SU815953A1 - System for transmitting information by bipulse signal - Google Patents

Description

(54) DIGITAL INFORMATION TRANSMISSION SYSTEM BY THE IMPULSE SIGNAL.

one

The invention relates to a communication technique and can be used in digital information transmission systems, such as fiber optic lines, using bi-pulse signals.

A known system for transmitting digital information over an ontH4ecKOMy fiber by a bi-pulse signal, which on the transmitting side contains a BI signal generator of a pulse signal, the input of which is connected to the information source, and the output through the input node is connected to the input of the communication channel. At the receiving side, the communication channel is connected to the regenerator through the node of the transceiver, the outputs of which are connected to the decision node and the clock generator. The output of the clock generator is connected to the synchronization input of the decision node, the output of which is connected to the input of the information consumer 1.

The disadvantage of this system is the low throughput of the system; communication, and with an increase in the information transfer rate in the known system, the upper cutoff frequency increases. leads to a decrease in the maximum allowable distance between receptacles

points. This disadvantage ultimately reduces the technical and economic performance of the communication system.

The purpose of the invention is to improve the technical and economic indicators of the communication system by increasing the capacity / capacity. The goal is achieved by the fact that in a digital information transmission system a bi-pulse signal containing an information source, an input node, a communication channel and a node connected in series

The output 0, as well as the primary clock extractor and the information consumer, on the transmitting side, the information output of the information source is connected to the information input of the code base converter, the output signal of the information source clock is connected to the connected sequence. a code group clock generator and a secondary clock clock generator, the outputs of each of which are connected respectively to the synchronization input by groups and the clock inputs by the secondary cycles of the said code converter, the second and third positions of the code base converter are connected to the input

the second and the input of the third positioner of the three-position bi-pulse signal generator, the output of which is connected to the input of the input node, on the receiving side the output of the output node is connected to the input of the accumulator, the output of which is connected to the input of the decision node, the outputs of the first, second and third positions of which are connected to the inputs of the first, second, and third positions of the inverse converter of the code base, and to the input of the rectifier, the output of which is connected to the input of the secondary clock selector, the first input of the selector of the clock signal of code groups and c in the threshold former, the outputs of the positive and negative thresholds of which are connected respectively to the inputs of the positive and negative thresholds of the decision node, where the output of the code base inverter is connected to the information consumer input, the output of the secondary clock selector Hbiji is connected to the second input of the clock signal selector and the secondary clock input the decision node, the output of the code group sync selector is connected to the input of the primary clock selector and to the sync input by code groups of the inverse converter of the code base, and the output of the primary clock selector is connected to the input of the primary cycles of the inverse code base converter.

FIG. 1 shows a functional diagram of the information transmission system with a bi-pulse signal; Figs. 2 and 3 show signal timing diagrams in the transmitter and receiver parts of the system, respectively.

On the transmission side, the information output of the information source 1 is connected to the information input of the converter 2 of the code base. The output of the sync signal of the information source 1 is connected to the connected: the shaper 3 sync signals of code groups and the shaper 4 sync signals of the secondary clock cycles. The outputs of the second and third positions of the converter 2 base code are connected respectively to the inputs of the second and third positions of the shaper 5 three-position bi-pulse signal, the output of which through the input node 6 is connected to the input of the communication channel 7. In addition, the output of the generator 3 of the sync signal of code groups and the output of the generator of 4 of the sync signal of the secondary clock are connected respectively to the synchronization input in groups and the synchronization input of the secondary clock of the converter 2 base code.

At the receiving side, the output of the communication channel 7 through the output node 8 is connected to the input of the storage device 9, the output of which is through the rectifier. 10 is connected to the inputs of the selector 11 secondary cycles, the selector. 12 sync code groups as well

Former 13 thresholds. The output of the accumulator 9 is further connected to the input of the decision node 14, the outputs of the first, second and third positions of which are connected respectively to the inputs of the first, second and third positions of the base-code inverter 15 The output of the code base inverter 15 is connected to the input of the consumer 16 information. Next, the output of the allocator 11 secondary cycles connected to the input of the secondary cycles of decisive

node 14 and the second input of the selector 12 of the sync signal of code groups, the outputs of the positive and negative thresholds of the former 13 thresholds are connected to the inputs of the positive and negative thresholds

deciding node 14, - the output of the selectors 12 of the sync signal of the code groups is connected to the input of the selector 17 primary cycles and to the synchronization input of the inverter groups of the 15 code, and the output of the selector 17 primary cycles connected

to the input of the primary clock of the inverter 15 of the base code.

The device works as follows. The binary signal of the source of information 1 is fed to the input of the converter 2 of the base code (Fig. 2a), which divides the sequence of binary symbols received at its input into groups of three characters and encodes each such group with two symbols of the ternary signal. In this case, the second and third positions of the day off

The signal of the converter 2 base of the code corresponds to the presence of a pulse at one of its outputs, the first position of the output signal is characterized by the absence of a pulse at both outputs of the converter 2. Necessary for the operation of the converter

the invader 2 code bases clock pulses are generated from a sync signal from an information source (Fig. 26), a shaper 3 of a sync signal of code groups (Fig. 2 c) and a shaper 4 a sync signal of secondary clocks

(Fig. 2 g).

The output signals of the converter 2 base code are fed to the input of the shaper 5 three-position biopulse

5 signals. In this case, a bi-pulse signal is formed from each character of the second position of the output signal of the converter 2, for example, in the first half of the clock interval, there is a positive pulse and a negative pulse in its second half. A bi-pulse package with a reverse alternation of positive and negative pulses is formed from the symbol of the third position. The first position of the output signal of the converter-2 corresponds to the absence of voltage at the output of the driver 5 for the entire clock interval (Fig. 2 g). The output signal of the generator of the three-position bi-pulse signal through the input node 6.

enters communication channel 7. In this case, the input unit 6 performs all the necessary functions on the coordination of the transmitting device with the communication channel, as well as the correction of the characteristics of the communication channel.

At the receiving side, the signal from the output of the communication channel 7 (Fig. 3a) is fed through the output node 8 to the input of the accumulator 9, which performs the optimal filtering of the received bi-pulse three-position parcels. After optimal filtering, the received signal from the output of the accumulator (Fig. 36) 9 is fed to the input of rectifier 10 and to the input of the decision node 14. Rectifier 10 performs a nonlinear conversion of the signal. The converted signal is further fed to the selector of 11 secondary cycles, the selector of 12 clock signals of code groups and 13 thresholds to the input of the generator. Secondary clock pulses from the output of the allocator 11 secondary strokes are fed to the input of the secondary clock of the deciding node 14 and to the second input of the selector 12 of the code group synchronization signal (Fig. 3), which from the output signal of the rectifier 10 and the separator 11 of the secondary cycles generates pulses located at the boundaries code groups (Fig. Зж). The threshold shaper 13 generates two threshold voltages: positive and negative, which are applied to the inputs of the positive and negative thresholds of the decision node 14 (dotted lines in Fig. 36). The decisive node at the time of posting on its clock input of the secondary clock makes a decision about the position of the received parcel, with each position of the received signal corresponds to the presence of a pulse at one of the three outputs of the decision node 14 (Fig. 3 g, e and e). The output signals of the deciding node 14 are fed to the inputs of the first, second and third positions of the inverter 15 of the code base, which of each two symbols of the three-position code forms three symbols of the binary code (Fig. 3 and). The received binary signal from the output of the inverter 15 of the code base is fed to the information consumer 16. The pulses necessary for the operation of the inverter 15 of the base of the code, which follow the boundaries of the code groups, come from the selector 12 of the clock frequency of the code groups (Fig. 3g). From the sequence of the same pulses, a sequence of clock pulses, which follow the frequency of the primary binary signal (Fig. 3), are formed using the extractor 17 primary clock, which are fed to the input of the primary clock of the inverter 15 of the code base.

The invention allows, at a constant upper cutoff frequency of the communication channel, to increase the speed of information transfer by 1.5 times, while not reducing

the length of the re-reception area, which leads to an increase in the technical and economic indicators of the communication system.

Claims (1)

Invention Formula Digital Information Transmission System bi-pulse signal, containing a source of information, an input node connected in series, a communication channel and an output node, as well as a primary clock extractor and information consumer, characterized in that, in order to improve technical and economic indicators by increasing throughput, on the transmitting side the information source output is connected to the information input of the code base converter, the output signal of the information source clock signal is connected to the synchro generator connected in series the code group signal and the secondary clock driver, the outputs of each 0 of which are connected respectively to the synchronization input by groups and synchronization inputs by secondary cycles of said code converter, with the outputs of the second and third positions of the code base converter connected to the input 5 and the third input of the shaper of a three-position bi-pulse signal, the output of which is connected to the input of the input unit, and on the receiving side, the output of the output node is connected to the input of the storage device, the output of which is connected 0 with the input of the decision node, the outputs of the first, second and third positions of which are connected to the inputs of the first, second and third positions of the reverse converter of the code base, and with the input of the rectifier, the output 5 of which is connected to the input of the secondary clock selector, the first input of the selector of the sync signal of code groups and the input of the threshold generator, the outputs of which are positive and negative, are connected respectively to the inputs 0 positive and negative thresholds of the decision node, the output of the inverter code base converter is connected to the input of the information consumer, the output of the secondary clock selector is connected to the second input of the clock group clock and the input of the secondary clock of the decision node, the output of the code clock selector signal is connected to the input of the clock selector primary clock cycles and to the synchronization input by the code groups of the inverse Q base converter, and the output of the primary clock selector is connected to the primary input GOVERNMENTAL cycles inverse code converter base. Sources of information taken into account in the examination 5 1. Blackmore R. W and Fell P. N. Ubits OpTJcal Fiber System. First European Conferenceatv Optical Fiber Communication. London 1975, 8, p. 448. -UI74-I - / K. sh b g de f 3 W j (ъ ABOUT about ABOUT Fi. LAUT-L /