CN111970219B - Method for generating single carrier digital modulation interference signal and interference case base - Google Patents
Method for generating single carrier digital modulation interference signal and interference case base Download PDFInfo
- Publication number
- CN111970219B CN111970219B CN202010894481.0A CN202010894481A CN111970219B CN 111970219 B CN111970219 B CN 111970219B CN 202010894481 A CN202010894481 A CN 202010894481A CN 111970219 B CN111970219 B CN 111970219B
- Authority
- CN
- China
- Prior art keywords
- signal
- interference
- module
- modulation
- interference signal
- 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
Links
Images
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/0008—Modulated-carrier systems arrangements for allowing a transmitter or receiver to use more than one type of modulation
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04K—SECRET COMMUNICATION; JAMMING OF COMMUNICATION
- H04K3/00—Jamming of communication; Counter-measures
- H04K3/40—Jamming having variable characteristics
- H04K3/44—Jamming having variable characteristics characterized by the control of the jamming waveform or modulation type
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
- H04L25/03828—Arrangements for spectral shaping; Arrangements for providing signals with specified spectral properties
- H04L25/03834—Arrangements for spectral shaping; Arrangements for providing signals with specified spectral properties using pulse shaping
Abstract
A method for generating a single carrier digital modulation interference signal and an interference case library belongs to the technical field of wireless communication interference. The method takes a binary single-carrier digital modulation signal as a research object, and researches the generation method of an interference signal and an interference case base of the signal under an additive white Gaussian noise channel. The method is realized by an interference signal generating system which comprises an interference signal generating module, an interference case base and an interference decision module. The system generates an interference signal which can enable the error rate of a communication signal modulated by single carrier digital to be effective actually through an interference signal generating module, changes the parameters of the communication signal, inputs the generated interference signal into an interference case library for accumulation, and finally outputs the interference signal which is suitable for the resources of the existing interference equipment for the enemy communication signal intercepted by the interference machine through an interference decision module, thereby being closer to the actual application occasion.
Description
Technical Field
The invention relates to a method for generating a single carrier digital modulation interference signal and an interference case library, belonging to the technical field of wireless communication interference.
Background
In modern war, communication in military communication plays a key role in fighting against attack and defense. The communication countermeasure is a combat action performed by both enemies by using electronic technology. The aim is to weaken and destroy the combat use efficiency of the enemy radio communication system and ensure the normal performance of the own radio communication system. Communication countermeasure broadly includes: radio communication counterreconnaissance, radio communication interference and radio communication electronic defense. The radio communication interference is to use a radio communication interference device to emit a special interference signal, destroy or disturb wireless communication of an adversary, and is an attack means in communication countermeasure.
The method is characterized in that the best interference pattern of a signal under an additive white Gaussian noise channel is researched by taking a binary single-carrier digital modulation signal as a research object based on radio communication interference in communication countermeasure as a background. Domestic and foreign research shows that effective interference of signals should meet time domain, frequency domain and power criteria. That is, measures as effective as possible are taken in the time domain to ensure that the interference and the communication signal coincide in time; the interference is guaranteed to be consistent with the carrier frequency and bandwidth of the communication signal in the frequency domain. For the communication reconnaissance system, due to the lack of prior knowledge of the intercepted communication signals, the interference signals and the communication signals can only be approximately coincided in the time domain and the frequency domain. At this time, the performance loss caused by the insufficient overlapping degree of the interference signal and the communication signal in the time domain and the frequency domain is compensated by means of increasing the power of the interference signal, so as to achieve the optimal interference. In addition, for the interfering device, the available interference resources of different interfering devices are limited, and parameters such as transmission power, carrier frequency, transmission rate, etc. are all limited by objective factors, so for a communication signal with certain parameters, we need to find one or more interfering signals to select a suitable interfering signal according to the specific situation of the interfering device.
In recent years, many documents have studied the optimal interference pattern of a single carrier digital signal under an additive white gaussian noise channel, most of them design the interference pattern of an interference signal under the premise of obtaining accurate communication signal parameters, and the authors have studied the optimal interference pattern of a single/multi-carrier digital modulation signal in "D ]" [ harbin: the best interference pattern of a binary single carrier digital modulation signal is researched in Harbin engineering university, 2018, but the designed interference pattern is limited to relevant interference, and the influence of the frequency of the interference signal on the interference effect is not considered.
Disclosure of Invention
In order to overcome the defects and shortcomings of the prior art, the invention provides a single carrier digital modulation interference signal and an interference case library generation method, so that electronic equipment of an enemy can be effectively disturbed and can not work normally.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a method for generating a single carrier digital modulation interference signal and an interference case base is realized by an interference signal generating system, wherein the system comprises an interference signal generating module, an interference case base and an interference decision module; the interference signal generation module is connected with an interference case library, and the interference case library is connected with the interference decision module; the interference signal generation module comprises a signal source generation module A, a signal source generation module B, a pulse forming module A, a pulse forming module B, a signal modulation module A, a signal modulation module B, a channel, a coherent demodulation module, a code element synchronization module, a sampling judgment module and a bit error rate judgment module; wherein the coherent demodulation module comprises a coherent carrier wave generator, a multiplier and a low-pass filter; the interference signal generation module is connected with a source generation module A and a pulse shaping module A, and the output end of the pulse shaping module A is connected with the input end of a signal modulation module A; the signal source generating module B is connected with the pulse forming module B, and the output end of the pulse forming module B is connected to the input end of the signal modulating module B; the output ends of the signal modulation module A and the signal modulation module B are both connected to a channel and are connected to a coherent demodulation module through the output end of the channel, the output end of the coherent demodulation module is connected to a code element synchronization module, the output end of the code element synchronization module is connected to a sampling judgment module, and the output end of the sampling judgment module is connected to a bit error rate judgment module; the output end of the information source generating module A is connected with the input end of the sampling judgment module, and the method for generating the interference signal and the interference case library comprises the following specific steps:
1) the signal source generating module A generates 0, 1 equi-distributed discrete signal source sequence { an}，anIs the level of the nth symbol, which takes the value of 0 or 1; the signal source generating module B generates 0, 1 equi-distributed discrete signal source sequence { ajn}，ajnIs the level of the nth symbol, which takes the value of 0 or 1;
2) discrete source sequence anOutput baseband signal after passing through pulse forming module A
Discrete source sequence ajnOutputs baseband signals after passing through a pulse forming module B
Wherein T represents time, g (T) is a baseband pulse, TsFor symbol spacing, assume for simplicity that g (t) isHeight of 1 and width of TsThe rectangular pulse of (2);
3) the signal modulation module a modulates a baseband signal s (t) in one of 2ASK, BPSK, and 2FSK, and generates a modulated signal e (t) in the following specific modulation modes:
(1) if the modulation mode is 2 ASK: e (t) s (t) cos2 pi fct, wherein fcIs the carrier frequency;
(2) if the modulation mode is 2 FSK: e (t) ═ s1(t)cos(2πf1t)+s2(t)cos(2πf2t) wherein f1、f2Respectively two carrier frequencies in a 2FSK modulation,
is anThe complement level of (i.e. when a)nWhen equal to 0
anWhen 1 is true
(3) If the modulation mode is BPSK: e (t) ═ s1(t)cos(2πfct)+s2(t)cos(2πfct + pi), wherein fcIs the carrier frequency and is,
the same meaning as in the step (2);
following steps (1) - (3), the signal modulation module B processes the baseband signal sj(t) modulating in one of 2ASK, BPSK and 2FSK to generate interference signals j (t);
4) after the modulated signal e (t) and the interference signal j (t) pass through the channel, the output signal r (t) ═ e (t) + n (t) + j (t), wherein n (t) is gaussian noise;
5) coherent demodulation is carried out on output signal r (t) after passing through channel, a coherent carrier wave generator in a coherent demodulation module provides a coherent carrier wave which is strictly synchronous with the carrier wave of modulated signal e (t), after the coherent carrier wave is multiplied by output signal r (t) after passing through channel, low-frequency component is taken out by a low-pass filter, and the low-frequency component is recovered baseband signal sd(t)；
6) The recovered baseband signal sd(t) symbol synchronization is performed by a symbol synchronization module to remove the delay caused by the low-pass filter, and a synchronized baseband signal s 'is obtained'd(t)；
7) Synchronized baseband signal s'd(t) after sampling judgment by the sampling judgment module, the signal is compared with the discrete signal source sequence { anComparing to obtain the error rate P of the systeme；
8) Respectively changing the modulation mode, carrier frequency and symbol interval of the interference signal, repeating the processes of the steps 2) to 7), drawing a system error rate curve under the condition that the interference signal with different parameters interferes the communication signal, and judging the interference signal when the error rate reaches 10% as an actual effective interference signal according to the error rate curve;
9) inputting the actual effective interference signals into an interference case library for stacking, wherein the combination of each interference signal and the corresponding modulated signal is used as a case; when intercepting and capturing the communication signal of the enemy, the interference decision module selects a corresponding interference signal from the interference case library to interfere the communication signal of the enemy, namely the interference signal corresponding to the modulated signal e (t) which is the same as the modulation mode, carrier frequency, code element rate and transmitting power of the communication signal of the enemy and exists in the interference case library; when the intercepted enemy communication signal has no corresponding modulated signal in the interference case library, the interference signal suitable for the intercepted enemy communication signal is generated through a data fitting method according to the case in the interference case library and the resources of the current interference equipment.
In the 2ASK modulation mode, ASK is an abbreviation of English Amplitude Shift Keying and means a binary Amplitude Keying modulation mode;
in the BPSK modulation mode, BPSK is an abbreviation of English Binary Phase Shift Keying and means a Binary Phase Shift Keying modulation mode;
in the 2FSK modulation scheme, FSK is an abbreviation of english Frequency Shift Keying, and means a binary Frequency Shift Keying modulation scheme.
When an intercepted enemy communication signal has no corresponding interference signal in an interference case library, generating the interference signal suitable for the intercepted enemy communication signal by a data fitting method according to cases in the interference signal case library and the resources of the current interference equipment, wherein the generation method comprises the following steps:
(1) searching and matching enemy communication signals intercepted by the jammer and modulated signals in the jamming case library, wherein the purpose of searching and matching is to find K cases in the jamming case library, wherein the modulated signals in the cases are most similar to the intercepted enemy communication signals; the searching and matching process is realized by a nearest neighbor method based on Euclidean distance, wherein each attribute of the communication signal, namely the carrier frequency, the modulation mode, the code element rate and the sending power of the communication signal, of the nearest neighbor method determines a weight through a particle swarm algorithm, the algorithm uses the weight to weight and calculate the weighted Euclidean distance between the intercepted communication signal and the communication signal in the case library, and K communication signals with the minimum weighted Euclidean distance between the intercepted communication signal and the intercepted enemy communication signal in the interference case library are found.
(2) And recording the distance between the K communication signals and the intercepted enemy communication signals, taking the reciprocal of the distance and normalizing the reciprocal of the distance to be used as K weights, taking weighted average of interference signals corresponding to the K communication signals by using the weights, and taking the interference signals obtained after weighted average as interference signals suitable for the intercepted enemy communication signals.
The value of K in the method is generally determined according to experience, and the value of K in the method is 2.
Parameters of communication signals in simulation are determined according to parameters of an actual military short-wave radio station, and the modulation mode of the communication signals is one of BPSK, 2ASK and 2 FSK; the carrier frequency, i.e., the frequency point, of the communication signal with the modulation scheme of BPSK and 2ASK is 3.6MHz, and the two frequency points of the communication signal with the modulation scheme of 2FSK are 2.4MHz and 3.6MHz, respectively; the code element rate is Rs which is 56 kbit/s; the transmission power Ps is 5W. Under the conditions that the SNR value is 5dB, the ISR value is in the range of-10 to 4dB and the interval is 1 dB. Respectively changing the modulation mode, carrier frequency and code element rate of the interference signal, and analyzing the change of interference effect caused by different interference signal parameters under the condition that the interference signal is incoherent with a transmitted signal;
according to the GJB 6741-2009 evaluation criteria for digital communication interference effect, when the bit error rate of a digital communication system using a binary random sequence as an information source reaches 7.5%, the interference is considered to be strong, and when the bit error rate reaches 10%, the normal communication cannot be considered. According to the evaluation standard, the invention selects an interference signal with the error rate of 10% as an alternative interference scheme;
during simulation, parameters of communication signals are fixed (the communication signal parameters are from the communication signal data generated according to the parameters of the enemy radio station), parameters of interference signals are changed, system error rate curves under the interference signals with different parameters are drawn, and the interference signals meeting requirements are found from the curve chart to serve as interference schemes of the communication signals.
The interference signal and the communication signal are modulated differently:
the symbol rate Rj of the fixed interference signal is 56 kbit/s; the carrier frequency of the interference signal with the modulation scheme BPSK or 2ASK, that is, the frequency bin fcs is 3.6MHz, and the two frequency bins of the interference signal with the modulation scheme 2FSK are fj1 is 2.4MHz and fj2 is 3.6MHz, and the modulation schemes for changing the interference signal are BPSK, 2FSK and 2ASK, respectively. For a communication signal with the modulation mode of BPSK, the interference signal with the modulation mode of BPSK can achieve the requirement that the system error rate cannot achieve normal communication when the transmission power is 2.82W, the interference signal with the modulation modes of 2FSK and 2ASK can achieve the same interference effect when the transmission power is 4.28W, because the error rate of the whole system is greater than 10% when the modulation mode of the communication signal is 2ASK, normal communication cannot be achieved, the condition that the modulation mode of the communication signal is 2ASK is not considered in the following process, for a communication signal with the modulation mode of 2FSK, the interference signal with the modulation mode of BPSK can achieve the requirement that the system error rate cannot achieve normal communication when the transmission power is 1.87W, and the interference signal with the modulation modes of 2FSK and 2ASK can achieve the same interference effect when the transmission powers are 1.83W and 3.39W, respectively.
The interfering signal is at a different symbol rate than the communication signal:
the modulation mode of the fixed interference signal of the communication signal with the modulation modes of BPSK and 2FSK is the same as that of the communication signal; under the condition that the frequency point of the interference signal with the fixed modulation mode of BPSK is fj to 3.6MHz, and the two frequency points of the interference signal with the modulation mode of 2FSK are fj1 to 2.4MHz and fj2 to 3.6MHz, the symbol rates of the interference signal are changed to 0.5Rs, 2Rs and 3Rs respectively, wherein the Rs is the communication signal symbol rate. From the simulation results, it can be found that the symbol rate of the interference signal has no influence on the interference effect of the interference signal. When the transmission power of the interference signal with the modulation modes of BPSK and 2FSK is respectively 2.82W and 1.84W, the requirement that the system error rate can not be normally communicated can be met.
The interference signal is different from the communication signal carrier frequency:
the modulation modes of the fixed interference signals are BPSK and 2FSK which are the same as the communication signals respectively; under the condition that the code element rate is Rj which is 56kbit/s, the frequency point fj which changes the interference signal modulation mode into BPSK and the first frequency point fj1 which changes the interference signal modulation mode into 2FSK are fcs, 1.005fcs, 1.01fcs, 1.015fcs, 1.02fcs, 1.025fcs, 1.03fcs and 1.035fcs respectively, and under the condition that the interval between two frequency points which fixes the interference signal modulation mode into 2FSK is 1.2MHz, the required transmission power under the condition that the system error rate is guaranteed to be 10% is determined through simulation. Under the above conditions, the transmission powers at which the system cannot normally communicate when the communication signal modulation scheme is BPSK are 2.82W, 4.72W, 4.91W, 4.76W, 5.86W, 5.01W, 4.73W, and 4.88W, respectively, and the transmission powers at which the system cannot normally communicate when the communication signal modulation scheme is 2FSK are 1.86W, 3.19W, 3.52W, 3.35W, 3.58W, 3.32W, 3.74W, and 2.15W, respectively.
The invention has the following beneficial effects: it is possible to generate a plurality of interference signals for a communication signal of which one modulation scheme is BPSK, 2FSK, or 2 ASK. The method can select a suitable interference signal according to the specific situation of the interference equipment, and is closer to practical application.
Drawings
FIG. 1 is a block diagram of the system of the present invention.
Fig. 2 is a bit error rate curve when the modulation scheme of the interference signal changes when the modulation scheme of the communication signal is BPSK. As shown in fig. 2, the carrier frequency and symbol rate of the fixed interference signal are the same as those of the communication signal, the modulation modes of the fixed interference signal are changed to BPSK, 2FSK and 2ASK, and the power of the fixed interference signal is changed to obtain a system error rate curve graph. The transmission power of the interference signal required for making the system error rate reach 10% can be obtained from the graph, and for the BPSK + BPSK mode, the power can be determined to be 2.82W; for the BPSK +2ASK and BPSK +2FSK modes, the power is determined to be 4.28W.
Fig. 3 is a bit error rate curve when the modulation scheme of the interference signal changes when the modulation scheme of the communication signal is 2 ASK. In the figure, it can be found that the error rate of the whole system is always greater than 10%, so that the system cannot normally communicate when the communication signal is 2ASK, and the situation that the communication signal is 2ASK is not considered any more in the following.
Fig. 4 is a bit error rate curve when the modulation scheme of the interference signal changes when the modulation scheme of the communication signal is 2 FSK. For 2FSK + BPSK, the power can be determined to be 1.87W; for 2FSK +2FSK, the power can be determined to be 1.83W; for the 2FSK +2ASK mode, the power can be determined to be 3.39W.
Fig. 5 is a bit error rate curve when the symbol rate of the interference signal changes when both the modulation modes of the communication signal and the interference signal are BPSK. As shown in fig. 5, the carrier frequency and modulation mode of the fixed interference signal are the same as those of the communication signal, the symbol rates of the interference signal are changed to 0.5Rs, 2Rs, and 3Rs, where Rs is the symbol rate of the communication signal, and the power of the interference signal is changed to obtain the system error rate curve. The sending power of the interference signal required for making the error rate of the system reach 10% can be obtained from the graph, and the graph can determine that the four curves are completely overlapped, so that the symbol rate of the interference signal has no influence on the error rate of the system, and therefore, for the four ways that the symbol rate of the interference signal is respectively 0.5Rs, 2Rs and 3Rs, the sending power of the interference signal can be determined to be 2.82W.
Fig. 6 is a bit error rate curve when the symbol rate of the interference signal changes when both the modulation modes of the communication signal and the interference signal are 2 FSK. In the figure, four ways of determining the symbol rates of 0.5Rs, 2Rs and 3Rs for the interference signal are determined, and the transmission power of the interference signal is determined to be 1.84W.
Fig. 7 is a bit error rate curve when the carrier frequency of the interference signal changes when both the modulation modes of the communication signal and the interference signal are BPSK. As shown in fig. 7, the fixed interference signal modulation method is the same as the symbol rate as the communication signal, the carrier frequency of the interference signal is changed, and the power of the interference signal is changed to obtain the system error rate graph. The interference signal transmission power required for the system error rate to reach 10% can be obtained from the graph; in the figure, it can be determined that the frequency points of the interference signal are 8 types, i.e., fcs, 1.005fcs, 1.01fcs, 1.015fcs, 1.02fcs, 1.025fcs, 1.03fcs, and 1.035fcs, respectively, and the transmission power of the interference signal is 2.82W, 4.72W, 4.91W, 4.76W, 5.86W, 5.01W, 4.73W, and 4.88W, respectively.
Fig. 8 is a bit error rate curve when the carrier frequency of the interference signal changes when both the modulation modes of the communication signal and the interference signal are 2 FSK. In the figure, it can be determined that the first frequency points of the interference signal are 8 types, i.e., fcs, 1.005fcs, 1.01fcs, 1.015fcs, 1.02fcs, 1.025fcs, 1.03fcs, and 1.035fcs, respectively, and the transmission power of the interference signal is 1.86W, 3.19W, 3.52W, 3.35W, 3.58W, 3.32W, 3.74W, and 2.15W, respectively.
Detailed Description
The invention is further described below, but not limited to, with reference to the following figures and examples.
Example (b):
a method for generating a single carrier digital modulation interference signal and an interference case library is realized by an interference signal generation system, as shown in figure 1, the system comprises an interference signal generation module, an interference case library and an interference decision module; the interference signal generation module is connected with an interference case library, and the interference case library is connected with the interference decision module; the interference signal generation module comprises a signal source generation module A, a signal source generation module B, a pulse forming module A, a pulse forming module B, a signal modulation module A, a signal modulation module B, a channel, a coherent demodulation module, a code element synchronization module, a sampling judgment module and a bit error rate judgment module; wherein the coherent demodulation module comprises a coherent carrier wave generator, a multiplier and a low-pass filter; the interference signal generation module is connected with a source generation module A and a pulse shaping module A, and the output end of the pulse shaping module A is connected with the input end of a signal modulation module A; the signal source generating module B is connected with the pulse forming module B, and the output end of the pulse forming module B is connected to the input end of the signal modulating module B; the output ends of the signal modulation module A and the signal modulation module B are both connected to a channel and are connected to a coherent demodulation module through the output end of the channel, the output end of the coherent demodulation module is connected to a code element synchronization module, the output end of the code element synchronization module is connected to a sampling judgment module, and the output end of the sampling judgment module is connected to a bit error rate judgment module; the output end of the information source generating module A is connected with the input end of the sampling judgment module, and the method for generating the interference signal and the interference case library comprises the following specific steps:
1) the signal source generating module A generates 0, 1 equi-distributed discrete signal source sequence { an}，anIs the level of the nth symbol, which takes the value of 0 or 1; the signal source generating module B generates 0, 1 equi-distributed discrete signal source sequence { ajn}，ajnIs the level of the nth symbol, which takes the value of 0 or 1;
2) discrete source sequence anOutput baseband signal after passing through pulse forming module A
Discrete source sequence ajnOutputs baseband signals after passing through a pulse forming module B
Wherein T represents time, g (T) is a baseband pulse, TsFor symbol spacing, assume for simplicity that g (T) is 1 in height and T in widthsThe rectangular pulse of (2);
3) the signal modulation module a modulates a baseband signal s (t) in one of 2ASK, BPSK, and 2FSK, and generates a modulated signal e (t) in the following specific modulation modes:
(1) if the modulation mode is 2 ASK: e (t) s (t) cos2 pi fct, wherein fcIs the carrier frequency;
(2) if the modulation mode is 2 FSK: e (t) ═ s1(t)cos(2πf1t)+s2(t)cos(2πf2t) wherein f1、f2Respectively two carrier frequencies in a 2FSK modulation,
is anThe complement level of (i.e. when a)nWhen equal to 0
anWhen 1 is true
(3) If the modulation mode is BPSK: e (t) ═ s1(t)cos(2πfct)+s2(t)cos(2πfct + pi), wherein fcIs the carrier frequency and is,
the same meaning as in the step (2);
following steps (1) - (3), the signal modulation module B processes the baseband signal sj(t) modulating in one of 2ASK, BPSK and 2FSK to generate interference signals j (t);
4) after the modulated signal e (t) and the interference signal j (t) pass through the channel, the output signal r (t) ═ e (t) + n (t) + j (t), wherein n (t) is gaussian noise;
5) coherent demodulation of the output signal r (t) after the channel passage, by phaseA coherent carrier wave generator in the dry demodulation module provides a coherent carrier wave which is strictly synchronous with the carrier wave of the modulated signal e (t), after the coherent carrier wave is multiplied by the output signal r (t) after passing through the channel, a low-frequency component is taken out by a low-pass filter, and the low-frequency component is a recovered baseband signal sd(t)；
6) The recovered baseband signal sd(t) symbol synchronization is performed by a symbol synchronization module to remove the delay caused by the low-pass filter, and a synchronized baseband signal s 'is obtained'd(t)；
7) Synchronized baseband signal s'd(t) after sampling judgment by the sampling judgment module, the signal is compared with the discrete signal source sequence { anComparing to obtain the error rate P of the systeme；
8) Respectively changing the modulation mode, carrier frequency and symbol interval of the interference signal, repeating the processes of the steps 2) to 7), drawing a system error rate curve under the condition that the interference signal with different parameters interferes the communication signal, and judging the interference signal as an actual effective interference signal when the error rate reaches 10% according to the error rate curve as shown in fig. 2 to 8;
9) inputting the actual effective interference signals into an interference case library for stacking, wherein the combination of each interference signal and the corresponding modulated signal is used as a case; when intercepting and capturing the communication signal of the enemy, the interference decision module selects a corresponding interference signal from the interference case library to interfere the communication signal of the enemy, namely the interference signal corresponding to the modulated signal e (t) which is the same as the modulation mode, carrier frequency, code element rate and transmitting power of the communication signal of the enemy and exists in the interference case library; when the intercepted enemy communication signal has no corresponding modulated signal in the interference case library, the interference signal suitable for the intercepted enemy communication signal is generated through a data fitting method according to the case in the interference case library and the resources of the current interference equipment.
Claims (1)
1. A method for generating a single carrier digital modulation interference signal and an interference case base is realized by an interference signal generating system, wherein the system comprises an interference signal generating module, an interference case base and an interference decision module; the interference signal generation module is connected with an interference case library, and the interference case library is connected with the interference decision module; the interference signal generation module comprises a signal source generation module A, a signal source generation module B, a pulse forming module A, a pulse forming module B, a signal modulation module A, a signal modulation module B, a channel, a coherent demodulation module, a code element synchronization module, a sampling judgment module and a bit error rate judgment module; wherein the coherent demodulation module comprises a coherent carrier wave generator, a multiplier and a low-pass filter; the interference signal generation module is connected with a source generation module A and a pulse shaping module A, and the output end of the pulse shaping module A is connected with the input end of a signal modulation module A; the signal source generating module B is connected with the pulse forming module B, and the output end of the pulse forming module B is connected to the input end of the signal modulating module B; the output ends of the signal modulation module A and the signal modulation module B are both connected to a channel and are connected to a coherent demodulation module through the output end of the channel, the output end of the coherent demodulation module is connected to a code element synchronization module, the output end of the code element synchronization module is connected to a sampling judgment module, and the output end of the sampling judgment module is connected to a bit error rate judgment module; the output end of the information source generating module A is connected with the input end of the sampling judgment module, and the method for generating the interference signal and the interference case library comprises the following specific steps:
1) the signal source generating module A generates 0, 1 equi-distributed discrete signal source sequence { an}，anIs the level of the nth symbol, which takes the value of 0 or 1; the signal source generating module B generates 0, 1 equi-distributed discrete signal source sequence { ajn}，ajnIs the level of the nth symbol, which takes the value of 0 or 1;
2) discrete source sequence anOutput baseband signal after passing through pulse forming module A
Discrete source sequence ajnOutputs baseband signals after passing through a pulse forming module B
In the formula (I), the compound is shown in the specification,t represents time, g (T) is a baseband pulse, TsFor symbol spacing, assume for simplicity that g (T) is 1 in height and T in widthsThe rectangular pulse of (2);
3) the signal modulation module a modulates a baseband signal s (t) in one of 2ASK, BPSK, and 2FSK, and generates a modulated signal e (t) in the following specific modulation modes:
(1) if the modulation mode is 2 ASK: e (t) s (t) cos2 pi fct, wherein fcIs the carrier frequency;
(2) if the modulation mode is 2 FSK: e (t) ═ s1(t)cos(2πf1t)+s2(t)cos(2πf2t) wherein f1、f2Respectively two carrier frequencies in a 2FSK modulation,
is anThe complement level of (i.e. when a)nWhen equal to 0
anWhen 1 is true
(3) If the modulation mode is BPSK: e (t) ═ s1(t)cos(2πfct)+s2(t)cos(2πfct + pi), wherein fcIs the carrier frequency and is,
the same meaning as in the step (2);
following steps (1) - (3), the signal modulation module B processes the baseband signal sj(t) modulation in 2ASK, BPSK, or 2FSKOne, generated as an interference signal j (t);
4) after the modulated signal e (t) and the interference signal j (t) pass through the channel, the output signal r (t) ═ e (t) + n (t) + j (t), wherein n (t) is gaussian noise;
5) coherent demodulation is carried out on output signal r (t) after passing through channel, a coherent carrier wave generator in a coherent demodulation module provides a coherent carrier wave which is strictly synchronous with the carrier wave of modulated signal e (t), after the coherent carrier wave is multiplied by output signal r (t) after passing through channel, low-frequency component is taken out by a low-pass filter, and the low-frequency component is recovered baseband signal sd(t)；
6) The recovered baseband signal sd(t) symbol synchronization is performed by a symbol synchronization module to remove the delay caused by the low-pass filter, and a synchronized baseband signal s 'is obtained'd(t)；
7) Synchronized baseband signal s'd(t) after sampling judgment by the sampling judgment module, the signal is compared with the discrete signal source sequence { anComparing to obtain the error rate P of the systeme；
8) Respectively changing the modulation mode, carrier frequency and symbol interval of the interference signal, repeating the processes of the steps 2) to 7), drawing a system error rate curve under the condition that the interference signal with different parameters interferes the communication signal, and judging the interference signal when the error rate reaches 10% as an actual effective interference signal according to the error rate curve;
9) inputting the actual effective interference signals into an interference case library for stacking, wherein the combination of each interference signal and the corresponding modulated signal is used as a case; when intercepting and capturing the communication signal of the enemy, the interference decision module selects a corresponding interference signal from the interference case library to interfere the communication signal of the enemy, namely the interference signal corresponding to the modulated signal e (t) which is the same as the modulation mode, carrier frequency, code element rate and transmitting power of the communication signal of the enemy and exists in the interference case library; when the intercepted enemy communication signal has no corresponding modulated signal in the interference case library, the interference signal suitable for the intercepted enemy communication signal is generated through a data fitting method according to the case in the interference case library and the resources of the current interference equipment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010894481.0A CN111970219B (en) | 2020-08-31 | 2020-08-31 | Method for generating single carrier digital modulation interference signal and interference case base |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010894481.0A CN111970219B (en) | 2020-08-31 | 2020-08-31 | Method for generating single carrier digital modulation interference signal and interference case base |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111970219A CN111970219A (en) | 2020-11-20 |
| CN111970219B true CN111970219B (en) | 2021-06-29 |
Family
ID=73400372
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010894481.0A Active CN111970219B (en) | 2020-08-31 | 2020-08-31 | Method for generating single carrier digital modulation interference signal and interference case base |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111970219B (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102916752A (en) * | 2012-05-07 | 2013-02-06 | 中国人民解放军国防科学技术大学 | Automatic generation method and device of complex interference |
| CN110113275A (en) * | 2019-05-13 | 2019-08-09 | 北京中科飞鸿科技有限公司 | A kind of intelligence multichannel wideband interferer signal generation device |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10224811B2 (en) * | 2017-02-01 | 2019-03-05 | Texas Instruments Incorporated | Methods and apparatus to reduce electromagnetic interference in a power converter using phase hopping in conjunction with pulse width modulation |
| US10231134B1 (en) * | 2017-09-29 | 2019-03-12 | At&T Intellectual Property I, L.P. | Network planning based on crowd-sourced access point data for 5G or other next generation network |
-
2020
- 2020-08-31 CN CN202010894481.0A patent/CN111970219B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102916752A (en) * | 2012-05-07 | 2013-02-06 | 中国人民解放军国防科学技术大学 | Automatic generation method and device of complex interference |
| CN110113275A (en) * | 2019-05-13 | 2019-08-09 | 北京中科飞鸿科技有限公司 | A kind of intelligence multichannel wideband interferer signal generation device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN111970219A (en) | 2020-11-20 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US11394594B2 (en) | Method and apparatus for high data rate long range acoustic and RF communication using chirp waveform modulation | |
| Petrova et al. | Multi-class classification of analog and digital signals in cognitive radios using support vector machines | |
| CN111814777B (en) | Modulation pattern recognition method based on characteristic quantity grading | |
| Benedetto et al. | Automatic blind modulation recognition of analog and digital signals in cognitive radios | |
| CN110166389B (en) | Modulation identification method based on least square support vector machine | |
| CN111970219B (en) | Method for generating single carrier digital modulation interference signal and interference case base | |
| Zhang et al. | Hide and seek: Waveform emulation attack and defense in cross-technology communication | |
| Wang et al. | M-FSK signal recognition in fading channels for cognitive radio | |
| CN104883328A (en) | Self-adaptive shortwave frequency hopping system channel estimation method | |
| Zhao et al. | A novel automatic modulation classification method based on Stockwell-transform and energy entropy for underwater acoustic signals | |
| Suhotskiy et al. | Digital SDR-based Modem Using Optimal Multi-Frequency Signals | |
| Kalhoro et al. | Matched filter based spectrum sensing technique for 4G cellular network | |
| Salam et al. | A unified practical approach to modulation classification in cognitive radio using likelihood-based techniques | |
| Huang et al. | Design and performance analysis of multicarrier M-ary differential chaos shift keying system | |
| Zhang et al. | Cyclostationarity approach for the recognition of cyclically prefixed single carrier signals in cognitive radio | |
| Wang et al. | Modulation recognition of composite signal based on ResNet and frequency domain graph | |
| CN113067791B (en) | Information modulation and demodulation method based on phase and orthogonal signal combination | |
| Li et al. | Modulation recognition of PSK and QAM signals based on envelope spectrum analysis | |
| CN112636781B (en) | Method for detecting digital modulation optimal interference signal | |
| Kim et al. | Inter-subcarrier interference compensation in the frequency-hopped single-carrier frequency division multiple access communication system | |
| US11770284B1 (en) | Per carrier scaling of a cancellation pulse of a multi-carrier signal | |
| Azim et al. | Modulation classification based on modified Kolmogorov-Smirnov test | |
| Pan et al. | Image communication system based on chaotic FH-OFDM technique | |
| Chen et al. | Blind equalization and automatic modulation classification based on subspace for subcarrier MPSK optical communications | |
| Chao et al. | A Frequency-Hopping Communication System Based On Multiple Parallel Hopping |
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 |