RU2510930C1 - Method of transmitting information signals and apparatus for realising said method - Google Patents

Abstract

FIELD: radio engineering, communication.

SUBSTANCE: information 1 consisting of five pulses is encoded in form of a series of one positive pulse, two positive pulses, each magnified N times, one negative pulse magnified N times and one positive pulse, and an information 0 consisting of five pulses is encoded in form of a series of one negative pulse, two negative pulses, each magnified N times, one positive pulse magnified N times and one negative pulse, wherein N is a positive number greater than 1; the obtained sequences are transmitted to a data transmitting medium, and the received signal is compared with a reference signal by cross-correlation at the receiving side.

EFFECT: obtaining a clear signal with high level of interference and longer range of signal transmission.

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Description

The invention relates to methods for encoding, decoding and code conversion for error detection and correction, namely, to improve noise immunity.

A known method of encoding using Barker sequences (Theory of electrical communication. A textbook for higher education institutions under the editorship of prof. D.D. Klovsky. - M .: Radio and communications, 1998. - S.362-365), including the encoding of an information unit and zero of the three- and five-element sequence with the subsequent transfer of these sequences to the data transmission medium. The received signals are compared with the reference intercorrelation path, the signal acceptance is made from the intercorrelation function, the received signal is evaluated based on the ratio of the main peak and side lobes in the cross correlation function.

The disadvantage of this method is the inability to obtain the level of the main peak is greater than the number of elements in the sequence.

Known agreed filter (Theory of electrical communication. A textbook for higher education institutions under the editorship of Prof. D. D. Klovsky. - M .: Radio and communications, 1998. - S.362-365), which includes a delay line, phase-saving and phase-inverting cascades, summing device.

The disadvantage of this device is the inability to detect an information signal with a high level of interference.

There is a method of encoding using a pulse sequence (RU 2460211, IPC Н03М 13/00, IPC G06F 17/15. The method of transmitting information signals and a device for its implementation. - Publish. 08.21.2012. Bull. 24), including encoding an information unit and zero five-element sequence with subsequent transfer of these sequences to the data transmission medium. The received signals are compared with the reference intercorrelation path, the signal acceptance is made from the intercorrelation function, the received signal is evaluated based on the ratio of the main peak and side lobes in the cross correlation function.

The disadvantage of this method is that the signal can be transmitted over a limited distance.

The aim of the invention is to obtain a clear signal with a high level of interference and increase the transmission range of the signal.

This goal is achieved by the fact that pulses with an energy level increased by a factor of N are introduced into the Barker sequence.

The invention according to claim 1 is that the coding of an information unit of five pulses is performed in the form of a sequence of one positive, of two positive, increased N times each, one negative, increased N times, and one positive impulses, and the coding of information zero of five pulses is produced as a sequence of one negative, of two negative pulses, increased N times each, one positive pulse, increased N times, and one negative pulse, m N is a positive number greater than one, the sequences thus obtained are transmitted to the data transmission medium, and on the receiving side, the received signal is compared with the standard way of their mutual correlation, and the essence of the invention according to claim 2 is that three amplifiers are introduced on the transmitting side , the input of the first I is connected to the cascade forming the second pulse of the five-pulse signal, the output is to the adder, the input of the second II is connected to the cascade forming the third pulse of the five-pulse signal a, the output is to the summing device, the input of the third III is connected to the cascade forming the third pulse of the five-pulse signal, the output is to the summing device, and the first and fifth stages of the five-pulse signal are connected directly by the outputs to the summing device connected via the data medium to the receiving side, amplifiers four IV, five V and six VI are introduced on the receiving side, and the fourth IV input is connected to the cascade forming the second pulse of the five-pulse signal, the output to the summing device, input q of the fifth V is connected to the cascade forming the third pulse of the five-pulse signal, the output to the summing device, the input of the sixth VI is connected to the cascade forming the fourth pulse of the five-pulse signal, the output to the summing device, and the first and fifth stages of the five-pulse signal are connected directly to the summing device device forming the output signal.

Figure 1 shows the information unit in the form of the proposed five-element sequence, consisting of two 1 and 5 positive impulses, two 2 and 3 positive impulses increased N times each, and one 4 negative impulses increased N times, and in Fig. 2 shows the inter-correlation function of this sequence in the form of the main peak 6 and side lobes.

Figure 3 shows the information zero in the form of the proposed five-element sequence, consisting of two 1 and 5 negative impulses, two 2 and 3 negative impulses increased N times each, and one 4 positive impulses increased N times, and in FIG. 4 shows the inter-correlation function of this sequence in the form of the main peak 6 and side lobes.

Figure 5 presents a diagram of a device for implementing a method of transmitting information signals, including a transmitting side 7 and a receiving side 8, consisting of delay lines, respectively, 9 and 10 with phase-saving and phase-inverting cascades 11, 12, 13, 14, 15 on the transmitting side and 16, 17, 18, 19, 20 at the reception, while in the transmitting part, amplifiers 21, 22 and 23 are connected to stages 12, 13 and 14, and in the receiving part 8, amplifiers 24 are connected to the same stages 17, 18 and 19 , 25 and 26, and the outputs of the amplifiers 21, 22, 23 are connected to the input of the summing device 27, and Exit amplifiers 24, 25 and 26 - to the input of the summing device 28.

The proposed method of transmitting information is as follows.

On the transmitting side, the information unit and zero are encoded by a five-element signal, which is a modified Barker signal, in which the second pulse 2, the third pulse 3 and the fourth pulse 4 have an energy level increased, for example, by 5 times (Figs. 1, 3) or level, increased by N times, and on the receiving side, the received signals are mutually correlated with the reference signals. According to the inter-correlation function, a conclusion is made about the presence or absence of the received information signal, which is determined by the ratio of the central peak 6 and the side lobes in the inter-correlation function (Figs. 2, 4).

When the proposed sequence of pulses is mutually correlated, the difference between the central peak 6 and the side lobes is significant, and this difference is significantly larger than the increased energy of the transmitted information signal.

If we increase the energy of all pulses of the Barker five-element sequence, that is, the entire information signal, for example, five times, then the magnitude of the main peak will increase five times. However, energy costs for transmission also increase five times.

In the proposed sequence, an increase in the energy of three pulses by five times (Figs. 1, 3) leads to an increase in the main peak by 15.4 times (Figs. 2, 4), and the energy consumption for transmission increases only by 3.4 times. Since the five-element Barker sequence gives the main peak 5, and the proposed sequence gives the main peak 77, the increase in the main peak is 15.4 times, while the energy cost for transmitting the five-element Barker sequence is 5 units, and the energy cost for transmitting the proposed five-element sequence is 17 units, that is, energy costs increase 3.4 times.

In the proposed sequence, the ratio of the main peak to the energy consumption for transmitting a sequence of pulses is greater, the greater the number N.

When using the proposed sequence, the signal-to-noise ratio in the data transmission medium ceases to matter on the receiving side, which is oriented to a strictly defined waveform and its parameters, since the interference, being a random variable, cannot have the parameters of the transmitted signal even for a duration of one elementary parcels.

The proposed device operates as follows.

On the transmitting side 7, the input signal enters the delay line 9, from which it enters the phase-saving and phase-inverting stages, where a signal is generated with pulses of the necessary positive and negative polarity. The pulses from the outputs 12, 13 and 14 are fed to the amplifiers 21, 22 and 23, then these pulses, as well as the pulses from the outputs 11, 15, are summed in the adder 27 and sent to the data transmission medium. On the receiving side 8, the pulses arrive at the delay line 10, and the pulses from the outputs 17, 18 and 19 are fed to the amplifiers 24, 25 and 26. The pulses from the outputs of the delay lines 16, 20 and amplifiers 24, 25 and 26 are received in the adder 28, forming an output signal.

Thus, the proposed method and device for transmitting information signals allows to obtain a significantly higher main peak of the inter-correlation function with an increase in the energy of three pulses out of five, and not all five pulses. A higher main peak of the inter-correlation function of the received signal makes it easier to identify it among the interference and transmit the signal to a greater distance.

Claims (2)

1. A method of transmitting information signals, including encoding an information unit of five pulses in the form of a sequence of one positive, N times increased one positive, one positive, one negative and one positive impulses, encoding information zero of five pulses in the form of a sequence of one negative increased by N times one negative, one negative, one positive and one negative impulses, transmission received after The data are transmitted to the transmission medium, and on the receiving side, the received signal is compared with the reference one by means of their mutual correlation, characterized in that the coding of an information unit of five pulses is performed as a sequence of one positive, of two positive, increased by N times each, one negative , increased by N times, and one positive impulse, and coding of information zero from five impulses is carried out in the form of a sequence of one negative, of two negative Native, increased by N times each, one positive, increased by N times, and one negative impulses, where N is a positive number greater than one, the sequences thus obtained are transmitted to the data medium, and on the receiving side, the received signal is compared with the reference by their mutual correlation. 2. A device for transmitting information signals, including the transmitting and receiving sides, delay lines, phase-inverse and phase-saving cascades, one amplifier on the transmitting and receiving side, summing devices, data transmission medium, characterized in that three amplifiers are introduced on the transmitting side, input the first I is connected to the cascade forming the second pulse of the five-pulse signal, the output is to the summing device, the input of the second II is connected to the cascade forming the third pulse of the five-pulse signal, output - to the summing device, the input of the third III is connected to the cascade forming the third pulse of the five-pulse signal, the output is to the summing device, and the first and fifth stages of the five-pulse signal are connected directly by the outputs to the summing device connected via the transmission medium to the receiving side on the receiving side four IV, five V, and six VI amplifiers are introduced, and the fourth IV input is connected to the cascade forming the second pulse of the five-pulse signal, the output to the summing device, the fifth input V is connected to the cascade forming the third pulse of the five-pulse signal, the output to the summing device, the input of the sixth VI is connected to the cascade forming the fourth pulse of the five-pulse signal, the output to the summing device, and the first and fifth stages of the five-pulse signal are connected directly to the summing device, shaping the output signal.

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