SU734886A1 - Radio communication system - Google Patents

Description

(54) RADIO COMMUNICATION SYSTEM

The invention relates to communications and can be used for organizing radio communication between a central station and a plurality of peripheral stations at close frequencies with the implementation of full-duplex radio communication between the central and each peripheral station on one working frequency. A radio communication system is known, comprising, at a central station, by the number of peripheral stations in the system, transmitters and receivers connected to the antenna switch, which are connected to the inputs of the information allocation unit information, the control unit, the output of which is connected to the control input of the antenna switch, and the peripheral stations - a transmitter and a receiver connected to the inputs of the information allocation unit information, connected to the antenna switch, the control signal of which is connected to the control output of the input block and a "read block allocation information 1. However, in the known communication system, synchronization is carried out peripheral stations central station, or any of the peripheral stations can not enter singly into communication with the central station. The purpose of the invention is to ensure the independent operation of the peripheral stations of the system with the central station. To do this, the radio system containing, at the central station, the number of peripheral stations in the system, are connected to the antenna switch by transmitters and receivers that are connected to the inputs of information about the allocation unit information, the control block whose output is connected to the control input of the antenna switch, and at the peripheral station, a transmitter and receiver connected to the "information allocation unit information" inputs connected to the antenna switch, the control input of which is connected to the control output its block and input "read block information allocations, entered at the central station, by the number of peripheral stations, blocks separating the leading edges of information pulses, blocks separating the leading edges of information pulses, elements AND and delay elements for the duration of information pulse, multi-input element OR and delay element half the duration of the information pulse, and at the peripheral station - a block selection in front of them, the fronts of information pulses, the block selection of the rear edges of the information pulses, a key and a delay element for half the duration of an information pulse, while at the central station the output of each receiver is connected to the inputs of the block of the leading edges of the information pulses and the block of the falling edges of the information pulses, the outputs of which are directly, and the output of the block of the leading edges of the information pulses through the delay element on the duration of the information pulse, are connected respectively to the first and second inputs of the AND element, which is Dinen with input "read block, information extraction and to one of the inputs of the element OR whose output is connected to input" triggering the control unit through the delay element for half the information pulse duration and input for the separation of the leading edges of the information pulse and the pulse is connected respectively to the inputs of the "recording and" erasing of the information extraction unit, and at the peripheral station of the system, the output of the receiver is connected through the allocation unit of the rear of fronts of information pulses and through series-connected block for separating the leading edges of information pulses and the key respectively to the inputs "erasing and -" recording the block of information extraction, and the output of the block for separating the leading edges of information pulses through the delay element for half the duration of the information pulse unit, the output of which is connected to the control input of the key.

FIG. I shows the structural electrical circuit of the central station; in fig. 2 is a diagram of the peripheral station.

The radio communication system contains an antenna switch 1 at the center of the station, the number of peripheral stations transmitters 2, receivers 3, blocks 4 of the front edges of information pulses, blocks 5 of the back edges of the information pulses, elements 6 AND, element 7 of the delay for the duration of the information pulse , information extracting unit 8, as well as control unit 9, delay element 10 for half the information pulse duration, multi-input element 11 OR, antenna. 12.

At the peripheral station, the system contains an antenna switch 13, a transmitter 14, a receiver 15, a block of 16 output: 1/11

front edges of information pulses, block 17 of allocation of back edges of information pulses, control unit 18, key 19, delay element 20 for half the duration of information pulse, block 21 of information extraction, antenna 22., ..

The system works as follows.

The periods of operation of the central and peripheral stations are related as 3: 1. The operation period of each station is divided into equal periods of transmission and reception. If the half-life duration of the peripheral station is taken over t, then the half-time duration of the central station is equal to 3 sec. At each station, discrete values of B equidistant points are received.

The system works in several modes.

A. The central station is in standby mode, the peripheral station starts operation.

At the peripheral station operating, for example, at the frequency FL, the control unit 18 is started, from the output of which the pulses of duration t arrive at the antenna switch 13, which makes alternate connection to the antenna 2. of the transmitter 14 and the receiver 15 at the time t.

At the central station, the receivers 3 in standby mode are connected to their antennas 12. The signal from the peripheral station at the frequency fj. arrives from the antenna 12 to the input of the receiver 3 tuned to the frequency fi., and further, from the output of the receiver 3, gets to block 4, from which the pulse arrives at delay element 7 and to the input “record of block 8. This signal 8 records information pulse coming from the output of the receiver 3 to the “information” block of the block 8. From the output of the delay element 7, a pulse arrives at the input of the element -6 I and the input “erasing the block 8. At the same time, the pulse b comes from the output block 5. From the output of element 6 and the signal is fed to the input "read and" Tyrany unit 8, whereby there is produced reading and erasing information. Simultaneously, the signal from the output of the element 6 and the; steps on the element 11 OR, from which the signal passes, the delay element 10 and on the start trigger the control unit 9. The latter sends a signal of length 3 to the control input of the antenna switch 1, which disconnects from the antennas 12 the inputs of all receivers 3 and connects to them for the time Zg the outputs of the transmitters 2, after the time 3t with the control unit 9 has elapsed, the antenna switch 1 is given a signal to connect to the antennas 12 for the time 3t of the inputs of the receivers 3 and disconnect them from the outputs of the transmitters 2. Repeating cycles Are

as long as the control unit 9 is on.

The response signal of the central station at frequency f arrives at the peripheral station operating at frequency f. The antenna 22 receives a signal in the form of 3t pulses. The control unit 18, when a signal is applied to the antenna switch 13 to connect the antenna 22 to the receiver 15, simultaneously via the public key 19, sends a signal to the recording input of the block 21 to record information received from the receiver 15 the information of the block 21 is input. After the time has elapsed, the control block 18 removes the write signal, sends a signal for opening the key 19 and a signal for reading and erasing in block 21. After this, the cycle is repeated and the signal is written again for recording, however the duration of the received signal is less than 3 tons; then block 17 is triggered. This causes a signal to the input "erase block 21, and in it erase the recorded information without reading it.

The order of operation of the peripheral station is periodically repeated.

B. The established operation mode of the central station, the next peripheral station is in communication with the central station.

At the central station, the control unit 9 sends pulses of duration 3T to the antenna switch 1, which makes alternate connections; to the antennas 12 transmitters, 2 and receivers 3. From the peripheral station operating on

frequency f, pulses of duration t arrive at the antenna 12 of the central station. The signal from receiver 3 is fed to the input of block 4, from which the signal is sent to delay element 7 and to the input "record of block 8. This signal records information from the receiving output -, nick 3 to input "information of block 8. After time t from delay element 7 and block 5, a signal is sent to element 6 And, from the output of which a signal is sent to inputs" reading and "erasing block 8. This signal produces reading and erasing information. If, at the expiration of the time t from the beginning of the recording, from element 6 I there is no signal, then the information is cleared in block 8 without reading it.

B. The duty mode of the peripheral station, the central station starts operation,

The antenna 22 of the peripheral station, which is in standby mode (the receiver 15 through the antenna switch 13 is connected to the antenna 22), begins to receive pulses with a duration of this central station. These pulses are passed through the receiver 3 to the input of the block 16, which DID Starts the locking of the key 19 and thus locks the information recording circuit. At the same time, these pulses come to the delay element 20, from the output of which, after time 0.51, an automatic start signal is sent to the control unit 18, which turns off the output of the delay element 20 from its start and sends pulses to the antenna switch 13, which alternates connection to the antenna 22 of the output of the transmitter 14 and the input of the receiver 15. When connected to the antenna 22 of the output of the transmitter 14, a pulse from the control unit 18 arrives at the control input of the switch 19 and opens it. The same impulse arrives at the “write and erase” inputs of block 21 and reads and erase information.

Thus, the system provides duplex communication between the central station and a plurality of peripheral stations at close frequencies, wherein the duplex communication between the central and each peripheral station takes place at the same operating frequency.

The system also provides the possibility of entering into communication with the central station of any of the peripheral stations without permanent radiation of the central station, ensures the independence of the reception of information from the distance the peripheral stations are from the central one.

Claims (1)

A wireless communication system comprising, at a central station, by the number of peripheral stations in the system, transmitters and receivers connected to the antenna switch, which are connected to the inputs of the information allocation unit information, the control unit whose output is connected to the control input of the antenna switch, and the peripheral station - a transmitter and a receiver connected to the inputs of the information allocation unit information. connected to the antenna switch, the control input of which is connected to the output of the control unit and the input "read information extraction unit", which, in order to ensure the independent operation of the peripheral stations of the system with the central station, is introduced at the central station , blocks for separating the leading edges of informational impulses, blocks for separating the leading edges of informational impulses, elements And and elements of delay for the duration of an information impulse, are multi-input the OR element and the delay element are half the information pulse duration and, at the peripheral station, there is a block for separating the leading edges of information pulses, a block for highlighting the leading edges of information pulses, a key and a delay element for half the duration of the information pulse, while at the central station the output of each receiver is connected to the inputs of the block for the separation of the leading edges of information pulses and the block for the separation of the back edges of information pulses, the outputs of which are directly, and in The output of the front-edge selection block of information pulses through the delay element for the duration of the information pulse is connected respectively to the first and second inputs of the AND element, which is connected to the input of the information extraction block readout and to one of the inputs of the OR element, the output of which is through the half delay element the duration of the information pulse is connected to the input of the launch of the control unit, and the output of the block for separating the leading edges of the information pulses and the output of the delay element to the duration The information pulse is connected to the "Recording and" erasing the information extraction block, respectively, and at the peripheral station of the system, the receiver output is connected via the block of the falling edges of the information pulses and via the serially connected block of the leading edges of the information pulses and the key to the inputs of the "erase and" recording the information extraction block, and the output of the highlighting block of the leading edges of information pulses through the delay element for half the duration The memory pulse is connected to the start of the control unit, the output of which is connected to the control input of the key. Sources of information taken into consideration in the examination 1. US Patent No. 3529243, cl. 325-55, published. 1970 (prototype). phage 2