SU930720A1 - Descrete information transmitting device - Google Patents

Description

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  The invention relates to communication technology and can be used in radio links for transmitting discrete information, the modulating signal of which is a pseudo-random sequence,

A device for transmitting discrete information is known, comprising a series-connected carrier frequency generator, a clock frequency generator, a phase manipulator and a multiplier, another input of which is connected via a switch to the outputs of a pseudo-random sequence generator whose input is connected to another output of a clock generator.

However, the known device has a low reliability of information transfer. ,

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

The goal is achieved by the CCD in the device for transmitting disk information containing successively connected carrier frequency generator, clock frequency generator, phase manipulator and multiplier, the other input of which through a switch is connected to the outputs of a pseudo-random sequence generator whose input is connected to another the output of the clock generator, entered modulo

10 two, the output of which is connected to the auxiliary input of the switch, the input of which is connected to the output of the phase manipulator, while the inputs of the modulo two are

ts inputs of the first and second sources of information

: In the drawing a structural electrical circuit of the device is given.

A device for transmitting discrete information contains on the transmitting side a carrier frequency generator 1, a clock frequency generator 2, a phase manipulator 3, a multiplier

, pseudo-random sequence generator (PSP), switch 6, adder 7, modulo two, on the receiving side - multipliers 8 and 9 synchronization unit 10, generator 11 pseudo-random sequence (PSP) J, summing unit 12, subtracting unit 13, channels N 15 processing , each of which consists of a phase detector 16 and, 17, integrators 18 and 19, threshold blocks 20 and 21.

The device works as follows.

The first and second sources of discrete information produce an information sequence of opposite-polarity pulses, the duration of which is equal to the duration of the period of the pseudo-random sequence formed by the generator 5 SRP under the action of the clock frequency.

The information sequence of the first source modulates in phase on t 4- in the phase manipulator 3 the carrier frequency of serially connected generator 1 of the carrier frequency and generator 2 of the clock frequency. In addition, the information sequence of the first source, together with the information sequence of the second source, goes to adder 7 modulo two. The switch 6, under the action of the information sequence from the input of the adder 7 modulo two, connects to the multiplier 4 the corresponding output of the generator 5 SRP, i.e. modulates memory bandwidth bandwidth. In the multiplier 4, the phase-shifted signal is modulated on the delay bandwidth modulated.

Thus, a wideband phase-manipulated sigal with inverse modulation of the carrier frequency information from the first source and the SRP on the delay by the logical sum of the information sequences of the first and second sources arrive at the input of the receiver.

On the receiving side, the input signal is fed to the multipliers 8 and 9, the reference voltages are reduced from the corresponding outputs of the SRP generators 11, which is maintained in synchronism with the incoming signal by the synchronization unit 10, the input is connected to the input of the receiving device. The signals at the outputs of multipliers 8 and 9 are presented as three-level pulse sequences, where the presence of a positive pulse corresponds to the presence of a sinusoidal oscillation with a single phase, the presence of a negative pulse corresponds to the presence of a sinusoidal oscillation with an opposite phase and the absence of a pulse corresponding to the absence of a signal.

The signals from the output of the multipliers 8 and 9 are fed to the summing 12 and subtracting 13 blocks. From the output of the summing unit 12, the signal is received

5 to the channel 14 of processing the discrete information of the first source, containing a series-connected phase detector 16, an integrator 18 and a threshold unit 20, the output of which is

output of discrete information of the first source.

From the output of the subtracting unit 13, the si-nal enters the analogous information processing channel 15 of the second source, which contains the phase detector 17 connected in series, the integrator 19 and the threshold unit 21, the output of which is the output of the second-source discrete information. As a reference signal for the phase detectors 16 and 17, the output of the carrier frequency of the synchronization unit 10 is used.

Since the channels for processing discrete information from the first and second sources are the same, they implement the principle of coherent reception, do not have mutual influence on reception, the accuracy of receiving information from sources is the same.

In addition, equalization of the reliability of information transmission allows to improve such indicators of a radio link as the specific energy consumption and bandwidth per transmission of a single binary symbol.

Claims (1)

Invention Formula A device for the transmission of discrete information containing serially connected carrier frequency generator, clock frequency generator, phase manipulator and multiplier, another input of which through a switch is connected to the outputs of a pseudo-random sequence generator (SRP), whose input is