The method of discrete information transmission in a radio link with a pseudorandom operating frequency tuning

 

The invention relates to the field of radio communications and computer engineering and can be used to transmit information in the computer network by radio. Technical result achieved is an effective use of the allocated frequency resource and improving the noise immunity of communication. The method of discrete information transmission in a radio link with pseudorandom change the operating frequency includes on the transmitting end of the radio link is to divide the input signal into blocks, forming a packet by encoding blocks, the restructuring of the carrier frequency of the transmitter in accordance with the codes pseudo-random sequence of binary numbers, the modulation of the carrier frequencies of the transmitter various shaped packages and the subsequent emission of a signal, the signal at the receiving end of the radio link simultaneously at all frequencies, the choice in accordance with the codes of two or more pseudo-random sequences of binary numbers of those frequency channels used in transmission and perform the conversion signal on two or more channels, the number of which is equal to the number of simultaneously radiated carrier frequency of the transmitter. 2 C.p. f-crystals, 2 Il.

The invention of atinformation in the computer network by radio with pseudorandom change the operating frequency.

Known methods of discrete information transmission in a radio link with pseudorandom change the operating frequency (see, for example, [1] pages 19-35, [2] pages 51-57, application for invention No. 99123808/09 from 10.11.1999 [3]).

In the known methods the transmission of discrete information performed by the spread spectrum signals by a pseudo-random adjustment of the operating frequency.

The closest to the technical nature of the claimed method is a method described in application No. 99123808/09 from 10.11.1999, [2] pages 51-57. The method includes transmitting end of the radio division of the input signal into blocks, forming a packet by encoding blocks that provide error correction, realignment of the carrier frequency of the transmitter in accordance with the codes pseudo-random sequence of binary numbers generated k-bit shift register with feedback by simultaneous parallel recording information from n different bits of the shift register, generating a pseudorandom sequence of maximal length, containing 2k-1 binary character, the modulation of the carrier frequency of the transmitter and the subsequent emission of a signal in space signal at the receiving end of the radio link simultaneously on all often ochnik numbers that frequency channel, on which the transfer was made, converting the signal to an intermediate frequency, amplification, demodulation, decoding of the packets and the signal is applied to the target device.

However, the prototype method has a drawback. Because the signal at some fixed point in time radiates at the same frequency, it is not effectively used frequency resource, including p=2nthe selected frequencies to transmit information. Because the signal at some fixed point in time radiates at the same frequency, it is opened by enemy reconnaissance. While fixing the frequency of the radiation signals opponent can reveal the structure of the pseudo-random sequence and create sighting frequency interference, thereby providing a complete suppression of radio.

Thus, the invention solves the problem of more efficient use of the allocated frequency resource and increase noise immunity (stealth and noise immunity) connection.

This is achieved by the known method of discrete information transmission in a radio link with pseudorandom change the operating frequency, which consists in the division on the transmitting end of the radio link of the input signal into blocks, forms the transmitter in accordance with the codes pseudo-random sequence of binary numbers, generated k-bit shift register with feedback by simultaneous parallel recording information from n different bits of the shift register, generating a pseudorandom sequence of maximal length, containing 2k-1 binary character, the modulation of the carrier frequency of the transmitter and the subsequent emission of a signal in space, the signal at the receiving end of the radio link simultaneously at all frequencies, the number of which is equal to the number p=2nthe choice in accordance with the code pseudo-random sequence of binary numbers in the frequency channel on which the transfer was made, converting the signal to an intermediate frequency, amplification, demodulation, decoding of the packets and the signal is applied to the target device according to the invention on the transmitting end of the radio link the restructuring of the transmitter is carried out simultaneously on two or more carrier frequencies in accordance with the codes of two or more pseudo-random sequences of binary numbers formed by simultaneous parallel recording information for each pseudo-random sequence of binary numbers with different digits of the shift register, while miss those bars work register Sdbot transmitter carry out various shaped packages and on the receiving end of the radio link shall select in accordance with the codes of two or more pseudo-random sequences of those frequency channels used in transmission and perform the conversion signal on two or more channels, the number being equal to the number of simultaneously radiated carrier frequency of the transmitter.

In the combination of features of the claimed process under a binary number refers to the number written in the form of digits of the binary number system and is represented as a sequence of zero and a unit of bits.

These distinctive features in comparison with the prototype allows to make a conclusion on the conformity of the proposed technical solution the criterion of "novelty".

In the proposed method, discrete information transmission in a radio link with pseudorandom change the operating frequency set of essential features in order provide more efficient use of frequency resources, because at the same time passed a few discrete packages of information on different carrier frequencies, which increases the data transfer speed also increases the immunity of communication because the transmitter emits such a combination is This signal with pseudorandom change the operating frequency makes it difficult to explore, as emitted by the transmitter signal is expanded by direct modulation of the carrier frequencies associated packages, and then due to the hopping carrier frequencies of the transmitter. This is the distribution of the signal energy in a large bandwidth than is provided, the structural secrecy of the emitted signals. In such conditions, even when fixing the radiated frequency of the transmitter pseudo-random sequence of binary numbers are not opened and the creation of targeted interference is eliminated, and the jammer is forced either to distribute the limited capacity of interference over the entire space of the signal, thereby creating a low power spectral density of interference, or to use the whole available power of the transmitter noise in the small space, leaving the remainder of the space signal free from interference. It is a new property set of features, leading to more efficient use of frequency resources and increase noise immunity radio system with pseudorandom change the working frequency is in active intrusion allows to make a conclusion on the conformity of the proposed technical solutions to the criterion of "sobre operating frequency tuning tested in laboratory conditions. An example of this method is given below.

If the number of frequency channels is 2nthe length of the code pseudo-random sequence of binary numbers is chosen equal to n bits. For example, for 16 frequency channels code length pseudo-random sequences of binary numbers should be 4 bits.

The formation of pseudo-random sequences of maximum length, containing 2k-1 binary digits, can be done by using a linear shift register having k bits, the feedback of which is determined by referring to the selected primitive polynomial of degree k. Finding primitive polynomials of degree k is given in [4] on pages 74-75.

The code generation of pseudo-random sequences of binary numbers of length n bits can be done by removing information from n different bits of the shift register, whose numbers may be randomly selected or determined according to an appropriate algorithm before the next session for transmitting and receiving ends of the radio link. During this initial filling of the bits of the shift registers on the sending and receiving ends of the radio link can be chosen arbitrarily, but must be the same.

Accom is the source of the signal; and

unit 2 - the first shift register;

unit 3 - the encoder;

unit 4 - the frequency synthesizer;

block 5 - modulator;

unit 6 - transmitter;

unit 7 - multichannel receiver;

unit 8 - second shift register;

unit 9 - decoders;

the block 10 to the target device,

and by the flowchart of Fig.2, where the blocks 11-16 bits 1-6 of the shift register and the block 17 is modulo two.

For ease of description of the operation of the device will assume that the shift register is 6 bits (k=6 bits), and the number of frequency channels 16, then the codes are pseudo-random sequences of binary numbers to rebuild the transmitter simultaneously on three carrier frequencies must have a length of 4 bits.

To define the structure of the shift register is chosen primitive polynomial of the sixth degree, such as

6+5+1.

For the selected primitive polynomial structural diagram of the shift register with feedback will be of the form shown in Fig.2. Generated by the random number generator is a binary number of length 6 bits

<6,5,4,mg>1=0,2=0,3=0,4=1,5=1,6=1 is used for the initial filling of the discharge shift registers on the sending and receiving ends of the radio link. Binary characters with 5 or 6 digits of the shift register receives at each stage to the input of the adder 17 modulo two, and from the output of the modulo two sign=56is fed to the input of the first digit of the shift register (block 11). The status bits for each measure in the process of the shift register is determined by the expression

i=i-1for

If the information is to be taken with a sixth category6then a pseudo-random sequence of binary digits maximum period will be of the form

Note that the period of this sequence is any non-zero set of six digits 0 and 1 occurs only once.

If the binary number will be removed from 1,2,3,4> will match the number x=1+22+223+234the sequence of binary numbers in the process of the register can be viewed as a sequence of numbers x(0, 1, 2, ..., 15}

If the binary number will be removed simultaneously with 1, 2, 5, 6 bits of the shift register (blocks 11, 12, 15, 16) and on each step of his work with a set of <6,5,2,1> will match the number in the form y=6+25+222+231the sequence of binary numbers in the process of the shift register can be viewed as a sequence of numbers y{0, 1, 2, ..., 15}

If the binary number will be taken along with 4, 3, 1, 6 bits of the shift register (blocks 14, 13, 11, 16) and on each step of his work with img.russianpatents.com/chr/955.gif">6> will match the number in the form z=4+23+221+236the sequence of binary numbers in the process of the shift register can be viewed as a sequence of numbers z{0, 1, 2, ..., 15}

Analysis of the generated sequences x, y, z indicates the interval corresponding to a period equal to 63 cycles of operation of the shift register, each of the numbers {1, 2,... 15} occurs exactly four times. Zero sequence occurs exactly three times, and the sequence x, y, and z cannot be obtained from one another in a cyclical shift. In the sequences x, y and z there are no hidden periodicity and provides statistical regularity used numbers.

If in the same stage of the shift register binary numbers of any pseudo-random sequences are the same, then such cycles of operation of the shift register is passed and not used in the control process of the frequency of the transmitter and the receiver.

For this example implementation, the devices 8, 18, 19, 40, 57, 59 and the 61st cycles raah provide a more efficient use of the frequency resource, increase structural secrecy of the radiated signals and noise immunity due.

Because when the shift register is passed the bars of his work, for which the generated codes are pseudo-random sequences coincide, provided the statistical uniformity of the used frequency channels in the transmission of information and excludes the application of statistical methods in cryptanalysis to break the pseudorandom sequence.

Examined the effects can be enhanced for the case when before the next session change the initial population shift registers on the sending and receiving ends of the radio link or change the bits of the shift registers used for code generation of pseudo-random sequences of binary numbers.

Implementation of the proposed method is straightforward, since all the blocks and units included in the device that implements the method, well-known and widely described in the technical literature.

Sources of information

1. C. I. Borisov, V. M. Zinchuk, A. E. Lirnarev, N. P. Mukhin, V. I. Shestopalov. The immunity of radio communication systems with expansion of the range of signals, the method of pseudo-random adjustment of the operating frequency, Radio and the>/p>3. The method of discrete information transmission in a radio link with pseudorandom change the operating frequency and the device for its implementation. Application for invention No. 99123808/09, IPC 7 H 04 1/713 from 10.11.1999.

4. B. N. Voronkov, V. I., Tupot. Methodological guide for the development of information security in computer networks, Voronezh, Voronezh State University, 2000.

Claims

1. The method of discrete information transmission in a radio link with pseudorandom change the operating frequency, comprising at the transmitting end of the radio division of the input signal into blocks, forming a packet by encoding blocks that provide error correction, realignment of the carrier frequency of the transmitter in accordance with the codes pseudo-random sequence of binary numbers generated k-bit shift register with feedback, by simultaneous parallel recording information from n different bits of the shift register, generating a pseudorandom sequence of maximal length, containing 2k-1 binary character, the modulation of the carrier frequency of the transmitter and the subsequent emission of a signal in space signal at the receiving end Radiolinja sequence of binary numbers that frequency channel, on which the transfer was made, converting the signal to an intermediate frequency, amplification, demodulation, decoding of the packets and the signal is applied to the target device, characterized in that at the transmitting end of the radio realignment of the transmitter is carried out simultaneously on two or more carrier frequencies in accordance with the codes of two or more pseudo-random sequences of binary numbers formed by simultaneous parallel recording information for each pseudo-random sequence of binary numbers with different digits of the shift register, while miss those cycles of operation of the shift register, for which binary numbers of any two pseudo-random sequences are the same, the modulation of the carrier frequencies of the transmitter perform various shaped packages and on the receiving end of the radio link shall select in accordance with the codes of two or more pseudo-random sequences of binary numbers of those frequency channels used in transmission and perform the conversion signal on two or more channels, the number being equal to the number of simultaneously radiated carrier frequency of the transmitter.

2. The method according to p. 1, characterized in that the change is inih sequences of binary numbers.

3. The method according to p. 1, wherein the change before the next session start filling bits shift registers.

 

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