CN111565081A - Method, medium, terminal and device for scanning white spectrum frequency band in cognitive radio - Google Patents
Method, medium, terminal and device for scanning white spectrum frequency band in cognitive radio Download PDFInfo
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- CN111565081A CN111565081A CN202010349583.4A CN202010349583A CN111565081A CN 111565081 A CN111565081 A CN 111565081A CN 202010349583 A CN202010349583 A CN 202010349583A CN 111565081 A CN111565081 A CN 111565081A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/30—Monitoring; Testing of propagation channels
- H04B17/382—Monitoring; Testing of propagation channels for resource allocation, admission control or handover
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N17/00—Diagnosis, testing or measuring for television systems or their details
- H04N17/04—Diagnosis, testing or measuring for television systems or their details for receivers
- H04N17/045—Self-contained testing apparatus
Abstract
The invention discloses a method, a medium, a terminal and a device for scanning a white spectrum frequency band in cognitive radio, wherein the method comprises the following steps: acquiring a white spectrum of a target time and a target place, and establishing and initializing a scanning probability table; and carrying out continuous N times of detection on each frequency band in the scanning probability table, calculating the proportion of each frequency band which is an effective frequency band in the continuous N times of detection, and updating the scanning probability of each frequency band according to the proportion. The invention automatically skips the frequency band with lower scanning probability, namely lower validity probability by continuously updating the scanning probability of each frequency band in the scanning probability table, thereby achieving the purpose of fast scanning, reducing the integral scanning time, improving the integral scanning efficiency, and not reducing the detection reliability while reducing the integral scanning time.
Description
[ technical field ] A method for producing a semiconductor device
The invention relates to the field of cognitive radio, in particular to a method, a medium, a terminal and a device for scanning a white spectrum frequency band in cognitive radio.
[ background of the invention ]
In recent years, the worldwide unlimited communication service has been rapidly increased, which makes the spectrum resources available for wireless communication more and more scarce, and the problem of insufficient spectrum resources is more and more serious. How to utilize the existing spectrum resources to the maximum extent under the condition of limited wireless spectrum resources, and improving the spectrum utilization rate becomes the problem to be solved urgently at present. According to a part of survey reports, the utilization rate of VHF and UHF authorized bands originally used for television broadcasting is low and is often idle, and the part of broadcast television bands which are idle in certain geographic positions and certain time is called broadcast television white spectrum (hereinafter referred to as white spectrum), and specifically includes spectrum which is not allocated by a manager, spectrum which is allocated but not used or not fully used, and guard bands between adjacent channels, and the like. When using white spectrum for communication, firstly, the problem of spectrum sensing needs to be solved, that is, at a target time and a target place, a radio device is used for sensing and monitoring whether different frequency bands are occupied, so as to acquire an idle channel. In the sensing process of the prior art, the receiver needs to scan the broadcast television frequency band continuously, that is, all channel signals in the frequency band are repeatedly detected to judge which channels bear the signals, so that the scanning time is long, the scanning efficiency is low, the load of the receiver is increased, and the utilization efficiency of idle channels is reduced.
[ summary of the invention ]
The invention provides a method, a medium, a terminal and a device for scanning a white spectrum frequency band in cognitive radio, which solve the technical problems of long scanning time of the white spectrum frequency band, low scanning efficiency and high load of a receiver.
The technical scheme for solving the technical problems is as follows: a method for scanning white spectrum frequency bands in cognitive radio comprises the following steps:
step 1, acquiring a white spectrum of a target time and a target place by adopting a preset spectrum sensing method, and establishing a scanning probability table, wherein the scanning probability table comprises all frequency bands of the white spectrum;
step 2, initializing the scanning probability of each frequency band in the scanning probability table;
step 3, performing continuous N-time detection on each frequency band in the scanning probability table, calculating the proportion of each frequency band which is an effective frequency band in the continuous N-time detection, increasing the scanning probability of the corresponding frequency band in the scanning probability table when the proportion is larger than a first preset value, reducing the scanning probability of the corresponding frequency band in the scanning probability table when the proportion is smaller than a second preset value, marking the frequency band of which the scanning probability is smaller than a third preset value in the scanning probability table as a failure frequency band and neglecting the failure frequency band in the next scanning process; and the value of N is more than 1.
In a preferred embodiment, the method further comprises a step 4, wherein the step 4 specifically comprises: and taking the frequency band with the scanning probability larger than a fourth preset value in the scanning probability table as a preferred frequency band.
In a preferred embodiment, the method further comprises a step 5, wherein the step 5 specifically comprises: recording the failure time of each failure frequency band, calculating the failure time corresponding to each failure frequency band, adding the failure frequency band serving as a frequency band to be activated into the scanning probability table when the failure time reaches a fifth preset value, judging whether the frequency band to be activated is effective in the next scanning process, if so, setting the scanning probability of the frequency band to be activated as the third preset value, and if not, deleting the frequency band to be activated in the scanning probability table, and updating the deleting time as the new failure time.
In a preferred embodiment, the determining that the frequency band is the effective frequency band specifically includes: and detecting each frequency band in the scanning probability table, judging whether the frequency band is an idle frequency band, if so, calculating the packet error rate of receiving preset data through the idle frequency band, and when the packet error rate is less than a sixth preset value, judging that the corresponding frequency band is an effective frequency band.
In a preferred embodiment, if no valid frequency band with a ratio greater than the first preset value is detected for a predetermined number of consecutive times, the scanning probability of each frequency band in the scanning probability table is reinitialized, and step 3 is performed.
In a preferred embodiment, the preset spectrum sensing method for acquiring the white spectrum of the target time and the target location is any one or more of an energy detection method, a matched filter detection method, a cyclostationary feature detection method, a local oscillator leakage power detection method, and an interference temperature-based detection method.
A second aspect of the embodiments of the present invention provides a computer-readable storage medium, which stores a computer program, and when the computer program is executed by a processor, the computer program implements the above-mentioned method for scanning a white spectrum frequency band in a cognitive radio.
A third aspect of the embodiments of the present invention provides a terminal for scanning a white spectrum band in a cognitive radio, including the computer-readable storage medium and a processor, where the processor implements the steps of the above method for scanning a white spectrum band in a cognitive radio when executing a computer program on the computer-readable storage medium.
A fourth aspect of the embodiments of the present invention provides a scanning apparatus for white spectrum bands in cognitive radio, including an establishing module, an initializing module, and an updating module,
the establishing module is used for acquiring a white spectrum of a target time and a target place by adopting a preset spectrum sensing method and establishing a scanning probability table, wherein the scanning probability table comprises all frequency bands of the white spectrum;
the initialization module is used for initializing the scanning probability of each frequency band in the scanning probability table;
the updating module is used for carrying out continuous N-time detection on each frequency band in the scanning probability table, calculating the proportion of each frequency band which is an effective frequency band in the continuous N-time detection, increasing the scanning probability of the corresponding frequency band in the scanning probability table when the proportion is larger than a first preset value, reducing the scanning probability of the corresponding frequency band in the scanning probability table when the proportion is smaller than a second preset value, marking the frequency band of which the scanning probability is smaller than a third preset value in the scanning probability table as a failure frequency band and neglecting the failure frequency band in the next scanning process; and the value of N is more than 1.
In a preferred embodiment, the scanning device further includes an activation module, where the activation module is specifically configured to record a failure time of each failure frequency band, and calculate a failure duration corresponding to each failure frequency band, when the failure duration reaches a fifth preset value, add the failure frequency band as a to-be-activated frequency band to the scanning probability table, and determine whether the to-be-activated frequency band is valid in a next scanning process, if so, set the scanning probability of the to-be-activated frequency band to the third preset value, otherwise, delete the to-be-activated frequency band in the scanning probability table, and update the deletion time to a new failure time.
In a preferred embodiment, the scanning apparatus further includes a preferred module, and the preferred module is configured to use a frequency band in the scanning probability table, where the scanning probability is greater than a fourth preset value, as the preferred frequency band.
In a preferred embodiment, the updating module includes a calculating unit, and the calculating unit is configured to detect each frequency band in the scan probability table, determine whether the frequency band is an idle frequency band, if so, calculate a packet error rate of receiving preset data through the idle frequency band, and determine that the corresponding frequency band is an effective frequency band when the packet error rate is smaller than a sixth preset value.
In a preferred embodiment, the initialization module is specifically configured to reinitialize the scanning probability of each frequency band in the scanning probability table if no valid frequency band with a ratio greater than a first preset value is detected for a predetermined number of consecutive times.
The invention provides a method, a medium, a terminal and a device for scanning white spectrum frequency bands in cognitive radio, which automatically skip frequency bands with lower scanning probability, namely lower validity probability by continuously updating the scanning probability of each frequency band in a scanning probability table, thereby achieving the purpose of rapid scanning, reducing the whole scanning time, improving the whole scanning efficiency, lightening the load of a receiver, and not reducing the detection reliability while reducing the whole scanning time.
In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.
[ description of the drawings ]
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 is a schematic flowchart of a scanning method for white spectrum bands in cognitive radio according to embodiment 1;
fig. 2 is a schematic structural diagram of a scanning apparatus for white spectrum bands in cognitive radio provided in embodiment 2;
fig. 3 is a schematic structural diagram of a terminal for scanning white spectrum bands in cognitive radio according to embodiment 3.
[ detailed description ] embodiments
In order to make the objects, technical solutions and advantageous effects of the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and the detailed description. It should be understood that the detailed description and specific examples, while indicating the preferred embodiment of the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention.
Fig. 1 is a schematic flowchart of a scanning method for white spectrum bands in cognitive radio according to embodiment 1, and as shown in fig. 1, the scanning method includes the following steps:
step 1, acquiring a white spectrum of a target time and a target place by adopting a preset spectrum sensing method, and establishing a scanning probability table, wherein the scanning probability table comprises all frequency bands of the white spectrum. In a specific embodiment, the white spectrum may be sensed by using a plurality of methods, such as an energy detection method, a matched filter detection method, a cyclostationary feature detection method, a local oscillator leakage power detection method, and a detection method based on interference temperature, and the specific processes of these methods are described in the existing literature and will not be described in detail herein.
Then, step 2 is executed to initialize the scanning probability of each frequency band in the scanning probability table, for example, the scanning probability of each frequency band is assigned to 0 or a same integer. In other embodiments, spectrum allocation data that the network terminal allocates the idle spectrum at the target location in the latest time range and communication effect (such as interference) data that the cognitive radio device performs communication using the idle spectrum may also be obtained, and the scan probability table is established and initialized through the data, that is, all the idle spectrums in the latest time range are obtained through the spectrum allocation data, and the scan probability assignment is performed on the idle spectrums through the communication effect data, so that the better the communication effect is, the higher the corresponding scan probability assignment is. Thus, the larger the scanning probability value in the scanning probability table is, the higher the probability that the frequency band is represented as an effective frequency band at the moment is, and the more possible frequency band is used by the current cognitive radio device.
And then, executing step 3, performing continuous N-time detection on each frequency band in the scanning probability table, wherein the value of N is greater than 1, calculating the proportion of each frequency band which is an effective frequency band in the continuous N-time detection, increasing the scanning probability of the corresponding frequency band in the scanning probability table when the proportion is greater than a first preset value, reducing the scanning probability of the corresponding frequency band in the scanning probability table when the proportion is less than a second preset value, marking the frequency band of which the scanning probability is less than a third preset value in the scanning probability table as a failure frequency band, and ignoring the failure frequency band in the next scanning process. The first preset value, the second preset value, the third preset value, the increased value of the scanning probability and the decreased value of the scanning probability are set through a priori learning method. The first preset value, the second preset value, the third preset value, the added value and the reduced value are used for controlling the sensitivity of the frequency band change information in the whole scanning process, and the larger the added value and the reduced value are, the faster the scanning response to the frequency band change information is.
In a preferred embodiment, the method for scanning a white spectrum frequency band in cognitive radio further includes step 4, specifically: and taking the frequency band with the scanning probability larger than a fourth preset value in the scanning probability table as a preferred frequency band. In another preferred embodiment, the method for scanning a white spectrum frequency band in cognitive radio further includes step 5, where step 5 specifically includes: recording the failure time of each failure frequency band, calculating the failure time corresponding to each failure frequency band, adding the failure frequency band serving as a frequency band to be activated into the scanning probability table when the failure time reaches a fifth preset value, judging whether the frequency band to be activated is effective in the next scanning process, if so, setting the scanning probability of the frequency band to be activated as the third preset value, and if not, deleting the frequency band to be activated in the scanning probability table, and updating the deleting time as the new failure time. This is because the fast scan increases the scanning speed by skipping the frequency bands with less effective probability, and therefore, the detection of these frequency bands needs to be minimized; however, these invalid bands cannot be skipped forever, so that it is necessary to give certain authority to these invalid bands at appropriate time to ensure that the present invention does not cause the reduction of detection reliability while reducing the overall scanning time.
In another preferred embodiment, the determining the frequency band as the effective frequency band specifically includes: and detecting each frequency band in the scanning probability table, judging whether the frequency band is an idle frequency band, if so, calculating the packet error rate of receiving preset data through the idle frequency band, and when the packet error rate is less than a sixth preset value, judging that the corresponding frequency band is an effective frequency band. And only when the packet error rate meets a preset value, the interference is small, so that the frequency band is considered as an effective frequency band which can be used.
In order to ensure the reliability of the overall detection, if the effective frequency bands with the ratio greater than the first preset value are not detected for a predetermined number of times, the scanning probability of each frequency band in the scanning probability table needs to be reinitialized, that is, all the frequency bands are scanned again and the scanning probability is updated. The predetermined number of times in this step may take any of three or more values.
It should be understood that, the sequence numbers of the steps in the foregoing embodiments do not imply an execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation to the implementation process of the embodiments of the present invention.
An embodiment of the present invention further provides a computer-readable storage medium, which stores a computer program, and when the computer program is executed by a processor, the method for scanning a white spectrum frequency band in a cognitive radio is implemented.
Fig. 2 is a schematic structural diagram of a scanning apparatus for white spectrum bands in cognitive radio according to embodiment 2, as shown in fig. 2, including a setup module 100, an initialization module 200, and an update module 300,
the establishing module 100 is configured to acquire a white spectrum of a target time and a target location by using a preset spectrum sensing method, and establish a scanning probability table, where the scanning probability table includes all frequency bands of the white spectrum;
the initialization module 200 is configured to initialize a scanning probability of each frequency band in the scanning probability table;
the updating module 300 is configured to perform N consecutive detections on each frequency band in the scanning probability table, calculate a ratio of each frequency band being an effective frequency band in the N consecutive detections, increase a scanning probability of a corresponding frequency band in the scanning probability table when the ratio is greater than a first preset value, decrease the scanning probability of the corresponding frequency band in the scanning probability table when the ratio is smaller than a second preset value, mark a frequency band in the scanning probability table whose scanning probability is smaller than a third preset value as a failed frequency band, and ignore the failed frequency band in a next scanning process; and the value of N is more than 1.
In a preferred embodiment, the scanning apparatus further includes an activation module 400 and a preferred module 500, where the activation module 400 is specifically configured to record a failure time of each failure frequency band, and calculate a failure duration corresponding to each failure frequency band, when the failure duration reaches a fifth preset value, add the failure frequency band as a to-be-activated frequency band to the scanning probability table, and determine whether the to-be-activated frequency band is valid in a next scanning process, if so, set the scanning probability of the to-be-activated frequency band to the third preset value, and if not, delete the to-be-activated frequency band in the scanning probability table, and update the deletion time to a new failure time. The optimizing module 500 is configured to use a frequency band in the scan probability table, where the scan probability is greater than a fourth preset value, as the optimized frequency band.
In a preferred embodiment, the updating module 300 includes a calculating unit 301, where the calculating unit 301 is configured to detect each frequency band in the scan probability table, determine whether the frequency band is an idle frequency band, if so, calculate a packet error rate of receiving preset data through the idle frequency band, and determine that the corresponding frequency band is an effective frequency band when the packet error rate is smaller than a sixth preset value.
In another preferred embodiment, the initialization module 200 is specifically configured to reinitialize the scanning probability of each frequency band in the scanning probability table if no valid frequency band with a ratio greater than the first preset value is detected for a predetermined number of consecutive times.
The embodiment of the invention also provides a terminal for scanning the white spectrum frequency band in the cognitive radio, which comprises the computer readable storage medium and a processor, wherein the processor realizes the steps of the method for scanning the white spectrum frequency band in the cognitive radio when executing the computer program on the computer readable storage medium. Fig. 3 is a schematic structural diagram of a terminal for scanning a white spectrum band in cognitive radio according to embodiment 3 of the present invention, and as shown in fig. 3, a terminal 8 for scanning a white spectrum band in cognitive radio according to this embodiment includes: a processor 80, a readable storage medium 81 and a computer program 82 stored in said readable storage medium 81 and executable on said processor 80. The processor 80, when executing the computer program 82, implements the steps in the various method embodiments described above, such as steps 1 through 3 shown in fig. 1. Alternatively, the processor 80, when executing the computer program 82, implements the functions of the modules in the above-described device embodiments, such as the functions of the modules 100 to 300 shown in fig. 2.
Illustratively, the computer program 82 may be partitioned into one or more modules that are stored in the readable storage medium 81 and executed by the processor 80 to implement the present invention. The one or more modules may be a series of computer program instruction segments capable of performing specific functions, which are used to describe the execution process of the computer program 82 in the terminal 8 for scanning white spectrum frequency bands in the cognitive radio.
The terminal 8 for scanning white spectrum bands in the cognitive radio may include, but is not limited to, a processor 80 and a readable storage medium 81. Those skilled in the art will understand that fig. 3 is only an example of the scanning terminal 8 for the white spectrum band in the cognitive radio, and does not constitute a limitation to the scanning terminal 8 for the white spectrum band in the cognitive radio, and may include more or less components than those shown in the drawings, or combine some components, or different components, for example, the scanning terminal for the white spectrum band in the cognitive radio may further include a power management module, an arithmetic processing module, an input/output device, a network access device, a bus, and the like.
The Processor 80 may be a Central Processing Unit (CPU), other general purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field-Programmable Gate Array (FPGA) or other Programmable logic device, discrete Gate or transistor logic device, discrete hardware component, or the like. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
The readable storage medium 81 may be an internal storage unit of the terminal 8 for scanning the white spectrum band in the cognitive radio, for example, a hard disk or a memory of the terminal 8 for scanning the white spectrum band in the cognitive radio. The readable storage medium 81 may also be an external storage device of the scanning terminal 8 for the white spectrum band in the cognitive radio, for example, a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash memory Card (Flash Card), or the like, which is equipped on the scanning terminal 8 for the white spectrum band in the cognitive radio. Further, the readable storage medium 81 may include both an internal storage unit and an external storage device of the terminal 8 for scanning white spectrum bands in the cognitive radio. The readable storage medium 81 is used for storing the computer program and other programs and data required for the terminal to scan white spectrum bands in the cognitive radio. The readable storage medium 81 may also be used to temporarily store data that has been output or is to be output.
It will be apparent to those skilled in the art that, for convenience and brevity of description, only the above-mentioned division of the functional units and modules is illustrated, and in practical applications, the above-mentioned function distribution may be performed by different functional units and modules according to needs, that is, the internal structure of the apparatus is divided into different functional units or modules to perform all or part of the above-mentioned functions. Each functional unit and module in the embodiments may be integrated in one processing unit, or each unit may exist alone physically, or two or more units are integrated in one unit, and the integrated unit may be implemented in a form of hardware, or in a form of software functional unit. In addition, specific names of the functional units and modules are only for convenience of distinguishing from each other, and are not used for limiting the protection scope of the present application. The specific working processes of the units and modules in the system may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In the above embodiments, the descriptions of the respective embodiments have respective emphasis, and reference may be made to the related descriptions of other embodiments for parts that are not described or illustrated in a certain embodiment.
Those of ordinary skill in the art will appreciate that the various illustrative elements and method steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
In the embodiments provided in the present invention, it should be understood that the disclosed apparatus/terminal device and method may be implemented in other ways. For example, the above-described embodiments of the apparatus/terminal device are merely illustrative, and for example, the division of the modules or units is only one logical division, and there may be other divisions when actually implemented, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The invention is not limited solely to that described in the specification and embodiments, and additional advantages and modifications will readily occur to those skilled in the art, so that the invention is not limited to the specific details, representative apparatus, and illustrative examples shown and described herein, without departing from the spirit and scope of the general concept as defined by the appended claims and their equivalents.
Claims (10)
1. A method for scanning white spectrum frequency band in cognitive radio is characterized by comprising the following steps:
step 1, acquiring a white spectrum of a target time and a target place by adopting a preset spectrum sensing method, and establishing a scanning probability table, wherein the scanning probability table comprises all frequency bands of the white spectrum;
step 2, initializing the scanning probability of each frequency band in the scanning probability table;
step 3, performing continuous N-time detection on each frequency band in the scanning probability table, calculating the proportion of each frequency band which is an effective frequency band in the continuous N-time detection, increasing the scanning probability of the corresponding frequency band in the scanning probability table when the proportion is larger than a first preset value, reducing the scanning probability of the corresponding frequency band in the scanning probability table when the proportion is smaller than a second preset value, marking the frequency band of which the scanning probability is smaller than a third preset value in the scanning probability table as a failure frequency band and neglecting the failure frequency band in the next scanning process; and the value of N is more than 1.
2. The method for scanning the white spectrum frequency band in the cognitive radio according to claim 1, further comprising a step 4, wherein the step 4 specifically comprises: and taking the frequency band with the scanning probability larger than a fourth preset value in the scanning probability table as a preferred frequency band.
3. The method for scanning the white spectrum frequency band in the cognitive radio according to claim 1, further comprising a step 5, wherein the step 5 specifically comprises: recording the failure time of each failure frequency band, calculating the failure time corresponding to each failure frequency band, adding the failure frequency band serving as a frequency band to be activated into the scanning probability table when the failure time reaches a fifth preset value, judging whether the frequency band to be activated is effective in the next scanning process, if so, setting the scanning probability of the frequency band to be activated as the third preset value, and if not, deleting the frequency band to be activated in the scanning probability table, and updating the deleting time as the new failure time.
4. The method for scanning the white spectrum frequency band in the cognitive radio according to any one of claims 1 to 3, wherein the determining that the frequency band is the effective frequency band specifically comprises: and detecting each frequency band in the scanning probability table, judging whether the frequency band is an idle frequency band, if so, calculating the packet error rate of receiving preset data through the idle frequency band, and when the packet error rate is less than a sixth preset value, judging that the corresponding frequency band is an effective frequency band.
5. The method as claimed in claim 4, wherein if no valid band with a ratio greater than the first predetermined value is detected for a predetermined number of consecutive times, the scanning probability of each band in the scanning probability table is reinitialized, and the process proceeds to step 3.
6. The method for scanning the white spectrum frequency band in the cognitive radio as claimed in claim 5, wherein the preset spectrum sensing method for obtaining the white spectrum of the target time and the target location is any one or more of an energy detection method, a matched filter detection method, a cyclostationary feature detection method, a local oscillator leakage power detection method and an interference temperature-based detection method.
7. A computer-readable storage medium, storing a computer program, wherein the computer program, when executed by a processor, implements the method for scanning white spectrum bands in a cognitive radio according to any one of claims 1 to 6.
8. A terminal for scanning white spectrum bands in cognitive radio, comprising the computer-readable storage medium of claim 7 and a processor, wherein the processor, when executing the computer program on the computer-readable storage medium, implements the steps of the method for scanning white spectrum bands in cognitive radio according to any one of claims 1 to 6.
9. A scanning device of white spectrum frequency band in cognitive radio is characterized by comprising an establishing module, an initializing module and an updating module,
the establishing module is used for acquiring a white spectrum of a target time and a target place by adopting a preset spectrum sensing method and establishing a scanning probability table, wherein the scanning probability table comprises all frequency bands of the white spectrum;
the initialization module is used for initializing the scanning probability of each frequency band in the scanning probability table;
the updating module is used for carrying out continuous N-time detection on each frequency band in the scanning probability table, calculating the proportion of each frequency band which is an effective frequency band in the continuous N-time detection, increasing the scanning probability of the corresponding frequency band in the scanning probability table when the proportion is larger than a first preset value, reducing the scanning probability of the corresponding frequency band in the scanning probability table when the proportion is smaller than a second preset value, marking the frequency band of which the scanning probability is smaller than a third preset value in the scanning probability table as a failure frequency band and neglecting the failure frequency band in the next scanning process; and the value of N is more than 1.
10. The device for scanning the white spectrum frequency band in the cognitive radio according to claim 9, further comprising an activation module, wherein the activation module is specifically configured to record a failure time of each failure frequency band, calculate a failure duration corresponding to each failure frequency band, add the failure frequency band as the frequency band to be activated to the scan probability table when the failure duration reaches a fifth preset value, and determine whether the frequency band to be activated is valid in a next scanning process, if yes, set the scan probability of the frequency band to be activated to the third preset value, otherwise, delete the frequency band to be activated in the scan probability table, and update the deletion time to a new failure time.
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| CN112147704A (en) * | 2020-09-27 | 2020-12-29 | 上海特金无线技术有限公司 | Method, device and equipment for detecting unmanned aerial vehicle and storage medium |
| CN117479267A (en) * | 2023-12-28 | 2024-01-30 | 荣耀终端有限公司 | Equipment scanning method, device and storage medium based on wireless communication |
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