SU1075426A1 - Communication system - Google Patents

Abstract

1. A COMMUNICATION SYSTEM containing on the transmitter side an information source connected to a multiplexer, a start-up pulse generator, the output of which is connected via a clock pulse generator to the control input of a multiplexer whose output is connected to a transmitter, and a station number generator connected to the second input of a multiplexer, on a repeater receiver, a decoder, a multiplexer connected to the input of the transmitter, and on the receiving side a receiver, a decoder and a receiver of information, characterized in that increasing the reliability of communication; the synchronizer, the first register, the error detection block and the second register are installed on the repeater in series; n channels, each of which consists of a series-connected AND element and a delay unit, an OR element, a station number generator, a generator of so-called pulses, and a delay node. moreover, the receiver output is connected to the synchronizer input and the second input of the first register, the output of which is connected to the second input of the second register, and through a digital converter to the inputs of the elements AND of each channel, the outputs of the delay blocks of each channel through the serially connected element OR and the clock generator connected to control multiplexer input, the inputs of which are connected respectively to the output of the second register and the output of the station number generator, and the synchronizer output through the delay node is connected to volts The inputs of the AND elements of each channel, and on the receiving side are installed in series (L connected synchronizer, first register, error detection block and second register, and- + 1 channels, each of which consists of series-connected element And delay block / and the OR element and the delay node, the output of which Ifk is connected to the synchronizer input and the second input of the first register, the hyste / output of which is connected via the decoder to the inputs of the AND elements of each channel, the outputs of the load blocks of each channel through elendND 3, ment OR are connected to the input of recipients of information, another input of which is connected to the output of the second register, the second input of which is connected to the output of the first register, Ja the output of the synchronizer through the delay node is connected to the second. the inputs of the elements And P channels. 2. Pop-up system 1, characterized in that the delay node of the repeater and the receiving side consists of a series-connected trigger, a counter and a decoder, the output of which is connected to the input

Description

Trigger and clock generator connected to the second input of the counter, with the second input

the trigger and output of the decoder are, respectively, the input and output of the delay node.

The invention relates to radio, communications and can be used in the transmission of telecontrol and tele-signaling signals to a large group of distributed objects in the presence of areas of uncertain reception.

Communication systems using a transponder are known, comprising a transmitting device with a modulator and a transmitter at frequency f, on-board equipment of the repeater with a receiver at a frequency f, an auxiliary step, a transmitter at a frequency fji receiving device with a receiver at a frequency ± H and a demodule torus G.

Ego communication system is unreliable, because it does not allow the transmitting device to work directly on the receiving device, even if they are located close to each other, and requires the presence of a repeater, the failure of which causes the connection to disappear. The presence of two frequencies worsens the use of the radio spectrum, increases the mutual interference between different communication systems.

The closest technical solution to the invention is a communication system comprising on the transmitting side an information source connected to a multiplexer, a trigger generator, the output of which through a clock generator is connected to the control input of a multiplexer whose output is connected to a transmitter, and a station number generator connected to the second input of the multiplexer, on the repeater - receiver, decoder, multiplexer connected to the input of the transmitter, and on the receiving side - receiver, decryptor torus and recipient information SJ.

A disadvantage of the known system is the presence of four frequencies for communication, which impairs the use of the radio frequency spectrum and increases mutual interference. In addition, the system is unreliable, since in case of a failure of the transponder, the time synchronization of the entire system works, there is a complete loss of communication.

The purpose of the invention is to increase the reliability of communication.

To this end, in a communication system containing on the transmitter side an information source connected to a multiplexer, the start-up pulse generator i, whose output is connected via a clock generator to the control input of a multiplexer whose output is connected to a transmitter, and a station number generator connected to the second input multiplexer, on the repeater - a receiver, a decoder, a multiplexer connected to the transmitter input, and on the receiving side a receiver, a decoder and a receiver of information, on the repeater The synchronizer, the first register, the error detection block and the second register, n channels, each of which consists of a series-connected AND element and a delay block, an OR terminal, a station number generator, a clock generator and a delay node, and the receiver output, connected to the synchronizer input and the second input of the first register, the output of which is connected to the second input of the second register, and through the decoder to the inputs of the AND elements of each channel, the outputs of the delay blocks each to A serially connected element OR and a clock generator are connected to the multiplexer control input, the inputs of which are connected respectively to the output of the second register and the output of the station number generator, and the synchronizer output is connected to the second inputs of the AND elements of each channel and on the receiving side sequentially synchronizer connected first register, error detection block, second register, n + 1 channels, each of which consists of series-connected el And and the delay unit, as well as the OR element and the delay node, the output of the receiver is connected to the synchronizer input and the second input of the first register, the output of which is connected to the inputs of the AND elements of each channel through the decoder, the outputs

The delay blocks of each channel through the OR element are connected to the input of the recipient, the other input of which is connected to the output of the second register, the second input of which is connected to the output of the first register, and the output of the synchronizer through the delay node is connected to the second inputs of the AND elements of each of the n channels.

In this case, the delay node of the retranslator and the receiving side consists of a trigger connected in series, a counter and a decoder, the output of which is connected to the trigger input, and a clock generator connected to the second input of the counter, the second trigger input and the decoder output are respectively, the input and output of the delay node. .

Figure 1 shows the structural electrical circuit of the proposed system (front side and repeater 1); Fig. 2 is a structural electrical circuit of the receiving side (communication system); on Fig. 3 - time diagrams of her work.

The proposed communication system comprises a transmission side 1, an information source 2, a station number generator 3, a generator of 4 starting pulses, a generator of 5 clock pulses, a multiplexer 6, a transmitter 7, an antenna 8, retransmission. L tor 9, node 10 delay, antenna And, receiver 12, synchronizer 13, first register 14, second register 15, error detection block 16, clock generator 17, decoder 18, elements AND 19, delay blocks 20, element OR 21, The shaper 22 is a station number, a multiplexer 23, a transmitter 24, a delay node 10 consisting of a trigger 25, a clock generator 26, a counter 27 and a decoder 28, a receiving side 29, and a receiver 30 of information.

The communication system operates as follows.

The signal from the generator 4 start-up pulses starts working generator 5 clock pulses. According to clock pulses, input from the generator 5, multiplexer 6 starts connecting signals from source 2 and generator 3 of the station number to the input of transmitter 7, and also performs error-correcting message coding. Each station is assigned its own number corresponding to the sequence number of the station in the relay chain. The first number will always be at the transmitting station, the second number, as a dragon, is at the repeater 9 closest to the transmitting station, the penultimate number, as a rule, is at the repeater closest to the receiving station, the last number will always be at the receiving one. station. The signal from transmitter 7 enters antenna 8 and is: radiated by it. The emitted from the gnap is shown in the temporal diagram (Fig.34).

0

At a time equal to the propagation time of the radio waves from the antenna 8 of the transmitting side 1 to the antenna 11 of the transponder 9 or side 29, this signal gets from the antenna 11 to the receivers 12. Depending on the relative position of the stations, the propagation time of the radio signal may vary from Oh before. The time interval during which the radio signal transmitted during T by the transmitter 7 can be BLUE is received by receivers 12 (FIG. 35). The extreme possible temporal positions of the received signal with a duration T in the diagram are shaded. From receivers 12, the signal enters the synchronizer 13 and to the first rugister 14, which, in accordance with the signals of the synchronizers 13, stores the received message. Block 1 b determines the number of errors in the message recorded by the register 14 and if their number is less than some initial threshold

The 5 values allow the rewriting of the received message from the register 14 to the register 15. The decoder 18 connected to the register 14 determines the number of the station from which the message was received and, if this number is

0 is less than the station number that received the message, generates a potential signal at the corresponding output. In this case, it will be the first number, since the message transmitted 5 the transmitting side 1 and, accordingly, the first output of the decoder 18

At the end of the reception of the message s, the pulse of the end of reception, formed from the pulse of the initial synchronization of the synchronizer 13 by means of the node 10 delay at time T, arrives at the group of elements AND 19, the second inputs of which receive a signal from the corresponding outputs

5 of the decoder 18. If they coincide, at the output of one of the elements AND 9, in this case, the first appears with a pulse arriving at the corresponding delay block 20, delaying the pulse for time tin.

The pulses in all delay blocks 20 are summed on the element OR 21. When a pulse appears at the output of the element OR 21 in the repeaters 9, the generator 17 begins to work so 5

Tov pulses. According to its signals, the multiplexer 23 starts, in turn, to connect the signal from the register 15 and the world controller to the 22 station number to the input 24 of the resolver 24. A signal from the output of transmitter 24 enters and radiates from antenna 11. The signal emitted by the transponder 9 is received via the antenna 11 by the receivers 12 of all stations. The reception cycle is repeated.

I To prevent the system from cycling in the system, only message information from those stations whose number is lower than the repeater number 9 that received the message is subjected to further retransmission. Therefore, the number of decoding parameters of a rator is 18, the number of elements is AND 19, and the number of delay blocks 20 is one less than the station number.

The time diagram () shows the possible position of the transmitted signal by the repeater 9, and the second number, and the time diagram (Fig. 32-) shows the possible position of the received signal from the station. number two, in the diagram (fig.: zg) - the possible position of the transmitted signal by the relay station having the third number, in the time diagram (fig.ZC) - the possible position of the received signal from this station, in the time diagram (fig. ЗЖ) - possible position of the pulse at the output of the OR element 21 of the receiving side 29. At the receiving side 29, this pulse allows the transfer of information from the register 15 to the recipient 30 of information. I

Due to the fact that the propagation time of radio waves from one station to another uncertainty, the interval of possible temporal positions of the received and transmitted signal increases as the station number increases to exclude the temporary imposition of information transmissions from. different stations.

When receiving a signal from each of the stations, the error detection block 16 permits the rewriting of information from register 14 to register 15 only if the information received from the station with a higher number is higher in quality than the previously received information from the station with a smaller number

Error detection unit 16. In the simplest case, using a parity-correctable interference code, this is the parity element of the received message. Overwriting from register 14 to register 15 is permitted only if

No error was detected in the printable and recorded in register 14 message.

As a result, by the time the relay starts, the information received with the least amount of errors is found in the repeaters or when the information is transmitted to the recipient 30 in the receiving station 10 in the register 15.

The 20 h-support blocks in the repeaters 9 and on the receiving side 29 operate in the following manner.

Received at the input of the trigger 25, the signal throws it into position, allowing the counter to count 27 pulses received at its input from the generator 17 clock pulses. After counting a certain number of pulses, determined by decoder 28, the pulse recovers trigger 25 to its initial state, 3 times the pulse counting to counter 27. The output of decoder 28 is the output of counter.

The magnitude of the pulse delay in the delay blocks 20 is selected on the basis of the possibility to exclude the possibility of simultaneous operation of several transmitters 24 for transmission.

The elimination of the possibility of simultaneous operation of several transmitters 24 for transmission completely eliminates the possibility of radio wave interference on the ground. The requirements for the placement of repeaters 9 and receiving stations 29 become uncritical, which greatly simplifies the installation and operation of communications equipment. Since, the formation on the receiving side 29 can flow in several ways, the error detection unit 16 can select the least distorted one with fewer errors from several received messages, which increases the reliability of the received message. A malfunction or absence of one or several repeaters 9 may not necessarily lead to a communication failure, since the possibility of receiving information from other repeaters 9 remains. This increases the reliability of the communication.

The economic efficiency is also vigorous in reducing the cost of installation and operation of communication equipment, since using the proposed communication system does not require complicated work to find the optimal installation sites for repeaters 9. Transmitters 24 used in stations can be single-frequency are homogeneous and interchangeable, and their antennas 11 are simple and weakly directed.

Claims (2)

1. A COMMUNICATION SYSTEM comprising, on the transmitting side, an information source connected to a multiplexer, a trigger pulse generator, the output of which is connected via a clock pulse generator to the control input of the multiplexer, j output of which is connected to the transmitter, and a station number former connected to the second input of the multiplexer, on the repeater, a receiver, a decoder, a multiplexer connected to the input of the transmitter, and on the receiving side, a receiver, a decoder and a receiver of information, characterized in that, for the purpose of higher Ia connection reliability on the repeater are set consecutively connected synchronizer, a first register unit and a second error detection register; η channels, each of which consists of a series-connected AND element and a delay unit, an OR element, a station number generator, a clock generator and a delay unit. moreover, the output of the receiver is connected to the input of the synchronizer and the second input of the first register, the output of which is connected to the second input of the second register, and through the decoder to the inputs of the AND elements of each channel, the outputs of the delay blocks of each channel through the series-connected OR element and the clock generator are connected to the control input a multiplexer, the inputs of which are connected respectively to the output of the second register and the output of the generator of the station number, and the output of the synchronizer through the delay node is connected to the second input I will give AND elements of each channel, and on the receiving side, a synchronizer, a first register, an error detection unit and a second register, 11 + 1 channels, each of which consists of a series-connected AND element and a delay unit, as well as an OR element and a delay unit are installed moreover, the output of the receiver is connected to the input of the synchronizer and the second input of the first register, the output of which through the decoder is connected to the inputs of the AND elements of each channel, the outputs of the delay blocks of each channel through the OR element are connected to ode recipient information, the other input of which is connected to the output of the second register, a second input coupled to an output of the first register, (a synchronizer output from the delay unit coupled to the latter. inputs of elements AND channels. 2. The system according to π.1, characterized in that the delay unit of the repeater and the receiving side consists of sequentially connected trigger, counter and decoder, the output of which is connected to the input A trigger and a clock generator connected to the second input of the counter, the second trigger input and the decoder output being the input and output of the delay node, respectively.