CN115189785B - Method, system and equipment for verifying Doppler spread of channel - Google Patents
Method, system and equipment for verifying Doppler spread of channel Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 43
- 238000001228 spectrum Methods 0.000 claims abstract description 117
- 238000012795 verification Methods 0.000 claims abstract description 30
- 238000005307 time correlation function Methods 0.000 claims description 21
- 230000006870 function Effects 0.000 claims description 19
- 230000003595 spectral effect Effects 0.000 claims description 15
- 238000004891 communication Methods 0.000 abstract description 9
- 238000012545 processing Methods 0.000 description 12
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- 238000012360 testing method Methods 0.000 description 5
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- 230000008878 coupling Effects 0.000 description 3
- 238000010168 coupling process Methods 0.000 description 3
- 238000005859 coupling reaction Methods 0.000 description 3
- 238000010606 normalization Methods 0.000 description 3
- 230000002093 peripheral effect Effects 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 238000004088 simulation Methods 0.000 description 3
- 238000001514 detection method Methods 0.000 description 2
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- H—ELECTRICITY
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Abstract
The present application relates to the field of communications, and in particular, to a method, system, and device for verifying doppler spread of a channel. Wherein the method comprises the following steps: acquiring spectrum information of a first signal, wherein the first signal is sent by a first channel; determining whether the first signal meets a preset spectrum characteristic; if the first signal meets the preset frequency spectrum characteristic, determining whether the first signal meets a preset time correlation characteristic; and if the first signal meets the preset time correlation characteristic, determining that the first channel passes the Doppler spread verification. In the method, whether the first channel passes the Doppler spread verification is determined by judging whether the first signal meets the correlation characteristics of the preset frequency spectrum characteristics and the preset time, so that the problems of misjudgment and insufficient verification caused by judging the Doppler spread verification by adopting a subjective judgment method are avoided.
Description
[ field of technology ]
The present application relates to the field of communications, and in particular, to a method, system, and device for verifying doppler spread of a channel.
[ background Art ]
In the wireless communication technology, information interaction and data transmission are performed between a base station and a terminal through a channel. When evaluating the channel performance between the base station and the terminal, the channel is often subjected to simulation test according to relevant channel parameters to determine the performance of the channel. In the prior art, a multiple input and output over the air (Multiple Input Multiple Output Over The Air, MIMO OTA) test system is typically employed to validate and test the channel model. Specifically, the test content includes: time delay power spectrum verification, doppler spread verification, spatial correlation verification and cross polarization ratio verification. When the Doppler spread verification is performed, a subjective judgment mode is often adopted to determine whether the Doppler spread meets theoretical requirements, so that inaccurate Doppler spread verification caused by subjective judgment errors and other conditions is easy to occur.
[ application ]
In order to solve the above-mentioned problems, an embodiment of the present application provides a method for verifying doppler spread of a channel, which determines whether a first channel transmitting a first signal passes the doppler spread verification by performing calculation verification on spectral features and time correlation features of the first signal.
In a first aspect, an embodiment of the present application provides a method for verifying doppler spread of a channel, including:
acquiring spectrum information of a first signal, wherein the first signal is sent by a first channel;
determining whether the first signal meets a preset spectrum characteristic;
if the first signal meets the preset frequency spectrum characteristic, determining whether the first signal meets a preset time correlation characteristic;
and if the first signal meets the preset time correlation characteristic, determining that the first channel passes the Doppler spread verification.
In the embodiment of the application, firstly, the spectrum characteristics are verified according to the spectrum information of the first signal, and when the first signal meets the preset spectrum characteristics, the time correlation of the first signal is verified. And when the first signal meets the preset time correlation characteristic, determining that the first signal passes the Doppler spread verification. According to the embodiment of the application, the calculation is carried out according to the frequency spectrum information, whether the preset frequency spectrum characteristic and the time correlation characteristic are met or not is determined according to the calculation result, and the conditions of misjudgment or inaccurate verification caused by subjective judgment are avoided.
In one possible implementation manner, before determining whether the first signal meets the preset spectrum characteristic, the method further includes:
normalizing the spectrum information according to the maximum amplitude information in the spectrum information;
and determining whether the first signal meets preset spectrum characteristics or not based on the normalized spectrum information.
In one possible implementation manner, determining whether the first signal meets a preset spectrum characteristic includes:
determining whether the first signal meets a rectangular window template characteristic according to the spectrum information of the first signal;
and if the first signal meets the rectangular window template characteristics, determining that the first signal meets the preset frequency spectrum characteristics.
In one possible implementation manner, determining whether the first signal meets a rectangular window template feature according to spectrum information of the first signal includes:
determining maximum frequency offset information of the first signal according to the wavelength information and the wave velocity information of the first signal;
determining a first frequency range and a non-first frequency range according to the maximum frequency offset information;
determining whether the amplitude information of the first signal in the first frequency range and the non-first frequency range meets the rectangular window template characteristics according to the frequency spectrum information;
and if the amplitude information of the first signal in the first frequency range and the amplitude information of the first signal in the non-first frequency range meet the rectangular window template characteristics, determining that the first signal meets the rectangular window template characteristics.
In one possible implementation manner, determining whether the amplitude information of the first signal in the first frequency range and the non-first frequency range meets the rectangular window template feature according to the frequency spectrum information includes:
determining threshold information of the rectangular window template according to the characteristics of the rectangular window template;
determining whether amplitude information of a first signal in a first frequency range is greater than or equal to the threshold information according to frequency spectrum information of the first signal;
determining whether amplitude information of a first signal in a non-first frequency range is smaller than or equal to the threshold information according to frequency spectrum information of the first signal;
and if the amplitude information of the first signal in the first frequency range is larger than or equal to the threshold information and the amplitude information of the first signal in the non-first frequency range is smaller than or equal to the threshold information, determining that the first signal meets the rectangular window template characteristic.
In one possible implementation manner, determining whether the first signal meets a preset time correlation feature includes:
converting the spectrum information from a frequency domain spectrum to a time domain spectrum;
based on the spectral information converted into the time domain spectrum, it is determined whether the first signal satisfies a preset time correlation characteristic.
In one possible implementation manner, determining whether the first signal meets the preset time correlation characteristic based on the spectrum information converted into the time domain spectrum includes:
determining a time correlation function of the first signal according to the frequency spectrum information converted into the time domain frequency spectrum;
determining a root mean square error between the time correlation function and a preset function;
and if the root mean square error between the time correlation function and the preset function is smaller than or equal to a first threshold value, determining that the first signal meets the preset time correlation characteristic.
In a second aspect, an embodiment of the present application provides a doppler spread verification system for a channel, including:
the acquisition module is used for acquiring spectrum information of a first signal, wherein the first signal is sent by a first channel;
the determining module is used for determining whether the first signal meets preset frequency spectrum characteristics or not;
the determining module is further configured to determine whether the first signal meets a preset time correlation characteristic;
the determining module is further configured to determine that the first channel passes doppler spread verification if the first signal meets a preset time correlation characteristic.
In a third aspect, an embodiment of the present application provides an electronic device, including:
at least one processor; and
at least one memory communicatively coupled to the processor, wherein:
the memory stores program instructions executable by the processor, the processor invoking the program instructions to perform the method of the first aspect.
In a fourth aspect, embodiments of the present application provide a computer-readable storage medium storing computer instructions that cause a computer to perform the method of the first aspect.
It should be understood that, the second to fourth aspects of the embodiments of the present application are similar to the advantages obtained by the aspects consistent with the technical solutions of the first aspect and the corresponding possible implementations of the embodiments of the present application, and are not described in detail.
[ description of the drawings ]
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a flowchart of a method for verifying doppler spread of a channel according to an embodiment of the present application;
fig. 2 is a flowchart of another method for verifying doppler spread of a channel according to an embodiment of the present application;
fig. 3 is a flowchart of another method for verifying doppler spread of a channel according to an embodiment of the present application;
fig. 4 is a schematic structural diagram of a system for verifying doppler spread of a channel according to an embodiment of the present application;
fig. 5 is a schematic structural diagram of another channel doppler spread verification system according to an embodiment of the present application;
fig. 6 is a schematic structural diagram of an electronic device according to an embodiment of the present application.
[ detailed description ] of the application
For a better understanding of the technical solutions of the present specification, the following detailed description of the embodiments of the present application refers to the accompanying drawings.
Fig. 1 is a method for verifying doppler spread of a channel according to an embodiment of the present application, as shown in fig. 1, where the method includes:
step 101, obtaining spectrum information of a first signal, where the first signal is sent by a first channel. When the Doppler spread of the first channel is verified, a spectrometer can be used for collecting signals passing through the first channel to obtain spectrum information of the first signal, and the first signal can be a single-frequency signal. In some embodiments, the first channel may be a channel obtained through simulation, and in particular, may be a simulation channel constructed through a MIMO OTA system.
Step 102, determining whether the first signal satisfies a preset spectral feature. The preset spectrum characteristic can be any one of a rectangular window template characteristic, a triangular window template characteristic, a hanning window template characteristic and a gaussian window template characteristic. Different template features can be selected according to different requirements to verify the frequency spectrum of the first signal. For example, in determining whether the first signal meets a preset spectral feature, a rectangular window template is employed for verification. Specifically, according to the spectrum information of the first signal, whether the first signal meets the rectangular window template features is determined, and if the first signal meets the rectangular window template features, the first signal is determined to meet the preset spectrum features.
In some embodiments, after the spectrum information of the first signal is obtained, for convenience of calculation, normalization processing may be performed on the spectrum information. The processing steps comprise: and carrying out normalization processing on the frequency spectrum information according to the maximum amplitude information in the frequency spectrum information. And determining whether the first signal meets preset spectrum characteristics or not based on the normalized spectrum information.
Step 103, if the first signal meets the preset spectrum characteristic, determining whether the first signal meets the preset time correlation characteristic. In some embodiments, since the spectral information is a relationship between the frequency and the amplitude of the first signal, the spectral information may be time-domain converted from a frequency-domain spectrum to a time-domain spectrum when determining whether the first signal satisfies a preset time correlation characteristic. And then determining whether the first signal meets the preset time correlation characteristic according to the frequency spectrum information converted into the time domain frequency spectrum. In some embodiments, the doppler spread verification may be performed on the channel by selecting a corresponding preset time correlation characteristic according to different verification requirements of different channels. Specifically, different preset time correlation thresholds may be determined according to different time correlation characteristics. Alternatively, the preset time correlation threshold may be in the form of a function. The actual frequency spectrum measured by the frequency spectrograph is converted into a time domain signal, and then the time domain signal is calculated with a preset time correlation function, so that whether the first signal meets the preset time correlation characteristic is determined.
Step 104, if the first signal meets the preset time correlation characteristic, determining that the first channel passes the Doppler spread verification.
In some embodiments, the step 102, the specific step of determining whether the first signal meets the preset spectrum characteristic is shown in fig. 2, and taking a rectangular window template as an example, the processing steps of the method include:
step 201, determining maximum frequency offset information of the first signal according to wavelength information and wave velocity information of the first signal. The maximum frequency offset information can be obtained by dividing the wave speed by the wavelength.
Step 202, determining a first frequency range and a non-first frequency range according to the maximum frequency offset information. Wherein the first frequency range may be-f m To f m Frequency f between m The maximum frequency offset information is obtained. The non-first frequency range is smaller than-f m And a frequency greater than f m Is a frequency range of (c).
Step 203, determining whether the amplitude information of the first signal in the first frequency range and the non-first frequency range meets the rectangular window template characteristic according to the frequency spectrum information. Specifically, the threshold information of the rectangular window template may be determined first, and then whether the amplitude information of the first signal in the first frequency range is greater than or equal to the threshold information of the rectangular window template may be determined according to the spectrum information of the first signal. And determining whether the amplitude information of the first signal in the non-first frequency range is smaller than or equal to the threshold information of the rectangular window template according to the frequency spectrum information of the first signal. If the amplitude information of the first signal in the first frequency range is greater than or equal to the threshold information of the rectangular window template and the amplitude information of the first signal in the non-first frequency range is less than or equal to the threshold information of the rectangular window template, it can be determined that the first signal meets the rectangular window template characteristics.
Step 204, if the amplitude information of the first signal in the first frequency range and the non-first frequency range both meet the rectangular window template feature, determining that the first signal meets the rectangular window template feature.
In some embodiments, the step 103 above, the processing step of determining whether the first signal satisfies the preset time correlation characteristic is shown in fig. 3.
Step 301, determining a time correlation function of the first signal according to the spectrum information converted into the time domain spectrum.
In step 302, a root mean square error between the time correlation function and the predetermined function is determined. The preset function may be a preset function of the time correlation function of the first channel, which is calculated by using the correlation parameter when the first channel is constructed, that is, a theoretical value of the time correlation function of the first channel. And determining whether the first signal satisfies the preset time correlation characteristic by calculating a root mean square error between an actual time correlation function of the first signal and the preset function.
In step 303, if the root mean square error between the time correlation function and the preset function is less than or equal to the first threshold, it is determined that the first signal satisfies the preset time correlation characteristic. The first threshold value can be selected to be different according to different test requirements.
In one specific example, the step of determining whether the first channel is verified by doppler spread is:
and acquiring spectrum information of a single-frequency signal after passing through a channel of the MIMO OTA system to be verified by using a spectrometer, wherein the spectrum information is marked as S (f), the abscissa of the spectrum information is frequency unit Hz, and the ordinate of the spectrum information is amplitude unit dBm. In order to facilitate calculation, the spectrum information can be converted into a scalar, optionally, the spectrum information can be normalized, and then the spectrum unit is converted into dB, so that the spectrum information is converted into the scalar which is convenient to calculate. Specifically, the method can be performed by the formula S' (f) =s (f) -S max (f) Normalization processing is carried out on the frequency spectrum information, and then the frequency spectrum information passes through the formula S' dB (f)＝10log 10 (S' (f)) unit-converts the spectrum information. Wherein S is max (f) Is the maximum amplitude value in the frequency spectrum information, S' dB (f) Namely, the frequency spectrum information which is normalized by calculation and subjected to unit conversion.
And then judging whether the frequency spectrum is full of the requirements of the rectangular window template. Specifically, the maximum frequency offset of the single frequency signal can be calculated according to the wavelength and wave velocity of the single frequency signal, and is marked as f m Then judging that the value of f is in the interval (-f) m ，f m ) At the time S' dB (f) Whether the value of f is greater than or equal to the threshold corresponding to the rectangular window template, and the value of f is less than or equal to-f m And f is greater than or equal to m In two intervals, S' dB (f) If the values of the spectrum information are smaller than or equal to the threshold corresponding to the rectangular window template, if the values of the spectrum information are all satisfied, the spectrum information can be determined to satisfy the requirement of the rectangular window template.
After determining that the spectrum information meets the requirement of the rectangular window template, calculating the spectrum information in the interval (-f) m ，f m ) Whether or not the time correlation function of (2) meets the requirement, firstly, for S' dB (f) In the interval (-f) m ，f m ) The function above is intercepted and marked as S dB (f) A. The application relates to a method for producing a fibre-reinforced plastic composite Then through formula S dB (t)＝IFFT(S dB (f) For S) dB (f) Performing fast Fourier transform to obtain frequency spectrum information converted into time domain signal, namely S dB (t). Finally through the formulaObtaining the spectrum in the interval (-f) m ，f m ) The time dependence function on (i.e., R (Δt)). Wherein (1)>Is S dB Conjugate operation of (t).
After obtaining the time correlation function of the single frequency signal, calculating the root mean square error between the time correlation function and the preset theoretical time correlation function, specifically, the root mean square error can be calculated by the formula And obtaining the root mean square error. Wherein ρ is RMSE The root mean square error is the root mean square error, and N is the number of measurements. R is R theoretical (t) is a preset theoretical time correlation function. Finally judging the obtained rho RMSE Whether the value is smaller than or equal to a preset threshold value. If ρ RMSE And if the channel is smaller than or equal to a preset threshold value, determining that the MIMO OTA system channel to be verified passes the Doppler spread verification.
Corresponding to the Doppler spread verification of the channel, the embodiment of the application provides a Doppler spread verification system of the channel, as shown in fig. 4, comprising: an acquisition module 401 and a determination module 402.
The obtaining module 401 is configured to obtain spectrum information of a first signal, where the first signal is sent by a first channel.
A determining module 402 is configured to determine whether the first signal meets a preset spectral characteristic.
The determining module 402 is further configured to determine whether the first signal satisfies a preset time correlation characteristic.
The determining module 402 is further configured to determine that the first channel passes the doppler spread verification if the first signal meets a preset time correlation characteristic.
The system for verifying doppler spread of a channel provided by the embodiment shown in fig. 4 may be used to implement the technical solutions of the method embodiments shown in fig. 1 to 3 in the present specification, and the principle and technical effects thereof may be further described with reference to the related descriptions in the method embodiments.
In some embodiments, as shown in fig. 5, the system further comprises: a processing module 403.
And the processing module 403 is configured to normalize the spectrum information according to the maximum amplitude information in the spectrum information.
The determining module 402 is further configured to determine whether the first signal meets a preset spectrum characteristic based on the normalized spectrum information.
In some embodiments, the determination module 402 is specifically configured to.
And determining whether the first signal meets the rectangular window template characteristic according to the spectrum information of the first signal.
And if the first signal meets the rectangular window template characteristics, determining that the first signal meets the preset frequency spectrum characteristics.
In some embodiments, the determining module 402 is specifically configured to:
and determining the maximum frequency offset information of the first signal according to the wavelength information and the wave velocity information of the first signal.
And determining a first frequency range and a non-first frequency range according to the maximum frequency deviation information.
And determining whether the amplitude information of the first signal in the first frequency range and the non-first frequency range meets the rectangular window template characteristic according to the frequency spectrum information.
And if the amplitude information of the first signal in the first frequency range and the amplitude information of the first signal in the non-first frequency range meet the rectangular window template characteristics, determining that the first signal meets the rectangular window template characteristics.
In some embodiments, the determining module 402 is specifically configured to:
and determining threshold information of the rectangular window template according to the characteristics of the rectangular window template.
And determining whether the amplitude information of the first signal in the first frequency range is greater than or equal to the threshold information according to the frequency spectrum information of the first signal.
And determining whether the amplitude information of the first signal in a non-first frequency range is smaller than or equal to the threshold information according to the frequency spectrum information of the first signal.
And if the amplitude information of the first signal in the first frequency range is larger than or equal to the threshold information and the amplitude information of the first signal in the non-first frequency range is smaller than or equal to the threshold information, determining that the first signal meets the rectangular window template characteristic.
In some embodiments, the determining module 402 is specifically configured to:
the spectral information is converted from a frequency domain spectrum to a time domain spectrum.
Based on the spectral information converted into the time domain spectrum, it is determined whether the first signal satisfies a preset time correlation characteristic.
In some embodiments, the determining module 402 is specifically configured to:
and determining a time correlation function of the first signal according to the frequency spectrum information converted into the time domain frequency spectrum.
And determining the root mean square error between the time correlation function and a preset function.
And if the root mean square error between the time correlation function and the preset function is smaller than or equal to a first threshold value, determining that the first signal meets the preset time correlation characteristic.
The system for verifying doppler spread of a channel provided by the embodiment shown in fig. 5 may be used to implement the technical solutions of the method embodiments shown in fig. 1 to 3 in the present specification, and the principle and technical effects thereof may be further described with reference to the related descriptions in the method embodiments.
FIG. 6 is a schematic structural diagram of an embodiment of an electronic device of the present application, as shown in FIG. 6, which may include at least one processor; and at least one memory communicatively coupled to the processor, wherein: the memory stores program instructions executable by the processor, and the processor invokes the program instructions to perform the method for verifying doppler spread of a channel according to the embodiment of the present application shown in fig. 1 to 3.
Fig. 6 shows a block diagram of an exemplary electronic device suitable for use in implementing embodiments of the application. The electronic device shown in fig. 6 is only an example and should not be construed as limiting the functionality and scope of use of the embodiments of the present application.
As shown in fig. 6, the electronic device is in the form of a general purpose computing device. Components of an electronic device may include, but are not limited to: one or more processors 610, a communication interface 620, and a memory 630, a communication bus 640 that connects the various system components (including the memory 630, the communication interface 620, and the processing unit 610).
Communication bus 640 represents one or more of several types of bus structures, including a memory bus or memory controller, a peripheral bus, an accelerated graphics port, a processor, or a local bus using any of a variety of bus architectures. By way of example, and not limitation, such architectures include industry Standard architecture (Industry Standard Architecture; hereinafter ISA) bus, micro channel architecture (Micro Channel Architecture; hereinafter MAC) bus, enhanced ISA bus, video electronics standards Association (Video Electronics Standards Association; hereinafter VESA) local bus, and peripheral component interconnect (Peripheral Component Interconnection; hereinafter PCI) bus.
Electronic devices typically include a variety of computer system readable media. Such media can be any available media that can be accessed by the electronic device and includes both volatile and nonvolatile media, removable and non-removable media.
Memory 630 may include computer system readable media in the form of volatile memory such as random access memory (Random Access Memory; hereinafter: RAM) and/or cache memory. The electronic device may further include other removable/non-removable, volatile/nonvolatile computer system storage media. Memory 630 may include at least one program product having a set (e.g., at least one) of program modules configured to carry out the functions of embodiments of the application.
A program/utility having a set (at least one) of program modules may be stored in the memory 630, such program modules include, but are not limited to, an operating system, one or more application programs, other program modules, and program data, each or some combination of which may include an implementation of a network environment. Program modules typically carry out the functions and/or methods of the embodiments described herein.
The processor 610 executes programs stored in the memory 630 to perform various functional applications and data processing, such as implementing the doppler verification method of the channel provided by the embodiments of the present application shown in fig. 1 to 3.
An embodiment of the present application provides a computer readable storage medium, where the computer readable storage medium stores computer instructions, where the computer instructions cause the computer to execute the method for verifying doppler spread of a channel provided in the embodiments shown in fig. 1 to 3.
Any combination of one or more computer readable media may be utilized as the above-described computer readable storage media. The computer readable medium may be a computer readable signal medium or a computer readable storage medium. The computer readable storage medium can be, for example, but not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or a combination of any of the foregoing. More specific examples (a non-exhaustive list) of the computer-readable storage medium would include the following: an electrical connection having one or more wires, a portable computer hard disk, a Random Access Memory (RAM), a Read Only Memory (ROM), an erasable programmable Read Only Memory (Erasable Programmable Read Only Memory; EPROM) or flash Memory, an optical fiber, a portable compact hard disk Read Only Memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing. In this document, a computer readable storage medium may be any tangible medium that can contain, or store a program for use by or in connection with an instruction execution system, apparatus, or device.
The computer readable signal medium may include a propagated data signal with computer readable program code embodied therein, either in baseband or as part of a carrier wave. Such a propagated data signal may take any of a variety of forms, including, but not limited to, electro-magnetic, optical, or any suitable combination of the foregoing. A computer readable signal medium may also be any computer readable medium that is not a computer readable storage medium and that can communicate, propagate, or transport a program for use by or in connection with an instruction execution system, apparatus, or device.
Program code embodied on a computer readable medium may be transmitted using any appropriate medium, including but not limited to wireless, wireline, optical fiber cable, RF, etc., or any suitable combination of the foregoing.
Computer program code for carrying out operations of the present application may be written in any combination of one or more programming languages, including an object oriented programming language such as Java, smalltalk, C ++ and conventional procedural programming languages, such as the "C" programming language or similar programming languages. The program code may execute entirely on the user's computer, partly on the user's computer, as a stand-alone software package, partly on the user's computer and partly on a remote computer or entirely on the remote computer or server. In the case of a remote computer, the remote computer may be connected to the user's computer through any kind of network, including a local area network (Local Area Network; hereinafter: LAN) or a wide area network (Wide Area Network; hereinafter: WAN), or may be connected to an external computer (for example, through the Internet using an Internet service provider).
The foregoing describes specific embodiments of the present disclosure. Other embodiments are within the scope of the following claims. In some cases, the actions or steps recited in the claims can be performed in a different order than in the embodiments and still achieve desirable results. In addition, the processes depicted in the accompanying figures do not necessarily require the particular order shown, or sequential order, to achieve desirable results. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present specification. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present specification, the meaning of "plurality" means at least two, for example, two, three, etc., unless explicitly defined otherwise.
Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing specific logical functions or steps of the process, and additional implementations are included within the scope of the preferred embodiment of the present specification in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the embodiments of the present specification.
Depending on the context, the word "if" as used herein may be interpreted as "at … …" or "at … …" or "in response to a determination" or "in response to detection". Similarly, the phrase "if determined" or "if detected (stated condition or event)" may be interpreted as "when determined" or "in response to determination" or "when detected (stated condition or event)" or "in response to detection (stated condition or event), depending on the context.
It should be noted that, the terminals in the embodiments of the present disclosure may include, but are not limited to, a personal Computer (Personal Computer; hereinafter referred to as a PC), a personal digital assistant (Personal Digital Assistant; hereinafter referred to as a PDA), a wireless handheld device, a Tablet Computer (Tablet Computer), a mobile phone, an MP3 display, an MP4 display, and the like.
In the several embodiments provided in this specification, it should be understood that the disclosed systems, apparatuses, and methods may be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative, e.g., the division of the elements is merely a logical function division, and there may be additional divisions when actually implemented, e.g., multiple elements or components may be combined or integrated into another system, or some features may be omitted or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be an indirect coupling or communication connection via some interfaces, devices or units, which may be in electrical, mechanical or other form.
In addition, each functional unit in each embodiment of the present specification may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit. The integrated units may be implemented in hardware or in hardware plus software functional units.
The integrated units implemented in the form of software functional units described above may be stored in a computer readable storage medium. The software functional unit is stored in a storage medium, and includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) or a Processor (Processor) to perform part of the steps of the methods described in the embodiments of the present specification. And the aforementioned storage medium includes: a usb disk, a removable hard disk, a Read-Only Memory (hereinafter referred to as ROM), a random access Memory (Random Access Memory) and various media capable of storing program codes such as a magnetic disk or an optical disk.
The foregoing description of the preferred embodiments is provided for the purpose of illustration only, and is not intended to limit the scope of the disclosure, since any modifications, equivalents, improvements, etc. that fall within the spirit and principles of the disclosure are intended to be included within the scope of the disclosure.
Claims (10)
1. A method for verifying doppler spread of a channel, comprising:
acquiring spectrum information of a first signal, wherein the first signal is sent by a first channel;
determining whether the first signal meets a preset spectrum characteristic;
if the first signal meets the preset frequency spectrum characteristic, determining whether the first signal meets a preset time correlation characteristic;
and if the first signal meets the preset time correlation characteristic, determining that the first channel passes the Doppler spread verification.
2. The method of claim 1, wherein prior to determining whether the first signal meets a preset spectral characteristic, the method further comprises:
normalizing the spectrum information according to the maximum amplitude information in the spectrum information;
and determining whether the first signal meets preset spectrum characteristics or not based on the normalized spectrum information.
3. The method of claim 2, wherein determining whether the first signal meets a preset spectral feature comprises:
determining whether the first signal meets a rectangular window template characteristic according to the spectrum information of the first signal;
and if the first signal meets the rectangular window template characteristics, determining that the first signal meets the preset frequency spectrum characteristics.
4. A method according to claim 3, wherein determining whether the first signal satisfies a rectangular window template feature based on spectral information of the first signal comprises:
determining maximum frequency offset information of the first signal according to the wavelength information and the wave velocity information of the first signal;
determining a first frequency range and a non-first frequency range according to the maximum frequency offset information;
determining whether the amplitude information of the first signal in the first frequency range and the non-first frequency range meets the rectangular window template characteristics according to the frequency spectrum information;
and if the amplitude information of the first signal in the first frequency range and the amplitude information of the first signal in the non-first frequency range meet the rectangular window template characteristics, determining that the first signal meets the rectangular window template characteristics.
5. The method of claim 4, wherein determining whether the amplitude information of the first signal in the first frequency range and the non-first frequency range both satisfies a rectangular window template characteristic based on the spectral information comprises:
determining threshold information of the rectangular window template according to the characteristics of the rectangular window template;
determining whether amplitude information of a first signal in a first frequency range is greater than or equal to the threshold information according to frequency spectrum information of the first signal;
determining whether amplitude information of a first signal in a non-first frequency range is smaller than or equal to the threshold information according to frequency spectrum information of the first signal;
and if the amplitude information of the first signal in the first frequency range is larger than or equal to the threshold information and the amplitude information of the first signal in the non-first frequency range is smaller than or equal to the threshold information, determining that the first signal meets the rectangular window template characteristic.
6. The method of claim 2, wherein determining whether the first signal satisfies a preset time correlation characteristic comprises:
converting the spectrum information from a frequency domain spectrum to a time domain spectrum;
based on the spectral information converted into the time domain spectrum, it is determined whether the first signal satisfies a preset time correlation characteristic.
7. The method of claim 6, wherein determining whether the first signal satisfies the predetermined time correlation characteristic based on the spectral information converted into the time domain spectrum comprises:
determining a time correlation function of the first signal according to the frequency spectrum information converted into the time domain frequency spectrum;
determining a root mean square error between the time correlation function and a preset function;
and if the root mean square error between the time correlation function and the preset function is smaller than or equal to a first threshold value, determining that the first signal meets the preset time correlation characteristic.
8. A system for doppler spread verification of a channel, comprising:
the acquisition module is used for acquiring spectrum information of a first signal, wherein the first signal is sent by a first channel;
the determining module is used for determining whether the first signal meets preset frequency spectrum characteristics or not;
the determining module is further configured to determine whether the first signal meets a preset time correlation characteristic;
the determining module is further configured to determine that the first channel passes doppler spread verification if the first signal meets a preset time correlation characteristic.
9. An electronic device, comprising:
at least one processor; and
at least one memory communicatively coupled to the processor, wherein:
the memory stores program instructions executable by the processor, the processor invoking the program instructions to perform the method of any of claims 1-7.
10. A non-transitory computer readable storage medium storing computer instructions that cause the computer to perform the method of any one of claims 1 to 7.
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