RU2773265C2 - Dual phase modulation signal generator - Google Patents

Abstract

FIELD: telecommunication; digital radio communication.

SUBSTANCE: invention can be used in phase-shift keyed signal transmission systems. Technical result is achieved by the fact that in the device for generating signals of double phase modulation to the inputs of the key device, respectively, signals from the source of the carrier harmonic oscillation are supplied (Fig. 2 U(t)), frequency of which is lower than oscillation frequency of the high-frequency oscillation generator, directly and through a phase changer, and a binary message source is connected to the control input of the key device (Fig. 2, the signal C(t)). At the output of the key device a phase-shift keying signal is generated, in which the duration of one oscillation period of the carrier harmonic oscillation source is equal to the duration of the information symbol of the binary message source. Generated signal (Fig. 2, the signal Z(t)) is transmitted to the control input of the phase modulator, to the high-frequency input of which a high-frequency oscillation generator is connected (Fig. 2, the signal V(t)), and the output of the phase modulator (Fig. 2 signal S(t)) is the output of the device.

EFFECT: formation of phase-shift keyed radio signals with smooth phase change on duration of information transmission, due to double phase modulation.

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Description

The invention relates to telecommunications, namely to digital radio communications, and can be used in signal transmission systems with phase shift keying.

Known "Device for the formation of a complex phase-shift keying signal" (RF Patent No. 2265962, IPC: H04L 27/18, publ. 10.12.2005 Bull. No. 34).

The known device contains a carrier oscillation generator, the output of which is connected to the signal input of the first key and to the input of the first phase shifter, the output of which is connected to the signal input of the second key, the outputs of the first and second keys are connected to the corresponding inputs of the adder, the output of which is connected through a multiplier to the output of the device, a pseudo-random sequence generator (PRS), the clock input of which is connected to the output of the clock pulse generator, and the synchronization input is connected to the output of the clock generator and to the second input of the synchronizer, the first input of which is the input of the information signal, and the output is connected to the second input of the multiplier, while, it includes a switching unit, M decoders, M-2 keys, the outputs of which are connected to the corresponding inputs of the adder, M-2 phase shifters, a PSP delay block, the signal input of which is connected to the PSP generator output, the synchronization input of which is connected to the installation input of the PSP delay block , the clock input of the PSS generator is connected to the input of clock pulses of the PSS delay block, 2log2M direct and inverse outputs of which are connected to the corresponding inputs of the switching unit, Mlog2M outputs of which are connected to the corresponding log2M inputs of each of the M decoders, the outputs of which are connected to the control inputs of the corresponding M switches, signal the inputs of the third, ... M-th keys are connected to the corresponding outputs of the second (M-1)-th phase shifters, and the inputs of all (M-1) phase shifters are combined and connected to the output of the carrier oscillation generator.

A disadvantage of the known device is a relatively high level of out-of-band radiation during the transmission of signals generated on its basis, which is due to the discrete value of their phase change.

Known "Device for the formation of phase-shift keyed signal with a smooth phase change between the elementary pulses". (Patent of the Russian Federation No. 2631899, IPC: H04L 27/18, published on September 29, 2017, Bull. No. 28).

The device contains a clock generator, a multi-tap delay line, an adder, a delay line for a duration less than the duration of an elementary pulse, a triangular pulse generator, a high-frequency LC generator, and the generator output is connected to the input of the delay line, the output of which is connected to the input of the multi-tap delay line, the third, the fifth and sixth outputs of which are connected respectively to the third, fifth and sixth inputs of the adder, the output of which is connected to the input of the triangular pulse generator, connected by the output to the control input, in the presence of a constant bias voltage, a high-frequency LC generator, the output of which is also the output of the device .

The disadvantage of the known device is the limited scope of its application, tk. it is focused only on the formation of a phase-shift keyed signal with a seven-element Barker code.

The closest in technical essence to the proposed device is the device presented in the description of the patent "Method for generating signals with quadrature phase modulation" (RF Patent No. 2205518, IPC: H04L 27/20, publ. 27.05.2003 Bull. No. 15).

The prototype device contains a source of carrier harmonic oscillations (INGK) 1; first 2.1 and second 2.2 message sources (IS), first 7.1 and second 7.2 phase manipulators (PM), first 6.1 and second 6.2 phase shifters (PV), first 8.1 and second 8.2 balanced modulators (BM), adder 9, frequency divider (DF ) 10, the first 11.1 and second 11.2 synchronizers. Moreover, the output of INGK 1 is connected to the first input of the first 7.1 FM, the inputs of the first 6.1 FV and DCH 10, and the output of the DC 10 is connected to the input of the second 6.2 FV, the first input of the first 11.1 synchronizer and the first input of the first 8.1 BM, the second input of the first 11.1 synchronizer is connected with the output of the first 2.1 IS, and the output of the first synchronizer 11.1 is connected to the second input of the first 7.1 FM, the output of which is connected to the second input of the first 8.1 BM, the output of which is connected to the first input of the adder 9, the output of the second 2.2 IC is connected to the first input of the second 11.2 synchronizer, the output of the second 6.2 FV is connected to the second input of the second 11.2 synchronizer and to the first input of the second 8.2 BM, the output of the first 6.1 FV is connected to the first input of the second 7.2 FM, the second input of which is connected to the output of the second 11.2 synchronizer, and the output of the second 7.2 FM is connected to the second input second 8.2 BM, the output of which is connected to the second input of the adder 9.

Manipulation of in-phase and quadrature oscillations in phase by 180° shifted relative to one another by half the duration of the symbol by manipulating sequences of binary video signals is performed using the first and second phase manipulators. Balance modulation of in-phase and quadrature binary-keyed oscillations by 90° shifted relative to each other in phase by in-phase and quadrature harmonic signals with a frequency equal to half the symbol repetition rate, so that the envelopes of the received oscillations are equal to zero at the beginning and end of each symbol, is performed using first and second balanced modulators. The received oscillations are summed up using an adder.

The disadvantage of the prototype is the bulky design of the device.

The objective of the invention is to reduce the weight and size of the device.

The technical result consists in simplifying the design while maintaining the possibility of generating phase-shift keyed radio signals with a smooth phase change for the duration of the information package.

The technical result is achieved by the fact that a key device, a phase modulator and a high-frequency oscillation generator are introduced into the device for generating a signal of double phase modulation, containing a source of a carrier harmonic oscillation, a source of messages, a phase shifter, and the output of the source of the carrier harmonic oscillation is connected to the first input of the key device and the input phase shifter, the output of which is connected to the second input of the key device, to the control input of which the message source is connected, the output of the key device is connected to the control input of the phase modulator, the high-frequency input of which is connected to the high-frequency oscillation generator, and the output of the phase modulator is the output of the device.

Due to the introduction of new blocks and connections, a low-frequency oscillation is formed, the phase of which is modulated by an information discrete signal, and the phase of the high-frequency oscillation is modulated by the obtained low-frequency phase-shift keyed signal, which allows to achieve a technical result.

The essence of the invention is illustrated by drawings, where

in fig. 1 shows a block diagram of the proposed device;

in fig. 2 - stress diagrams;

in fig. 3 is a block diagram of the prototype device and the following designations are introduced:

1 - source of carrier harmonic oscillation (INGK);

2 - message source (IS);

3 - key device (KU);

4 - phase modulator;

5 - high-frequency oscillation generator (GVK);

6 - phase shifter (PV).

The device (see Fig. 1) contains INGK 1, connected in series IS 2, KU 3 and phase modulator 4, to the second input of which is connected GVK 5, the output of INGK 1 is connected to the second input of KU 3 and to the input of FV 6, the output of which is connected to the third input KU 3, and the output of the phase modulator 4 is the output of the device.

The implementation and operation of the block source of the carrier harmonic oscillation 1, the source of messages 2 and the phase shifter 6 are considered in [1]; the implementation and operation of the high-frequency oscillation generator 5 is considered in [2]; the implementation and operation of the key device 3 is considered in [3]; the implementation and operation of the phase modulator 4 is considered in [4].

The device works as follows:

The information signal C(t) in the form of a pulse sequence (see Fig. 2) from the output of the IS block 2 is fed to the first input of the block KU 3. harmonic oscillation U(t) (see Fig. 2). And the third input of the block KU 3 comes from the output of the block FV 6 inverted by 180° harmonic oscillation U(t). As a result, a low-frequency phase-shift keyed signal Z(t) is supplied from the output of the KU 3 block to the first input of the phase modulator 4 (see Fig. 2), and a high-frequency oscillation V(t) is supplied to the second input of the phase modulator 4 from the output of the GVK 5 (see Fig. 2). In this case, the output of the phase modulator 4 outputs the resulting signal of double phase modulation S(t) (see Fig. 2), with a smooth phase change over the duration of the information message.

The duration of the information message is determined by the minimum duration of the signal pulse C(t). In this case, if the positive pulse of the signal C(t) acts as a logical "1", then the negative pulse of the signal C(t) acts as a logical "0", or vice versa.

Thus, in the claimed device, the weight and size indicators are much smaller than those of the prototype, and due to double phase modulation, the possibility of forming phase-shift keyed radio signals with a smooth phase change over the duration of the information package has been preserved, which indicates the achievement of the claimed technical result.

List of sources used

1. Patent of the Russian Federation No. 2439819, dated 11/24/2010, H04L 7/02, Published: 01/10/2012 Bull. No. 1.

2. Patent of the Russian Federation No. 2602598, dated September 14, 2015, N04K 1/02, Published: November 20, 2016 Bull. No. 32.

3. Patent of the Russian Federation No. 2550358, dated 05/05/2014, H04L 27/18, Published: 05/10/2015 Bull. No. 13.

4. Author's certificate of the USSR No. 70171, dated 12/18/1946, H03L 1/00, Published: 01/31/1948.

Claims (1)

A device for generating a signal of double phase modulation, containing a source of a carrier harmonic oscillation, a message source, a phase shifter, characterized in that it additionally includes a key device, a phase modulator and a high-frequency oscillation generator, an output of a source of a carrier harmonic oscillation, the frequency of which is lower than the oscillation frequency of the high-frequency oscillation generator , connected to the first input of the key device and the input of the phase shifter, the output of which is connected to the second input of the key device, to the control input of which the source of the binary message is connected, the output of the key device, on which the phase-shift keying signal is generated, with the duration of one oscillation period of the source of the carrier harmonic oscillation is equal to the duration of the information symbol of the source of the binary message, is connected to the control input of the phase modulator, to the high-frequency input of which the high-frequency oscillation generator is connected, and in the output of the phase modulator is the output of the device.

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