The wireless link connection with the spatial signal separation

 

The wireless link connection with the spatial separation of the signal relates to the field of discrete information transmission and can be used in radio channels in communication with moving objects, and Vice-duplex radio control and packet radio networks operational command transmission in unprotected areas. Technical result achieved - improving the noise immunity of the transmitted information when you duplicate it using orthogonally polarized signals. Radio line connection contains on the transmission side of the generator carrier and clock frequencies 1, shaper orthogonal pseudorandom sequence 2, the pseudo-random sequence generator 3, the block phase 4, the multipliers 5, 6, block addition 9, the phase shifter 90 7, phase arm 8, the power splitter 19, the amplifiers 20, 21, irradiators transmitting antenna 22, 23. At the receiving side of the wireless link connection includes a synchronizer 15, the multiplier products 10, 11, shaper orthogonal pseudo-random sequence 12, the generator of the reference pseudo-random sequence 13, block phasing 14, bandpass filters 16, 17, phase detector 18, the adder 28, the amplitude limiter 29, pathogens, peredachi discrete data and can be used in radio channels to transmit information in communication with moving objects, and in reverse duplex radio control and packet radio networks operational command transmission in unprotected areas.

Known communication systems with noise-like signals, such as, and. S. No. 651492, which serves for transmission of discrete information.

The main disadvantage of this system is the low immunity in conditions of interference with a concentrated spectrum, which is caused by neoptimalizovat algorithm signal processing with respect to such interference.

Also known broadband communication system with PSS (see Varakin L. E. "communication Systems with noise-like signals". - M.: "R. and C.", 1985, S. 16, Fig.1.7) designed for the transmission of discrete messages.

This device only has one antenna with vertical (horizontal polarization). And this may lead to a relatively easy suppression of the signal at the input of the receiver.

The closest to the technical nature of the proposed facility is "Apparatus for transmission of discrete information". S. No. 300946, taken as a prototype.

Functional diagram of the device of the prototype is shown in Fig.1, where introduced the following notation:

1 is a generator of oscillations of the carrier and clock frequencies (Gtchina sequence (GPP);

4 - unit phasing;

5, 6, the first and second multipliers;

7 - Phaser 90;

8 - phase manipulator;

9 is a diagram of the addition;

10, 11, the first and second multiplier products;

12 - shaper orthogonal pseudo-random sequences (FOPP);

13 - reference generator pseudo-random sequence (GOP);

14 - device phasing;

15 - device synchronization;

16, 17, the first and second bandpass filters;

18 is a phase detector.

The device prototype has the following functional relation.

On the transmission side of the generator carrier and clock frequencies (GNTC) 1 one output connected to the first inputs of the former (2 orthogonal SRP (FOPP) and generator 3 pseudo-random sequence (GPP), the second inputs of which are connected to the outputs of block phasing 4, the outputs FOPP 2 and 3 GPP, respectively, through the first 5 and second 6 multipliers connected to the input circuit of the summing 9, the second output GNTC 1 through the phase shifter 7 90connected with the second input of the first multiplier 5, and through the phase arm 8 to the second input of the second multiplier 6. At the receiving side, the receiver input is connected to the input of the synchronizer 15 and enter the waters of which are connected to the outputs of block 14 phasing the outputs of the first 10 and second 11 multiplier products respectively through the first 16 and second 17 bandpass filters connected to the inputs of phase detector 18, the output FOP 12 is connected with the second input of the first multiplier 10, and the output GAP 13 is connected to a second input of the second multiplier 11.

Function prototype as follows.

In the transmitter GNTC 1 generates two frequencies: a clock for POP 2 and 3 GPP and the carrier frequency signal.

Clocked output GNTC 1 arrives at the inputs of POP 2 and 3 GPP, which produce a binary pseudo-random sequence - SRP. These SRP represent sets of bipolar pulses of direct current of the same magnitude and duration, which is determined by the clock frequency. The laws of formation of the SRP shall be such to ensure low cross-correlation between the pseudo-random sequences FOPP 2 and 3 GPP at any phase shift between them (quasiorthogonal binary SRP). This condition is necessary for their effective separation and suppression of the echo signals in the receiver.

The device phasing 4 sets shift registers POP 2 and 3 GPP in the same initial state, so that the communication phase of their pseudomucinous scheme phasing which provides a combination of initial conditions in phase. Binary SRP output FOPP 2 is supplied to the multiplier 5. To the second input of the multiplier 5 through the phase shifter 907 output GNTC 1 receives the oscillation of the carrier frequency, which in the multiplier 5 multiplies the binary SRP. As a result, the output of the multiplier 5 is formed a signal representing the oscillation of the carrier frequency with a constant amplitude shift keyed phase by 180by law, the binary chipboard.

Binary SRP output GPP 3 is supplied to the multiplier 6, the second input is through the phase manipulator 8 output GNTC 1 receives the oscillation of the carrier frequency. At the output of the multiplier 6 is formed a signal representing the oscillation of the carrier frequency with a constant amplitude shift keyed phase by 180by law, the binary SRP. Depending on the sign of the transmitted information phase arm 8 carries out the rotation phase of the carrier frequency signal at the output of the multiplier 6 relative to the carrier frequency of the signal at the output of the multiplier 5 to 0 or 180. Thus, depending on the sign of the transmitted information-bearing frequency of these signals sdvinutyj signal transmitter, representing the oscillation of the carrier frequency with a constant amplitude shift keyed phase 0, 90, 180and 270and moments of manipulation and the order of these values of the phases is determined by the ratio of characters of the binary elements of the SRP POP 2 and 3 GPP and transmitted phase difference.

With schema adding 9 signal enters the high-frequency transmitter and radiated in the air.

The received signal output from the high frequency receiver is fed to the multipliers 10 and 11, similar to the multipliers 5 and 6 of the transmitter. In the multiplier 10 a received signal is multiplied by a binary SRP, which produces POP 12, similar POP 2 transmitter. The output signal from the multiplier 10 is supplied to the bandpass filter 16, which allocates the oscillation of the carrier frequency signal.

In the multiplier 11 and the received signal is multiplied by a binary SRP, which forms GAP 13, similar to the 3 GPP transmitter. The output signal from the multiplier 11 is supplied to band-pass filter 17, which allocates manipulated by phase fluctuations of the carrier frequency signal. The device phasing 14, similar to the device phasing 4 transmitter communicates over f is PP 3 of the transmitter. Binary SRP produced by the generators in the receiver is synchronized with the binary SRP received signal using the synchronization device 15. As a synchronization device 15 can be used the known device, ensure the synchronism of the local signal of the receiver with one of the strongest rays of the received multipath signal on the basis of the analysis of the function of cross correlation between the received and local signals.

As is known, when using broadband signals can be provided effective suppression of interfering rays or the addition of several selected the strongest rays, and the suppression of concentrated interference.

The oscillation of the carrier frequency from the outputs of bandpass filters 16 and 17 is supplied to a phase detector 18, which measures the information of the phase difference between them.

The disadvantage of this device prototype is a low immunity, since the information signal is transmitted on one polarization, and the enemy can easily create interference and to suppress this information.

To eliminate this drawback in the device containing on the transmission side of the generator carrier and clock frequencies (GNTI), the first input connected to the first input is coherence (GSP) the second inputs of which are connected to the outputs of block phasing outputs FOP and GPP, respectively through the first and second multipliers connected to inputs of block addition, the second output GNTC through the phase shifter 90connected with the second input of the first multiplier, and through the phase manipulator to the second input of the second multiplier and the second input of the phase manipulator is an information input at the receiving side - synchronizer, an input connected to the first inputs of the first and second multiplier products, the output of the synchronizer is connected with the first inputs FOPP and generator reference pseudo-random sequence (GOP), the second inputs of which are connected to respective outputs of the block phasing output FOPP connected with the second input of the first multiplier, the output GAP connected to the second input of the second multiplier, the outputs of the first and second multiplier products respectively through the first and second bandpass filters are connected to first and second inputs of the phase detector whose output is the output of the receiving side device, introduced on the transmission side of the power splitter and the first and second amplifiers, at the receiving side connected in series of savetitle power, the first and second outputs of which are connected with inputs of the first and second amplifiers, the outputs of which are connected with the first and second horn of the transmitting antenna. At the receiving side output of the amplitude limiter connected to the clock input. The first and second agents of the receiving antenna is connected to the first and second inputs of the adder, respectively.

In Fig.2 shows a functional diagram of the proposed radio link, where indicated:

1 is a generator of oscillations of the carrier and clock frequencies (GNTC);

2 - shaper orthogonal pseudo-random sequences (FOPP);

3 is a pseudo - random sequence generator (HPG);

4 - unit phasing;

5, 6, the first and second multipliers;

7 - Phaser 90;

8 - phase manipulator;

9 is a block addition;

10, 11, the first and second multiplier products;

12 - shaper orthogonal pseudo-random sequences (FOPP);

13 - reference generator pseudo-random sequence (GOP);

14 - unit phasing;

15 - synchronizer;

16, 17, the first and second bandpass filters;

18 phase detector;

19 - splitter power;

20, 21, the first and second amplifiers;

22, 23, the first and the Noah antennas;

27 - reception antenna;

28 - adder;

29 is the amplitude limiter.

The transmitter comprises a generator of carrier and clock frequencies (GNTC) 1, one output connected to the first inputs of the former (2 orthogonal SRP (FOPP) and generator 3 pseudo-random sequence (GPP), the second inputs of which are connected to the outputs of block phasing 4, the outputs FOPP 2 and 3 GPP, respectively, through the first 5 and second 6 multipliers are connected with the inputs of the unit of addition 9, the second output GNTC 1 through the phase shifter 7 is connected to the second input of the first multiplier 5, and through the phase arm 8 to the second input of the second multiplier 6, the output of summing 9 is connected to the input of the power splitter 19, a first outlet through which the first amplifier 20 is attached to the first irradiator 22 of the transmitting antenna 24, and the second output of the power splitter 19 through the second amplifier 21 is attached to the second irradiator 23 of the transmitting antenna 24.

Reception side contains the first 25 and second 26 agents of the receiving antenna 27 connected respectively with the first and second inputs of the adder 28, the output of which is connected to the input of the amplitude limiter 29, the output of which is connected to the input of the synchronizer is the second inputs of which are connected to the outputs of block phasing 14, the outputs of the first 10 and second 11 multiplier products, respectively, by 16 and 17 second bandpass filters connected to the inputs of phase detector 18, the output FOP 12 is connected to a second input of the first multiplier 10, and the output GAP 13 is connected to a second input of the second multiplier 2.

The proposed device is as follows.

In the transmitter GNTC 1 generates two frequencies: a clock for POP 2 and 3 GPP and the carrier frequency signal.

Clocked output GNTC 1 arrives at the inputs of POP 2 and 3 GPP, which produce a binary pseudo-random sequence - SRP. These SRP represent sets of bipolar pulses of direct current of the same magnitude and duration, which is determined by the clock frequency. The law of formation of the SRP is selected in order to provide low cross-correlation between the pseudo-random sequences FOPP 2 and 3 GPP at any phase shift between them (quasiorthogonal binary SRP). This condition is necessary for their effective separation and suppression of the echo signals in the receiver.

The device phasing 4 sets shift registers POP 2 and 3 GPP in the same initial state, so that the communication phase of their pseudorandom after the scheme phasing which provides a combination of initial conditions in phase.

Binary SRP output FOPP 2 is supplied to the multiplier 5. To the second input of the multiplier 5 through the phase shifter 907 output GNTC 1 receives the oscillation of the carrier frequency, which in the multiplier 5 multiplies the binary SRP. As a result, the output of the multiplier 5 is formed a signal representing the oscillation of the carrier frequency with a constant amplitude shift keyed phase by 180by law, the binary SRP.

Binary SRP output GPP 3 is supplied to the multiplier 6, the second input is through the phase manipulator 8 output GNTC 1 receives the oscillation of the carrier frequency. At the output of the multiplier 6 is formed a signal representing the oscillation of the carrier frequency with a constant amplitude shift keyed phase by 180by law, the binary SRP. Depending on the sign of the transmitted information phase arm 8 carries out the rotation phase of the carrier frequency signal at the output of the multiplier 6 relative to the carrier frequency at the output of the multiplier 5 to 0 or 180. Thus, depending on the sign of information transmitted carrier frequencies of these signals are shifted between the s of the carrier frequency with a constant amplitude, manipulated in phase by 0, 90, 180and 270and moments of manipulation and the order of these values of the phases is determined by the ratio of characters of the binary elements of the SRP POP 2 and 3 GPP and transmitted phase difference.

Block adding 9 signal is supplied to the power splitter 19, which is a division of its power in half, and each half is issued respectively on the two outputs to the inputs of the first 20 and second 21 power amplifiers, where it is amplified to the required size. The signals from the outputs of the first 20 and second 21 amplifiers come respectively to the inputs of the first 22 and second 23 irradiators transmitting antenna 24, which may be implemented in the form of a reflector antenna with two irradiators or in the form of array antennas with appropriate agents. The irradiators 22 and 23 create fields with orthogonal one with respect to another linear or circular polarization.

The signals emitted by the transmitting antenna 24, are receiving antenna 27. It irradiators (pathogens) 25, 26 are also orthogonal linear or circular polarization. Receiving antenna 27 and irradiators (vozbuditel is respectively to two inputs of the adder 28 and the output of this adder - to the input of the amplitude limiter 29, which is a fairly low level.

Limited the amplitude of the output signal of the amplitude limiter 29 is supplied to the multiplier products 10 and 11.

In the multiplier 10 a received signal is multiplied by a binary SRP, which produces FOP 12.

The output signal from the multiplier 10 is supplied to the bandpass filter 16, which allocates the oscillation of the carrier frequency signal.

In the multiplier 11 and the received signal is multiplied by a binary SRP, which forms GAP 13.

The output signal from the multiplier 11 is supplied to band-pass filter 17, which allocates manipulated by phase fluctuations of the carrier frequency signal.

The device phasing 14 provides communication phase output sequences FOPP 12 and GAP 13 corresponding to the communication phase sequences FOPP 2 and 3 GPP transmitter.

Binary SRP produced by the generators in the receiver is synchronized with the binary SRP received signal using a synchronizer 15. As a synchronizer 15 can be used the known device, ensure the synchronism of the local signal of the receiver with one of the strongest rays of the received multipath signal based on the analysis of features of interaction is strong isolation between antennas with horizontal and vertical polarization. Minimum separation standards is 27 dB, almost at the frequencies of 4-6 GHz junction reaches ~55 dB. The jammer, as a rule, has a single antenna with horizontal or vertical polarization. Practical interest in radio communication with two antennas with horizontal and vertical polarizations as on the sending and on the receiving end. If the noise overwhelms the signal from one of the polarizations, the antenna with the other polarization signal is suppressed almost won. As noted above, the minimum separation between antennas with vertical and horizontal polarization is 27 dB. Thus, the expected effect from the use of two antennas with different polarizations in practically important cases can significantly improve the noise immunity of radio links. The increase in cost is not more than 5-10%.

Claims

The wireless link connection with the spatial separation of the signal, containing on the transmission side of the generator carrier and clock frequencies (GNCC), the first output of which is connected with the first inputs of the former (orthogonal pseudo-random sequences (FOP) and the generator p is FOP and GPP, respectively through the first and second multipliers connected to inputs of the unit of addition, the second output GNTC through the phase shifter 90 is connected with the second input of the first multiplier, and through the phase manipulator to the second input of the second multiplier and the second input of the phase manipulator is an information input at the receiving side - synchronizer, an input connected to the first inputs of the first and second multiplier products, the output of the synchronizer is connected with the first inputs FOPP and generator reference pseudo-random sequence (GOP), the second inputs of which are connected to respective outputs of the block phasing output FOPP connected with the second input of the first multiplier, the output GAP connected to the second input of the second multiplier, the outputs of the first and second multiplier products respectively through the first and second bandpass filters are connected to first and second inputs of the phase detector whose output is the output of the receiving side device, characterized in that the input on the transmission side of the power splitter and the first and second power amplifiers, the signal outputs are transmitted respectively to the inputs of the first and second horn of the transmitting antenna, the input of the power splitter is connected to the output of block addition, and first and second outputs rasveti - sledovatelno United adder and the amplitude limiter, the output of which is connected to the clock input, the first and second inputs of the adder is connected to the first and second agents of the receiving antenna, respectively.

 

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