CN114244450A - Signal identification method and device, electronic equipment and storage medium - Google Patents
Signal identification method and device, electronic equipment and storage medium Download PDFInfo
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Abstract
The invention provides a signal identification method, a signal identification device, electronic equipment and a storage medium. The method comprises the following steps: acquiring frequency domain data of a TDD LTE working frequency band; and determining the frequency domain signal at the current moment according to the frequency domain data, and determining the uplink and the downlink of the frequency domain signal according to the parameters of the frequency domain signal. According to the method and the device, whether the uplink signal in a short distance exists in the frequency domain signal at the current moment can be efficiently identified at low cost by determining the frequency domain signal at the current moment and according to the basic signal parameters of the frequency domain signal, so that the method and the device have high application value and low complexity.
Description
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a signal identification method and apparatus, an electronic device, and a storage medium.
Background
Currently, long Term evolution lte (long Term evolution) has been used as the mainstream mobile communication technology and is applied in the major countries around the world. LTE includes two duplex modes, frequency Division duplex fdd (frequency Division duplexing) and time Division duplex tdd (time Division duplexing). Since the uplink and downlink of TDD are distinguished by time, it is difficult to distinguish whether the TDD LTE signal is sent by the base station (downlink signal) or the mobile phone (uplink signal) by observing the spectrum with a spectrometer or other instrument. However, in radio monitoring applications, it is critical to distinguish the source of the signal.
For the distinction of TDD LTE uplink and downlink signals, in the prior art, a synchronization position of an LTE frame is determined by receiving a synchronization signal of a base station, and then uplink and downlink communication time of TDD LTE is calculated according to a ratio of uplink and downlink time slots of a TDD LTE cell. And finally, distinguishing the uplink and downlink signals according to the calculated uplink and downlink communication time. Then, the method has high implementation complexity, needs to implement most of channel protocols of an LTE physical layer, has high difficulty and high software and hardware cost, and is not suitable for radio frequency spectrum monitoring application without high precision requirements.
Disclosure of Invention
The invention provides a signal identification method, a signal identification device, electronic equipment and a storage medium, which are used for solving the defects of high complexity and high software and hardware cost in the prior art and efficiently identifying TDD LTE uplink signals by a simple and low-cost method.
The invention provides a signal identification method, which comprises the following steps:
acquiring frequency domain data of a TDD LTE working frequency band;
and determining the frequency domain signal at the current moment according to the frequency domain data, and determining the uplink and the downlink of the frequency domain signal according to the frequency domain signal parameters.
According to the signal identification method provided by the invention, the acquiring of the frequency domain data of the TDD LTE working frequency band comprises the following steps:
receiving a TDD LTE wireless signal through a radio frequency channel;
sequentially carrying out analog-digital conversion and digital down-conversion on the TDD LTE wireless signal to obtain IQ data of a TDD LTE working frequency band;
and carrying out Fourier transform on the IQ data to obtain frequency domain data of a TDD LTE working frequency band.
According to the signal identification method provided by the invention, the frequency domain signal of the current moment is determined according to the frequency domain data, and the method comprises the following steps:
carrying out noise estimation on the frequency domain data, and determining a bottom noise value of the frequency domain data;
and determining the frequency domain signal existing at the current moment according to the background noise value.
According to the signal identification method provided by the invention, the frequency domain signal existing at the current moment is determined according to the background noise value, and the method comprises the following steps:
and if the frequency domain energy in the frequency domain at the current moment is larger than the first threshold value of the background noise value, judging that a frequency domain signal exists in the frequency domain at the current moment.
According to a signal identification method provided by the present invention, determining the uplink and the downlink to which the frequency domain signal belongs according to the basic signal parameter of the frequency domain signal comprises:
acquiring the bandwidth and the signal-to-noise ratio of the frequency domain signal;
when the bandwidth of the frequency domain signal is smaller than the product of the cell working bandwidth and a second threshold value, and the signal-to-noise ratio of the frequency domain signal is larger than a third threshold value, determining the frequency domain signal as an uplink signal;
and when the bandwidth of the frequency domain signal is not less than the product of the cell working bandwidth and a second threshold value, or the signal-to-noise ratio of the frequency domain signal is not greater than a third threshold value, determining the frequency domain signal as a downlink signal.
The present invention also provides a signal recognition apparatus, comprising:
the acquisition module is used for acquiring frequency domain data of a TDD LTE working frequency band;
and the processing module is used for determining the frequency domain signal at the current moment according to the frequency domain data and determining the uplink and the downlink to which the frequency domain signal belongs according to the frequency domain signal parameters.
According to a signal identification apparatus provided by the present invention, the processing module is specifically configured to:
acquiring the bandwidth and the signal-to-noise ratio of the frequency domain signal;
when the bandwidth of the frequency domain signal is smaller than the product of the cell working bandwidth and a second threshold value, and the signal-to-noise ratio of the frequency domain signal is larger than a third threshold value, determining the frequency domain signal as an uplink signal;
and when the bandwidth of the frequency domain signal is not less than the product of the cell working bandwidth and a second threshold value, or the signal-to-noise ratio of the frequency domain signal is not greater than a third threshold value, determining the frequency domain signal as a downlink signal.
The present invention also provides an electronic device, comprising a memory, a processor and a computer program stored in the memory and executable on the processor, wherein the processor implements the steps of the signal identification method as described in any one of the above when executing the program.
The invention also provides a non-transitory computer-readable storage medium having stored thereon a computer program which, when executed by a processor, performs the steps of the signal recognition method as described in any of the above.
The invention also provides a computer program product comprising a computer program which, when executed by a processor, performs the steps of the signal identification method as described in any one of the above.
The invention provides a signal identification method, a signal identification device, electronic equipment and a storage medium. Firstly, frequency domain data of a TDD LTE working frequency band is obtained, then a frequency domain signal at the current moment is determined according to the frequency domain data, and an uplink and a downlink to which the frequency domain signal belongs are determined according to basic signal parameters of the frequency domain signal. According to the method and the device, whether the uplink signal in a short distance exists in the frequency domain signal at the current moment can be efficiently identified at low cost by determining the frequency domain signal at the current moment and according to the basic signal parameters of the frequency domain signal, so that the method and the device have high application value and low complexity.
Drawings
In order to more clearly illustrate the technical solutions of the present invention or the prior art, the drawings needed for the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.
FIG. 1 is a schematic flow chart of a signal identification method provided by the present invention;
FIG. 2 is a schematic diagram of an application scenario of the signal identification method provided by the present invention;
FIG. 3 is a second schematic flow chart of a signal identification method according to the present invention;
FIG. 4 is a third schematic flow chart of a signal identification method provided by the present invention;
FIG. 5 is a schematic diagram of a frequency spectrum of a downlink signal provided by the present invention;
FIG. 6 is a schematic diagram of an uplink signal spectrum provided by the present invention;
FIG. 7 is a schematic structural diagram of a signal recognition device provided in the present invention;
fig. 8 is a schematic structural diagram of an electronic device provided in the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Fig. 1 is a schematic flow chart of a signal identification method provided by the present invention, fig. 3 is a second schematic flow chart of the signal identification method provided by the present invention, and fig. 4 is a third schematic flow chart of the signal identification method provided by the present invention. The signal recognition method of the present invention is described below with reference to fig. 1, 3, and 4. As shown in fig. 1, the signal identification method provided by the present invention includes:
step 101: acquiring frequency domain data of a TDD LTE working frequency band;
in this step, it should be noted that, firstly, the TDD LTE wireless signal is received through the radio frequency channel, then, the LTE wireless signal is subjected to analog-to-Digital conversion through the analog-to-Digital converter adc (analog-to-Digital converter) to obtain time domain data of the TDD LTE wireless signal, and then, the IQ data of the TDD LTE operating frequency band is obtained through Digital Down-conversion ddc (Digital Down converter) decimation filtering, where the IQ data is time domain data in which signal amplitude and phase characteristics are recorded. And then, performing fast Fourier transform (fft) on the IQ data to obtain frequency domain data of the TDD LTE operating band.
Step 102: and determining the frequency domain signal at the current moment according to the frequency domain data, and determining the uplink and the downlink of the frequency domain signal according to the frequency domain signal parameters.
In this step, after the frequency domain data of the TDD LTE operating frequency band is obtained, a noise floor value of the frequency domain data is first determined by a noise estimation method, and if the frequency domain energy in the frequency domain at the current time is greater than the noise floor value by a certain threshold, it is determined that a frequency domain signal exists in the frequency domain at the current time. After determining the frequency domain signal, obtaining basic parameters of the frequency point, power, bandwidth, signal-to-noise ratio and the like of the frequency domain signal, if the bandwidth S of the frequency domain signal is smaller than the working bandwidth Bx the threshold ratio R of the cell and the signal-to-noise ratio of the frequency domain signal is larger than the threshold T, judging that an uplink signal exists at the moment, and if not, judging that the uplink signal exists as a downlink signal. R can be valued and adjusted according to actual conditions, and the R value is less than 1; t is the threshold of signal-to-noise ratio, and the value of T is more than 3.
The signal identification method provided by the invention comprises the steps of firstly obtaining frequency domain data of a TDD LTE working frequency band, then determining a frequency domain signal at the current moment according to the frequency domain data, and determining the uplink and the downlink of the frequency domain signal according to basic signal parameters of the frequency domain signal. According to the method and the device, whether the uplink signal in a short distance exists in the frequency domain signal at the current moment can be efficiently identified at low cost by determining the frequency domain signal at the current moment and according to the basic signal parameters of the frequency domain signal, so that the method and the device have high application value and low complexity.
Based on the content of the foregoing embodiment, in this embodiment, the acquiring frequency domain data of the TDD LTE operating band includes:
receiving a TDD LTE wireless signal through a radio frequency channel;
sequentially carrying out analog-digital conversion and digital down-conversion on the TDD LTE wireless signal to obtain IQ data of a TDD LTE working frequency band;
and carrying out Fourier transform on the IQ data to obtain frequency domain data of a TDD LTE working frequency band.
In this embodiment, it should be noted that, first, a TDD LTE wireless signal is received through a radio frequency channel, then, analog-to-digital conversion is performed on the TDD LTE wireless signal through an analog-to-digital converter ADC to obtain time domain data of the TDD LTE wireless signal, and then, digital down-conversion DDC (decimation filtering is performed to obtain IQ data of a TDD LTE operating frequency band, where the IQ data is time domain data in which signal amplitude and phase characteristics are recorded is performed.
Based on the content of the foregoing embodiment, in this embodiment, determining the frequency domain signal of the current time according to the frequency domain data includes:
carrying out noise estimation on the frequency domain data, and determining a bottom noise value of the frequency domain data;
and determining the frequency domain signal existing at the current moment according to the background noise value.
Based on the content of the foregoing embodiment, in this embodiment, determining a frequency domain signal existing at the current time according to the noise floor value includes:
and if the frequency domain energy in the frequency domain at the current moment is larger than the first threshold value of the background noise value, judging that a frequency domain signal exists in the frequency domain at the current moment.
Based on the content of the foregoing embodiment, in this embodiment, determining the uplink and the downlink to which the frequency domain signal belongs according to the basic signal parameter of the frequency domain signal includes:
acquiring the bandwidth and the signal-to-noise ratio of the frequency domain signal;
when the bandwidth of the frequency domain signal is smaller than the product of the cell working bandwidth and a second threshold value, and the signal-to-noise ratio of the frequency domain signal is larger than a third threshold value, determining the frequency domain signal as an uplink signal;
and when the bandwidth of the frequency domain signal is not less than the product of the cell working bandwidth and a second threshold value, or the signal-to-noise ratio of the frequency domain signal is not greater than a third threshold value, determining the frequency domain signal as a downlink signal.
The following is illustrated by specific examples:
the first embodiment is as follows:
in this embodiment, it should be noted that, in the radio monitoring application, it is particularly concerned whether there is TDD LTE uplink communication in the near field to prevent an illegal terminal from performing data transmission. Therefore, after the TDD LTE wireless signal is acquired, signal analysis is performed, and then a signal emission source is identified, and for illegal signal emission, management and control are performed. Due to the characteristics of time division multiplexing, it is difficult to correctly identify a signal emission source only by a frequency spectrum, and it is impossible to distinguish whether the signal emission source is base station emission (downlink) or mobile phone emission (uplink). The existing method for distinguishing TDD LTE uplink signals is as follows: the signal receiving equipment receives an LTE signal, and searches and analyzes a primary Synchronization signal PSS (Primary Synchronization signal) and a secondary Synchronization signal SSS (Secondary Synchronization signal), so as to obtain time and frequency Synchronization with a cell. The signal receiving equipment analyzes the PBCH (physical Broadcast channel) Broadcast and system information of the cell again to obtain the ratio of uplink and downlink time slots of the cell, and calculates the uplink and downlink communication time of the TDD LTE. And identifying whether the signal is uplink or downlink according to the calculated uplink and downlink time. However, the method has high implementation complexity, needs to implement most of channel protocols of an LTE physical layer, and has great difficulty and high software and hardware costs. For radio spectrum monitoring applications, the accuracy requirements are not as high, and therefore the technique is not applicable.
The invention provides a method for identifying TDD LTE uplink signals with high efficiency and low cost by analyzing frequency domain energy only without synchronizing and decoding TDD LTE physical channels by utilizing the difference of the distances between a base station, a mobile phone terminal and a signal analysis point and according to the different characteristics of TDD LTE downlink transmission and TDD LTE uplink transmission. Specifically, as shown in fig. 2, the present invention is mainly applied to a radio monitoring scenario in which a signal analysis device receives and analyzes an air TDD LTE wireless signal to identify a transmission source of the signal. The signal emission source is generally close to the analysis equipment and belongs to a TDD LTE uplink emission terminal, and the base station is a TDD LTE downlink emission terminal. The invention provides a method for realizing identification of close-range TDD LTE uplink signals with high efficiency and low cost.
In this embodiment, as shown in fig. 5, for the TDD LTE signal, since the Downlink cell reference signal is distributed in the entire LTE cell frequency domain, and the energy of the Downlink physical Shared channel pdsch (physical Downlink Shared channel) is not particularly different from the reference signal. As shown in fig. 6, for the uplink signal, the energy is mainly concentrated on the subcarriers scheduled for data transmission in the frequency domain, so the frequency spectrum is relatively not flat, and such spectral characteristics of the uplink signal are more obvious because the uplink terminal is closer to the location of the signal analysis device in the radio signal monitoring application. Based on the characteristic that uplink and downlink signals are distributed on a frequency spectrum, the invention provides a method for identifying a TDD LTE uplink signal, as shown in FIG. 4, signal analysis equipment needs to firstly sample a TDD LTE working frequency band, and the sampling analysis bandwidth should be larger than the LTE cell bandwidth. The number of sampling points can be determined according to the implementation situation. The number of sampling points will determine the signal analysis resolution and the sampling time, sampling time = number of points divided by the sampling rate, analysis resolution = sampling analysis bandwidth divided by number of points. The signal analysis resolution does not need to be too high, and is generally larger than the LTE downlink reference signal symbol interval by 6 subcarriers at 80 KHz. If the sampling time is 1ms longer than one LTE subframe, aliasing of multiple LTE subframes in frequency domain exists, so that the condition is suitable for the condition that the uplink signal is obviously larger than the downlink signal; if the sampling time is less than 0.5ms of one time slot of LTE, pure uplink and pure downlink frequency domain data exist, and the method is suitable for distinguishing the condition that the energy difference between an uplink signal and a downlink signal is not obvious.
After the TDD LTE working frequency band signal is sampled, time domain IQ data obtained by sampling can be converted into frequency domain data through Fourier transform, and then signal background noise is estimated in the frequency domain. And detecting signals according to the signal-to-noise ratio condition of each frequency domain position, and measuring basic signal parameters such as signal frequency points, power, bandwidth, signal-to-noise ratio and the like.
If the signal bandwidth S is smaller than the cell working bandwidth BxR and the signal-to-noise ratio of the signal is larger than the threshold T, the uplink signal exists at the moment, otherwise, the uplink signal is the downlink signal. R can be valued and adjusted according to actual conditions, and the R value is less than 1; t is the threshold of signal-to-noise ratio, and the value of T is more than 3.
In the embodiment, the invention selects proper sampling points to sample the cell bandwidth signal according to the practical application condition; then, detecting and analyzing signals in the working bandwidth of the TDD LTE cell to obtain signal frequency points, power, bandwidth and signal-to-noise ratio; then, according to the set signal bandwidth ratio threshold R and the set signal-to-noise ratio threshold T, judging; the judging method comprises the following steps: s < B R and N > T. S is the signal bandwidth; b is LTE cell bandwidth; r is a bandwidth ratio threshold, less than 1. N is the signal-to-noise ratio of the signal; t is a signal-to-noise ratio judgment threshold, and is generally larger than 3. Therefore, the method and the device can not obtain the strict uplink and downlink time of the TDD LTE through complex signal synchronization, physical broadcast channel and broadcast message analysis, but can identify the close-range TDD LTE uplink communication signal only through the energy difference and the difference of the uplink and downlink frequency spectrum characteristics. The method is particularly suitable for signal monitoring occasions requiring low cost and low accuracy requirement.
The signal identification device provided by the present invention is described below, and the signal identification device described below and the signal identification method described above may be referred to in correspondence with each other.
As shown in fig. 7, the present invention provides a signal identifying apparatus, including:
an obtaining module 1, configured to obtain frequency domain data of a TDD LTE working frequency band;
and the processing module 2 is configured to determine a frequency domain signal at the current time according to the frequency domain data, and determine an uplink and a downlink to which the frequency domain signal belongs according to frequency domain signal parameters.
In this embodiment, it should be noted that, first, a TDD LTE wireless signal is received through a radio frequency channel, then, analog-to-Digital conversion is performed on the TDD LTE wireless signal through an analog-to-Digital converter (adc) to obtain time domain data of the TDD LTE wireless signal, and then, IQ data of a TDD LTE operating frequency band is obtained through Digital Down-conversion ddc (Digital Down converter) decimation filtering, where the IQ data is time domain data in which signal amplitude and phase characteristics are recorded. And then, performing fast Fourier transform (fft) on the IQ data to obtain frequency domain data of the TDD LTE operating band.
In this embodiment, after obtaining the frequency domain data of the TDD LTE operating frequency band, first, a noise floor value of the frequency domain data is determined by a noise estimation method, and if the frequency domain energy in the frequency domain at the current time is greater than the noise floor value by a certain threshold, it is determined that a frequency domain signal exists in the frequency domain at the current time. After determining the frequency domain signal, obtaining basic parameters such as frequency point, power, bandwidth and the like of the frequency domain signal, if the bandwidth S of the frequency domain signal is smaller than the working bandwidth Bx the threshold ratio R of the cell and the signal-to-noise ratio of the frequency domain signal is larger than the threshold T, judging that an uplink signal exists at the moment, and if not, judging that the uplink signal is a downlink signal. R can be valued and adjusted according to actual conditions, and the R value is less than 1; t is the threshold of signal-to-noise ratio, and the value of T is more than 3.
The signal identification device provided by the invention firstly acquires frequency domain data of a TDD LTE working frequency band, then determines a frequency domain signal at the current moment according to the frequency domain data, and determines the uplink and the downlink of the frequency domain signal according to the basic signal parameters of the frequency domain signal. According to the method and the device, whether the uplink signal in a short distance exists in the frequency domain signal at the current moment can be efficiently identified at low cost by determining the frequency domain signal at the current moment and according to the basic signal parameters of the frequency domain signal, so that the method and the device have high application value and low complexity.
Based on the content of the foregoing embodiment, in this embodiment, the processing module is specifically configured to:
acquiring the bandwidth and the signal-to-noise ratio of the frequency domain signal;
when the bandwidth of the frequency domain signal is smaller than the product of the cell working bandwidth and a second threshold value, and the signal-to-noise ratio of the frequency domain signal is larger than a third threshold value, determining the frequency domain signal as an uplink signal;
and when the bandwidth of the frequency domain signal is not less than the product of the cell working bandwidth and a second threshold value, or the signal-to-noise ratio of the frequency domain signal is not greater than a third threshold value, determining the frequency domain signal as a downlink signal.
Fig. 8 illustrates a physical structure diagram of an electronic device, and as shown in fig. 8, the electronic device may include: a processor (processor)810, a communication Interface 820, a memory 830 and a communication bus 840, wherein the processor 810, the communication Interface 820 and the memory 830 communicate with each other via the communication bus 840. The processor 810 may invoke logic instructions in the memory 830 to perform a signal recognition method comprising: acquiring frequency domain data of a TDD LTE working frequency band; and determining the frequency domain signal at the current moment according to the frequency domain data, and determining the uplink and the downlink of the frequency domain signal according to the basic signal parameters of the frequency domain signal.
In addition, the logic instructions in the memory 830 may be implemented in software functional units and stored in a computer readable storage medium when the logic instructions are sold or used as independent products. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
In another aspect, the present invention also provides a computer program product, the computer program product comprising a computer program, the computer program being storable on a non-transitory computer-readable storage medium, the computer program, when executed by a processor, being capable of executing the signal identification method provided by the above methods, the method comprising: acquiring frequency domain data of a TDD LTE working frequency band; and determining the frequency domain signal at the current moment according to the frequency domain data, and determining the uplink and the downlink of the frequency domain signal according to the basic signal parameters of the frequency domain signal.
In yet another aspect, the present invention also provides a non-transitory computer-readable storage medium having stored thereon a computer program which, when executed by a processor, implements a method for signal recognition provided by the above methods, the method comprising: acquiring frequency domain data of a TDD LTE working frequency band; and determining the frequency domain signal at the current moment according to the frequency domain data, and determining the uplink and the downlink of the frequency domain signal according to the basic signal parameters of the frequency domain signal.
The above-described embodiments of the apparatus are merely illustrative, and the units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware. With this understanding in mind, the above-described technical solutions may be embodied in the form of a software product, which can be stored in a computer-readable storage medium such as ROM/RAM, magnetic disk, optical disk, etc., and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the methods described in the embodiments or some parts of the embodiments.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. A signal identification method, comprising:
acquiring frequency domain data of a TDD LTE working frequency band;
and determining the frequency domain signal at the current moment according to the frequency domain data, and determining the uplink and the downlink of the frequency domain signal according to the frequency domain signal parameters.
2. The signal identification method of claim 1, wherein the obtaining frequency domain data of the TDD LTE operating band comprises:
receiving a TDD LTE wireless signal through a radio frequency channel;
sequentially carrying out analog-digital conversion and digital down-conversion on the LTE wireless signal to obtain IQ data of a TDD LTE working frequency band;
and carrying out Fourier transform on the IQ data to obtain frequency domain data of a TDD LTE working frequency band.
3. The signal identification method of claim 1, wherein determining the frequency domain signal of the current time according to the frequency domain data comprises:
carrying out noise estimation on the frequency domain data, and determining a bottom noise value of the frequency domain data;
and determining the frequency domain signal existing at the current moment according to the background noise value.
4. The signal identification method of claim 3, wherein determining the frequency domain signal existing at the current time according to the noise floor value comprises:
and if the frequency domain energy in the frequency domain at the current moment is larger than the first threshold value of the background noise value, judging that a frequency domain signal exists in the frequency domain at the current moment.
5. The signal identification method of claim 1, wherein determining the uplink and the downlink to which the frequency domain signal belongs according to the frequency domain signal parameters comprises:
acquiring the bandwidth and the signal-to-noise ratio of the frequency domain signal;
when the bandwidth of the frequency domain signal is smaller than the product of the cell working bandwidth and a second threshold value, and the signal-to-noise ratio of the frequency domain signal is larger than a third threshold value, determining the frequency domain signal as an uplink signal;
and when the bandwidth of the frequency domain signal is not less than the product of the cell working bandwidth and a second threshold value, or the signal-to-noise ratio of the frequency domain signal is not greater than a third threshold value, determining the frequency domain signal as a downlink signal.
6. A signal identifying apparatus, comprising:
the acquisition module is used for acquiring frequency domain data of a TDD LTE working frequency band;
and the processing module is used for determining the frequency domain signal at the current moment according to the frequency domain data and determining the uplink and the downlink of the frequency domain signal according to the parameters of the frequency domain signal.
7. The signal identification device of claim 6, wherein the processing module is specifically configured to:
acquiring the bandwidth and the signal-to-noise ratio of the frequency domain signal;
when the bandwidth of the frequency domain signal is smaller than the product of the cell working bandwidth and a second threshold value, and the signal-to-noise ratio of the frequency domain signal is larger than a third threshold value, determining the frequency domain signal as an uplink signal;
and when the bandwidth of the frequency domain signal is not less than the product of the cell working bandwidth and a second threshold value, or the signal-to-noise ratio of the frequency domain signal is not greater than a third threshold value, determining the frequency domain signal as a downlink signal.
8. An electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, characterized in that the steps of the signal recognition method according to any of claims 1 to 5 are implemented when the processor executes the program.
9. A non-transitory computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out the steps of the signal recognition method according to any one of claims 1 to 5.
10. A computer program product comprising a computer program, characterized in that the computer program realizes the steps of the signal recognition method according to any one of claims 1 to 5 when executed by a processor.
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