SU501486A1 - Adaptive line of discrete information transmission at optimal frequencies - Google Patents

Description

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The invention relates to radio communication systems for transmitting discrete information in adaptive lines at optimal frequencies operating in tropospheric and shortwave communication channels.

A known adaptive transmission line of discrete information at optimal frequencies, containing transmissions of transmissions associated with the manipulator of n-fold relative phase telegraphy (OFT), while other inputs of transmissions of transmission are connected to the control unit of the amount of information transmitted, the inputs of which are connected to the decoder switching commands and, at the reception, a channel state measuring unit connected to the control node connected to the receiving accumulators, while the other inputs of the receiving accumulators are connected to the outputs of the demodulator of the multiple OFT, and the outputs of the receiving drives are connected with the information consumers, and the decision block connected to the encoder of the switching commands.

The aim of the invention is to increase the reliability of information transmission and simplify implementation while increasing the amount of information transmitted.

This is achieved by the fact that in the proposed transmission line the transmission accumulators are connected to the outputs of information sources directly, and at the reception a power potential measuring unit and a channel gain derivative sign determining unit are connected to the probe extractor, control node and selection node optimal frequency, with each of the outputs of the probe-signal extractor connect to the corresponding node to determine the sign of the derivative of the transmission coefficient; a, associated with the trigger of the HOAiepa memory channel with a positive derivative, with the second inputs of the mentioned triggers

connected to the node of control signals, and the outputs - to the inputs of the decision block, to the other inputs of which the outputs of the node of the choice of the optimal frequency are connected, as well as the triggers of memorizing the channel number

with an excess of energy potential, the inputs of which are connected to the circuits of the following thresholds, associated with the receiver's AGC output and with the awful outputs of the probe isolator, as well as with the control signal node, the outputs of the decision blocks are connected to an adder connected to the inputs the encoder of the switching commands, in addition, the outputs of the decision blocks are connected to the control node connected to the receiving accumulators.

The drawing shows a block diagram of the proposed adaptive transmission line.

The block diagram includes information source outputs 1, transmission drives 2, control node 3 of the amount of information transmitted, outputs of the decoders of switching commands 4, outputs of drives to the manipulator — once-OFT 5, output AGC of the receiver 6, outputs of the separator probe signals 7 of the adaptive line, outputs the control signal node 8, the outputs of the node for selecting the optimal frequency 9 of the adaptive line, the outputs of the demodulator of the multiple OFT 10, the node 11 for determining the sign of the derivative of the transmission coefficient of the channel, the trigger for storing 12 channel numbers from the field a derivative, a decision block 13, an adder 14, a threshold threshold circuit 15, a memory trigger 16 for a channel number with an excess of energy potential, a control node 17 for reception accumulators, 18 accumulators for receiving station, an output for information consumers 19, an output the encoder of the switching commands 20, the unit for determining 21 the sign of the derivative of the channel transfer coefficient, the measuring unit 22 of the energy potential margin.

In accordance with the drawing at the transmitting station, information sources 1 are connected to storage devices 2 connected to control unit 3 by the amount of information transmitted. In this case, the control unit 3 is connected with the decoder of the switching commands 4, and the information storage devices 2 are connected to the corresponding inputs of the manipulator of the multiple OFT b.

At the receiving station, the outputs of the probing signal separator 7 are connected to the nodes 11 for determining the sign of the derivative of the channel transfer coefficient, the outputs of which are connected to memory trigger 12 of the channel number with a positive derivative. The other inputs of the triggering memories 12 are connected to the control signal node 8, and the outputs of these triggers are connected to decision block 13. In addition, the outputs of the transmitter of the probe signals 7 are connected to the following threshold circuit 15, which other inputs are connected to the output AGC receiver. The outputs of the threshold threshold circuits 15 are connected to memory channel triggers 16, which are also connected to the control signal node 8. The outputs of the trigger 16 are connected to decision blocks 13, the other inputs of which are connected to the outputs of the optimum frequency selector node 9. These solutions 13 are connected to an adder 14 connected to the input of the encoder of the switching commands 20. In addition, the outputs of the decision block 13 are connected to the control unit 17 connected to the receiving accumulators 18. The signal inputs of the receiving accumulators 18 are connected us with outputs demodulator -fold OFT 10, the outputs nako.piteley 18 connected to the information consumer 19 m.

The device works as follows. At the transmitting station, information sources 1 are connected to transmission accumulators 2, which are controlled by signals from control unit 3 by the amount of information transmitted. But to signals from command decoders 4 control node 3 volume

the transmitted information connects a different number of drives 2 connected to the manipulator of the multiple OFT. The use of rt-multiplet OFT allows you to change the amount of information transmitted without rebuilding the main nodes of the adaptive line.

At the receiving station, the proposed device uses probe pulses in the adaptive line to determine at each probing frequency the sign of the derivative of the channel transfer coefficient and the power potential reserve. The measurement of the Derivative sign is based on the use of a PEAK voltmeter, which remembers the amplitude of the probing signal received in the previous probing period.

With an increase in the amplitude of the probing signal, the charge current of the capacitor of the peak voltmeter passes. This current is used to generate a pulse that triggers

triggers, memorizing numbers with increasing amplitude, i.e. with a positive derivative. Simultaneously with the determination of the sign of the derivative, the signal level is measured at each sounding frequency.

For this, the probe pulses from the selector 7 of the adaptive line are fed to the circuits 15, and the threshold level of these circuits depends on the AGC voltage of the receiver 6. If the probe pulse exceeds the set threshold, it indicates the power potential reserve at the measured frequency.

An impulse that exceeds the threshold triggers a trigger to memorize channel number 16 with an excess of energy potential. Signals from node 8 reset the triggers 12 and 16 after each measurement cycle. The outputs of the flip-flops 12 and 16 are connected to the channel blocks to make a decision 13,

the other inputs of which receive signals from the optimum frequency selection node 9 that is available in the adaptive line. Moreover, if it is determined at the selected optimal frequency that the channel transmission coefficient increases

(derivative is positive) and there is a reserve of energy potential (threshold level is exceeded), then decision block 13 generates a signal arriving at the transmit encoder 20 in the reverse direction of the command to increase the amount of information transmitted.

In addition, information on the change in the amount of information goes to the control unit 17 of the receive accumulators, which at the appropriate time points connects the accumulators 18 to the outputs of the de-modulators of the multiple-fold OFT.

The proposed device does not require transcoding of information and introduction of redundancy, which greatly simplifies this device in comparison with the prototype.

In addition, in the proposed device, the decision to increase the amount of information transmitted is based on the predicted increase in the channel gain, which eliminates a decrease in the reliability of information during the transfer of a command in reverse control.

Claims (1)

Invention Formula An adaptive transmission line of discrete information at optimal frequencies, containing transmissions of transmissions associated with the manipulator of m-fold relative phase telegraphy (OFT), while the other inputs of the transmission accumulators are connected to the control unit of the amount of information transmitted, the inputs of which are connected to the switch decoder commands, and on reception, a channel state measurement unit associated with the control unit connected to the m-receiver accumulators, while the other inputs of the reception accumulators are connected to the outputs The modulator of the multiple-fold OFT, and the outputs of the receiving drives are connected to the information consumers, and the decision block connected to the encoder of switching commands, characterized in that, in order to increase the reliability of information transmission and simplify the implementation while increasing the amount of data transmitted information, the transmission drives are connected to the outputs of the information sources directly, and at the reception a power potential measuring unit and a transmission coefficient derivative are detected An analog channel associated with a probe extractor, a control signal node, and an optimum frequency selection node, each of the outputs of the probe signal extractor connected to a corresponding node for determining the sign of the derivative of the channel gain derivative associated with the trigger of storing the channel number with a positive derivative, the second inputs of the above-mentioned triggers are connected to the node of control signals, and the outputs are connected to the inputs of decision blocks, to the other inputs of which are connected the outputs of the selection node frequency, as well as triggers of memorizing the channel number with an excess of energy potential, whose inputs are connected to 5 diagrams of the following thresholds associated with the receiver's AGC output and with the mentioned outputs of the probe signal isolator, as well as with the control signal node, the outputs of the decoupling units connected to the adder connected to the encoder inputs of the switching commands, moreover, the outputs The Solver Units are connected to a control node connected to the reception accumulators.