CN111903235B - Interference method based on channel coding - Google Patents
Interference method based on channel coding Download PDFInfo
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- CN111903235B CN111903235B CN200810077008.2A CN200810077008A CN111903235B CN 111903235 B CN111903235 B CN 111903235B CN 200810077008 A CN200810077008 A CN 200810077008A CN 111903235 B CN111903235 B CN 111903235B
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Abstract
The invention discloses an interference method based on channel coding, and relates to reconnaissance and efficient smart interference technology in the field of communication countermeasure. The closed-loop system is formed by utilizing a reconnaissance subsystem, so that data received by a communication receiving end purposefully contain a certain error pattern, the error correction capability of a communication receiving end is exceeded, the error correction process of the communication receiving end is damaged, the error number of the communication system adopting convolutional coding can be amplified after passing through a decoder, meanwhile, compromise can be carried out on two aspects of interference energy and interference effect, the optimal interference parameter is selected, and the better interference effect is achieved. The invention has the advantages of power saving, strong concealment, flexibility, controllability and the like. The invention is suitable for reconnaissance interference of communication countermeasure and network countermeasure, reconnaissance interference used in systems of battle information support, attack and the like, and is also suitable for application of communication interception and destruction in the aspect of safety.
Description
Technical Field
The invention relates to an interference method based on channel coding in the field of communication countermeasure, which is particularly suitable for reconnaissance interference of communication countermeasure and network countermeasure, reconnaissance interference used in systems of combat information support, attack and the like, and is also suitable for application of communication interception and destruction in the aspect of safety.
Background
At present, in the communication countermeasure system, the interference mode for a single signal has methods such as high-power interference suppression, impulse interference and the like.
High power jamming is a simple and effective way of jamming, but it has the disadvantage of being vulnerable to anti-radiation weapons by exposing the interfering party. Since most wireless communication systems adopt the anti-interference error correction processing procedures such as channel coding and interleaving, if the interference power is reduced, a better interference effect cannot be achieved.
Simple impulse interference concentrates interference power in a certain time period, although partial energy can be saved, the parameter setting of the impulse interference signal is not based, the method is relatively blind, if the parameter setting is not appropriate, the interference effect is not good for a target communication system with stronger error correction capability or interleaving processing, and the optimal interference parameter cannot be found.
Disclosure of Invention
The technical problem to be solved by the invention is to provide an interference method based on channel coding by avoiding the defects in the background technology, which utilizes a reconnaissance subsystem to form a closed loop system, purposefully enables data received by an interference target to contain a certain error pattern, exceeds the error correction capability of the interference target, destroys the error correction process of the interference target, and can also enable the number of errors to be amplified after passing through a decoder for a communication system adopting convolutional coding, and simultaneously can compromise between the interference energy and the interference effect, select the optimal interference parameter and achieve the better interference effect than the background technology. The invention also has the characteristics of power saving, strong concealment, flexibility, controllability and the like.
The technical problem to be solved by the invention is realized by the following steps:
intercepting an interference target signal by a communication reconnaissance subsystem, and performing down-conversion and demodulation processing on the signal to obtain a baseband binary bit code stream;
the communication reconnaissance subsystem carries out de-phase ambiguity and de-IQ reversal processing on the demodulated binary bit code stream, identifies the channel coding mode and parameters of the interference target signal, the interleaving mode and the parameters of the bit code stream after the de-phase ambiguity and the de-IQ reversal processing, analyzes the error correction capability of the interference target and analyzes the time dispersion type of the code word after the transmission signal of the interference target is interleaved;
and the interference subsystem generates and adjusts parameters for controlling the interference signal according to the channel coding mode and parameters of the interference target signal, the interleaving mode and the identification result of the parameters, designs an interference pattern, plans an error pattern of the interference target received data, enables the signal received by the interference target to have a certain error pattern by using small interference energy, exceeds the error correction capability of the signal, destroys the error correction performance of the signal, provides an estimated value of an interference effect and an interference effect curve, and completes the interference based on the channel coding.
The reconnaissance subsystem in the second step of the invention performs the phase ambiguity removal and IQ reversal removal processing on the demodulated binary bit code stream, and the processing is performed according to the frame structure characteristics of the interference target signal.
The reconnaissance subsystem in the second step of the present invention identifies the channel coding mode and parameters of the demodulated bit stream, wherein the channel coding mode includes convolutional coding and block coding, and the channel coding parameters include message length k, codeword length n, generator polynomial, and monitoring matrix.
The reconnaissance subsystem in the second step of the invention identifies the interleaving mode and parameters including whether interleaving exists, the type of interleaving and the depth of interleaving.
The reconnaissance subsystem in the second step of the invention identifies the channel coding mode and parameters of the interference target signal, and establishes a channel coding feature library according to the result of channel coding feature analysis.
The reconnaissance subsystem in the second step of the invention analyzes and calculates the error correction capability of the channel coding of the interference target, and the result comprises the minimum free distance and the coding gain.
The interference subsystem in the third step designs interference pattern, and plans error pattern of data received by communication receiver including error interval, continuous code word number and estimated error bit rate.
The interference subsystem in the third step of the present invention generates and adjusts parameters for controlling interference signals including signal form, transmission time, duration and transmission power.
Compared with the background technology, the invention has the following advantages:
1) the invention adopts the interference mode based on the channel coding, can realize the reduction of the interference power, effectively destroys the anti-interference processing process of the communication channel coding and interleaving, can amplify the error number after passing through a decoder for the coding with the constraint relation between the code words, selects the optimal interference mode, and achieves the compromise of the interference effect and the interference energy.
2) The invention reduces the interference power when carrying out communication countermeasure, designs the interference pattern according to the reconnaissance result, and can use lower interference power to achieve the same interference effect as the traditional interference mode.
3) By designing the interference pattern, the invention can ensure that the attacked party receives the specific error pattern according to the intention of the attacking party, and effectively destroys the anti-interference processing process of channel coding and interleaving of the attacked party.
4) The invention adopts a channel coding mode (such as convolutional coding) with constraint relation for the attacked party, and can utilize the constraint relation among codes to enable the interference effect to generate an amplification effect when passing through a decoder.
5) After the identification and error correction capability analysis process of channel coding and interleaving, the invention can provide a simulation relation curve between the interference parameters and the interference effect (bit error rate after decoding), so that an attacker can select proper interference parameters in the curve according to the attack intention.
Drawings
FIG. 1 is an electrical schematic block diagram of an embodiment of the present invention. In fig. 1: the down-conversion and demodulation module is 1, the channel coding interleaving mode and parameter identification analysis module is 2, the efficient interference signal parameter setting and adjusting module is 3, and the efficient interference signal generating module is 4.
Fig. 2 is a flowchart of the channel coding interleaving mode and the parameter identification principle of the present invention. Fig. 2 illustrates a channel coding interleaving identification process of the demodulated binary bit code stream, which includes phase ambiguity removal, interleaving mode identification, convolutional coding identification, and block coding identification.
FIG. 3 is a schematic diagram of the error correction capability analysis and interference pattern design process according to the present invention. Fig. 3 shows that the error correction capability analysis of the codes is performed according to the channel code identification result, and if an interleaving process exists, an interference pattern exceeding the error correction capability of the interference target is designed by combining the error correction capability analysis result and the interleaving mode.
Detailed Description
Referring to fig. 1 to 3, fig. 1 is an electrical schematic block diagram of an embodiment of the present invention, and includes a down-conversion and demodulation module 1, a channel coding interleaving mode and parameter identification and analysis module 2, an efficient interference signal parameter setting and adjusting module 3, and an efficient interference signal generating module 4. The embodiment system down-conversion and demodulation module 1 performs down-conversion and demodulation processing on the intercepted interference target signal and outputs a binary bit code stream; the channel coding interleaving mode and parameter identification analysis module 2 carries out channel coding, interleaving mode and parameter identification on the input binary bit code stream, and carries out analysis calculation on the error correction capability of the channel coding; the efficient interference signal parameter setting and adjusting module 3 draws a simulation curve of interference parameters and an interference effect according to the comprehensive consideration of the error correction capability analysis result and the interleaving mode, and selects the interference parameters according to the intention of an attacker; the high-efficiency interference signal generation module 4 actually generates an interference signal according to the selected interference parameter, and transmits the interference signal.
The invention comprises the following steps:
the communication reconnaissance subsystem intercepts an interference target signal, and performs down-conversion and demodulation processing on the signal to obtain a baseband binary bit code stream.
The communication reconnaissance subsystem carries out de-phase ambiguity and de-IQ reversal processing on the demodulated binary bit code stream, carries out identification on a channel coding mode and parameters of an interference target signal, an interleaving mode and parameters of the bit code stream subjected to the de-phase ambiguity and the de-IQ reversal processing, and carries out analysis on the error correction capability of the interference target and analysis on the time dispersion type of the code word subjected to the interleaving of the interference target.
The reconnaissance subsystem performs phase ambiguity removal and IQ reversal removal on the demodulated binary bit code stream, and performs processing according to the frame structure characteristics of the interference target signal.
The reconnaissance subsystem identifies the channel coding mode and the parameters of the demodulated bit code stream, wherein the channel coding mode comprises convolutional coding and block coding, and the channel coding parameters comprise message length k, code word length n, generator polynomial and monitoring matrix.
The reconnaissance subsystem identifies the interleaving mode and parameters, including whether interleaving exists, the interleaving type and the interleaving depth.
The reconnaissance subsystem identifies the channel coding mode and parameters of the interference target signal, and establishes a channel coding feature library according to the result of channel coding feature analysis.
The reconnaissance subsystem analyzes and calculates the error correction capability of the channel coding of the interference target, and the result comprises the minimum free distance and the coding gain.
The execution process of channel coding, interleaving mode and parameter identification is shown in fig. 2, and fig. 2 is a working flow chart of the channel coding interleaving mode and parameter identification principle of the present invention. Fig. 2 illustrates a channel coding interleaving identification process of the demodulated binary bit code stream, which includes phase ambiguity removal, interleaving mode identification, convolutional coding identification, and block coding identification. Embodiment of the invention figure 2 works as follows:
1. for the interference target signal subjected to differential coding, the demodulated bit code stream has no phase ambiguity, and can be directly subjected to de-differential coding processing. For an interference target signal which does not adopt differential coding, phase ambiguity brought by a demodulation process must be processed, and the basis for judging a phase ambiguity pattern is a bit field with characteristics in a known data frame, such as a synchronous sequence, and can also be judged by the identification result of subsequent channel coding;
2. the interleaving mode identification method includes an exhaustion method, a matching method and combined channel coding joint identification, for example, if a matrix interleaving row code is a block code of (n, k), and m rows are total, and m is interleaving degree, the code word is a code word of the (mn, mk) interleaving code, and the common factor of n and k is solved according to the identification result of the block code n and k, and the maximum common factor may be the interleaving degree m of the block code matrix interleaving.
3. The linear block code identification process is as follows:
1) correctly dividing the code group and determining a grouping starting point;
2) determining an information code and a check code, and identifying a message length k and a code word length n;
3) and finding out a generator matrix and a check matrix.
4. The convolutional code identification process is as follows:
1) with C (D) H (D)TWhen the bit code stream is equal to 0, a supervised polynomial matrix of the convolutional code is obtained through a simultaneous equation solution, wherein C (D) is the received bit code stream, and H (D) is the supervised polynomial matrix;
2) the matrix is generated according to the invariance factorization theorem by using a supervised polynomial matrix.
5. Establishing a channel coding feature library, establishing a commonly known channel coding feature library, identifying channel coding modes and parameters of a bit code stream by using various coding parameters in the feature library and using a mode matching method, judging the channel coding mode and the parameters with the least bit errors as an identification result, and adding an identified new channel coding pattern into the feature library.
And the interference subsystem generates and adjusts parameters for controlling the interference signal according to the channel coding mode and parameters of the interference target signal, the interleaving mode and the identification result of the parameters, designs an interference pattern, plans an error pattern of data received by a communication receiver, enables the signal received by the communication receiver to have a certain error pattern by using small interference energy, exceeds the error correction capability of the signal, destroys the error correction performance of the signal, provides an estimated value of an interference effect and an interference effect curve, and completes the interference based on the channel coding.
The interference subsystem designs an interference pattern, plans an error pattern of data received by a communication receiver, and comprises an error interval, the number of continuous code words with errors and an estimated bit error rate.
The parameters of the interference subsystem for generating and adjusting the control interference signal include signal form, sending time, duration and sending power.
The error correction capability analysis and interference pattern design flow is shown in fig. 3. FIG. 3 is a schematic diagram of the error correction capability analysis and interference pattern design process according to the present invention. Fig. 3 shows that the error correction capability analysis of the codes is performed according to the channel code identification result, and if an interleaving process exists, an interference pattern exceeding the error correction capability should be designed by combining the error correction capability analysis result and the interleaving mode. Embodiment of the invention figure 3 works as follows:
1. error correction capability analysis
The error correction capability analysis comprises the error correction capability analysis of the block coding and the error correction capability analysis of the convolutional coding, and comprises the following steps:
1) calculating the error correction capability of the general linear block code by the Singelton limit, the Prlottegold limit and the Hamming limit;
2) the error correction capability for convolutional code encoding with maximum likelihood decoding is
dfIn order to be the minimum free distance,
represents the largest integer not exceeding x;
3) the coding gain of the channel coding is calculated. Coding gain refers to the E that can be achieved by coding for a given bit error rateb/N0Is reduced. The upper bound of coding gain can be expressed as
Coding gain is less than or equal to 10log10(rdf)，
Where r is the coding efficiency, dfIs the minimum free distance.
2. Interference pattern design
Interference pattern design interference pulse patterns which enable an attacked party to generate different error patterns are designed according to the error correction capability of various codes, and the interference pulse patterns comprise: signal form, transmission time instant, duration, transmission power.
1) The interference pulse signal form can be noise interference or modulation signal;
2) the transmission time of the interference pulse indicates the time when the interference energy is radiated from the antenna and the time interval of transmission of each interference pulse, which determines the interval of occurrence of error bits;
3) the duration of the interference pulse represents the time of existence of interference energy in the air, and determines the time length of continuous occurrence of the error bit;
4) the transmission power has to be large enough so that the interference of the target signal within the interference pulse will result in a sufficient bit error rate.
The parameters can be initialized by computer simulation by utilizing the identification result of the reconnaissance subsystem, and are dynamically adjusted in the interference process to form a closed-loop system together with the reconnaissance subsystem.
Interference patterns with burst error forms are generated for convolutional coding designs and similar uniformly distributed error forms are generated for each packet for block coding designs. Since interleaving can separate symbols in time, the same interleaving transformation needs to be performed on interference patterns according to an interleaving form, otherwise, the expected interference effect cannot be achieved. The interference pattern design can use less energy, so that after the error bit is transmitted to a decoder of an interference target receiver, the optimal interference mode can also achieve the effect that the bit error rate is amplified after the error bit passes through the decoder for the coding mode with the constraint between the interference target signal code words.
3. Interference signal transmission
And finally, generating an interference signal by the interference subsystem according to the designed interference parameter, and radiating the signal by using a signal transmitting device.
4. Simulation of interference effects
An interference model is established through a computer, an interference process is simulated, a bit error rate generated by interference is calculated, an interference effect is given, the interference effect is fed back to an interference subsystem, and interference parameters are adjusted.
The interference method and system aiming at the channel coding can be used in combat applications of fighting against wireless communication systems such as satellite communication interference, microwave communication interference, tactical communication interference and the like, which apply the channel coding and interleaving technology. The following explains an application embodiment of the system in relation to the communication system.
In a wireless communication system, communication signals are transmitted wirelessly, a wireless transceiving antenna can be used for receiving the communication signals of an interference target system, the reconnaissance function of the system is used for carrying out channel coding and interleaving mode identification, parameter identification and error correction capability analysis on the intercepted signals, an interference subsystem is used for designing an interference pattern according to the intention of an attacker and generating an interference signal sample, a sending device (up-conversion, power amplifier and antenna) is used for sending out the interference signals, the communication link of the interference target system is interfered, the error correction processing process of the interference target system is damaged, the normal communication state is further damaged, and the combat purpose is achieved.
In addition to the above applications, some of the techniques in the interference method for channel coding may be used in other applications of security and defense, as well as in adaptive intelligent communication systems.
Claims (8)
1. An interference method based on channel coding, comprising the steps of:
intercepting an interference target signal by a communication reconnaissance subsystem, and performing down-conversion and demodulation processing on the signal to obtain a baseband binary bit code stream;
the method is characterized by further comprising the following steps:
the communication reconnaissance subsystem carries out de-phase ambiguity and de-IQ reversal processing on the demodulated binary bit code stream, identifies the channel coding mode and parameters of the interference target signal, the interleaving mode and the parameters of the bit code stream after the de-phase ambiguity and the de-IQ reversal processing, analyzes the error correction capability of the interference target and analyzes the time dispersion type of the code word after the transmission signal of the interference target is interleaved;
the interference subsystem and the communication reconnaissance subsystem form a closed-loop system; the interference subsystem generates and adjusts parameters for controlling interference signals according to the channel coding mode and parameters of the interference target signals, the interleaving mode and the identification results of the parameters, designs interference patterns, plans error patterns of the interference target received data, enables the signals received by the interference target to have certain error patterns with small interference energy, exceeds the error correction capability of the signals, destroys the error correction performance of the signals, gives an estimated value of an interference effect and an interference effect curve, and completes interference based on channel coding;
wherein, the interference pattern design in the third step is specifically as follows: the channel coding mode of the interference target signal is convolutional coding, and an interference signal with a burst error form interference pattern is designed and generated; the channel coding mode of the interference target signal is block coding, and an interference signal similar to an interference pattern with a uniformly distributed error form is designed and generated for each block; for the interleaving mode of the interference target signal, the interference signal with the same interleaving transformation pattern is designed and generated.
2. The interference method based on channel coding according to claim 1, characterized in that: and secondly, the reconnaissance subsystem performs phase ambiguity removal and IQ inversion removal on the demodulated binary bit code stream, and performs processing according to the frame structure characteristics of the interference target signal.
3. The interference method based on channel coding according to claim 1, characterized in that: and secondly, the reconnaissance subsystem identifies the channel coding mode and the parameters of the demodulated bit code stream, wherein the channel coding mode comprises convolutional coding and block coding, and the channel coding parameters comprise a message length k, a code word length n, a generator polynomial and a monitoring matrix.
4. The interference method based on channel coding according to claim 1, characterized in that: and secondly, the reconnaissance subsystem identifies the interleaving mode and parameters, including whether interleaving exists, the interleaving type and the interleaving depth.
5. The interference method based on channel coding according to claim 1, characterized in that: secondly, the reconnaissance subsystem identifies the channel coding mode and parameters of the interference target signal, and establishes a channel coding feature library according to the result of channel coding feature analysis.
6. The interference method based on channel coding according to claim 1, characterized in that: and secondly, analyzing and calculating the error correction capability of the channel coding of the interference target by the reconnaissance subsystem, wherein the result comprises the minimum free distance and the coding gain.
7. The interference method based on channel coding according to claim 1, characterized in that: and thirdly, designing an interference pattern by the interference subsystem, wherein the error pattern of the interference target received data comprises error intervals, the number of continuous code words occurring in errors and the estimated bit error rate.
8. The interference method based on channel coding according to claim 1, characterized in that: and thirdly, the interference subsystem generates and adjusts and controls parameters of the interference signal, including signal form, sending time, duration and sending power.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111614360A (en) * | 2020-04-26 | 2020-09-01 | 四川润泽经伟信息技术有限公司 | Carrier interference device based on satellite communication countermeasure system and corresponding decoding method |
| CN111711509A (en) * | 2020-04-26 | 2020-09-25 | 四川润泽经伟信息技术有限公司 | Intelligent user interference system and method based on satellite communication countermeasure |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111614360A (en) * | 2020-04-26 | 2020-09-01 | 四川润泽经伟信息技术有限公司 | Carrier interference device based on satellite communication countermeasure system and corresponding decoding method |
| CN111711509A (en) * | 2020-04-26 | 2020-09-25 | 四川润泽经伟信息技术有限公司 | Intelligent user interference system and method based on satellite communication countermeasure |
| CN111711509B (en) * | 2020-04-26 | 2023-04-28 | 四川润泽经伟信息技术有限公司 | Intelligent user interference system and method based on satellite communication countermeasure |
| CN111614360B (en) * | 2020-04-26 | 2023-10-27 | 四川润泽经伟信息技术有限公司 | Carrier interference device based on satellite communication countermeasure system and corresponding decoding method |
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