JP2001044907A - Microwave communication equipment having multipolarization interference rejection circuit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a multipolarization interference rejection circuit capable of transmitting a triple signal in the same frequency. SOLUTION: Modulators 1A to 1C of a transmitter T modulate a main signal, frequency converters 2A to 2C perform frequency conversion, a transmitting antenna 3 subsequently transmits three waves obtained by mutually shifting polarization planes by about 60 degrees, each of frequency converters 5A to 5C performs the frequency conversion of the received signal in a receiver R and subsequently outputs the received signal to each of mixers 6A to 6C, at the same time, outputs of frequency converters 5B and 5C are inputted to an interference rejection signal generating device 7A. Further, the outputs of the converters 5A and 5C are inputted to an interference rejection signal generating device 7B, the outputs of the converters 5A and 5B are inputted to an interference rejection signal generating device 7C, the devices 7A to 7C output mutually leaked-in interference rejection signals for interference signal rejection to each of the mixers 6A to 6C, and each of the mixers 6A to 6C eliminates the interference signal from the main signal outputted from the converters 2A to 2C.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a communication apparatus including a multi-polarization interference canceling circuit using microwaves, which uses three waves whose polarization planes are shifted from each other by about 60 degrees or two waves whose polarization planes are shifted by 90 degrees. , A multi-polarization interference cancel circuit with a multi-polarization interference canceling circuit, which receives a transmitted signal on the same polarization plane, and further removes an interference signal leaked from each other by an interference canceling signal generator to extract a main signal. The present invention relates to a wave communication device.

[0002]

2. Description of the Related Art In microwave communication devices, it is necessary to use limited frequency resources effectively.
An orthogonal polarization wireless communication system in which different signals are transmitted by using two orthogonal polarizations having the same frequency and which use the same frequency twice is known. There are disadvantages in that it is necessary to sufficiently obtain the cross polarization discrimination between the polarizations, and the cross polarization discrimination is deteriorated due to multipath, fading, and weather conditions. Therefore, various cross-polarization compensators have been proposed in the past, but in digital wireless systems, the interference state of the cross-polarization discrimination time fluctuates due to multipath and fading, and a transversal filter was used. An automatic equalizer is used for this cross polarization compensation method.

However, in the cross-polarization compensation system using such an automatic equalizer, the local oscillation frequency of a mixer for mixing a carrier wave is mixed on the transmission side in two systems of a vertical polarization system and a horizontal polarization system. Synchronization is not achieved, and an interference wave is generated between the main polarization and interference waves from different polarizations on the receiving side. In order to remove this interference wave, the above-mentioned transversal filter is used. However, if the operation of the transversal filter is slow and the frequency difference between the main signal and the interference signal is large in the baseband signal, sufficient compensation is required. The function cannot be exhibited.

Accordingly, for example, Japanese Patent Application Laid-Open No. 63-2225
No. 3, JP-A-63-22254 discloses that such a problem is solved.
For example, Japanese Unexamined Patent Publication No. 63-22253 discloses that the local oscillation frequency to the modulator on the transmitting side and the mixer for mixing the carrier wave is not synchronized with both the vertically polarized wave and the horizontally polarized wave. In order to remove the cross-polarization interference wave on the receiver side, a compensation demodulator for outputting a cross-polarization interference component compensation signal based on the intermediate frequency band signal is provided. It is disclosed to combine the compensated signal and the demodulated signal on the polarization side that has been subjected to cross-polarization interference.

Japanese Patent Laid-Open Publication No. Sho 61-24339 discloses a quadrature polarized radio that transmits different information between a transmitting station and a receiving station using vertical and horizontal polarized waves having the same frequency and orthogonal to each other. In the cross polarization compensation system on the receiving station side in the communication system, the first receiver receives the first signal of the first carrier frequency with vertical polarization transmitted from the transmitter, and the second receiver receives the first signal of the first carrier frequency. Receiving a second signal at a second carrier frequency that is slightly different from the first carrier frequency in polarization;
A beat frequency is generated by the reference beat generating means from the received signal and the second received signal of the second receiver, and the beat frequency component of the first received signal and the second received signal detected by the beat detecting means is compensated for coupling. It is disclosed that a control signal of the means is generated by a control signal generating means and the control means controls the output of the beat detecting means to be minimized.

[0006]

However, in the prior art of a communication apparatus including a multi-polarization interference canceling function using microwaves, there are only two types of vertical polarization and horizontal polarization. However, there is a problem that only two different signals can be handled. Moreover, as described above, in a microwave communication device, it is necessary to effectively use limited frequency resources, and development is urgently required in multi-channels on a polarization plane in accordance with multiplexing in a modulation method. However, it does not meet expectations from the viewpoint of effectively using limited frequency resources.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems, and transmits using a plurality of polarization signals of the same frequency, the polarization planes of which are shifted from each other by a predetermined angle, and the reception side uses the same polarization plane. A microwave with a multi-polarization interference elimination circuit that can transmit a plurality of signals at the same frequency by extracting the main signal from which the interference signals leaked by the interference elimination signal generator are received and extracted. It is an object to provide a communication device.

[0008]

In order to achieve the above object, a microwave communication apparatus with a multi-polarization interference canceling circuit according to the present invention modulates and frequency-converts a main signal for microwave transmission to obtain a main signal. And a transmission device including a plurality of transmission systems that respectively transmit a plurality of different polarization signals whose polarization planes are shifted from each other by a predetermined angle at the same frequency from a transmission antenna, and a main signal and a plurality of different polarizations transmitted from the transmission device. The signals are received by the receiving antennas, and after the frequency conversion, an interference cancellation signal generator is used to generate an interference cancellation signal for removing interference of different polarizations. And a receiving device including a plurality of receiving systems for extracting a main signal by removing the leaked interference signal and demodulating the main signal. for that reason,
In the plurality of transmission systems of the transmission device, the main signal for microwave transmission is modulated and frequency-converted, and the main signal and a plurality of different polarization signals having the same frequency and a polarization plane shifted from each other by a predetermined angle are respectively received from the transmission antenna. The signal is transmitted toward the receiving antenna of the device, received by the receiving antenna of the receiving device on the same polarization plane, and after the main signal and the different polarization are frequency-converted, the interference signals leaking to each other are input to the interference cancellation signal generating device. As a result, an interference wave elimination signal is generated, and the interference signal is mixed with a main signal including an interference signal leaked to each other to extract a main signal and demodulate the main signal. Multiple signals can be transmitted at frequencies.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of a microwave communication apparatus with a multi-polarization interference removal circuit according to the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing the overall configuration of the first embodiment according to the present invention. The first embodiment shown in FIG. 1 illustrates a case where three waves whose polarization planes are shifted from each other by 60 degrees are used. Accordingly, a transmitting device T and a receiving device R are provided, and the transmitting device T is composed of a first transmitting system TA to a third transmitting system TC, and the receiving device R is also a first receiving system RA to a third receiving system. RC
It is composed of

The first transmitting system T in the transmitting device T
The A to third transmission systems TC have the same configuration, and the first reception system RA to the third reception system RC have the same configuration. The first transmission system TA outputs an output signal of the modulator 1A that modulates the main signal to be transmitted to the frequency converter 2A. The local oscillation circuit LO is connected to the frequency converter 2A.
A is configured to receive a local oscillation signal from A, perform frequency conversion of an output signal of the modulator 1A, and output the converted signal to a polarization 1 feed horn 3A2 (see FIGS. 2 and 3 described later) of the antenna 3. I have. Although FIG. 1 shows that an antenna is used for each of the first transmission system TA to the third transmission system TC, a single transmission antenna 3 is actually used.

Since the second transmission system TB and the third transmission system TC have the same configuration, the same parts as those of the first transmission system TA are denoted by the same reference numerals and suffixes "B" and "C". The description of the configuration is omitted. As the transmitting antenna 3, a three-polarization type parabolic antenna is used, and the configuration is shown in FIGS. FIG. 2 is a top view of the three-polarization type parabolic antenna, and FIG. 3 is a front view thereof.

As is apparent from FIGS. 2 and 3, the transmitting antenna 3 has a polarization 2 feed horn 3A2 at the focal point of an antenna reflector 3A0 having a part of a rotating parabolic mirror as a reflecting mirror. Have been placed. A polarization 1 feed horn 3A1 and a polarization 3 feed horn 3A3 are arranged at target positions with respect to the polarization 2 feed horn 3A2. By arranging the transmitting antenna 3 in this manner, as is apparent from FIG.
It is possible to radiate three waves of polarized waves 1 to 3 shifted by degrees.

The output of the frequency converter 2 A of the first transmission system TA is supplied to the polarization 1 feed horn 3 A 1 of the transmission antenna 3, and the polarization 1 is radiated from the antenna 3. Further, the output of the frequency converter 2B of the second transmission system TB of the transmission device T is supplied to the polarization 2 feed horn 3A2 of the transmission antenna 3, and the polarization 2 is radiated from the antenna 3. . Further, the output of the frequency converter 2C of the third transmission system TC of the transmission device T is supplied to the polarization 3 feed horn 3A3 of the transmission antenna 3, and the polarization 3 is radiated from the antenna 3. .

On the other hand, the first to third receiving systems RA to RC of the receiving device R are also provided with the receiving antennas 4 respectively. Although FIG. 1 shows that the receiving antenna 4 is provided for each of the first to third receiving systems RA to RC, actually, the receiving device R is provided with one antenna 4. The receiving antenna 4 receives the polarized waves 1 to 3 radiated from the transmitting antenna 3 with a shift of 60 degrees.

By configuring the transmitting antenna 3 as described above, the polarized waves 1 to 3 are radiated from the transmitting antenna 3 to the receiving antenna 4 of the receiving device R as shown in FIG. . That is, the polarized wave 1 is radiated from the polarized wave 1 feed horn 3A1 of the transmitting antenna 3 and received by the receiving antenna 4 with the same polarization plane shifted by 60 degrees, so that the polarized wave 1 is transmitted to the first side of the receiving apparatus R. Reception system RA to third reception system R
Input to the C frequency converters 5A to 5C.

The polarization 2 is radiated from the polarization 2 feed horn 3A2 of the transmission antenna 3, and
Are received at the same polarization plane with a shift of 60 degrees, and the first receiving system RA ~
The signals are input to the frequency converters 5A to 5C of the third reception system RC. Further, the polarized wave 3 is radiated from the polarized wave 3 feed horn 3A3 of the transmitting antenna 3, and
At the same plane of polarization, the signal is received with a shift of 60 degrees.
Reception system RA to frequency converter 5A of third reception system RC
5C.

In the first embodiment, the receiving device R
As described above, three systems of the first to third receiving systems RA to RC are incorporated by using three waves whose polarization planes are shifted from each other by 60 degrees. This first receiving system RA to third receiving system
In the receiving system RC, a local oscillation signal is supplied from a common local oscillation circuit LOR to each of the frequency converters 5A to 5C, and the frequency converters 5A to 5C perform frequency conversion of the input polarized waves 1 to 3. .

The signals of the polarized waves 1 to 3 whose frequencies have been converted by the respective frequency converters 5A to 5C are respectively transmitted to the first receiving system R
A to the mixers 6A to 6C of the third reception system RC.
The output signal of the frequency converter 5A is input to the interference cancellation signal generator 7B of the second reception system RB and the interference cancellation signal generator 7C of the third reception system RC. The output signal of the frequency converter 5B is output to the interference cancellation signal generator 7A of the first reception system RA and the interference cancellation signal generator 7 of the third reception system RC.
Input to C. The output signal of the frequency converter 5C is
The signal is input to the interference cancellation signal generator 7A of the first reception system RA and the interference cancellation signal generator 7B of the second reception system RB.

These interference removal signal generators 7A to 7C
In order to remove the other two systems of the same frequency and different polarization interference waves leaked from each other except for the reception system to which they belong, the interference systems receive the interference waves as the main signals. Is generated to output an interference cancellation signal 13a to the mixer 6A. Interference cancellation signal generator 7
Similarly, from B, an interference wave removal signal 13b is generated to remove the interference wave and output to the mixer 6B. Similarly, an interference wave elimination signal 13c is generated from the interference elimination signal generation device 7C and is output to the mixer 6C in order to eliminate the interference wave.

The mixer 6A is provided with the interference canceling signal generator 7
A, the interference signal 10a output from the frequency converter 5A and the interference signal 10a output from the frequency converter 5A.
b is mixed and output to the demodulator 8A. Second receiving system R
B mixer 6B includes an interference wave cancellation signal 13b output from interference cancellation signal generator 7B and frequency converter 5B.
A reception signal 11A and an interference signal 11b, which are output signals of B, are input.

Similarly, the mixer 6C of the third receiving system RC
Is input with the interference wave elimination signal 13c extracted from the interference elimination signal generator 7C and the reception signal 12a and the interference signal 12b which are the output signals of the frequency converter 5C.
The demodulators 8A to 8C demodulate the output signals of the mixers 6A to 6C, respectively, to remove the interference wave, that is, the received signals,
It is configured to output data or audio signals.

Next, the operation of the first embodiment configured as described above will be described. The modulators 1A to 1C of the first transmission system TA to the third transmission system TC of the transmission device T respectively modulate a voice signal or data as a main signal to be transmitted, and output the modulated signals to the frequency converters 2A to 2C. Each of the frequency converters 2A to 2C has a local oscillation circuit L
A local oscillation signal is input from OA to LOC, and each of the frequency converters 2A to 2C performs frequency conversion of an output signal of each of the modulators 1A to 1C according to the local oscillation signal, and outputs a polarization 1 feed horn of the transmission antenna 3. 3A1 to the polarization 3 feed horn 3A3.

As a result, the polarized light is radiated from the transmitting antenna 3 toward the receiving antenna 4 with the polarization planes being shifted by 60 degrees from each other by the polarization 1 feed horn 3A1 to the polarization 3 feed horn 3A3 of the transmitting antenna 3. The receiving antenna 4 receives these polarized waves 1 to 3 and inputs them to the frequency converters 5A to 5C of the first to third receiving systems RA to RC, respectively. Each frequency converter 5
Since local oscillation signals from the common local oscillation circuit LOR are input to A to 5C, the local oscillation signals are frequency-converted with the local oscillation signals.

The output signal subjected to frequency conversion by the frequency converter 5A is sent to a mixer 6A, an interference cancellation signal generator 7B of the second reception system RB, and an interference cancellation signal generator 7C of the third reception system RC. The output signal of the frequency converter 5A includes the reception signal 10a and the interference signal 10b. The received signal 10a and the interference signal 10b are
Is input to the interference cancellation signal generator 7B and the interference cancellation signal generator 7C.

Similarly, the frequency-converted output signal of the frequency converter 5B is output to the mixer 6B and the first receiving system R
The signal is transmitted to the interference canceling signal generator 7A of A and the interference canceling signal generator 7C of the third receiving system RC. The output signal of the frequency converter 5B includes a reception signal 11a and an interference signal 11b.
It is included. The received signal 11a and the interference signal 11b
c is input to the mixer 6B, the interference cancellation signal generator 7B, and the interference cancellation signal generator 7C.

Further, the output signal subjected to frequency conversion by the frequency converter 5C is sent to a mixer 6C, an interference cancellation signal generator 7A of the first reception system RA, and an interference cancellation signal generator 7B of the second reception system RB. . Frequency converter 5C
Output signal includes a reception signal 12a and an interference signal 12b. The received signal 12a and the interference signal 12a are input to the mixer 6B, the interference cancellation signal generator 7A, and the interference cancellation signal generator 7B.

An interference cancellation signal generator 7 for the first receiving system RA
In A, in addition to the reception signals 11a and 12a of the second reception system RB and the third reception system RC, interference signals 11b and 12b
Is entered. The interference cancellation signal generator 7A combines the interference signals 11b and 12b to generate the interference cancellation signal 13b.
a is generated and output to the mixer 6A. As a result, the mixer 6A mixes the signal including the reception signal 10a and the interference signal 10b output from the frequency converter 5A with the interference cancellation signal 13a generated by the interference cancellation signal generator 7A, and performs interference from the reception signal 10a. The received signal 10a from which the signal 10b has been removed is output to the demodulator 8A. Demodulator 8A demodulates received signal 10a and outputs signal 14a after interference removal.

In the interference cancellation signal generator 7B of the second receiving system RB, the first receiving system RA and the third receiving system RC
, And interference signals 10b and 12b are input. In the interference cancellation signal generator 7B,
These interference signals 10b and 12b are combined to generate an interference elimination signal 13b, which is output to the mixer 6A. As a result, the mixer 6B mixes the signal including the reception signal 11a and the interference signal 11b output from the frequency converter 5B with the interference cancellation signal 13b generated by the interference cancellation signal generator 7A, and generates an interference signal from the reception signal 11a. The received signal 11a from which the signal 11b has been removed is output to the demodulator 8B. The demodulator 8B demodulates the received signal 11a and outputs the signal 1 after the interference removal.
4b is output.

In exactly the same manner, in the interference canceling signal generator 7C of the third receiving system RC, in addition to the receiving signals 10a and 11a of the first receiving system RA and the second receiving system RB, the interference signals 10b and 11b Is entered. The interference elimination signal generator 7C combines the interference signals 10b and 12b to generate an interference elimination signal 13c and outputs the generated signal to the mixer 6C. As a result, the mixer 6C mixes the signal including the reception signal 12a and the interference signal 12b output from the frequency converter 5C with the interference cancellation signal 13c generated by the interference cancellation signal generator 7A, and performs interference from the reception signal 12a. The received signal 12a from which the signal 12b has been removed is output to the demodulator 8C. Demodulator 8C demodulates received signal 12a and outputs signal 14c after interference removal.

As described above, in the first embodiment, in a communication device including a multi-polarization interference canceling device using microwaves, three waves whose polarization planes are shifted from each other by about 60 degrees are used.
The transmitted signals are received on the same polarization plane, respectively.
Since the interference signals leaked from each other are removed, it is possible to transmit a triple signal at the same frequency.

Next, a second embodiment of the present invention will be described. In the first embodiment, as an example of transmitting and receiving a plurality of polarization planes whose polarization planes are shifted from each other by a predetermined angle, a case where three waves whose polarization planes are shifted from each other by about 60 degrees is used. Is not limited to this. In the second embodiment, in a communication apparatus including a multi-polarization interference canceller using microwaves, two waves whose polarization planes are shifted from each other by about 90 degrees are used for transmission. The signal
Interference signals received on the same polarization plane and leaked to each other can be removed.

FIGS. 4 and 5 show a transmitting antenna 3 applied to the second embodiment. FIG. 4 is a top view and FIG. 5 is a front view. As shown in FIGS. 4 and 5, the second
In the embodiment, it is possible to receive signals transmitted using the two waves whose polarization planes are shifted from each other by about 90 degrees as described above, receive the same signals on the same polarization plane, and remove interference signals leaked to each other. In order to be able to do so,
Only two of A1 and the polarization 2 feed horn 3A2 are used. The transmitting device T is composed of a first transmitting system and a second transmitting system, and the receiving device R is also composed of a first receiving system and a second receiving system. The configuration of each system is the same as that of FIG. .

As described above, since the receiving device R is composed of two systems, the first receiving system and the second receiving system, the interference canceling signal generating device of the first receiving system can receive the interference with the received signal of the second receiving system. A signal is input, and a reception signal and an interference signal of the first reception system are input to the interference cancellation signal generation device of the second reception system.
The cancellation signal is output from the interference cancellation signal generator of the reception system to the mixer of the first reception system, and the cancellation signal is output to the mixer of the second reception system from the interference cancellation signal generation device of the second reception system. By doing so, similarly to the first embodiment, the received signals from which the interference signals leaked from each other are removed are output from the respective mixers.

[0034]

As described above, according to the present invention, signals transmitted using a plurality of waves whose polarization planes are shifted from each other by a predetermined angle are received on the same polarization plane, and interference signals leaked to each other are received. By inputting the signal to the interference canceling signal generator, a canceling signal for canceling the interference wave is generated, and the canceling signal is used to cancel the interference signal included in the received signal. Signals can be transmitted.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a configuration of a first embodiment of a microwave communication device with a multi-polarization interference removal circuit according to the present invention.

FIG. 2 is a top view of a transmission antenna applied to the first embodiment of the microwave communication device with a multi-polarization interference removal circuit according to the present invention.

FIG. 3 is a front view of a transmission antenna applied to the first embodiment of the microwave communication device with a multi-polarization interference removal circuit according to the present invention.

FIG. 4 is a top view of a transmitting antenna applied to a second embodiment of the microwave communication device with a multi-polarization interference removal circuit according to the present invention.

FIG. 5 is a front view of a transmitting antenna applied to a second embodiment of the microwave communication device with a multi-polarization interference removal circuit according to the present invention.

[Explanation of symbols]

1A to 1C: modulator, 2A to 2C, 5A to 5C: frequency converter, 3: transmission antenna, 3A0 ... antenna reflector, 3A1 ... feed horn for polarization 1,
3A2 ... Polarization 2 feed horn, 3A3 ... Polarization 3
Feed horn, 4 ... Reception antenna, 6A-6C ...
... Mixers, 7A to 7C ... Interference cancellation signal generators, 8A
... 8C ... demodulator, 10a-12a ... reception signal, 10
b to 12b: interference signal, 13a to 13c: interference removal signal, 14a to 14c: signal after interference removal, LOA to L
OC, LOR: local oscillation circuit, R: receiving device, RA
... first receiving system, RB ... second receiving system, RC ... third receiving system, T ... transmitting device, TA ... first transmitting system, TB ...
Second transmission system, TC... Third transmission system.

Claims (7)

[Claims] A plurality of transmissions for modulating and frequency-converting a main signal for transmitting microwaves and transmitting a plurality of differently polarized signals having the same frequency and a polarization plane shifted from each other by a predetermined angle from a transmission antenna. A transmission device including a system, a main signal and a plurality of different polarization signals transmitted from the transmission device are respectively received by a reception antenna, and a frequency-converted interference cancellation signal generation device removes interference of frequency different polarization. Receiving signal including a plurality of receiving systems for extracting the main signal by removing the mutually leaked interference signals included in the main signal by the interference wave removing signal, and demodulating the main signal. A microwave communication device with a multi-polarization interference removal circuit, comprising: a device; 2. A transmitting apparatus comprising: a first modulator for modulating a main signal for transmitting microwaves; and an output frequency of the first modulator, which is frequency-converted by a first frequency converter. A first method of transmitting two different polarization signals whose polarization planes are shifted from each other by 90 degrees from a transmission antenna, respectively.
A transmitting system and a second modulating main signal for transmitting microwaves;
A modulator and an output frequency of the second modulator are frequency-converted by a second frequency converter, and a main signal and two different polarization signals having the same frequency and a polarization plane shifted by 90 degrees from each other are transmitted from a transmission antenna. 2. The microwave communication device with a multi-polarization interference removal circuit according to claim 1, comprising two transmission systems. 3. The transmitting antenna receives the output of the antenna reflector and the first transmitting system and radiates a main signal and two differently polarized signals having the same frequency and two polarization planes shifted from each other by 90 degrees. And a second polarization feed horn for receiving the output of the second transmission system and radiating a main signal and two different polarization signals having the same frequency and a polarization plane shifted by 90 degrees from each other. 3. The microwave communication device with a multi-polarization interference removal circuit according to claim 2, further comprising a wave feed horn. 4. The receiving device according to claim 1, further comprising: a main signal of the first transmission system and the second transmission system radiated from the transmission antenna; and a two-polarized signal having the same frequency and two polarization planes shifted from each other by 90 degrees. 1st frequency conversion by receiving with receiving antenna
Receives a first frequency converter of a receiving system, a main signal of the first transmitting system and a second transmitting system radiated from the transmitting antenna, and two differently polarized signals of the same frequency and having polarization planes shifted by 90 degrees from each other. A second frequency converter of a second receiving system for receiving and converting the frequency by an antenna, and an output signal of the second frequency converter, which is provided in the first receiving system and simultaneously receives an interference wave of the same frequency and different polarization, A first interference cancellation signal generation device that generates an interference wave cancellation signal for cancellation,
A second interference elimination signal generator provided in the second reception system, which receives an output signal of the first frequency converter and simultaneously generates an interference wave elimination signal for eliminating interference waves of the same frequency and different polarizations; , Provided in the first receiving system,
Mixing the main signal including the interference signal of the same frequency and different polarization leaked from the frequency converter and the interference wave elimination signal output from the first interference elimination signal generator, A first mixer that outputs a main signal from which a wave interference signal has been removed, and a first mixer that is provided in the second reception system,
A main signal including interference signals of the same frequency and different polarizations leaked from each other and output from the second frequency converter;
2. The apparatus according to claim 1, further comprising: a second mixer that mixes the interference wave elimination signal output from the interference elimination signal generator and outputs a main signal from which the interference signal of the same frequency and different polarization is eliminated. A microwave communication device with the multi-polarization interference removal circuit according to the above. 5. A transmitting apparatus comprising: a first modulator for modulating a main signal for transmitting a microwave; and a first frequency converter for converting an output frequency of the first modulator by a first frequency converter, and converting the output frequency with the main signal and the same frequency. A first method of transmitting three different polarization signals whose polarization planes are shifted from each other by 60 degrees from a transmission antenna, respectively.
A transmitting system and a second modulating main signal for transmitting microwaves;
A modulator and an output frequency of the second modulator are frequency-converted by a second frequency converter, and a main signal and three different polarization signals having the same frequency and a polarization plane shifted from each other by 60 degrees are transmitted from a transmission antenna. 2 transmission system, a third modulator for modulating a main signal for microwave transmission, and a third modulator
A third transmission system for converting the output frequency of the modulator by a third frequency converter and transmitting a main signal and three differently polarized signals having the same frequency and a polarization plane shifted by 60 degrees from a transmission antenna, respectively; 2. The method according to claim 1, wherein
A microwave communication device with a multi-polarization interference removal circuit according to the above. 6. The transmitting antenna receives the output of the antenna reflector and the first transmitting system and radiates a main signal and three differently polarized signals of the same frequency and having three polarization planes shifted from each other by 60 degrees. And a second polarization feed horn for inputting the output of the second transmission system and radiating a main signal and three different polarization signals having the same frequency and a polarization plane shifted by 60 degrees from each other. Wave feed horn, and a third polarization feed horn for receiving the output of the third transmission system and emitting a main signal and three differently polarized signals having the same frequency and a polarization plane shifted by 60 degrees from each other. 6. The microwave communication device with a multi-polarization interference removal circuit according to claim 5, comprising: 7. The receiving apparatus according to claim 1, further comprising: a main signal of the first to third transmitting systems radiated from the transmitting antenna and a three-polarized signal having the same frequency and a polarization plane shifted by 60 degrees from each other. 1st frequency conversion by receiving with receiving antenna
A first frequency converter of a receiving system, a main signal of the first to third transmitting systems radiated from the transmitting antenna, and three differently polarized signals of the same frequency and whose polarization planes are shifted by 60 degrees from each other. A second frequency converter of a second reception system for receiving and converting the frequency by an antenna, and a main signal of the first transmission system to the third transmission system radiated from the transmission antenna and a polarization plane shifted by 60 degrees at the same frequency from each other. A third frequency converter of a third receiving system for receiving the three differently polarized signals by a receiving antenna and converting the frequency, and an output signal of the second frequency converter provided in the first receiving system and the third frequency converter. A first interference cancellation signal generating device for receiving an output signal of the frequency converter and simultaneously generating an interference wave cancellation signal for canceling an interference wave of the same frequency and different polarization, and provided in the second reception system; A second interference canceling signal generating apparatus that receives the output signal of the first frequency converter and the output signal of the third frequency converter and simultaneously generates an interference wave canceling signal for canceling an interference wave of the same frequency and different polarization; And an interference wave eliminator provided in the third receiving system for inputting an output signal of the first frequency converter and an output signal of the second frequency converter and simultaneously removing an interference wave of the same frequency and different polarization. A third interference canceling signal generator for generating a signal, a main signal provided in the first receiving system and including an interference signal of the same frequency and different polarization leaked from the first frequency converter and output from the first frequency converter; (1) a first mixer that mixes the interference wave cancellation signal output from the interference cancellation signal generator and outputs a main signal from which the interference signal of the same frequency and different polarization has been eliminated, and is provided in the second reception system; , The main signal including the interference signals of the same frequency and different polarizations leaked from each other and output from the second frequency converter and the interference wave elimination signal output from the second interference elimination signal generating device are mixed to form the same signal. A second mixer for outputting a main signal from which an interference signal of a different frequency is removed, and an interference signal of the same frequency and different polarization provided in the third receiving system and leaked from the third frequency converter And a second mixer that mixes the main signal containing the same and the interference wave elimination signal output from the third interference elimination signal generator to output a main signal from which the interference signal of the same frequency and different polarization is eliminated. The microwave communication device with a multi-polarization interference removal circuit according to claim 1, wherein: