SU815934A2 - Device for transmitting discrete information with multiposition code - Google Patents

Description

(54) TRANSMISSION DEVICE

DISCRETE INFORMATION MULTIPOSITE code

The invention relates to telecommunications and can be used in the transmission of discrete information over short-wave communication channels. Mostly auth. St. No. 559410, a device for transmitting discrete information by a multi-position code, comprising a transcoding unit, a code generator, a distribution unit, phase handlers, a frequency grid generator, an output shaping unit, and an input amplifier, a synchronization unit, and correlation detectors on the receiving side. , a frequency grid generator, a storage unit, a phase difference calculation unit, a matched filter, a decision unit, and a serial code generator 1. However, in a known device there is no control l of erroneously received symbols in a codeword. The purpose of the invention is to provide control over the number of received characters in a code pattern. The goal is achieved by adding an additional serial code generator, a display unit and a serially connected amplitude limiter, a memory block and a comparison unit, the second input and output of which are connected to the output of the additional serial code and the input of the display unit, while the outputs of the decision block are connected to the inputs of the additional generator of the sequential code, and the output of the block calculating the phase difference is connected to the input of the amplitude limiter. The drawing shows a structural electrical circuit of the proposed device. A device for transmitting discrete information by a multi-position code contains on the transmitter side a transcoding unit 2, a distribution unit 3, phase handlers 4, a code generator 5, a frequency grid generator 6 and an output shaping unit 7, and on the receiving side 8 an input amplifier 9, unit 10 synchronization correlation detectors 11-13, phase difference calculation unit 14, storage unit 15, matched filter 16, decision unit 17, sequential code generator 18, additional sequential code generator 19, comparison unit 20 , memory unit 21, amplitude isolator 22, display unit 23 and frequency grid generator 24.

The device works as follows

The transcoding unit 2 converts the input signal into a relative parallel code and controls the operation of generator 5, which associates with each transmitted position the implementation of the orthogonal code controlling the operation of the distribution unit 3.

Distribution unit 3 controls the operation of phase handlers 4, depending on the implementation of the orthogonal code at its input. The output forming unit 7 combines the individual phasic lovers; The induced oscillations into a group signal, which is transmitted over the communication channel.

Thus, each implementation of an orthogonal code corresponds to its own implementation of a multi-frequency signal.

At receiver side 8, the phase difference between the corresponding spectral component of the received signal and the reference frequency supplied from the generator 24 is calculated using correlation detectors 11-13.

The voltages obtained during the processing of two adjacent premises are recorded in the storage unit 15. Relative decoding is performed using block 14. The output of block 14 is alternately connected to the inputs of matched filter 16.

The driving unit 17 controls the operation of the generator 18, from which output the information sequence is removed. The driving unit 17 also controls an additional generator 19, at the output of which one of the implementations of the orthogonal code appears, depending on the number

The OUTPUT bus of the decisive unit 17, on which the control voltage is applied. Block 14, through amplitude limiter 22, records in pulse block 21 a sequence of pulses, the sign of each of which corresponds to the phase difference between adjacent messages in the corresponding frequency subchannel calculated by block 14. Block 21 controls the operation of block 20 in such a way that pulses in its input occur each time when the signs of the signals at the outputs of the additional generator 19 and block 21 do not match. The additional generator 19, through block 20, controls the operation of block 23 in such a way that it counts the number of received symbols of the implementation of the orthogonal code.

Claims (1)

Apparatus of the Invention information multi-code software auth. St. No. 559410, characterized in that, in order to control the number of signal received symbols in a code combination, an additional sequential code generator, a display unit and a serially connected amplitude limiter, a memory unit and a comparison unit are introduced at the receiving side, the second input and output of which connected, respectively, to the output of the additional generator of the serial code and the input of the display unit, while the outputs of the decisive unit are connected to the inputs of the additional generator of the serial code And calculating block output phase difference is connected to the input of the amplitude limiter. Sources of information taken into account during the examination 1. USSR Author's Certificate No. 559410, cl. H 04 J 3/10, 1975 (prototype).