CN103441779B - A kind of frequency hopping communications anti-interference method based on cognitive radio - Google Patents
A kind of frequency hopping communications anti-interference method based on cognitive radio Download PDFInfo
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Abstract
A kind of frequency hopping communications anti-interference method based on cognitive radio includes frequency hopping communications interference spectrum cognitive method, rejects the method that interference frequency point obtains spectral window, frequency hopping key shares transmission method under disturbed condition.The related thought of cognitive radio is dissolved into frequency hopping communications, by perceiving periphery electromagnetic environment, dynamic selects several interference temperatures lower " spectral window " as the transmission band of Frequency Hopping Signal, wireless frequency hopping radio set can be improved to the adaptability of electromagnetic environment, increase the utilization rate of frequency spectrum resource, disturbing between enemy's malicious interference and radio station certainly is further suppressed, and improves the network capacity of frequency hopping communications networks, reduces the bit error rate of entire frequency-hopping system.
Description
Technical field
Cognitive radio is combined field with frequency hopping communications by the present invention, and in particular to a kind of to improve frequency hopping radio set
Channel capacity under anti-random disturbances, bursty interference and mixing disturbed condition, reduces the communication bit error rates of system under interference environment
Method.
Background technique
Frequency hopping communications is concerned due to it is with good confidentiality, near far resistance and the performances such as anti-interference, extensively
Applied in modern military shortwave, ultrashort wave and data-link signal equipment.With increasingly complicated, the existing frequency hopping of electromagnetic environment
Communication system is facing more and more problem and challenge, gradually influences the performance of frequency hopping jam-resistant communication system.
Validity (bandwidth, power system capacity) and reliability (bit error rate) are the main performance index of communication system.Actually answer
It is had the following problems with the validity and reliability of frequency hopping communications when in the process, encountering interference:
In conventional frequency-hopping communication system, receiving-transmitting sides carry out frequency hopping pattern be it is pre-planned, once communication link
Establish, both sides will in communication process each of order traversal frequency hopping pattern frequency point, seldom the frequency point of frequency set is carried out
Quality analysis, our this frequency-hopping modes are referred to as " blindly jumping ".In this mode, even if certain frequency points are heavily disturbed, it is
Guarantee the synchronization of receiving-transmitting sides frequency hopping pattern, system still uses these frequency points, and the interference on these frequency points is then mainly led to
System hops gain, frequency hopping rate and channel decoding gain are crossed to inhibit.As the increasingly sophisticated and electromagnetism of electromagnetic environment is believed
Number it is increasingly intensive, more and more garbage signals and artificially will be more introduced into the frequency hopping communications frequency range of " clean " originally
Interference, the presence of these signals can destroy the communication of the frequency point on more and more original Hopping frequencies collection, cause a large amount of error codes, thus
The anti-interference ability of reduction system.Frequency hopping point " collision " probability increases, and restricts frequency hopping communications networks capacity boost.As frequency hopping is more
The extensive use of location, hopped-frequency pulses in wireless communications is netted between interior different user, with the usable frequency money between frequency range net system
Also by growing tension, the orthogonality of frequency hopping pattern collection is more difficult to be guaranteed in source, so as to cause frequency hopping point collision phenomenon increasingly
Obviously, the capacity boost of frequency hopping communications networks will directly be restricted.
The related thought of cognitive radio is dissolved among frequency hopping communications by this method, by detecting periphery electromagnetic environment
(interference, unintentionally interference, noise etc. intentionally), selects several interference temperatures lower " spectral window " dynamically as frequency hopping
The transmission band of signal, can be improved frequency hopping radio set to the adaptability of electromagnetic environment, the utilization rate that increases frequency spectrum resource, further
Inhibit the network capacity disturbed certainly, improve frequency hopping communications networks between enemy's malicious interference and radio station, reduces error rate of system.
Summary of the invention
The object of the invention is to combine the advanced features of cognitive radio thought, provide a kind of design rationally, be easy to real
Frequency hopping communications Anti-jamming that is existing, not changing existing broadcasting station structure, significantly improves the capacity of system, reduces the bit error rate.
This hair technical solution:
A kind of frequency hopping communications anti-interference method based on cognitive radio, which is characterized in that the anti-interference method includes
Three parts: the anti-interference frequency spectrum window detection method of frequency hopping communications rejects interference frequency point and obtains the method and disturbed condition of spectral window
Lower frequency hopping key shares transmission method.
The anti-interference frequency spectrum window detection method of frequency hopping communications, specifically:
A, the bandwidth of entire frequency band and each frequency point according to used in system hops, is divided into several relatively narrow sons
Frequency band；
B, using the frequency spectrum sensing method of cognitive radio energy measuring, all frequency bands supported system carry out the period
Property perception detection, obtain the energy feature of each frequency band；
C, it detects whether there is " spectral window " according to " interference temperature " situation in channel, and is provided according to corresponding criterion
The qualitative character of each " spectral window ".
The method rejected interference frequency point and obtain spectral window, specifically:
A, windowing process and FFT transform are carried out to the signal detected in the above method；
B, statistic in step A is calculated, determines and rejects thresholding；
C, algorithm is rejected using the continuous mean value of FCME(), the frequency for interfering larger unsuitable frequency hopping to use is rejected, is obtained not
" spectral window " of disturbed suitable frequency hopping communications；
D, it according to obtained spectral window and its management information, determines new usable frequency collection, generates new frequency hopping pattern.
Frequency hopping key shares transmission method under the disturbed condition, specifically:
1), newly-generated frequency hopping key information is grouped by the every jump bandwidth limitation of system；
2), by the information after grouping, in conjunction with fountain codes coding rule, formation meets debit under disturbed condition and is easy to receive simultaneously
It is not easy the disturbed information frame just intercepted and captured；
3) after, debit receives integrity key information, ACK confirmation signal is sent to originating party；
4), receiving-transmitting sides start to carry out normal frequency hopping communications according to new frequency hopping pattern.
The beneficial effects of the present invention are:
By periodic frequency spectrum detection, the feature of system electromagnetic environment related communication frequency band is obtained, rejects interference frequency point
It obtains the spectral window of suitable system frequency hopping communications and generates new frequency set, new frequency hopping key is transmitted under disturbed condition, it is real
Existing receiving-transmitting sides are shared to carry out antijam communication, and by increasing corresponding detection, computing module to radio station, it is anti-dry to improve frequency hopping radio set
Disturb communication capacity.The frequency hopping communications Anti-jamming that the present invention has rational design, is easily achieved, does not change existing broadcasting station structure,
The capacity of system can be significantly improved, the bit error rate is reduced.
Detailed description of the invention
Fig. 1 is the principle of the present invention block schematic illustration.
The frequency-hopping communication system schematic diagram that Fig. 2 is made of the method for the present invention.
Fig. 3 is present system frequency spectrum detection and the schematic diagram that spectral window utilizes.
Fig. 4 is that present invention interference frequency point rejects step schematic diagram.
Fig. 5 is frequency hopping pattern product process figure of the present invention.
Fig. 6 is shared and communication flow diagram of the receiving-transmitting sides of the present invention to information.
Specific embodiment
Below with reference to embodiment, the present invention is described further.
Embodiment:
As depicted in figs. 1 and 2, a kind of frequency hopping communications anti-interference method based on cognitive radio, the anti-interference method
Including three parts: the anti-interference frequency spectrum window detection method of frequency hopping communications rejects interference frequency point and obtains the method and interference of spectral window
Under the conditions of frequency hopping key share transmission method.
The anti-interference frequency spectrum window detection method of frequency hopping communications, specifically:
A, the bandwidth of entire frequency band and each frequency point according to used in system hops, is divided into several relatively narrow sons
Frequency band；
B, using the frequency spectrum sensing method of cognitive radio energy measuring, all frequency bands supported system carry out the period
Property perception detection, obtain the energy feature of each frequency band；
C, it detects whether there is " spectral window " according to " interference temperature " situation in channel, and is provided according to corresponding criterion
The qualitative character of each " spectral window ".
The method rejected interference frequency point and obtain spectral window, specifically:
A, windowing process and FFT transform are carried out to the signal detected in the above method；
B, statistic in step A is calculated, determines and rejects thresholding；
C, algorithm is rejected using the continuous mean value of FCME(), the frequency for interfering larger unsuitable frequency hopping to use is rejected, is obtained not
" spectral window " of disturbed suitable frequency hopping communications；
D, it according to obtained spectral window and its management information, determines new usable frequency collection, generates new frequency hopping pattern.
Frequency hopping key shares transmission method under the disturbed condition, specifically:
1), newly-generated frequency hopping key information is grouped by the every jump bandwidth limitation of system；
2), by the information after grouping, in conjunction with fountain codes coding rule, formation meets debit under disturbed condition and is easy to receive simultaneously
It is not easy the disturbed information frame just intercepted and captured；
3) after, debit receives integrity key information, ACK confirmation signal is sent to originating party；
4), receiving-transmitting sides start to carry out normal frequency hopping communications according to new frequency hopping pattern.
Implement principle and method:
As shown in Figure 3 and Figure 4, system first detects the electromagnetic spectrum situation in specific frequency hopping frequency range, obtains full
Foot necessarily required several " spectral windows ".Theoretical according to the frequency spectrum perception of cognitive radio, we can will go into frequency hopping
All irrelevant signals in working frequency range regard " main signal " as, and frequency hopping user inherently perceives user, needs before work
The spectrum utilization situation for perceiving surrounding, then could select suitable frequency hopping channel to be communicated.In this way, frequency hopping user just needs
Two work are done in terms of frequency spectrum detection: first is that all frequency hopping channels (frequency hopping point) in detection working frequency range are with the presence or absence of function
Rate is biggish " main signal ", to determine whether the channel can be used；Second is that the situation of change of these channels is periodically detected,
Once occurring high-power " main signal " in certain channels, perception user will detect at the first time it and with most fast speed
Abandon the channel.A), b) and c) top half in three subgraphs is the frequency hopping point and interference signal feelings at a certain moment in Fig. 3
Condition, lower half portion are the spectral window that generates after frequency spectrum detection.The width of interference signal is qualitative to reflect the occupied bandwidth of interference,
The height then qualitative reaction size of jamming power；The width of spectral window reflects the bandwidth of a certain tuftlet usable spectrum, height
Then reflect the quality of the cluster frequency spectrum.
A) assume int 0Signal is not interfered in moment entire frequency hopping working frequency range, then the result of frequency spectrum detection should be every
A frequency hopping channel (point) can just be commonly used to be communicated；
B) assume int 1There are a variety of interference in frequency hopping working frequency range in moment, then being calculated according to specific frequency spectrum detection
Method, then we plan it can be concluded that the spectral window as shown in figure b) lower half portion subgraph according to the characteristic of these spectral windows
Frequency hopping pattern, real-time reliable communication；Equally,
C) assume int 2Moment, a variety of interference were changed in frequency hopping working frequency range, and then usable spectrum window can also move
Shown in state variation (as schemed c) lower half portion subgraph), corresponding frequency hopping pattern will advise again in the spectral window after these variations
It draws.
It is carried out in spectral window detection process to above-mentioned frequency hopping frequency range, since our all interference signals of concern all may be used
To regard " main signal " in broader terms as, it is possible to spectral window is determined using primary user's transmitting terminal detection method,
Detection model is
Wherein, the signal received for this system sension unit for main subscriber signal, that is, interferes, is additive Gaussian
White noise is channel complex gain, indicates judgement amount when (namely spectral window can produce) is not present in main signal, be equally main
There is judgement amount when (not generating corresponding to spectral window in the frequency point) in signal.The model detects the spectral window of frequency hopping frequency range
Problem becomes a typical Hypothesis Testing Problem.Utilize improved FCME algorithm, it is possible to determine that the frequency detected whether be
System hops are available " spectral window ".
Frequency hopping key shares transmission method under the disturbed condition, concrete methods of realizing:
Frequency hopping pattern generation method will be as shown in figure 5, according to the spectral window and its management information detected, system will be determined
New usable frequency collection, generates new frequency hopping pattern.Founding mathematical models are as follows: assuming that when not interfering with, frequency hopping working frequency range
All frequency hopping points as channel space, jump of a certain moment after spectral window detects, contained by the moment all spectral windows
Frequency point constitutes another set, it is clear that the next work of determines that those Frequency points are used for exactly from this subset
Communication.
Frequency hopping key sharing method under disturbed condition, as shown in fig. 6, being threatened system maximum at connection setup initial stage
There are no appearance under normal circumstances for artificial hostile interference, or even if occurring, interference effect is not necessarily best in a short time.
At this point, receiving-transmitting sides are transmitted respective spectral window perception information and are intended on each frequency hopping channel using conventional frequency-hopping mode
Received frequency hopping pattern, both sides shake hands after confirmation, are transferred to cognitive frequency hopping stage of communication, according to the frequency spectrum perception information of other side and
Frequency hopping pattern carries out frequency hopping transmission, to guarantee that recipient is in optimal communication reception status.To guarantee holding for cognitive process
Continuous to carry out, receiving-transmitting sides include the spectral window cognitive assessment at oneself current time in the information data for sending other side and intend connecing
Frequency hopping pattern is received, provides information for the communication transmission of other side's subsequent time.
The description to preferred embodiment provided above, so that any technical staff in the art can be used or utilize this
Invention.The various modifications of these embodiments are evident for personnel skilled in the art, it can be described here total
Principle be applied to each other embodiments without the use of creativeness.Thus, the present invention be not limited to here shown in embodiment,
And it should be according to the widest range for meeting teachings disclosed herein and new feature.
Claims (1)
1. a kind of frequency hopping communications anti-interference method based on cognitive radio, which is characterized in that the anti-interference method includes three
Part: the anti-interference frequency spectrum window detection method of frequency hopping communications is rejected interference frequency point and is obtained under method and the disturbed condition of spectral window
Frequency hopping key shares transmission method；
The anti-interference frequency spectrum window detection method of frequency hopping communications, specifically:
A, the bandwidth of entire frequency band and each frequency point according to used in system hops is divided into several relatively narrow son frequencies
Band；
B, using the frequency spectrum sensing method of cognitive radio energy measuring, all frequency bands supported system carry out periodic
Perception detection, obtains the energy feature of each frequency band；
C, it detects whether there is " spectral window " according to " interference temperature " situation in channel, and is provided according to corresponding criterion each
The qualitative character of " spectral window "；
The method rejected interference frequency point and obtain spectral window, specifically:
A, windowing process and FFT transform are carried out to the signal detected in the anti-interference frequency spectrum window detection method of above-mentioned frequency hopping communications；
B, statistic in step A is calculated, determines and rejects thresholding；
C, algorithm is rejected using continuous mean value, rejects the frequency for interfering larger unsuitable frequency hopping to use, is not disturbed suitable
" spectral window " of frequency hopping communications；
D, it according to obtained spectral window and its management information, determines new usable frequency collection, generates new frequency hopping pattern；It is described
Frequency hopping key shares transmission method under disturbed condition, specifically:
1), newly-generated frequency hopping key information is grouped by the every jump bandwidth limitation of system；
2), by the information after grouping, in conjunction with fountain codes coding rule, formation meets debit under disturbed condition and is easy to receive and be not easy
The disturbed information frame just intercepted and captured；
3) after, debit receives integrity key information, ACK confirmation signal is sent to originating party；
4), receiving-transmitting sides start to carry out normal frequency hopping communications according to new frequency hopping pattern.
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