Transmission system the quaternary-coded radio signals

 

(57) Abstract:

The invention relates to communication and can be used in adaptive synchronous and asynchronous communication systems. Transmission system the Quaternary - coded radio signal contains a clock pulse shaper D-code, the Builder of the two signals is a multiple frequency-shift keying, the selector signal, the block allocation of additional sequences, two-channel coherent filter, myCitadel and a crucial block. Technical result achieved - the expansion of the scope through the use of the communication channels with random parameters, meter and decameter range of waves in systems with code multiplexing of signals and systems with multiple access. 2 C.p. f-crystals, 3 ill., table 1.

The invention relates to communication technology and can be used in adaptive synchronous and asynchronous communication systems as a system of discrete information transmission and synchronization, using the propagation of electromagnetic waves in communication channels with random parameters (phase, amplitude and polarization) meter and decameter range of waves.

Known systems (see, for example, the Patent of the Russian Federation 2014738, 1994 ions on Communications, vol. COM-27, No. 9, September 1979. p.1296-1301)).

Known first analog transmission system comprises a transmitting side, which contains the clock, driver source code, delay, multi-tap, shaper modulating information sequences, N modulators, the adder, connected through the communication channel with the reception side, which contains a coherent filter and a crucial block and uses to transmit the Quaternary-coded sequences of phase manipulation with four values of initial phase (FM-4).

The disadvantage of the first analog is the lack of application of phase manipulation in view of the uncertainty in the initial phase of the signal, and consequently, the inability to allocate additional sequences in the radio channel with random parameters (phase, amplitude and polarization) meter and decameter of wavelengths, which limits the area of application of this system.

The well-known second analog transmission system comprises a transmitting side, which contains the clock, driver D-codes, a phase modulator, a radio frequency generator, horizontal is, entry lower frequencies, consistent filter Welty, myCitadel, the deciding unit and uses to transmit the Quaternary-coded sequences relative phase manipulation.

The lack of the second analog is no possibility of using relative phase manipulation, as in the receiving part of the system are violated mutually correlation properties between the cyclic shifts of the Quaternary-coded sequence, which is unacceptable when used in systems with a code multiplexing of signals and systems, multiple access, which limits the area of application of this system.

The closest in technical essence and function to the requested system analogue (prototype) transmission system is the Quaternary-coded radio signals by A. S. USSR 1805550, IPC7N 04 14/00, Appl. 07.02.91, publ. 30.03.93. The known system comprises a transmitting part, consisting of a radio frequency generator, clock pulse shaper D-codes, the phase modulator and the polarization modulator, the communication channel, the receiving part comprising a polarization selector, consistent dual channel filter, myCitadel, a reference generator connected to a generator of clock pulses, driver D-codes, a phase modulator and a polarization modulator, a second input and the output of which is respectively connected to the generator output clock pulses and an output of the transmitting part of the system, the second input of the phase modulator coupled to the output of the frequency generator, the output of the transmitting part is connected through the communication channel to the input of the receiving part, which is also the entrance of the polarization selector, both outputs of which are connected to respective inputs of an agreed two-channel filter, the first and second outputs of which are connected to corresponding inputs of myCitadel, the output of which is connected with the second input of the multiplier, first the input and output of which are connected respectively with the output of the reference oscillator and the input of the lowpass filter, the output of which is connected to the input of the decision making unit whose output is the output of the receiving part.

Transmission system the Quaternary-coded radio signals prototype uses to transmit the Quaternary-coded sequences of phase manipulation with circular polarization, where the odd-numbered elements of the Quaternary-coded sequence is transmitted left-hand circular polarization, and even alariaceae determines the number of additional sequences in the Quaternary-coded radio signal.

The disadvantage of the prototype is the lack of application of phase manipulation of circular polarization in the radio channel with random parameters (phase, amplitude and polarization) meter and decameter of wavelengths, which limits the area of application of this system.

The aim of the invention is to develop a transmission system Quaternary-coded radio signals, providing extended field of application due to the use of the communication channels with random parameters (phase, amplitude and polarization) meter and decameter range of waves for systems with code multiplexing of signals and systems with multiple access.

To achieve a technical result in the transmission system the Quaternary-coded radio signal containing the transmission of the clock pulses, the output of which is connected to the shaper D-codes, the output of the transmitting part is connected through tract distribution to the entrance of the receiving part of the system, which includes myCitadel, the output of which is connected to a decisive block whose output is the output of the receiving part of the system, in addition to transmitting part of the system introduced shaper signals dvukratnoi pulses and shaper D-codes, the shaper's output signals of two frequency-shift keying is the output of the transmitting part of the system. The receiving part of the system inputs of the selector signal, the input of which is the input receiving part of the system, and the first, second, third and fourth outputs connected respectively to the first, second, third and fourth inputs of the block allocation of additional sequences, the first and second outputs of which are connected to first and second inputs dual channel matched filter, and first and second outputs of which are connected respectively to first and second inputs of myCitadel.

The selector signal consists of first, second, third and fourth bandpass filters whose inputs are combined and are input selector signals. The outputs of the first, second, third and fourth bandpass filters are respectively the first, second, third and fourth outputs of the selector signals.

Block allocation of additional sequence consists of the first, second, third and fourth amplitude detectors, the inputs of which are respectively the first, second, third and fourth inputs of the block allocation of additional members is which is connected to the output of the first inverter, the inlet of which is connected to the output of the second amplitude detector. The output of the third amplitude detector connected to the first input of the second adder, the second input is connected to the output of the second inverter, whose input is connected to the fourth output of the amplitude detector. The outputs of the first and second adders are respectively the first and second outputs forming unit additional sequences.

Thanks to the new essential features due to the introduction of driver signals of two frequency-shift keying, the selector signals and block allocation of additional sequences is the possibility of using two-frequency manipulation when transmitting the Quaternary-coded sequence. This provides the opportunity to expand the scope of the claimed system, in particular, in communication channels with random parameters (phase, amplitude and polarization) meter and decameter range will for systems with code multiplexing of signals and systems with multiple access.

The analysis of the level of technology has allowed to establish that the analogues, characterized by a set of signs, codes the nogo device condition of patentability "novelty". Search results known solutions in this and related areas of technology in order to identify characteristics that match the distinctive features of the prototype of the features of the declared object, showed that they do not follow explicitly from the prior art. The prior art also revealed no known effect provided the essential features of the claimed invention transformations on the achievement of the technical result. Therefore, the claimed invention meets the condition of patentability "inventive step".

The claimed invention is illustrated by the diagrams:

Fig.1 - structural diagram of the transmission system the Quaternary-coded radio signals;

Fig.2 is a block diagram of the selector signals;

Fig. 3 is a structural block circuit diagram of the allocation of additional sequences.

Transmission system the Quaternary-coded radio signals shown in Fig. 1, contains the transmit side clock 1, the output of which is connected to the imaging unit 2 D-code. The first and second inputs of the former (3 signals of two frequency-shift keying respectively connected to the outputs of the clock pulses 1 and driver 2 D-codes. The output of the transmitting part of the system is connected via path 4 distribution input receiving part of the system, which is also the input of the selector 5 signals. First, second, third and fourth outputs of the selector 5 signals connected respectively to the first, second, third and fourth inputs of the block 6 additional sequences. The first and second outputs of the block 6 additional sequences are connected to first and second inputs dual channel matched filter 7. The first and second outputs dual channel matched filter 7 connected respectively to first and second inputs of vicites 8. The output of vicites 8 is connected to the decisive unit 9 whose output is the output of the receiving part of the system.

Clock 1 is designed to generate pulses of a certain duration. It can be implemented as described in the book of L. M. Mikhail, Y. T. of Butyrskogo, M. H. Pole "Digital devices on integrated circuits in communication technology" (M.: Communication, 1979, S. 72-76, Fig. 3.14).

Shaper 2 D-code is designed to generate a code sequence (D-code) with period N = 2kwhere k2 is an integer. It can be implemented as described in A. C. the USSR 1177910, IPC6H 03 M 5/00, Appl. 18.04.84, publ. 07.09.85, A. C. the USSR 1805550, IPC6the oherent and Differentially Coherent PSK" (IEEE Transactions on Communications, vol. COM-27. N 9, September 1979, p.1296-1301, Fig. 1).

Shaper 3 signals of two frequency-shift keying is intended for the formation of the Quaternary-coded signal. It can be implemented as described in the book of N. L Joe E. N. Kudelin, O. P. linuk "non-linear electronic device. Part I" (M: Voenizdat. 1982, S. 342-344, Fig. 8.42).

Tract 4 distribution is used to distribute the Quaternary-coded signal. The basis of tract distribution is one or the other environment in which the signal propagates, for example, electrical connection is cable or waveguide, in communications systems - an area of space in which propagated electromagnetic wave.

The selector 5 signals shown in Fig.2, is intended for breeding Quaternary-coded signal and is composed of the first 5.11second 5.12third 5.13and fourth 5.14bandpass filters whose inputs are combined and are input selector 5 signals, and outputs the first 5.11second 5.12third 5.13and fourth 5.14bandpass filters are respectively the first, second, third and fourth outputs of the selector 5 signals. what a specific signal. They can be implemented as described in the book of U. the TIC, K. Schenk "Semiconductor circuit" (M.: Mir, 1982, S. 213-216, Fig.13.27).

Unit 6 additional sequences shown in Fig. 3, is designed to highlight the first additional sequence of the odd elements of the quadruple-encoded sequence (selection items) and the allocation of the second additional sequence of even-numbered elements of the quadruple-encoded sequence (selection items) and is composed of the first 6.11second 6.12third 6.13and fourth 6.14amplitude detectors, the inputs of which are respectively the first, second, third and fourth inputs of the block 6 allocation of additional sequences, the output of the first amplitude detector 6.11connected to the first input of the first adder 6.31, the second input is connected to the output of the first inverter 6.21, whose input is connected to the output of the second amplitude detector 6.12the output of the third amplitude detector 6.13connected to the first input of the second adder 6.32, the second input is connected to the output of the second inverter 6.22the entrance to the adders are respectively the first and second outputs of the block 6 additional sequences.

Amplitude detectors 6.11, 6.12, 6.13, 6.14designed to highlight the envelope of the signal and eliminate the carrier frequency vibrations. They can be implemented as described in the book of N. L Joe E. N. Kudelin, O. P. linuk "non-linear electronic device. Part I" (M: Voenizdat, 1982, S. 144-149, Fig.5.3).

Inverters 6.21, 6.22designed for inverting the signal voltage. They can be implemented on the basis of the inverting amplifier with gain equal to one, as described in the book U., K. Schenk "Semiconductor circuit" (M.: Mir. 1982, S. 76-77, Fig.6.13).

Adders 6.31, 6.32designed for summing the signal voltage. They can be implemented as described in the book of U. the TIC, K. Schenk "Semiconductor circuit" (M.: Mir, 1982, S. 137, Fig.11.1).

Two-channel coherent filter 7 is designed to compress additional sequences to the duration of one element of the Quaternary-coded sequence. It can be implemented as opisanie negative voltage pulse arriving at its second input, a positive voltage pulse received at its first input. It can be implemented as described in the book of U. the TIC, K. Schenk "Semiconductor circuit" (M.: Mir, 1982, S. 137-138, Fig.11.2).

Crucial unit 9 is designed for decision passed Quaternary-coded sequence. It can be implemented on the basis of the comparator, as described in the book of U. the TIC, K. Schenk "Semiconductor circuit" (M.: Mir, 1982, S. 76-77, Fig.6.13).

Transmission system the Quaternary-coded radio signals (Fig.1) works as follows.

When the system is turned on in the transmission of the generator 1 clock pulses generates a sequence of clock pulses with a duty cycle equal to one. Each element of this sequence with a high level of "1" will be considered odd, and with a low level "0" is even. In the imaging unit 2 D-codes this sequence is converted into a code sequence (D-code) with period N=2kwhere k2 is an integer. From the output of the shaper 2 D codes code sequence is supplied to a second input of the shaper 3 signals of two frequency-shift keying, and to the first input of the shaper 3 signals of the double is mulsow, in the imaging unit 3 signals of two frequency-shift keying code sequence is converted into the Quaternary-coded signal. In the Quaternary-coded signal will be the following items:,,,, where , transmit odd elements D-code, and even elements of the D-code.

The change of high-frequency oscillations of the Quaternary-coded signal generated in the imaging unit 3 signals twice manipulation, can be described, for example, the rule shown in the table,

where

f1<f<f<for f1>f2>f3>f4;

f1= |f1-f2|, f2= |f2-f3|, f3= |f3-f4| - a frequency shift between adjacent frequencies;

f1= nB, f2= mB, f3= zB;

In - baud sequence of elements of D code (technical speed), it is expressed by the number of messages transmitted per unit of time, measured in bauds.

n = 1,2,.... is an integer;

m = 1,2,.... is an integer;

z = 1,2,.... - an integer.

When n= m=z=1 f1= f2= f3then , the imaging unit 3 signals of two frequency-shift keying forms a Quaternary-coded radiosignal with the amplitude of the signal.

The Quaternary-coded signal generated in the imaging unit 3 double frequency manipulation comes in tract distribution 4, wherein the elements of the quadruple-encoded signal fulfil the orthogonality condition on the frequency.

Through tract distribution 4, the Quaternary-coded signal to the input of the selector signals 5 (Fig.2), which is the input receiving part of the system.

The Quaternary-coded radio signal is simultaneously fed to the input of the first 5.11second 5.12third 5.13and fourth 5.14bandpass filters. Bandpass filters 5.11, 5.12, 5.13, 5.14perform frequency selection strictly defined high-frequency radio signals Quaternary-coded signal:

< / BR>
< / BR>
< / BR>
< / BR>
The outputs of bandpass filters 5.11, 5.12, 5.13, 5.14respectively formed of the first, second, third and fourth high-frequency radio signals. The first, second, third and fourth high frequency signals on the respective outputs of the selector 5 signals respectively received on the first, second, third and fourth I the th high-frequency signals on the respective outputs of the block 6 additional sequences are received at the inputs of the respective amplitude detectors. Amplitude detectors 6.11, 6.12, 6.13, 6.14carry out respectively the separation of the envelope from the first, second, third and fourth high-frequency radio signals and elimination of carrying high-frequency oscillations. The first output signal of the first amplitude detector 6.11supplied to the first input of the first adder 6.31. The second output of the second amplitude detector 6.12is fed to the input of the first inverter 6.21and with the output of the first inverter 6.21the inverted signal is supplied to the second input of the first adder 6.31.

The third output of the third amplitude detector 6.13supplied to the first input of the second adder 6.32. The fourth signal from the fourth output of the amplitude detector 6.14is fed to the input of the second inverter 6.22and with the output of the second inverter 6.22the inverted signal is supplied to the second input of the second adder 6.32. The outputs of the first 6.31and second 6.32adders respectively formed of first and second additional sequence. The first additional sequence is formed from the odd-numbered elements of the quadruple-Kadirova new Quaternary-coded sequence (selection items).

Generated additional sequences do to corresponding inputs of a dual channel matched filter 7, it outputs additional sequences are compressed to a duration of one element of the Quaternary-coded sequence, and the voltage becomes larger in the 2k-1time elements accept the Quaternary-coded sequence. In myCitadel 8 is provided subtract a negative pulse voltage of 2k-1received at its second input, a positive pulse voltage of 2k-1arriving at his first entrance. Consequently, at the output of vicites 8 to generate a pulse with a voltage of 2ktimes the amplitude of the item taken Quaternary-coded sequence. In the result of the convolution is the Quaternary-coded sequences (codes Welty or E-codes), characterized in that it has no lateral emissions in aperiodic ACF.

In the final block 9 of the decision on the transfer of the Quaternary-coded sequence.

Thus, the proposed transmission system Quaternary-coded radio signals provides the expansion of the field of application is diapazonov waves, for example, in systems with code multiplexing of signals and systems with multiple access.

1. Transmission system the Quaternary-coded radio signal containing the transmission of the clock pulses, the output of which is connected to the shaper D-codes, the output of the transmitting part is connected through tract distribution to the entrance of the receiving part of the system, which includes myCitadel, the output of which is connected to a decisive block whose output is the output of the receiving part of the system, characterized in that the transmitting part of the system additionally introduced shaper signals of two frequency-shift keying, the first and second inputs of which are respectively connected to the outputs of the clock and shaper D-codes, and the shaper's output signals of two frequency-shift keying is the output of the transmitting part of the system, the receiving part of the system inputs of the selector signal, the input of which is the input receiving part of the system, and the first, second, third and fourth outputs respectively connected to the first, second, third and fourth inputs of the block allocation of additional sequences, the first and second outputs which podkluchaetsia connected to first and second inputs of myCitadel.

2. The system under item 1, characterized in that the selector signal consists of first, second, third and fourth bandpass filters whose inputs are combined and are input selector signals, and outputs first, second, third and fourth bandpass filters are respectively the first, second, third and fourth outputs of the selector signals.

3. The system under item 1 or 2, characterized in that the block allocation of additional sequence consists of first, second, third and fourth amplitude detectors, the inputs of which are respectively the first, second, third and fourth inputs of the block allocation of additional sequences, the output of the first amplitude detector connected to the first input of the first adder, the second input is connected to the output of the first inverter, whose input is connected to the output of the second amplitude detector, the output of the third amplitude detector connected to the first input of the second adder, the second input is connected to the output of the second inverter, the inlet of which is connected to the fourth output of the amplitude detector, and the output of the first and second adders are respectively the first and second outputs forming unit

 

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