Line radio

 

(57) Abstract:

The invention relates to radio communications and can be used in space and terrestrial communication systems using spatial modulation. The technical result is to enhance the functionality and improve the speed of information. Line radio contains on the transmission side of the generator carrier and clock frequencies, two channel forming orthogonal frequency channels, one of which is used as a sync channel, and the second as a carrier of information. At the receiving side to synchronize the received signal with the reference and the selection of the received information. Introduction on the transmission side frequency synthesizer, two keys, bass and adder, and the reception of the two bandpass filters, two schemes for selecting the maximum of the comparison circuit and the phase shifter 90 allowed two orthogonal channels to transmit both the basic information and additional, which can be used as a service channel. 4 Il.

The proposed device relates to the field of radio communications and can be used in space and terrestrial communication systems using spatial modulation.

It is also known device.with. N 1141978 containing two channels, one of which information is transmitted using angular modulation, and the second channel using the additional modulation signals according to the polarization of the waves, making it possible to pass additional information (reuse frequency).

However, in the case of wideband signals, which is typical for modern communication systems, low immunity receiving information on the second channel due to the low noise reference signal for the synchronous detector.

The closest to the technical nature of the claimed object is "Apparatus for transmission of discrete information", ed.St. N 300946, taken as a prototype.


1 - the generator carrier and clock frequency (GTN);

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, respectively;

7 - Phaser 90o;

8 - phase manipulator;

9 is a diagram of the addition.

Receiving device:

10, 11, the first and second multipliers, respectively;

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, respectively;

18 is a phase detector.

The device prototype contains on the transmission side GNTC, the first output of which is connected with the first inputs FOPP and GPP, the second inputs of which are connected respectively to the first and second outputs of the device phasing 4, exit POP connected to the first input of the first multiplier 5, a second input connected to the output of the phase shifter 90o7, and the input of the phase shifter connected to one of inputs of fatwah of which is connected to the output of the phase manipulator 8, and the output of the second multiplier 6 is connected with the second input of the differential summing 9, the first input connected to the output of the first multiplier 5, the output of the adder 9 is the transmitter output, the first input of the phase manipulator 8 is an information input; at the receiving side input synchronization device 15 is connected with the first inputs of the first 10 and second 11 multipliers, the outputs of which are connected respectively to the inputs of the first 16 and second 17 of bandpass filters whose outputs are connected respectively with the first and second inputs of the phase detector 18. the output which is the output device, the output of the synchronization device 15 is connected with the first inputs FOPP and GAP, the second inputs of which are connected respectively to the first and second outputs of the device phasing 14, the output POP connected with the second input of the first multiplier 10, and the output GAP connected to the second input of the second multiplier 11.

The device prototype works as follows.

In the transmitter GNTC generates two frequencies clock frequency for POP and GPP and the carrier frequency signal. Clocked output GNTC is fed to the input POP and GPP that produce double pseudo-random sequence. Edicine and duration, which is determined by the value of the clock frequency. The laws of formation of pseudo-random sequences are selected so as to ensure low cross-correlation between the pseudo-random sequences FOPP and TPP at any phase shift between them (quasiorthogonal binary pseudo-random sequence. This condition is necessary for their effective separation and suppression of the echo signal in the receiver.

The device phasing 4 install the shift registers POP and GPP in the same initial state, so that the communication phase of their pseudorandom sequences. The device phasing 4 consists of decoders initial States FOPP and GPP and pulse phasing scheme, which provides a combination of initial conditions in phase. Binary pseudo-random sequence output FOPP is supplied to the multiplier 5. To the second input of the multiplier 5 through the phase shifter 90o7 output GNTC comes oscillation of the carrier frequency, which in the multiplier 5 is multiplied by a binary pseudo-random sequence. As a result, the output of the multiplier 5 is formed a signal representing the oscillation of the carrier frequency with a constant amplit pseudorandom sequence output GPP is supplied to the multiplier 6, to the second input of which a phase manipulator output GNTC comes 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 180oby law, a binary pseudo-random sequence. Depending on the law 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 180o. Thus, depending on the sign of information transmitted carrier frequencies of these signals are shifted from each other in phase. From the outputs of the multipliers 5 and 6, the signals are sent to the scheme of adding 9, which forms an output signal representing the oscillation of the carrier frequency with a constant amplitude shift keyed phase at 0o, 90o, 180oand 270oC, and moments of manipulation and the order of these values of the phases is determined by the ratio of the signs of the elements of the binary pseudo-random sequences FOPP and GPP and transmitted phase difference. With schema adding 9 signal enters the high-frequency transmitter and radiated in the air.

Fluctuations of the carrier frequency from the outputs of bandpass filters 16 and 17 are received by a phase detector 18, which measures the information of the phase difference between them.

This device prototype inherent drawback: to transfer increasing amounts of information, it is necessary to increase the transmission rate or the number of radio channels, which in both cases leads to the expansion of radio frequency bands. And as you know, currently, the range of frequencies, from the lowest VLF to the highest microwave, very congested. Therefore, the task of allocating any part of the radio spectrum is becoming increasingly problematic.

The proposed device allows you to transfer in addition to the main INF, additional - INF using the same radio channel.

This is achieved in that in a device containing on the transmission side: the generator carrier and clock frequencies (GNCC), the first output of which is connected with the first choice of the th sequence (GSP) the second inputs of which are connected with the first and second outputs of the device phasing output POP through the first multiplier connected to the first input of the first circuit of the addition as the output GPP through the second multiplier is connected to a second input of the first circuit addition, the second inputs of the first and second multipliers connected respectively to the outputs of the phase shifter 90oand phase of the manipulator, the inputs of which are connected; at the receiving side: input synchronization device is connected to the first and second inputs of the first and second multipliers, and the output of the synchronization device is connected with the first inputs FOPP and GAP, the second inputs of which are connected to first and second outputs of the device phasing, and outputs FOPP and GAP respectively connected with the second inputs of the first and second multipliers, the outputs of the first and second multipliers connected to the inputs of the first and second bandpass filters, respectively, and a phase detector, introduced at the transmitting side: a frequency synthesizer, bass-reflex, the first and second keys and the second circuit adding; at the receiving side: the third and fourth bandpass filters, the comparison circuit, the first and second circuit selecting maximum and the phase shifter 90oC.

In Fig. 3, 4 shows a functional SEMA of radio communications.

Line radio contains on the transmission side of the generator 1 of the oscillations of the carrier and clock frequencies (GTN) driver orthogonal pseud is of 4, first and second multipliers 5, 6, Phaser 90o7, the phase manipulator 8, the addition of 9, the frequency synthesizer 19, photogenerator 20, the first and second keys 21, 22, the second circuit adding 23 at the receiving side, the first and second multipliers 10, 11, shaper orthogonal pseudo-random sequences (FOPP) 12, reference generator pseudo-random sequence (GOP)13, the device phasing 14, a synchronisation unit 15, the first and second bandpass filters 16, 17, phase detector 18, the third and fourth bandpass filters 24, 25, the comparison circuit 26, the first and second circuit selection maximum of 27, 28, Phaser 90o29.

The proposed device has the following functional relationships: on the transmitting side of the first generator output fluctuations of the carrier and clock frequency 1 is connected to the inputs FOPP, GPP and the second output of this GNTC connected to the input of the frequency synthesizer 19, second input Poppy GPP connected with the first and second outputs of the device phasing 4, respectively, the first and second outputs of the frequency synthesizer 19 through the first 21 and second 22 keys respectively connected to first and second inputs of the second adder 23, respectively, the control input key 22 is connected to the input fasoula multiplier 5, the second input of which is connected to the output of the phase shifter 90o7, and the output of the multiplier is connected to one input circuit of the summing 9, the second input of which is connected to the output of the second multiplier 6, one input of which is connected to the output GPP, and the second input of the multiplier is connected to the output of the phase manipulator 8, an input connected to the input of the phase shifter 90o7 and with the output of the adder 23; at the receiving side input synchronization device 15 is connected to the inputs of the first 10 and second 11 multipliers, the second input of the first multiplier 10 is connected to the output FOPP, one input of which is connected with the output of the synchronization device 15 and one input GAP, a second input connected to one of the outputs of the device phasing 14, the second output of which is connected to the second input FOPP, the output of the first multiplier 10 is connected to the inputs of the first 16 and third bandpass filters 24, the outputs of these filters are connected to first and second inputs of the first circuit selection maximum 27 respectively, the output of which through the phase shifter 29 is connected to one of the outputs of the phase detector 18, the second input is connected to the output of the second circuit selection maximum of 28, two inputs of which are connected by sooyoon fourth bandpass filter 25, and the second input of this circuit selection maximum connected to the output of the second bandpass filter 17, the second inputs 17 and fourth bandpass filters 25 are connected with the output of the second multiplier 11; the outputs of the phase detector 18 and the comparison circuit 26 are first and second outputs of the receiving device, respectively.

The proposed device operates as follows.

In the transmitter generator carrier and clock frequency 1 (GNTC) generates two frequencies: a clock for POP and GPP and the carrier frequency of the signal supplied to the frequency synthesizer 19. Clocked output GNTC is fed to the input POP and GPP that produce 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 value of the clock frequency. The laws of formation of the SRP shall be such to ensure low cross-correlation between the pseudo-random sequences FOPP and 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 F. the communication phase of their pseudorandom sequences. The device phasing 4 consists of decoders initial States FOPP and GPP and pulse phasing scheme, which provides a combination of initial conditions in phase. Binary SRP output FOPP is supplied to the multiplier 5, the second input is through the phase shifter 90o7 receives the oscillation of the carrier frequency from the output of the adder 23. From the second output GNTC oscillation of the carrier frequency to the input of the frequency synthesizer 19, where this oscillation generates a first f1and the second f2carrier frequencies and through which the first key 21 and the second key 22, respectively, are interconnected to the inputs of the second summing device 23. Control keys 21 and 22 is a signal information "INF", with the first key through port 20. From the output of the second summing device 23 of the carrier frequency f1and f2arrive at the inputs of the phase manipulator 8 and the phase shifter 90o7. In the multiplier 5, the binary signal SRP received at the first input of the multiplier is multiplied by the carrier signal supplied to the second input of the multiplier. As a result, the input of the multiplier 5 is formed a signal representing the oscillation of the carrier frequency with a constant amplitude, manipulated by vtorogo signal from the phase manipulator 8. At the input of the multiplier 6, so as to form a signal representing the oscillation of the carrier frequency with a constant amplitude shift keyed phase by 180oby law, the binary SRP. Depending on the sign of the transmitted information "INF" 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 180o. Thus, depending on the sign of information transmitted carrier frequencies of these signals are shifted from each other in phase. From the outputs of the multipliers 5 and 6, the signals are sent to the scheme of adding 9, which forms an output signal representing oscillations of the carrier frequencies f1and f2with a constant amplitude shift keyed phase at 0o, 90o, 180oand 270oand moments of manipulation and the order of these values is defined by the ratio of characters of the binary elements of the SRP POP and GPP and transmitted phase difference INF. 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 UMNIK. The output signal from the multiplier 10 is supplied to bandpass filters 16, 4, which are tuned respectively to frequencies f1and f2and depending on what frequency (f1or f2) was passed a signal at the moment, through the filter and passes the received signal. Outputs of the filters 16 and 24 signal is supplied to the circuit selection maximum of 27, (more precisely, the signal at the moment comes from only one of these filters, and the other with only the noise), which is selecting the highest value of the two signals, and this will be a useful signal, taken from one of the filters. With a scheme of selecting the maximum of 27 signal through the phase shifter 90o29 is fed to one input of phase detector 18.

In the multiplier 11 and the received signal is multiplied by a binary SRP, which forms GAP similar GPP transmitter. The output signal from the multiplier 11 is supplied to bandpass filters 11, 25, configured as filters 16, 24, at frequency f1and f2. With filters 17, 25 signal fed to the inputs of the comparison circuit 26, the output of which is signal INF". With these filters 17, 25 signal also is fed to the inputs of the second circuit selection maximum of 28, a similar pattern selection maximum of 27. From the output of the second circuit selecting maxido them and the output of which is signal INF". The device phasing 14, similar to the device phasing 4 transmitter provides connection phase output sequences FOPP and GOP corresponding connection phase sequence FOPP and GPP 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 synchronization, ensuring the synchronism of the local signal of the receiver with one of the strongest rays taken monoglucoside signal on the basis of the analysis of the function of cross correlation between the received and local signals.

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

Thus, if the device prototype using two orthogonal channels is only one main information, the proposed device using the same two orthogonal channels is transmitted in addition to the main even and Supplement the s in many cases, to withdraw from the organization of special bearer service information.

Line radio reuse frequency, containing on the transmitting 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 (FOPP) and pseudo-random sequence generator (HPG), to the second inputs of which are connected respectively to the first and second outputs of the device phasing out POOP through the first multiplier connected to the first input of the first circuit of the addition as the output GPP via a second multiplier connected to the second input of the first circuit of the addition, to the second inputs of the first and second multipliers connected respectively to the outputs of the phase shifter 90oand phase of the manipulator, the inputs of which are connected, at the receiving side is a phase detector, device synchronization, the input connected to the inputs of the first and second multipliers, and the output of the synchronization device is connected with the first inputs FOPP and generator reference pseudo-random sequence (GOP), to the second inputs of which are connected respectively to the first and second outputs of the device phasing, and outputs FOPP and HOPP connected to the second inputs of the first and vtoro the bandpass filters, characterized in that the input on the transmission side of the first and second keys, bass-reflex, the second scheme of addition and the frequency synthesizer to the second input of which is connected to the output GNTC, and first and second outputs of the frequency synthesizer, respectively through the first and second keys are connected to first and second inputs of the second circuit of the addition, the output of which is connected to the inputs of the phase shifter 90oand phase of the manipulator, while the input of the inverter is connected with a source of INFO 2 and control input of the second key, and the output of the inverter is connected with the control input of the first key and at the receiving side, the third and fourth bandpass filters, Phaser 90othe comparison circuit, the first and second circuits select high, while the outputs of the first and third bandpass filters connected respectively to first and second inputs of the first circuit select maximum, the output of which is through the phase shifter 90oconnected to the first input of the phase detector to the second input of which is connected to the output of the second circuit selecting the maximum input of the third bandpass filter connected to the input of the first bandpass filter and the input of the fourth bandpass filter connected to the input of the second polomano, to the first input and the second input of the comparison circuit connected to the output of the fourth bandpass filter.

 

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