients in a predistortion coefficient table. And then writing the predistortion coefficient table into an FPGA program of the electronic equipment.
By adopting the scheme, the electronic equipment generates the predistortion coefficients corresponding to different environmental parameters through offline learning, and the aim of accurately generating the predistortion coefficients is fulfilled.
Fig. 6 is an instrument architecture diagram for calculating predistortion coefficients based on an open-loop short-wave communication method according to an embodiment of the present application. Referring to fig. 6, the instrument architecture includes electronics, a vector signal source, a power amplifier, an attenuator, and a spectrum analyzer. The electronic equipment is connected with the vector signal source through a network cable or a General-purpose input/output (GPIO) control line, the electronic equipment is connected with the frequency spectrometer through the network or the GPIO control line, the vector signal source is connected with the power amplifier, the power amplifier is connected with the attenuator, and the attenuator is connected with the frequency spectrometer. Based on the instrument architecture, the offline learning phase is shown in fig. 7.
Fig. 7 is a flowchart of an offline learning stage in the open-loop-based short-wave communication method provided in the embodiment of the present application, where the embodiment includes:
701. the electronic device generates a baseband test signal.
Illustratively, the electronic device is installed with software such as MATLAB. After the electronic equipment sets the environmental parameters, the electronic equipment generates a baseband test signal by using MATLAB software under the environmental parameters. The baseband test signals under different circumstances may be the same or different.
702. And performing up-conversion on the baseband test signal to obtain a first radio frequency signal, and inputting the first radio frequency signal to a power amplifier to obtain a first amplified signal.
Illustratively, the electronic device downloads a baseband test signal into the vector signal source and up-converts the baseband test signal using the vector signal source to obtain the first radio frequency signal. The first radio frequency signal passes through a power amplifier to obtain a first amplified signal.
And then, determining a predistortion coefficient corresponding to the environment parameter of the test environment according to the first amplification signal, and storing the predistortion coefficient corresponding to the test environment into a predistortion coefficient table.
By adopting the scheme, the electronic equipment generates a standard test baseband signal, the off-line learning process is simplified, and the electronic equipment can flexibly change the waveform of the baseband test signal and is convenient for switching the baseband test signal and a distortion signal.
Optionally, the process of determining the predistortion coefficients corresponding to the environmental parameters of the test environment according to the first amplified signal may refer to steps 703 to 704.
703. And determining a second baseband signal corresponding to the first amplified signal.
Illustratively, a first amplified signal output by the power amplifier is input to the attenuator, and is sent to the frequency spectrograph after being attenuated properly, the frequency spectrum of the first amplified signal is observed by the frequency spectrograph, and a first nonlinear distortion result corresponding to the first amplified signal is recorded. Meanwhile, the frequency spectrograph is controlled through the electronic equipment, and a second baseband signal corresponding to the first amplified signal is obtained by utilizing an IQ Trace function of the frequency spectrograph. The second baseband signal and the first nonlinear distortion result are transmitted to an electronic device.
704. The electronic device analyzes the second baseband signal to determine a predistortion coefficient corresponding to an environmental parameter of the test environment.
Illustratively, the electronic device analyzes the nonlinear characteristics, the memorability characteristics, and the like of the second baseband signal, selects a suitable predistortion model and a predistortion coefficient calculation method, and calculates the predistortion coefficient in an off-line manner.
By adopting the scheme, the aim of accurately calculating the predistortion coefficient by the electronic equipment is fulfilled.
Optionally, after the electronic device calculates the predistortion coefficient, the predistortion coefficient needs to be verified, and when the calculated predistortion coefficient meets the storage condition, the predistortion coefficient is stored in the predistortion coefficient table; and if the calculated predistortion coefficient does not accord with the storage condition, the predistortion coefficient needs to be reselected and calculated. The verification process is shown as follows in steps 705-707.
705. And carrying out predistortion treatment on the baseband test signal according to a predistortion coefficient corresponding to the environmental parameter of the test environment to obtain a second distortion signal.
Illustratively, the electronic device obtains a predistortion model by using the predistortion coefficient, and performs predistortion processing on a baseband test signal generated by MATLAB software and the like by using the predistortion model to obtain a second distortion signal.
706. The electronic equipment performs up-conversion on the second distortion signal to obtain a second radio frequency signal, and inputs the second radio frequency signal to the power amplifier to obtain a second amplified signal.
Illustratively, the electronic device downloads the second distorted signal to the vector signal source, adjusts the frequency of the vector signal source to make the output signal of the power amplifier reach the rated power, and then performs up-conversion on the second distorted signal by using the digital up-conversion function of the vector signal source to obtain a second radio frequency signal, which is input to the power amplifier to obtain a second amplified signal.
707. Determining whether to store a predistortion coefficient corresponding to the test environment into the predistortion coefficient table according to a nonlinear distortion result of the second amplified signal; if the predistortion coefficients are stored, go to step 708; if no predistortion coefficients are stored, step 704 is performed.
Illustratively, the second amplified signal is transmitted to the spectrometer after being attenuated by a suitable power, the spectrum of the second amplified signal is observed by the spectrometer, and a second nonlinear distortion result of the second amplified signal is recorded.
Then, the electronic device controls the spectrometer, and observes the second nonlinear distortion result through the spectrometer, and if the second nonlinear distortion result is good, step 708 is executed; if the second non-linear distortion result is poor, step 704 is executed.
708. And storing the predistortion coefficient corresponding to the test environment into the predistortion coefficient table.
Illustratively, in addition to storing the predistortion coefficients, the electronic device also stores various items of data generated in the offline learning stage, waveform files, and the like. Each item of data comprises a first nonlinear distortion result, a second nonlinear distortion result and the like, and the waveform file comprises a test baseband signal, a second distortion signal and the like.
By adopting the scheme, the predistortion coefficient is verified after being calculated each time, and only the predistortion coefficient passing the verification can be stored in the predistortion coefficient table, so that the accuracy of the predistortion coefficient table is improved.
Optionally, in the above embodiment, when determining whether to store the predistortion coefficient corresponding to the test environment into the predistortion coefficient table according to the nonlinear distortion result of the second amplified signal, and when the nonlinear result is less than or equal to a preset threshold, storing the predistortion coefficient corresponding to the test environment into the predistortion coefficient table; and when the nonlinear result is larger than a preset threshold value, not storing the predistortion coefficient corresponding to the test environment.
Illustratively, a threshold value is preset, and the threshold value is-40 dB, for example, when the second nonlinear distortion result is-45 dB and-50 dB, the nonlinearity of the power amplifier is improved, and the predistortion coefficient is reserved. And when the second nonlinear distortion result is-35 dB, -30dB and the like, the nonlinear characteristic of the power amplifier is not improved, and the predistortion coefficient is discarded.
In the above embodiments, the first non-linear result and the second non-linear result represent some distortion indicators, such as Adjacent-Channel Power Rejection (ACPR), intermodulation indicators, and the like.
By adopting the scheme, whether the predistortion coefficient is stored in the predistortion coefficient table or not is determined by comparing the similarity of the first nonlinear result and the second nonlinear result, the calculation amount is small, the process is simple, and the calculation resources of the electronic equipment and the like are saved to a certain extent.
Optionally, the baseband test signal is, for example, a multitone signal, and the multitone signal is generated by superimposing a plurality of independent sinusoidal signal waveforms. The polyphonic signals with frequencies of 940Hz, 960Hz, 980Hz, 1000Hz, 1020Hz, 1040Hz, 1060Hz and the like can be obtained through MATLAB simulation.
By adopting the scheme, the intermodulation index of the electronic equipment transmitter is set as the third-order intermodulation index, so that the third-order intermodulation index of the electronic equipment transmitter can be better improved by taking the polyphonic signal as the test baseband signal.
Optionally, in the foregoing embodiment, the predistortion model is, for example, a nonlinear characteristic model, and the expression is as in formula (1):
where x (n) represents the baseband test signal, i.e., the input signal of the predistortion model. a represents a predistortion coefficient of the predistortion model. n represents the sampling serial number of the signal, M is a memory polynomial which is used for representing the memory characteristic of the power amplifier and representing that the output of the power amplifier is related to the first M symbols of the input signal. K is the nonlinear characteristic of the memory polynomial. Considering that the short-wave power amplifier may have a memory characteristic in addition to the ubiquitous nonlinear characteristic, the first predistortion model needs to compensate the memory characteristic of the power amplifier, so that a memory term is increased. Presetting the order of M and K, and when M is more than 0,k is more than 0, all a are mk Initialization is 0; when m =0, k =0, a 00 ＝1。
Writing equation (1) in a matrix manner, the following equation (2) is obtained:
z = XA formula (2)
In formula (2), X represents an input vector matrix of the predistortion model, and a represents a predistortion coefficient matrix of the predistortion model.
The expression of X is shown in the following formula (3), and the expression of A is shown in the following formula (4):
Z＝[z(n),…,z(n)|z(n)| K ,…,z(n-M),…,z(n-M)|z(n-M)| K ]formula (3)
A＝[a 00 ,…,a 0K ,…,a M0 ,…,a MK ]Formula (4)
Fig. 8 is a schematic structural diagram of an applicable predistortion model for an open-loop-based short-wave communication method provided in an embodiment of the present application.
Referring to fig. 8, the inputs to the model include the predistortion coefficients and the baseband test signal. The predistortion coefficient is the coefficient in the graph, the baseband test signal is divided into two paths of signals, and one path of signals is delayed for one clock period, so that the predistortion model obtains a memory item. Wherein the delay is as Z in the figure -1 Shown, the memory items are M in the figure 1 As shown. Another signal reaches M 0 ，M 0 The expansion of (c) is shown as the right polynomial model.
The input of the polynomial model is a baseband test signal and a predistortion coefficient, and after the absolute value of the input baseband test signal is taken, the 1 st power of the absolute value, the 2 nd power of the absolute value, the 3 rd power of the absolute value and the 4 th power of the absolute value are solved to obtain 4 powers. Then, each of the obtained powers is multiplied by the input baseband test signal itself to obtain a plurality of products, and the plurality of products and the baseband test signal itself have 5 paths of data. After 5 paths of data are obtained, each path of data is continuously multiplied by the predistortion coefficient to obtain M 0 To output of (c).
M 1 Compared to M 0 Delayed by one cycle, M 1 Is another set of coefficients, M 0 Output sum of M 1 The sum of the outputs of (a) and (b) constitutes the output of the predistortion model.
In fig. 8, the predistortion coefficient is represented as [ a ] 0 ,a 1 ,a 2 ,a 3 ,a 4 ]. For M 0 In terms of predistortion coefficient exampleSuch as being [ a ] 00 ,a 01 ,a 02 ,a 03 ,a 04 ]、M 1 For example, [ a ] 10 ,a 11 ,a 12 ,a 13 ,a 14 ]。
Optionally, in step 704, the electronic device determines the predistortion coefficients of the predistortion model by using a least square method (LS). The algorithm formula is as follows:
A＝(X H X) -1 X H z formula (5)
Wherein " H "represents a conjugate transpose operation" -1 "represents the conventional matrix inversion operation, (X) H X) -1 X H The generalized inverse matrix, also called matrix X, i.e. the left inverse matrix, a is the predistortion coefficient obtained by the LS algorithm.
Optionally, in the above embodiment, the predistortion coefficients may be different according to different test environments. The environmental parameters of the test environment include frequency band, temperature or voltage. That is, the electronic device operates in different frequency bands, different temperatures, or different power supplies, which results in different predistortion coefficients. Therefore, in the off-line learning stage, the electronic device calculates the predistortion coefficients under different test environments, so as to obtain the predistortion coefficient table.
Fig. 9 is a schematic process diagram for online use in the open-loop-based short-wave communication method provided in the embodiment of the present application.
Referring to fig. 9, the electronic device includes a parameter measuring module, a table address generating module, a predistortion coefficient table module, a signal processing module, and an up-conversion module. The input end of the parameter testing module is connected with a peripheral circuit and a main control, the peripheral circuit is a circuit used for detecting environmental parameters such as temperature, voltage, frequency points and the like of the current working environment, and the main control is a logic control unit which selects whether to start a predistortion function and which group of predistortion coefficients according to the detected environmental parameters.
The parameter measuring module finishes the measurement of the current working temperature, voltage and working frequency of the power amplifier, and the output end of the parameter measuring module is connected with the table address generating module.
The input end of the table address generating module is connected with the parameter measuring module. After the table address generating module obtains the environment parameters, the address of the predistortion coefficient table corresponding to the environment parameters is searched according to the environment parameters, and the address is input to the predistortion coefficient table module.
The predistortion coefficient table module searches for a predistortion coefficient according to the address and sends the predistortion coefficient to the signal processing module, the signal processing module generates a predistortion model according to the predistortion coefficient, and the predistortion model is used for carrying out predistortion processing on a first baseband signal to obtain a first distortion signal and output the first distortion signal.
The first distortion signal reaches the up-conversion module to obtain a radio frequency signal and is output through a power amplifier.
Referring to fig. 3, the modules shown in fig. 9 are included in the predistortion unit shown in fig. 3. The online using process is realized in the FPGA, and the implementation manner of the predistortion coefficient table in the FPGA is realized by a Block Random Access Memory (BRAM).
Fig. 10 is an effect diagram of a short-wave communication method based on open loop according to an embodiment of the present application. Referring to fig. 10, the electronic device can obtain a dotted line according to the first non-linear distortion result, the dotted line indicates that no pre-distortion processing is performed, and the dotted line indicates that the pre-distortion processing is performed according to the second non-linear distortion result, and the solid line indicates that the pre-distortion processing is performed. It can be seen from this that: the third-order intermodulation index (2 MHz-30 MHz) of the transmitter is improved from the original-20 dB to more than-40 dB by using the predistortion treatment technology, and the frequency spectrum quality of the transmitter is greatly improved.
The following are embodiments of the apparatus of the present application that may be used to perform embodiments of the method of the present application. For details which are not disclosed in the embodiments of the apparatus of the present application, reference is made to the embodiments of the method of the present application.
Fig. 11 is a schematic structural diagram of an open-loop-based short-wave communication device according to an embodiment of the present application. The open-loop-based short-wave communication apparatus 1100 includes: a first determining module 1101, a second determining module 1102, a processing module 1103 and a communication module 1104.
A first determining module 1101, configured to determine an environmental parameter of a current working environment of the electronic device;
a second determining module 1102, configured to determine a predistortion coefficient from a predistortion coefficient table according to the environment parameter, where the predistortion coefficient table stores a correspondence between the environment parameter and the predistortion coefficient in different working environments;
a processing module 1103, configured to perform predistortion processing on the first baseband signal according to the predistortion coefficient to obtain a first distortion signal;
and a communication module 1104 for performing short-wave communication according to the first distortion signal.
Optionally, referring to fig. 11 again, in a possible implementation manner, the short-wave communication apparatus 1100 based on open-loop further includes:
an offline module 1105, configured to set an environmental parameter of a test environment before the second determining module 1102 determines the predistortion coefficient from a predistortion coefficient table according to the environmental parameter, where the environmental parameter of the test environment includes at least one of a temperature, a frequency point, and a voltage of the electronic device, the test environment is at least one, and the at least one test environment includes the current working environment; generating a baseband test signal for the test environment; and generating the predistortion coefficient table according to the baseband test signal.
In a feasible implementation manner, when the offline module 1105 generates the predistortion coefficient table according to the baseband test signal, it is configured to perform up-conversion on the baseband test signal to obtain a first radio frequency signal; inputting the first radio frequency signal to a power amplifier to obtain a first amplified signal; determining a predistortion coefficient corresponding to the environmental parameter of the test environment according to the first amplification signal; and storing the predistortion coefficient corresponding to the test environment into the predistortion coefficient table.
In a feasible implementation manner, when determining the predistortion coefficient corresponding to the environmental parameter of the test environment according to the first amplified signal, the offline module 1105 is configured to determine a second baseband signal corresponding to the first amplified signal; and analyzing the second baseband signal to determine a predistortion coefficient corresponding to the environmental parameter of the test environment.
In a feasible implementation manner, the offline module 1105 is further configured to perform predistortion processing on the baseband test signal according to the predistortion coefficient corresponding to the environment parameter of the test environment before storing the predistortion coefficient corresponding to the test environment in the predistortion coefficient table, so as to obtain a second distortion signal; performing up-conversion on the second distortion signal to obtain a second radio frequency signal; inputting the second radio frequency signal to the power amplifier to obtain a second amplified signal; and determining whether to store a predistortion coefficient corresponding to the test environment into the predistortion coefficient table according to a nonlinear distortion result of the second amplified signal.
In a possible implementation manner, the offline module 1105 determines, according to a nonlinear distortion result of the second amplified signal, whether to store the predistortion coefficient corresponding to the test environment into the predistortion coefficient table, where the predistortion coefficient corresponding to the test environment is stored into the predistortion coefficient table when the nonlinear distortion result is less than or equal to a preset threshold; and when the nonlinear result is larger than a preset threshold value, not storing the predistortion coefficient corresponding to the test environment.
In one possible implementation, the baseband test signal is a multi-tone signal.
The short-wave communication device based on the open loop provided by the embodiment of the application can execute the actions of the electronic equipment in the embodiment, the implementation principle and the technical effect are similar, and the details are not repeated.
Fig. 12 is a schematic structural diagram of an electronic device according to an embodiment of the present application. As shown in fig. 12, the electronic apparatus 1200 includes:
a processor 1201 and a memory 1202;
the memory 1202 stores computer instructions;
the processor 1201 executes the computer instructions stored by the memory 1202 to cause the processor 1201 to perform the open loop based short wave communication method as described above.
For a specific implementation process of the processor 1201, reference may be made to the above method embodiments, which implement principles and technical effects are similar, and details are not described herein again.
Optionally, the electronic device 12000 further includes a communication section 1203. The processor 1201, the memory 1202, and the communication section 1203 may be connected by a bus 1204.
The embodiment of the present application further provides a computer-readable storage medium, in which computer instructions are stored, and when executed by a processor, the computer instructions are used to implement the open-loop-based short-wave communication method as described above.
Embodiments of the present application further provide a computer program product, which contains a computer program, and when the computer program is executed by a processor, the short-wave communication method based on open loop as described above is implemented.
Other embodiments of the present application will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the application and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the application being indicated by the following claims.
It will be understood that the present application is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the application is limited only by the appended claims.
Claims (10)
1. An open-loop-based short-wave communication method, applied to an electronic device, includes:
determining environmental parameters of the current working environment of the electronic equipment;
determining a predistortion coefficient from a predistortion coefficient table according to the environment parameter, wherein the predistortion coefficient table stores the corresponding relation between the environment parameter and the predistortion coefficient under different working environments;
carrying out predistortion processing on the first baseband signal according to the predistortion coefficient to obtain a first distortion signal;
and carrying out short-wave communication according to the first distortion signal.
2. The method of claim 1, wherein before determining the predistortion coefficients from a table of predistortion coefficients based on the environmental parameter, further comprising:
setting environmental parameters of a test environment, wherein the environmental parameters of the test environment comprise at least one of temperature, frequency point and voltage of the electronic equipment, the number of the test environments is at least one, and the at least one test environment comprises the current working environment;
generating a baseband test signal for the test environment;
and generating the predistortion coefficient table according to the baseband test signal.
3. The method of claim 2, wherein generating the table of predistortion coefficients from the baseband test signal comprises:
performing up-conversion on the baseband test signal to obtain a first radio frequency signal;
inputting the first radio frequency signal to a power amplifier to obtain a first amplified signal;
determining a predistortion coefficient corresponding to the environmental parameter of the test environment according to the first amplification signal;
and storing the predistortion coefficient corresponding to the test environment into the predistortion coefficient table.
4. The method of claim 3, wherein determining the pre-distortion coefficient corresponding to the environmental parameter of the test environment according to the first amplified signal comprises:
determining a second baseband signal corresponding to the first amplified signal;
and analyzing the second baseband signal to determine a predistortion coefficient corresponding to the environmental parameter of the test environment.
5. The method according to claim 3 or 4, wherein before storing the predistortion coefficients corresponding to the test environment into the predistortion coefficient table, the method further comprises:
carrying out predistortion treatment on the baseband test signal according to a predistortion coefficient corresponding to the environmental parameter of the test environment to obtain a second distorted signal;
performing up-conversion on the second distortion signal to obtain a second radio frequency signal;
inputting the second radio frequency signal to the power amplifier to obtain a second amplified signal;
and determining whether to store a predistortion coefficient corresponding to the test environment into the predistortion coefficient table according to a nonlinear distortion result of the second amplified signal.
6. The method of claim 5, wherein determining whether to store the pre-distortion coefficients corresponding to the test environment in the pre-distortion coefficient table according to the non-linear distortion result of the second amplified signal comprises:
when the nonlinear result is smaller than or equal to a preset threshold value, storing a predistortion coefficient corresponding to the test environment into the predistortion coefficient table;
and when the nonlinear result is larger than a preset threshold value, not storing the predistortion coefficient corresponding to the test environment.
7. The method of any of claims 2-4, wherein the baseband test signal is a multi-tone signal.
8. An open-loop-based short-wave communication device, comprising:
the first determining module is used for determining the environmental parameters of the current working environment of the electronic equipment;
the second determining module is used for determining a predistortion coefficient from a predistortion coefficient table according to the environment parameter, and the predistortion coefficient table stores the corresponding relation between the environment parameter and the predistortion coefficient under different working environments;
the processing module is used for carrying out predistortion processing on the first baseband signal according to the predistortion coefficient to obtain a first distortion signal;
and the communication module is used for carrying out short-wave communication according to the first distortion signal.
9. An electronic device comprising a processor, a memory, and a computer program stored on the memory and executable on the processor, wherein execution of the computer program by the processor causes the electronic device to perform the method of any of claims 1-7.
10. A computer-readable storage medium having stored therein computer instructions for implementing the method of any one of claims 1-7 when executed by a processor.
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| CN116582395B (en) * | 2023-05-22 | 2024-01-30 | 深圳市菲尔康通讯有限公司 | Synchronous data processing method, system and storage medium based on 5G NR signal |
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