RU2749876C1 - Method for formation of interference hybrid phasomanipulated signals - Google Patents

Abstract

FIELD: radio engineering.SUBSTANCE: invention relates to the field of radio engineering and can be used in information transmission systems by means of phase-shift keyed signals. In the method for generating noise-immune hybrid phase-shift keyed signals by sequential concatenation of radio pulses, a control pulse sequence is formed from a digital sequence. Then, manipulating radio pulses are formed on the basis of harmonic oscillations and the Gaussian wavelet of the first order, in which the duration of radio pulses formed on the basis of the harmonic oscillation is reduced, so that the frequency band of the spectrum occupied by them is equal to the frequency band occupied by the spectrum of radio pulses formed on the basis of the Gaussian wavelet first order.EFFECT: increased noise immunity of the generated hybrid phase-shift keyed signal.1 cl, 7 dwg

Description

The invention relates to the field of radio engineering, and can be used in information transmission systems by means of phase-shift keyed signals (FMS).

A known method of generating signals with a constant envelope and m-ary phase shift keying (Banquet V.L., Dorofeev V.M.Digital methods in satellite communications. - M .: Radio and communication, 1988., p. 36, 37 Fig. 2.1 , but).

The method consists in the fact that with the help of a switch, two streams of even and odd binary symbols are formed from the digital information stream of symbols. Then each of these streams is subjected to digital-to-analog conversion (DAC), and then multiplication (using balanced modulators) with the corresponding quadrature components of the carrier (subcarrier) oscillation. The results of the multiplication are summed using an adder, at the output of which a phase-shift keyed signal is obtained.

The disadvantage of this method lies in the implementation of nonlinear multiplication procedures that complicate the practical implementation of devices based on it.

A known method of generating signals with a constant envelope and m-ary phase shift keying (Banquet V.L., Dorofeev V.M.Digital methods in satellite communications. - M .: Radio and communication, 1988., p. 83, Fig. 3.3) consisting in the following: the digital sequence associated with the information symbols is divided into two digital information sequences, each of the obtained sequences is subjected to a DAC in a corresponding digital-to-analog converter. One of the received signals is multiplied with the in-phase component of the carrier (subcarrier) of the waveform, and the other with the quadrature component of the carrier (subcarrier) of the waveform. By adding the results of the multiplication in the adder, the FMS is obtained at the output of the adder.

The disadvantage of this method lies in the implementation of nonlinear multiplication procedures that complicate the practical implementation of devices based on it.

The closest in technical essence to the claimed invention is "A method of forming hybrid phase-shift keyed signals (HFS) by sequential concatenation of radio pulses" (Patent, 2702750 IPC H04L 27/20, publ. 27.11.2018 Bull. No. 29).

The essence of the prototype method lies in the fact that oscillations are formed from the digital sequence of information zeros and ones, which are summed, while the control pulse sequence (UIP) is formed from the digital sequence of information zeros and ones, and the durations of each of the pulses formed by the UIP are equal to each other, and correspond to a predetermined HPS manipulation speed, then manipulating radio pulses are formed to manipulate information zeros and ones, and a harmonic oscillation for the duration of one period and a Gaussian wavelet of the first order are selected as radio pulses, while the amplitude value of the Gaussian wavelet of the first order is reduced to the level of the amplitude value harmonic oscillation, and the duration of the period of the harmonic oscillation and the duration of the Gaussian wavelet of the first order, defined as manipulating radio pulses, are chosen equal to the pulse durations of the formed UIP, form the resulting HFS by sequential concatenation of manipulating radio pulses using a key device with two inputs (KUDV), for which the manipulating radio pulses are fed to the KUDV, the inputs of which are switched under the influence of the formed UIP, while a radio pulse formed from a harmonic oscillation with a duration of one period, and a radio pulse formed from a Gaussian wavelet of the first order is fed to the second input, the generated radio pulses are fed to the inputs of the KUDV in such a way that their phases in the resulting HFS are opposite to each other, while, if the information zero is manipulated using a radio pulse formed from harmonic oscillations for the duration of one period, then for manipulation of the information unit, a radio pulse is used, formed from a Gaussian wavelet of the first order, and, conversely, in the case of a change in the manipulation speed, the duration of each of the pulses is changed. th UIP, and, accordingly, the duration of the harmonic oscillation period and the duration of the Gaussian wavelet of the first order, defined as manipulating radio pulses, and at the output of the KUDV, the resulting HFS are obtained, formed by serial concatenation of radio pulses.

However, the prototype method has a relatively low noise immunity associated with the difference in the spectral properties of the basic radio pulses. So the width of the spectrum of a radio pulse formed from a Gaussian wavelet is greater than the width of the spectrum of a radio pulse formed on the basis of a harmonic oscillation. Consequently, when receiving a hybrid signal formed on the basis of the prototype method, the filter that is optimal for receiving fragments, formed on the basis of a Gaussian wavelet, will not be optimal for receiving fragments formed on the basis of harmonic radio pulses.

The object of the invention is to provide a method that allows to reduce the duration of radio pulses formed on the basis of harmonic oscillations so that the frequency band occupied by the spectrum is equal to the frequency band occupied by the spectrum of radio pulses formed on the basis of the Gaussian wavelet of the first order.

The technical result is to increase the noise immunity of the generated hybrid signal.

The technical result is achieved by the fact that a control pulse sequence is formed from a digital sequence of information zeros and ones, then manipulating radio pulses are formed to manipulate information zeros and ones, and a harmonic vibration for the duration of one period and a Gaussian wavelet of the first order are selected as radio pulses, while the amplitude the value of the Gaussian wavelet of the first order is reduced to the level of the amplitude of the harmonic oscillation, the resulting hybrid phase-shift keyed signals are formed by sequential concatenation of manipulating radio pulses using a key device with two inputs, for which manipulating radio pulses are fed to a key device with two inputs, the inputs of which are switched under the influence of a generated control pulse sequence, while the first input of the key device with two inputs serves a radio pulse formed from a harmonic oscillation for the duration of one period, and a radio pulse formed from a Gaussian wavelet of the first order is fed to the second input, the generated radio pulses are fed to the inputs of a key device with two inputs so that their phases in the resulting hybrid phase-shift keyed signals are opposite to each other, while if for manipulation of the information zero, a radio pulse is used, formed from a harmonic oscillation for the duration of one period, then for the manipulation of an information unit, a radio pulse is used, formed from a Gaussian wavelet of the first order, and vice versa, and the duration of radio pulses formed on the basis of a harmonic oscillation is selected so that The spectrum occupied by them was equal to the frequency band occupied by the spectrum of radio pulses formed on the basis of the Gaussian wavelet of the first order.

The technical result is achieved due to the introduction of new significant actions, which makes it possible to reduce the duration of radio pulses formed on the basis of harmonic oscillations, as a result of which the frequency band occupied by their spectrum will be equal to the frequency band occupied by the radio pulse spectrum based on the Gaussian wavelet, the possibility of optimal reception of the hybrid signal.

The claimed technical solution is illustrated by drawings, where

in fig. 1 shows the general principle of the formation of hybrid signals based on radio pulses of different duration;

in fig. 2 shows the time diagrams of radio pulses used to form a HPS of equal duration; S1 (t) is a radio pulse formed from a harmonic oscillation; Z1 (t) is a radio pulse formed on the basis of a first-order Gaussian wavelet before its amplitude is equalized; Z (t) is a radio pulse generated on the basis of a first-order Gaussian wavelet after equalizing its amplitude (hereinafter referred to as a radio pulse generated on the basis of a first-order Gaussian wavelet);

и

, используемых для формирования ГФС равной длительности;

- сформированный из S1(t);

- сформированный из Z(t);in fig. 3 shows the moduli spectra of radio pulses

and

used for the formation of GFS of equal duration;

- formed from S1 (t);

- formed from Z (t);

in fig. 4 shows radio pulses of various durations: Z (t) - formed on the basis of a Gaussian wavelet of the first order, and S (t) - formed from a harmonic oscillation; the duration of S (t) is reduced in such a way as to ensure equality of the spectra of the signals Z (t) and S (t);

и

, используемых для формирования ГФС;

- сформированный из Z(t);

- сформированный из Z(t);in fig. 5 shows the modules of the spectra of radio pulses

and

used to form the SFS;

- formed from Z (t);

- formed from Z (t);

in fig. 6 shows the resulting GFS Z3 (t), formed on the basis of the prototype method;

in fig. 7 shows the resulting GFS Z4 (t), formed on the basis of the claimed invention.

The implementation of the proposed method for the formation of HFS by sequential concatenation of radio pulses provides for the following operations.

1. From the digital sequence of information zeros and ones, see FIG. 1a, a pulse sequence is generated, see FIG. 1b.

In general, the sequence can be any:

zero corresponds to a pulse of positive polarity, and one - negative;

zero corresponds to a pulse of negative polarity, and one to positive polarity, etc.

2. Form manipulating radio pulses for manipulating information zeros and ones. A harmonic oscillation for the duration of one period and a Gaussian wavelet of the first order are selected as radio pulses. In this case, the amplitude value of the Gaussian wavelet of the first order is reduced to the level of the value of the amplitude of the harmonic oscillation, see Fig. 2.

3. The duration of radio pulses formed on the basis of harmonic oscillations is selected so that the frequency band of the spectrum occupied by them is equal to the frequency band occupied by the spectrum of radio pulses formed on the basis of the Gaussian wavelet of the first order.

To do this, the duration of each radio pulse formed on the basis of the harmonic oscillation is successively reduced until the frequency band occupied by its spectrum becomes equal to the frequency band occupied by the radio pulse spectrum formed on the basis of the first-order Gaussian wavelet.

By way of example, in FIG. 2 shows the time diagrams of the basic shaping signals of the same duration: S1 (t) - formed from a harmonic oscillation; Z (t) - generated on the basis of the first order Gaussian wavelet. FIG. 3 shows the modules of the spectra of the basic shaping signals S1 (t) and Z (t). FIG. 4 shows the time diagrams of the basic shaping signals of various durations: S (t) - formed from a harmonic oscillation; Z (t) - formed on the basis of the Gaussian wavelet of the first order, the spectrum width of which is the same (see Fig. 5).

4. The required HFS is formed by sequential concatenation of manipulating radio pulses based on the KUDV, see FIG. 1d. For this, the manipulating radio pulses are fed to the KUDV, the inputs of which are switched under the influence of the formed UIP. A radio pulse formed from a harmonic oscillation S (t) for the duration of one period is fed to the first input of the KUDV, see Fig. 1d, and a radio pulse formed from the Gaussian wavelet of the first order Z (t) is fed to the second input of the KUDV, see Fig. 1c.

5. The generated radio pulses are fed to the inputs of the KUDV in such a way that their phases in the resulting HFS are opposite to each other. If a radio pulse formed from a harmonic oscillation for a duration of one period is used to manipulate the information zero, then a radio pulse formed from a Gaussian wavelet of the first order is used to manipulate the information unit, and vice versa, see Fig. one.

The implementation of these procedures provides phase differences, on the basis of which a decision on the transmitted information symbol is made at the reception.

6. The resulting GFS, formed by sequential concatenation of radio pulses, are obtained at the output of the KUDV.

The concatenation process itself is implemented through a key scheme. By way of example, in FIG. 1e shows the principle of HFS formation by sequential concatenation of radio pulses connected by means of a key.

By way of example, in FIG. 6 shows a fragment of the resulting hybrid signal Z3 (t) generated on the basis of the prototype method, and FIG. 7 fragment Z4 (t) formed on the basis of the claimed invention.

The hybridity of the resulting signal lies in the fact that fragments of radio signals from various functional bases are used for its formation. In the claimed method, the hybrid signal is formed from the basis of harmonic functions and from the basis of wavelet functions.

In the prototype method, it is proposed to generate basic radio signals of the same duration. As a result, the spectra of radio pulses formed from a harmonic vibration will occupy a much smaller frequency band than the spectra of radio pulses formed from a Gaussian wavelet of the first order, see Fig. 2 and FIG. 3.

Consequently, when organizing the reception of hybrid signals generated in accordance with the prototype method, it will be impossible to select the parameters of the input filter so that they are simultaneously matched with the width of the spectrum of radio pulses formed from the Gaussian wavelet of the first order, and with the width of the spectrum of radio pulses formed from the harmonic fluctuations. These circumstances will lead to a decrease in noise immunity.

In the claimed method, a decrease in the duration of radio pulses formed from a harmonic oscillation leads to an increase in the frequency band occupied by their spectra to the value of the frequency band occupied by the spectra of radio pulses formed from a Gaussian wavelet of the first order, see Fig. 4 and FIG. 5. As a result, the consistent reception of hybrid signals formed in this way will be possible with the same parameters of the input filter.

Claims (1)

A method of generating noise-immune hybrid phase-shift keyed signals, which consists in the fact that a control pulse sequence is formed from a digital sequence of information zeros and ones, then manipulating radio pulses are formed to manipulate information zeros and ones, and a harmonic oscillation for the duration of one period and a Gaussian wavelet are selected as radio pulses of the first order, while the amplitude value of the Gaussian wavelet of the first order is reduced to the level of the amplitude of the harmonic oscillation, the resulting hybrid phase-shift keyed signals are formed by sequential concatenation of manipulating radio pulses using a key device with two inputs, for which manipulating radio pulses are fed to a key device with two inputs, inputs which is switched under the influence of the generated control pulse sequence, while at the first input of the key device with two inputs and a radio pulse formed from a harmonic oscillation for the duration of one period is fed, and a radio pulse formed from a Gaussian wavelet of the first order is fed to the second input, the generated radio pulses are fed to the inputs of a key device with two inputs so that their phases in the resulting hybrid phase-shift keyed signals are are opposite to each other, while if for manipulating the information zero a radio pulse is used, formed from a harmonic oscillation for the duration of one period, then for manipulating the information unit, a radio pulse is used formed from a Gaussian wavelet of the first order, and vice versa, characterized in that the duration of radio pulses formed on the basis of harmonic oscillations are selected in such a way that the frequency band of the spectrum they occupy is equal to the frequency band occupied by the spectrum of radio pulses formed on the basis of the Gaussian wavelet of the first order.

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