Broadband radio frequency communication signal EVM (Error Vector Magnitude) improvement method, device, equipment, medium and program product

Abstract

The invention provides a broadband radio frequency communication signal EVM (Error Vector Magnitude) improvement method, device and equipment, a medium and a program product, and the method comprises the steps: collecting the amplitude-frequency characteristics of a broadband radio frequency communication signal, combining the relative relation of the signal bandwidth, the sampling rate and the sampling interval, and obtaining the reciprocal of the in-band amplitude-frequency response vector of the signal to obtain the amplitude-frequency response of a digital compensation filter, thereby achieving the EVM improvement of the broadband radio frequency communication signal. IFFT processing is carried out on the amplitude-frequency response of the digital compensation filter to obtain the time domain coefficient of the digital compensation filter, the size of logic resources occupied by the digital compensation filter and the compensation performance of the digital compensation filter are comprehensively considered, meanwhile, the Gibbs effect caused by time domain interception is reduced, time domain windowing is carried out on the digital compensation filter, and then interception processing is carried out; the baseband signal is subjected to digital filtering by using the intercepted digital compensation filter coefficient with lower order, and the baseband signal subjected to digital compensation filtering can effectively compensate the unevenness of the broadband radio frequency communication signal caused by the analog up-converter and the power amplifier and improve the EVM index of the broadband radio frequency communication signal.

Description

Technical Field

[0001] The present invention relates to the field of satellite communication technology, and in particular to a method, device, equipment, medium and program product for improving EVM of a broadband radio frequency communication signal. Background Art

[0002] With the growing demand for satellite broadband services, the bandwidth of satellite communication signals has also expanded from tens of kHz to hundreds of MHz. In order to ensure the efficient output of wireless signals, it is necessary to use an analog up-converter to shift the frequency of the intermediate frequency communication signal, and use a power amplifier to amplify the power of the RF communication signal, and input the high-power RF communication signal to the transmitting antenna. In the case of large bandwidth and high gain, the in-band flatness of the frequency conversion and power amplifier channels is difficult to guarantee through hardware. The broadband RF communication signal usually has large amplitude fluctuations and distortions in the band, and the EVM index (Error Vector Magnitude) of the signal will be significantly deteriorated. If no corresponding compensation is performed, it may cause demodulation difficulties at the receiving end. In response to the deterioration of the signal quality of broadband RF communication signals caused by the frequency conversion and power amplifier channels, most existing methods choose to use iterative algorithms to design high-order compensation filters to complete the compensation of signal flatness, or perform channel estimation based on the signal pilot sequence to complete the channel filtering of frequency domain synchronous correction. The existing methods are highly complex to implement, and the designed filters are usually of high order and have poor versatility. Summary of the invention

[0003] The present invention aims to provide a method, device, equipment, medium and program product for improving the EVM of a broadband radio frequency communication signal to solve the problems existing in the above-mentioned existing methods.

[0004] A method for improving EVM of a broadband radio frequency communication signal provided by the present invention comprises the following steps:

[0005] Step 1, collecting the amplitude-frequency characteristics of the broadband RF signal, and screening out the amplitude-frequency response vector Resp_N;

[0006] Step 2: Based on the amplitude-frequency response vector Resp_N, obtain a vector with a length of N. s The amplitude-frequency response vector to be compensated Freq_N s ;

[0007] Step 3: The amplitude-frequency response vector Freq_N to be compensated s Take the inverse to get the amplitude-frequency response Trim_N of the digital compensation filter s , for the amplitude-frequency response Trim_N s Perform IFFT processing to obtain a length of N s Digital compensation filter coefficient Coeff_N s;

[0008] Step 4: Generate a length of N s The window function vector Win_N s , for a length of N s Digital compensation filter coefficient Coeff_N s Perform windowing processing and obtain a windowed length of N s Digital compensation filter coefficient CoeffWin_N s ;

[0009] Step 5: According to the actual effect of the digital compensation filter coefficient length L, L ≤ N s , intercept the digital compensation filter coefficient CoeffWin_N s The center point L is taken as the final digital compensation filter coefficient CoeffUse_L;

[0010] Step 6: configure the digital compensation filter coefficient CoeffUse_L into the digital compensation filter to complete the filtering process and complete the channel compensation for the broadband radio frequency communication signal.

[0011] In some embodiments, in step 1, the center frequency of the spectrum analyzer is set to f c , the sampling bandwidth is set to F B , F B ≥B, the frequency interval of the spectrum analyzer for amplitude-frequency characteristic acquisition is Δf, the amplitude-frequency characteristic acquisition of the broadband RF signal is completed, and the sampling frequency point is selected The amplitude-frequency response vector within the interval is denoted as Resp_N, and its length is N; where B is the signal bandwidth.

[0012] In some embodiments, in step 2, the sampling rate F of the digital compensation filter is s , calculate the number of frequency sampling points N required under the frequency interval Δf s =F s / Δf; the amplitude-frequency response vector Resp_N is taken as N s The center of the point vector is point N, and the two ends are symmetrically filled with 1 to obtain a length of N s The amplitude-frequency response vector to be compensated Freq_N s .

[0013] The present invention also provides a broadband radio frequency communication signal EVM improvement device based on digital filtering compensation, comprising:

[0014] A spectrum analyzer is used to collect the amplitude-frequency characteristics of broadband RF signals and screen out the amplitude-frequency response vector Resp_N;

[0015] The first processing unit is used to obtain a vector with a length of N based on the amplitude-frequency response vector Resp_N. s The amplitude-frequency response vector to be compensated Freq_N s ;

[0016] The second processing unit is used to compensate the amplitude-frequency response vector Freq_N s Take the inverse to get the amplitude-frequency response Trim_N of the digital compensation filter s , for the amplitude-frequency response Trim_N s Perform IFFT processing to obtain a length of N s Digital compensation filter coefficient Coeff_N s ;

[0017] The third processing unit is used to generate a length of N s The window function vector Win_N s , for a length of N s Digital compensation filter coefficient Coeff_N s Perform windowing processing and obtain a windowed length of N s Digital compensation filter coefficient CoeffWin_N s ;

[0018] The fourth processing unit is used to compensate the filter coefficient length L according to the actual effect, L≤N s , intercept the digital compensation filter coefficient CoeffWin_N s The center point L is taken as the final digital compensation filter coefficient CoeffUse_L;

[0019] The fifth processing unit is used to configure the digital compensation filter coefficient CoeffUse_L into the digital compensation filter, complete the filtering process, and complete the channel compensation of the broadband radio frequency communication signal.

[0020] The present invention also provides an electronic device, comprising:

[0021] at least one processor; and a memory communicatively coupled to the at least one processor;

[0022] The memory stores instructions that can be executed by the at least one processor, and the at least one processor executes the above method by executing the instructions stored in the memory.

[0023] The present invention also provides a computer-readable storage medium, wherein the computer-readable storage medium is used to store instructions, and when the instructions are executed, the method according to any one of claims 1 to 3 is implemented.

[0024] The present invention also provides a computer program product, which, when called by a computer, enables the computer to execute the above method.

[0025] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0026] 1. The present invention can support the improvement of EVM of broadband RF communication signals with any bandwidth and any RF frequency, regardless of the communication signal system. Taking a broadband RF communication signal with a RF center frequency in the QV band, a signal bandwidth of 900MHz (symbol rate of 750Msps, roll-off factor of 0.2), and a modulation mode of 16APSK as an example, the method of the present invention is used to generate a digital compensation filter coefficient with a length of 11, and digital compensation filtering is completed in the digital signal generation process, which can effectively improve the spectrum asymmetry of the RF signal, reduce the in-band flatness of the RF signal from 3dB to 1.8dB, and optimize the RF signal EVM from 21.2% to 5.7%.

[0027] 2. The present invention only needs to perform corresponding compensation filtering processing in the digital domain, and only appropriately increases the FPGA logic resources required for the digital signal generation process. It does not involve hardware modifications to the analog up-converter and the power amplifier. Compared with other methods based on iterative algorithm to design compensation filters, the implementation complexity is low and the filter order is low, and the occupied FPGA logic resources are small; compared with other methods based on channel estimation compensation, there is no need for signal pilot as prior information, and the implementation is highly versatile. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 Schematic diagram of the principle of a method for improving EVM of a broadband radio frequency communication signal in an embodiment of the present invention.

[0029] Figure 2 Flow chart of a method for improving EVM of a broadband RF communication signal according to an embodiment of the present invention.

[0030] Figure 3 : This is the amplitude-frequency characteristic of the broadband intermediate frequency communication signal in an embodiment of the present invention (Note: the intermediate frequency point is located in the L frequency band, and the in-band flatness of the broadband intermediate frequency communication signal is about 0.5 dB).

[0031] Figure 4 This is the EVM measurement result of the broadband intermediate frequency communication signal in an embodiment of the present invention (Note: the intermediate frequency point is located in the L frequency band, and the EVM of the broadband intermediate frequency communication signal is 4.3).

[0032] Figure 5 The amplitude-frequency characteristics of the broadband RF communication signal before digital filtering compensation in the embodiment of the present invention (Note: the RF frequency point is located in the QV frequency band, and the in-band flatness of the RF signal before digital filtering compensation is about 3dB, Figure 5The signals in the two frequency bands of the left and right boxes show obvious asymmetric distortion).

[0033] Figure 6 This is the EVM measurement result of the broadband RF communication signal before digital filtering compensation in an embodiment of the present invention (Note: the RF frequency point is located in the QV frequency band, and the EVM of the broadband RF communication signal before digital filtering compensation is 21.2).

[0034] Figure 7 1 is the amplitude-frequency characteristic within the broadband radio frequency signal band in an embodiment of the present invention (Note: based on the amplitude-frequency response vector plot collected by the spectrum analyzer, it corresponds to the frequency range of the signal with a bandwidth of 900M).

[0035] Figure 8 : is the amplitude-frequency response of the digital compensation filter in the embodiment of the present invention (Note: the horizontal axis is normalized to Fs=1.5 GHz).

[0036] Fig. 9 The amplitude-frequency characteristics of the broadband RF communication signal after digital filtering compensation in the embodiment of the present invention (Note: the RF frequency point is located in the QV frequency band, and the in-band flatness of the RF signal after digital filtering compensation is about 1.8dB, compared with Figure 5 As a result, the asymmetric distortion of the signal in the two frequency bands of the left and right boxes in the figure has been significantly improved).

[0037] Fig.10 This is the EVM measurement result of the broadband RF communication signal after digital filtering compensation in an embodiment of the present invention (Note: the RF frequency point is located in the QV frequency band, and the EVM of the broadband RF communication signal after digital filtering compensation is 5.7).

[0038] Fig.11 The figure is a structural diagram of an electronic device in an embodiment of the present invention. DETAILED DESCRIPTION

[0039] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0040] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0041] like Figure 1 As shown, this embodiment proposes a method for improving the EVM of a broadband radio frequency communication signal, by collecting the amplitude-frequency characteristics of the broadband radio frequency communication signal, combining the relative relationship between the signal bandwidth, the sampling rate and the sampling interval, taking the inverse of the in-band amplitude-frequency response vector of the signal to obtain the amplitude-frequency response of the digital compensation filter, performing IFFT processing on the amplitude-frequency response of the digital compensation filter, obtaining the time domain coefficient of the digital compensation filter, comprehensively considering the size of the logic resources occupied by the digital compensation filter and its compensation performance, while reducing the Gibbs effect caused by time domain truncation, performing time domain windowing and then truncation processing, and using the digital compensation filter coefficients of the lower order after truncation to digitally filter the baseband signal, the baseband signal after digital compensation filtering can effectively compensate for the unevenness of the broadband radio frequency communication signal caused by the analog up-converter and the power amplifier, and improve its EVM index.

[0042] The above method is applicable to communication signals of any bandwidth and RF frequency, as well as any FPGA chip, and does not require hardware modification of the analog up-converter and power amplifier. Assume that the signal bandwidth is B and the frequency of the RF communication signal is f c , the digital compensation filter is at F s The baseband signal is filtered at the sampling rate, such as Figure 2 As shown, the specific steps of the broadband RF communication signal EVM improvement method are as follows:

[0043] Step 1: Set the center frequency of the spectrum analyzer to f c , the sampling bandwidth is set to F B (F B ≥B), the frequency interval of the spectrum analyzer for amplitude-frequency characteristic acquisition is Δf, the amplitude-frequency characteristic acquisition of the broadband RF signal is completed, and the sampling frequency point is selected The amplitude-frequency response vector within the interval is denoted as Resp_N, and its length is N;

[0044] Step 2: Based on the sampling rate F of the digital compensation filter s , calculate the number of frequency sampling points N required under the frequency interval Δf s =F s / Δf; the amplitude-frequency response vector Resp_N is taken as N s The center of the point vector is point N, and the two ends are symmetrically filled with 1 to obtain a length of N s The amplitude-frequency response vector to be compensated Freq_N s ;

[0045] Step 3: The amplitude-frequency response vector Freq_N to be compensated s Take the inverse to get the amplitude-frequency response Trim_N of the digital compensation filter s , for the amplitude-frequency response Trim_Ns Perform IFFT processing to obtain a length of N s Digital compensation filter coefficient Coeff_N s ;

[0046] Step 4: Generate a length of N s The window function vector Win_N s , for a length of N s Digital compensation filter coefficient Coeff_N s Perform windowing processing and obtain a windowed length of N s Digital compensation filter coefficient CoeffWin_N s ;

[0047] Step 5: According to the actual effect, s The coefficient length of the digital compensation filter at the sampling rate is L (L≤N s ), the length of the window added in step 4 is N s Digital compensation filter coefficient CoeffWin_N s The center point L is taken as the final digital compensation filter coefficient CoeffUse_L;

[0048] Step 6: Configure the digital compensation filter coefficient CoeffUse_L into the digital compensation filter to complete the F s The digital data is filtered at the sampling rate to complete the channel compensation of the broadband RF communication signal.

[0049] An example:

[0050] Take the broadband communication signal with the intermediate frequency in the L band, symbol rate of 750Msps, roll-off factor of 0.2, and modulation mode of 16APSK as an example: the amplitude-frequency characteristics of the broadband intermediate frequency communication signal are as follows: Figure 3 As shown, its in-band flatness is about 0.5dB, and its spectrum has good symmetry; the EVM of the broadband intermediate frequency communication signal is as follows Figure 4 As shown in Figure 1, its EVM is 4.3. The frequency of the RF signal output by the analog up-converter and power amplifier is located in the QV frequency band. Before digital filtering compensation, the amplitude-frequency characteristics of the broadband RF communication signal are as follows: Figure 5 As shown in Figure 1, its in-band flatness is about 3dB, and obvious asymmetric distortion appears on the left and right sides of its spectrum. At this time, the EVM of the broadband RF communication signal is as follows: Figure 6 As shown, its EVM is 21.2. To improve the EVM of the broadband radio frequency communication signal, the broadband radio frequency communication signal EVM improvement method of the present invention is adopted, and the specific processing process is as follows:

[0051] Step 1: Set the center frequency f of the spectrum analyzer cThe sampling bandwidth F is 3X.XXGHz. B The acquisition frequency interval Δf is 1.83 MHz, and the amplitude-frequency characteristics of the broadband RF signal are acquired. Figure 7 As shown, the sampling frequency points are selected at [(f c -0.45)GHz, (f c +0.45)GHz], the amplitude-frequency response vector Resp_N, whose length N is 491;

[0052] Step 2: Sampling rate F of the digital compensation filter s The number of frequency sampling points required is N when the frequency interval is Δf. s =820, Resp_N is taken as the center 491 point, and 1 is added to both ends to obtain the amplitude-frequency response vector Freq_N to be compensated with a length of 820 s ;

[0053] Step 3: The amplitude-frequency response vector Freq_N to be compensated s Take the inverse to get the amplitude-frequency response Trim_N of the digital compensation filter s , the amplitude-frequency response to Trim_N s Perform IFFT processing to obtain the digital compensation filter coefficient Coeff_N with a length of 820 s ;

[0054] Step 4: Generate a window function vector Win_N with a length of 820 s , for the digital compensation filter coefficient Coeff_N with a length of 820 s Perform windowing to obtain the digital compensation filter coefficient CoeffWin_N with a window length of 820 s ;

[0055] Step 5: extract the digital compensation filter coefficient CoeffWin_N with a length of 820 s The central 11 points are used as the final digital compensation filter coefficient CoeffUse_L, and its amplitude-frequency response is as follows: Figure 8 shown.

[0056] Step 6, input CoeffUse_L into Figure 1 In the digital compensation filter, the channel compensation of the broadband RF communication signal is completed. After completing the digital filter compensation, the comparison Fig. 9 and Figure 5 , the flatness within the signal band is improved from 3dB to 1.8dB, and the asymmetry of the left and right sides of the signal spectrum is significantly improved; Fig.10 and Figure 6The EVM of broadband RF communication signals increased from 21.2 to 5.7, and the EVM index was significantly improved.

[0057] Based on the same inventive concept, this embodiment also provides a broadband radio frequency communication signal EVM improvement device based on digital filtering compensation, comprising:

[0058] A spectrum analyzer is used to collect the amplitude-frequency characteristics of broadband RF signals and screen out the amplitude-frequency response vector Resp_N;

[0059] The first processing unit is used to obtain a vector with a length of N based on the amplitude-frequency response vector Resp_N. s The amplitude-frequency response vector to be compensated Freq_N s ;

[0060] The second processing unit is used to compensate the amplitude-frequency response vector Freq_N s Take the inverse to get the amplitude-frequency response Trim_N of the digital compensation filter s , for the amplitude-frequency response Trim_N s Perform IFFT processing to obtain a length of N s Digital compensation filter coefficient Coeff_N s ;

[0061] The third processing unit is used to generate a length of N s The window function vector Win_N s , for a length of N s Digital compensation filter coefficient Coeff_N s Perform windowing processing and obtain a windowed length of N s Digital compensation filter coefficient CoeffWin_N s ;

[0062] The fourth processing unit is used to compensate the filter coefficient length L according to the actual effect, L≤N s , intercept the digital compensation filter coefficient CoeffWin_N s The center point L is taken as the final digital compensation filter coefficient CoeffUse_L;

[0063] The fifth processing unit is used to configure the digital compensation filter coefficient CoeffUse_L into the digital compensation filter, complete the filtering process, and complete the channel compensation of the broadband radio frequency communication signal.

[0064] The specific processing of each of the above functional units can refer to the description of the broadband RF communication signal EVM improvement method in the above embodiment, which will not be repeated here.

[0065] Based on the same technical concept, the embodiment of the present application also provides an electronic device, which can implement the broadband RF communication signal EVM improvement method provided in the above embodiment of the present application. In one embodiment, the electronic device can be a server, or a terminal device or other electronic device. Fig.11 As shown, the electronic device may include:

[0066] At least one processor, and a memory connected to the at least one processor. The specific connection medium between the processor and the memory is not limited in the embodiment of the present application. Fig.11 The example in this article is that the processor and memory are connected through a bus. Fig.11 The connections between other components are shown in bold lines, which are only for illustration and are not intended to be limiting. The bus can be divided into address bus, data bus, control bus, etc. Fig.11 In the diagram, only one thick line is used, but this does not mean that there is only one bus or only one type of bus. Alternatively, a processor can also be called a controller, and there is no limitation on the name.

[0067] In the embodiment of the present application, the memory stores instructions that can be executed by at least one processor, and the at least one processor can execute the broadband radio frequency communication signal EVM improvement method discussed above by executing the instructions stored in the memory. The processor can implement Fig.11 The functions of each module in the device shown.

[0068] Among them, the processor is the control center of the device, which can use various interfaces and lines to connect the various parts of the entire control device, and monitor the device as a whole by running or executing instructions stored in the memory and calling data stored in the memory, various functions of the device and processing data.

[0069] In an optional design, the processor may include one or more processing units, and the processor may integrate an application processor and a modem processor, wherein the application processor mainly processes an operating system, a user interface, and application programs, and the modem processor mainly processes wireless communications. It is understandable that the modem processor may not be integrated into the processor. In some embodiments, the processor and the memory may be implemented on the same chip, and in some embodiments, they may also be implemented separately on separate chips.

[0070] The processor may be a general-purpose processor, such as a CPU, a digital signal processor, an application-specific integrated circuit, a field programmable gate array or other programmable logic device, a discrete gate or transistor logic device, or a discrete hardware component, which may implement or execute the methods, steps, and logic block diagrams disclosed in the embodiments of the present application. A general-purpose processor may be a microprocessor or any conventional processor, etc. The steps of a broadband RF communication signal EVM improvement method disclosed in the embodiments of the present application may be directly embodied as being executed by a hardware processor, or may be executed by a combination of hardware and software modules in the processor.

[0071] As a non-volatile computer-readable storage medium, the memory can be used to store non-volatile software programs, non-volatile computer executable programs and modules. The memory can include at least one type of storage medium, for example, it can include flash memory, hard disk, multimedia card, card-type memory, random access memory (Random Access s Memory, RAM), static random access memory (Static Random Access Memory, SRAM), programmable read-only memory (Programmable Read Only Memory, PROM), read-only memory (Read Only Memory, ROM), electrically erasable programmable read-only memory (Electrically Erasable Programmable Read-Only Memory, EEPROM), magnetic storage, disk, optical disk, etc. The memory is any other medium that can be used to carry or store the desired program code in the form of instructions or data structures and can be accessed by a computer, but is not limited thereto. The memory in the embodiment of the present application can also be a circuit or any other device that can realize a storage function, for storing program instructions and / or data.

[0072] By designing and programming the processor, the code corresponding to the broadband RF communication signal EVM improvement method described in the above embodiment can be fixed into the chip, so that the chip can execute the code when running. Fig.11 The steps of a broadband radio frequency communication signal EVM improvement method of the embodiment shown are as follows: How to design and program a processor is a technique known to those skilled in the art and will not be described in detail here.

[0073] Based on the same inventive concept, an embodiment of the present application further provides a storage medium storing computer instructions. When the computer instructions are executed on a computer, the computer executes a broadband RF communication signal EVM improvement method discussed above.

[0074] In some optional embodiments, the present application also provides various aspects of a broadband RF communication signal EVM improvement method, which can also be implemented in the form of a program product, which includes a program code. When the program product is run on an apparatus, the program code is used to enable the control device to execute the steps of a broadband RF communication signal EVM improvement method according to various exemplary embodiments of the present application described above in this specification.

[0075] It should be noted that, although several units or subunits of the device are mentioned in the above detailed description, this division is merely exemplary and not mandatory. In fact, according to the embodiments of the present application, the features and functions of two or more units described above can be embodied in one unit. Conversely, the features and functions of a unit described above can be further divided into multiple units to be embodied. In addition, although the operation of the method of the present application is described in a specific order in the accompanying drawings, this does not require or imply that these operations must be performed in this specific order, or that all the operations shown must be performed to achieve the desired result. Additionally or alternatively, some steps can be omitted, multiple steps can be combined into one step for execution, and / or one step can be decomposed into multiple steps for execution.

[0076] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application may adopt the form of a computer program product implemented in one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) that include computer-usable program code.

[0077] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a server, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the process in the flowchart. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0078] Program code for performing the operations of the present application may be written using any combination of one or more programming languages, including object-oriented programming languages ​​such as Java, C++, etc., and conventional procedural programming languages ​​such as "C" or similar programming languages. The program code may be executed entirely on the user computing device, partially on the user device, as a stand-alone software package, partially on the user computing device and partially on a remote computing device, or entirely on a remote computing device or server.

[0079] Where a remote computing device is involved, the remote computing device may be connected to the user computing device through any type of network, including a local area network (LAN) or a wide area network (WAN), or may be connected to an external computing device (e.g., via the Internet using an Internet service provider).

[0080] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0081] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0082] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A method for improving EVM of broadband radio frequency communication signals, characterized in that: The steps include: Step 1, collecting the amplitude-frequency characteristics of the broadband RF signal, and screening out the amplitude-frequency response vector Resp_N; Step 2: Based on the amplitude-frequency response vector Resp_N, obtain a vector with a length of N. s The amplitude-frequency response vector to be compensated Freq_N s ; Step 3: The amplitude-frequency response vector Freq_N to be compensated s Take the inverse to get the amplitude-frequency response Trim_N of the digital compensation filter s , for the amplitude-frequency response Trim_N s Perform IFFT processing to obtain a length of N s Digital compensation filter coefficient Coeff_N s ; Step 4: Generate a length of N s The window function vector Win_N s , for a length of N s Digital compensation filter coefficient Coeff_N s Perform windowing processing and obtain a windowed length of N s Digital compensation filter coefficient CoeffWin_N s ; Step 5: According to the actual effect of the digital compensation filter coefficient length L, L ≤ N s , intercept the digital compensation filter coefficient CoeffWin_N s The center point L is taken as the final digital compensation filter coefficient CoeffUse_L; Step 6: configure the digital compensation filter coefficient CoeffUse_L into the digital compensation filter to complete the filtering process and complete the channel compensation for the broadband radio frequency communication signal.

2. The broadband RF communication signal EVM improvement method according to claim 1, characterized in that: In step 1, set the center frequency of the spectrum analyzer to f c , the sampling bandwidth is set to F B , F B ≥B, the frequency interval of the spectrum analyzer for amplitude-frequency characteristic acquisition is Δf, the amplitude-frequency characteristic acquisition of the broadband RF signal is completed, and the sampling frequency point is selected The amplitude-frequency response vector within the interval is denoted as Resp_N, and its length is N; where B is the signal bandwidth.

3. The broadband RF communication signal EVM improvement method according to claim 2, characterized in that: In step 2, according to the sampling rate F of the digital compensation filter s , calculate the number of frequency sampling points N required under the frequency interval Δf s =F s / Δf; the amplitude-frequency response vector Resp_N is taken as N s The center of the point vector is point N, and the two ends are symmetrically filled with 1 to obtain a length of N s The amplitude-frequency response vector to be compensated Freq_N s .

4. A broadband radio frequency communication signal EVM improvement device based on digital filtering compensation, characterized in that: include: A spectrum analyzer is used to collect the amplitude-frequency characteristics of broadband RF signals and screen out the amplitude-frequency response vector Resp_N; The first processing unit is used to obtain a vector with a length of N based on the amplitude-frequency response vector Resp_N. s The amplitude-frequency response vector to be compensated Freq_N s ; The second processing unit is used to compensate the amplitude-frequency response vector Freq_N s Take the inverse to get the amplitude-frequency response Trim_N of the digital compensation filter s , for the amplitude-frequency response Trim_N s Perform IFFT processing to obtain a length of N s Digital compensation filter coefficient Coeff_N s ; The third processing unit is used to generate a length of N s The window function vector Win_N s , for a length of N s Digital compensation filter coefficient Coeff_N s Perform windowing processing and obtain a windowed length of N s Digital compensation filter coefficient CoeffWin_N s ; The fourth processing unit is used to compensate the filter coefficient length L according to the actual effect, L≤N s , intercept the digital compensation filter coefficient CoeffWin_N s The center point L is taken as the final digital compensation filter coefficient CoeffUse_L; The fifth processing unit is used to configure the digital compensation filter coefficient CoeffUse_L into the digital compensation filter, complete the filtering process, and complete the channel compensation of the broadband radio frequency communication signal.

5. An electronic device, characterized in that: include: at least one processor; and a memory communicatively coupled to the at least one processor; The memory stores instructions that can be executed by the at least one processor, and the at least one processor executes the method as described in any one of claims 1 to 3 by executing the instructions stored in the memory.

6. A computer-readable storage medium, characterized in that: The computer-readable storage medium is used to store instructions, and when the instructions are executed, the method according to any one of claims 1 to 3 is implemented.

7. A computer program product, characterized in that When the computer program product is called by a computer, the computer executes the method according to any one of claims 1 to 3.

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