RU2731881C1 - Method of generating phase-shift keyed signals by successive concatenation of radio pulses - Google Patents

Abstract

FIELD: radio equipment.

SUBSTANCE: invention relates to radio engineering and can be used to increase symbol rate in frequency-restricted radio channels. For this purpose, method is proposed for generation of phase-shift keyed signals by means of serial concatenation of radio pulses, in which control pulse train is formed from digital sequence in accordance with preset speed of manipulation. Then, manipulating radio pulses are formed on the basis of the direct and inverse shape of the modified GWFB, which are supplied in accordance with the digital sequence to the key device with two inputs, at the output of which the resultant phase-shift keyed signal is obtained.

EFFECT: technical result of disclosed method is generation of manipulated signals based on Gauss waveguide of first order (GWFB), providing high symbol rate without expansion of occupied frequency band.

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Description

The invention relates to radio engineering and can be used to increase the symbol rate in frequency-limited radio channels.

In the known sources, various types of wavelet functions have been used to generate manipulated signals.

So in (Dvornikov S.V., Dvornikov S.S., Spirin AM Synthesis of manipulated signals based on wavelet functions. Information technologies. 2013. No. 12. P.52-55; and in Dvornikov S.V., Dyakonov V .V., Dvornikov SS, Zheleznyak AV Synthesis of wavelet-manipulated signals. Bulletin of Polotsk State University. Series C: Fundamental Sciences. 2013. No. 12. P. 14-17) it is proposed to use in the formation of manipulated signals in as carrying wavelets of various orders.

The disadvantage of this method is that it leads to spectrum broadening.

V (Dvornikov SV., Pogorelov A.A., Manaenko S.S., Kislitsina K.K., Zheleznyak A.V., Dvornikov S.S., Ryabenko D.S.Formation of phase-shift keyed signals in the bases of wavelet functions. Bulletin of Polotsk State University. Series C: Fundamental Sciences. 2014. No. 12. P. 12-15) it is proposed to use Gaussian wavelet of direct and inverse structure to form manipulated signals.

The disadvantage is that when the symbol rate is equal to traditional phase shift keying signals, the signals formed on its basis occupy a large frequency band.

In (Dvornikov S.V., Manaenko S.S., Dvornikov S.S., Pogorelov A.A. Synthesis of phase-shift keyed wavelet signals. Information technologies. 2015. V. 21. No. 2. S. 140-143); Dvornikov S.S., Pshenichnikov A.V. Suggestions for generating signals by the method of sequential concatenation of wavelet functions. Proceedings of educational institutions of communication. 2016.Vol. 2.No.2. S. 48-54; and (Dvornikov S.S., Rashich A.V., Bulaeva Yu.E. Phase-manipulated wavelet signals. Scientific thought. 2016. No. 1. P.56-61) it is proposed to form manipulated signals based on wavelets by their sequential concatenation. However, the signals formed in this way are similar in their properties to the signals synthesized in accordance with the approach proposed in (Dvornikov S.V., Pogorelov A.A., Manaenko S.S., Kislitsina K.K., Zheleznyak A.V. , Dvornikov SS, Ryabenko DS Formation of phase-shift keyed signals in the bases of wavelet functions. Bulletin of Polotsk State University. Series C: Fundamental sciences. 2014. No. 12. P. 12-15).

Consequently, the disadvantage of this method is that at an equal symbol rate with traditional phase-shift keying signals, signals generated on its basis occupy a large frequency band.

The closest in technical essence to the claimed invention is "A method of forming hybrid phase-shift keyed signals by sequential concatenation of radio pulses" (Patent RU No. 2702750, dated November 27, 2018, IPC H04L 27/20, publ. 10.10.2019, 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 a control pulse sequence (UIP) is formed from the digital sequence of information zeros and ones, and the durations of each of the pulses of the generated UIP are equal to each other, and correspond to a predetermined manipulation rate of a hybrid phase-shift keyed signal (HPS), then manipulating radio pulses are generated to manipulate information zeros and ones, and a harmonic oscillation for the duration of one period and a Gaussian wavelet of the first order (VGPP) are selected as radio pulses, while the amplitude value of VGPP are reduced to the level of the value of the amplitude of the harmonic oscillation, and the duration of the period of the harmonic oscillation and the duration of the VGP, defined as manipulating radio pulses, are chosen equal to the durations of the pulses of the formed UIP, form a cut lecturing 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 the first input of the KUDV is fed a radio pulse formed from a harmonic oscillation for the duration of one period, and a radio pulse formed from the VGPP 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 for manipulating the information zero, a radio pulse is used formed from a harmonic oscillation on duration of one period, then for manipulation of the information unit, a radio pulse formed from the VGPP is used, and, conversely, in the case of a change in the manipulation speed, the duration of each of the pulses of the formed UIP is changed, and, accordingly, the duration of the harmonic period th oscillations and the duration of the VGPP, defined as manipulating radio pulses, and at the output of the KUDV receive the resulting HFS, formed by sequential concatenation of radio pulses. The hybridity of the resulting signal lies in the fact that fragments of radio signals from various functional bases are used for its formation.

The disadvantage of the prototype method is that used in it Gaussian wavelets of the first order with the same in relation to radio pulses formed from harmonic oscillations, the width of the occupied frequency band, will have a longer time interval. As a result, manipulated signals generated on the basis of first-order Gaussian wavelets will have a lower symbol rate compared to signals based on radio pulses formed from a harmonic oscillation.

From [Dvornikov S.S., Pshenichnikov A.V. Suggestions for generating signals by the method of sequential concatenation of wavelet functions. Proceedings of educational institutions of communication. 2016.Vol. 2.No.2. S. 48-54;] it is known that VGPP with equal duration with radio pulses formed from harmonic oscillations occupy a wider frequency band in relation to the latter.

The object of the invention is to provide a method that expands the scope of its application, and allows you to generate keyed signals with a higher symbol rate without expanding the occupied bandwidth.

The technical result of the proposed method is to reduce the duration of the time interval of radio pulses formed from first-order Gaussian wavelets, while maintaining the frequency band occupied by them.

In the claimed method, the technical result is achieved by the fact that a UIP is formed from a digital sequence of information zeros and ones, and the durations of each of the pulses of the generated UIP are equal to each other, then manipulating radio pulses are formed to manipulate information zeros and ones, and VGP is selected as radio pulses, and the duration of the VGPP, defined as the manipulating radio pulses, is chosen equal to the pulse durations of the formed UIP, the resulting phase-shift keyed signals are formed by sequential concatenation of the manipulating radio pulses using the KUDV, for which the manipulating radio pulses are fed to the KUDV, the inputs of which are switched under the influence of the generated UIP formed on the inputs KUDV in such a way that their phases in the resulting phase-shift keyed signals are opposite to each other, in the case of a change in the manipulation speed, the duration of each of the pulses is changed pulses of the generated UIP, and, accordingly, the duration of the VGPP, defined as manipulating radio pulses, and at the output of the KUDV, the resulting phase-shift keyed signals are obtained, formed by sequential concatenation of radio pulses, while the discrete time samples are preliminarily formed as a radio pulse of the VGPP, so that 99.2% of the energy is preserved, as a result, a truncated VGP is obtained, then, by applying the Fourier transform procedure from the truncated VGP, the distribution function of the spectral components of the truncated VGP is formed, after which the spectral components that are outside the main lobe of the spectrum are zeroed in the distribution function of the spectral components of the truncated VGP, as a result, a modified distribution function of the spectral components of the truncated VSPP is obtained, then by applying the inverse Fourier transform procedure from the modified distribution function of the spectral x components of the truncated VGPP form a modified VGPP, used as a radio pulse, which is fed to the inputs of the KUDV, then the duration of the pulses formed by the UIP is reduced so that they correspond to the duration of the modified VGPP used as a radio pulse, while a radio pulse is fed to the first input of the KUDV in the form of the direct form of the modified VGPP, and on the second - in the form of the inverse form of the modified VGPP, as a result, in the generated phase-shift keyed signals, radio pulses based on the modified VGPP will be opposite to each other.

Thus, in the claimed invention, due to a set of new essential features, consisting in zeroing discrete time counts, forming the distribution function of the spectral components of the truncated VGPP, zeroing the spectral components that are outside the main lobe of the spectrum, forming a modified VGPP, reducing the duration of the pulses formed by the AID and feeding to the inputs of the KUDV radio pulses in the form of direct and inverse forms of the modified VGPP, an increase in the number of generated manipulated radio pulses occurs at a given time interval. This makes it possible to increase the symbol rate of the generated keyed signals based on VGPP, without expanding the occupied frequency band, and to obtain a technical result.

The claimed technical solution is illustrated by drawings, where:

in fig. 1 shows time diagrams explaining the sequence and essence of the procedures for generating UIP pulses from a digital sequence of information zeros and ones;

in fig. 2 shows the function of the energy distribution of the VGPP over time. Points A and B show the boundaries of the truncation of the original VGP w> j (t);

in fig. 3 shows the original VGP w ₁ (t) and a truncated VGP

Points A and £ show the cutoff boundaries of the original VGP;

усеченного ВГПП

и усеченного ВГПП с обнуленными спектральными компонентами

находящимися за пределами главного лепестка спектра, точка В

- модифицированная функция распределения спектральных составляющих усеченного ВГПП);in fig. 4 shows the distribution functions of spectral components:

truncated VSPP

and a truncated VGP with zeroed spectral components

outside the main lobe of the spectrum, point B

- modified distribution function of the spectral components of the truncated VGP);

in fig. 5 shows the original VGP w ₁ (t) and the modified VGP z (t);

in fig. 6 shows the principle of reducing the UTI pulse to the size of the modified UGP. Point D shows the border of the decrease in the duration of the initial pulse of the UIP;

in fig. 7 shows the principle of forming phase-shift keyed signals by sequential concatenation of radio pulses connected by means of the KUDV;

in fig. 8 shows fragments of phase-shift keyed signals based on VGPP and modified VGPP and their spectra.

The implementation of the proposed method for generating phase-shift keyed signals by sequential concatenation of radio pulses provides for the following operations.

1. From the digital sequence of information zeros and ones form the UIP. In this case, the duration of a single pulse message determines the transmission rate (symbol rate). In general, the sequence can be any: zero corresponds to a pulse of positive polarity, and one corresponds to negative polarity; zero corresponds to a pulse of negative polarity, and one to positive polarity. By way of example, shown: FIG. 1a information symbols; in fig. 1b information pulses of the UIP.

2. Generate manipulating radio pulses for manipulating information zeros and ones. As radio pulses, the direct form of the VGPP and the inverse form of the VGPP are selected. By way of example, shown: FIG. 1c manipulating radio pulses in the form of the direct form of the VGPP and in the form of the inverse form of the VGPP, corresponding to the information zero and one.

3. In the VGPP formed as a radio pulse, discrete time samples are zeroed so that 99.2% of the energy remains in the remaining radio pulse, as a result a truncated VGPP is obtained.

To obtain a truncated VGPP with the help of an integrator, the function of the VGPP energy distribution over time e ₀ (t) is formed.

An example of the VGPP energy distribution function over time is shown in FIG. 2.

Then, time samples are evenly truncated from the beginning and end of the VGPP (see Fig. 2, points A and B) so that 99.2% of the energy remains in the remaining VGPP energy distribution function, from its original value, thus a truncated VGPP is obtained ... Truncation of time samples can be done by applying filtering procedures or by multiplying them by zero values.

4. Then, by applying the Fourier transform procedure from the truncated VGPP, the distribution function of the spectral components of the truncated VGPP is formed (see Fig. 3 and Fig. 4).

5. After that, in the distribution function of the spectral components of the truncated VGPP, the spectral components outside the main lobe of the spectrum are zeroed, as a result, a modified distribution function of the spectral components of the truncated VGPP is obtained (see Fig. 4).

Zeroing of spectral components outside the main spectral lobe is carried out by filtering or multiplying by zero values.

6. Then, by applying the procedure of the inverse Fourier transform from the modified distribution function of the spectral components of the truncated VGPP, a modified VGPP is formed, used as a radio pulse, which is fed to the inputs of the KUDV (see Fig. 5).

7. After that, the duration of the pulses formed by the UIP is reduced so that they correspond to the duration of the modified VGP, which is used as a radio pulse.

FIG. 6a point D shows the level of reduction of the UIP pulse to the duration of the modified UGP, in Fig. 6b shows the pulse of the UIP and VGPP.

It is possible to reduce the duration of the UIP pulses by resetting the time counts.

8. At the same time, a radio pulse is fed to the first input of the KUDV in the form of a direct form of the modified VGPP, and to the second - in the form of an inverse form of the modified VGPP. As a result, in the generated phase-shift keyed signals, radio pulses based on the modified VSPP will be opposite to each other (see Fig. 7). The process of concatenation itself is implemented by means of the KUDV and consists in the sequential combination of the generated radio pulses into an integral sequence, which is the resulting phase-shift keyed signal.

By way of example, in FIG. 7 shows the principle of forming phase-shift keyed signals by sequential concatenation of radio pulses connected by means of the KUDV.

As an example of achieving the technical result of the claimed invention, FIG. 8 shows sequences of phase-shift keyed signals of equal duration and their spectra, formed on the basis of the original VSP and the modified VSP.

Thus, in the claimed method during its implementation due to the sequential concatenation of radio pulses formed on the basis of a modified VGPP having new properties, the objective of the invention is achieved and the technical result of the proposed method is provided. Namely, the formation of keyed signals based on VGP, providing a high symbol rate without expanding the occupied bandwidth.

Thus, in the claimed method, during its implementation, the formation of modified VGPPs is provided, which make it possible to reduce their time intervals in duration, while maintaining the frequency band occupied by them, and the objective of the invention is achieved, and the technical result of the proposed method is also provided. As a result, the generated on the basis of modified VGPP by sequential concatenation of keyed signals, a high symbol rate is provided without expanding the occupied bandwidth.

Claims (1)

A method for generating phase-shift keyed signals by sequential concatenation of radio pulses, which consists in the fact that a control pulse sequence is formed from a digital sequence of information zeros and ones, and the durations of each of the pulses of the generated control pulse sequence are equal to each other, then manipulating radio pulses are formed to manipulate information zeros and ones , and the first-order Gaussian wavelet is selected as radio pulses, and the duration of the first-order Gaussian wavelet, defined as the manipulating radio pulses, is chosen equal to the pulse durations of the generated control pulse sequence, the resulting phase-shift keyed signals are formed by sequential concatenation of the manipulating radio pulses using a key device with two inputs, for which the manipulating radio pulses are fed to a key device with two inputs, in whose strokes are switched under the influence of the generated control pulse sequence, the generated radio pulses are fed to the inputs of the key device with two inputs so that their phases in the resulting phase-shift keyed signals are opposite to each other, in the event of a change in the manipulation speed, the duration of each of the pulses of the generated control pulse sequence is changed and accordingly, the duration of the Gaussian wavelet of the first order, defined as manipulating radio pulses, and at the output of the key device with two inputs, the resulting phase-shift keyed signals are obtained, formed by sequential concatenation of radio pulses, characterized in that discrete time samples are zeroed in the first order Gaussian wavelet previously formed as a radio pulse so that 99.2% of the energy is retained in the remaining part, as a result, a truncated Gaussian wavelet of the first order is obtained, for Thus, by applying the Fourier transform procedure from a truncated Gaussian wavelet of the first order, the distribution function of the spectral components of the truncated Gaussian wavelet of the first order is formed, after which the spectral components outside the main lobe of the spectrum are zeroed in the distribution function of the spectral components of the truncated Gaussian wavelet of the first order, as a result, a modified the distribution function of the spectral components of the truncated Gaussian wavelet of the first order, then by applying the procedure of the inverse Fourier transform from the modified distribution function of the spectral components of the truncated Gaussian wavelet of the first order, a modified Gaussian wavelet of the first order is formed, which is used as a radio pulse, which is fed to the inputs of the key device with two inputs, after that, the duration of the pulses of the generated control pulse sequence is reduced so that they correspond to q of the modified first-order Gaussian wavelet used as a radio pulse, while the radio pulse is fed to the first input of a key device with two inputs in the form of a direct form of a modified first-order Gaussian wavelet, and to the second - in the form of an inverse form of a modified first-order Gaussian wavelet, as a result In the generated phase-shift keyed signals, radio pulses based on a modified first-order Gaussian wavelet will be opposite to each other.

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