CN115913373A - Input signal frequency spectrum detection method of digital optical fiber repeater - Google Patents
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Abstract
The invention discloses a method for detecting the frequency spectrum of an input signal of a digital optical fiber repeater, which comprises the steps of detecting and generating a data sequence of the amplitude of a frequency spectrum component by an FPGA chip to obtain the amplitude information of each frequency component; CPU software calculates and judges the effectiveness of the data sequence of the frequency spectrum component amplitude, converts the signal initial frequency and cut-off frequency, and judges the effectiveness of the signal initial frequency and cut-off frequency obtained by the detection in the previous round by combining the detection result; the near end unit CPU software detects and determines the validity of the start frequency and cut-off frequency of one or more signals, and then distributes the start frequency and cut-off frequency of the signals to the far end unit. By the technical scheme provided by the invention, the FPGA chip can only realize the fast Fourier transform of the input signal to generate the data sequence of the frequency spectrum component amplitude, thereby achieving the purpose of saving the logic resource of the FPGA chip.
Description
Technical Field
The invention belongs to the technical field of wireless communication, and particularly relates to a method for detecting the frequency spectrum of an input signal of a digital optical fiber repeater.
Background
In the current wireless communication system, multiple systems, multiple channels and multiple frequency bands coexist in the similar frequency bands. The digital optical fiber repeater is used as a relay remote amplification device of a wireless signal, and different signals need to be subjected to digital algorithm processing such as different filtering and the like so as to reduce interference between adjacent signals and reduce distortion in the relay process of the wireless signal. Before the digital algorithm such as filtering, the frequency spectrum of the input radio frequency signal needs to be accurately detected, and a reasonable digital filter can be selected according to the frequency spectrum to adjust the filter parameters.
In the implementation process, the inventor finds that in the conventional technology, usually, only an FPGA chip is used, and a Fast Fourier Transform (FFT) algorithm is used to detect the amplitude of each frequency component to detect the signal spectrum, and other algorithm parameters and actions are controlled according to the detection result.
This method has at least the following problems:
1. the FPGA chip occupies more resources. After the FFT algorithm processing is performed on the signal, a large amount of data representing the amplitude of the spectral component is generated, and the calculation and processing of the data occupy more resources on the FPGA chip.
2. The digital optical fiber repeater is composed of a near-end unit and a far-end unit, wireless signals are input from the near-end unit and output from the far-end unit, and spectrum detection result data of an FPGA chip of the near-end unit are inconvenient to transmit to the far end.
3. The input signal of the digital optical fiber repeater comes from the antenna interface of the base station and varies with the number of terminals, the distance and the service of the terminals. If the instantaneous detection result is taken as the judgment basis, the possibility of misjudgment exists, thereby causing malfunction.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a method for detecting the frequency spectrum of an input signal of a digital optical fiber repeater, which comprises the following steps:
step one, after analog-to-digital conversion is carried out on a radio frequency signal input into a digital optical fiber repeater, a digital signal representing the radio frequency signal is input into an FPGA chip, and the FPGA chip detects the amplitude of each frequency component by using a fast Fourier transform algorithm to generate a data sequence of the amplitude of a frequency spectrum component;
after the FPGA chip finishes the detection of the frequency spectrum component amplitude, the FPGA chip sends a signal to inform the CPU chip of finishing the detection of the frequency spectrum component amplitude, the CPU chip reads an amplitude detection data sequence through a communication interface between the CPU chip and the FPGA chip, calculates and judges reference values of the initial frequency and the cut-off frequency of the frequency spectrum, compares the data of the data sequence of the frequency spectrum component amplitude one by one, converts the initial frequency and the cut-off frequency of the frequency spectrum, and judges the initial frequency, the cut-off frequency and the effectiveness;
and step three, after the near-end unit finishes the input signal frequency spectrum detection and the frequency spectrum data validity judgment, the initial frequency and the cut-off frequency of the signal are sent to the far-end unit through a monitoring communication channel between the near-end unit and the far-end unit, and the far-end unit selects a corresponding filter according to the initial frequency and the cut-off frequency of one or more signals, sets corresponding filter parameters and finishes the input signal frequency spectrum detection of the repeater.
Further, after performing analog-to-digital conversion on the radio frequency signal input to the digital optical fiber repeater, the digital signal representing the radio frequency signal is input to the FPGA chip, and the FPGA chip detects the amplitude of each frequency component by using a fast fourier transform algorithm to generate a data sequence of the amplitude of the frequency spectrum component, including:
in the nominal working frequency band of the digital optical fiber repeater, the digital optical fiber repeater is averagely divided into a plurality of small frequency components at the same frequency interval according to the requirement of frequency spectrum detection precision; the FPGA chip detects the amplitude of each frequency component one by one from the lowest frequency to the highest frequency by using a fast Fourier transform algorithm to obtain a data sequence of the frequency spectrum component amplitude; in unit time, scanning and detecting the frequency component amplitude in the working frequency band for multiple times, and accumulating the detection results of corresponding frequencies; and after the detection is finished, storing the detection result data in a corresponding register, sending a signal to inform a CPU of the readiness of detection data, and after the CPU reads the amplitude detection data, carrying out the amplitude detection of the frequency spectrum component of the next round.
Further, after the FPGA chip completes the detection of the amplitude of the frequency spectrum component, the FPGA chip sends a signal to notify the CPU chip that the detection of the amplitude of the frequency spectrum component is completed, the CPU chip reads the amplitude detection data sequence through a communication interface with the FPGA chip, calculates reference values for determining the start frequency and the cutoff frequency of the frequency spectrum, compares data of the data sequence of the amplitude of the frequency spectrum component one by one, converts the start frequency and the cutoff frequency of the frequency spectrum, and determines the start frequency, the cutoff frequency and the effectiveness, including the following steps:
finding a maximum amplitude value from the spectral component amplitude data sequence; taking 10% of the maximum amplitude value as an amplitude level reference value; sequentially comparing the frequency spectrum component amplitude data sequence with a reference amplitude level, wherein if the frequency spectrum component amplitude data sequence reaches the reference amplitude level, the frequency spectrum component is an effective frequency spectrum component, and if the frequency spectrum component is lower than the reference amplitude level, the frequency spectrum component is an ineffective frequency spectrum component, and in the frequency spectrum component amplitude data sequence, the initial frequency and the cut-off frequency corresponding to the effective frequency spectrum component are the initial frequency and the cut-off frequency of the frequency spectrum of the input signal; and comparing the initial frequency with the cut-off frequency detected in the previous round, if the initial frequency is the same as the cut-off frequency, judging that the initial frequency and the cut-off frequency of the signal are valid, and if the initial frequency and the cut-off frequency are different from the cut-off frequency, judging that the initial frequency and the cut-off frequency of the signal are invalid.
Further, the step of judging the validity of the phase information includes:
firstly, an FPGA chip uses a Fast Fourier Transform (FFT) algorithm to detect the amplitude of each frequency component one by one from the lowest frequency component to the highest frequency component so as to generate a data sequence of the frequency spectrum component amplitude;
then, in unit time, the FPGA chip scans and detects the frequency component amplitude in the working frequency band for multiple times, and accumulates the detection results of the corresponding frequency amplitude;
and finally, the FPGA chip stores the data sequence of the spectral component amplitude in a corresponding register, sends a signal to inform a CPU of the readiness of detection data, and performs the next round of spectral component amplitude detection after the CPU reads the amplitude detection data.
Further, the step of judging the validity of the feedback amplitude information specifically includes:
the amplitude detection data sequence is read. The CPU core reads the data series into a CPU memory through a data communication interface with the FPGA chip;
calculating a frequency spectrum judgment reference; CPU software compares the frequency spectrum component amplitude data sequence one by one to find out the maximum value in the data sequence, and takes 10% of the maximum value as the reference value for frequency spectrum judgment;
calculating a signal starting frequency and a cut-off frequency; CPU software compares the frequency spectrum component amplitude data sequence one by one, wherein the amplitude data which is greater than or equal to the reference value is an effective value, and the amplitude data which is smaller than the reference value is an invalid value; the initial frequency and the cut-off frequency corresponding to the effective frequency spectrum component are the initial frequency and the cut-off frequency of the frequency spectrum of the input signal;
calculating an initial frequency difference and a cutoff frequency difference; CPU software compares the initial frequency calculated by the current detection with the initial frequency calculated by the previous detection to calculate the initial frequency difference; comparing the cut-off frequency calculated by the current detection with the cut-off frequency calculated by the previous detection, and calculating the cut-off frequency difference;
judging the effectiveness of the signal frequency spectrum; judging whether the initial frequency difference and the cutoff frequency difference are larger than 2 times of the frequency interval of the fast Fourier transform, if so, the frequency spectrum detection result of the current round is invalid; if the frequency spectrum is smaller than the preset frequency spectrum, the frequency spectrum detection result is valid; the CPU saves the start frequency and the cut-off frequency for calculating the start frequency difference and the end frequency difference in the next round of detection.
The invention has the beneficial effects that: the FPGA chip only realizes the fast Fourier transform of the input signal to generate a data sequence of the frequency spectrum component amplitude value, thereby achieving the purpose of saving the logic resource of the FPGA chip; the CPU chip is used, the data sequence of the frequency spectrum component amplitude is further calculated and processed by a software algorithm, the corresponding initial frequency and cut-off frequency are calculated, the validity of the result is judged, the detection is accurate, and the misoperation is prevented; the CPU chip distributes the data of the initial frequency and the cut-off frequency of the input signal between the near-end unit and the far-end unit through the system monitoring communication link, and instructs the near-end unit and the far-end unit to coordinate actions.
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Fig. 1 is a schematic flow chart of a method for detecting a spectrum of an input signal of a digital optical fiber repeater.
Detailed Description
The technical solutions of the present invention are further described in detail below with reference to the accompanying drawings, but the scope of the present invention is not limited to the following descriptions.
For the purpose of making the object, technical solution and advantages of the present invention more apparent, the present invention will be further described in detail with reference to the accompanying drawings and embodiments. It should be understood that the detailed description and specific examples, while indicating the preferred embodiment of the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention. It is noted that relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions.
Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrases "comprising a" \8230; "does not exclude the presence of additional like elements in the process, method, article, or apparatus that comprises the element.
The features and properties of the present invention are described in further detail below with reference to examples.
As shown in fig. 1, a method for detecting a spectrum of an input signal of a digital optical fiber repeater includes the following steps:
step one, after analog-to-digital conversion is carried out on a radio frequency signal input into a digital optical fiber repeater, a digital signal representing the radio frequency signal is input into an FPGA chip, and the FPGA chip detects the amplitude of each frequency component by using a fast Fourier transform algorithm to generate a data sequence of the amplitude of a frequency spectrum component;
after the FPGA chip finishes the detection of the frequency spectrum component amplitude, the FPGA chip sends a signal to inform the CPU chip of finishing the detection of the frequency spectrum component amplitude, the CPU chip reads an amplitude detection data sequence through a communication interface between the CPU chip and the FPGA chip, calculates and judges reference values of the initial frequency and the cut-off frequency of the frequency spectrum, compares the data of the data sequence of the frequency spectrum component amplitude one by one, converts the initial frequency and the cut-off frequency of the frequency spectrum, and judges the initial frequency, the cut-off frequency and the effectiveness;
and step three, after the near-end unit completes the input signal frequency spectrum detection and the frequency spectrum data validity judgment, the initial frequency and the cut-off frequency of the signal are sent to the far-end unit through a monitoring communication channel between the near-end unit and the far-end unit, and the far-end unit selects a corresponding filter according to the initial frequency and the cut-off frequency of one or more signals, sets corresponding filter parameters and completes the input signal frequency spectrum detection of the repeater.
After analog-to-digital conversion is carried out on the radio-frequency signal input into the digital optical fiber repeater, the digital signal representing the radio-frequency signal is input into an FPGA chip, the FPGA chip detects the amplitude of each frequency component by using a fast Fourier transform algorithm to generate a data sequence of the amplitude of the frequency spectrum component, and the method comprises the following steps:
in the nominal working frequency band of the digital optical fiber repeater, according to the requirement of frequency spectrum detection precision, the digital optical fiber repeater is averagely divided into a plurality of small frequency components at the same frequency interval; the FPGA chip detects the amplitude of each frequency component one by one from the lowest frequency to the highest frequency by using a fast Fourier transform algorithm to obtain a data sequence of the frequency spectrum component amplitude; in unit time, scanning and detecting the frequency component amplitude value in the working frequency band for multiple times, and accumulating the detection results of corresponding frequencies; and after the detection is finished, storing the detection result data in a corresponding register, sending a signal to inform a CPU of the readiness of detection data, and after the CPU reads the amplitude detection data, carrying out the frequency spectrum component amplitude detection of the next round.
After the FPGA chip finishes the detection of the frequency spectrum component amplitude, the FPGA chip sends a signal to inform the CPU chip of finishing the detection of the frequency spectrum component amplitude, the CPU chip reads an amplitude detection data sequence through a communication interface between the CPU chip and the FPGA chip, calculates and judges reference values of the frequency spectrum initial frequency and the cut-off frequency, compares the data of the data sequence of the frequency spectrum component amplitude one by one, converts the initial frequency and the cut-off frequency of the frequency spectrum, and judges the initial frequency, the cut-off frequency and the effectiveness, and the method comprises the following steps:
finding a maximum amplitude value from the spectral component amplitude data sequence; taking 10% of the maximum amplitude value as an amplitude level reference value; sequentially comparing the frequency spectrum component amplitude data sequence with a reference amplitude level, wherein the frequency spectrum component amplitude data sequence is an effective frequency spectrum component when reaching the reference amplitude level, and is an ineffective frequency spectrum component when being lower than the reference amplitude level, and the initial frequency and the cut-off frequency corresponding to the effective frequency spectrum component in the frequency spectrum component amplitude data sequence are the initial frequency and the cut-off frequency of the frequency spectrum of the input signal; and comparing the initial frequency with the cut-off frequency detected in the previous round, if the initial frequency is the same as the cut-off frequency, judging that the initial frequency and the cut-off frequency of the signal are valid, and if the initial frequency and the cut-off frequency are different from the cut-off frequency, judging that the initial frequency and the cut-off frequency of the signal are invalid.
The phase information validity judging step comprises the following steps:
firstly, using a Fast Fourier Transform (FFT) algorithm by an FPGA chip to detect the amplitude of each frequency component one by one from the lowest frequency component to the highest frequency component so as to generate a data sequence of the frequency spectrum component amplitude;
then, in unit time, the FPGA chip scans and detects the frequency component amplitude in the working frequency band for multiple times, and accumulates the detection results of the corresponding frequency amplitude;
and finally, the FPGA chip stores the data sequence of the spectral component amplitude in a corresponding register, sends a signal to inform a CPU of the readiness of detection data, and performs the next round of spectral component amplitude detection after the CPU reads the amplitude detection data.
The step of judging the effectiveness of the feedback amplitude information specifically comprises the following steps:
the read amplitude detection data sequence. The CPU core reads the data series into a CPU memory through a data communication interface with the FPGA chip;
calculating a frequency spectrum judgment reference; CPU software compares the frequency spectrum component amplitude data sequence one by one to find out the maximum value in the data sequence, and takes 10% of the maximum value as the reference value for frequency spectrum judgment;
calculating a signal starting frequency and a cut-off frequency; CPU software compares the frequency spectrum component amplitude data sequence one by one, wherein the amplitude data which is greater than or equal to the reference value is an effective value, and the amplitude data which is smaller than the reference value is an invalid value; the initial frequency and the cut-off frequency corresponding to the effective frequency spectrum component are the initial frequency and the cut-off frequency of the frequency spectrum of the input signal;
calculating an initial frequency difference and a cut-off frequency difference; the CPU software compares the initial frequency calculated by the current detection with the initial frequency calculated by the previous detection to calculate the initial frequency difference; comparing the cut-off frequency calculated by the current detection with the cut-off frequency calculated by the previous detection, and calculating the cut-off frequency difference;
judging the effectiveness of the signal frequency spectrum; judging whether the initial frequency difference and the cut-off frequency difference are larger than 2 times of the frequency interval of the fast Fourier transform, if so, the frequency spectrum detection result of the current round is invalid; if the frequency spectrum is smaller than the preset frequency spectrum, the frequency spectrum detection result is valid; the CPU saves the start frequency and the cut-off frequency for calculating the start frequency difference and the end frequency difference in the next round of detection.
The foregoing is illustrative of the preferred embodiments of the present invention, and it is to be understood that the invention is not limited to the precise form disclosed herein and is not to be construed as limited to the exclusion of other embodiments, and that various other combinations, modifications, and environments may be used and modifications may be made within the scope of the concepts described herein, either by the above teachings or the skill or knowledge of the relevant art. And that modifications and variations may be effected by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (5)
1. A method for detecting the frequency spectrum of an input signal of a digital optical fiber repeater is characterized by comprising the following steps:
step one, after analog-to-digital conversion is carried out on a radio frequency signal input into a digital optical fiber repeater, a digital signal representing the radio frequency signal is input into an FPGA chip, and the FPGA chip detects the amplitude of each frequency component by using a fast Fourier transform algorithm to generate a data sequence of the amplitude of a frequency spectrum component;
after the FPGA chip finishes the detection of the frequency spectrum component amplitude, the FPGA chip sends a signal to inform the CPU chip of finishing the detection of the frequency spectrum component amplitude, the CPU chip reads an amplitude detection data sequence through a communication interface between the CPU chip and the FPGA chip, calculates and judges reference values of the initial frequency and the cut-off frequency of the frequency spectrum, compares the data of the data sequence of the frequency spectrum component amplitude one by one, converts the initial frequency and the cut-off frequency of the frequency spectrum, and judges the initial frequency, the cut-off frequency and the effectiveness;
and step three, after the near-end unit completes the input signal frequency spectrum detection and the frequency spectrum data validity judgment, the initial frequency and the cut-off frequency of the signal are sent to the far-end unit through a monitoring communication channel between the near-end unit and the far-end unit, and the far-end unit selects a corresponding filter according to the initial frequency and the cut-off frequency of one or more signals, sets corresponding filter parameters and completes the input signal frequency spectrum detection of the repeater.
2. The method for detecting the frequency spectrum of the input signal of the digital optical fiber repeater according to claim 1, wherein the step of inputting the digital signal representing the radio frequency signal to the FPGA chip after the analog-to-digital conversion of the radio frequency signal input to the digital optical fiber repeater, wherein the FPGA chip detects the amplitude of each frequency component by using a fast fourier transform algorithm to generate a data sequence of the amplitude of the frequency spectrum component comprises the steps of:
in the nominal working frequency band of the digital optical fiber repeater, the digital optical fiber repeater is averagely divided into a plurality of small frequency components at the same frequency interval according to the requirement of frequency spectrum detection precision; the FPGA chip detects the amplitude of each frequency component one by one from the lowest frequency to the highest frequency by using a fast Fourier transform algorithm to obtain a data sequence of the frequency spectrum component amplitude; in unit time, scanning and detecting the frequency component amplitude in the working frequency band for multiple times, and accumulating the detection results of corresponding frequencies; and after the detection is finished, storing the detection result data in a corresponding register, sending a signal to inform a CPU of the readiness of detection data, and after the CPU reads the amplitude detection data, carrying out the amplitude detection of the frequency spectrum component of the next round.
3. The method for detecting the frequency spectrum of the input signal of the digital optical fiber repeater according to claim 1, wherein after the FPGA chip completes the detection of the amplitude of the frequency spectrum component, the FPGA chip sends a signal to notify the CPU chip that the detection of the amplitude of the frequency spectrum component is completed, the CPU chip reads an amplitude detection data sequence through a communication interface between the CPU chip and the FPGA chip, calculates reference values for judging the initial frequency and the cut-off frequency of the frequency spectrum, compares the data of the data sequence of the amplitude of the frequency spectrum component one by one, converts the initial frequency and the cut-off frequency of the frequency spectrum, and judges the initial frequency, the cut-off frequency and the effectiveness, comprising the following steps:
finding a maximum amplitude value from the frequency spectrum component amplitude data sequence; taking 10% of the maximum amplitude value as an amplitude level reference value; sequentially comparing the frequency spectrum component amplitude data sequence with a reference amplitude level, wherein if the frequency spectrum component amplitude data sequence reaches the reference amplitude level, the frequency spectrum component is an effective frequency spectrum component, and if the frequency spectrum component is lower than the reference amplitude level, the frequency spectrum component is an ineffective frequency spectrum component, and in the frequency spectrum component amplitude data sequence, the initial frequency and the cut-off frequency corresponding to the effective frequency spectrum component are the initial frequency and the cut-off frequency of the frequency spectrum of the input signal; and comparing the initial frequency and the cut-off frequency with the corresponding initial frequency and cut-off frequency detected in the previous round, if the initial frequency and the cut-off frequency are the same, judging that the initial frequency and the cut-off frequency of the signal are effective, and if the initial frequency and the cut-off frequency are different, judging that the initial frequency and the cut-off frequency of the signal are ineffective.
4. The method as claimed in claim 3, wherein the step of determining the validity of the phase information comprises:
firstly, an FPGA chip uses a Fast Fourier Transform (FFT) algorithm to detect the amplitude of each frequency component one by one from the lowest frequency component to the highest frequency component so as to generate a data sequence of the frequency spectrum component amplitude;
then, in unit time, the FPGA chip scans and detects the frequency component amplitude in the working frequency band for multiple times, and accumulates the detection results of the corresponding frequency amplitude;
and finally, the FPGA chip stores the data sequence of the spectral component amplitude in a corresponding register, sends a signal to inform a CPU of the readiness of detection data, and performs the next round of spectral component amplitude detection after the CPU reads the amplitude detection data.
5. The method for detecting the frequency spectrum of the input signal of the digital optical fiber repeater according to claim 2, wherein the step of judging the validity of the feedback amplitude information specifically comprises the steps of:
the read amplitude detection data sequence. The CPU core reads the data series into a CPU memory through a data communication interface with the FPGA chip;
calculating a frequency spectrum judgment reference; CPU software compares the frequency spectrum component amplitude data sequence one by one to find out the maximum value in the data sequence, and takes 10% of the maximum value as the reference value for frequency spectrum judgment;
calculating a signal starting frequency and a cut-off frequency; CPU software compares the frequency spectrum component amplitude data sequence one by one, wherein the amplitude data which is greater than or equal to the reference value is an effective value, and the amplitude data which is smaller than the reference value is an invalid value; the initial frequency and the cut-off frequency corresponding to the effective frequency spectrum component are the initial frequency and the cut-off frequency of the frequency spectrum of the input signal;
calculating an initial frequency difference and a cut-off frequency difference; the CPU software compares the initial frequency calculated by the current detection with the initial frequency calculated by the previous detection to calculate the initial frequency difference; comparing the cut-off frequency calculated by the current detection with the cut-off frequency calculated by the previous detection, and calculating the cut-off frequency difference;
judging the effectiveness of a signal frequency spectrum; judging whether the initial frequency difference and the cutoff frequency difference are larger than 2 times of the frequency interval of the fast Fourier transform, if so, the frequency spectrum detection result of the current round is invalid; if the frequency spectrum is smaller than the preset frequency spectrum, the frequency spectrum detection result of the current round is valid; the CPU saves the start frequency and the cut-off frequency for calculating the start frequency difference and the end frequency difference in the next round of detection.
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