SU1160576A1 - Multichannel data transmission-reception device - Google Patents

Description

The invention relates to radio engineering and communications, in particular to multi-channel data transmission systems, and can be used in data transceiver systems from remote subscriber units via telephone communication channels.

The aim of the invention is to improve the accuracy of addressing.

The drawing shows a structural electrical diagram of a multichannel data transceiver device.

The device contains a transmitting distributor of signals 1, a generator of 2 clock signals, a generator of 3 clock pulses, the first adder 4 modulo two, a key 5, a phase-started signal generator 6, a first generator of a 7 pseudo-random signal, a transmitter 8, a receiver 9, a threshold element 10, a phase discriminator II, adjustable clock generator 12 clock pulses, generator 13, receiver 14 of phase-start signals, second pseudo-random signal generator 15, second modulator 16 modulo-two, receiving signal distributor 17 and pr unit 18 verok.

Multichannel device for transmitting signals works as follows.

Information signals are transmitted through the transmitting distributor 1 alternately from each individual channel with a discrimination frequency to the group channel through the first adder 4 and transmitter 8. The operation of the transmitting distributor 3 and transmitter 8 is provided by a generator 3 connected to the transmitting distributor 1.

The transmitting distributor 1 generates a sequence of pulses of sampling frequencies, the number of which is equal to the number of subscriber (individual) channels and the phase of which is shifted relative to one another by a constant value. The temporal positions of a sequence of pulses of sampling frequencies are such that when combined into one common signal, they form a common sequence of pulses of the group frequency, in which there are no pulses at temporary positions reserved for transmitting a sequence of synchronizing signals. Synchronization signals are transmitted through the transmitting distributor 1 to the group channel of the generator 2, which generates binary signs “O” as synchronizing (control) signals. The group signal from the output of the transmitting distributor 1 enters. the first adder 4, where it is added to the binary characters of the pseudo-random sequence generated by the generator <7, and through the key 5, which is in the initial state, goes to the transmitter 8. To the other input of the key 5, the synchronizing sequence of binary characters (phase start) produced by the generator 6 From the transmitter output 8, the group signal is transmitted via a connecting line to the receiving part of the opposite station of the system.

The signal transmitted through the connecting line enters through the receiver 9, the threshold element 10, the regenerator 13 and the second adder 16 to the receiving distributor 17, which distributes the received information through individual channels.

The signal from the line enters the receiver 9, from the output of which, corrected and amplified, is fed to the threshold element 10, which forms rectangular pulses from it; corresponding to the transmitted channel group signals. From the threshold element 10, the pulses arrive at the clock frequency phasing scheme, which includes the phase discriminator 11 and the adjustable oscillator 12, and the regenerator 13. The regenerated pulses are distributed on individual channels by the receiving distributor 17, the distribution will be correct if the receiving distributor 17 operates synchronously with. transmission distributor 1, and not the right one - otherwise.

To ensure synchronous operation of the transmitting and receiving valves, cyclic synchronization of the system is performed. It is provided by transmitting and receiving a synchronizing combination of binary Characters of a certain structure and length (phase start), at the end of which it is transmitted or received

start (phase) of the system.

At the time of establishing communication between two stations of the multichannel system, the desynchronization signal of the synchronization unit 18 sends a signal to the input of generator 6, after which key element 5 connects the output of generator 6 to transmitter 8 and generator 6 generates a synchronous sequence of binary characters (phase-start combination). Through the key element 5, the phase start combination is transmitted to the communication channel to the opposite station. At the end of the transmission to the channel of the synchronization combination, the generator 6 phases (sets) the transmitting distributor 1, the first generator 7 and the key element 5. The phase-start combination formed on the transmission enters the input of the receiver 14, which recognizes the symbols of the phase-start combination among the received binary signs . Upon receipt of a certain number of undistorted characters of the phase-start combination reception 1160576

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Nick 14 begins to independently generate binary signs that are identical with the receiving signs of the phase-start combination (in the absence of distortions in the group channel), and consequently, with the 6 combination signs generated by the generator. When transmitting in the channel and at the same time forming by the receiver 14 a phase start of the last digit of the phase start combination, the generator 6 and the phase start receiver 14 produce signals that the transmitter and receiver valves 1 and 17 and the first and second generators 7 and 16 respectively phase out. system.

After the termination of the frame synchronization, the first and second generators 7 and 16 generate with each clock of the frequency of the group channel the same binary signs of the pseudo-random sequence. On transmission, the characters of a pseudo-random sequence are added modulo two in the first adder 4 with binary signs of the group channel, forming a sequence of total characters. Total

the signs, adding together modulo two with the characters of the pseudo-random sequence of the second generator 16, form a sequence of binary signs of the group Channel, which were transmitted from the output of the transmitting distributor 1.

In the event of a system alignment violation, the transmitting and receiving valves 1 and 7, as well as the first and second generators 7 and 16, do not operate in phase, and a random sequence is fed from the output of the adder 15 to the input of the receiving valve 17, the characters of which are distributed on individual channels, including The number and the synchronization channel, arriving at the input of the block. The synchronization unit 18, by the specified criterion, determines that not a control sequence of characters “0” (in the case of synchronous operation of the system), but a random sequence of characters (when the system is out of synchronization) arrives at its input, and outputs to the input of the generator 6 a signal that is cyclic system synchronization.

Claims (1)

A MULTI-CHANNEL RADIO TRANSMISSION DEVICE, containing a transmitting signal distributor, the clock and synchronization inputs of which are connected to the outputs of the clock generator and the clock generator, a transmitter, a receiver, the output of which is connected to a circuit from a series-connected threshold element, phase discriminator, and tunable clock pulse generator. the regenerator, the second input of which is connected to the output of the threshold element, as well as the receiving valve with latter is present, a clock input of which is combined with a second input of the phase discriminator and connected to the output of the clock being adjusted, characterized in that, with In order to improve the accuracy of addressing, the sequentially connected phase-started signal generator, the first pseudo-random signal generator, the first modulo-two adder and the key, whose control input is connected to the second output of the phase-start signal generator, the first output of which is connected to the transmission enable input of the transmitting signal distributor, are entered, the output of which is connected to the second input of the first modulo-two adder, and the output of the key is connected to the input of the transmitter, and a block of checks and a sequence are entered atelno connected phase start signal receiver, the second pseudo-random _with signal and a second adder for modulo two, 5B, whose output is connected to the input of the receiver distributor signals, an auxiliary output of which via the unit checks connected to input of the phase start signal, a second input of the second adder modulo two and the receiver input of the phase start signals are combined and connected to the output of the regenerator, the output of the adjustable clock pulse generator is connected to the clock input of the receiver signal in phase start, the output of which is connected to the clock input of the receiving signal distributor. δ and „„ 1160576 > 1160576 one