CN115189785B - Method, system and equipment for verifying Doppler spread of channel - Google Patents

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

Channel Doppler extension verification method, system and equipment

【Technical field】

The invention relates to the field of communications, and in particular to a channel Doppler spread verification method, system and equipment.

【Background technique】

In wireless communication technology, information interaction and data transmission are carried out between base stations and terminals through channels. When evaluating the channel performance between the base station and the terminal, the channel is often simulated and tested based on relevant channel parameters to determine the channel performance. In the existing technology, a multiple input multiple output over the air technology (Multiple Input Multiple Output Over The Air, MIMO OTA) test system is usually used to verify and test the channel model. Specifically, the test content includes: delay power spectrum verification, Doppler expansion verification, spatial correlation verification and cross-polarization ratio verification. Among them, when performing Doppler expansion verification, subjective judgment is often used to determine whether the Doppler expansion meets the theoretical requirements. Therefore, it is easy to cause inaccurate Doppler expansion verification caused by errors in subjective judgment.

[Content of the invention]

In order to solve the above problem, an embodiment of the present invention provides a channel Doppler spread verification method, which determines whether the first channel transmitting the first signal is by calculating and verifying the spectrum characteristics and time correlation characteristics of the first signal. Verified by Doppler expansion.

In a first aspect, an embodiment of the present invention provides a channel Doppler spread verification method, which includes:

Obtain spectrum information of the first signal, the first signal being sent by the first channel;

Determine whether the first signal satisfies preset spectrum characteristics;

If the first signal satisfies the preset spectrum characteristics, determine whether the first signal satisfies the preset time correlation characteristics;

If the first signal satisfies the preset time correlation characteristics, it is determined that the first channel passes the Doppler spread verification.

In the embodiment of the present invention, the spectrum characteristics are first verified based on the spectrum information of the first signal. When the first signal meets the preset spectrum characteristics, the time correlation of the first signal is then verified. When the first signal satisfies the preset time correlation characteristics, it is determined that the first signal passes the Doppler expansion verification. The embodiment of the present invention performs calculations based on spectrum information, and determines whether preset spectrum characteristics and time correlation characteristics are met based on the calculation results, thereby avoiding judgment errors or inaccurate verification caused by subjective judgments.

In one possible implementation, before determining whether the first signal satisfies preset spectrum characteristics, the method further includes:

Normalize the spectrum information according to the maximum amplitude information in the spectrum information;

Based on the normalized spectrum information, it is determined whether the first signal satisfies preset spectrum characteristics.

In one possible implementation, determining whether the first signal satisfies preset spectrum characteristics includes:

Determine whether the first signal satisfies the rectangular window template characteristics according to the spectrum information of the first signal;

If the first signal satisfies the rectangular window template characteristics, it is determined that the first signal satisfies the preset spectrum characteristics.

In one possible implementation, determining whether the first signal satisfies the rectangular window template characteristics according to the spectrum information of the first signal includes:

Determine the maximum frequency offset information of the first signal according to the wavelength information and wave speed information of the first signal;

Determine the first frequency range and the non-first frequency range according to the maximum frequency offset information;

According to the spectrum information, determine whether the amplitude information of the first signal in the first frequency range and the non-first frequency range both satisfy the rectangular window template characteristics;

If the amplitude information of the first signal in both the first frequency range and the non-first frequency range satisfies the rectangular window template characteristics, it is determined that the first signal satisfies the rectangular window template characteristics.

In one possible implementation, determining whether the amplitude information of the first signal in the first frequency range and the non-first frequency range satisfies the rectangular window template characteristics according to the spectrum information includes:

Determine threshold information of the rectangular window template according to the characteristics of the rectangular window template;

Determine 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 spectrum information of the first signal;

Determine whether the amplitude information of the first signal in the non-first frequency range is less than or equal to the threshold information according to the 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, and the amplitude information in the non-first frequency range is less than or equal to the threshold information, it is determined that the first signal satisfies the threshold information. Rectangular window template feature.

In one possible implementation, determining whether the first signal satisfies preset time correlation characteristics includes:

Convert the spectrum information from a frequency domain spectrum to a time domain spectrum;

Based on the spectrum information converted into the time domain spectrum, it is determined whether the first signal satisfies the preset time correlation characteristics.

In one possible implementation, based on the spectrum information converted into a time domain spectrum, it is determined whether the first signal satisfies the preset time correlation characteristics, including:

Determine the time correlation function of the first signal according to the spectrum information converted into a time domain spectrum;

Determine the root mean square error between the time correlation function and the preset function;

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.

In a second aspect, embodiments of the present invention provide a channel Doppler spread verification system, including:

An acquisition module, configured to acquire the spectrum information of the first signal, which is sent by the first channel;

Determining module, used to determine whether the first signal satisfies preset spectrum characteristics;

The determination module is also used to determine whether the first signal satisfies preset time correlation characteristics;

The determining module is also configured to determine that the first channel passes the Doppler spread verification if the first signal satisfies the preset time correlation characteristics.

In a third aspect, an embodiment of the present invention provides an electronic device, including:

at least one processor; and

at least one memory communicatively connected to the processor, wherein:

The memory stores program instructions that can be executed by the processor, and the processor can execute the method described in the first aspect by calling the program instructions.

In a fourth aspect, embodiments of the present invention provide a computer-readable storage medium that stores computer instructions, and the computer instructions cause the computer to execute the method described in the first aspect.

It should be understood that the second to fourth aspects of the embodiments of the present invention are consistent with the technical solutions of the first aspect of the embodiments of the present invention and have similar beneficial effects in all aspects and corresponding feasible implementations, and will not be described again.

[Picture description]

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some examples of the embodiments of the present invention. For those of ordinary skill in the art, other drawings can also be obtained based on these drawings without exerting creative efforts.

Figure 1 is a flow chart of a channel Doppler spread verification method provided by an embodiment of the present invention;

Figure 2 is a flow chart of another channel Doppler spread verification method provided by an embodiment of the present invention;

Figure 3 is a flow chart of another channel Doppler spread verification method provided by an embodiment of the present invention;

Figure 4 is a schematic structural diagram of a channel Doppler spread verification system provided by an embodiment of the present invention;

Figure 5 is a schematic structural diagram of another channel Doppler spread verification system provided by an embodiment of the present invention;

Figure 6 is a schematic structural diagram of an electronic device provided by an embodiment of the present invention.

【Detailed ways】

In order to better understand the technical solutions of this specification, the embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

Figure 1 is a channel Doppler spread verification method provided by an embodiment of the present invention. As shown in Figure 1, the method includes:

Step 101: Obtain spectrum information of a first signal sent through a first channel. When verifying the Doppler spread of the first channel, a spectrum analyzer can be used to collect signals passing through the first channel to obtain spectrum information of the first signal. The optional first signal can be a single-frequency signal. In some embodiments, the first channel may be a channel obtained through simulation. Specifically, it may be a simulated channel constructed through a MIMO OTA system.

Step 102: Determine whether the first signal satisfies preset spectrum characteristics. Wherein, the preset spectrum features may be any one of rectangular window template features, triangular window template features, Hanning window template features, Haining window template features and Gaussian window template features. Different template features can be selected according to different requirements to verify the spectrum of the first signal. For example, when determining whether the first signal satisfies the preset spectrum characteristics, a rectangular window template is used for verification. Specifically, first, based on the spectrum information of the first signal, it is determined whether the first signal satisfies the rectangular window template characteristics. If the first signal satisfies the rectangular window template characteristics, it is determined that the first signal satisfies the preset spectrum characteristics.

In some embodiments, after obtaining the spectrum information of the first signal, in order to facilitate calculation, the spectrum information may be normalized. The processing steps include: normalizing the spectrum information according to the maximum amplitude information in the spectrum information. Based on the normalized spectrum information, it is determined whether the first signal satisfies the preset spectrum characteristics.

Step 103: If the first signal satisfies the preset spectrum characteristics, determine whether the first signal satisfies the preset time correlation characteristics. In some embodiments, since the spectrum information is the relationship curve between the frequency and amplitude of the first signal, when determining whether the first signal satisfies the preset time correlation characteristics, the spectrum information can be linearly converted to the time domain, and Spectral information is converted from frequency domain spectrum to time domain spectrum. Then, based on the spectrum information converted into the time domain spectrum, it is determined whether the first signal satisfies the preset time correlation characteristics. In some embodiments, according to different verification requirements of different channels, corresponding preset time correlation characteristics can be selected to perform Doppler spread verification on the channel. Specifically, different preset time correlation thresholds can be determined according to different time correlation characteristics. Optionally, the preset time correlation threshold can be in the form of a function. After converting the actual spectrum measured by the spectrum analyzer into a time domain signal, it is calculated with a preset time correlation function to determine whether the first signal satisfies the preset time correlation characteristics.

Step 104: If the first signal satisfies the preset time correlation characteristics, determine that the first channel passes the Doppler spread verification.

In some embodiments, the above-mentioned step 102, the specific steps of determining whether the first signal satisfies the preset spectrum characteristics are shown in Figure 2. Taking the rectangular window template as an example, the processing steps of the above-mentioned method include:

Step 201: Determine the maximum frequency offset information of the first signal based on the wavelength information and wave speed information of the first signal. Among them, the maximum frequency deviation information can be obtained by dividing the wave speed by the wavelength.

Step 202: Determine the first frequency range and the non-first frequency range based on the maximum frequency offset information. Wherein, the first frequency range may be a frequency between -f _m and f _m , where f _m is the maximum frequency offset information. The non-first frequency range is the frequency range less than -f _m and the frequency greater than f _m .

Step 203: Determine whether the amplitude information of the first signal in the first frequency range and the non-first frequency range satisfies the rectangular window template characteristics based on the spectrum information. Specifically, the threshold information of the rectangular window template may be determined first, and then it may be determined based on the spectrum information of the first signal 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. and determining whether 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 according to the 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 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 satisfies the rectangular shape. Window template features.

Step 204: If the amplitude information of the first signal in both the first frequency range and the non-first frequency range satisfies the rectangular window template characteristics, it is determined that the first signal satisfies the rectangular window template characteristics.

In some embodiments, the above-mentioned step 103, the processing step of determining whether the first signal satisfies the preset time correlation characteristics is as shown in Figure 3.

Step 301: Determine the time correlation function of the first signal based on the spectrum information converted into a time domain spectrum.

Step 302: Determine the root mean square error between the time correlation function and the preset function. The preset function may be a preset function about the time correlation function of the first channel calculated using the relevant parameters when constructing the first channel, that is, the theoretical value of the time correlation function of the first channel. And determining whether the first signal satisfies the preset time correlation characteristics by calculating the root mean square error between the actual time correlation function of the first signal and the preset function.

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 characteristics. Among them, the first threshold can select different values according to different test requirements.

In a specific example, the steps for determining whether the first channel passes the Doppler spread verification are:

Use a spectrum analyzer to collect the spectrum information of the single-frequency signal after passing through the MIMO OTA system channel to be verified, denoted as S(f). The abscissa of the spectrum information is frequency in Hz, and the ordinate is amplitude in dBm. In order to facilitate calculation, the spectrum information can be converted into a scalar first. Optionally, the spectrum information can be normalized, and then the spectrum unit can be converted into dB, thereby converting the spectrum information into a scalar that is easy to calculate. Specifically, the spectrum information can be normalized through the formula S′(f)=S(f)-S _max (f), and then the formula S′ _dB (f)=10log ₁₀ (S′(f) ) performs unit conversion on spectrum information. Among them, S _max (f) is the maximum amplitude value in the spectrum information, and S′ _dB (f) is the calculated spectrum information after normalization and unit conversion.

Then determine whether the spectrum satisfies the requirements of the rectangular window template. Specifically, the maximum frequency deviation of the single-frequency signal can be calculated first based on the wavelength and wave speed of the single-frequency signal, recorded as f _m , and then it is judged that when the value of f is in the interval (-f _m , f _m ), S′ _dB Whether the value of (f) is greater than or equal to the threshold corresponding to the rectangular window template, and when the value of f is in the two intervals of less than or equal to -f _m and greater than or equal to f _m , whether the value of S′ _dB (f) is less than or equal to the rectangle If the thresholds corresponding to the window template are all met, it can be determined that the spectrum information meets the requirements of the rectangular window template.

After determining that the spectrum information meets the requirements of the rectangular window template, in order to calculate whether the time correlation function of the spectrum information in the interval (-f _m , f _m ) meets the requirements, first, S′ _dB (f) in the interval (-f m , f _m , The function on f _m ) is intercepted and recorded as S _dB (f). Then the fast inverse Fourier transform is performed on S _{dB (f) through the formula S dB (} t) = IFFT (S _dB (f)) to obtain the spectrum information converted into a time domain signal, that is, S _dB (t). Finally, through the formula The time correlation function of the spectrum in the interval (-f _m , f _m ) is obtained, that is, R(Δt). Among them,/> is the conjugate operation of S _dB (t).

After obtaining the time correlation function of the single-frequency signal, calculate the root mean square error between the time correlation function and the preset theoretical time correlation function. Specifically, the formula can be used The root mean square error is obtained. Among them, ρ _RMSE is the root mean square error, and N is the number of measurements. R _theoretical (t) is the preset theoretical time correlation function. Finally, it is judged whether the obtained ρ _RMSE is less than or equal to the preset threshold. If ρ _RMSE is less than or equal to the preset threshold, it can be determined that the MIMO OTA system channel to be verified passes the Doppler spread verification.

Corresponding to the Doppler extension verification of the above channel, an embodiment of the present invention provides a channel Doppler extension verification system. As shown in Figure 4, the system includes: an acquisition module 401 and a determination module 402.

The acquisition module 401 is used to acquire the spectrum information of the first signal, which is sent by the first channel.

Determining module 402, used to determine whether the first signal satisfies preset spectrum characteristics.

The determination module 402 is also used to determine whether the first signal satisfies preset time correlation characteristics.

The determining module 402 is also configured to determine that the first channel passes the Doppler spread verification if the first signal satisfies the preset time correlation characteristics.

The channel Doppler spread verification system provided by the embodiment shown in Figure 4 can be used to implement the technical solutions of the method embodiments shown in Figures 1 to 3 of this specification. For its implementation principles and technical effects, you can further refer to the relevant methods in the method embodiments. describe.

In some embodiments, as shown in Figure 5, the system further includes: a processing module 403.

The processing module 403 is configured to normalize the spectrum information according to the maximum amplitude information in the spectrum information.

The determination module 402 is also configured to determine whether the first signal satisfies preset spectrum characteristics based on the normalized spectrum information.

In some embodiments, the determining module 402 is specifically used.

According to the spectrum information of the first signal, it is determined whether the first signal satisfies the rectangular window template characteristics.

If the first signal satisfies the rectangular window template characteristics, it is determined that the first signal satisfies the preset spectrum characteristics.

In some embodiments, the determining module 402 is specifically used to:

According to the wavelength information and wave speed information of the first signal, the maximum frequency deviation information of the first signal is determined.

According to the maximum frequency offset information, a first frequency range and a non-first frequency range are determined.

According to the spectrum information, it is determined whether the amplitude information of the first signal in the first frequency range and the non-first frequency range both satisfy the rectangular window template characteristics.

If the amplitude information of the first signal in both the first frequency range and the non-first frequency range satisfies the rectangular window template characteristics, it is determined that the first signal satisfies the rectangular window template characteristics.

In some embodiments, the determining module 402 is specifically used to:

According to the characteristics of the rectangular window template, the threshold information of the rectangular window template is determined.

Determine 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 spectrum information of the first signal.

Determine whether the amplitude information of the first signal in the non-first frequency range is less than or equal to the threshold information according to the 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, and the amplitude information in the non-first frequency range is less than or equal to the threshold information, it is determined that the first signal satisfies the threshold information. Rectangular window template feature.

In some embodiments, the determining module 402 is specifically used to:

The spectrum information is converted from a frequency domain spectrum to a time domain spectrum.

Based on the spectrum information converted into the time domain spectrum, it is determined whether the first signal satisfies the preset time correlation characteristics.

In some embodiments, the determining module 402 is specifically used to:

According to the spectrum information converted into a time domain spectrum, a time correlation function of the first signal is determined.

The root mean square error between the time correlation function and the preset function is determined.

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 channel Doppler spread verification system provided by the embodiment shown in Figure 5 can be used to implement the technical solutions of the method embodiments shown in Figures 1 to 3 of this specification. For its implementation principles and technical effects, you can further refer to the relevant methods in the method embodiments. describe.

Figure 6 is a schematic structural diagram of an embodiment of an electronic device of the present invention. As shown in Figure 6, the electronic device may include at least one processor; and at least one memory communicatively connected to the processor, wherein: the memory stores information that can be processed The program instructions executed by the processor, and the above-mentioned processor calls the above-mentioned program instructions to execute the Doppler spread verification method of the channel provided by the embodiments shown in FIGS. 1 to 3 of the present invention.

Figure 6 shows a block diagram of an exemplary electronic device suitable for implementing embodiments of the invention. The electronic device shown in FIG. 6 is only an example and should not impose any restrictions on the functions and usage scope of the embodiments of the present application.

As shown in Figure 6, the electronic device takes the form of a general computing device. The components of the electronic device may include, but are not limited to: one or more processors 610, communication interfaces 620, and memory 630, and a communication bus 640 connecting different system components (including memory 630, communication interface 620, and processing unit 610).

Communications bus 640 represents one or more of several types of bus structures, including a memory bus or memory controller, a peripheral bus, a graphics accelerated port, a processor, or a local bus using any of a variety of bus structures. For example, these architectures include but are not limited to the Industry Standard Architecture (Industry Standard Architecture; hereinafter referred to as: ISA) bus, Micro Channel Architecture (Micro Channel Architecture; hereinafter referred to as: MAC) bus, enhanced ISA bus, and video electronic standards Association (Video Electronics Standards Association; hereafter referred to as: VESA) local bus and peripheral component interconnection (Peripheral Component Interconnection; hereafter referred to as: PCI) bus.

Electronic devices typically include a variety of computer system readable media. These media can be any available media that can be accessed by an electronic device, including volatile and nonvolatile media, removable and non-removable media.

The memory 630 may include computer system readable media in the form of volatile memory, such as random access memory (Random Access Memory; hereinafter referred to as: RAM) and/or cache memory. Electronic devices may further include other removable/non-removable, volatile/non-volatile computer system storage media. The memory 630 may include at least one program product having a set of (eg, at least one) program modules configured to perform the functions of various embodiments of the present application.

A program/utility having a set of (at least one) program modules, including but not limited to an operating system, one or more application programs, other program modules, and program data, may be stored in memory 630 , each of these examples or some combination may include the implementation of a network environment. Program modules typically perform functions and/or methods in the embodiments described herein.

The processor 610 executes programs stored in the memory 630 to perform various functional applications and data processing, for example, implementing the channel Doppler verification method provided by the embodiments shown in FIGS. 1 to 3 of the present application.

Embodiments of the present application provide a computer-readable storage medium. The computer-readable storage medium stores computer instructions. The computer instructions cause the computer to execute the multi-channel multi-channel processing provided by the embodiments shown in FIGS. 1 to 3 of the present application. Le extended authentication method.

The above computer-readable storage medium may be any combination of one or more computer-readable media. The computer-readable medium may be a computer-readable signal medium or a computer-readable storage medium. The computer-readable storage medium may be, for example, but is not limited to, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus or device, or any combination thereof. More specific examples (non-exhaustive list) of computer-readable storage media include: an electrical connection having one or more conductors, a portable computer hard drive, a hard disk, random access memory (RAM), read-only memory (ReadOnly Memory; (hereinafter referred to as: ROM), Erasable Programmable ReadOnly Memory (Erasable Programmable ReadOnly Memory (hereinafter referred to as: EPROM)) or flash memory, optical fiber, portable compact hard disk read-only memory (CD-ROM), optical storage devices, magnetic storage devices, Or any suitable combination of the above. As used herein, a computer-readable storage medium may be any tangible medium that contains or stores a program for use by or in connection with an instruction execution system, apparatus, or device.

A computer-readable signal medium may include a data signal propagated in baseband or as part of a carrier wave carrying computer-readable program code therein. Such propagated data signals may take a variety of forms, including - but not limited to - electromagnetic signals, optical signals, or any suitable combination of the above. A computer-readable signal medium may also be any computer-readable medium other than a computer-readable storage medium that can send, propagate, or transmit 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 performing operations of the present application may be written in one or more programming languages, including object-oriented programming languages such as Java, Smalltalk, C++, and conventional Procedural programming language—such as "C" or a similar programming language. 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 involving a remote computer, the remote computer can be connected to the user's computer through any kind of network - including a Local Area Network (Local Area Network; hereinafter referred to as: LAN) or a Wide Area Network (hereinafter referred to as: WAN), or can be connected to an external computer (such as using an Internet service provider to connect via the Internet).

The foregoing describes specific embodiments of this specification. Other embodiments are within the scope of the appended 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 desired results. Additionally, the processes depicted in the figures do not necessarily require the specific order shown, or sequential order, to achieve desirable results. Multitasking and parallel processing are also possible or may be advantageous in certain implementations.

In the description of this specification, reference to the terms "one embodiment," "some embodiments," "an example," "specific examples," or "some examples" or the like means that specific features are described in connection with the embodiment or example. , structures, materials or features are included in at least one embodiment or example of this specification. In this specification, the schematic expressions of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the specific features, structures, materials or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, those skilled in the art may combine and combine different embodiments or examples and features of different embodiments or examples described in this specification unless they are inconsistent with each other.

In addition, the terms “first” and “second” are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of indicated technical features. Therefore, features defined as "first" and "second" may explicitly or implicitly include at least one of these features. In the description of this specification, "plurality" means at least two, such as two, three, etc., unless otherwise clearly and specifically limited.

Any process or method descriptions in flowcharts or otherwise described herein may be understood to represent modules, segments, or portions of code that include one or more executable instructions for implementing customized logical functions or steps of the process. , and the scope of the preferred embodiments of this description includes additional implementations in which functions may be performed out of the order shown or discussed, including in a substantially simultaneous manner or in the reverse order, depending on the functionality involved, which shall It should be understood by those skilled in the art to which the embodiments of this specification belong.

Depending on the context, the word "if" as used herein may be interpreted as "when" or "when" or "in response to determination" or "in response to detection." Similarly, depending on the context, the phrase "if determined" or "if (stated condition or event) is detected" may be interpreted as "when determined" or "in response to determining" or "when (stated condition or event) is detected )" or "in response to detecting (a stated condition or event)".

It should be noted that the terminals involved in the embodiments of this specification may include but are not limited to personal computers (Personal Computer; hereinafter referred to as: PC), personal digital assistants (Personal Digital Assistant; hereinafter referred to as: PDA), wireless handheld devices, tablets Computers (Tablet Computers), mobile phones, MP3 monitors, MP4 monitors, etc.

In the several embodiments provided in this specification, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are only illustrative. For example, the division of the units is only a logical function division. In actual implementation, there may be other division methods. For example, multiple units or components may be combined. Either it can be integrated into another system, or some features can be ignored, or not implemented. On the other hand, the coupling or direct coupling or communication connection between each other shown or discussed may be through some interfaces, and the indirect coupling or communication connection of the devices or units may be in electrical, mechanical or other forms.

In addition, each functional unit in each embodiment of this specification may be integrated into one processing unit, or each unit may exist physically alone, or two or more units may be integrated into one unit. The above integrated unit can be implemented in the form of hardware or in the form of hardware plus software functional units.

The above-mentioned integrated unit implemented in the form of a software functional unit can be stored in a computer-readable storage medium. The above-mentioned software functional unit is stored in a storage medium and includes a number of instructions to cause a computer device (which can be a personal computer, server, or network device, etc.) or processor (Processor) to execute the methods described in various embodiments of this specification. Some steps. The aforementioned storage media include: U disk, mobile hard disk, read-only memory (Read-Only Memory; hereinafter referred to as: ROM), random access memory (Random Access Memory; hereinafter referred to as: RAM), magnetic disks or optical disks, etc. A medium on which program code can be stored.

The above are only preferred embodiments of this specification and are not intended to limit this specification. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of this specification shall be included in this specification. within the scope of protection.

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.