Analog filter configuration method and device in OFDM (Orthogonal Frequency Division Multiplexing) communication system

Abstract

The invention relates to an analog filter configuration method and device in an OFDM (Orthogonal Frequency Division Multiplexing) communication system. According to the method, parameters are configured for an analog filter, so that the center frequency of the analog filter translates from left to right, then analog signals are filtered under each configuration parameter, and filtered signal energy of a corresponding frequency point is obtained at a preset monitoring frequency point. And finally determining the optimal parameter of the analog filter through the relative magnitude of the signal energy of the preset monitoring frequency point. In the embodiment of the invention, the optimal parameter of the analog filter is determined through the signal energy of the preset monitoring frequency point, so that the center frequency of the analog filter is aligned with the center frequency of the target signal, the frequency component corresponding to the interference signal can be effectively filtered, and the receiving performance of the receiver is improved.

Description

Technical Field

[0001] The present invention relates to the field of smart grid communication, and in particular to a method and a device for configuring an analog filter in an OFDM communication system. Background Art

[0002] As the core component of the metering system, the dual-mode communication module based on broadband power carrier (HPLC) and wireless communication (HRF) is widely used in collectors, concentrators and terminal meters. OFDM modulation and demodulation technology is widely used in dual-mode communication modules due to its advantages such as high frequency band utilization, high transmission rate and strong anti-interference ability. In OFDM technology, each subcarrier is orthogonal to each other, allowing the subchannel spectrum to overlap for parallel data transmission. The signals of different subcarriers are independent of each other and will not interfere with each other, which can maximize the spectrum utilization.

[0003] In actual communication, the analog signal received by the receiving end of the dual-mode communication module will pass through the mixer, analog filter and analog-to-digital converter before being demodulated and processed in the baseband. However, in the dual-mode communication interoperability protocol, the frequency band range of wireless communication is generally small (such as 470MHz-510MHz), which means that the analog filter needs to work accurately in a very limited frequency range, effectively filtering out-of-band noise and interference, and ensuring the integrity of the in-band signal. The filtering effect of the analog filter on the wireless analog signal directly affects whether the subsequent demodulation can be normal: on the one hand, if the analog filter performance is poor, some subcarrier signals may be excessively attenuated, thereby reducing the signal-to-noise ratio of the signal and affecting the decoding ability of the receiving end; on the other hand, if the center frequency of the analog filter is slightly deviated, even a small offset, it will cause the received signal to shift in the frequency domain. This offset will cause the frequencies between the subcarriers to no longer maintain a strict orthogonal relationship, that is, it may cause the orthogonality between the subcarriers to be damaged, causing inter-subcarrier interference (ICI), further increasing the noise level and causing signal distortion. Summary of the invention

[0004] In view of this, an embodiment of the present application provides a method and device for configuring an analog filter in an OFDM communication system to solve at least one problem existing in the background technology.

[0005] In a first aspect, an embodiment of the present application provides a method for configuring an analog filter in an OFDM communication system, the method comprising: Acquire an analog signal, wherein the analog signal includes a target signal; Configuring parameters for the analog filter so that the center frequency of the analog filter is shifted from left to right; Filtering the analog signal based on the analog filter after the configuration parameters to obtain a filtered analog signal corresponding to each configuration parameter; Based on the filtered analog signal corresponding to each configuration parameter, the signal energy of the preset monitoring frequency corresponding to each configuration parameter is obtained; wherein the preset monitoring frequency includes a first frequency, a second frequency and a third frequency, the first frequency is the same as the center frequency of the target signal; the second frequency and the third frequency are symmetrical with respect to the first frequency; Based on the signal energy of the preset monitoring frequency point corresponding to each configuration parameter, a first difference value corresponding to each configuration parameter is obtained; wherein the first difference value is an absolute value of the difference between the signal energy of the second frequency point and the signal energy of the third frequency point; The magnitudes of the first difference values ​​corresponding to each configuration parameter are compared, and the optimal parameters of the analog filter are determined based on the comparison results.

[0006] In a second aspect, an embodiment of the present application provides an analog filter configuration device in an OFDM communication system, the device comprising: An acquisition unit, configured to acquire an analog signal, wherein the analog signal includes a target signal; A parameter configuration unit, used to configure parameters of the analog filter so that the center frequency of the analog filter is shifted from left to right; A filtering unit, configured to filter the analog signal based on the analog filter after the configuration parameters, to obtain a filtered analog signal corresponding to each configuration parameter; A frequency monitoring unit, configured to obtain the signal energy of a preset monitoring frequency corresponding to each configuration parameter based on the filtered analog signal corresponding to each configuration parameter; wherein the preset monitoring frequency includes a first frequency, a second frequency and a third frequency, the first frequency is the same as the center frequency of the target signal; the second frequency and the third frequency are symmetrical with respect to the first frequency; A monitoring frequency calculation unit, configured to obtain a first difference value corresponding to each configuration parameter based on the signal energy of the preset monitoring frequency point corresponding to each configuration parameter; wherein the first difference value is an absolute value of the difference between the signal energy of the second frequency point and the signal energy of the third frequency point; The parameter determination unit is used to compare the size of the first difference corresponding to each configuration parameter, and determine the optimal parameter of the analog filter based on the comparison result.

[0007] In a third aspect, an embodiment of the present application provides a computer-readable storage medium, which stores instructions. When the instructions are executed by a processor of an electronic device, the electronic device can execute the analog filter configuration method in the OFDM communication system provided in any one of the first aspects above.

[0008] In a fourth aspect, an embodiment of the present application provides an electronic device, the electronic device comprising: processor; memory for storing computer executable instructions; The processor is used to execute the computer executable instructions to implement the analog filter configuration method in the OFDM communication system described in any one of the first aspects above.

[0009] In the embodiment of the present application, the center frequency of the analog filter is shifted from left to right by configuring the parameters of the analog filter, and then the analog signal is filtered under each configuration parameter, and then the filtered signal energy of the corresponding frequency point is obtained at the preset monitoring frequency point, and the optimal parameters of the analog filter are finally determined by the relative size of the signal energy of the preset monitoring frequency point. In the embodiment of the present application, the optimal parameters of the analog filter are determined by the signal energy of the preset monitoring frequency point, so that the center frequency of the analog filter is aligned with the center frequency of the target signal, so that the frequency components corresponding to the interference signal can be effectively filtered out, thereby improving the receiving performance of the receiver.

[0010] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings: Figure 1 A flow chart of a method for configuring an analog filter in an OFDM communication system applied to a radio frequency receiver provided in an embodiment of the present application; Figure 2 A schematic diagram of an analog filter configuration device in an OFDM communication system provided in one embodiment of the present application; Figure 3 A schematic diagram of the structure of an electronic device provided in one embodiment of the present application. DETAILED DESCRIPTION

[0012] In order to make the technical solutions and beneficial effects of the present invention more clearly understood, the following is a detailed description by listing specific embodiments. Unless otherwise defined, the technical and scientific terms used herein have the same meanings as those in the technical field to which this application belongs.

[0013] Figure 1 This is a flow chart of a method for configuring an analog filter in an OFDM communication system for a radio frequency receiver provided in an embodiment of the present application. Figure 1As shown, the analog filter configuration method of the embodiment of the present application includes: S1. Obtain analog signal.

[0014] The analog signal includes a target signal.

[0015] In one embodiment of the present application, the analog signal obtained refers to an intermediate frequency signal after being processed by a mixer, etc. Specifically, the receiving end receives a high-frequency analog signal, and the high-frequency analog signal becomes an intermediate frequency signal after being processed by a mixer, an amplifier, etc., so that subsequent filtering, amplification, and demodulation operations are easier to implement. In an embodiment of the present application, the analog signal includes a target signal. It should be noted that the analog signal includes not only the target signal, but may also include noise and other interference signals; wherein the target signal refers to a useful signal for transmitting information. During the signal transmission process, the transmitting end and the receiving end will follow the same power grid communication protocol and standard. Therefore, the center frequency, bandwidth, waveform and other key parameters of the target signal are known, so that in the subsequent filtering and amplification processes, the appropriate filter parameters can be selected according to the known bandwidth and frequency range of the target signal to ensure that the target signal can be effectively extracted. It can be understood that the mixing process is to transform the high-frequency analog signal into an intermediate frequency signal that is more suitable for processing. Therefore, on the one hand, high-frequency interference or high-frequency noise will also be transformed into the intermediate frequency domain, but on the other hand, due to the nonlinear characteristics of the mixer, the mixing process is not equivalent to the filtering process. Therefore, the intermediate frequency signal after mixing may still contain high-frequency components or other frequency components, which can be filtered out or reduced by subsequent analog filter filtering. It should be noted that, according to the power grid communication protocol, the waveform of the intermediate frequency signal in the embodiment of the present application is a sine waveform, and its center frequency has a high signal strength; in addition, ideally, the spectrum signal of the intermediate frequency signal is symmetrical about the center frequency, that is, on both sides of the center frequency, the signal strength of the same frequency offset should be equal (or approximately equal, taking into account the non-ideal factors in the actual circuit). This symmetry helps to ensure that the filter processes the signal uniformly within the passband range, thereby avoiding signal distortion or decreased frequency selectivity.

[0016] S2. Configure parameters of the analog filter so that the center frequency of the analog filter is shifted from left to right.

[0017] In the embodiment of the present application, the analog filter is a bandpass filter, which can selectively transmit signals within the required frequency range and attenuate or filter out signals in other frequency ranges. In an idealized receiver design, the center frequency and bandwidth of the analog filter are precisely matched to the target signal to ensure efficient reception and processing of the signal. Optionally, the bandwidth of the analog filter is equal to the bandwidth of the target signal. In the actual communication process, due to the influence of various factors, especially the deviation of the chip process, the performance parameters of the analog filter cannot reach the theoretical ideal state. Specifically, the center frequency of the analog filter will have a certain deviation from the center frequency of the target signal. If this deviation is not calibrated, it will cause the effective signal strength to be reduced or even filtered out, thereby directly affecting the receiving performance of the receiver. In the embodiment of the present application, the center frequency of the analog filter is adjusted by configuring the parameters of the analog filter, and then the parameters are judged whether they are accurate by the filtering effect. As an optional specific implementation, the analog filter is an adjustable static filter. Specifically, the analog filter uses a tunable element to achieve fine-tuning of the filtering parameters. Among them, the tunable element includes a variable capacitor, a variable inductor, and a variable resistor. Optionally, the tunable element is a variable capacitor, the adjustable capacitance value range is 64-192, the variable capacitor value is modulated from small to large, and correspondingly, the center frequency of the analog filter is shifted from left to right. In the embodiment of the present application, the range and number of configuration parameters of the analog filter are determined according to the actual communication situation, and the present application does not limit it.

[0018] It should be noted that filters are divided into static filters and dynamic filters based on whether their filtering characteristics are adjustable. A static filter usually refers to a filter whose filtering characteristics do not change over time; a dynamic filter is a filter that can adaptively adjust filtering parameters based on the characteristics of the input signal, and can adapt to different signals or system conditions by adjusting parameters in real time; in practical applications, static filters can also have a certain adjustable range, allowing fine-tuning of certain parameters within a certain range; static filters are simple to design, and due to their stable filtering parameters and characteristics, their filtering effects are more stable and can maintain relatively consistent filtering performance for a long time; dynamic filters are more complex to design and implement, but have higher flexibility and adaptability.

[0019] As an optional specific implementation, before configuring the parameters of the analog filter, the method further includes: The analog filter is initialized so that the analog filter selects initial parameters corresponding to the center frequency of the target signal.

[0020] Specifically, according to the communication protocol, the analog filter may filter the analog signal corresponding to the target signal of different center frequencies, and through initialization, the initial parameters of the analog filter can be matched with the target signal. It should be noted that the center frequency corresponding to the initial parameters of the analog filter matches the center frequency of the target signal, that is, they are equal in theory, but in reality there will be deviations. The present application is initialized, so that matching initialization parameters can be selected to facilitate the subsequent fine-tuning of the center frequency. For example, if the center frequency of the target signal is 1MHz, the corresponding center frequency of the analog filter after initialization is also close to 1MHz, so that the center frequencies of the two can be made to overlap as much as possible by fine-tuning the analog filter parameters. It should be noted that the initialization parameters include parameters such as the initial capacitance value and the initial bandwidth.

[0021] S3. Filter the analog signal based on the analog filter after the configuration parameters to obtain the filtered analog signal corresponding to each configuration parameter.

[0022] Specifically, the same analog signal is filtered by analog filters with different configuration parameters to obtain a filtered analog signal corresponding to each configuration parameter.

[0023] S4. Based on the filtered analog signal corresponding to each configuration parameter, obtain the signal energy of the preset monitoring frequency point corresponding to each configuration parameter.

[0024] In the embodiment of the present application, the preset monitoring frequency includes a first frequency, a second frequency and a third frequency, wherein the first frequency is the same as the center frequency of the target signal; the second frequency and the third frequency are symmetrical relative to the first frequency, that is, the second frequency is on the left of the first frequency, the third frequency is on the right of the first frequency, and the frequency difference between the first frequency and the second frequency is equal to the frequency difference between the third frequency and the first frequency. In the embodiment of the present application, by setting the preset monitoring frequency, the signal energy (i.e., signal strength value) of the filtered analog signal corresponding to each configuration parameter at the preset monitoring frequency can be obtained, so that the filtering effect of the filter after each configuration parameter can be easily evaluated. It should be noted that the first frequency and the second frequency are both within the passband range of the analog filter. The passband refers to the frequency range in which the filter allows the signal to pass, and the bandwidth refers to the broadband of the frequency range, i.e., the difference between the two cutoff frequencies. In an embodiment of the present application, if the center frequency of the analog filter coincides with the center frequency of the target signal, the passband of the analog filter coincides with the passband of the target signal, thereby effectively filtering out unnecessary frequency components; if the center frequency of the analog filter deviates from the center frequency of the target signal, the passband of the analog filter partially coincides with the passband of the target signal, which not only causes some noise signals to fail to be effectively filtered out, but also affects the strength of some useful signals. The greater the deviation, the greater the impact.

[0025] S5. Obtain a first difference value corresponding to each configuration parameter based on the signal energy of the preset monitoring frequency point corresponding to each configuration parameter.

[0026] Among them, the first difference is the absolute value of the difference between the signal energy of the second frequency point and the signal energy of the third frequency point. In the embodiment of the present application, the size of the first difference represents the relative size of the signal energy of the filtered analog signal corresponding to each configuration parameter at the second frequency point and the third frequency point. The smaller the deviation between the center frequency of the analog filter and the center frequency of the target signal, the smaller the corresponding first difference, so that the optimal parameters of the analog filter can be determined by the first difference.

[0027] S6. Compare the sizes of the first difference values ​​corresponding to each configuration parameter, and determine the optimal parameters of the analog filter based on the comparison results.

[0028] Specifically, S6 includes: The sizes of the first differences corresponding to each configuration parameter are compared to obtain a minimum value of the first differences, and the configuration parameter corresponding to the minimum value of the first difference is the optimal parameter of the filter.

[0029] In the embodiment of the present application, the optimal parameters of the filter are the calibration parameters of the filter. Specifically, the first difference reflects the difference in signal strength between the second frequency point and the third frequency point of the filtered analog signal. When the first difference is the minimum, it indicates that the signal strengths of the second frequency point and the third frequency point are closer. Based on the principle that the waveform of the target signal is a sine waveform and the signal strengths of other frequency points in the target signal are symmetrical relative to the first frequency point, the center frequency of the analog filter and the center frequency of the target signal are aligned at this time, so that the configuration parameters corresponding to the minimum value of the first difference can be determined as the optimal parameters of the filter. It should be noted that in an actual communication environment, the target signal is affected by noise signals, etc., and the signal strengths of the second frequency point and the third frequency point are not completely equal. Therefore, when the difference in signal strength between the two is the smallest, it can be determined that the center frequency of the analog filter and the center frequency of the target signal are aligned at this time.

[0030] In the embodiment of the present application, the center frequency of the analog filter is shifted from left to right by configuring the parameters of the analog filter, and then the analog signal is filtered under each configuration parameter, and then the filtered signal energy of the corresponding frequency point is obtained at the preset monitoring frequency point, and the optimal parameters of the analog filter are finally determined by the relative size of the signal energy of the preset monitoring frequency point. In the embodiment of the present application, the optimal parameters of the analog filter are determined by the signal energy of the preset monitoring frequency point, so that the center frequency of the analog filter is aligned with the center frequency of the target signal, so that the frequency components corresponding to the interference signal can be effectively filtered out, thereby improving the receiving performance of the receiver.

[0031] As an optional specific implementation, S6 further includes: Compare the magnitudes of the first differences corresponding to each configuration parameter to obtain the minimum value of the first differences; If the signal energies of the second frequency point and the third frequency point corresponding to the minimum value of the first differences are both less than the signal energy of the first frequency point, then the configuration parameter corresponding to the minimum value of the first differences is the optimal parameter of the filter.

[0032] In the embodiments of the present application, by comparing the first differences under different configuration parameters and finding their minimum values, the configuration parameter with the center frequency of the filter closest to the center frequency of the target signal can be determined. At this time, the signal energies of the second frequency point and the third frequency point are both less than the signal energy of the first frequency point, further verifying that the configuration parameter corresponding to the minimum value of the first differences is the optimal parameter of the filter. In the embodiments of the present application, the center frequency of the analog filter is translated from left to right to adjust the center frequency of the filter from small to large within a certain range, so as to judge the filtering effect of the filter at each center frequency. Through the comparison of the minimum value of the first differences and the further comparison of the signal energies of the preset monitoring frequency points, the optimal configuration parameter can be obtained more accurately, realizing the calibration of the center frequency of the analog filter.

[0033] To more clearly illustrate the technical solution of the embodiments of the present application, take a 1 MHz intermediate frequency signal as an example: Set three monitoring frequency points f0, f1, f2, where f1 is the center frequency point of the intermediate frequency signal, that is, f1 = 1 MHz, f0 is 300 KHz to the left of f1, that is, f0 = 1M - 300K, and f2 is 300 KHz to the right of f1, that is, f2 = 1M + 300K; By configuring the parameters of the analog filter, the center frequency of the analog filter is translated from left to right. Under each configuration parameter, the signal energies corresponding to the three frequency points f0, f1, and f2 can be obtained, corresponding to rms0, rms1, and rms2 respectively; When the first parameter is used, calculate the difference between rms0 and rms2, then take the absolute value of the difference rms_diff, and assign rms_diff0 to min_diff; When the second parameter is used, calculate the difference between rms0 and rms2, then take the absolute value of the difference rms_diff1. When rms_diff1 is less than min_diff, assign rms_diff1 to min_diff and update the value of min_diff. When rms_diff1 is greater than or equal to min_diff, min_diff remains unchanged; And so on until the last parameter. In this loop operation process, the parameter corresponding to the minimum value min_diff will be found. At the same time, when rms0 < rms1 and rms2 < rms1 are satisfied under the condition of this parameter, then this parameter is the optimal parameter of the intermediate frequency filter, that is, the center frequency point of the intermediate frequency filter is aligned with the center frequency of the intermediate frequency signal.

[0034] It should be understood that although Figure 1 The steps in the flowchart are shown in sequence as indicated by the arrows, but these steps are not necessarily executed in the order indicated by the arrows. Unless otherwise specified in this document, there is no strict order restriction for the execution of these steps, and these steps can be executed in other orders. Moreover, Figure 1 At least part of the steps may include multiple steps or multiple stages. These steps or stages are not necessarily performed at the same time, but can be performed at different times. The execution order of these steps or stages is not necessarily sequential, but can be performed in turn or alternately with other steps or at least part of the steps or stages in other steps.

[0035] Figure 2 Schematic diagram of an analog filter configuration device in an OFDM communication system provided by an embodiment of the present application. Figure 2 As shown, the analog filter configuration device 200 of the embodiment of the present application includes: An acquisition unit 201 is used to acquire an analog signal, where the analog signal includes a target signal; A parameter configuration unit 202, configured to configure parameters of the analog filter so that the center frequency of the analog filter is shifted from left to right; A filtering unit 203, configured to filter the analog signal based on the analog filter after the configuration parameters, to obtain a filtered analog signal corresponding to each configuration parameter; The frequency monitoring unit 204 is used to obtain the signal energy of the preset monitoring frequency corresponding to each configuration parameter based on the filtered analog signal corresponding to each configuration parameter; wherein the preset monitoring frequency includes a first frequency, a second frequency and a third frequency, the first frequency is the same as the center frequency of the target signal; the second frequency and the third frequency are symmetrical with respect to the first frequency; The monitoring frequency calculation unit 205 is used to obtain a first difference value corresponding to each configuration parameter based on the signal energy of the preset monitoring frequency point corresponding to each configuration parameter; wherein the first difference value is the absolute value of the difference between the signal energy of the first frequency point and the signal energy of the second frequency point; The parameter determination unit 206 is used to compare the size of the first difference corresponding to each configuration parameter, and determine the optimal parameters of the analog filter based on the comparison result.

[0036] Optionally, the analog filter is an adjustable static filter.

[0037] Optionally, the analog filter is a bandpass filter, and the bandwidth of the bandpass filter is equal to the bandwidth of the target signal.

[0038] Optionally, the analog filter configuration device 200 further includes: The initialization unit is used to initialize the analog filter so that the analog filter selects initial parameters corresponding to the center frequency of the target signal.

[0039] Optionally, comparing the magnitude of the first difference corresponding to each configuration parameter, and determining the optimal parameters of the analog filter based on the comparison result, includes: The sizes of the first differences corresponding to each configuration parameter are compared to obtain a minimum value of the first differences, and the configuration parameter corresponding to the minimum value of the first difference is the optimal parameter of the filter.

[0040] Optionally, comparing the magnitude of the first difference corresponding to each configuration parameter, and determining the optimal parameters of the analog filter based on the comparison result, includes: Compare the first difference values ​​corresponding to each configuration parameter to obtain the minimum value of the first difference values; If the signal energy of the second frequency point and the signal energy of the third frequency point corresponding to the minimum value of the first difference are both smaller than the signal energy of the first frequency point, the configuration parameter corresponding to the minimum value of the first difference is the optimal parameter of the filter.

[0041] The embodiment of the present application also provides a computer-readable storage medium. The computer-readable storage medium stores instructions, and when the instructions are executed by a processor of an electronic device, the electronic device can execute the steps in the analog filter configuration method in an OFDM communication system of any of the above embodiments.

[0042] The embodiments of the present application may be systems, methods and / or computer program products. The computer program product may include a computer-readable storage medium on which computer-readable program instructions are loaded for causing a processor to implement various aspects of the present application. In some embodiments, by using the state information of the computer-readable program instructions to personalize an electronic circuit, such as a programmable logic circuit, a field programmable gate array (FPGA) or a programmable logic array (PLA), the electronic circuit may execute the computer-readable program instructions to implement various aspects of the present application.

[0043] Computer readable storage medium can adopt any combination of one or more readable media. The readable medium can be a readable signal medium or a readable storage medium. Computer readable storage medium is a tangible device that can keep and store instructions used by an instruction execution device. The readable storage medium can include, for example, but is not limited to, a system, device or device of electricity, magnetism, light, electromagnetic, infrared, or semiconductor, or any combination of the above. More specific examples (non-exhaustive list) of readable storage medium include: portable computer disk, hard disk, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), static random access memory (SRAM), portable compact disk read-only memory (CD-ROM), digital versatile disk (DVD), memory stick, floppy disk, mechanical encoding device, such as a punch card or a protruding structure in a groove on which instructions are stored, and any suitable combination of the above.

[0044] Various aspects of the present application are described herein with reference to flowcharts and / or block diagrams of methods, devices (systems) and computer program products according to embodiments of the present application. It should be understood that each box in the flowchart and / or block diagram and the combination of boxes in the flowchart and / or block diagram can be implemented by computer-readable program instructions.

[0045] An embodiment of the present application also provides an electronic device. Figure 3 The structure diagram of an electronic device provided by an embodiment of the present application is shown. As shown in the figure, the electronic device 300 includes: one or more processors 301 and a memory 302; the memory 302 stores computer executable instructions; the processor 301 is used to execute the computer executable instructions to implement the steps in the analog filter configuration method in the OFDM communication system as in any of the above embodiments.

[0046] The processor 301 may be a central processing unit (CPU) or other forms of processing units having data processing capabilities and / or instruction execution capabilities, and may control other components in the electronic device to perform desired functions.

[0047] The memory 302 may include one or more computer program products, and the computer program products may include various forms of computer-readable storage media, such as volatile memory and / or non-volatile memory. Volatile memory may include, for example, random access memory (RAM) and / or cache memory (cache), etc. Non-volatile memory may include, for example, read-only memory (ROM), hard disk, flash memory, etc. One or more computer program instructions may be stored on the computer-readable storage medium, and the processor 301 may execute the program instructions to implement the steps in the text recognition method of each embodiment of the present application described above and / or other desired functions.

[0048] In one example, the electronic device 300 may further include: an input device and an output device, and these components are interconnected via a bus system and / or other forms of connection mechanisms (not shown in the figure).

[0049] In addition, the input device may also include, for example, a keyboard, a mouse, a microphone, etc. The output device may output various information to the outside, and may include, for example, a display, a speaker, a printer, a communication network and a remote output device connected thereto, and the like.

[0050] Of course, to simplify, Figure 3 Only a part of the components related to the present application in the electronic device 300 is shown, and components such as a bus, an input device / output interface, etc. are omitted. In addition, according to specific application conditions, the electronic device 300 may also include any other appropriate components.

[0051] It should be noted that the embodiments of the analog filter configuration method in the OFDM communication system, the analog filter configuration device in the OFDM communication system, the computer-readable storage medium and the electronic device provided in the embodiments of the present application belong to the same concept; the technical features in the technical solutions recorded in each embodiment can be arbitrarily combined without conflict.

[0052] It should be understood that the above embodiments are exemplary and are not intended to include all possible implementations included in the claims. Various modifications and changes may be made on the basis of the above embodiments without departing from the scope of the present disclosure. Similarly, the various technical features of the above embodiments may be arbitrarily combined to form other embodiments of the present invention that may not be explicitly described. Therefore, the above embodiments only express several implementations of the present invention and do not limit the scope of protection of the patent of the present invention.

Claims

1. A method for configuring an analog filter in an OFDM communication system, applied to a radio frequency receiver, characterized in that: The method comprises: Acquire an analog signal, wherein the analog signal includes a target signal; Configuring parameters for the analog filter so that the center frequency of the analog filter is shifted from left to right; Filtering the analog signal based on the analog filter after the configuration parameters to obtain a filtered analog signal corresponding to each configuration parameter; Based on the filtered analog signal corresponding to each configuration parameter, the signal energy of the preset monitoring frequency corresponding to each configuration parameter is obtained; wherein the preset monitoring frequency includes a first frequency, a second frequency and a third frequency, the first frequency is the same as the center frequency of the target signal; the second frequency and the third frequency are symmetrical with respect to the first frequency; Based on the signal energy of the preset monitoring frequency point corresponding to each configuration parameter, a first difference value corresponding to each configuration parameter is obtained; wherein the first difference value is an absolute value of the difference between the signal energy of the second frequency point and the signal energy of the third frequency point; The magnitudes of the first difference values ​​corresponding to each configuration parameter are compared, and the optimal parameters of the analog filter are determined based on the comparison results.

2. The analog filter configuration method in an OFDM communication system as claimed in claim 1, characterized in that: Comparing the magnitude of the first difference corresponding to each configuration parameter, and determining the optimal parameters of the analog filter based on the comparison result, comprises: The sizes of the first differences corresponding to each configuration parameter are compared to obtain a minimum value of the first differences; the configuration parameter corresponding to the minimum value of the first difference is the optimal parameter of the analog filter.

3. The analog filter configuration method in an OFDM communication system as claimed in claim 1, characterized in that: Comparing the magnitude of the first difference corresponding to each configuration parameter, and determining the optimal parameters of the analog filter based on the comparison result, comprises: Compare the first difference values ​​corresponding to each configuration parameter to obtain the minimum value of the first difference values; If the signal energy of the second frequency point and the signal energy of the third frequency point corresponding to the minimum value of the first difference are both smaller than the signal energy of the first frequency point, the configuration parameter corresponding to the minimum value of the first difference is the optimal parameter of the analog filter.

4. The analog filter configuration method in an OFDM communication system as claimed in claim 1, characterized in that: Before configuring the analog filter parameters, it also includes: The analog filter is initialized so that the analog filter selects initial parameters corresponding to the center frequency of the target signal.

5. The analog filter configuration method in an OFDM communication system according to claim 1, characterized in that: The analog filter is a bandpass filter, and the bandwidth of the bandpass filter is equal to the bandwidth of the target signal.

6. The analog filter configuration method in an OFDM communication system as claimed in claim 5, characterized in that: The analog filter is an adjustable static filter.

7. An analog filter configuration device in an OFDM communication system, characterized in that: The device comprises: An acquisition unit, configured to acquire an analog signal, wherein the analog signal includes a target signal; A parameter configuration unit, used to configure parameters of the analog filter so that the center frequency of the analog filter is shifted from left to right; A filtering unit, configured to filter the analog signal based on the analog filter after the configuration parameters, to obtain a filtered analog signal corresponding to each configuration parameter; A frequency monitoring unit, configured to obtain the signal energy of a preset monitoring frequency corresponding to each configuration parameter based on the filtered analog signal corresponding to each configuration parameter; wherein the preset monitoring frequency includes a first frequency, a second frequency and a third frequency, the first frequency is the same as the center frequency of the target signal; the second frequency and the third frequency are symmetrical with respect to the first frequency; A monitoring frequency calculation unit, configured to obtain a first difference value corresponding to each configuration parameter based on the signal energy of the preset monitoring frequency point corresponding to each configuration parameter; wherein the first difference value is an absolute value of the difference between the signal energy of the second frequency point and the signal energy of the third frequency point; The parameter determination unit is used to compare the size of the first difference corresponding to each configuration parameter, and determine the optimal parameter of the analog filter based on the comparison result.

8. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores instructions, and when the instructions are executed by a processor of an electronic device, the electronic device is enabled to execute the analog filter configuration method in an OFDM communication system as described in any one of claims 1 to 6.

9. An electronic device, characterized in that: The electronic device comprises: processor; memory for storing computer executable instructions; The processor is used to execute the computer executable instructions to implement the analog filter configuration method in the OFDM communication system as described in any one of claims 1 to 6.

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