RU2013014C1 - Device for transmission and reception of information with use of linear-frequency-modulated signals - Google Patents

Abstract

FIELD: radio engineering, discrete information transmission. SUBSTANCE: device has transmitting side NOT gate, first and second pulse formers, first and second forming LFM filters, adder, transmitter, code converter, multiplier and on receiving side first and second matched LFM filters, first and second envelope detectors, comparator, first and second adders, first and second time-gating units, clock synchronizer, first and second pulse expansion units, linear path, receiver, delay line, multiplier, low-pass filter. Additional stage of modulation - relative phase modulation which helps to form continuous LFM signal phase-keyed by information message from second source is inserted on transmitting side. EFFECT: increased volume of transmitted information. 3 dwg

Description

 The invention relates to radio engineering and can be used in radio systems for transmitting discrete information.

 The goal is to increase the amount of information transmitted.

 In FIG. 1 shows a structural electrical diagram of a device; in FIG. 2,3 - time diagrams of his work.

 The device contains on the transmitting side the element HE1, the first and second elements And 2,3, the first and second drivers 4.5 pulses, the first and second shaping LFM filters 6,7, adder 8, transmitter 9, code converter 10, multiplier 11, on the receiving side, the first matched LFM filter 12, the first and second detectors 13.14, the envelope, the comparator 15, the first adder 16, the first time gating block 17, the clock synchronizer 18, the first pulse expansion unit 19, the receiver linear path 20, the second matched LFM filter 21, second adder 22, a low-pass filter 25, a second side 26 temporary gating, a second pulse expansion unit 27, as well as a delay line 23 and a multiplier 24.

 The device operates as follows.

 The first input of the device receives an information signal from one source of discrete information, and the second input from another source. When transmitting a logical unit from the first source of information, the first generating LFM filter 6 generates a signal with increasing LFM, and when transmitting a logical zero from the first source of information, the second generating LFM filter 7 generates a signal with decreasing LFM. The signals from the outputs of the forming LFM filters 6 and 7 are summed in the adder 8 and converted into a continuous LFM signal.

 An information signal from another source of discrete information is fed to the first input of the code converter 20 (Fig. 3, t. 2), the second input of which receives clock pulses (Fig. 3, t. 1). Code converter 10 converts the direct code of the second source of discrete information into relative (Fig. 3, t. 3). The generated signal with relative coding is fed to the input of the multiplier 11, and a continuous LFM signal is supplied to the other input of the multiplier 11 (Fig. 3, t. 4). As a result, the phase-manipulated LFM signal is generated at the output of the first multiplier 11 (Fig. 3, t. 5).

 On the receiving side, demodulation of the transmitted information signals is carried out. The selection of the information signal from the first source of discrete information is as follows. The input signal of the demodulator contains signals with increasing LFM and with decreasing (Fig. 2 t. 1), The first 12 matched LFM filter compresses the signal with increasing LFM (Fig. 2, t. 2), which corresponds to the symbol "unit "the transmitted information, and the second matched LFM filter 21 processes the signal with decreasing LFM (Fig. 2, t. 3), which corresponds to the symbol" zero "of the transmitted information. The signals with the output of the LFM filters are fed to the inputs of the first 13 and second 14 envelope detectors, respectively, at the outputs of which signals are generated (Fig. 2, t. 4,5), which give an estimate of the temporal position of the pulses of the corresponding input information. The signal from the output of the comparator 15, which under the influence of interference has the form of FIG. 2, t; 6 is gated by pulses from the clock synchronizer 18, which is triggered by the output signal of the adder 16 (Fig. 2, t. 7). Short pulses from the output of the temporary gating block 17 (Fig. 2, t. 8) to the input of the pulse expansion block 19 are converted by this block into a signal corresponding to the transmitted information signal (Fig. 2, t. 9). And the selection of the information signal from the second source of discrete information is as follows. The signals from the outputs of the first 12 and second 21 matched LFM filters are fed to the corresponding inputs of the second adder 22. The multiplier 24, together with the delay line 23 and the low-pass filter 25, forms an autocorrelation signal demodulator with relative phase shift keying. At the output of the low-pass filter 25, short pulses are formed (Fig. 3, t. 6), from which then the second information source of the second source is restored by the second time gating unit 26 and the second pulse expansion unit 27 (Fig. 3, t. 7).

Claims (1)

 DEVICE FOR TRANSMITTING AND RECEIVING INFORMATION USING LFM SIGNALS, comprising on the transmitting side a first AND element, a first pulse generator and a first LFM filter, the output of which is connected to the first input of the adder, as well as a transmitter and a series-connected element NOT, the second the And element, the second pulse former and the second forming LFM filter, the output of which is connected to the second input of the adder, while the first input of the first And element is connected to the input of the element NOT and is the first input of the device, the second input of the first element And is connected to the second input of the second element And is the clock input of the device, and on the receiving side is the linear path of the receiver, the output of which is connected to the inputs of the first and second matched LFM filters, the outputs of which are respectively through the first and the second envelope detectors are connected to the first and second inputs of the comparator and the first adder, the outputs of which are connected respectively to the inputs of the first block of time gating and clock synchronizer, at the output of the temporary gating block is connected to the input of the first pulse expansion block, the clock synchronizer output is connected to the clock inputs of which and the first temporary gating block, the output of the first pulse expansion block being the first output of the device, characterized in that, in order to increase the amount of transmitted information, introduced on the transmitting side of the multiplier and code Converter, the first input of which is the second input of the device, the clock input of which is connected to the clock input at triplets, while the outputs of the adder and code converter are connected respectively to the first and second inputs of the multiplier, the output of which is connected to the input of the transmitter, and on the receiving side there is a delay line and series-connected second adder, multiplier, low-pass filter, second time gating block and second a pulse expansion unit, the output of the clock synchronizer is connected to the clock inputs of which and the second block of temporary gating, while the output of the second adder is connected via the delay line is connected to the second input of the multiplier, while the output of the second block of temporary gating is the second output of the device.

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