CN116321467B - Frequency assignment method based on matching degree of frequency requirements - Google Patents
Frequency assignment method based on matching degree of frequency requirements Download PDFInfo
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- CN116321467B CN116321467B CN202310281272.2A CN202310281272A CN116321467B CN 116321467 B CN116321467 B CN 116321467B CN 202310281272 A CN202310281272 A CN 202310281272A CN 116321467 B CN116321467 B CN 116321467B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/04—Wireless resource allocation
- H04W72/044—Wireless resource allocation based on the type of the allocated resource
- H04W72/0453—Resources in frequency domain, e.g. a carrier in FDMA
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W24/00—Supervisory, monitoring or testing arrangements
- H04W24/06—Testing, supervising or monitoring using simulated traffic
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/50—Allocation or scheduling criteria for wireless resources
- H04W72/535—Allocation or scheduling criteria for wireless resources based on resource usage policies
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Abstract
The invention relates to a frequency assignment method based on a frequency demand matching degree, and belongs to the technical field of electromagnetic spectrum management. The invention obtains the distribution result of the frequency distribution stage, namely, confirms the frequency demand; acquiring available frequency resources, analyzing forbidden frequency, guard frequency, occupied frequency and bandwidth thereof, removing the unassigned frequency bands from the existing frequency resources, and obtaining the remaining idle frequency bands as the available frequency resources; frequency band selection is carried out, the equipment frequency priority is considered, certain randomness is introduced to improve the assignment flexibility and reduce the frequency regularity; and determining a specific frequency point in the selected frequency band, and completing frequency assignment. The invention realizes intensive use of resources by improving the matching degree of frequency resources and the bandwidth required by the frequency consumption, and simultaneously introduces frequency interval factors to avoid the identification and utilization of the frequency consumption regularity by adversaries, thereby improving the flexibility and randomness of the frequency consumption.
Description
Technical Field
The invention belongs to the technical field of electromagnetic spectrum management, and particularly relates to a frequency assignment method based on a frequency demand matching degree.
Background
With the increasing of equipment types and numbers, the problem of scarce frequency spectrum resources is increasingly serious, the working frequency bands of various types of equipment are mutually overlapped, the problem of reduced frequency utilization efficiency caused by mutual interference among the equipment is prominent, and the countermeasure efficiency is seriously influenced. In order to ensure the frequency compatibility of equipment and fully exert the countermeasure effect, scientific and reasonable frequency assignment is required to be carried out on the frequency equipment.
The frequency assignment method mainly comprises theoretical models such as game theory, graph theory and auction, and the corresponding frequency assignment model is established according to the system network structure and cooperation mode of typical application scenes in current research, so that the goals of minimum interference, optimal cost-effectiveness ratio, maximum capacity, minimum energy consumption/time delay under resource limitation and the like are realized. The existing researches have realized flexible application of frequency assignment strategies, targets and technologies, but most of the problems of frequency assignment are studied from the technical point of view, the problems of less combination of use scenes and use of frequency planning backgrounds are solved, factors such as frequency requirements, equipment priorities and the like are not fully integrated, the whole support of the use of frequency planning is insufficient, and the method is difficult to be directly applied to the use of frequency planning scenes.
Disclosure of Invention
First, the technical problem to be solved
The invention aims to provide a frequency assignment method based on the matching degree of frequency requirements, so as to solve the problems that the prior research has realized flexible application of frequency assignment strategies, targets and technologies, but the frequency assignment problem is mostly researched from the technical angle, the use of scenes and the background of frequency planning are less combined, the factors of frequency requirements, equipment priorities and the like are not fully integrated, the whole support of frequency planning is insufficient, and the frequency assignment method is difficult to be directly applied to the scene of frequency planning.
(II) technical scheme
In order to solve the technical problems, the invention provides a frequency assignment method based on the matching degree of frequency requirements, which comprises the following steps:
s1, establishing a frequency demand model, and acquiring an allocation result in a frequency allocation stage, namely confirming the frequency demand;
s2, acquiring available frequency resources, analyzing forbidden frequency, guard frequency, occupied frequency and bandwidth thereof, removing the unassigned frequency bands from the existing frequency resources, and obtaining the available frequency resources as the rest idle frequency bands;
s3, frequency band matching and frequency point determination: selecting a frequency band according to the matching degree between the idle frequency band and the signal bandwidth of equipment, and simultaneously giving consideration to the equipment frequency priority, introducing certain randomness to improve the assignment flexibility and reduce the frequency regularity; and determining a specific frequency point in the selected frequency band, and completing frequency assignment.
(III) beneficial effects
Compared with the prior art, the frequency assignment method based on the matching degree of the frequency requirements comprehensively considers the use background and the requirements, combines the input and output product requirements of the frequency assignment, takes the improvement of the satisfaction degree of the frequency requirements as a guide, realizes the optimized matching of the equipment signal bandwidth and the available frequency resources by introducing the matching degree of the frequency requirements, and can effectively improve the utilization rate of the frequency resources; meanwhile, by introducing frequency interval factors, the frequency utilization regularity is prevented from being utilized by adversaries, the randomness and the anti-interference capability of the equipment frequency are improved, and the efficient and flexible frequency assignment is realized.
Drawings
FIG. 1 is a graph of the demand bandwidth satisfaction of 3 algorithms;
FIG. 2 is a graph of high priority bandwidth demand satisfaction versus;
fig. 3 is a diagram of frequency assignment;
FIG. 4 is a frequency spacing diagram;
fig. 5 is a diagram of a frequency assignment process;
fig. 6 is a schematic diagram of a process for matching frequency bands and determining frequency points.
Detailed Description
To make the objects, contents and advantages of the present invention more apparent, the following detailed description of the present invention will be given with reference to the accompanying drawings and examples.
The invention aims to provide a frequency assignment method which can fully utilize frequency resources and improve the flexibility of frequency utilization. The resource intensive use is realized by improving the matching degree of the frequency resource and the bandwidth required by the frequency use, and meanwhile, in order to avoid the frequency use regularity being identified and utilized by enemy, a frequency interval factor is introduced, so that the frequency use flexibility and randomness are improved.
The method comprises the steps of firstly establishing a frequency demand model, and assuming that N frequency equipment exists in a given area, wherein the frequency demand of each equipment is represented by four elements of frequency point number, signal bandwidth, working frequency band and frequency priority: { H, S, W, C }. Wherein the number of frequency points required by each device is { H ] 1 ,H 2 ,...,H N Total frequency point numberThe bandwidth of each equipment signal is { S } 1 ,S 2 ,...,S N The working frequency band is { W } 1 ,W 2 ,...,W N Frequency priority of { C }, use 1 ,C 2 ,...,C N }。
Fig. 3 is a diagram of frequency assignment. As shown in fig. 3, the frequency assignment process is a process of assigning device frequency based on idle frequency resources, the number of idle frequency bands is changed with the process, and when the number of idle frequency bands is M, each idle frequency band can be expressed as { B } 1 ,B 2 ,...,B M }。
Fig. 5 is a schematic diagram of a frequency assignment method based on matching degree of frequency requirements according to the present invention. As shown in fig. 5, the method comprises the steps of:
s1, establishing a frequency demand model, and acquiring an allocation result in a frequency allocation stage, namely confirming the frequency demand;
s2, acquiring available frequency resources, analyzing forbidden frequency, guard frequency, occupied frequency and bandwidth thereof, removing the unassigned frequency bands from the existing frequency resources, and obtaining the available frequency resources as the rest idle frequency bands;
s3, frequency band matching and frequency point determination: selecting a frequency band according to the matching degree between the idle frequency band and the signal bandwidth of equipment, and simultaneously giving consideration to the equipment frequency priority, introducing certain randomness to improve the assignment flexibility and reduce the frequency regularity; and determining a specific frequency point in the selected frequency band, and completing frequency assignment.
Fig. 6 is a schematic diagram of a step S3 frequency band matching and frequency point determining process. As shown in fig. 6, the frequency band matching and frequency point determining process provided by the present invention includes the following steps:
s31, calculating the matching degree between the idle frequency band and the signal bandwidth of the equipment. And establishing a frequency demand matching degree matrix K. Wherein K is an N×M matrix, K n,m To equip the matching degree of n to the frequency band m, K n,m The definition is as follows:
let K be the case if the equipment n can use the frequency band m n,m ＝S n /B m ；
If equipment n cannot use band m (e.g. band m is in equipment n operating band W n In addition to or S n ＞B m ) Let K n,m ＝0；
Wherein B is m For the bandwidth corresponding to the idle frequency band m, S n To equip the signal bandwidth of n.
S32, calculating frequency band separation probability p change =rand (0, 1), and compare p change And the magnitude of the frequency spacing factor p. p is the probability value of frequency separation, p E [0,1]]The role of p is: the frequency points of the equipment are dispersed into a wider frequency band with a certain probability. If p change If p is less than or equal to p, executing step S33, if p change P, step S34 is performed;
s33, performing frequency band separation;
s331, firstly, calculating the upper and lower limits of the frequency range constrained by the interval: in the frequency assignment process of a certain equipment, the 2 nd frequency point f n,2 The probability p and the 1 st frequency point f should be used n,1 Maintaining a certain frequency interval, and so on, setting the frequency point determined by the q-th frequency assignment to be f n,q In the q+1st frequency assignment, the upper and lower limits of the frequency range constrained by the interval are:
f n,q+1,TH,min ＝f n,q -TH
f n,q+1,TH,max ＝f n,q +TH
where TH is the frequency spacing threshold. To avoid frequency binder usage, the spacing requirement is met, and the optional frequency should meet the minimum spacing requirement with the previous frequency assignment of the equipment. The frequency interval is schematically shown in fig. 4.
S332, frequency band separation is carried out. Judging whether each idle frequency band meets the frequency separation requirement of equipment, wherein the idle frequency bands are divided into the following 3 cases:
if a frequency band which completely meets the interval requirement exists:
selecting an equipment-frequency band combination with the largest matching degree from the frequency bands; step S35 is performed;
if the frequency band which completely meets the interval requirement does not exist, but part of the frequency band which meets the interval requirement exists:
selecting a frequency band with the largest matching degree from frequency bands with partial frequency points meeting interval requirements; step S35 is performed;
if no frequency points or frequency bands meeting the interval requirement exist:
then the frequency interval threshold TH is lowered, and the step S331 is returned;
s34, selecting the frequency band and equipment with the highest equipment-frequency band matching degree, namely searching maxK n,m ；
S35, if there are a plurality of K-units n,m The equipment-frequency band combination with the highest value is obtained, and the frequency band is matched for the equipment with the highest priority, namely maxC is searched n Corresponding maxK n,m ；
S36, carrying out frequency assignment according to the frequency band matching condition:
starting from the lowest frequency point in the frequency band matched by the equipment, carrying out frequency assignment, wherein the equipment to be assigned needs to carry out frequency conflict interference analysis with all equipment with assigned frequencies, if no interference exists, using the frequency point, and if interference exists, calculating the interference condition of the next frequency point of the frequency band matched by the equipment according to the sequence from low frequency to high frequency;
because the number of the equipment is large, the calculated amount is large, and in order to reduce the calculated amount and improve the conflict analysis efficiency, the conflict interference analysis range can be gradually narrowed according to the following multi-stage screening conditions:
(1) frequency time is used: if the working time of the two devices does not have the overlapping part, no conflict is generated, and the interference analysis flow is exited;
(2) equipment distance: if the distance between the two devices is larger than the screening threshold value, no conflict is generated, and the interference analysis flow is exited;
(3) judging the existence of interference from the frequency domain according to fundamental wave and harmonic frequency of a transmitter and a receiver;
(4) calculating an interference margin: according to the gain and direction of the transmitting antenna and the receiving antenna, the propagation loss and the power, the amplitude of the received signal is calculated, whether interference exists is judged, and the interference intensity is further determined. If the interference degree of the frequency is within an acceptable range, frequency assignment is carried out; otherwise, returning to step S36, calculating the interference condition of the next frequency point of the frequency band matched by the equipment according to the sequence from low frequency to high frequency;
s37, updating the number M of the available frequency bands and the bandwidth { B } 1 ,B 2 ,...,B M -a }; updating the remaining frequency demand { H } of each equipment 1 ,H 2 ,...,H N }；
S38, judging whether the frequency assignment is completed. If the frequency assignment of all the frequency demands is completed, the bandwidth occupied by each equipment is { D } 1 ,D 2 ,...,D N }, wherein D n ＝S n ·H n,satisfied ，H n,satisfied The number of requirements to be met for the equipment n; otherwise, the process returns to step S31.
To verify the algorithm performance, the frequency assignment algorithm based on the matching degree of the frequency requirement is compared and analyzed with a random assignment method and a minimum bandwidth priority assignment method. The random assignment method is to randomly assign the frequency requirement of all equipment and all available resources; the minimum bandwidth priority assignment method is to sort available resources from low to high in frequency, and assign frequencies to the frequency demands with smaller signal bandwidth preferentially. The simulation parameters are shown in table 1.
Table 1 simulation parameters
FIG. 1 shows the comparison of the required bandwidth satisfaction of 3 algorithms, defined as the satisfied required bandwidth accounting for the total required band, in the case of completely consistent frequency demand and available frequency resourcesRatio of widthWherein N is the number of equipment, S n To equip the signal bandwidth of n, D n To equip the bandwidth n is satisfied, D n ＝S n ·H n,satisfied ，H n,satisfied To equip the number of requirements n to be met, H n,initial Initial frequency demand for equipment. The upper limit of the value is the ratio of the total amount of the frequency resources to the total amount of the frequency demands. According to fig. 1, when the frequency resource is insufficient, the required bandwidth satisfaction obtained by the algorithm provided by the invention is obviously higher than that of other two algorithms, and approaches to the upper limit of the value. As the number of equipment increases, the required bandwidth satisfaction of each algorithm decreases, but the algorithm can still stably approach the upper limit. The method is characterized in that the concept of 'frequency demand matching degree' adopted by the algorithm can assign a narrow-band signal to a narrower frequency band, and enough frequency resources are reserved for a broadband signal, so that the problems of reduced frequency resource utilization rate and the like caused by unreasonable equipment assignment sequence are avoided.
When the matching degrees are equal, the algorithm preferentially assigns frequencies to the high-priority equipment. Fig. 2 shows the difference in high priority demand bandwidth satisfaction of the present algorithm with and without consideration of equipment priority. Disregarding equipment priority refers to randomly selecting equipment for frequency assignment when the degree of matching is equal. The satisfaction degree of the high-priority required bandwidth is the proportion of the occupied bandwidth of the high-priority equipment to the total required bandwidth, C n To equip n with priority, the value range is shown in Table 1, C n The equipment of=3 is defined as high priority equipment,as can be seen from fig. 2, compared with the algorithm which does not consider the equipment priority, the algorithm provided by the invention can ensure the frequency requirement of the high-priority equipment, and the algorithm is relatively stable, and the high-priority requirement meets the lower degree along with the increase of the number of the equipment.
Table 2 shows the assigned frequency dispersion degree with the frequency interval factor pIn the variation, p is the probability that a single equipment generates a gap between a certain assignment and the previous assignment. Wherein "degree of dispersion" is defined as the mean of standard deviations of assigned frequencies for each equipment:wherein σ (f n ) The smaller the standard deviation between the frequency points occupied by the equipment n, the more concentrated the frequency assignment is indicated, and the lower the dispersion degree is. As can be seen from table 2, when the number of equipments is fixed, the dispersion degree of the assigned frequencies is the lowest and the intervals between the frequency points are smaller when p=0, and at this time, if the frequency parameters of part of the equipments are detected by the enemy, the enemy can implement blocking or aiming interference by using the regularity of the frequency in the set of the equipment; when p=1, the dispersion degree of the assigned frequencies of the equipment is higher, and the intervals of the frequency points are larger, so that effective interference is not easy to be implemented by enemy.
Table 2 assigns the frequency dispersion degree to change with the frequency interval factor
The analysis result shows that the frequency interval factor p is introduced, so that the frequency bundling is avoided. The frequency dispersion assignment can improve the anti-interference capability of the equipment, reduce the influence of electronic interference and the like on the frequency efficiency of the equipment, and when a certain frequency point is interfered, the equipment can be switched to other frequency points to work, so that the situation that all frequencies/channels are unavailable is avoided.
Compared with the prior art, the method comprehensively considers the use background and the requirement, combines the input and output product requirements of frequency assignment, takes the improvement of the satisfaction degree of the frequency requirement as a guide, realizes the optimized matching of the equipment signal bandwidth and the available frequency resource by introducing the matching degree of the frequency requirement, and can effectively improve the utilization rate of the frequency resource; meanwhile, by introducing frequency interval factors, the frequency utilization regularity is prevented from being utilized by adversaries, the randomness and the anti-interference capability of the equipment frequency are improved, and the efficient and flexible frequency assignment is realized.
The foregoing is merely a preferred embodiment of the present invention, and it should be noted that modifications and variations could be made by those skilled in the art without departing from the technical principles of the present invention, and such modifications and variations should also be regarded as being within the scope of the invention.
Claims (7)
1. A frequency assignment method based on matching degree of frequency demand, which is characterized by comprising the following steps:
s1, establishing a frequency demand model, and acquiring an allocation result in a frequency allocation stage, namely confirming the frequency demand;
s2, acquiring available frequency resources, analyzing forbidden frequency, guard frequency, occupied frequency and bandwidth thereof, removing the unassigned frequency bands from the existing frequency resources, and obtaining the available frequency resources as the rest idle frequency bands;
s3, frequency band matching and frequency point determination: selecting a frequency band according to the matching degree between the idle frequency band and the signal bandwidth of equipment, and simultaneously giving consideration to the equipment frequency priority, introducing certain randomness to improve the assignment flexibility and reduce the frequency regularity; determining specific frequency points in the selected frequency band, and completing frequency assignment;
the frequency demand model in the step S1 is as follows: assuming that there are N frequency-using devices in a given area, each device's frequency-using requirement is represented by four elements of frequency point number, signal bandwidth, working frequency band, frequency-using priority: { H, S, W, C }; wherein the number of frequency points required by each device is { H ] 1 ,H 2 ,...,H N Total frequency point numberThe bandwidth of each equipment signal is { S } 1 ,S 2 ,...,S N The working frequency band is { W } 1 ,W 2 ,...,W N Frequency priority of { C }, use 1 ,C 2 ,...,C N }；
In the step S2, when the number of idle frequency segments is M, each idle frequency band bandwidth is represented as { B } 1 ,B 2 ,...,B M }；
The step S3 specifically includes the following steps:
s31, calculating the matching degree between the idle frequency band and the signal bandwidth of the equipment; establishing a frequency demand matching degree matrix K; wherein K is an N×M matrix, K n,m Matching degree of the equipment n to the frequency range m;
s32, calculating frequency band separation probability p change =rand (0, 1), and compare p change The value of the frequency interval factor p; if p change If p is less than or equal to p, executing step S33, if p change P, step S34 is performed;
s33, performing frequency band separation;
s34, selecting the frequency band and equipment with the highest equipment-frequency band matching degree, namely searching maxK n,m ；
S35, if there are a plurality of K-units n,m The equipment-frequency band combination with the highest value is obtained, and the frequency band is matched for the equipment with the highest priority, namely maxC is searched n Corresponding maxK n,m ；
S36, carrying out frequency assignment according to the frequency band matching condition;
s37, updating the number M of the available frequency bands and the bandwidth { B } 1 ,B 2 ,...,B M -a }; updating the remaining frequency demand { H } of each equipment 1 ,H 2 ,...,H N }；
S38, judging whether the frequency assignment is completed, if so, the bandwidth occupied by each equipment is { D } 1 ,D 2 ,...,D N }, wherein D n ＝S n ·H n,satisfied ，H n,satisfied The number of requirements to be met for the equipment n; otherwise, the process returns to step S31.
2. The method for assigning frequencies based on matching degree of frequency requirements as set forth in claim 1, wherein in said step S31, K is n,m The definition is as follows:
if the equipment n can use the frequency band m, let K n,m ＝S n /B m ；
If the equipment n cannot use the frequency band m, namely the frequency band m is in the operating frequency band W of the equipment n n In addition to or S n ＞B m Let K n,m ＝0；
Wherein B is m For the bandwidth corresponding to the idle frequency band m, S n To equip the signal bandwidth of n.
3. The method for assigning frequencies based on matching degree of frequency requirements as claimed in claim 1, wherein in said step S32, p is a probability value for frequency separation, p e [0,1], and p functions as: the frequency points of the equipment are dispersed into a wider frequency band with a certain probability.
4. The method for assigning frequencies based on matching degree of frequency requirement as set forth in claim 3, wherein when p=0, the assigned frequencies have lowest dispersion degree, and each frequency point has smaller interval, and if frequency parameters of part of equipment are detected by enemies, the enemies can implement blocking type or aiming type interference by utilizing regularity of frequency in the set of the equipment; when p=1, the dispersion degree of the assigned frequencies of the equipment is higher, and the intervals of the frequency points are larger, so that effective interference is not easy to be implemented by enemy.
5. The method for assigning frequencies based on matching degree of frequency requirements as set forth in claim 1, wherein said step S33 specifically includes:
s331, firstly, calculating the upper and lower limits of the frequency range constrained by the interval: in the frequency assignment process of a certain equipment, the 2 nd frequency point f n,2 The probability p and the 1 st frequency point f should be used n,1 Maintaining a certain frequency interval, and so on, setting the frequency point determined by the q-th frequency assignment to be f n,q In the q+1st frequency assignment, the upper and lower limits of the frequency range constrained by the interval are:
f n,q+1,TH,min ＝f n,q -TH
f n,q+1,TH,max ＝f n,q +TH
wherein TH is a frequency interval threshold; to avoid frequency bundling use, and to meet the spacing requirements, the selectable frequency should meet the minimum spacing requirements with the previous frequency assignment of the equipment;
s332, performing frequency band separation, and judging whether each idle frequency band meets the frequency separation requirement of equipment, wherein the frequency separation requirement is 3 cases:
if a frequency band which completely meets the interval requirement exists:
selecting an equipment-frequency band combination with the largest matching degree from the frequency bands; step S35 is performed;
if the frequency band which completely meets the interval requirement does not exist, but part of the frequency band which meets the interval requirement exists:
selecting a frequency band with the largest matching degree from frequency bands with partial frequency points meeting interval requirements; step S35 is performed;
if no frequency points or frequency bands meeting the interval requirement exist:
the frequency interval threshold TH is lowered and the process returns to step S331.
6. The method for assigning frequencies based on matching degree of frequency requirements as set forth in claim 1, wherein said step S36 specifically includes: and starting from the lowest frequency point in the frequency band matched by the equipment, carrying out frequency assignment, wherein the equipment to be assigned needs to carry out frequency conflict interference analysis with all equipment with assigned frequencies, if no interference exists, using the frequency point, and if interference exists, calculating the interference condition of the next frequency point of the frequency band matched by the equipment according to the sequence from low frequency to high frequency.
7. The method for frequency assignment based on matching of frequency requirements as recited in claim 6, wherein the collision interference analysis range is gradually narrowed according to the following multi-stage filtering condition:
(1) frequency time is used: if the working time of the two devices does not have the overlapping part, no conflict is generated, and the interference analysis flow is exited;
(2) equipment distance: if the distance between the two devices is larger than the screening threshold value, no conflict is generated, and the interference analysis flow is exited;
(3) judging the existence of interference from the frequency domain according to fundamental wave and harmonic frequency of a transmitter and a receiver;
(4) calculating an interference margin: according to the gain and direction of the transmitting antenna and the receiving antenna, the propagation loss and the power, the amplitude of a received signal is calculated, whether interference exists is judged, and the interference intensity is further determined; if the interference degree of the frequency is within an acceptable range, frequency assignment is carried out; otherwise, returning to step S36, the interference situation of the next frequency point of the "frequency band to which the equipment is matched" is calculated in the order of the frequencies from low to high.
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