CN112671484B - Real-time spectrum symbol filtering interference detection method and system based on 5GNR network synchronization - Google Patents

Abstract

The invention provides a real-time spectrum symbol filtering interference detection method and system based on 5GNR network synchronization. Through the combined use of an antenna unit, a radio frequency unit, a synchronization module, a central processing unit, a GPS Beidou module, a display controller and a symbol filter, Receive the input of the 5G NR network analog signal, the clock synchronization is quickly synchronized to the system frame start time of the 5G NR base station signal, and then the real-time spectrum data of the 5G NR network is output; after the data received through GPS and Beidou navigation are synchronized, the 5G base station signal is switched to Divide the spectrum into multiple symbol units and use the corresponding symbol filter for detection; separate the spectrum of different symbol units through the signal component symbol filtering processing algorithm to obtain the signal components and interference noise components of the 5G NR base station, and display the 5G NR network through the display controller. According to the detection result of the interference component, the present invention realizes the separation, extraction and detection of the 5G NR base station signal component and the interference signal component, and achieves the purpose of accurately measuring the interference signal.

Description

A real-time spectrum symbol filtering interference detection method and system based on 5GNR network synchronization

technical field

The present invention relates to the field of communication technologies, and in particular, to a method and system for real-time spectrum symbol filtering interference detection based on 5GNR network synchronization.

Background technique

The 5g network refers to the fifth-generation network in the development of mobile communication networks. Compared with the previous four-generation mobile networks, the 5g network shows more enhanced functions in the actual application process, and theoretically its transmission speed is It can reach tens of gigabytes per second, which is hundreds of times faster than 4G mobile networks. For the 5G network, it shows more obvious advantages and more powerful functions in the actual application process. The 5G network supports both TDD and FDD duplex mode, but the base station density of the 5G network is higher, and the network bandwidth also increases. As large as 100MHz, TDD has better spectrum flexibility compared with FDD duplex mode, making TDD technology the main choice for 5G network technology. With the advancement of 5G network, interference problems are unavoidable. TDD duplex 5G NR The network faces technical difficulties in troubleshooting network interference.

Most of the existing 5G NR interference screening technical solutions use traditional spectrum detection methods. Because the sampling rate cannot reach the minimum symbol time unit (4.46us-71.35us) of 5G, the interference signal component is submerged in the 100MHz 5G base station signal. Such a technology The interference signal cannot be clearly distinguished, and the direction finding and positioning of the interference signal cannot be carried out effectively.

Based on the above-mentioned series of problems, the following technical solutions are produced.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a real-time spectrum symbol filtering interference detection method and system based on 5GNR network synchronization, which realizes the separation, extraction and detection of 5G NR base station signal components and interference signal components, and achieves the purpose of accurately measuring interference signals.

For achieving the above object, the invention provides the following technical solutions:

The present invention provides a real-time spectrum symbol filtering interference detection method based on 5GNR network synchronization, the method includes the following steps:

S1. Receive the input of the 5G NR network analog signal, quickly synchronize to the system frame start time of the 5G NR base station signal through clock synchronization, synchronize with the 5G network wireless frame, and then output the 5G NR network real-time spectrum data;

S2. After the data received through GPS and Beidou Navigation are synchronized, the 5G base station signal is divided into multiple symbol unit spectrums and the corresponding symbol filter is used for detection;

S3. The signal components and interference noise components of the 5G NR base station are respectively obtained by applying the signal component symbol filtering processing algorithm to the spectrum of different symbol units, and the detection results of the interference components of the 5G NR network are displayed through the display controller.

Further, the clock synchronization process includes receiving an analog signal of a 5G base station and converting the analog signal into a digital signal, then outputting real-time spectrum data, and adding the converted spectrum data to an existing network variable, where the current network variable is 300us.

Further, the spectrum of the multiple symbol units includes 71.42us, 35.71us, 17.84us, 8.92us, and 4.46us, corresponding to the selection of No. 0 symbol filter detection, No. 1 symbol filter detection, No. 2 symbol filter detection, and No. 3 symbol filter detection. No. symbol filter detection, No. 4 symbol filter detection.

Further, the signal component symbol filtering processing algorithm includes a 5G NR base station signal component and an interference noise component, and the 5G NR network real-time spectrum data is the sum of the 5G NR base station signal component and the interference noise component.

Further, the calculation formula of the 5G NR base station signal component is:

5G NR base station signal component = S (PDCCH) signal component - S (PDSCH) signal component - S (PBCH) signal component - S (DM-RS) signal component - S (SRS) signal component - S (CSI-RS) signal Component-S(PT-RS)Signal Component-S(PSS)Signal Component-S(SSS)Signal Component-S(PUCCH)Signal Component-s(PUSCH)Signal Component-s(PRACH)Signal Component-s(DMRS) Signal component -s(PTRS) signal component + S(GP) signal component,

Among them, the S(GP) signal component is the guard interval, and the 5G NR signal is not sent.

Further, the calculation formula of the interference noise component is:

Interference noise signal component G(t) = total real-time spectrum S(t)-S(PDCCH) signal component-S(PDSCH) signal component-S(PBCH) signal component-S(DM-RS) signal component-S( SRS) signal component-S(CSI-RS) signal component-S(PT-RS) signal component-S(PSS) signal component-S(SSS) signal component-S(PUCCH) signal component-s(PUSCH) signal component -s(PRACH) signal component -s(DMRS) signal component -s(PTRS) signal component + S(GP) signal component.

The present invention also proposes a real-time spectrum symbol filtering interference detection system based on 5GNR network synchronization, characterized in that the system includes:

Antenna unit and radio frequency unit: used to complete the complete collection of air interface 5G NR network signals and signal noise, convert analog signals into digital signals, output the total real-time spectrum S(t), and filter and detect by the central processing unit;

Synchronization module: used to receive GPS Beidou signals, and obtain 5G NR system frame start time data to synchronize with 5G network wireless frames;

Symbol filter: used for real-time detection of spectrum of multiple symbol units;

GPS Beidou module: used to receive wireless signals from satellites;

Central processing unit: used to receive the 5G NR synchronous clock, and to separate and detect the signal component of the base station and the interference signal component in the processing time limit of the signal of the radio frequency unit;

Display controller: used to display the analysis results of 5G NR interference noise components;

The system inputs the 5G NR network analog signal through the antenna unit and converts the signal form through the radio frequency unit to convert the analog signal into a data signal. When the central processing unit receives the digital signal, the 5G NR network is obtained through clock synchronization and signal component symbol filtering processing algorithm. Real-time spectrum data, through the symbol filter to detect the corresponding filtered time slot length, subcarrier interval SUBCARRIER interval KHz, the number of time slots of the wireless frame, the length of the OFDM symbol and the length of the symbol filter, and finally display the waveform length on the display controller and compare.

Further, the antenna unit and the radio frequency unit include sampling, quantization and encoding in the process of converting the analog signal into a data signal, specifically including:

Sampling refers to replacing the original continuous signal in time with a sequence of signal samples at regular intervals, that is, discretizing the analog signal in time.

Quantization is to approximate the original continuously changing amplitude value with a finite number of amplitude values, and change the continuous amplitude of the analog signal into a finite number of discrete values with a certain interval.

Coding is to represent the quantized value in binary numbers according to certain rules, and then convert it into a binary or multi-valued digital signal stream. The digital signals thus obtained can be transmitted through digital lines such as cables, microwave trunks, satellite channels, etc. At the receiving end, it is the opposite of the above-mentioned digitization process of the analog signal, which is then restored to the original analog signal after post-filtering. The above-mentioned process of digitization is also called pulse code modulation.

Compared with the prior art, the present invention has the following beneficial effects:

1. The present invention quickly synchronizes to the system frame start time of the 5G base station signal through precise clock synchronization (synchronization accuracy reaches the microsecond level), thereby obtaining 5G NR real-time spectrum data, ensuring the integrity of source data acquisition for subsequent detection. accuracy;

2. The present invention also realizes the separation, extraction and detection of the 5G NR base station signal component and the interference signal component through the 5G NR symbol filtering algorithm, and achieves the purpose of accurately measuring the interference signal;

3. The technology of the present invention does not need to perform complex base station signal cell search and synchronous demodulation, thus greatly shortening the time for separation and detection of signal components and reducing the complexity of hardware design.

Description of drawings

In order to explain the embodiments of the present invention or the technical solutions in the prior art more clearly, the following briefly introduces the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can also be obtained according to these drawings without creative efforts.

Fig. 1 is the spectrum diagram of the interference signal component submerged in the 100MHz signal in the prior art

Fig. 2 is the composition and operation schematic diagram of the detection system mentioned in the present invention;

3 is a schematic diagram of a synchronization algorithm for real-time spectrum detection and analysis of 5G NR radio frames in the present invention;

Fig. 4 is the symbol filtering length schematic diagram of different NUMBERLOGY of the present invention;

5 is a structural diagram of a 5G NR real-time spectrum symbol filtering algorithm of the present invention;

6 is a schematic diagram of the analysis result displayed by the display controller of the present invention,

7 is a schematic flowchart of the detection method mentioned in the present invention;

Fig. 8 is the composition schematic diagram of the system mentioned in the present invention,

Among them, 100 antenna units; 200 radio frequency units; 300 synchronization modules; 400 central processing units; 500 GPS Beidou modules; 600 symbol filters; 700 display controllers

Detailed ways

In order to make the objectives, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be described in detail below. Obviously, the described embodiments are only some, but not all, embodiments of the present invention. Based on the embodiments of the present invention, all other implementations obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present invention.

The present invention provides a real-time spectrum symbol filtering interference detection method and system based on 5GNR network synchronization. The technical solutions provided by the present invention will be described in more detail below with reference to FIGS. 1 to 8 .

As shown in Figure 1 to Figure 8, in order to solve the problem that the sampling rate of the traditional spectrum detection method cannot reach the minimum symbol time unit (4.46us-71.35us) of 5G, the interference signal component is submerged in the 100MHz base station signal, resulting in the inability to distinguish the interference signal. Therefore, it is impossible to perform effective direction finding and positioning on the interference signal. The specific problem is shown in Figure 1. The present invention proposes a real-time spectrum symbol filtering interference detection method based on 5GNR network synchronization, as shown in Figure 7. The method includes: :

S1. Receive the input of the 5G NR network analog signal, quickly synchronize to the system frame start time of the 5G NR base station signal through clock synchronization, synchronize with the 5G network wireless frame, and then output the 5G NR network real-time spectrum data;

S2. After the data received through GPS and Beidou Navigation are synchronized, the 5G base station signal is divided into multiple symbol unit spectrums and the corresponding symbol filter is used for detection;

S3. The signal components and interference noise components of the 5G NR base station are respectively obtained by applying the signal component symbol filtering processing algorithm to the spectrum of different symbol units, and the detection results of the interference components of the 5G NR network are displayed through the display controller.

In the process of fast clock synchronization, it includes receiving the analog signal of the 5G base station and converting the analog signal into a digital signal, and then outputting real-time spectrum data. According to the converted spectrum data, the current network variable is added, and the current network variable is 300us.

The digital conversion of analog signals includes three basic steps: sampling, quantization and encoding, including:

Sampling refers to replacing the original continuous signal in time with a sequence of signal samples at regular intervals, that is, discretizing the analog signal in time.

Quantization is to approximate the original continuously changing amplitude value with a finite number of amplitude values, and change the continuous amplitude of the analog signal into a finite number of discrete values with a certain interval.

Coding is to represent the quantized value in binary numbers according to certain rules, and then convert it into a binary or multi-valued digital signal stream. The digital signals thus obtained can be transmitted through digital lines such as cables, microwave trunks, satellite channels, etc. At the receiving end, it is the opposite of the above-mentioned digitization process of the analog signal, which is then restored to the original analog signal after post-filtering. The above-mentioned process of digitization is also called pulse code modulation.

Sampling: The so-called sampling is to extract an instantaneous amplitude value (sampling value) of the voice signal every certain time interval T, and a series of sampling values that are discrete in time after sampling are called sample value sequences. The sample value sequence after sampling is discrete in time, and can be time-division multiplexed, and each sample value can be quantized and encoded into binary digital signals.

Quantization: There are two ways of quantization. In the quantization method, only rounding is performed, that is, all input voltages between 0 and 1 volts output 0 volts, and all input voltages between 1 and 2 volts output 1 volts, etc. With this quantization method, the input voltage is always greater than the output voltage, so the resulting quantization error is always positive, and the maximum quantization error is equal to the interval Δ between two adjacent quantization levels.

Encoding: The simplest encoding is binary encoding. Specifically, the quantized samples are represented by n-bit binary codes, each binary number corresponds to a quantized value, and then they are arranged to obtain a digital information stream composed of binary pulses. In addition to the above-mentioned natural binary codes, there are other forms of binary codes, such as Gray codes and folded binary codes.

Convert between analog and digital signals:

The analog signal is generally quantized into a digital signal by PCM pulse code modulation (Pulse Code Modulation) method, that is, the different amplitudes of the analog signal correspond to different binary values. For example, 8-bit encoding can be used to quantize the analog signal into 2^8=256 magnitude, 24-bit or 30-bit encoding is often used in practice;

The digital signal is generally converted into an analog signal by the method of phase-shifting the carrier. Computers, computer local area networks and metropolitan area networks all use binary digital signals. In the 21st century, what are actually transmitted in computer wide area networks are both binary digital signals and analog signals converted from digital signals. But the more promising application is the digital signal.

As shown in Figure 2, after the digital conversion of the analog signal, the 5G base station signal can be divided into multiple symbol unit spectrums and detected using the corresponding symbol filter, wherein the multiple symbol unit spectrums include 71.42us, 35.71us, 17.84us, 8.92us, 4.46us, correspondingly select No. 0 symbol filter detection, No. 1 symbol filter detection, No. 2 symbol filter detection, No. 3 symbol filter detection, No. 4 symbol filter detection.

As shown in Figure 3, the synchronization algorithm for real-time spectrum detection and analysis of 5G NR radio frames is stipulated in the original 3GPP specification. The length of the radio frame of 5G NR is 10ms, each radio frame is divided into 10 subframes, and the length of each subframe is 1ms, using 5ms In the present invention, taking NUMBERLOGY-1 as an example, the GPS reference time is preferably 300us as a variable. Of course, the present invention also includes other variables that can be modified according to the 5G existing network settings. Calculating backwards in time, nine SUBFRAME subframes of S1-S9 are divided in the first 1000us band, and D/D/D/D/D/D/D/S/U can be divided into D/D/D/D/D/D/D/S/U in the S1-S5 band /U sequenced time slots, in which the S-band includes 14 time slots sequenced by D/D/D/D/D/D/GP/GP/GP/GP/U/U/U/U , where D represents 5G NR downlink physical channel time, GP represents guard interval time, U represents 5GNR uplink physical channel time, and downlink physical channels include PDCCH, PDSCH, PBCH, DM-RS, SRS, CSI-RS, PT-RS, PSS , SSS, uplink physical channels include PUCCH, PUSCH, PRACH, SRS, DMRS, PTRS,

In the present invention, the signal component symbol filtering processing algorithm, as shown in Figure 5, specifically includes the following algorithm:

The calculation formula of the 5G NR base station signal component is:

5G NR base station signal component = S (PDCCH) signal component - S (PDSCH) signal component - S (PBCH) signal component - S (DM-RS) signal component - S (SRS) signal component - S (CSI-RS) signal Component-S(PT-RS)Signal Component-S(PSS)Signal Component-S(SSS)Signal Component-S(PUCCH)Signal Component-s(PUSCH)Signal Component-s(PRACH)Signal Component-s(DMRS) Signal component -s(PTRS) signal component + S(GP) signal component,

Among them, the S(GP) signal component is the guard interval, and the 5G NR signal is not sent.

The calculation formula of the interference noise component is:

Interference noise signal component G(t) = total real-time spectrum S(t)-S(PDCCH) signal component-S(PDSCH) signal component-S(PBCH) signal component-S(DM-RS) signal component-S( SRS) signal component-S(CSI-RS) signal component-S(PT-RS) signal component-S(PSS) signal component-S(SSS) signal component-S(PUCCH) signal component-s(PUSCH) signal component -s(PRACH) signal component -s(DMRS) signal component -s(PTRS) signal component + S(GP) signal component.

The real-time spectrum data of the 5G NR network is the sum of the signal component and the interference noise component of the 5G NR base station.

As shown in FIG. 2 and FIG. 8 , the present invention extends and proposes a real-time spectrum symbol filtering interference detection system based on 5GNR network synchronization on the basis of the above method. The system and the contents of the system work include:

The antenna unit 100 and the radio frequency unit 200 are used to complete the complete collection of the air interface 5G NR network signal and signal noise, convert the analog signal into a digital signal, and output the total amount of real-time spectrum S(t), which is filtered and processed by the central processing unit 400. detection processing;

Synchronization module 300: used to receive GPS Beidou signals, obtain 5G NR system frame start time data, and synchronize with 5G network wireless frames;

Symbol filter 600: for performing real-time detection of multiple symbol unit spectrums;

GPS Beidou module 500: used to receive wireless signals conducted from satellites;

Central processing unit 400: used to receive the 5G NR synchronous clock, and to separate and detect the signal component of the base station signal component and the interference signal component with the processing time limit on the signal of the radio frequency unit;

Display controller 700: used to display the analysis result of the 5G NR interference noise component;

The system inputs the 5G NR network analog signal through the antenna unit 100 and converts the signal form through the radio frequency unit 200, and converts the analog signal into a data signal. When the central processing unit 400 receives the digital signal, it is obtained through clock synchronization and signal component symbol filtering processing algorithm. The 5G NR network real-time spectrum data, as shown in Figure 4, is used to detect the corresponding filtered time slot length, subcarrier interval SUBCARRIER interval KHz, the number of time slots of the radio frame, the length of the OFDM symbol and the length of the symbol filter through the symbol filter 600. Finally, the waveform length is displayed and compared on the display controller 700. The final result is shown in Figure 6. The peaks of the interference signals can be clearly seen by enlarging the spectrogram, and the band where the interference signals are detected is cleaned in the chromatographic waterfall.

The present invention is a method designed to detect and separate interfering signal components on the problem of interference radio waves in various types of radio waves. The present invention preferably uses 5G signals as an embodiment. However, the method mentioned in the present invention and its extensions The scheme obviously also includes other radio waves used for communication.

The above description is only a preferred embodiment of the present invention, but the protection scope of the present invention is not limited to this. The equivalent replacement or change of the inventive concept thereof shall be included within the protection scope of the present invention.

Claims (8)

1. A real-time spectrum symbol filtering interference detection method based on 5GNR network synchronization is characterized in that: the method comprises the following steps:

s1, receiving input of a 5G NR network analog signal, quickly synchronizing to the system frame starting time of a 5G NR base station signal through clock synchronization, synchronizing with a 5G network wireless frame, and further outputting 5G NR network real-time frequency spectrum data;

s2, after data received through GPS and Beidou navigation are synchronized, dividing a 5G base station signal into a plurality of segmented unit frequency spectrums and detecting by using corresponding filters;

and S3, respectively obtaining the 5G NR base station signal component and the interference noise component by the different segmented unit spectrums through a signal component symbol filtering processing algorithm, and displaying the detection result of the 5G NR network interference component through a display controller.

2. The method for detecting interference based on real-time spectrum symbol filtering of 5GNR network synchronization according to claim 1, wherein: the clock synchronization comprises the steps of receiving an analog signal of a 5G base station, converting the analog signal into a digital signal, further outputting real-time frequency spectrum data, and adding a current network variable according to the converted frequency spectrum data, wherein the current network variable is 300 us.

3. The method for detecting interference based on real-time spectrum symbol filtering of 5GNR network synchronization according to claim 1, wherein: the segmented unit spectrums comprise 71.42us, 35.71us, 17.84us, 8.92us and 4.46us, and filter detection No. 0, filter detection No. 1, filter detection No. 2, filter detection No. 3 and filter detection No. 4 are correspondingly selected.

4. The method for detecting interference based on real-time spectrum symbol filtering of 5GNR network synchronization according to claim 1, wherein: the signal component symbol filtering processing algorithm comprises a 5G NR base station signal component and an interference noise component, and the 5G NR network real-time spectrum data is the sum of the 5G NR base station signal component and the interference noise component.

5. The method for detecting interference based on real-time spectrum symbol filtering of 5GNR network synchronization according to claim 4, wherein: the calculation formula of the 5G NR base station signal component is as follows:

5G NR base station signal component-S (pdcch) signal component-S (pdsch) signal component-S (pbch) signal component-S (DM-RS) signal component-S (srs) signal component-S (CSI-RS) signal component-S (PT-RS) signal component-S (pss) signal component-S (sss) signal component-S (pucch) signal component-S (pusch) signal component-S (prach) signal component-S (dmrs) signal component-S (ptrs) signal component + S (gp) signal component,

wherein, the S (GP) signal component is a guard interval and does not transmit a 5G NR signal;

s represents a signal component.

6. The method for detecting interference based on real-time spectrum symbol filtering of 5GNR network synchronization according to claim 4, wherein: the calculation formula of the interference noise component is as follows:

interference noise signal component g (t) real-time total spectrum amount S (t) -S (pdcch) signal component-S (pdsch) signal component-S (pbch) signal component-S (DM-RS) signal component-S (srs) signal component-S (CSI-RS) signal component-S (PT-RS) signal component-S (pss) signal component-S (sss) signal component-S (pucch) signal component-S (pusch) signal component-S (prach) signal component-S (dmrs) signal component-S (ptrs) signal component + S (gp) signal component;

where S represents a signal component.

7. A real-time spectrum symbol filtering interference detection system based on 5GNR network synchronization is characterized in that: the system comprises:

antenna unit and radio frequency unit: the system is used for completely acquiring air interface 5G NR network signals and signal noise, converting analog signals into digital signals, outputting the total amount of real-time frequency spectrum S (t), and performing filtering and demodulation processing by a central processing unit;

a synchronization module: the system is used for receiving GPS Beidou signals, acquiring frame starting time data of a 5G NR system and synchronizing with a 5G network wireless frame;

a filter: the system is used for detecting a plurality of segmented unit spectrums in real time;

GPS big dipper module: for receiving wireless signals conducted from a satellite;

a central processing unit: the system comprises a receiving unit, a processing unit and a processing unit, wherein the receiving unit is used for receiving a 5G NR synchronous clock and separating and detecting a base station signal component and an interference signal component when processing a signal of a radio frequency unit;

a display controller: an analysis result for displaying the 5G NR interference noise component;

the method comprises the steps of inputting 5G NR network analog signals through an antenna unit, carrying out signal form conversion through a radio frequency unit, converting the analog signals into digital signals, obtaining 5G NR network real-time frequency spectrum data through a clock synchronization and signal component symbol filtering processing algorithm after a central processing unit receives the digital signals, detecting the corresponding filtering time slot length, subcarrier interval, interval frequency, the number of wireless frames, OFDM symbol length and filter length through a filter, and finally displaying and comparing the waveform length on a display controller.

8. The system for real-time spectrum symbol filtering interference detection based on 5GNR network synchronization of claim 7, wherein: the antenna unit and the radio frequency unit include sampling, quantization and encoding in the process of converting an analog signal into a digital signal, and specifically include:

sampling means that a sequence of signal samples at regular intervals is used to replace an original continuous signal in time, namely, an analog signal is discretized in time;

the quantization is to use a finite number of amplitude values to approximate the original continuously changing amplitude values, and change the continuous amplitude of the analog signal into a finite number of discrete values with certain intervals;

the coding is that according to a certain rule, the quantized value is represented by binary digits and then converted into binary or multi-valued digital signal stream; the digital signals obtained in this way can be transmitted via cables, microwave trunks or satellite channels; at the receiving end, the digitalization process of the analog signal is opposite to that of the analog signal, and the original analog signal is restored through post-filtering; the process of converting an analog signal to a digital signal is also known as pulse code modulation.

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