CN111934714B - Anti-interference communication method and device - Google Patents

Abstract

The present invention provides an anti-interference communication method and device. The method includes: a transmitting device performs signal frequency hopping processing on a signal to be sent to obtain a frequency hopping signal; an interference device performs interference calculation on the frequency hopping signal to obtain an interference signal; The interference signal is decoded to obtain transmission symbol information. In the case where the distance between the two communicating parties is long and the transmitting power of the transmitting end is small, in the environment of tracking interference, the present invention utilizes the larger interference power of the interfering equipment to help the transmitting end send signals to the receiving end, thereby ensuring the correctness of the signal, At the same time, the interleaving coding and decoding technology is used to enhance the ability to resist burst errors in the communication process.

Description

An anti-interference communication method and device

technical field

The invention mainly relates to the field of communication anti-jamming, and in particular relates to an anti-jamming communication method and device.

Background technique

Frequency hopping communication technology avoids the influence of interference on the signal by hopping the carrier frequency. Its anti-interference and anti-interception performance shows its great superiority in the field of modern communication. Usually, we hope that the law of frequency hopping will not be seen by the interfering party. However, with the development of artificial intelligence, the interfering device can easily perceive the frequency hopping law of both parties in communication, and then conduct frequency tracking interference. Tracking interference can weaken frequency hopping communication like fixed frequency communication and become the biggest threat to frequency hopping communication.

Most of the current methods to deal with frequency tracking interference are based on evasive anti-jamming. However, if the distance between the two communicating parties is long, the transmitting power of the sender is small, and the signal power transmitted on the line will gradually attenuate, which will eventually lead to receiving errors. In addition to anti-interference, we also need to ensure that the receiving end receives the signal correctly in this case. If a repeater is added between the two communication parties, the process from the time the repeater receives the signal to the regeneration of the transmitted signal will cause a delay, and once the repeater fails, it will also have adverse effects.

SUMMARY OF THE INVENTION

The technical problem to be solved by the present invention is to provide an anti-interference communication method and device aiming at the deficiencies of the prior art.

The technical solution of the present invention to solve the above-mentioned technical problems is as follows: an anti-interference communication method, comprising the following steps:

The transmitting device performs signal frequency hopping processing on the signal to be sent to obtain a frequency hopping signal;

The interference device performs interference calculation on the frequency hopping signal to obtain the interference signal;

The receiving device decodes the interference signal to obtain transmission symbol information.

Another technical solution of the present invention to solve the above-mentioned technical problems is as follows: an anti-interference communication device, comprising:

The transmitting device processing module is used for the transmitting device to perform signal frequency hopping processing on the signal to be sent to obtain a frequency hopping signal;

The interference device processing module is used for the interference device to perform interference calculation on the frequency hopping signal to obtain the interference signal;

The receiving device processing module is used for the receiving device to decode and process the interference signal to obtain transmission symbol information.

The beneficial effects of the invention are: the frequency hopping signal is obtained by the frequency hopping processing of the signal to be sent by the transmitting device, and the interference signal is obtained by calculating the interference of the interference device on the frequency hopping signal. In the case of tracking interference, the large interference power of the interfering device is used to help the transmitter send the signal to the receiver, which ensures the correctness of the signal. The receiver decodes the interference signal to obtain the transmission symbol information, using the Interleaving coding and decoding technology enhances the ability to resist burst errors in the communication process.

Description of drawings

FIG. 1 is a schematic flowchart of an anti-jamming communication method provided by an embodiment of the present invention;

FIG. 2 is a structural model diagram of an anti-jamming communication method provided by another embodiment of the present invention;

FIG. 3 is a block diagram of a module of an anti-interference communication device provided by an embodiment of the present invention.

Detailed ways

The principles and features of the present invention will be described below with reference to the accompanying drawings. The examples are only used to explain the present invention, but not to limit the scope of the present invention.

FIG. 1 is a schematic flowchart of an anti-jamming communication method provided by an embodiment of the present invention.

As shown in Figure 1, an anti-jamming communication method includes the following steps:

The transmitting device performs signal frequency hopping processing on the signal to be sent to obtain a frequency hopping signal;

The interference device performs interference calculation on the frequency hopping signal to obtain the interference signal;

The receiving device decodes the interference signal to obtain transmission symbol information.

In the above embodiment, the frequency hopping signal is obtained by the frequency hopping processing of the signal to be sent by the transmitting device, and the interference signal is obtained by the interference calculation of the interference device on the frequency hopping signal. In the environment of tracking interference, the large interference power of the interference device is used to help the transmitter send the signal to the receiver, which ensures the correctness of the signal. The receiver decodes the interference signal to obtain the transmission symbol information, using the interleaving coding The code technology enhances the ability to resist burst errors in the communication process.

Optionally, as an embodiment of the present invention, the transmitting device performs signal frequency hopping processing on the signal to be sent, and the process of obtaining the frequency hopping signal includes:

performing signal coding on the to-be-sent signal to obtain a symbol sequence;

The code interleaver is used to interleave and encode the symbol sequence to obtain a baseband signal;

digitally modulate the baseband signal to obtain a modulated signal;

performing frequency modulation processing on the baseband signal to obtain a frequency modulation carrier;

Transform the FM carrier according to the preset frequency hopping sequence to obtain the carrier to be synthesized;

The carrier to be synthesized is synthesized according to the modulated signal to obtain a frequency hopping signal.

In the above-mentioned embodiment, a symbol sequence is obtained by encoding the signal of the signal to be sent, and a baseband signal is obtained by interleaving and encoding the symbol sequence by a coding interleaver; a modulated signal is obtained by digital modulation of the baseband signal; Frequency modulation processing of the baseband signal to obtain a frequency modulation carrier; transformation processing of the frequency modulation carrier according to a preset frequency hopping sequence to obtain a carrier to be synthesized; The subsequent processing provides reliable signals and ensures the correctness of the signals. At the same time, the interleaving coding and decoding technology is used to enhance the ability to resist burst errors in the communication process.

Optionally, as an embodiment of the present invention, the symbol sequence includes M information sequences, and the process of using an interleaver to interleave and encode the symbol sequence to obtain a baseband signal includes:

Utilize interleaving coding algorithm to input M described information sequences into described coding interleaver for interleaving matrix processing, obtain M×N interleaving coding matrix;

Perform interleaving and coding processing on the M×N interleaving coding matrix in the manner of writing in rows and reading out in columns to obtain a baseband signal d(t), where M is the number of rows and N is the number of columns.

It should be understood that the interleaving coding and decoding process is to encode the M information sequences obtained after channel coding, and use the interleaving coding technique to form an M×N interleaving matrix for the input M information sequences, and the interleaving matrix is arranged in rows. Write and read out by column, and get the baseband signal d(t) after read out.

然后按列读出得到新的码组序列c＝(c₁c₂ c₃ c₄ c₅ c₆)＝(0011 1100 0101 1111 1010 0110)，从而得到二进制基带信号d(t)。Specifically, the to-be-sent signal m(t) is encoded by the source to obtain a binary digital sequence m=010011100101, and the sequence is transmitted in a group of 3 symbols to obtain m=(m1 m2 m3 m4)=(010 011100 101), the channel encoder adds 3 supervisory symbols to the information code group according to certain rules, forming a code group with a length of 6 symbols n=(n ₁ n ₂ n ₃ n ₄ )=(010110 011101 100111 101100), the channel-coded binary digit sequence is read into a 4×6 interleaving matrix row by row to get

Then, a new code group sequence c=(c ₁ c ₂ c ₃ c ₄ c ₅ c ₆ )=(0011 1100 0101 1111 1010 0110) is obtained by reading it out in columns, thereby obtaining the binary baseband signal d(t).

In the above embodiment, the M number of the information sequences are input into the interleaving matrix processing in the coding interleaver by using the interleaving coding algorithm to obtain an M×N interleaving coding matrix; The M×N interleaving coding matrix can be interleaved and coded to obtain baseband signals, which can provide reliable signals for subsequent processing and ensure the correctness of the signals. At the same time, the interleaving coding and coding technology is used to enhance the resistance to burst errors in the communication process. Ability.

Optionally, as an embodiment of the present invention, the baseband signal d(t) includes a baseband frequency function, and the process of performing digital modulation on the baseband signal to obtain a modulated signal includes:

The baseband frequency function is digitally modulated by the first formula to obtain a modulated signal, and the first formula is:

Among them, A(t) is the amplitude modulation function, j is the imaginary unit, s(t) is the modulation signal, and fc( _t ) is the baseband frequency function.

In the above embodiment, the modulated signal is obtained by digitally modulating the baseband frequency function through the first formula, which provides a reliable signal for subsequent processing, and ensures the correctness of the signal. The ability to resist sudden errors in the process.

Optionally, as an embodiment of the present invention, the carrier to be synthesized includes a frequency function of the carrier to be synthesized, and the process of performing synthesis processing on the carrier to be synthesized according to the modulated signal to obtain a frequency hopping signal includes:

The modulation signal and the carrier frequency function to be synthesized are synthesized by the second formula to obtain a frequency hopping signal. The second formula is:

Among them, A(t) is the amplitude modulation function, j is the imaginary unit, s(t) is the frequency hopping signal, f _i ∈ {f ₁ , f ₂ , f ₃ ,..., f _N }, f _ci (t) is the carrier frequency function to be synthesized.

It should be understood that {f ₁ , f ₂ , f ₃ , . . . , f _N } is the set of carrier frequency functions to be synthesized that are hopped according to the frequency hopping sequence.

Specifically, before the baseband signal d(t) modulates the carrier for bandpass transmission, it is extracted from the frequency hopping frequency set {f ₁ , f ₂ , f ₃ ,...,f _N } according to the frequency hopping sequence Corresponding control code, the control code will output the corresponding local oscillator signal within the frequency hopping time interval, and then perform carrier modulation on d(t), the frequency set composed of the frequency points corresponding to each code group is {f ₁ , f ₂ , f ₃ , f ₄ , f ₅ , f ₆ }.

In the above embodiment, the frequency hopping signal is obtained by synthesizing the modulation signal and the carrier frequency function to be synthesized by the second formula, which provides a basis for subsequent signal transmission, ensures the correctness of the signal, and utilizes interleaving coding and decoding. technology, which enhances the ability to resist sudden errors in the communication process.

Optionally, as an embodiment of the present invention, the frequency hopping signal includes a frequency hopping carrier frequency function, the interference device performs interference calculation on the frequency hopping signal, and the process of obtaining the interference signal includes:

Use the frequency tracking interference method to perform interference calculation on the frequency function of the frequency hopping carrier to obtain the interference signal, which is specifically:

The interference calculation is performed on the frequency function of the frequency hopping carrier through the third formula, and the interference signal is obtained, and the third formula is:

f(s(t))=B(t)exp(j2πf _c (t+τ)),

Among them, j is the imaginary unit, f(s(t)) is the interference signal, P(B(t)) >> P(A(t)), f _c (t+τ) is the frequency function of the frequency hopping carrier, τ B(t) is the amplitude modulation function of the interfering signal.

It should be understood that when the interference is frequency tracking interference, after the interference device captures the signal transmitted by the transmitter through perception, it adds high-power narrowband interference noise to the frequency point f _i and sends it to cause interference, the baseband signal. d(t) controls the output of the jamming device, so the jamming signal is related to the modulating signal s(t).

Specifically, within τ time, the interferer perceives and performs statistical analysis on the frequency hopping frequency of the communicating party, calculates the communication frequency used by the current or next hop communicating party, and then adds and modulates the signal s to the predicted frequency band. (t) Correlated interfering signal j(t).

In the above embodiment, the interference signal is obtained by using the frequency tracking interference method to calculate the interference of the frequency function of the frequency hopping carrier, which avoids the influence of the interference on the signal, and ensures the correctness of the signal. The ability to resist burst errors in the communication process.

Optionally, as an embodiment of the present invention, the process of decoding the interference signal by the receiving device to obtain the transmission symbol information includes:

Perform digital demodulation and calculation on the interference signal according to the modulated signal to obtain a received signal;

Perform de-interleaving and decoding processing on the received signal to obtain information to be decoded;

Channel decoding is performed on the information to be decoded to obtain transmission symbol information.

按行写入到去交织器得到矩阵

再按列读出的码组序列为

经过去交织后，每个码组只错了一位，可以纠错，再进行译码就可得到d(t)。Specifically, the receiving end receives the received signal r(t), which includes the modulated signal s(t) and the interference signal j(t) at the transmitting end, if the interfering device does not track the frequency point within the time t f ₃ , then the code group sequence obtained by demodulating the interference signal j(t) is:

Write to the deinterleaver row by row to get the matrix

The code group sequence read out by column is:

After de-interleaving, each code group is only wrong by one bit, which can be corrected, and then d(t) can be obtained by decoding.

In the above embodiment, the received signal is obtained by digital demodulation calculation of the interference signal according to the modulated signal; the information to be decoded is obtained by de-interleaving and decoding processing of the received signal; the channel of the information to be decoded is obtained. The decoding process obtains the transmission symbol information, which ensures the correctness of the signal. At the same time, the interleaving coding and decoding technology is used to enhance the ability to resist burst errors in the communication process.

Optionally, as an embodiment of the present invention, the process of performing digital demodulation and calculation on the interference signal according to the modulated signal to obtain the received signal includes:

The received signal is obtained by performing digital demodulation calculation on the modulated signal and the interference signal by the fourth formula, the fourth formula:

r(t)=s(t)+j(t),

Among them, j(t) is the interference signal, s(t) is the modulated signal, and r(t) is the received signal.

In the above embodiment, the received signal is obtained by calculating the digital demodulation of the modulated signal and the interference signal through the fourth formula, which ensures the correctness of the signal, and at the same time, the interleaving coding and decoding technology is used to enhance the anti-interference ability in the communication process. Burst error capability.

Optionally, as an embodiment of the present invention, the process of performing deinterleaving and decoding processing on the received signal to obtain the information to be decoded includes:

Inputting the received signal into a decoding interleaver of the same type as the encoding interleaver for interleaving matrix processing to obtain an M×N interleaving decoding matrix;

Perform interleaving and decoding processing on the M×N interleaving decoding matrix according to the rules of writing in rows and reading out by columns, to obtain information to be transformed, where M is the number of rows and N is the number of columns;

The information to be transformed is subjected to memoryless independent error transformation processing to obtain the information to be decoded.

It should be understood that de-interleaving and decoding is performed at the receiving end, and the information from the channel is sent into the M×N interleaving matrix of the same type as the interleaver at the transmitting end, and is written in rows and read out in columns, and the information error distribution after reading. Transform into memoryless independent errors.

In the above embodiment, the received signal is input to the interleaving matrix in the decoding interleaver of the same type as the encoding interleaver to obtain an M×N interleaving and decoding matrix; The rules interleave and decode the M×N interleaving and decoding matrix to obtain the information to be transformed; the memoryless independent error transform processing of the information to be transformed obtains the information to be decoded, which ensures the correctness of the signal, and uses the Interleaving coding and decoding technology enhances the ability to resist burst errors in the communication process.

Optionally, as an embodiment of the present invention, as shown in FIG. 2 , it includes a sending device, a receiving device, and an interfering device; the sending end first encodes the signal to be sent to obtain a symbol sequence, and then inputs it to an interleaver for interleaving coding, and then digitally modulate the interleaved and coded symbol sequence to obtain a modulated signal; the frequency hopping sequence controls the frequency synthesis module, so that the frequency hopping carrier is transformed according to the frequency hopping sequence, and the modulated signal is then modulated by the synthesized carrier to obtain The frequency of the transmitted signal is a frequency hopping signal that is hopped according to the frequency hopping sequence; and the process of the receiving end is opposite to that of the transmitting end. After the modulated signal is digitally demodulated, it is decoded after deinterleaving to obtain the final transmission code. Meta information; in this system, the frequency hopping sequence used by the sender must be synchronized with that of the receiver, so that the frequency hopping frequencies of the sender and receiver in the communication can be kept synchronously transformed. The interfering device senses the transmitting frequency point of the transmitting end, and then performs tracking interference.

FIG. 3 is a block diagram of a module of an anti-interference communication device provided by an embodiment of the present invention.

Optionally, as another embodiment of the present invention, as shown in FIG. 3 , an anti-interference communication device includes:

The transmitting device processing module is used for the transmitting device to perform signal frequency hopping processing on the signal to be sent to obtain a frequency hopping signal;

The interference device processing module is used for the interference device to perform interference calculation on the frequency hopping signal to obtain the interference signal;

The receiving device processing module is used for the receiving device to decode and process the interference signal to obtain transmission symbol information.

Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working process of the above-described devices and units may refer to the corresponding processes in the foregoing method embodiments, which will not be repeated here.

In the several embodiments provided in this application, it should be understood that the disclosed apparatus and method may be implemented in other manners. For example, the apparatus embodiments described above are only illustrative. For example, the division of units is only a logical function division. In actual implementation, there may be other division methods, for example, multiple units or components may be combined or integrated. to another system, or some features can be ignored, or not implemented.

Units described as separate components may or may not be physically separated, and components shown as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solutions in the embodiments of the present invention.

In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically alone, or two or more units may be integrated into one unit. The above-mentioned integrated units may be implemented in the form of hardware, or may be implemented in the form of software functional units.

The integrated unit, if implemented as a software functional unit and sold or used as a stand-alone product, may be stored in a computer-readable storage medium. For such understanding, the technical solution of the present invention is essentially or the part that contributes to the prior art, or all or part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage device. The medium includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods of the various embodiments of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, Read-Only Memory (ROM, Read-Only Memory), Random Access Memory (RAM, Random Access Memory), magnetic disk or optical disk and other media that can store program codes .

The above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of various equivalent modifications or modifications within the technical scope disclosed by the present invention. Replacement, these modifications or replacements should all be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims (7)

1. an anti-interference communication method, is characterized in that, comprises the steps: The transmitting device performs signal frequency hopping processing on the signal to be sent to obtain a frequency hopping signal; The interference device performs interference calculation on the frequency hopping signal to obtain the interference signal; The receiving device decodes the interference signal to obtain transmission symbol information; The transmitting device performs signal frequency hopping processing on the signal to be sent, and the process of obtaining the frequency hopping signal includes: performing signal coding on the to-be-sent signal to obtain a symbol sequence; The code interleaver is used to interleave and encode the symbol sequence to obtain a baseband signal; digitally modulate the baseband signal to obtain a modulated signal; performing frequency modulation processing on the baseband signal to obtain a frequency modulation carrier; Transform the FM carrier according to the preset frequency hopping sequence to obtain the carrier to be synthesized; Perform synthesis processing on the carrier to be synthesized according to the modulated signal to obtain a frequency hopping signal; The receiving device performs decoding processing on the interference signal, and the process of obtaining the transmission symbol information includes: Perform digital demodulation and calculation on the interference signal according to the modulated signal to obtain a received signal; Perform de-interleaving and decoding processing on the received signal to obtain information to be decoded; Perform channel decoding processing on the to-be-decoded information to obtain transmission symbol information; The symbol sequence includes M information sequences, and the process of using a coding interleaver to interleave and encode the symbol sequence to obtain a baseband signal includes: Utilize the interleaving coding algorithm to input the M information sequences into the coding interleaver for interleaving matrix processing to obtain an M×N interleaving coding matrix; Perform interleaving and coding processing on the M×N interleaving coding matrix in the manner of writing in rows and reading out in columns to obtain a baseband signal d(t), where M is the number of rows and N is the number of columns. 2. The anti-jamming communication method according to claim 1, wherein the baseband signal d(t) comprises a baseband frequency function, and the process of performing digital modulation on the baseband signal to obtain a modulated signal comprises: The baseband frequency function is digitally modulated by the first formula to obtain a modulated signal, and the first formula is:

Among them, A(t) is the amplitude modulation function, j is the imaginary unit, s(t) is the modulation signal, and fc( _t ) is the baseband frequency function. 3. The anti-interference communication method according to claim 2, wherein the carrier to be synthesized comprises a carrier frequency function to be synthesized, and the carrier to be synthesized is synthesized according to the modulation signal to obtain frequency hopping The process of signaling includes: The modulation signal and the carrier frequency function to be synthesized are synthesized by the second formula to obtain a frequency hopping signal. The second formula is:

Among them, A(t) is the amplitude modulation function, j is the imaginary unit, s _i (t) is the frequency hopping signal, and f _ci (t) is the carrier frequency function to be synthesized. 4. The anti-jamming communication method according to claim 3, wherein the frequency hopping signal comprises a frequency hopping carrier frequency function, the interference device performs interference calculation on the frequency hopping signal, and the process of obtaining the interference signal comprises the following steps: : Use the frequency tracking interference method to perform interference calculation on the frequency function of the frequency hopping carrier to obtain the interference signal, which is specifically: The interference calculation is performed on the frequency function of the frequency hopping carrier through the third formula, and the interference signal is obtained, and the third formula is: f(s(t))=B(t)exp(j2πf _c (t+τ)), Among them, j is the imaginary unit, f(s(t)) is the interference signal, P(B(t)) >> P(A(t)), f _c (t+τ) is the frequency function of the frequency hopping carrier, τ B(t) is the amplitude modulation function of the interfering signal. 5. The anti-jamming communication method according to claim 1, wherein the process of performing digital demodulation and calculation on the interference signal according to the modulated signal to obtain the received signal comprises: The received signal is obtained by performing digital demodulation calculation on the modulated signal and the interference signal by the fourth formula. The fourth formula: r(t)=s(t)+j(t), Among them, j(t) is the interference signal, s(t) is the modulated signal, and r(t) is the received signal. 6. The anti-interference communication method according to claim 1, wherein the process of performing deinterleaving and decoding processing on the received signal to obtain the information to be decoded comprises: Inputting the received signal into a decoding interleaver of the same type as the encoding interleaver for interleaving matrix processing to obtain an M×N interleaving decoding matrix; Perform interleaving and decoding processing on the M×N interleaving decoding matrix according to the rules of writing in rows and reading out by columns, to obtain information to be transformed, where M is the number of rows and N is the number of columns; The information to be transformed is subjected to memoryless independent error transformation processing to obtain the information to be decoded. 7. An anti-interference communication device, characterized in that, comprising: The transmitting device processing module is used for the transmitting device to perform signal frequency hopping processing on the signal to be sent to obtain a frequency hopping signal; The interference device processing module is used for the interference device to perform interference calculation on the frequency hopping signal to obtain the interference signal; a receiving device processing module, used for the receiving device to decode and process the interference signal to obtain transmission symbol information; The transmitting device processing module is specifically used for: performing signal coding on the to-be-sent signal to obtain a symbol sequence; The code interleaver is used to interleave and encode the symbol sequence to obtain a baseband signal; digitally modulate the baseband signal to obtain a modulated signal; performing frequency modulation processing on the baseband signal to obtain a frequency modulation carrier; Transform the FM carrier according to the preset frequency hopping sequence to obtain the carrier to be synthesized; Perform synthesis processing on the carrier to be synthesized according to the modulated signal to obtain a frequency hopping signal; The receiving device processing module is specifically used for: Perform digital demodulation and calculation on the interference signal according to the modulated signal to obtain a received signal; Perform de-interleaving and decoding processing on the received signal to obtain information to be decoded; performing channel decoding processing on the to-be-decoded information to obtain transmission symbol information; The symbol sequence includes M information sequences, and the transmitting device processing module is further configured to: Utilize the interleaving coding algorithm to input the M information sequences into the coding interleaver for interleaving matrix processing to obtain an M×N interleaving coding matrix; Perform interleaving and coding processing on the M×N interleaving coding matrix in the manner of writing in rows and reading out in columns to obtain a baseband signal d(t), where M is the number of rows and N is the number of columns.

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