RU2579951C1 - Method of generating four-position quadrature phase-shift keyed signals - Google Patents

Abstract

FIELD: radio engineering and communications.

SUBSTANCE: invention can be used in communication systems. Method for forming quadrature signals from the four-manipulation is characterized in that the form of the carrier signal inphase and quadrature oscillation (SO and QO) shifted by 90° one relative to the other, manipulate each oscillation 180° the sequence of binary video signal (BVS) received from the message source, which are offset relative to each other by a half symbol duration, produce a balanced manipulation binary manipulated oscillation wave signal with a frequency equal to half the symbol rate so that the envelope signal is zero at the beginning and end of the each symbol, and then sum them, with the amplitude of the carrier wave pre manipulated by multiplying by the corresponding coefficients.

EFFECT: improving noise immunity generated signals.

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Description

The invention relates to telecommunications, and in particular to radio communication technology, and can be used in information transmission systems using signals with quadrature manipulation.

A known method of generating signals with quadrature phase modulation (CPM), called the authors of the signals of double phase telegraphy (ed. St. USSR 692109, CL H04L 27/20, 1979), which consists in splitting the carrier wave into in-phase and quadrature waves ( SC and CC), shifted one relative to the other by 90 ° in phase, shift the manipulating sequences of binary video signals (ICE) from two message sources by half the symbol duration one relative to the other, in-phase and quadrature are manipulated phase oscillations through 180 ° by the manipulating sequences of the internal combustion engine, balance modulation of the in-phase and quadrature binary-manipulated oscillations is performed, 90 ° in-phase and quadrature harmonic signals shifted relative to each other in phase with a frequency equal to half the symbol repetition rate so that the envelopes of the resulting oscillations are equal zero at the beginning and end of each symbol, and the resulting vibrations are summarized.

The known method allows you to generate signals with CPM, the phase of which is continuous at the boundaries of the characters, and the envelope is constant. The result is a reduction in the level of out-of-band emissions during transmission of the generated signals at a high transmitter efficiency.

A disadvantage of the known method of generating signals with CPM is the high level of out-of-band emissions during transmission of the generated signals, due to the presence of gaps in the first derivative of the generated signals at the boundaries.

Closest to the claimed one is a method of generating signals with CPM (Anoshkin A.V., Anoshkin D.A. Method for generating signals with quadrature phase modulation. RF Patent No. 2205518, dated 12/11/2001), namely, that the carrier oscillation is split into SC and CC, shifted by 90 ° in phase relative to each other, shift the ICE sequences from two message sources by half the character duration one relative to the other, manipulate the SC and CC by 180 ° by ICE manipulating sequences, balance modulation of in-phase and quadrature binary-manipulated oscillations is carried out, phase-shifted in phase by 90 ° in-phase and quadrature harmonic signals with a frequency equal to half the symbol repetition rate so that the envelopes of the obtained oscillations are equal to zero at the beginning and end of each symbol, and summarize the obtained oscillations moreover, the operation of generating in-phase and quadrature harmonic signals is implemented by dividing the frequency of the SC and CC in (4k + 1) times, where k is an integer, and the shift operation is constant lev els messages from two sources manipulating ICE symbol sequences on half the length of one relative to the other is performed so that the phases of the in-phase and quadrature signals coincide with the harmonic phases respectively CK and CK at the beginning and end of each character.

The disadvantage of the prototype method is the relatively low noise immunity of the generated signal.

The aim of the proposed technical solution is to increase the noise immunity of the generated signals of four-position quadrature manipulation by increasing the minimum Euclidean distance for individual points of their signal constellations while maintaining the total average energy.

при поступлении комбинации кодовой пары (ККП) информационных ДВС, соответствующих логическим значениям 01 или 10, и путем ее умножения на коэффициент

при поступлении ККП информационных ДВС, соответствующих логическим значениям 11 или 00.In the claimed method, the goal is achieved in that SC and QC are formed from the carrier oscillation, shifted 90 ° relative to each other, each vibration is manipulated by 180 ° ICE sequences coming from the message source, and the sequences manipulating the SC and QC are shifted relative to each other each other for half the duration of the symbol, balance the manipulation of binary-manipulated oscillations by a harmonic signal with a frequency equal to half the symbol repetition rate so that the envelope Suitable oscillations were zero at the beginning and end of each symbol, and then summing them. In this case, the amplitude of the carrier oscillation is preliminarily manipulated by multiplying it by a coefficient

upon receipt of a combination of a code pair (CCP) of information ICEs corresponding to logical values 01 or 10, and by multiplying it by a coefficient

upon receipt of the CCP information ICE corresponding to the logical values of 11 or 00.

A new set of essential features, which consists in preliminary multiplying the carrier oscillation by a coefficient, the value of which is determined depending on the CCP values of the internal combustion engines, allows us to achieve the indicated technical result, which consists in increasing the noise immunity of the generated signals by increasing the minimum Euclidean distance for individual points of their signal constellations at conservation of total average energy.

The claimed technical solution is illustrated by drawings.

In FIG. 1 shows temporary diagrams explaining the essence of the procedures performed during the implementation of the proposed method for generating signals of four-position quadrature manipulation:

in FIG. 1a is a sequence of information ICEs coming from a message source;

in FIG. 1b - carrier oscillation, manipulated by multiplying its amplitude by a coefficient, the value of which is determined depending on the pair of values of the CCP information ICE;

in FIG. 1c is a sequence of odd ICE CCP sequences entering the SC manipulation channel;

in FIG. 1g - manipulated SC;

in FIG. 1e is a sequence of even ICE sequences of CCP arriving at a CC manipulation channel (shifted relative to a sequence of ICE manipulating SC by half the character duration);

in FIG. 1e - manipulated QC;

in FIG. 1g - manipulated SC after balanced manipulation of a harmonic signal with a frequency equal to half the symbol repetition rate;

in FIG. 1h - manipulated QC after balanced manipulation of a harmonic signal with a frequency equal to half the symbol repetition rate;

in FIG. 1i - the resulting signal of four-position quadrature manipulation.

In FIG. 2 shows the points of signal constellations: ABCD - formed according to the prototype method; EFGH - formed in accordance with the claimed method.

When implementing the proposed method for generating signals of four-position quadrature manipulation, the following operations are performed.

1. The sequence of information internal combustion engines coming from the message source (see Fig. 1a) is divided into pairs (blocks) of two information symbols and form the CCP of information internal combustion engines.

The procedure for generating blocks of information symbols from ICE sequences is known (see Dvornikov S.V., Dvornikov S.S., Pshenichnikov A.V. et al. Method for generating quadrature amplitude manipulation signals. RF patent No. 2526760 of 05/14/2013).

при поступлении ККП информационных ДВС, соответствующих логическим значениям 01 или 10, и умножают на коэффициент

при поступлении ККП информационных ДВС, соответствующих логическим значениям 11 или 00 (см. фиг. 1б).2. Manipulate the amplitude of the carrier oscillation depending on the values of the elements of the CCP information ICE coming from the message source, for which the carrier oscillation is multiplied by a coefficient

upon receipt of the CCP information ICE corresponding to logical values 01 or 10, and multiplied by a coefficient

upon receipt of the CCP information ICE corresponding to the logical values of 11 or 00 (see Fig. 1b).

The procedure for multiplying the amplitude of the carrier oscillation by various factors is known (see Dvornikov S.V., Evstigneev A.S., Migal I.S. Method for generating quadrature amplitude manipulation signals. RF patent No. 2528390, 07/30/2013).

3. SK and KK are shifted from the manipulated carrier oscillations, shifted by 90 ° relative to each other.

The procedure for generating in-phase and quadrature oscillations from a carrier wave is known (see Dvornikov S.V., Evstigneev A.S., Migal I.S. Method for generating quadrature amplitude manipulation signals. RF patent No. 2528390, 07/30/2013).

4. Each ICE symbol from the CCP is doubled and shifted one relative to the other by half the symbol duration (see Figs. 1c and 1e). Then, the odd ICE symbol from each CCP is supplied to the SC manipulation channel, and the even ICE symbol from each CCP is respectively supplied to the CC manipulation channel.

The procedures for the formation of ICE sequences manipulating SK and KK are known (see Grigoryev V.A., Grigoryev S.V. Messaging. - SPb .: VUS, 2002. S. 207-215).

5. Each SK and KK are manipulated by 180 ° shifted by one half of the character duration relative to each other by half the character length of the manipulating sequences of information ICEs formed in accordance with paragraph 4 (see Fig. 1d and Fig. 1e);

The procedure for manipulating common-mode and quadrature signals is known, see (Anoshkin A.V., Anoshkin D.A. Method for generating signals with quadrature phase modulation. RF Patent No. 2205518, dated December 11, 2001).

6. Balance modulation of binary-manipulated SC and CC by a harmonic signal is performed with a frequency equal to half the symbol repetition rate so that the envelopes of the oscillations are zero at the beginning and end of each symbol (see, respectively, Fig. 1g and Fig. 1h) ;

The balanced modulation procedure is known (see Anoshkin A.V., Anoshkin D.A. Method for generating signals with quadrature phase modulation. RF Patent No. 2205518, dated December 11, 2001).

7. Summing the manipulated SC and CC, form the resulting signal of the four-position quadrature manipulation (see Fig. 1i).

The summation procedure is known (see Anoshkin A.V., Anoshkin D.A. Method for generating signals with quadrature phase modulation. RF Patent No. 2205518, dated December 11, 2001).

Thus, in the inventive method, when it is implemented by selecting the appropriate factor for preliminary manipulation of the carrier oscillation, determined depending on the CCP of the ICE, an increase in the minimum Euclidean distance for individual points of the signal constellations of the generated signals of four-position quadrature manipulation while maintaining their total average energy, resulting in increased noise immunity.

Figure 2 shows the signal constellation (points A, B, C, D) formed according to the prototype method, and the signal constellation (points E, F, G, H) formed according to the claimed method. In figure 1, d _min is the minimum Euclidean distance. In the inventive method, the value of d _{min is} stored only for points E and G, for points F and H the value of the minimum Euclidean distance will be r _min . Moreover, the value of r _min > d _min . Therefore, the average value of the Euclidean distance of the signal formed according to the claimed method will be large, which indicates an increase in noise immunity (see Prokis J. Digital Communication. Translated from English / Ed. By D. D. Klovsky. - M .: Radio and communications. 2000.234-238 p.). The increase in the average value of the minimum Euclidean distance between the points of the signal constellation ensures the achievement of the goal of the proposed technical solution.

In this case, the average energy of the signal generated according to the claimed method E _s will be the same as that of the signal generated according to the prototype method E _p (the average energy is equal to the square of the sum of the amplitudes of the generated vectors of signal constellations) (see Prokis J. Digital Communication. Translated from English / Under the editorship of D.D. Klovsky. - M.: Radio and Communications. 2000. 234-238 p.).

подобраны так, чтобы выполнялось равенствоCoefficient Values

chosen so that equality holds

The noted indicates that when using the proposed technical solution provides increased noise immunity of the signal, i.e. A formulated technical result is achieved.

Claims (1)

A method for generating four-position quadrature manipulation signals, which consists of generating in-phase and quadrature oscillations shifted 90 ° from one another from the carrier oscillation, manipulating each oscillation 180 ° with sequences of binary video signals coming from the message source, the sequences manipulating in-phase and quadrature oscillations, shifted relative to each other by half the duration of the character, produce balanced manipulation of binary-manipulated oscillations of a harmonic signal with a frequency equal to half the symbol repetition rate so that the envelopes of the oscillations are zero at the beginning and end of each symbol, and then sum them, characterized in that the amplitude of the carrier oscillation is manipulated by multiplying it by a factor

upon receipt of a combination of a code pair of information binary video signals corresponding to logical values 01 or 10, and by multiplying it by a coefficient

upon receipt of a combination of a code pair of information binary video signals corresponding to logical values 11 or 00.

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