CN117318872B - TDEV time domain noise generation method and device - Google Patents
TDEV time domain noise generation method and device Download PDFInfo
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Abstract
The application discloses a TDEV time domain noise generation method, which solves the problem that time domain noise generated by the prior art cannot meet any TDEV. The method comprises the following steps: selecting a TDEV template; sampling the TDEV template in the time domain; calculating a frequency spectrum range through a conversion relation between sampling time and frequency; obtaining a signal power spectrum through the conversion relation between the TDEV and the power spectrum; interpolation operation is carried out on the power spectrum, and lost power spectrum information is supplemented; adding phase information to the power spectrum after the interpolation operation to obtain a frequency domain response; and carrying out Fourier inverse transformation on the frequency domain response to obtain the time domain noise corresponding to the TDEV template. According to the method, lost noise power spectrum information is supplemented through a frequency domain interpolation method, and meanwhile, a time domain noise signal corresponding to any TDEV template is generated through a frequency domain phase information supplementing mode. The generated time domain noise can meet the requirements of equipment noise margin test, network limit evaluation and the like.
Description
Technical Field
The present disclosure relates to the field of synchronous noise technologies, and in particular, to a method and an apparatus for generating TDEV time domain noise.
Background
Time Deviance (TDEV) is an important evaluation index of synchronization noise in a communication network. The MTIE and TDEV are proposed to normalize the output drift of the synchronous (timing) interface as proposed by ITU-T g.823 standard control of jitter and drift in digital networks based on the 2048kbit/s regime. Meanwhile, the noise margin of the synchronous equipment and the time domain noise signal index in the noise transfer test are mainly expressed by TDEV. Therefore, a method for generating a time domain noise signal corresponding to any TDEV template needs to be researched so as to meet related testing and noise evaluation requirements.
Disclosure of Invention
The embodiment of the application provides a TDEV time domain noise generation method and device, which solve the problem that the time domain noise generated by the prior art cannot meet any TDEV.
The embodiment of the application provides a TDEV time domain noise generation method, which comprises the following steps:
selecting a TDEV template;
sampling the TDEV template in the time domain;
calculating a frequency spectrum range through a conversion relation between sampling time and frequency;
calculating a signal power spectrum through the conversion relation between the TDEV and the power spectrum;
interpolation operation is carried out on the power spectrum, and lost power spectrum information is supplemented;
adding phase information to the power spectrum after the interpolation operation to obtain a frequency domain response;
and carrying out Fourier inverse transformation on the frequency domain response to obtain the time domain noise corresponding to the TDEV template.
Further, the method further comprises the steps of: the generated time domain noise is derived.
Further, the method further comprises the steps of:
and comparing the TDEV of the calculated time domain noise with a TDEV template, and calculating the relative deviation.
Further, the method further comprises the steps of:
setting the generated TDEV relative deviation interval.
Further, the interpolation method specifically comprises the following steps:
and estimating the approximate power values of the power spectrum at other frequency points in the frequency spectrum range of the power spectrum through limited numerical values on the power spectrum of the TDEV time domain noise, and obtaining more power spectrum information.
Further, the interpolation method selects interpolation functions as Lagrange interpolation, piecewise linear interpolation, hermite interpolation or cubic spline interpolation.
The embodiment of the application also provides a TDEV time domain noise generation device, which is used for realizing the method of any one of the embodiments, and comprises an acquisition module and a determination module. And the acquisition module is used for sampling the TDEV in the time domain. The determining module is used for calculating the frequency spectrum range and the power spectrum. And interpolating the power spectrum to supplement the lost power spectrum information. Obtaining a frequency domain response by adding phase information to the power spectrum after the interpolation operation; and obtaining the time domain noise by carrying out Fourier inverse transformation on the frequency domain response.
The present application also provides a computer-readable storage medium having stored thereon a computer program which, when executed by a processor, implements the method of any of the above embodiments.
The embodiment of the application also provides an electronic device, which comprises a memory, a processor and a computer program stored on the memory and capable of being run on the processor, and the electronic device is characterized in that the method in any embodiment is realized when the processor executes the computer program.
The above-mentioned at least one technical scheme that this application embodiment adopted can reach following beneficial effect:
the method for spectrum interpolation effectively supplements the problem of power spectrum information loss caused by non-uniform sampling of a frequency domain. And generating a time domain noise signal corresponding to any TDEV template by supplementing the frequency domain phase mode. The generated time domain noise can meet the requirements of equipment noise margin test, network limit evaluation and the like.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiments of the application and together with the description serve to explain the application and do not constitute an undue limitation to the application. In the drawings:
fig. 1 is a flowchart of a TDEV time domain noise generation method according to an embodiment of the present application;
FIGS. 2.1 to 2.3 are schematic diagrams of a TDEV template for noise generation in an embodiment of the present application;
FIGS. 3.1-3.3 are diagrams illustrating noise power spectra according to embodiments of the present application;
FIGS. 4.1-4.3 are diagrams illustrating the generation of time domain noise signals according to embodiments of the present application;
FIGS. 5.1 to 5.3 are schematic diagrams illustrating comparison of TDEV results of time domain noise in an embodiment of the present application;
FIGS. 6.1 to 6.3 are schematic diagrams of TDEV relative deviation generated by noise in the embodiment of the present application;
fig. 7 is a block diagram of a TDEV time domain noise generating apparatus according to an embodiment of the present application;
fig. 8 is a schematic structural diagram of an electronic device according to an embodiment of the present application.
Detailed Description
For the purposes, technical solutions and advantages of the present application, the technical solutions of the present application will be clearly and completely described below with reference to specific embodiments of the present application and corresponding drawings. It will be apparent that the described embodiments are only some, but not all, of the embodiments of the present application. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.
The following describes in detail the technical solutions provided by the embodiments of the present application with reference to the accompanying drawings.
Fig. 1 is a flowchart of a TDEV time domain noise generation method according to an embodiment of the present application. The embodiment of the application provides a TDEV time domain noise generation method, which comprises the following steps of 101-107:
and 101, selecting a TDEV template.
Selecting a target TDEV (tau) template, wherein the TDEV has the expression:
equation 1
Wherein the method comprises the steps ofSampling data for a phase;
for the time interval between adjacent samples;
is the number of samples in the integration time;
is the integration time.
Step 102, the TDEV template is sampled in the time domain.
For example, TDEV (τ) shown in equation 1 is sampled in time domain τ.
Step 103, calculating the spectrum range through time domain up sampling.
Calculating spectral range using equation 2f：
f=0.3/τeqn 2
Step 104, calculating a signal power spectrum through the conversion relation between the TDEV and the power spectrum.
As can be seen from ITU-T G.812 standard appendix I, there is a correspondence between TDEV and power spectrum as follows:
equation 3
Wherein the method comprises the steps ofIs the power spectrum of the signal.
Will befSubstitution formulaCalculating power spectrum +.>；
And 105, interpolating the power spectrum and supplementing lost power spectrum information.
Further, the interpolation method specifically comprises the following steps: and estimating the approximate power values of the power spectrum at other frequency points in the frequency spectrum range of the power spectrum through limited numerical values on the power spectrum of the TDEV time domain noise, and obtaining more power spectrum information.
Further, the interpolation method selects interpolation functions as Lagrange interpolation, piecewise linear interpolation, hermite interpolation or cubic spline interpolation.
The interpolation method selects different types of interpolation functions, and the estimated effects are different, including but not limited to: lagrangian interpolation, piecewise linear interpolation, hermite interpolation, cubic spline interpolation.
And 106, adding phase information to the power spectrum subjected to the interpolation operation to obtain a frequency domain response.
Equation 4
And 107, performing Fourier transform on the frequency domain response to obtain time domain noise corresponding to the TDEV template.
Equation 5
Further, the method further comprises the steps of:
step 108, deriving the generated time domain noise.
Deriving a generated time domain noise sequence。
Fig. 2.1 to 2.3 are schematic diagrams of a noise generation TDEV template according to an embodiment of the present application. Three typical TDEV noise templates were chosen for simulation, wherein fig. 2.1 is an ITU-T g.811.1 enhanced reference master clock (enhanced Primary Reference Clock, ePRC) noise generating TDEV indicator, the curve being characterized as a straight line. Fig. 2.2 is a graph of TDEV indicator generated by noise of synchronous supply units (Synchronization Supply Unit, SSU) of ITU-T g.812, the curve being characterized by a broken line. Fig. 2.3 is a graph of the noise generation TDEV indicator of the enhanced synchronous device clock (enhanced Synchronous Equipment Clock, eSEC) of ITU-T g.8262.1, which is characterized by a small amplitude.
Fig. 3.1 to 3.3 are schematic diagrams of noise power spectrums according to embodiments of the present application. Time domain sampling is carried out on the TDEV curve, and a signal power spectrum is obtained through calculation of a formula 2 and a formula 3Interpolation is carried out on the power spectrum, and lost power spectrum information is supplemented to obtain +.>. Wherein fig. 3.1 is the noise power spectrum of the ePRC. Fig. 3.2 is a noise power spectrum of the SSU. FIG. 3.3 eSECIs a noise power spectrum of (a).
Fig. 4.1 to 4.3 are schematic diagrams of generating a time domain noise signal according to an embodiment of the present application. According to equation 4 pairAdding phase information to obtain frequency domain response +.>. According to equation 5, p->Performing Fourier inverse transformation to obtain generated time domain noiseWherein fig. 4.1 is the time domain noise signal of ePRC. Fig. 4.2 is a time domain noise signal of the SSU. Fig. 4.3 is a time domain noise signal of eSEC.
Further, the embodiment of the present application further includes steps 109 to 110.
Step 109, calculating TDEV of time domain noise;
TDEV of time domain noise is noted as
And step 110, comparing the calculated relative deviation with the TDEV template.
The formula is adopted:
equation 6
The relative deviation is calculated.
For example, TDEV indices of three device time domain noise signals are calculated. And compared to a nominal TDEV index. The results are shown in fig. 5.1 to 5.3, which are comparison diagrams of TDEV results of time domain noise in the embodiment of the present application. Wherein fig. 5.1 is an ePRC time domain noise TDEV result comparison. Fig. 5.2 is an SSU time domain noise TDEV result comparison. Fig. 5.3 is a TDEV result alignment of eSEC time domain noise.
Setting the generated TDEV relative deviation interval. For example, the deviation interval is set within ±20%, and the compliance with the standard requirement is determined in response to the TDEV relative deviation being within the deviation interval.
Fig. 6.1 to 6.3 are graphs of TDEV relative deviation due to noise in the embodiment of the present application, showing the relative deviation of TDEV from nominal TDEV. As shown in fig. 6.1, the relative deviation of TDEV generated by ePRC is-2.5% to 1.4%, as shown in fig. 6.2, the relative deviation of TDEV generated by SSU is-17.2% to 18.7%, and as shown in fig. 6.3, the relative deviation of TDEV generated by eSEC is-9.7% to 11.7%. In a typical template type test method, the requirement for template deviation is within ±20%.
Fig. 7 is a block diagram of a TDEV time domain noise generating apparatus according to an embodiment of the present application. The embodiment of the present application further provides a TDEV time domain noise generating device, which is configured to implement the method described in any one of the foregoing embodiments, and includes an acquisition module 710 and a determination module 720.
And the acquisition module is used for sampling the TDEV in the time domain.
The determining module is used for calculating a frequency spectrum range and a power spectrum; interpolation is carried out on partial power spectrum, and lost power spectrum information is supplemented; obtaining a frequency domain response by adding phase information to the power spectrum after the interpolation operation; and obtaining the time domain noise by carrying out Fourier inverse transformation on the frequency domain response.
The method is based on the correspondence between the TDEV and the power spectrum, and firstly samples the TDEV on the time domain and converts the TDEV into the power spectrum. Then, the power spectrum is interpolated and phase information is added, and a corresponding time domain noise signal is obtained through Fourier inverse transformation. The method can generate a time domain noise signal corresponding to any TDEV template.
It will be appreciated by those skilled in the art that embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
Accordingly, the present application also proposes a computer readable storage medium, on which a computer program is stored, which program, when being executed by a processor, implements a method as described in any of the embodiments of the present application.
Further, the application also proposes an electronic device comprising a memory, a processor and a computer program stored on the memory and executable by the processor, said processor implementing a method according to any of the embodiments of the application when executing said computer program.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
In one typical configuration, a computing device includes one or more processors (CPUs), input/output interfaces, network interfaces, and memory. The memory may include volatile memory in a computer-readable medium, random Access Memory (RAM) and/or nonvolatile memory, such as Read Only Memory (ROM) or flash memory (flash RAM). Memory is an example of computer-readable media.
Fig. 8 is a schematic structural diagram of an electronic device according to an embodiment of the present application.
The electronic device 600 shown is merely an example and should not be construed to limit the functionality and scope of use of embodiments of the present application. It comprises the following steps: one or more processors 620; a storage 610, configured to store one or more programs that, when executed by the one or more processors 620, cause the one or more processors 620 to implement a TDEV time domain noise generation method provided by an embodiment of the present application, the method includes:
selecting a TDEV template;
sampling the TDEV template in the time domain;
calculating a frequency spectrum range through a conversion relation between sampling time and frequency;
calculating a signal power spectrum through the conversion relation between the TDEV and the power spectrum;
interpolation is carried out on the power spectrum, and lost power spectrum information is supplemented;
adding phase information to the power spectrum after the interpolation operation to obtain frequency response;
and carrying out Fourier inverse transformation on the frequency domain response to obtain the time domain noise corresponding to the TDEV template.
The electronic device 600 further comprises input means 630 and output means 640; the processor 620, the storage device 610, the input device 630, and the output device 640 in the electronic device may be connected by a bus or other means, which is shown as a connection via a bus 650.
The storage device 610 is a computer readable storage medium, and may be used to store a software program, a computer executable program, and a module unit, such as program instructions corresponding to the TDEV time domain noise generating method in the embodiment of the present application. The storage device 610 may mainly include a storage program area and a storage data area, wherein the storage program area may store an operating system, at least one application program required for functions; the storage data area may store data created according to the use of the terminal, etc. In addition, the storage 610 may include high-speed random access memory, and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other non-volatile solid-state storage device. In some examples, the storage device 610 may further include memory remotely located with respect to the processor 620, which may be connected via a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.
The input device 630 may be used to receive input numeric, character information, or voice information, and to generate key signal inputs related to user settings and function control of the electronic device. The output device 640 may include an electronic device such as a display screen, a speaker, etc.
It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article or apparatus that comprises the element.
The foregoing is merely exemplary of the present application and is not intended to limit the present application. Various modifications and changes may be made to the present application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc. which are within the spirit and principles of the present application are intended to be included within the scope of the claims of the present application.
Claims (6)
1. A TDEV time domain noise generation method, characterized by comprising the steps of:
selecting a TDEV template, and sampling the TDEV template in a time domain;
calculating a frequency spectrum range through a conversion relation between sampling time and frequency;
calculating a signal power spectrum through the conversion relation between the TDEV and the power spectrum;
interpolation operation is carried out on the power spectrum, and lost power spectrum information is supplemented;
adding phase information to the power spectrum after the interpolation operation to obtain a frequency domain response;
performing Fourier inverse transformation on the frequency domain response to obtain time domain noise corresponding to the TDEV template;
setting the generated TDEV relative deviation interval, and calculating time domain noiseAnd comparing the calculated relative deviation with the TDEV template.
2. The TDEV time domain noise generation method according to claim 1, characterized in that the interpolation method is specifically:
and estimating the power values of the power spectrum at other frequency points in the frequency spectrum range of the TDEV time domain noise through a limited number of values on the power spectrum.
3. The TDEV time domain noise generating method according to claim 1 or 2, characterized in that the interpolation method uses an interpolation function of lagrangian interpolation, piecewise linear interpolation, hermite interpolation or cubic spline interpolation.
4. A TDEV time domain noise generating apparatus for implementing the method of any one of claims 1 to 3, characterized by comprising an acquisition module and a determination module;
the acquisition module is used for sampling the TDEV in the time domain;
the determining module is used for calculating a frequency spectrum range and a power spectrum; interpolation is carried out on the power spectrum, and lost power spectrum information is supplemented; obtaining a frequency domain response by adding phase information to the power spectrum after the interpolation operation; and obtaining the time domain noise by carrying out Fourier inverse transformation on the frequency domain response.
5. A computer readable storage medium, on which a computer program is stored, characterized in that the program, when being executed by a processor, implements the method according to any of claims 1-3.
6. An electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor implements the method of any of claims 1-3 when executing the computer program.
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