CN110213009B - Safe communication method based on power mixing - Google Patents
Safe communication method based on power mixing Download PDFInfo
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- CN110213009B CN110213009B CN201910664396.2A CN201910664396A CN110213009B CN 110213009 B CN110213009 B CN 110213009B CN 201910664396 A CN201910664396 A CN 201910664396A CN 110213009 B CN110213009 B CN 110213009B
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Abstract
The invention provides a safe communication method based on power mixing, which relates to the technical field of satellite communication, and is characterized in that military information to be encrypted and other auxiliary information are mixed according to different powers for transmission, and in the process, if a non-receiving party wants to obtain the information to be encrypted, the information to be encrypted can be obtained only on the premise of obtaining other information serving as the auxiliary information; in addition, the auxiliary information is selected from signals in common civil communication and reaches the satellite through other transmission paths, so that the effective utilization of the information is realized, and the safety in the communication process is improved.
Description
Technical Field
The invention relates to the technical field of satellite communication, in particular to a safe communication method based on power mixing.
Background
With the rapid development of communication countermeasure technology, the concealment of information in military communication has become a non-negligible problem. The future battlefield is a digital battlefield, the information control right becomes a new high point for competition between the two parties of warfare after the sea control right and the air control right, the communication is an important component of the information control right, and the digital battlefield faces severe reconnaissance and stealing and electronic interference environments. Whether the communication system and the communication network have good anti-interception capability or not is a first condition for obtaining communication electronic victory or not.
Satellite communication has the advantages of wide coverage, large capacity, high transmission rate and the like, can be used in various complex communication environments, and is widely applied to military communication. However, due to the openness of the satellite channel, communication information is easy to leak, and communication concealment is poor. With the continuous development and upgrading of information war, the research on electronic reconnaissance and anti-reconnaissance, and secret stealing and anti-secret stealing technologies is receiving much attention, so how to enhance the concealment performance of satellite communication and further improve the confidentiality of communication gradually becomes a hot point of research of various countries. The wide area communication characteristic of military satellite communication brings the advantage of long communication distance, and simultaneously, satellite communication signals are easier to be received and deciphered by an interception party.
Spread spectrum technology is the mainstream technology of military anti-interference communication at present. Direct Sequence Spread Spectrum (DSSS) modulates information data to be transmitted by a high-rate spread spectrum code to realize spectrum spreading, and related despreading is carried out by the same spread spectrum code at a receiving end to recover original data. However, with the rapid development of spectrum detection technology and the reasons of the primitive polynomial disclosure of many spreading code sequences, the traditional spread spectrum communication becomes no longer secure, and the spreading sequences have the possibility of being decoded, so the research of a new covert communication system has become very important to ensure the security of military communication.
Disclosure of Invention
The embodiment of the invention aims to solve the problem that a spread spectrum sequence is easy to detect and crack in the traditional spread spectrum communication technology, and provides a safe communication method based on power mixing, which can alleviate the problem.
To alleviate the above-mentioned problems; the technical scheme adopted by the embodiment of the invention is as follows:
the invention provides a safe communication method based on power mixing, which comprises the following steps:
s1, assuming Z ═ { Z ═ Z1,z2,...,znZ is a symbol sequence, n is the number of symbols in the sequence, x1＝z2k+1For symbols to be encrypted, x2＝z2k+2A symbol selected from signals in civil communication is used as an auxiliary signal, and k is 0,1, 2; the structural expression of the transmission signal is as in equation (1)
Wherein, y1Is a symbol, y, sent from the base station to user 12Is a symbol transmitted from the base station to user 2, user 1 representing military equipment, user 2 representing civilian equipment, y1The two symbols of (2) are allocated different powers x1Is set to a, x2Is set to b, a, b are time-varying values, and a + b is 1, a>0,b>0；
S2, adopting BPSK modulation mode to modulate x1And x2，y2Passing frequency f2To user 2, y1Pass frequencyRate f1Y sent to user 1 and sent to user 11Higher than y sent to user 22Secret class of f2≠f1；
S3, the receiving end of user 2 is divided into two paths, one path receives y2And demodulates, the demodulated signal is used by user 2, the other path is y2As a key signal to user 1, let user 1 receive a signal from user 2 as y2'；
S4, receiving end y of user 12' and demodulate and then reconstruct x from the amplitude estimates2To y for1Interference cancellation is performed followed by demodulation of x1And (4) finishing.
The technical effect of the technical scheme is as follows: on one hand, military information to be encrypted and other auxiliary information are mixed according to different powers for transmission, and in the process, if a non-receiving party wants to obtain the information to be encrypted, the information to be encrypted can be obtained only on the premise that other information serving as the auxiliary information is obtained; on the other hand, the auxiliary information is selected from signals in common civil communication and reaches the satellite through other transmission paths, so that the effective utilization of the information is realized, and the safety in the communication process is improved.
As an alternative to this patent, x in step S11And x2Is determined by the values of the carrier amplitude a and b, and only if x1＝x2When y is1Instantaneous power of and y2Are equal.
The technical effect of the technical scheme is as follows: the requirement that a + b is 1, a is greater than 0, b is greater than 0, and because the values of a and b change along with time, the carrier amplitude values a and b have various combination modes, thereby greatly increasing the difficulty of a non-receiving party in obtaining the information to be encrypted.
As a technical solution selected by this patent, in step S3, y received by user 22Has two practical meanings, one is that the demodulated signal is needed by the user 2, and the other is used as a key signal y2', to user 1.
The technical effect of the technical scheme is as follows: in the traditional encryption transmission mode, an information sequence without practical significance is additionally generated to serve as key information and then transmitted to the user 1 through the civil equipment, the civil equipment in the space is occupied, resource waste is caused, auxiliary information in the technical method is selected from common civil signals, and information resources are saved.
As one solution selected in this patent, in step S4, x is reconstructed2Is of the formula
r＝x2*b*α (2)
Wherein r is a symbol for interference cancellation, and α is y1The fading coefficient through the channel.
The technical effect of the technical scheme is as follows: y is1Is sent directly from the ground station to the user 1, y2The ground station is transmitted to the user 1 through the user 2, and the two stations experience different transmission paths, so the signal fading degree is different, and the y is required to be matched1Is estimated to make the reconstructed r more accurate.
As a technical solution selected by this patent, a method for calculating the fading coefficient α is:
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
FIG. 1 is a schematic illustration of a power mixing based secure communication method of the present invention;
fig. 2 is a schematic diagram of signal parameter allocation in the power mixing-based secure communication method according to the present invention;
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Examples
Referring to fig. 1 and fig. 2, a secure communication method based on power mixing according to an embodiment of the present invention includes the following steps:
step one, assuming that Z ═ Z1,z2,...,znZ is a symbol sequence, n is the number of symbols in the sequence, x1＝z2k+1For symbols to be encrypted, x2＝z2k+2A symbol selected from signals in civil communication is used as an auxiliary signal, and k is 0,1, 2; the structural expression of the transmission signal is as in equation (1)
Wherein, y1Is a symbol, y, sent from the base station to user 12Is a symbol transmitted from the base station to user 2, user 1 representing military equipment, user 2 representing civilian equipment, y1The two paths of symbols are distributed with different powers, and the signal power is determined by the amplitude of the carrier waveImplementation, total power limited, x1Is set to a, x2Is set to b, a, b are time-varying values, see fig. 2, and a + b is 1, a>0,b>0。
Step two, adopting BPSK modulation mode to modulate x1And x2，y2Passing frequency f2To user 2, y1Passing frequency f1Sent to user 1 and user 1 has a higher security level than user 2, f2≠f1；
Step three, the receiving end of the user 2 is divided into two paths, and one path receives y2And demodulates, the demodulated information is used by user 2, and the other path is used for y2Forwarding to user 1, and setting y as the signal received by user 1 from user 22'；
I.e. y received by user 22Has two practical meanings, one is that the demodulated signal is needed by the user 2, and the other is used as a key signal y2', to user 1.
Step four, receiving y by user 1 receiving terminal2' and demodulate and then reconstruct the signal x by amplitude estimation2To y for1Interference cancellation is performed followed by demodulation of x1Then the method is finished;
reconstruction of a signal x2Is of the formula
r＝x2*b*α (2)
Where r is the sign of the interference cancellation and α is the signal y1A fading coefficient through the channel;
the method for calculating the fading coefficient alpha comprises the following steps:
The invention relates to a safe communication method based on power mixing, which has the following principle: the base station encrypts the symbol x to be encrypted1And an auxiliary symbol x2Mixing the signals according to different powers and transmitting the mixture to a user 1, wherein in the transmission process, if a non-receiving party wants to break the symbol x to be encrypted1Only at the time of learning assistanceSymbol x2Can be carried out on the premise of the following steps; in addition, an auxiliary symbol x2The method selects signals in common civil communication and transmits the signals to a satellite through civil equipment, so that the information is effectively utilized, and the safety in the communication process is improved.
FIG. 2 is a schematic diagram of signal parameter assignment according to the present invention, in which a lightly filled portion represents the symbol x2The deep-filled part represents the symbol x1。y2By carrier wave f2Is sent out, y1By carrier wave f1And sending out. t is t0At the moment, x2Is set to 1, y2＝x2. Another signal y1In (1), x2Is set to b, x1Is set to a, y1＝ax1+bx2；t1At the moment, x2Is set to 1, y2＝x2. Another signal y1In (1), x2Is set to b', x1Is set to a', y1＝a'x1+b'x2. Considering that the sign has positive and negative values, y is obtained after power mixing1And y2The total power is less than or equal to 1.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (3)
1. A method for secure communication based on power mixing, comprising the steps of:
s1, symbol sequence Z ═ Z1，z2，...，znN is the number of symbols in the sequence, x1＝z2k+1For symbols to be encrypted, x2＝z2k+2The symbol selected from the signal in civil communication is used as an auxiliary signal, and k is a natural number; the structural expression of the transmission signal is as follows(1) Comprises the following steps:
wherein, y1Is a symbol, y, sent from the base station to user 12Is a symbol transmitted from the base station to user 2, user 1 representing military equipment, user 2 representing civilian equipment, y1The two symbols of (2) are allocated different powers x1Is set to alpha, x2Is set to b, a, b are time-varying values, and a + b is 1, a >0, b > 0;
s2, adopting BPSK modulation mode to modulate x1And x2，y2Passing frequency f2To user 2, y1Passing frequency f1Y sent to user 1 and sent to user 11Higher than y sent to user 22Secret class of f2≠f1；
S3, the receiving end of user 2 is divided into two paths, one path receives y2And demodulates, the demodulated signal is used by user 2, the other path is y2Forwarded to user 1 as a key signal, user 1 receives a signal y from user 22′；
S4, receiving end y of user 12' and demodulate and then reconstruct x from the amplitude estimates2To y for1Interference cancellation is performed followed by demodulation of x1Then the method is finished;
in step S4, x is reconstructed2Is of the formula
r＝x2*b*α
Wherein r is a symbol for interference cancellation, and α is y1A fading coefficient through the channel;
the method for calculating the fading coefficient alpha comprises the following steps:
user 1 receiving end receives y1And demodulate, to y1The N symbols are sorted from large to small according to absolute values, and the values of the first N/2 symbols are selected to be averaged to obtain alpha.
2. The power-mixing-based secure communication method according to claim 1, wherein x in step S11And x2Is determined by the values of the carrier amplitude a and b, and only if x1＝x2When y is1Instantaneous power of and y2Are equal.
3. The power-mixing-based secure communication method of claim 1, wherein y received by the user 2 in step S32Has two practical meanings, one is that the demodulated signal is needed by the user 2, and the other is used as a key signal y2And sent to the user 1.
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