RU2619766C1 - Method of data transmission - Google Patents

Abstract

FIELD: radio engineering, communication.

SUBSTANCE: data transmission method is based on the fact that an N-bit message is generated by the transmitting subscriber unit, where N is an integer greater than or equal to one, each of the N bits is converted into a predetermined signal, the received signals are transmitted to the signal propagation environment, the transmitted signals are received, and N-bit message is generated by the receiving subscriber unit. To achieve the technical result of increasing the data transmission rate, orthogonal ultrabroadband chaotic signals are used as the transmitted signals, forming a packet of information signals and a clock signal in a special way. The method may be implemented by a communication system consisting of a transmitting part, comprising a transmitting subscriber unit (1), an encoder (2), a transmitting apparatus (3), a read only memory (ROM) of the transmitting part (4), a synchronizer of the transmitting part (5), a radiating antenna (6), and a receiving part, comprising a receiving antenna (7), a receiving apparatus (8), a decoding device (9), a receiving subscriber unit (10), a ROM of receiving part (11), a synchronizer of the receiving part (12).

EFFECT: high data transmission speed.

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Description

The invention relates to communication technology, in particular to methods for transmitting and receiving information, including in hydroacoustics.

A known method of transmitting data in sonar systems using phase-shifted signals ["Acoustic Journal" volume 56, No. 2, 2010. “Digital Shallow Acoustic Communications for Oceanological Applications” B.F. Kuryanov, M.M. Penkin, pp. 245-255], based on the formation and sequential transmission of a group of phase-shifted signals. The receiver performs sequential reception and correlation processing of the received signals. After correlation processing, an informational message is formed.

The disadvantage of this method is the low data transfer rate caused by the sequential transmission of signals in the form of long-length M-sequences.

The well-known "Method of transmitting and receiving information through waves", described in [RU 2282944, published on 08.27.2006, IPC H04L 27/10]. The method includes the steps of: matching the frequency response of the carrier sweeps with respect to the position of the frequencies, the slope and / or the shape of the carrier frequency change from sweep to sweep in a variable manner in accordance with the conditions of the transmission channel or access mode to the transmission channel, superimposing the information signal on the carrier wave, the frequency of which continuously or smoothly changes over a given time interval to form a sequence consisting of at least two carrier scans, with each carrier scan not set one or more units of information or bits, transmitting the generated signal that does not contain a reference component, filtering the received signal or cleaning the received signal from interference in the frequency domain to separate multipath components and evaluate the received signal with respect to the parameters carrying information.

The closest in technical essence is the "Method of transmitting information in communication systems with noise-like signals and a software product" [RU 2277760, published 05.27.2005, IPC H04L 27/32]. The method consists in the fact that during transmission, the stream of transmitted bits of the information signal is divided into a sequence of transmitted symbols, each of which contains a group of n≥1 consecutive successive bits of the stream; converting each of the transmitted symbols having a predetermined duration into one of predetermined noise-like signals of the same duration; when transmitting in each of the transmitted symbols, a combination of k bits, where 0≤k <n, at predetermined positions is converted into one of the predetermined noise-like signals; a combination of the remaining n-k bits of the same transmitted symbol in accordance with the selected encoding method is converted into a time delay when generating a noise-like signal; transmitting the sequence of noise-like signals obtained by such a conversion; when receiving, optimal reception is carried out to the maximum of correlation with the corresponding one of the predetermined noise-like signals to highlight the transmitted symbols; when receiving, a combination of k bits of each transmitted symbol is determined corresponding to that of the predetermined noise-like signals that ensured the maximum correlation at the optimal reception of this transmitted symbol ; determining the delay between the correlation maxima in each pair of successive transmitted symbols, which determines, in accordance with the method inverse to the selected encoding method, a combination of n-k bits for the first transmitted symbol in the said pair.

The disadvantages of these methods is the low data rate with sufficient noise immunity. To increase the data transfer rate in these methods, it is necessary to reduce the duration of the transmitted signal, which leads to a deterioration in the correlation properties of the signal, a decrease in the signal energy and, accordingly, to a decrease in noise immunity and operating range.

The task of the invention is to provide a high-speed data transmission method with high noise immunity.

The technical result of the proposed method of data transfer is to increase the data transfer rate.

The essence of the invention lies in the fact that they form N-bit messages by a transmitting subscriber device, where N is an integer greater than or equal to one. Each of the N bits is converted to a predetermined signal, the received signals are transmitted to the signal propagation medium, the transmitted signals are received, an N-bit message is generated by the receiving subscriber unit.

New in the claimed method is that before the communication session, an array of M signals is formed from predefined orthogonal ultrawideband chaotic signals, where M = 2N, so that each pair of orthogonal ultrawideband chaotic signals corresponds to two values of each of N bits. After the formation of N-bit messages by the transmitting subscriber unit, a packet of P N-bit messages is formed, where P is an integer greater than or equal to one, in each of the P messages each of the N message bits is converted to the corresponding signal from the array M of orthogonal ultra-wideband chaotic signals, form the total information signal from N signals, form a pack of P total information signals. Then the clock signal is generated, the clock signal is converted to a predetermined orthogonal ultra-wideband chaotic signal, the clock signal and the above packet of information signals are transmitted sequentially to the signal propagation medium. After receiving the clock signal, the received signal is convolved with the orthogonal ultrawideband chaotic signal corresponding to the clock signal. If the predefined threshold is exceeded by the signal obtained as a result of convolution, for each of the P received total information signals, the total information signal is convolved simultaneously with each of M orthogonal ultra-wideband chaotic signals, and the amplitudes of the convolution of the total information signal are compared with orthogonal ultra-wideband chaotic signals corresponding to two values each of N bits. Then, by the number of the orthogonal ultrawideband chaotic signal, the amplitude of convolution with which is large, the value of each of the N bits of the message is determined.

The figure shows a structural diagram of the transmitting A) and receiving B) parts of the communication system.

The data transmission method can be implemented when the communication system consists of a transmitting part containing a transmitting subscriber device (1), an encoding device (2), transmitting equipment (3), read-only memory (ROM) of the transmitting part (4), a transmitting synchronizer part (5), a radiating antenna (6), and a receiving part containing a receiving antenna (7), receiving equipment (8), a decoding device (9), a receiving subscriber device (10), a receiving part ROM (11), a receiving synchronizer parts (12).

The input of the transmitting subscriber device (1) is connected to the fourth output of the synchronizer of the transmitting part (5). The output of the transmitting subscriber device (1) is connected to the first input of the encoder (2), the second input of which is connected to the output of the ROM of the transmitting part (4), and the third input of the encoder (2) is connected to the first output of the synchronizer of the transmitting part (5). The output of the encoder (2) is connected to the first input of the transmitting equipment (3), the second input of which is connected to the second output of the synchronizer (5). The third output of the synchronizer of the transmitting part (5) is connected to the input of the ROM of the transmitting part (4). The output of the transmitting equipment (3) is connected to the input of the transmitting antenna (6).

The output of the receiving antenna (7) is connected to the first input of the receiving equipment (8). The second input of the receiving equipment (8) is connected to the first output of the ROM of the receiving part (11). The first output of the receiving equipment (8) is connected to the second input of the synchronizer of the receiving part (12), the second output of the receiving equipment (8) is connected to the first input of the decoding device (9). The second ROM output of the receiving part (11) is connected to the second input of the decoding device (9). The first output of the decoding device (9) is connected to the first input of the receiving subscriber device (10), the second input of which is connected to the second output of the receiving part synchronizer (12). The first input of the receiving part synchronizer (12) is connected to the second output of the decoding device (9). The first output synchronizer of the receiving part (12) is connected to the input of the ROM of the receiving part (11).

The data transmission method can be implemented in various communication systems - radio engineering, sonar, optical.

The implementation of the invention will be shown on the basis of a hydroacoustic communication system.

The transmitting subscriber device (1) generates the transmitted information by a signal from the synchronizer of the transmitting part (5), which is further divided into N-bit messages (for the further description, we take N = 8), i.e., the volume of each transmitted message will be equal to one byte. The transmitted information is collected in packets containing P messages. The subscriber unit may be, for example, a control unit for an uninhabited underwater vehicle that receives transmitted information.

Data transmission via the hydroacoustic channel is carried out by an information signal consisting of the sum of orthogonal ultra-wideband chaotic signals (SINR), the ensemble of which is digitally generated in advance for a specific value of N bits and recorded in ROM of both transmitting (4) and receiving parts (11) of subscribers . The ensemble of SINR signals can be formed, for example, according to the algorithms presented in the publication “Development and study of complex chaotic signals for use in broadband digital information technologies” [Journal of Radio Electronics ”, No. 7, 2012, authors R.V. Belyaev, V.V. Wheels].

An array of 2N = 16 (sixteen) SINR signals is used to encode the transmission message for subscribers.

By a command from the synchronizer (12), in accordance with the bit values in the byte of the transmitted message, the corresponding eight SINR signals from the ROM of the transmitting device (4) are selected and transmitted to the encoding device (2). Then, in the encoding device (2), the selected eight SIRR signals in digital form are combined into one information signal. Similarly, information is encoded for several messages (bytes), from which a packet of P messages (bytes) is further formed.

After the formation of the packet at the command of the synchronizer of the transmitting part (5), the SNRCH of the clock signal loaded from the ROM of the transmitting device (4) is selected, and the clock signal is formed, which is then placed at the beginning of the packet.

The generated signal containing the clock signal and the packet, by command from the synchronizer of the transmitting part (5), enters the transmitting equipment (3). Further, in the transmitting equipment (3), the generated signal is converted to analog form and its radiation is transmitted to the aqueous medium by the transmitting antenna (6).

The receiving part of the subscriber receives the generated signal with the receiving antenna (7), its amplification, filtering and analog-to-digital conversion in the receiving equipment (8). In the receiving equipment (8), the clock signal is constantly searched for by convolution of the received signal and the SINR of the signal corresponding to the clock signal stored in the ROM of the receiving part (11) of the subscriber. If the amplitude of the signal obtained as a result of the convolution is exceeded over a predetermined threshold, a decision is made to detect the clock signal, after which a command is received in the synchronizer of the receiving part (12).

After detecting the clock signal at the command of the receiving part synchronizer (12), simultaneous correlation processing of the total information signal with all sixteen signals in the subscriber's receiving equipment is turned on. Due to the correlation properties of the SINR signals, the decoding of each bit of information in a byte occurs with minimal influence of the rest of the SINR signals. The processing results are sent to a decoding device (9), where by comparing the amplitude values of the signals minimized with each of the two SINR signals corresponding to the two values of each bit, the value of each bit of information is determined. At the end of the decoding process, a signal is supplied from the second output of the decoding device (9) to the first input of the synchronizer (12), which gives a command to read data to the receiving subscriber device (10). Thus, all eight bits of information are extracted from the total information signal. Next, the decoding process is repeated for all P messages (bytes) of the received packet.

SIRF signals vary both in phase and in amplitude, which makes it possible to create ensembles of orthogonal signals of large magnitude, having high correlation properties even at short durations, and thus allow transmitting a large amount of information in one time interval: 64, 128, etc. . bit. In this case, the duration of the SINR signal can be selected from the calculation of energy ratios to achieve the required operating range. Thus, the proposed method can significantly increase the data rate with high noise immunity.

Claims (1)

The data transmission method, which consists in generating N-bit messages by a transmitting subscriber device, where N is an integer greater than or equal to unity, converting each of N bits into a predetermined signal, transmitting the received signals to the signal propagation medium, receiving transmitted signals form an N-bit message by the receiving subscriber unit, characterized in that before the communication session an array of M signals is formed from predetermined orthogonal ultra-wideband chaotic signals, where M = 2N, thus m, that each pair of orthogonal ultrawideband chaotic signals corresponds to two values of each of N bits, and after the formation of N-bit messages by the transmitting subscriber unit, a packet of P N-bit messages is formed, where P is an integer greater than or equal to one in each from P messages, each of the N message bits is converted into a corresponding signal from an array of M orthogonal ultra-wideband chaotic signals, a total information signal is formed from N orthogonal ultra-wideband chaotic c signals, form a burst of P total information signals, form a clock signal, convert the clock signal to a predetermined orthogonal ultra-wideband chaotic signal, transmit the converted clock signal first, and then the above-mentioned packet of information signals to the signal propagation medium, after receiving the clock signal, carry out the convolution of the received signal from the orthogon a chaotic signal corresponding to a clock signal, when a predetermined threshold is exceeded by a signal, convolution, for each of the P received total information signals, the total information signal is convolutioned simultaneously with each of M orthogonal ultra-wideband chaotic signals, the amplitudes of the total information signal convolution are compared with the orthogonal ultra-wideband chaotic signals corresponding to two values of each of the N bits, by number orthogonal ultrawideband chaotic signal, the amplitude of the convolution with which is large, determine the value of each of the N bits of the message.

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