SU1660185A2 - Repeater station - Google Patents

Abstract

This invention relates to radio. The purpose of the invention is to increase the reliability of conveying the retransmitted information. The repeater contains receiver 1, transmitter 2, service signal decoder 3, signal-to-noise ratio meter 4, service signal memory unit 5, radiated power control unit 6, adders 7 and 8, elements 9 and 10, trigger 11, elements NOT 12 and 13, switch 16. The generator 14, counter 15, memory blocks 17 and 18, command driver 19, counting trigger 20, accumulators 21, 27 and 28, unit 22 of comparison, decoders 23 and 24, and driver 25 are entered into the repeater. and 26. 1 Il.

Description

The invention relates to radio communications and can be used in the construction of repeaters located on moving objects.

The aim of the invention is to increase the reliability of relaying information.

The drawing shows a structural diagram of a repeater.

The device comprises a receiver 1, a transmitter 2, a decoder 3 service signals. signal-to-noise ratio meter 4, service signal memory unit 5, radiated power control unit 6, first 7 and second 8 adders, first 9 and second 10 I elements, trigger 11, first 12 and second 13 elements NOT, generator 14, counter 15 , switch 16, first 17 and second 18 memory blocks, command shaper 19, counting trigger 20, third adder 21, comparison unit 22, first 23 and second 24 decoders, first 25 and second 26 shapers, fourth 27 and fifth 28 adders.

The device operates as follows.

In the initial state, the repeater is in receive mode, the transmitter 2 is off, the trigger 11 is in the zero state, the trigger 20 is also, say, in the zero state. From the output of control unit 6, commands to reduce the radiation power of transmitter 2 are not given. Transmitter2 is ready for operation with maximum power. The subscriber address is entered in the shaper 19 teams. The pulse generator 14 in the initial state is ready for operation, the counter 15 is reset. Shaper 19 teams in the initial state is ready to work. The first, second, third and fourth inputs of the decoder 24 receives logical zero signals. At the output of the decoder 24 there is a signal of a logical unit that locks the comparison circuit 22, and this signal also removes power from the first 17 and second 18 memory blocks and the switching unit 16 commutes the output of receiver 1 with the modulation input of transmitter 2.

When a call signal is received at receiver 1, it is selected, after which this signal is sent to decoder 3. If the received call signal is its own, then the decoder 2 command is generated at the output of the decoder, which is transmitted through the adder 7 to the first input of the And 9 element, as well as to the single input of trigger 11 and translates it into a single state. If the signal received by receiver 1 has a power providing a predetermined signal-to-noise ratio at the output of receiver 1, i.e. if the required communication quality is ensured, then the transmitter 2 command on the carrier is generated at the output of the meter 4, which is fed to the second input of element I4 9. If there is a signal at the first input of element And 9, then the output of the transmitter 2 command at maximum power. A call signal from the output of the receiver enters through the switching unit to the modulation input of the transmitter 2 and is relayed. The command to turn on the transmitter 2 at maximum power also arrives at the input of the memory unit 5, as a result of which the call signal memory command appears, the formation of which ends after the transition from the relay mode to the receive mode after a predetermined time. At the same time, a single signal appears at the first input of the decoder 24. At the same time, a single signal remains at the output of the decoder 24 (direct switching, blocks 17, 18, as well as block 22 are disabled). At the end of the call signal, the call-on transmitter command at the output of the decoder 3 disappears, however, due to the receipt of the call signal memory command from block 5 through the adder 7 to the first input of the And 9 element, the second input of which receives the enable command by carrier, the transmitter 2 remains on and relaying is carried out, which continues until the disappearance of the high-frequency signal at the input of the receiver 1, after which the command to turn on the carrier at the output of the meter 4 disappears and the transmitter 2 is turned off. The next inclusion is carried out automatically when a high-frequency signal appears at the input of the receiver 1 during the memory time.

If at the selected operating frequency of transmitter 2, its out-of-band and spurious emissions reduce the signal-to-noise ratio at the output of receiver 1 to an unacceptable value, then the command at the output of meter 4 disappears, and therefore, the command at the output of element 9 disappears. Since a single signal the input of the adder 8 is saved due to the fact that the trigger 11 is in a single state, the transmitter 2 remains on. However, at the same time, a signal appears at the output of the element NOT 12, which is fed to the first input of the And 10 element, the second input of which receives a single signal from the output of the trigger 11. At the output of the And 10 element, a signal appears that starts the generator 14 and the control unit 6. In this case, the latter generates a control signal, which is input to the power control input of the transmitter 2, which leads to a decrease in the radiated power. The signal-to-noise ratio at the output of the receiver 1 improves, at the output of the meter 4 a command for turning on the transmitter 2 on the carrier appears, as a result of which the signal arriving at the control input of the transmitter 2 appears at the output of the element And 9. leads to the loss of the signal at the input of the control unit 6, as a result of which the decrease in power of the transmitter 2 is stopped. The generator 14 stops the formation of pulses, the counter 15 stops. After a specified time interval has elapsed since the receipt of the call signal, the call signal memory command disappears at the output of block 5, therefore, the signal disappears at the output of the adder 7 and, as a result, the signal disappears at the output of the And 9 element, and the signal that translates trigger 11 to zero state. At the output of the adder 8, there is no signal, PRD 2 is turned off. In addition, when a signal appears at the output of element And 10 (serves to start the control unit 6 in order to generate a control signal to reduce the radiation power of transmitter 2), a pulse generator 13 is started, from the output of which the generated pulses begin to flow to counter 15. Counter 15 filling time is chosen in such a way that it is equal to the time of reducing the radiation power of the transmitter 2 to the minimum acceptable level at which the specified quality of relaying information to a given subscriber is ensured . If the counter 15 does not overflow in the process of reducing the radiation power of the transmitter 2, then the slave device .zet is the same as described. If the counter overflows (a further decrease in the power of transmitter 2 can lead to loss of communication or an excessive level of errors when relaying information), then a signal appears at its output, which is fed to the fourth input of the decoder 24, at the output of which a signal arrives at the second input of the block 16 (switching to memory blocks), to the control inputs of the first 17 and second 18 memory blocks (inclusion of memory blocks), to the control input of the comparison circuit 22 (allows the operation of the comparison circuit). A single signal from the counter 15 is fed to the second input of the decoder 23, at the first input of which there is a single signal from the output of the element And 10 and, as a result, a logic zero signal is generated at the output from the decoder 23, as a result of which the control unit 6 stops generating a reduction signal power of the transmitter 2. A single signal from the output of the counter 15 also goes to the input of the installation of the maximum radiation power of the transmitter 2 (it goes into maximum power mode), to the start input of the shaper 19 commands ( Tel 19 begins to form the transition command to the alternate operating frequency). The signal from the output of the decoder 24 allows the recording of information in blocks 17 or 18 of the memory, the signal from the output of the receiver 1 begins to arrive at the information input of the comparison unit 22, which, if there is a signal at the output of the receiver 1, generates a single signal, which from its first output goes to trigger input 20. Then a signal is generated at its output. which is fed to the write / read switch input of the first memory unit 17 and enables the recording of information from the output of the receiver 1 (via the switching unit 16). The switching unit 16 previously switched the output of the receiver 1 to the inputs of the memory blocks 17 and 18 and the relayed information from the output of the receiver 1 goes to the information inputs of the recording blocks 17 and 18 of the memory and is fixed in one of them (in this case, in the first memory block 17). In this case, the memory unit 18 switches to the information reading mode, since the relayed information is not yet fixed in it, the reading does not occur. At the same time, the signal from the counter 15 puts the transmitter 2 in the radiation mode of maximum power. At the same time, the overflow signal from the output of counter 15 is triggered by the command generator 19, which generates a command for switching to the first spare relay frequency (the command contains the subscriber’s address and the serial number of the spare relay frequency), which from its first output goes to the modulation input of transmitter 2 and is emitted. After that, after the time required for transmission, the driver 19 enters the transition command to the first spare frequency of the transmitter 2, which is transmitted to the fourth control input of the transmitter 2. By this command, the transmitter 2 is redistributed to the first spare frequency. At the same time, this command resets counter 15.

When the information signal at the output of the receiver 1 disappears, block 22 generates a signal that, via trigger 20, transfers the memory block (in this case, block 17) to the information reading mode. Information recorded by the memory block 17 through the switching block 16 is transmitted to the modulation transition of transmitter 2 and emitted , When information appears on the information output of the memory unit 17, the first driver 25 generates a single signal, which is fed to the second input of the adder 27 and duplicates the command to turn on the transmitter 2 on the carrier. The transmitter 2 is turned on during the entire cycle of reading the relayed information from the memory unit 17. If at this time the relay signal again appears at the output of the receiver 1, then the reading of information from the memory unit 17 continues and the cycle of writing information to the second memory unit 18 begins. Further, the operation of the circuit is repeated. If at the outputs of the first and second shapers there are no single signals (reading from none of the memory blocks is carried out), and the memory block 5 generates a single signal, then the decoder 24 generates a command at its output, which is fed to the control input of the switching unit 16, According to this to the command, block 18 carries out switching directly from the output of receiver 1 and the modulation input of transmitter 2. If the signal at the output of memory block 5 is also zero, then a signal appears at the output of decoder 24, by which block 16 carries out mutation of the output of the receiver 1 with the modulation input of the transmitter 2, the memory blocks 17 and 18 are turned off, the prohibition block 22 is blocked. When a new call signal appears at the input of receiver 1, the repeater operation cycle is repeated.

Claims (1)

Claim Repeater St. No. 1378G71, on ταμ, which, in order to increase the reliability of relaying information, introduced sequentially connected generator and counter, the first and second memory blocks, command generator, counting trigger, comparison unit, the first and second decoders, the first and second shapers, the third, fourth and fifth adders, the output of the second adder is connected to the control input of the transmitter through the fourth adder, the output of the receiver is connected to the information input of the transmitter through series-connected switches op and fifth sum | a torus, the output of the second element And is connected to the input of the radiated power control unit through the first decoder, the output of the second element And is connected to the input of the generator, the output of the service signal memory block is connected to the first input of the second decoder, the output of which is connected to the control inputs of the switch, unit comparison of the first and second memory blocks, the output of the receiver is connected to the input of the comparison unit, the output of which is connected to the input of the counting trigger, the direct and inverse outputs of the counting trigger are connected to the switching inputs recording, reading, respectively, of the first and second i memory blocks, the output of which is connected respectively by the first and second inputs of the third adder, the output of which is connected to the input of the first driver and to the second information input of the switch, the second output of which is connected to the input of the second driver and information inputs of the first and the second memory blocks, the output of the first driver is connected to the second input of the second decoder and to the second input of the fourth adder, the output of the second driver is connected to third by the input of the second decoder, the counter output is connected to the second input of the first decoder, the fourth input of the second decoder, the input of the command shaper and the input of the radiation setting for maximum power, the first output of the shaper is connected to the second input of the fifth adder, the second output of the shaper is connected to the input of the carrier frequency control transmitter and counter reset input.