Radio system with reuse frequency

 

(57) Abstract:

The invention relates to radio communications and can be used in space and terrestrial radio links with reuse frequency. Technical result achieved - increase system throughput. Stated communication system includes a transmitting-side signal generator, two amplitude modulator, anti-phase amplifier, two irradiator transmitting antenna, two power splitter, inverter, four keys, two adder, and at the receiving side two of the pathogen receiving antenna, the control unit the position of the axes of polarization of the agents of the receiving antenna, the adder, myCitadel, two lowpass filter, a synchronous detector, an amplitude limiter, a demodulator key messages, the demodulator amplitude-modulated signal. 3 Il.

The proposed device relates to the field of radio communications and can be used in space and terrestrial radio links with reuse frequency.

The known device using polarization modulation of the radio signals, in particular with elliptical polarization of the wave, by changing the parameters of the polarization ellipse (Gusev, K. the device is they can be used in conditions when the parameters of the distribution of signals on the track and the mutual position of the transmitting and receiving antennas is constant, since otherwise there is a great level of mutual interference between individual channels of the radio link. However, in most cases change as the parameters of the distribution of signals, and the relative locations of the antennas.

It is also known device (U.S. patent 4087818), in which the reuse of frequencies in a changing environment parameters of the distribution of signals and the relative position of the antennas is achieved by providing the orthogonal polarization of the two transmitted signals simultaneously with circular or linear polarization. This orthogonality is maintained with the help of automatic circuit in the form of a closed loop using a special pilot signals. It contains a transmitting device that generates two signals having the same frequency and mutually orthogonal polarized waves, a receiving device, which provides separate reception of these signals due to their orthogonal polarization.

However, this device due to the high requirements needed technostyle, the implementation of this device requires special additional communication lines.

The closest in technical essence to the present invention is a device and.with. 1385305 shown in Fig.1, where we have introduced the notation:

1 signal generator;

2 - splitter power;

3 and 4, the first and second amplitude modulators;

5 - phase with the amplifier;

6 and 7, the first and second irradiators (pathogens) of the transmitting antenna;

8 - transmit antenna;

9 and 10, the first and second irradiators (pathogens) receiving antenna.

11 - receiving antenna;

12 - sum-dierence block;

13 - adder;

14 - myCitadel;

15 - a synchronous detector;

16 - demodulator key messages;

17 - amplitude limiter;

18 and 19, the first and second low pass filters (LPF);

20 - unit control position of the axes of polarization of irradiators receiving antenna.

21 - key;

22 - phase detector;

23 - Phaser;

24 and 25, the first and second delay lines;

26 comparator.

The device prototype has the following functional relation.

On the transmission side input of the signal generator 1 is input to the main information SSS; the output of the first amplitude modulator 3 is connected to the first irradiator 6 of the transmitting antenna 8, and the output of the second amplitude modulator 4 is connected with the second irradiator 7 of the transmitting antenna 8; at the receiving side is the first irradiator (pathogen) 9 receiving antenna 11 via the control unit the position of the axes of polarization of the horn 20 is connected with the first inputs of the adder 13 and myCitadel 14 total differential unit 12, and the second irradiator (pathogen) 10 receiving antenna 11 via the control unit the position of the axes of polarization of the horn 20 is connected with the second inputs of the adder 13 and myCitadel 14 total differential unit 12; the output of the adder 13 through the amplitude limiter 17 is connected to the inputs of the phase detector 22 and the first delay line 24; the second input of phase detector 22 is connected to the output of the phase shifter 23 and the first input of the synchronous detector 15, the second input is through the second delay line 25 connected to the output of vicites 14; the output of the phase detector 15 is output to the additional information Sappr0and the second output of the demodulator is connected to the input of the phase shifter 23, the output of phase detector 22 through the second low pass filter 19 is connected to the input of the comparator 26, the output of which is connected with the control input of the key 21.

Function prototype as follows.

The signal generator 1 generates a signal to the main message, modulated in frequency or phase, the main message.

This signal is

uc(t) = ucos[t+(t)], (1)

where u is a constant signal amplitude;

(t) is a function of the phase change signal corresponding to a frequency or phase modulation of the main messages S0;

angular frequency.

Signal (1) is fed to the input of the power splitter 2, the output of which the signal branches into two channels that have amplitude modulators 3 and 4, is made in the form of high-frequency amplifiers.

In them the amplitude of the transmitted signals is changed in opposite phase according to the law passed additional messages with stress, SUB>3(t) = u1[1+f(t)]cos[t+(t)], (2)

u4(t) = u1[1-f(t)]cos[t+(t)], (3)

where u3(t) and u4(t) - signals at the inputs of the modulators 3 and 4, respectively;

u1- constant amplitude;

f(t) is a function of the amplitude of the signals corresponding to additional messages SSS.

Next, the signals (2) and (3) with the outputs of the amplitude modulators are received at the inputs of irradiators 6 and 7 of the transmitting antenna 8.

The transmitting antenna 8 may be made in the form of a reflector antenna with two irradiators 6 and 7 or in the form of array antennas with appropriate agents. Irradiators 6 and 7 create fields with orthogonal one with respect to another linear or circular polarization. The signals emitted by the transmitting antenna 8, are receiving antenna 11. It irradiators (pathogens) 9 and 10 are mutually orthogonal linear or circular polarization. Receiving antenna 11 with irradiators (pathogens) 9 and 10 are identical transmission.

Outputs irradiators 9 and 10 receiving antenna 11 will receive signals

< / BR>
where nx(t) is the fluctuation of the obstacle in the form of a normal Gaussian noise component of the x-axis;

nChi(t) - pulsed interference component (x axis);

inogo Gaussian noise component of y;

nyn(t) - pulsed interference component of the y-axis.

From the output of the adder 13 received the signal

< / BR>
and from the output of vicites 14 will receive

< / BR>
As a demodulator key messages 16 is used synchronous phase demodulator (IFD) with device rejection of anomalous leaps phase multiple of 2 radians occurring in the input mixture signal interference under the action of both fluctuation and pulse interference that can improve the noise immunity when exposed to complex interference on the units and tens of decibels depending on the base signal.

At the output of demodulator 16, operating in synchronous mode, there is a voltage varying according to a change in the frequency or phase of the input signal that is demodulated message.

To compensate for the constant phase shift used the phase shifter 23 90o, the output of which feeds the reference signal that does not contain information about the interference to the synchronous detector 15.

When exposed to the input of the system fluctuation noise and impulse noise (PI) at the first input of phase detector 22 receives the total output signal of the amplitude limiter 17, and to the second input of phase detector 22 is about is giving at the output of the lowpass filter (LPF) 19 voltage noise.

In case of exceeding the threshold comparator 26 at its output a signal of the ban, which covers the key 21 and the signal impressed FE" does not pass to the input of the demodulator 16 for the duration of PI. Thus, the demodulator 16 is not released from the condition of synchronism for the duration of PI.

In case of absence at the input of the PI at the output of the comparator 26, the prohibition signal is absent and the key 21 is opened.

At the time of analysis jamming environment and generate a signal control key 21 is necessary to detain the total signal processing channel with an angular modulation. At the same time it is necessary to delay and the differential signal in the other channel, which serve as delay lines 24 and 25. The delay lines 24 and 25 is selected are the same. This time is mainly determined by the bandwidth of the LPF 19.

From the output of the synchronous detector 15, the signal is narrowband low-pass filter 18, which is allocated a permanent component, the sign of which depends on the sign of the angle of misalignment . Output from the LPF 18 this component is supplied to the control unit the position of the axes of polarization of irradiators (pathogens) that rotates irradiators so that the angle becomes zero. When Russ is you in the opposite direction.

Low-pass filter 18 has a bandwidth substantially less than the width of the spectrum of functions. Therefore, low-pass filter 18 can pass only slowly changing signals, due to changes of the relative position of the antenna.

The control unit 20 with the voltage removed from the low-pass filter 18 eliminates misalignment between the polarization of the incoming signals and polarization irradiators receiving antenna. When this control system operates on the received signal, carrying information about the transmitted messages.

The device prototype inherent bandwidth of the transmitted information.

To eliminate this drawback in the device containing on the transmission side signal generator, the input of which is input to the main information, the first and second amplitude modulators, the second inputs of which are connected with the first and second outputs of opposite phase of the amplifier, respectively, the inlet of which is the entrance for more information SSSand the outputs of the amplitude modulators are connected with the first and second horn of the transmitting antenna, respectively; at the receiving side, the first and second irradiators receiving antenna through the block m of the adder and to the first and second inputs of vicites total differential unit, respectively, thus the output of the adder connected to the input of the amplitude limiter; and a second lowpass filter, demodulator key messages, the output of which is output to the main information S0synchronous detector, the first output of which through the first low pass filter connected with the control input of the control unit the position of the axes of polarization of irradiators receiving antenna imposed on the transmission side of the first and second power splitters, the inputs of which are connected with the output of the signal generator, the first outputs of both power divider connected to the signal inputs of the first and second keys, respectively. The second output of the first power splitter is connected to the signal input of the fourth key, the control input which is input to the information S1and coupled with the control input of the first key directly and also through an inverter to the control inputs of the second and third keys; the second output of the second power splitter is connected to the signal input of the third key; the outputs of the first and second keys are attached to first and second inputs of the first adder of the transmitter, the output of which is connected to a high frequency input of the first amplit the ladies of the second adder transmitter, the output of which is connected to a high frequency input of the second amplitude modulator. At the receiving side entered the demodulator amplitude-modulated signal, the output of which is the output data S1and his entrance through the amplitude limiter connected to the input of demodulator key messages and to the first input of a synchronous detector, a second input connected to the output of myCitadel, and the second output of the synchronous detector is connected to the input of the second low pass filter, the output of which is output to the additional information SSS.

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

1 signal generator;

2 - inverter;

3 and 4, the first and second amplitude modulators;

5 - out-of-phase (two-rail) amplifier;

6 and 7, the first and second irradiators transmitting antenna;

8 - transmit antenna;

9 and 10, the first and second agents of the receiving antenna.

11 - receiving antenna;

12 - sum-dierence block;

13 - adder;

14 - myCitadel;

15 - a synchronous detector;

16 - demodulator primary message;

17 - amplitude limiter;

18 and 19, the first and second filters modulator amplitude-modulated signal;

22 and 23, the first and second power splitters;

24, 25, 26 and 27 of the first, second, third and fourth keys;

28 and 29, the first and second adders transmitter.

The proposed device has the following functional relationships: on the transmission side signal generator 1, the inlet of which is the entrance to the main information S0and the output is connected to inputs of the first 22 and second 23 power divider, the first outputs of which are connected respectively with the signal inputs of the first 24 and second 25 keys; the second, managed, inputs of the first 24 and 27 fourth keys are connected together and to the input of the inverter 2 are input to the information S1the second output of the first power divider 22 is connected to the signal input of the fourth key 27; managed the input of the second key 25 is connected with the control input of the third key 26 and the output of the inverter 2; signal input of the third key 26 is connected with the second output of the second power splitter 23; the outputs of the first 24 and second 25 keys are connected respectively with the first and second inputs of the first adder 28, and outputs the third 26 and fourth 27 keys are connected respectively with the first and second inputs of the second adder 29, the output of which is connected to the first Vyasa antenna 8; the output of the first adder 28 is connected to the first high-frequency input of the first amplitude modulator 3, the output of which is connected to the first irradiator 6 of the transmitting antenna 8; the second inputs of the first 3 and second 4 amplitude modulators are connected respectively with the first and second outputs of opposite phase of the amplifier 5, the inlet of which is the entrance for more information SSS; at the receiving side first 9 and second 10 agents of the receiving antenna 11 via the control unit the position of the axes of polarization of irradiators receiving antenna 20 are connected respectively with the first and second inputs of the adder 13 and myCitadel 14 total differential unit 12; the output of the adder 13 is connected to the input of the amplitude limiter 17 and demodulator amplitude-modulated signal 21, the output of which is output to the information S1and the output of the amplitude limiter 17 is connected to the first input of the synchronous detector 15 and the input of the demodulator primary message 16, the output of which is output to the main information S0; second input of the synchronous detector 15 is connected to the output of vicites 14 total differential unit 12, the first output of the synchronous detector 15 through the first low pass filter 1, the second output of the synchronous detector 15 is connected to the input of the second low pass filter 19, the output of which is output to the additional information SSS.

The proposed device is as follows.

The signal generator 1 generates a signal to the main message, modulated in frequency or phase, the main message.

This signal is

uc(t) = ucos[t+(t)],

where uc- constant signal amplitude;

(t) is a function of the phase change signal corresponding to a frequency or phase modulation of the main messages S0;

angular frequency.

This signal is applied to the input of the power divider 22 and 23. Let us assume that the first divider 22 divides the power in half, and the second 23 - 0.75.

The main signal information S0to the input of the signal generator 1. Information S1(third information) is controlled inputs of the first 24 and 27 fourth of the keys and the input of the inverter 2. If information S1unit opens the first 24 and 27 fourth keys, thereby passing the signal from the outputs of the first power divider 22. If information S1zero inverter 2 inverts it into the unit, and those of shadow the first 24 and second 25 keys added in the first adder 28, and a signal from the outputs of the third 26 and fourth 27 keys added in the second adder 29. The waveforms at the outputs of the first 28 and second 29 adders shown in Fig.3. From the outputs of the adders 28 and 29, the signal is supplied respectively to the first high-frequency inputs of the first 3 and second 4 amplitude modulators, made in the form of high-frequency amplifiers. In them the amplitude of the transmitted signals is changed in opposite phase according to the law passed additional messages SSSusing the voltage charged to out-of-phase amplifier 5. Further, the signal outputs of the amplitude modulators are fed to the inputs of irradiators 6 and 7 of the transmitting antenna 8 and is radiated into space. Irradiators 6 and 7 create fields with orthogonal one with respect to another linear or circular polarization. The signals emitted by the transmitting antenna 8, are receiving antenna 11. Its agents 9 and 10 are mutually orthogonal linear or circular polarization. With agents of the receiving antenna, the signal is sent to the adder 13 and myCitadel 14. From the adder 13 a received signal at the demodulator 21, from which is removed the envelope of the amplitude-modulated signal information S1. From the adder 13, moreover, the signal postmaster primary message 16, with who is the main information S0. This same signal is supplied to the first input of the synchronous detector 15, to the second input of which is applied the signal from myCitadel 14. From the first output of the synchronous detector through the first low-pass filter 18 is fed to the control input of the control unit the position of the axes of polarization of 20, and through the second low-pass filter 19 is removed additional information SSS.

Radio system with reuse of frequencies containing on the transmission side signal generator, the input of which is input to the main information, the first and second amplitude modulators, the second inputs of which are connected with the first and second outputs of opposite phase of the amplifier, respectively, the inlet of which is the entrance for more information S supplementary , and the outputs of the amplitude modulators are connected with the first and second horn of the transmitting antenna, respectively, at the receiving side, the first and second irradiators receiving antenna via the control unit the position of the axes of polarization of irradiators receiving antenna attached to the first and second inputs of the adder and the first and second inputs of vicites total differential unit, respectively, while the output of the adder is connected to Vodolaga is output to the main information Sosynchronous detector, the first output of which through the first low pass filter connected with the control input of the control unit the position of the axes of polarization of irradiators receiving antenna, characterized in that on the transmission side entered the first and second power splitters, the inputs of which are connected with the output of the signal generator, the first outputs of both power divider connected to the signal inputs of the first and second keys, respectively, the second output of the first power splitter is connected to the signal input of the fourth key, the control input which is input to the information S1and connected with the control input of the first key directly and also through an inverter with control inputs of the second and third keys, the second output of the second power splitter is connected to the signal input of the third key, the outputs of the first and second keys are attached respectively to first and second inputs of the first adder of the transmitter, the output of which is connected to a high frequency input of the first amplitude modulator, and outputs the third and fourth keys are attached respectively to first and second inputs of the second adder transmitter, the output of which is connected to the modulated signal, the output which is the output data S1and his entrance through the amplitude limiter connected to the input of the demodulator key messages and to the first input of a synchronous detector, a second input connected to the output of myCitadel, and the second output of a synchronous detector connected to the input of the second low pass filter, the output of which is output to the additional information S additional

 

Same patents:

The invention relates to communication technology and can be used in synchronous or asynchronous address communication systems for sealing signals

The invention relates to electro - and radio and can be used for sealing wire, radio, microwave, optical and space lines of communication

The invention relates to telecommunication

The invention relates to computing and communications

The invention relates to electrical connections and may be used to separate channels in communication systems discrete information on parallel channels

The invention relates to techniques for transmitting digital data and can be used in the transmission systems of discrete data with a code multiplexing of signals

The invention relates to telecommunication and can be used in communication systems with parallel transmission of information, also for sealing wire, radio relay and satellite communication lines

Line radio // 2160503
The invention relates to radio communications and can be used in space and terrestrial communication systems using spatial modulation

The invention relates to the field of frequency synthesis and can be used in the frequency synthesizer with a fractional value of the division factor

The invention relates to antenna arrays

The invention relates to telecommunication systems and can be used in the radio links with reuse frequency (PMP)

The invention relates to radio communications and can be used in space and terrestrial radio links

FIELD: communications engineering.

SUBSTANCE: proposed system has user terminal, gateway, and plurality of beam sources radiating plurality of beams, communication line between user terminal and gateway being set for one or more beams. Proposed method is based on protocol of message exchange between gateway and user. Depending on messages sent from user to gateway, preferably on pre-chosen periodic basis, gateway determines most suited beam or beams to be transferred to user. Messages sent from user to gateway incorporate values which are, essentially, beam intensities measured at user's. Gateway uses beam intensities measured at user's to choose those of them suited to given user. Beams to be used are those capable of reducing rate of call failure and ensuring desired separation level of beam sources.

EFFECT: reduced rate of call failure in multibeam communication system.

20 cl, 27 dwg

FIELD: automatic adaptive high frequency packet radio communications.

SUBSTANCE: each high frequency ground station contains at least one additional high frequency receiver for "surface to surface" communication and at least one additional "surface to surface" demodulator of one-tone multi-positional phase-manipulated signal, output of which is connected to additional information input of high frequency controller of ground station, and input is connected to output of additional high frequency "surface to surface" receiver, information input of which is connected to common high frequency receiving antenna, while control input is connected to additional control output of high frequency controller of ground station.

EFFECT: prevented disconnection from "air to surface" data exchange system of technically operable high frequency ground stations which became inaccessible for ground communications sub-system for due to various reasons, and also provision of possible connection to high frequency "air to surface" data exchange system of high frequency ground stations, having no access to ground communication network due to absence of ground communication infrastructure at remote locations, where these high frequency ground stations are positioned.

2 cl, 12 dwg, 2 tbl

Up!