CN112737632B - Self-adaptive frequency hopping frequency point replacing method and system - Google Patents

Self-adaptive frequency hopping frequency point replacing method and system Download PDF

Info

Publication number
CN112737632B
CN112737632B CN202011554568.XA CN202011554568A CN112737632B CN 112737632 B CN112737632 B CN 112737632B CN 202011554568 A CN202011554568 A CN 202011554568A CN 112737632 B CN112737632 B CN 112737632B
Authority
CN
China
Prior art keywords
frequency point
frequency
replaceable
point set
rate
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN202011554568.XA
Other languages
Chinese (zh)
Other versions
CN112737632A (en
Inventor
张琦
杨迈
李怡嫱
陶滢
张伟
陈东
刘情嫄
沈宇飞
刘晔祺
曹桂兴
李姗姗
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Beijing University of Posts and Telecommunications
China Academy of Space Technology CAST
Original Assignee
Beijing University of Posts and Telecommunications
China Academy of Space Technology CAST
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Beijing University of Posts and Telecommunications, China Academy of Space Technology CAST filed Critical Beijing University of Posts and Telecommunications
Priority to CN202011554568.XA priority Critical patent/CN112737632B/en
Publication of CN112737632A publication Critical patent/CN112737632A/en
Application granted granted Critical
Publication of CN112737632B publication Critical patent/CN112737632B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/69—Spread spectrum techniques
    • H04B1/713—Spread spectrum techniques using frequency hopping
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/69—Spread spectrum techniques
    • H04B1/713—Spread spectrum techniques using frequency hopping
    • H04B1/715—Interference-related aspects
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/69—Spread spectrum techniques
    • H04B1/713—Spread spectrum techniques using frequency hopping
    • H04B1/715—Interference-related aspects
    • H04B2001/7152—Interference-related aspects with means for suppressing interference

Abstract

The invention discloses a self-adaptive frequency hopping frequency point replacing method and a self-adaptive frequency hopping frequency point replacing system. The method comprises the following steps: dividing a frequency band into a first speed section and a second speed section according to the transmission rate of different services in the frequency band; distributing frequency points to each service in a first rate section or a second rate section according to the transmission rate to obtain a first frequency point set and a second frequency point set; dividing the total frequency point set into a high-quality frequency point set and a low-quality frequency point set according to the error rate; removing the poor frequency point set and the frequency points occupied by the service from the total frequency point set to obtain a replaceable frequency point set; alternate frequency points are determined in the set of alternate frequency points. The method and the system can reduce the influence of interference on the frequency points, reduce the discontinuity of the frequency points caused by frequency point replacement and improve the utilization rate of the frequency points.

Description

Self-adaptive frequency hopping frequency point replacing method and system
Technical Field
The invention relates to the technical field of frequency hopping frequency point replacement, in particular to a self-adaptive frequency hopping frequency point replacement method and a self-adaptive frequency hopping frequency point replacement system.
Background
The wireless communication has the characteristic of being capable of utilizing electromagnetic waves to propagate in free space, the wireless communication technology plays more and more important roles in the fields of national defense, government agencies, commerce, civil use and the like, and meanwhile, when a wireless communication signal propagates in the free space, the wireless communication signal is interfered by various factors of human and nature, so that the normal operation of the communication process is seriously influenced. The frequency hopping technology is one of effective methods for resisting interference on certain frequencies, and the frequency hopping communication has the advantages of strong anti-interference capability, low interception probability of enemies, mature technology, easiness in realizing code division multiple access and the like. With the development of frequency hopping technology, the current self-adaptive frequency hopping is more and more widely applied, and the interfered frequency points in a channel frequency set are removed through real-time channel evaluation, so that the blind hopping of the frequency hopping is avoided, and the reliability of the system is improved.
The self-adaptive frequency selection method comprises the steps of firstly sensing an external environment, and predetermining which frequency points outside are interfered; then, the interfered frequency points are converted according to a frequency conversion rule; and then when the system use frequency in a certain time slot is about to jump to the interfered frequency point, the system switches in real time and uses the converted non-interfered frequency point.
The process of frequency hopping communication is to divide into a wide band section a plurality of frequency slot interval, the frequency channel is greater than the frequency slot interval far away, consequently can be regarded as the frequency channel and be divided into a plurality of frequency point, frequency point set contains a plurality of frequency point promptly, and the business of frequency hopping communication transmission contains multiple rate, to the business of multiple rate, can produce a large amount of frequency points idle among the frequency hopping communication process, cause the discontinuity of frequency point, because frequency hopping communication is that the carrier frequency jumps through the pseudo-random number column in very wide frequency band scope, the discontinuity of frequency point can promote the frequency point unavailability in the frequency hopping pattern determination process greatly, cause the failure of frequency point replacement simultaneously easily.
Disclosure of Invention
The invention aims to provide a self-adaptive frequency hopping frequency point replacing method and a self-adaptive frequency hopping frequency point replacing system, which can reduce the influence of interference on frequency points, reduce the discontinuity degree of the frequency points caused by frequency point replacement and improve the utilization rate of the frequency points.
In order to achieve the purpose, the invention provides the following scheme:
a self-adaptive frequency hopping frequency point replacing method comprises the following steps:
dividing the frequency band into a first speed section and a second speed section according to the transmission rate of different services in the frequency band; a transmission rate of the first rate segment is less than a transmission rate of the second rate segment;
distributing frequency points to each service in the first rate section or the second rate section according to the transmission rate to obtain a first frequency point set and a second frequency point set; the first frequency point set and the second frequency point set are combined to form a total frequency point set;
dividing the total frequency point set into a high-quality frequency point set and a low-quality frequency point set according to the error rate; the error rate of the service received by any frequency point in the high-quality frequency point set is less than that of the service received by any frequency point in the poor-quality frequency point set;
removing the inferior frequency point set and the frequency points occupied by the service in the total frequency point set to obtain a replaceable frequency point set; the poor-quality frequency point set comprises interfered frequency points;
and determining the alternative frequency points in the alternative frequency point set.
Optionally, after the dividing the frequency band into a first rate band and a second rate band according to the transmission rates of different services in the frequency band, the method further includes:
determining the size of the frequency point segment corresponding to each service according to the total number of the frequency points on the frequency band and the transmission rate of different services in the frequency band;
summing the sizes of the frequency point segments corresponding to the first speed segment to obtain the speed of the first speed segment;
summing the sizes of the frequency point segments corresponding to the second rate segment to obtain the rate of the second rate segment;
wherein the content of the first and second substances,
determining the size of the frequency point segment corresponding to each service according to the following formula:
Figure BDA0002857943510000021
in the formula, knThe size of the frequency point segment corresponding to the nth service, M is the total number of the frequency points, ajFor the transmission rate of the jth service in the frequency band, anAnd the transmission rate of the nth service in the frequency band.
Optionally, the determining the alternative frequency points in the alternative frequency point set specifically includes:
calculating the frequency spectrum discontinuity degree of each replaceable frequency point in the replaceable frequency point set after being replaced;
determining the number of interval frequency points of each replaceable frequency point from the frequency point to be replaced, and normalizing the number of interval frequency points to obtain the normalized number of interval frequency points;
taking the product of the frequency spectrum discontinuity degree and the normalized interval frequency point number as a replacement weight of a replaceable frequency point;
comparing the replacement weight values of all the replaceable frequency points, and determining the replaceable frequency point corresponding to the minimum replacement weight value as a replacement frequency point;
wherein the content of the first and second substances,
calculating the frequency spectrum discontinuity degree after each replaceable frequency point in the replaceable frequency point set is replaced according to the following formula:
Figure BDA0002857943510000031
in the formula, K is the frequency spectrum discontinuity degree, F is the number of frequency points in the total frequency point set F, uiIs the availability of the ith frequency point, ui+1Is the availability of the (i + 1) th frequency point, ui0 means that the ith frequency point is available, ui1 means that the ith frequency bin is not available.
Optionally, the comparing the replacement weights of all the replaceable frequency points, and determining the replaceable frequency point corresponding to the minimum replacement weight as the replaceable frequency point specifically includes:
comparing the replacement weight values of all the replaceable frequency points, and determining the number of the replaceable frequency points corresponding to the minimum replacement weight value;
when the number is 1, determining the replaceable frequency point corresponding to the minimum replacement weight as a replacement frequency point;
and when the number is two or more, determining that the replaceable frequency point corresponding to the minimum normalized interval frequency point number is the replaceable frequency point in the replaceable frequency points corresponding to the minimum replacement weight.
The invention also provides a self-adaptive frequency hopping frequency point replacing system, which comprises:
the frequency band dividing module is used for dividing the frequency band into a first speed band and a second speed band according to the transmission rate of different services in the frequency band; a transmission rate of the first rate segment is less than a transmission rate of the second rate segment;
the frequency point allocation module is used for allocating frequency points to each service in the first rate section or the second rate section according to the transmission rate to obtain a first frequency point set and a second frequency point set; the first frequency point set and the second frequency point set are combined to form a total frequency point set;
the frequency point set dividing module is used for dividing the total frequency point set into a high-quality frequency point set and a low-quality frequency point set according to the error rate; the error rate of the service received by any frequency point in the high-quality frequency point set is less than that of the service received by any frequency point in the poor-quality frequency point set;
a replaceable frequency point set generating module, configured to remove the poor frequency point set and the frequency points occupied by the service from the total frequency point set to obtain a replaceable frequency point set; the poor-quality frequency point set comprises interfered frequency points;
and the alternative frequency point determining module is used for determining alternative frequency points in the alternative frequency point set.
Optionally, the method further includes:
the frequency point segment size determining module is used for determining the frequency point segment size corresponding to each service according to the total number of the frequency points on the frequency band and the transmission rate of different services in the frequency band;
the speed determining module of the first speed section is used for summing the frequency point segmentation sizes corresponding to the first speed section to obtain the speed of the first speed section;
the rate determining module of the second rate section is used for summing the sizes of the frequency point sections corresponding to the second rate section to obtain the rate of the second rate section;
wherein the content of the first and second substances,
determining the size of the frequency point segment corresponding to each service according to the following formula:
Figure BDA0002857943510000041
in the formula, knThe size of the frequency point segment corresponding to the nth service, M is the total number of the frequency points, ajFor the transmission rate of the jth service in the frequency band, anAnd the transmission rate of the nth service in the frequency band.
Optionally, the replacement frequency point determining module specifically includes:
the frequency spectrum discontinuity degree calculating unit is used for calculating the frequency spectrum discontinuity degree after each replaceable frequency point in the replaceable frequency point set is replaced;
the interval frequency point number determining unit is used for determining the interval frequency point number of each replaceable frequency point from the frequency point to be replaced and carrying out normalization processing on the interval frequency point number to obtain a normalized interval frequency point number;
a substitution weight calculation unit, configured to use the product of the spectrum discontinuity degree and the normalized interval frequency point number as a substitution weight of a replaceable frequency point;
the replacing frequency point determining unit is used for comparing the replacing weight values of all the replaceable frequency points and determining the replaceable frequency point corresponding to the minimum replacing weight value as the replacing frequency point;
wherein the content of the first and second substances,
calculating the frequency spectrum discontinuity degree after each replaceable frequency point in the replaceable frequency point set is replaced according to the following formula:
Figure BDA0002857943510000051
in the formula, K isFrequency spectrum discontinuity degree, F is the number of frequency points in the total frequency point set F, uiIs the availability of the ith frequency point, ui+1Is the availability of the (i + 1) th frequency point, ui0 means that the ith frequency point is available, ui1 means that the ith frequency bin is not available.
Optionally, the replacement frequency point determining unit specifically includes:
the alternative frequency point determining subunit is used for comparing the alternative weights of all the alternative frequency points and determining the number of the alternative frequency points corresponding to the minimum alternative weight;
when the number is 1, determining the replaceable frequency point corresponding to the minimum replacement weight as a replacement frequency point;
and when the number is two or more, determining that the replaceable frequency point corresponding to the minimum normalized interval frequency point number is the replaceable frequency point in the replaceable frequency points corresponding to the minimum replacement weight.
Compared with the prior art, the invention has the beneficial effects that:
the invention provides a self-adaptive frequency hopping frequency point replacing method and a self-adaptive frequency hopping frequency point replacing system, firstly, services with different rates are transmitted in a partition mode, so that the services with different rates are hopped in different areas according to pseudo random number sequences, and the influence of interference on frequency points can be reduced to a certain extent; secondly, the concept of frequency point discontinuity is introduced, a proper replacement frequency point is selected through the measurement of the frequency point discontinuity, the discontinuity of the frequency point caused by frequency point replacement is reduced as much as possible, and meanwhile, the change of a frequency hopping pattern is ensured to be minimum, so that the utilization rate of the frequency point is improved, other services can conveniently carry out frequency hopping transmission, and meanwhile, the time transition period of the frequency hopping transmission is reduced.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.
FIG. 1 is a flowchart of a method for replacing adaptive frequency hopping frequency points according to an embodiment of the present invention;
fig. 2 is a flowchart of a self-adaptive frequency hopping frequency point replacement method based on service partitions and replacement weights in an embodiment of the present invention;
FIG. 3 is a schematic diagram of a discontinuous tap model according to an embodiment of the present invention;
FIG. 4 is a diagram illustrating a frequency hopping pattern according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention aims to provide a self-adaptive frequency hopping frequency point replacing method and a self-adaptive frequency hopping frequency point replacing system, which can reduce the influence of interference on frequency points, reduce the discontinuity degree of the frequency points caused by frequency point replacement and improve the utilization rate of the frequency points.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
Examples
Fig. 1 is a flowchart of a method for replacing a self-adaptive frequency hopping frequency point in an embodiment of the present invention, and as shown in fig. 1, the method for replacing the self-adaptive frequency hopping frequency point includes:
step 101: dividing a frequency band into a first speed section and a second speed section according to the transmission rate of different services in the frequency band; the transmission rate of the first rate segment is less than the transmission rate of the second rate segment.
After step 101, the method further comprises:
determining the size of the frequency point segment corresponding to each service according to the total number of the frequency points on the frequency band and the transmission rate of different services in the frequency band;
summing the sizes of the frequency point segments corresponding to the first speed segment to obtain the speed of the first speed segment;
and summing the sizes of the frequency point segments corresponding to the second speed segment to obtain the speed of the second speed segment.
Wherein the content of the first and second substances,
determining the size of the frequency point segment corresponding to each service according to the following formula:
Figure BDA0002857943510000061
in the formula, knThe size of the frequency point segment corresponding to the nth service, M is the total number of the frequency points, ajFor the transmission rate of the jth service in the frequency band, anAnd the transmission rate of the nth service in the frequency band.
Step 102: distributing frequency points to each service in a first rate section or a second rate section according to the transmission rate to obtain a first frequency point set and a second frequency point set; the first frequency point set and the second frequency point set are combined to form a total frequency point set.
Step 103: dividing the total frequency point set into a high-quality frequency point set and a low-quality frequency point set according to the error rate; the error rate of the service received by any frequency point in the high-quality frequency point set is less than that of the service received by any frequency point in the poor-quality frequency point set.
Step 104: removing the poor frequency point set and the frequency points occupied by the service from the total frequency point set to obtain a replaceable frequency point set; the poor quality frequency point set includes the interfered frequency points.
Step 105: alternate frequency points are determined in the set of alternate frequency points.
Step 105, specifically comprising:
calculating the frequency spectrum discontinuity degree of each replaceable frequency point in the replaceable frequency point set after being replaced;
determining the number of interval frequency points of each replaceable frequency point from the frequency point to be replaced, and normalizing the number of the interval frequency points to obtain the normalized interval frequency points;
taking the product of the frequency spectrum discontinuity degree and the normalized interval frequency point number as a replacement weight of the replaceable frequency point;
and comparing the replacement weight values of all the replaceable frequency points, and determining the replaceable frequency point corresponding to the minimum replacement weight value as the replacement frequency point. (i.e. comparing the replacement weight values of all the replaceable frequency points, determining the number of the replaceable frequency points corresponding to the minimum replacement weight value, determining the replaceable frequency point corresponding to the minimum replacement weight value as the replacement frequency point when the number is 1, and determining the replaceable frequency point corresponding to the minimum normalized interval frequency point as the replacement frequency point in the replaceable frequency points corresponding to the minimum replacement weight value when the number is two or more).
Wherein the content of the first and second substances,
calculating the frequency spectrum discontinuity degree after each replaceable frequency point in the replaceable frequency point set is replaced according to the following formula:
Figure BDA0002857943510000071
in the formula, K is the frequency spectrum discontinuity degree, F is the number of frequency points in the total frequency point set F, uiIs the availability of the ith frequency point, ui+1Is the availability of the (i + 1) th frequency point, ui0 means that the ith frequency point is available, u i1 means that the ith frequency bin is not available.
The invention also provides a self-adaptive frequency hopping frequency point replacing system, which comprises:
the frequency band dividing module is used for dividing the frequency band into a first speed band and a second speed band according to the transmission rate of different services in the frequency band; the transmission rate of the first rate segment is less than the transmission rate of the second rate segment.
The frequency point distribution module is used for distributing frequency points to each service in a first rate section or a second rate section according to the transmission rate to obtain a first frequency point set and a second frequency point set; the first frequency point set and the second frequency point set are combined to form a total frequency point set.
The frequency point set dividing module is used for dividing the total frequency point set into a high-quality frequency point set and a low-quality frequency point set according to the error rate; the error rate of the service received by any frequency point in the high-quality frequency point set is less than that of the service received by any frequency point in the poor-quality frequency point set.
The replaceable frequency point set generating module is used for removing the inferior frequency point set and the frequency points occupied by the service from the total frequency point set to obtain a replaceable frequency point set; the poor quality frequency point set includes the interfered frequency points.
And the alternative frequency point determining module is used for determining the alternative frequency points in the alternative frequency point set.
The adaptive frequency hopping frequency point replacing system provided by the invention also comprises:
and the frequency point segment size determining module is used for determining the frequency point segment size corresponding to each service according to the total number of the frequency points on the frequency band and the transmission rate of different services in the frequency band.
And the rate determining module of the first rate section is used for summing the frequency point segmentation sizes corresponding to the first rate section to obtain the rate of the first rate section.
And the rate determining module of the second rate section is used for summing the sizes of the frequency point sections corresponding to the second rate section to obtain the rate of the second rate section.
Wherein the content of the first and second substances,
determining the size of the frequency point segment corresponding to each service according to the following formula:
Figure BDA0002857943510000081
in the formula, knThe size of the frequency point segment corresponding to the nth service, M is the total number of the frequency points, ajFor the transmission rate of the jth service in the frequency band, anAnd the transmission rate of the nth service in the frequency band.
Wherein the content of the first and second substances,
the replacement frequency point determining module specifically comprises:
the frequency spectrum discontinuity degree calculating unit is used for calculating the frequency spectrum discontinuity degree after each replaceable frequency point in the replaceable frequency point set is replaced;
the interval frequency point number determining unit is used for determining the interval frequency point number of each replaceable frequency point from the frequency point to be replaced and carrying out normalization processing on the interval frequency point number to obtain a normalized interval frequency point number;
the replacement weight calculation unit is used for taking the product of the frequency spectrum discontinuity degree and the normalized interval frequency point number as a replacement weight of the replaceable frequency point;
the replacing frequency point determining unit is used for comparing the replacing weight values of all the replaceable frequency points and determining the replaceable frequency point corresponding to the minimum replacing weight value as the replacing frequency point;
wherein the content of the first and second substances,
calculating the frequency spectrum discontinuity degree after each replaceable frequency point in the replaceable frequency point set is replaced according to the following formula:
Figure BDA0002857943510000091
in the formula, K is the frequency spectrum discontinuity degree, F is the number of frequency points in the total frequency point set F, uiIs the availability of the ith frequency point, ui+1Is the availability of the (i + 1) th frequency point, ui0 means that the ith frequency point is available, u i1 means that the ith frequency bin is not available.
The replacement frequency point determining unit specifically comprises:
the alternative frequency point determining subunit is used for comparing the alternative weights of all the alternative frequency points and determining the number of the alternative frequency points corresponding to the minimum alternative weight;
when the number is 1, determining the replaceable frequency point corresponding to the minimum replacement weight as a replacement frequency point;
and when the number is two or more, determining that the replaceable frequency point corresponding to the minimum normalized interval frequency point number is the replaceable frequency point in the replaceable frequency points corresponding to the minimum replacement weight.
The following embodiments specifically illustrate the adaptive frequency hopping point replacement method based on service partition and replacement weight.
Fig. 2 is a flowchart of a self-adaptive frequency hopping frequency point replacement method based on service partitions and replacement weights. As shown in fig. 2, the wide frequency band is partitioned, and the frequency band is divided into two parts according to the service rate: a high-rate segment and a low-rate segment for transmitting higher-rate traffic and lower-rate traffic, respectively.
The specific partitioning method comprises the following steps:
is shared by the whole wide frequency bandM frequency points, the service rate of the transmission on the whole broadband is a1、a2…ai…anAnd it is ordered by rate size, i.e. a1<a2<…<ai<…<anIf the frequency point segment size of the nth rate service is equal to
Figure BDA0002857943510000092
Combining the n segments into two segments, the first segment rate being
Figure BDA0002857943510000093
Namely a low speed section; a second stage rate of
Figure BDA0002857943510000094
I.e. the high rate segment. After frequency band division, different speed rate service will be transmitted in different areas according to the speed, if the ith service
Figure BDA0002857943510000101
The service allocates frequency points in the low-rate segment; if it is
Figure BDA0002857943510000102
The traffic is allocated frequency points in the high rate segment.
Specific allocation rules are exemplified by:
the service transmitted in the wide frequency band has four rates a1＝4,a2＝12,a3＝16,a4If the total frequency point number M is 256, the frequency point segments respectively corresponding to the four service rates are:
Figure BDA0002857943510000103
in the same way, k can be obtained2＝48，k3＝64，k4128. Will k1、k2The two lower rates are merged into a low rate segment: the first stage rate is
Figure BDA0002857943510000104
Namely a low speed section; the second stage rate calculated by the same method isA2192, i.e. a high rate segment. Rate of a1＝4,a2When the service of 12 is transmitted in a broadband, allocating frequency points in a low-rate section; rate of a3＝16,a4When 32 services are transmitted in a wide frequency band, frequency points are allocated in a high-rate section.
And after the service transmission subarea is determined, a frequency hopping pattern determination process of frequency hopping transmission is carried out.
Firstly, frequency hopping sequences are generated, and a shift register structure for constructing the frequency hopping sequences has various modes, wherein m sequences constructed by an L-G model have the best control effect on frequency hopping points, and Hamming autocorrelation of the sequences and Hamming cross-correlation between the two sequences reach the theoretical minimum. The m-sequence shift register based on the L-G model is divided into a continuous tap model and a discontinuous tap model according to whether taps are continuous or not, the discontinuous tap model is adopted in the scheme, as shown in FIG. 3, Cn in FIG. 3 is a coefficient of a feedback shift register, and Cn belongs to (0, 1). Taking r non-adjacent stages to control frequency hopping, 2 can be generatedrA hopping sequence of frequency slots, a hopping sequence control word as shown in the following equation:
Su(j)＝2r-1[(ai+u0)mod2]+…+20[(aj+r-1+ur-1)mod2]
where r represents the number of taps, i.e. the number of members in the family of sequences is 2n；Su(j) Represents the output of the frequency synthesizer, and u is a tap coefficient value which takes the value of 0 or 1; a represents an m-sequence, and j is an m-sequence subscript; mod2 represents a modulo two operation.
Because the frequency hopping system can work in a frequency hopping mode in the whole frequency band according to the frequency hopping pattern, all used frequency points hop randomly in the frequency point set F, frequency point replacement needs to be carried out on the frequency points with interference influence, and for the frequency point replacement rule of bad frequency points, firstly, the frequency point set which is interfered and occupied by the system in a time period t needs to be determined. In the invention, the transmission frequency band is divided into high and low rates according to the service rate, so the frequency point set can be divided into FhAnd FlTwo parts. Meanwhile, the frequency point set is also divided into a good frequency point set FgAnd bad frequency point set FbTwo parts. And calculating the frequency point used by the next time slot in the current time slot. The frequency point F used by the next time slot belongs to FbIn the process, the frequency point f needs to be transformed, and the transformed frequency point is f'. The rule for handling the transformation is as follows.
1. Dividing each frequency point in the frequency point set F of the system into a good frequency point set F according to a set error rate threshold valuegAnd bad frequency point set FbAs shown in the following formula:
Fh＝Fgh∪Fbh
Fl＝Fgl∪Fbl
F＝Fh∪Fl
and the channel evaluation standard adopts the error rate for evaluation. Calculating a certain frequency point fiError rate of service received at upper layer
Figure BDA0002857943510000111
By applying a certain frequency fiError rate of service P received at upper parteAnd frequency point receiving error rate threshold value PeminMaking a comparison if PeGreater than PeminIf so, the frequency point f is considerediThe bad frequency points (inferior frequency points) belong to a bad frequency point set; if P iseIs less than or equal to PeminIf so, the frequency point f is considerediIs a good frequency point (high-quality frequency point) and belongs to a good frequency point set. The good frequency point set comprises frequency points which are not interfered and have good communication quality, and the bad frequency point set comprises frequency points which are interfered and have poor communication quality. Gradually selecting a good frequency point set F from a frequency point set F of a system according to the methodgAnd bad frequency point set Fb。
Figure BDA0002857943510000112
When the error rate of the frequency point receiving service exceeds the threshold value, defining the frequency point as a bad frequency point and storing the bad frequency point in a bad frequency point set; when the error rate of the frequency point receiving service is smaller than the threshold value, the frequency point receiving service is defined as a good frequency point and is stored in a good frequency point set.
2. DeterminingInterfered frequency point F in frequency set F in current hop time period tbAnd determining the frequency point F occupied by other services through the complete set scanninguOther frequency points are the replaceable frequency point set F meeting the requirement0。
3. Within the current hop duration time t, the frequency point F occupied by other servicesuMarked as bad frequency point Fb。
4. And determining the bad frequency point condition of the whole frequency band. u. ofiIs used for indicating whether the ith frequency point is a bad frequency point, namely whether the ith frequency point is usable, if the ith frequency point is a bad frequency point, u i1 is ═ 1; if the ith frequency point is a good frequency point, ui＝0。
5. Calculating the frequency spectrum discontinuity degree after each replaceable frequency point is replaced
Figure BDA0002857943510000121
6. Calculating the interval frequency point number M' of each replaceable frequency point distance frequency conversion point, and normalizing the interval frequency point number into
Figure BDA0002857943510000122
7. Defining the replacement weight of the replaceable frequency point: k × M0. At alternative frequency point set F0Pre-replacing each replaceable frequency point, calculating the replacement weight P of the replaceable frequency point after pre-replacement, and if the replacement weight P of the replacement is less than the stored replacement weight PtThen replace P with the new replacement weight PtAnd storing the current replacing frequency point. In so doing, traverse the entire set of alternative frequency points F0And then, storing the frequency point with the minimum P value. This frequency point is the alternative frequency point.
8. If the replaceable frequency point with the minimum P value has two or more than two, M is selected0The smallest point, where possible, ensures that the hopping pattern changes minimally.
The generation of the new hopping pattern is shown in figure 4.
The process is exemplified as follows:
the frequency band is divided into two segments of high and low rates, wherein, taking one segment as an example, a certain segment is assumedContaining 9 frequency points, i.e. F ═ F1,f2，…，f9Is determined by the bit error rate threshold value and the complete set scanning, f1For bad frequency points, i.e. f1∈Fb，f5、f7、f8、f9For frequency points occupied by other services, i.e. f5、f7、f8、f9∈FuThe other frequency points are good frequency points, i.e. f2、f3、f4、f6∈F0And belongs to replaceable frequency points. Marking the occupied frequency points as bad frequency points, wherein f1、f5、f7、f8、f9∈Fb. Four frequency points are used as alternative replaceable frequency points, and f is firstly replaced2Performing pre-substitution, calculating if f2When replacing frequency points, the replacement weight is
Figure BDA0002857943510000123
Continue to pair f3Performing pre-substitution, calculating P30.148, because P3>P2Then P is continuously saved2Replacing the weight of f, proceeding similarly4、f6The replacement weights are 0.148 and 0.123, respectively. Thus, f can be obtained2The frequency point is optimally replaced. Will f is2And setting the frequency points as replacement frequency points to generate a new frequency hopping pattern.
After the frequency hopping pattern is generated, a communication link needs to be established, synchronization is established first, and synchronization of the frequency hopping pattern is ensured on the basis of ensuring clock synchronization and frame synchronization of both communication parties. And then, in a communication maintaining stage, due to the change of channel conditions (mainly the change of relative positions of two communication parties or the change of interference), the real-time channel quality estimator uses a reliable signaling protocol to timely inform the other party through a signaling link according to the changed monitoring result, adjusts a frequency hopping frequency set at any time, replaces bad frequency points in the frequency set, and ensures the synchronization of frequency hopping patterns of the two communication parties. Meanwhile, the power of the transmitter is adjusted, and the two parties can communicate with each other at the minimum transmitting power.
The principles and embodiments of the present invention have been described herein using specific examples, which are provided only to help understand the method and the core concept of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In summary, this summary should not be construed to limit the present invention.

Claims (6)

1. A method for replacing a self-adaptive frequency hopping frequency point is characterized by comprising the following steps:
dividing the frequency band into a first speed section and a second speed section according to the transmission rate of different services in the frequency band; a transmission rate of the first rate segment is less than a transmission rate of the second rate segment;
distributing frequency points to each service in the first rate section or the second rate section according to the transmission rate to obtain a first frequency point set and a second frequency point set; the first frequency point set and the second frequency point set are combined to form a total frequency point set;
dividing the total frequency point set into a high-quality frequency point set and a low-quality frequency point set according to the error rate; the error rate of the service received by any frequency point in the high-quality frequency point set is less than that of the service received by any frequency point in the poor-quality frequency point set;
removing the inferior frequency point set and the frequency points occupied by the service in the total frequency point set to obtain a replaceable frequency point set; the poor-quality frequency point set comprises interfered frequency points;
determining alternative frequency points in the alternative frequency point set; the method specifically comprises the following steps:
calculating the frequency spectrum discontinuity degree of each replaceable frequency point in the replaceable frequency point set after being replaced;
determining the number of interval frequency points of each replaceable frequency point from the frequency point to be replaced, and normalizing the number of interval frequency points to obtain the normalized number of interval frequency points;
taking the product of the frequency spectrum discontinuity degree and the normalized interval frequency point number as a replacement weight of a replaceable frequency point;
comparing the replacement weight values of all the replaceable frequency points, and determining the replaceable frequency point corresponding to the minimum replacement weight value as a replacement frequency point;
wherein the content of the first and second substances,
calculating the frequency spectrum discontinuity degree after each replaceable frequency point in the replaceable frequency point set is replaced according to the following formula:
Figure FDA0003256606530000011
in the formula, K is the frequency spectrum discontinuity degree, F is the number of frequency points in the total frequency point set F, uiIs the availability of the ith frequency point, ui+1Is the availability of the (i + 1) th frequency point, ui0 means that the ith frequency point is available, ui1 means that the ith frequency bin is not available.
2. The method of claim 1, wherein the frequency band is divided into a first rate band and a second rate band according to the transmission rates of different services in the frequency band, and the method further comprises:
determining the size of the frequency point segment corresponding to each service according to the total number of the frequency points on the frequency band and the transmission rate of different services in the frequency band;
summing the sizes of the frequency point segments corresponding to the first speed segment to obtain the speed of the first speed segment;
summing the sizes of the frequency point segments corresponding to the second rate segment to obtain the rate of the second rate segment;
wherein the content of the first and second substances,
determining the size of the frequency point segment corresponding to each service according to the following formula:
Figure FDA0003256606530000021
in the formula, knThe size of the frequency point segment corresponding to the nth service, M is the total number of the frequency points, ajFor the transmission rate of the jth service in the frequency band, anAnd the transmission rate of the nth service in the frequency band.
3. The method according to claim 1, wherein the comparing the replacement weights of all the replaceable frequency points and determining the replaceable frequency point corresponding to the minimum replacement weight as the replacement frequency point specifically comprises:
comparing the replacement weight values of all the replaceable frequency points, and determining the number of the replaceable frequency points corresponding to the minimum replacement weight value;
when the number is 1, determining the replaceable frequency point corresponding to the minimum replacement weight as a replacement frequency point;
and when the number is two or more, determining that the replaceable frequency point corresponding to the minimum normalized interval frequency point number is the replaceable frequency point in the replaceable frequency points corresponding to the minimum replacement weight.
4. An adaptive frequency hopping frequency point replacing system, comprising:
the frequency band dividing module is used for dividing the frequency band into a first speed band and a second speed band according to the transmission rate of different services in the frequency band; a transmission rate of the first rate segment is less than a transmission rate of the second rate segment;
the frequency point allocation module is used for allocating frequency points to each service in the first rate section or the second rate section according to the transmission rate to obtain a first frequency point set and a second frequency point set; the first frequency point set and the second frequency point set are combined to form a total frequency point set;
the frequency point set dividing module is used for dividing the total frequency point set into a high-quality frequency point set and a low-quality frequency point set according to the error rate; the error rate of the service received by any frequency point in the high-quality frequency point set is less than that of the service received by any frequency point in the poor-quality frequency point set;
a replaceable frequency point set generating module, configured to remove the poor frequency point set and the frequency points occupied by the service from the total frequency point set to obtain a replaceable frequency point set; the poor-quality frequency point set comprises interfered frequency points;
a replacing frequency point determining module, configured to determine a replacing frequency point in the replaceable frequency point set; the method specifically comprises the following steps:
the frequency spectrum discontinuity degree calculating unit is used for calculating the frequency spectrum discontinuity degree after each replaceable frequency point in the replaceable frequency point set is replaced;
the interval frequency point number determining unit is used for determining the interval frequency point number of each replaceable frequency point from the frequency point to be replaced and carrying out normalization processing on the interval frequency point number to obtain a normalized interval frequency point number;
a substitution weight calculation unit, configured to use the product of the spectrum discontinuity degree and the normalized interval frequency point number as a substitution weight of a replaceable frequency point;
the replacing frequency point determining unit is used for comparing the replacing weight values of all the replaceable frequency points and determining the replaceable frequency point corresponding to the minimum replacing weight value as the replacing frequency point;
wherein the content of the first and second substances,
calculating the frequency spectrum discontinuity degree after each replaceable frequency point in the replaceable frequency point set is replaced according to the following formula:
Figure FDA0003256606530000031
in the formula, K is the frequency spectrum discontinuity degree, F is the number of frequency points in the total frequency point set F, uiIs the availability of the ith frequency point, ui+1Is the availability of the (i + 1) th frequency point, ui0 means that the ith frequency point is available, ui1 means that the ith frequency bin is not available.
5. The adaptive frequency hopping frequency point replacement system according to claim 4, further comprising:
the frequency point segment size determining module is used for determining the frequency point segment size corresponding to each service according to the total number of the frequency points on the frequency band and the transmission rate of different services in the frequency band;
the speed determining module of the first speed section is used for summing the frequency point segmentation sizes corresponding to the first speed section to obtain the speed of the first speed section;
the rate determining module of the second rate section is used for summing the sizes of the frequency point sections corresponding to the second rate section to obtain the rate of the second rate section;
wherein the content of the first and second substances,
determining the size of the frequency point segment corresponding to each service according to the following formula:
Figure FDA0003256606530000041
in the formula, knThe size of the frequency point segment corresponding to the nth service, M is the total number of the frequency points, ajFor the transmission rate of the jth service in the frequency band, anAnd the transmission rate of the nth service in the frequency band.
6. The adaptive frequency hopping frequency point replacing system according to claim 4, wherein the replacing frequency point determining unit specifically includes:
the alternative frequency point determining subunit is used for comparing the alternative weights of all the alternative frequency points and determining the number of the alternative frequency points corresponding to the minimum alternative weight;
when the number is 1, determining the replaceable frequency point corresponding to the minimum replacement weight as a replacement frequency point;
and when the number is two or more, determining that the replaceable frequency point corresponding to the minimum normalized interval frequency point number is the replaceable frequency point in the replaceable frequency points corresponding to the minimum replacement weight.
CN202011554568.XA 2020-12-24 2020-12-24 Self-adaptive frequency hopping frequency point replacing method and system Active CN112737632B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202011554568.XA CN112737632B (en) 2020-12-24 2020-12-24 Self-adaptive frequency hopping frequency point replacing method and system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202011554568.XA CN112737632B (en) 2020-12-24 2020-12-24 Self-adaptive frequency hopping frequency point replacing method and system

Publications (2)

Publication Number Publication Date
CN112737632A CN112737632A (en) 2021-04-30
CN112737632B true CN112737632B (en) 2021-12-17

Family

ID=75616109

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202011554568.XA Active CN112737632B (en) 2020-12-24 2020-12-24 Self-adaptive frequency hopping frequency point replacing method and system

Country Status (1)

Country Link
CN (1) CN112737632B (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113037327B (en) * 2021-05-19 2021-08-24 四川大学 Frequency hopping sequence set construction method based on channel quality characteristics
CN113765540B (en) * 2021-08-31 2022-09-02 北京航空航天大学 Ad hoc network communication method based on autonomous frequency hopping of unmanned aerial vehicle, unmanned aerial vehicle and medium
CN115119320B (en) * 2022-08-26 2022-12-13 广州安凯微电子股份有限公司 Channel selection method and device based on Bluetooth adaptive frequency hopping

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE69731599D1 (en) * 1996-12-10 2004-12-23 Gen Instrument Corp URL mapping for broadcast addresses on a television channel
CN103441779A (en) * 2013-09-22 2013-12-11 郭建新 Frequency hopping communication anti-interference method based on cognitive radio
CN104202066A (en) * 2014-09-10 2014-12-10 中国地质大学（武汉） Differential frequency hopping communication method and system based on cognitive radio
CN105379182A (en) * 2014-04-22 2016-03-02 华为技术有限公司 Spectrum division method and device
CN111342921A (en) * 2020-03-06 2020-06-26 西京学院 Cognitive radio-based frequency spectrum sharing method, system and application in frequency hopping communication

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2491836B (en) * 2011-06-13 2018-08-22 Huawei Tech Co Ltd Frequency planning
CN106656454B (en) * 2016-11-07 2019-09-17 中国电子科技集团公司第二十研究所 Offset estimation and compensation method based on wide interval frequency hopping system
CN107682043B (en) * 2017-10-30 2020-01-17 四川九洲电器集团有限责任公司 Method for generating frequency hopping pattern

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE69731599D1 (en) * 1996-12-10 2004-12-23 Gen Instrument Corp URL mapping for broadcast addresses on a television channel
CN103441779A (en) * 2013-09-22 2013-12-11 郭建新 Frequency hopping communication anti-interference method based on cognitive radio
CN105379182A (en) * 2014-04-22 2016-03-02 华为技术有限公司 Spectrum division method and device
CN104202066A (en) * 2014-09-10 2014-12-10 中国地质大学（武汉） Differential frequency hopping communication method and system based on cognitive radio
CN111342921A (en) * 2020-03-06 2020-06-26 西京学院 Cognitive radio-based frequency spectrum sharing method, system and application in frequency hopping communication

Also Published As

Publication number Publication date
CN112737632A (en) 2021-04-30

Similar Documents

Publication Publication Date Title
CN112737632B (en) Self-adaptive frequency hopping frequency point replacing method and system
CN110771050B (en) Specific hopping patterns for message splitting
CN102362516B (en) System and method for probability-based resource allocation in a wireless communication system
CN106100696B (en) A kind of non-linear frequency hopping pattern generation system based on TOD temporal informations
US5408496A (en) Spread-spectrum, frequency-hopping radiotelephone system
Verhulst et al. Slow frequency hopping multiple access for digital cellular radiotelephone
US20020021745A1 (en) Multi-channel-bandwidth frequency-hopping system
US5737358A (en) Multiplexed radio communication system
US20010050945A1 (en) Orthogonal frequency hopping using skip zones
CN103441779A (en) Frequency hopping communication anti-interference method based on cognitive radio
CN101047402B (en) Communication control method/system
CN107682043B (en) Method for generating frequency hopping pattern
CN107040323B (en) Multichannel power bandwidth combined distributing method in a kind of cognitive radio networks
CN104022796A (en) Method and structure for generating frequency hopping sequence based on discontinuous frequency bands
CN102299727B (en) Interlacing method used for WLAN frequency hopping system
Courjault et al. How robust is a LoRa communication against impulsive noise?
CN108347261B (en) Synchronous frequency hopping orthogonal networking method based on Beidou time service
CN115118306B (en) Power Internet of things frequency hopping sequence pattern generation method and power Internet of things equipment
CN101645725A (en) Method for constructing time-frequency hop sequences in cognitive radio TFH-CDMA system
CN106685550B (en) Completely distributed encountering method for unauthorized users in cognitive radio network
CN108366385B (en) Synchronous frequency hopping orthogonal networking method based on frequency point grouping
CN114374586B (en) Data transmission method, transmitter and receiver
CN101521925A (en) Method for lowering cognitive radio network communication interruption probability
CN102917451B (en) The method of a kind of distributing antenna system up-link power distribution and device
CN102045085A (en) Sequence frequency hopping method and device based on ARNS (Aeronautical Radio Navigation Service)

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant