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System for transmitting information using random signals

IPC classes for russian patent System for transmitting information using random signals (RU 2369018):

H04K1/02 - by adding a second signal to make the desired signal unintelligible

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FIELD: information technology.

SUBSTANCE: invention relates to information transmission with spectrum broadening and can be used in communication systems. The proposed information transmission system using random signals has an information source, multiplexer, delay line, random signal generator, broadband amplifier, communication channel, high-frequency amplifier, first multiplier, tapped delay line, first integrator, second and third multipliers, first generator of a copy of autocorrelation function of random signal, corresponding to information character "1", second generator of a copy of autocorrelation function of random signal, corresponding to information character "0", second integrator, third integrator, subtractor, decision device and information recipient.

EFFECT: increased noise-immunity of the system for transmitting information using random signals.

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The technical field to which the invention relates.

The invention relates to the field of information transmission with the extension of the spectrum, carried out using chaotic signals vectors and can be used to improve the noise immunity of the communication system.

The level of technology

A known communication system using chaotic signals containing driver chaotic radio or optical pulses that perform the function of the modulator broadband media, chaotic dynamic system, the communication channel (see EN 2185032, NC 1/00, H04L 9/00, NV 1/02, 2002.07.10).

However, in this communication system using chaotic signals has the disadvantage of its low noise immunity.

The closest to the technical essence of the present invention is a communication system containing the transmitting side, the communication channel, the receiving side. The transferor contains: information source, the switch, the generator of chaotic sequence, band-pass filter, delay line, cascades frequency conversion and power amplification of the output signals of the transmitter. Reception side includes: receiver input circuit (amplifiers high frequency converters, amplifiers, intermediate frequency), the decoding device containing multidrop line C the support, the first multiplier, the second multiplier, the first integrator, the second integrator, the comparison circuit and the receiver of the information (see Semenov A.M., Sigarev A.A. Broadband radio. - M.: Voenizdat, 1970. P. 203).

Its distinguishing feature is that it is the autocorrelation reception chaotic signal based on the detection values of the autocorrelation functions of the signals by the formula

where T is the duration of the signal x(t) - chaotic signal, τ is the magnitude of the time delay. To register the received chaotic signal x₁(t) or x₂(t) recognized the value of the delay τ₁in the receiver, since the value of τ₁and τ₂delays in the sending device information settings "1" and "0", i.e. τ=τ₁for chaotic signal x₁(t) and τ=τ₂for x₂(t). The decision about the received chaotic signal on a single sample (see Semenov A.M., Sigarev A.A. Broadband radio. - M.: Voenizdat, 1970. S).

Signal-to-noise h²this is defined as a scheme with a single reference by the formula

where a²- dispersion of the chaotic signal, σ²- RMS noise (see A.A. Kharkevich Combating interference. - M.: Nauka, 1965. P.61). It is established that this technique has low immunity

Disclosure of inventions

The objective of the invention is to develop a system of information transmission of chaotic signals with high noise immunity.

The technical result that can be obtained using the present invention is to increase the noise immunity of the system of information transmission of chaotic signals through the use of integrated reception. The problem is solved due to the fact that the decision signal is produced based on the analysis of the accumulated value of the autocorrelation function of the correlation window.

The technical result is achieved by the fact that in the system of information transmission of chaotic signals containing the disclosing party, including the information source, the switch, the generator of chaotic signal, the delay line, the communication channel; a receiving side, comprising a first multiplier, multi-tap delay line, the first integrator, it is additionally introduced on the transmission side of the broadband amplifier on the receiving side amplifier high frequency, second and third multipliers, the first generator copies the autocorrelation function of a chaotic signal corresponding to the information symbol "1", the second oscillator copies of the autocorrelation function of the chaotic signal corresponding to the information symbol "0", the second and third integrators, subtractive device, solver, and the output of the information source connected to the first input of the switch, the second and third inputs of the switch is connected to the first and second outputs of the delay line, the input of the delay line is connected to the generator output chaotic signal, the output switch is connected to the input of the broadband amplifier, the output of the broadband amplifier is connected to the input of the communication channel, the output channel is connected to the input of the amplifier high frequency amplifier output high-frequency connected to the first input of the first multiplier and to the input tap of the delay line m of taps tap of the delay line are connected with the corresponding m inputs of the first multiplier, the output of the first multiplier connected to the input of the first integrator, the output of the first integrator is connected to the inputs of the second and third multiplier, a second input of the second multiplier connected to the output of the first generator copies the autocorrelation function of a chaotic signal corresponding to the information symbol "1", the second input of the third multiplier connected to the output of the second generator copies the autocorrelation function of a chaotic signal corresponding to the information symbol "0", the output of the second multiplier is connected to the input of the second integrator, the output of the third multiplier connected to the input of the third Integra is ora, the output of the second integrator connected to the first input of subtractive device, the output of the third integrator is connected to a second input of subtractive device, the output of subtractive device is connected to the input of a casting device, the output of a casting device is connected to the input of the receiver.

Brief description of drawings

Figure 1 shows the structural diagram of the proposed system of information transmission of chaotic signals with high noise immunity.

Figure 2 presents diagrams explaining the principle of the proposed system of information transmission of chaotic signals.

The implementation of the invention

The proposed system of information transmission of chaotic signals with high noise immunity (figure 1) consists of: information source 1, the switch 2, the delay line 3, the chaotic signal generator 4, a broadband amplifier 5, the communication channel 6, the amplifier high frequency 7, the first multiplier 8, multi-tap delay line 9, the first integrator 10, the second multiplier 11, the third multiplier 12, the first generator copies the autocorrelation function of a chaotic signal 13 corresponding to the information symbol "1", the second generator copies the autocorrelation function of a chaotic signal 14 corresponding to the information symbol "0", the second integrator 1, the third integrator 16, subtractive device 17, a casting device 18 and the receiver 19.

The proposed system of information transmission of chaotic signals with high noise immunity operates as follows.

Message from the information source 1 is supplied to the first input of the switch 2, where each binary symbol "1" or "0" of the original message is mapped to a priori known information for each bit of the a certain chaotic implementation, with her characteristic autocorrelation functions (figure 2 a, b)entering the switch from the first and second outputs of the delay line 3, to the input of delay line 3 enters a chaotic signal generated by the chaotic signal generator 4. Then the chaotic signal sequence through a broadband amplifier 5 is supplied to the communication channel 6. At the receiving side, the received signal is amplified to the required level in the amplifier high frequency 7, and then is multiplied by the first multiplier 8 of himself, out on the value of τ in a multi-tap delay line 9, and is integrated by the first integrator 10. As a result, at the output of the integrator calculates the autocorrelation function of a received signal in accordance with the expression (1).

Suppose that at the receiving side has received chaotic signal corresponding si is the ox "1" with the autocorrelation function (figure 2 (a), received after the first integrator 10. After that, he goes to the first inputs of the second 11 and third 12 multipliers, where the arithmetic operation of multiplying the autocorrelation function of a received signal on a copy of the autocorrelation functions of the signals from the first generator copies the autocorrelation function of a chaotic signal 13 corresponding to the information symbol "1" (figure 2) and the second generator copies the autocorrelation function of a chaotic signal 14 corresponding to the information symbol "0" (figure 2 g). Next, the obtained values of the received chaotic signal is integrated in the second 15 (figure 2 d) and the third 16 (figure 2 (e) integrators and act on the first and second subtractive input device 17, the signal is then fed to a crucial device 18, where a decision is made about its character, in this case, if the differential voltage is greater than zero, then the conclusion adopted a "1"if less, about the accepted "0", then the received information is supplied to the receiver 19.

It should be emphasized that the above approach is fully consistent integral method of receiving, at which the input signal-to-noise ratio can be calculated by the formula (see A.A. Kharkevich Combating interference. -M.: Nauka, 1965. P.70):

where n=T/τ₀the number of anal is projected counts (the number of uncorrelated interference values in the interval duration signal), τ₀- interval correlation of noise with the chaotic signal.

From the analysis of the expressions (2) and (3) it follows that the developed system of information transmission of chaotic signals has a higher n times the noise immunity than the prototype (see Semenov A.M., Sigarev A.A. Broadband radio. - M.: Voenizdat, 1970. P. 203).

The system of information transmission of chaotic signals containing the disclosing party, including the information source, the switch, the generator of chaotic signal, the delay line, the communication channel; a receiving side, comprising a first multiplier, multi-tap delay line, the first integrator, it is additionally introduced on the transmission side of the broadband amplifier on the receiving side amplifier high frequency, second and third multipliers, the first generator copies the autocorrelation function of a chaotic signal corresponding to the information symbol "1", the second oscillator copies of the autocorrelation function of the chaotic signal corresponding to the information symbol "0", the second and third integrators, subtractive device, solver, and the output of the information source connected to the first input of the switch, the second and the third input of the switch is connected to the first and the second output of the delay line, the input of the delay line is connected to the generator output chaotic signal output to the of mutator connected to the input of the broadband amplifier, the output of the broadband amplifier is connected to the input of the communication channel, the output channel is connected to the input of the amplifier high frequency amplifier output high-frequency connected to the first input of the first multiplier and to the input tap of the delay line m of taps tap of the delay line are connected with the corresponding m inputs of the first multiplier, the output of the first multiplier is connected to the input of the first integrator, the output of the first integrator is connected to the inputs of the second and third multiplier, a second input of the second multiplier connected to the output of the first generator copies the autocorrelation function of a chaotic signal corresponding to the information symbol "1", the second input of the third multiplier connected to the output of the second generator copies the autocorrelation function of a chaotic signal corresponding to the information symbol "0", the output of the second multiplier is connected to the input of the second integrator, the output of the third multiplier connected to the input of the third integrator, the output of the second integrator connected to the first input of subtractive device, the output of the third integrator is connected to a second input of subtractive device, the output of subtractive device is connected to the input of a casting device, the output of a casting device is connected to the input of the receiver.