CN112671484A

CN112671484A - Real-time spectrum symbol filtering interference detection method and system based on 5GNR network synchronization

Info

Publication number: CN112671484A
Application number: CN201910978330.0A
Authority: CN
Inventors: 刘稳
Original assignee: Guangdong Zhenzi Electronic Technology Co ltd
Current assignee: Guangdong Zhenzi Electronic Technology Co ltd
Priority date: 2019-10-15
Filing date: 2019-10-15
Publication date: 2021-04-16
Anticipated expiration: 2039-10-15
Also published as: CN112671484B

Abstract

The invention provides a real-time frequency spectrum symbol filtering interference detection method and a system based on 5GNR network synchronization, which receive the input of a 5G NR network analog signal 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, synchronize a clock to the system frame starting time of a 5G NR base station signal quickly, and further output the 5G NR network real-time frequency spectrum data; after data received by a GPS and a Beidou navigation system are synchronized, dividing a 5G base station signal into a plurality of symbol unit frequency spectrums and detecting by using corresponding symbol filters; the method and the device have the advantages that the 5G NR base station signal component and the interference noise component are respectively obtained by different symbol unit frequency spectrums through a signal component symbol filtering processing algorithm, and the detection result of the 5G NR network interference component is displayed through the display controller.

Description

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

Technical Field

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

Background

The 5G network is referred to as a fifth generation network in the development of the mobile communication network, and compared with the previous four generation mobile network, the 5G network shows more enhanced functions in the practical application process, and theoretically, the transmission speed can reach tens of GB per second, which is hundreds of times of that of the 4G mobile network. For a 5G network, the 5G network shows more obvious advantages and more powerful functions in the practical application process, the 5G network supports both TDD and FDD duplex modes, but the base station density of the 5G network is increased, the network bandwidth is also increased to 100MHz, compared with the FDD duplex mode, the TDD spectrum flexibility is better, so that the TDD technology becomes the main choice of the 5G network technology, with the advance of the 5G network, the interference problem is difficult to avoid, and the TDD duplexed 5G NR network faces the technical problem of network interference investigation.

Most of the existing 5G NR interference checking technical solutions are that, because the sampling rate cannot reach the minimum symbol time unit of 5G (4.46us-71.35us) using the traditional spectrum detection method, the interference signal component is submerged in the 5G base station signal of 100MHz, such a technique clearly cannot distinguish the interference signal, and thus, effective direction finding and positioning cannot be performed on the interference signal.

Based on the above series of problems, the following technical solutions have been developed.

Disclosure of Invention

The invention aims to provide a real-time frequency spectrum symbol filtering interference detection method and a real-time frequency spectrum symbol filtering interference detection system based on 5GNR network synchronization, which realize the separation, extraction and detection of a 5G NR base station signal component and an interference signal component and achieve the aim of accurately measuring an interference signal.

In order to achieve the purpose, the invention provides the following technical scheme:

the invention provides a real-time spectrum symbol filtering interference detection method based on 5GNR network synchronization, which 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 symbol unit frequency spectrums and detecting by using corresponding symbol filters;

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

Further, the clock synchronization process comprises receiving an analog signal of the 5G base station and converting the analog signal into a digital signal, and further outputting real-time spectrum data, and adding a present network variable according to the converted spectrum data, wherein the present network variable is 300 us.

Further, the plurality of symbol unit spectrums include 71.42us, 35.71us, 17.84us, 8.92us and 4.46us, and symbol filter detection 0, symbol filter detection 1, symbol filter detection 2, symbol filter detection 3 and symbol filter detection 4 are selected correspondingly.

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 a 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,

wherein, the s (gp) signal component is a guard interval, and no 5G NR signal is transmitted.

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

interference noise signal component g (t) real time spectrum total 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 invention also provides a real-time spectrum symbol filtering interference detection system based on 5GNR network synchronization, which 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 symbol filter: the method is used for detecting a plurality of symbol 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 base station, a radio frequency unit, a clock generator and a clock generator, wherein the base station is used for receiving a 5G NR synchronous clock and carrying out separation detection on a signal component of a radio frequency unit and an interference signal component when processing a signal of the radio frequency unit;

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

the system inputs 5G NR network analog signals through an antenna unit, performs signal form conversion through a radio frequency unit, converts the analog signals into data signals, obtains 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, detects the time slot length, SUBCARRIER interval SUBCARRIER interval KHz, the time slot number of wireless frames, OFDM symbol length and symbol filter length of corresponding filtering through a symbol filter, and finally performs waveform length display and comparison on a display controller.

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

sampling is the discretization of an analog signal in time by replacing the original continuous signal in time with a sequence of signal samples at regular intervals.

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

The coding is to represent the quantized value by binary number according to a certain rule, and then to convert the value into binary or multi-valued digital signal stream. The digital signal thus obtained can be transmitted via digital lines such as cable, microwave trunk, satellite channels, etc. At the receiving end, the digitization process is opposite to the analog signal digitization process, and the original analog signal is restored through post-filtering. The above-mentioned digitization process is also called pulse code modulation.

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

1. according to the invention, through accurate clock synchronization (the synchronization precision reaches microsecond level), the system frame starting time of the 5G base station signal is quickly synchronized, so that the 5G NR real-time frequency spectrum data is obtained, the integrity of the source data acquisition is ensured, and the accuracy of subsequent detection is facilitated;

2. the invention also realizes the separation, extraction and detection of the signal component and the interference signal component of the 5G NR base station by a 5G NR symbol filtering algorithm, and achieves the aim of accurately measuring the interference signal;

3. the invention does not need to search and synchronously demodulate the complicated base station signal cells, thereby greatly shortening the time of separating and detecting the signal components and reducing the complexity of hardware design.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a prior art spectral diagram of a signal with interference signal components submerged at 100MHz

FIG. 2 is a schematic diagram of the components and operation of the detection system of the present invention;

FIG. 3 is a schematic diagram of a synchronization algorithm for real-time spectrum detection and analysis of a 5G NR wireless frame according to the present invention;

FIG. 4 is a schematic diagram of symbol filter lengths for different NUMBBERLOGY of the present invention;

FIG. 5 is a block diagram of the 5G NR real-time spectral symbol filtering algorithm of the present invention;

FIG. 6 is a schematic diagram showing the analysis results displayed by the display controller according to the present invention,

FIG. 7 is a schematic flow chart of the detection method of the present invention;

figure 8 is a schematic diagram of the composition of the system of the present invention,

wherein, 100 antenna elements; 200 radio frequency units; 300 a synchronization module; 400 central processing unit; 500GPS Beidou module; a 600 symbol filter; 700 display controller

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the examples given herein without any inventive step, are within the scope of the present invention.

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

As shown in fig. 1 to 8, in order to solve the problem that the conventional spectrum detection method cannot effectively detect and locate the interference signal because the sampling rate cannot reach the minimum symbol time unit of 5G (4.46us-71.35us), and the interference signal component is submerged in the 100MHz base station signal, the interference signal cannot be resolved, and thus the interference signal cannot be effectively detected, specifically, as shown in fig. 1, the present invention provides a real-time spectrum symbol filtering interference detection method based on 5GNR network synchronization, as shown in fig. 7, the method includes:

In the process of clock fast synchronization, the method 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.

The analog signal digital conversion comprises three basic links: sampling, quantizing and encoding, specifically comprising:

Sampling: sampling is to extract an instantaneous amplitude value (sample value) of a voice signal at regular time intervals T, and a series of sample values discrete in time after sampling is called a sample sequence. The sampled sample sequence is discrete in time, and may be time division multiplexed, or each sample may be quantized and encoded into a binary digital signal.

And (3) quantification: the quantization has two modes, in the quantization mode, the rounding is only cut off, namely all input voltages between 0 and 1 volt output 0 volt, all input voltages between 1 and 2 volt output 1 volt and the like. With this quantization approach, the input voltage is always greater than the output voltage, and therefore the resulting quantization error is always positive, with the maximum quantization error equal to the separation Δ of two adjacent quantization levels.

And (3) encoding: the simplest encoding is binary encoding. Specifically, n-bit binary codes are used to represent quantized samples, each binary number corresponding to a quantized value, and the quantized values are arranged to obtain a digital information stream consisting of binary pulses. In addition to the natural binary code described above, there are other forms of binary codes, such as gray code and folded binary code, etc.

The analog signal and the digital signal can be converted into each other:

the analog signal is generally quantized into a digital signal by a PCM Pulse Code Modulation (Pulse Code Modulation) method, that is, different amplitudes of the analog signal correspond to different binary values, for example, the analog signal can be quantized into 2^8 ^ 256 orders by using 8-bit coding, and 24-bit or 30-bit coding is often used in practice;

the digital signal is generally converted into an analog signal by shifting the Phase of a carrier wave (Phase Shift). Binary digital signals are used in computers, computer local area networks and metropolitan area networks, and the binary digital signals and analog signals converted from the digital signals are actually transmitted in the computer wide area network in the 21 st century. But digital signals are more promising for application.

As shown in fig. 2, after the analog signal is digitized, the 5G base station signal may be divided into a plurality of symbol unit spectrums, and detected by using corresponding symbol filters, where the plurality of symbol unit spectrums includes 71.42us, 35.71us, 17.84us, 8.92us, and 4.46us, and symbol filter detection No. 0, symbol filter detection No. 1, symbol filter detection No. 2, symbol filter detection No. 3, and symbol filter detection No. 4 are selected correspondingly.

As shown in fig. 3, the synchronization algorithm for real-time spectrum detection and analysis of 5G NR wireless frames is specified in the original 3GPP specifications, the length of a 5G NR wireless frame is 10ms, each wireless frame is divided into 10 SUBFRAMEs, each SUBFRAME is 1ms, and a cyclic SUBFRAME structure of 5ms is adopted, in the present invention, numberlog-1 is taken as an example, the reference time of GPS is preferably 300us as a variable, and of course, the present invention further includes other variables that can be modified according to the existing network setting of 5G, and the real-time spectrum detection start time is calculated backwards, so that nine SUBFRAME SUBFRAMEs of S1-S9 are obtained in the first 1000us band, and slots arranged in the sequence of D/GP/S in the S1-S5 band are obtained, and slots arranged in the sequence U/U/U are sequentially arranged into 14 time slots, wherein D represents 5G NR downlink physical channel time, GP represents guard interval time, U represents 5G NR uplink physical channel time, the downlink physical channel comprises PDCCH, PDSCH, PBCH, DM-RS, SRS, CSI-RS, PT-RS, PSS and SSS, the uplink physical channel comprises PUCCH, PUSCH, PRACH, SRS, DMRS and PTRS,

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

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

The calculation formula of the interference noise component is as follows:

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

As shown in fig. 2 and fig. 8, the invention provides a real-time spectrum symbol filtering interference detection system based on 5GNR network synchronization, which is extended based on the above method, and the system and its system operation content include:

antenna unit 100 and radio frequency unit 200: the central processing unit 400 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;

the synchronization module 300: 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;

the symbol filter 600: the method is used for detecting a plurality of symbol unit spectrums in real time;

GPS big dipper module 500: for receiving wireless signals conducted from a satellite;

the central processing unit 400: the system comprises a base station, a radio frequency unit, a clock generator and a clock generator, wherein the base station is used for receiving a 5G NR synchronous clock and carrying out separation detection on a signal component of a radio frequency unit and an interference signal component when processing a signal of the radio frequency unit;

the display controller 700: an analysis result for displaying the 5G NR interference noise component;

the system inputs 5G NR network analog signals through an antenna unit 100, performs signal form conversion through a radio frequency unit 200, converts the analog signals into data signals, obtains 5G NR network real-time frequency spectrum data through a clock synchronization and signal component symbol filtering processing algorithm after a central processing unit 400 receives digital signals, detects the corresponding filtering time slot length, SUBCARRIER interval SUBCARRIER interval KHz, the time slot number of wireless frames, OFDM symbol length and symbol filter length through a symbol filter 600 as shown in figure 4, finally performs waveform length display and comparison on a display controller 700, and finally obtains a result as shown in figure 6, wherein the wave crest of interference signals can be obviously seen through amplifying a frequency spectrum diagram, and the wave band where the interference signals are detected is cleaned in a color spectrum waterfall.

The invention relates to a method for detecting and separating interference signal components, which is designed on the problem that various radio waves have interference waves, and the invention preferably adopts a 5G signal as an embodiment, but the method and the scheme extended by the method obviously also comprise other radio waves for communication.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.

Claims

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:

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 process 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 plurality of symbol unit spectrums comprise 71.42us, 35.71us, 17.84us, 8.92us and 4.46us, and symbol filter detection No. 0, symbol filter detection No. 1, symbol filter detection No. 2, symbol filter detection No. 3 and symbol 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:

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:

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

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 data signal, and specifically include: