JPH02246538A - Cross polarization type radio system - Google Patents

Abstract

PURPOSE:To simplify the structure and to improve the reliability by using local oscillators in common at a transmission part and a reception part. CONSTITUTION:At the transmission part 100, modulators 9 and 10 for a main polarized signal and a cross-polarized signal and a transmitting circuits 11 and 12 for he main polarized signal and cross-polarized signal use a local oscillator 15 in common. At the reception part 101, on the other hand, a receiving circuit 23 for the main polarized signal and a receiving circuit 24 for the cross- polarized signal use a local oscillator 35 in common. Thus, the local oscillators 15 and 35 are used in common at the transmission part 100 and reception part 101, so the structure is simplified and the reliability is therefore improved.

Description

[Detailed Description of the Invention] [Table of Contents Overview Industrial Application Fields [Figure 5 (a), (b)] Prior Art (Figures 3 and 4) Problems to be Solved by the Invention Means for (Fig. 1) Effect (Fig. 1) Embodiment (Fig. 2) Effects of the invention [Summary] Information is transmitted separately into a main polarization signal and a cross-polarization signal in the same frequency band. Regarding a cross-polarized radio system having a cross-side wave interference compensator in the receiving section, the transmitting section and the receiving section each use a common local oscillator, thereby simplifying the structure and improving reliability. The purpose is to.

In the transmitting section, one of the modulators receives the first signal from the first local oscillator.
Modulation processing is performed based on a local oscillation signal.

The other side of the modulator receives the first local oscillation signal and performs modulation processing based on a signal from a PLL circuit that makes the same frequency as the first local oscillation signal, and each transmitting circuit receives the first local oscillation signal and makes the frequency multiplied by the PLL circuit. In the receiving section, one of the receiving circuits performs down-conversion processing based on the second local oscillation signal from the second local oscillator, and the other receiving circuit performs down-conversion processing based on the second local oscillation signal from the second local oscillator. The down-conversion process is performed based on a signal from a PLL circuit which receives a reproduced carrier wave signal from the second local oscillation signal and converts it into the same frequency as the second local oscillation signal.

[Industrial Application Field] The present invention transmits information by dividing it into a main polarization signal and a cross-polarization signal in the same frequency band, and installs a cross-side wave interference compensator (XPIC) in the receiving section. The present invention relates to a cross-polarized radio system having an interference canceller.

Generally, as a means of transmitting information using a main polarization signal and a cross polarization signal, as shown in FIG. There is an interleaving method that shifts the frequency band with the wave signal (for example, horizontal polarization; H polarization), but in recent years, as shown in Fig. A common channel method has been proposed in which information is transmitted separately into a V-polarized signal (V polarized wave) and a cross-polarized signal (eg, H polarized wave).

In such a common channel system, since the frequency bands of the main polarization signal and the cross-polarization signal are the same, a problem arises of interference between the main polarization signal and the cross-polarization signal. Therefore, in order to compensate for such cross-polarized interference, a cross-side wave interference compensator is provided in the receiving section.

[Prior Art] Next, as an example, regarding a cross-polarization wireless system having a transversal cross-polarization interference compensator,
This will be briefly explained using figures. That is, if the main polarization signal V and the cross-polarization signal H are radiated through the transmitting antenna 1 and received by the receiving antenna 2, then the cross-polarization signal H is transferred to the main polarization signal V on the wireless transmission path. Due to the interference, the main polarization received signal includes a cross polarization signal component. Therefore, the cross-polarized wave interference compensator 3 removes the cross-polarized signal component from this main polarized received signal.

Here, the cross-side wave interference compensator 3 includes a transversal filter 4 and a control circuit 5.

First, the transversal filter 4 transmits the cross-polarized signal H
A delay unit 4 having a plurality of delay circuits to sequentially delay the
A, a weighting section 4B that applies required weighting to the output from the delay section 4A, and an addition section 4C that adds each output from the 1-weighting section 4B. The output is subtracted from the main polarization signal V as a compensation signal by the subtracter 6 of the main polarization signal demodulator 8.

The control circuit 5 also includes a demodulator 7 that demodulates the cross-polarized signal H.
The shift register 5A receives the output of the shift register 5A as an input, and the correlator 5B receives the output of the shift register 5A and controls the weighting coefficient of the weighting section 4B.

The main polarization signal V, whose cross-polarization signal interference has been compensated for by the compensation signal in this way, is demodulated by the detection section and identification section of the demodulator 8.

In addition, since there is a possibility that the main polarization signal component is mixed with the cross-polarized signal, a cross-polarized interference compensation base is attached to the demodulator 7 for the cross-polarized signal, as described above. It's okay.

By the way, for the operation of the cross-polarization interference compensator 3, it is necessary to make the local oscillation frequency common between the main polarization signal V and the cross-polarization signal H. The cross-polarized radio system has a configuration as shown in FIG.

That is, the transmitter 100 is provided with a main polarization signal transmission system for the main polarization signal V and a cross polarization signal transmission system for the cross polarization signal H.

First, the main polarization signal transmission system includes a main polarization signal modulator 9 that performs modulation processing on the main polarization signal V, and a main polarization signal modulator 9 that modulates the modulation output from the main polarization signal modulator 9 to the transmission frequency. The cross-polarized signal transmission system includes a polarized signal transmission circuit 11 and a high-power amplifier (HPA) 13 that amplifies the signal from the main polarized signal transmission circuit 11. A cross-polarized signal modulator 10 that performs modulation processing on a cross-polarized signal H, and this cross-polarized signal modulator 1
It has a cross-polarized signal transmission circuit 12 that raises the modulated output from 0 to the transmission frequency, and a high-power amplifier (HPA) 14 that amplifies the signal from this cross-polarized signal transmission circuit 12. are doing.

A main polarization signal V and a cross-polarization signal H are emitted from each high-power amplifier 13, 14 through the transmitting antenna 1.

By the way, in this transmitter 100, for example, the main polarization signal modulator 9 is subjected to modulation processing based on the local oscillation signal from one local oscillator 15, and the cross-polarization signal modulator 1o is A modulation process is performed based on a signal from a modulating PLL circuit 16 which receives a local oscillation signal from the local oscillation signal 15 and makes it have the same frequency as the local oscillation signal.

Further, local oscillators 17 and 18 are attached to each of the main polarization signal transmission circuit 11 and the cross-polarization signal transmission circuit 12, and the local oscillation signals from these local oscillators 17 and 18 are transmitted to the switch 19. PLL circuit 21', 22' for each transmitting circuit 11.12 via .20
Therefore, under normal conditions, each PLL circuit 21'22' is driven based on the local oscillation signal from either one of the local oscillators 17 or 18, When one local oscillator 17 or 18 is abnormal, each PLL circuit 21', 22' is driven based on the local oscillation signal from the other local oscillator 18 or 17 by switching the switch 19.20. There is. As a result, the main polarization signal transmission circuit 11
and the cross-polarized signal transmission circuit 12 are each PLL
Up-conversion processing is performed based on the signals from the circuits 21' and 22'.

Note that each PLL circuit 21', 22' is an IFPLL circuit 21'A, 22' that generates a signal at an intermediate frequency level.
'A, and μPLL circuits 21'B and 22'B that generate signals in the microwave band. Then, as mentioned above, when one local oscillator 17 or 18 is abnormal,
The IFPLL circuits 21'A and 22' are connected so that the demodulator and further the μPLL circuits 21'B and 22'B do not become asynchronous.
'A serves as a buffer.

On the other hand, the receiving section 101 is provided with a main polarization signal receiving system for the main polarization signal V and a cross polarization signal receiving system for the cross polarization signal H.

First, the main polarization signal receiving system includes a main polarization signal reception circuit 23 that lowers the frequency of the main polarization reception signal received by the reception antenna 2, and a signal from this main polarization signal reception circuit 23. Main polarization signal demodulator 2 that performs demodulation processing
5 and a cross-polarization interference compensator 27 that reduces the cross-polarization signal component from the main polarization signal, and the cross-polarization signal receiving system is configured to reduce the cross-polarization signal component received by the receiving antenna 2. A cross-polarized signal receiving circuit 24 that lowers the frequency, a cross-polarized signal demodulator 26 that demodulates the signal from the cross-polarized signal receiving circuit 24, and a cross-polarized signal demodulator 26 that demodulates the signal from the cross-polarized signal to the main polarized signal component. It also has a cross sidewave interference compensator 28 that reduces the interference.

By the way, the main polarization signal receiving port 1 in the receiving section 101
Local oscillators 29 and 30 are attached to each of 23 and the cross-polarized signal transmission circuit 24, and the local oscillation signals from these local oscillators 29 and 30 are transmitted to the switch 31.
．． 32 to either of the PLL circuits 33 and 34 for the respective transmitting circuits 23 and 24. Therefore, under normal conditions, local oscillation from either one of the local oscillators 29 or 30 Each PLL based on the signal
The circuits 33 and 34 are driven, and when the - local oscillator 29 or 30 is abnormal, the switches 31 and 32 are switched, so that each PLL circuit 33 is activated based on the local oscillation signal from the other local oscillator 29 or 30. , 34 are driven. Thereby, the main polarization signal reception circuit 23 and the cross polarization signal transmission circuit 24 are subjected to down-conversion processing based on the signals from the PLL circuits 29 and 30, respectively.

The PLL circuits 29 and 30 each include IFPLL circuits 29A and 30A that generate intermediate frequency level signals, and μPLL circuits 29B and 30B that generate signals in the microwave band.
It is made up of. Also in this case, when one of the local oscillators 29 or 30 is abnormal as described above, the demodulator and the μPLL circuits 33B and 34B are prevented from becoming out of synchronization.

The IFPLL circuits 33A and 34A serve as buffers.

[Problems to be Solved by the Invention] However, in such a conventional cross-polarized radio system, one local oscillator is provided in the transmitting section, one in the modulating section and two in the transmitting circuit, and one local oscillator is provided in the receiving section.
Since two local oscillators are provided in the receiving circuit, there is a problem that the number of local oscillators increases and the overall configuration becomes complicated.

The present invention aims to solve these problems by using a common local oscillator in both the transmitting section and the receiving section, thereby simplifying the structure and improving reliability. . The purpose is to provide a cross-polarized radio system.

[Means to solve the problem] FIG. 1 is a block diagram of the principle of the present invention.

In this FIG. 1, 100 is a transmitter, and this transmitter 1
00 is the main polarization signal modulator 9. Modulator for cross-polarized signals 10. Main polarization signal transmission circuit 11, cross polarization signal transmission circuit 12. High power amplifier for main polarization signal 13. A high power amplifier 14 for cross-polarized signals and a transmission antenna 1 are provided.

Here, the main polarization signal modulator 9 performs modulation processing on the main polarization signal, and the cross polarization signal modulator 10
The main polarization signal transmission circuit 11 performs modulation processing on the cross-polarized signal, and the main polarization signal transmission circuit 11 performs up-conversion processing on the modulation output from the main polarization signal modulator 9 to the transmission frequency. The cross-polarized signal transmission circuit 12 performs processing to increase (up-convert) the modulated output from the cross-polarized signal modulator 10 to a transmission frequency.

The main polarization signal high power amplifier 13 and the cross polarization signal high power amplifier 14 amplify the main polarization signal and the cross shortwave signal to the transmission power, respectively.
transmits an amplified main polarization signal and a cross polarization signal.

Further, 15 is a first local oscillator, and 16 is a first local oscillator 1.
21. a modulation PLL circuit for receiving a first local oscillation signal from 5 and making it have the same frequency as the first local oscillation signal;
22 receives a first local oscillation signal from the first local oscillator 15 and converts the first local oscillation signal into a frequency that is multiplied by the first local oscillation signal. This is a PLL circuit for a second transmitting circuit.

10'1 is a receiving section, and this receiving section 101 includes a main polarization signal receiving circuit 23. Cross-polarized signal receiving circuit 24. Main polarization signal demodulator 25 with cross-polarization interference compensator 27. A main polarization signal demodulator 26 with a cross-side interwave interference compensator 28 is provided.

Here, the main polarization signal receiving circuit 23 performs a process of lowering (down converting) the frequency of the main polarization reception signal, and the cross polarization signal reception circuit 24 performs a process of lowering (down converting) the frequency of the main polarization reception signal. The main polarization signal demodulator 25 performs processing to lower the frequency (downconversion).
The demodulator 26 performs demodulation processing on the signal from the main polarization signal reception circuit 23, and the cross polarization signal demodulator 26 performs demodulation processing on the signal from the cross polarization signal reception circuit 24.

Note that the cross-polarization interference compensator 27 is for reducing the cross-polarization signal component from the main polarization signal, and the cross-polarization interference compensator 28 is for reducing the main polarization signal component from the cross-polarization signal. It is.

35 is a second local oscillator, 36 is a main polarization signal demodulator 25
A receiving circuit PLL for receiving the recovered carrier signal extracted by the cross-polarization signal demodulator 26 and the recovered carrier signal extracted by the cross-polarization signal demodulator 26 to make it have the same frequency as the second local oscillator signal.
It is a circuit.

[Function] In the above-described cross-polarized radio system of the present invention, one of the main polarization signal modulator and the cross-polarization signal modulator (for example, the main polarization signal modulator 9 ) is subjected to modulation processing based on the first local oscillator signal from the first local oscillator 15, and the other of the main polarization signal modulator and the cross polarization signal modulator (for example, the cross polarization signal modulation 10) receives a first local oscillator signal from a first local oscillator 15, performs modulation processing based on a signal from a modulation PLL circuit 16 to make the frequency the same as that of the first local oscillator signal, and further The main polarization signal transmission circuit 11 and the cross-polarization signal transmission circuit 12 each receive a first local oscillator signal from the first local oscillator 15 and generate a first local oscillator signal with a frequency multiplied by the first local oscillator signal. 1. Up-conversion processing is performed based on the signals from the second transmitting circuit PLL circuits 21 and 22.

In the receiving section 101, one of the main polarization signal receiving circuit and the cross polarization signal receiving circuit (for example, the main polarization signal receiving circuit 23) receives the second signal from the second local oscillator 35.
Down-conversion processing is performed based on the local oscillator signal, and the other of the main polarization signal reception circuit and the cross-polarization signal reception circuit (for example, the cross-polarization signal reception circuit 24)
is a receiving circuit for receiving the regenerated carrier wave signal taken out by the main polarization signal demodulator 25 and the regenerated carrier wave signal taken out by the cross polarization signal demodulator 26 to make it have the same frequency as the second local oscillator signal. A down-conversion process is performed based on the signal from the PLL circuit 36.

[Example] Hereinafter, the present invention will be described in detail with reference to the drawings.

FIG. 2 is a block diagram showing an embodiment of the present invention. In this FIG. A polarized signal transmission system and a cross-polarized signal transmission system for the horizontally polarized signal H as a cross-polarized signal are provided.

First, the main polarization signal transmission system includes a main polarization signal modulation 59, a main polarization signal transmission circuit 11. The cross-polarization signal transmission system includes a high-power amplifier (HPA) 13 and a transmission antenna 1, and the cross-polarization signal transmission system includes a cross-polarization signal modulator 10.
Transmission circuit for cross-polarized signals 12. It has a high power amplifier (HP A) 14 and a transmitting antenna 1.

Since the above configuration is the same as the conventional configuration shown in FIG. 3, explanation of each component will be omitted.

By the way, in this transmitter 100, the first local oscillator 15 is attached to the main polarization signal modulator 9, and the first local oscillator signal from the first local oscillator 15 is attached to the cross polarization signal modulator 10. A modulation PLL circuit 16 is provided to make the frequency the same as that of the first local oscillation signal, and a main polarization signal transmission circuit 11 and a cross polarization signal transmission circuit 12 are provided.
A first oscillator receives a first local oscillation signal from the first local oscillator 15 and multiplies the first local oscillation signal to a frequency. Second transmitting circuit PLL circuit 21.2
2 is attached.

Therefore, the main polarization signal modulator 9 is subjected to modulation processing based on the first local oscillation signal from the first local oscillator 15, and the cross-polarization signal modulator 10 is
Modulation processing is performed based on the signal from the L circuit 16, and furthermore, the main polarization signal transmission circuit 11 and the cross polarization signal transmission circuit 12 are connected to the first . Up-conversion processing is performed based on the signal from the second transmitting circuit PLL circuit 21°22.

In this way, in the transmitting section 100, the modulator and the transmitting circuit can each use a common local oscillator, which contributes to simplifying the structure of the transmitting section 100 and improving reliability. .

Note that in the transmitter 100, the cross-polarized signal modulator 1
o, a first local oscillator 15 is attached, and the main polarization signal modulator 9 receives a first local oscillation signal from the first local oscillator 15 and makes it have the same frequency as the first local oscillation signal. A modulation PLL circuit 16 may also be provided.

Further, 101 is a receiving section, and this receiving section 101 includes a main polarization signal receiving system for the main polarization signal V and a cross polarization signal H.
A cross-polarized signal receiving system is provided for this purpose.

First, the main polarization signal receiving system includes a receiving antenna 2°, a main polarization signal receiving circuit 23. It has a main polarization signal demodulator 25 with a cross-side interwave interference compensator 27, and the cross-polarization signal receiving system includes a receiving antenna 2. Cross-polarized signal receiving circuit 24. Cross-polarized signal demodulator 26 with cross-side interwave interference compensator 28
have.

Since the above configuration is the same as the conventional configuration shown in FIG. 3, description of each component will also be omitted.

By the way, in this receiving section 101, a second local oscillator 35 is attached to the main polarization signal receiving circuit 23, and a receiving circuit PLL circuit 36 is attached to the cross polarized signal receiving circuit 24.
is attached. Here, the receiving circuit PLL circuit 36
receives the regenerated carrier signal f0 taken out by the main polarization signal demodulator 25 and the regenerated carrier signal f1 taken out by the cross-polarization signal demodulator 26, and generates the second local oscillation from the second horse section oscillator 35. This is to make the frequency the same as that of the signal, and for this purpose, the receiving circuit PLL circuit 36 includes an arithmetic unit 36A that calculates the difference (f, -f) between the reproduced carrier wave signals f, , f, and a lag lead. A loop filter 36B as a low-pass filter with a filter configuration and a voltage controlled oscillator 36C
It is composed of the following. In addition, loop filter 3
As 6B, a low-pass filter having an active filter configuration may be used.

Therefore, the main polarization signal reception circuit 23 is subjected to down-conversion processing based on the second local oscillation signal from the second local oscillator 35, and the cross-polarization signal reception circuit 24 is subjected to the down-conversion process based on the second local oscillation signal from the second local oscillator 35, and the cross-polarization signal reception circuit 24 is Down-conversion processing is performed based on the signal from 36.

In this way, in the receiving section 101, the main polarization signal receiving circuit 23 and the cross-polarized signal receiving circuit 24 can each use a common local oscillator. This can contribute to simplification and improved reliability.

In this receiving section 101, the second local oscillator 35 may be attached to the cross-polarized signal receiving circuit 24, and the receiving circuit PLL circuit 36 may be attached to the main polarized signal receiving circuit 23.

Furthermore, in the above embodiment, either the transmitter 100 or the receiver 101 may have a conventional configuration as shown in FIG.

[Effects of the Invention] As detailed above, according to the cross-polarized radio system of the present invention, it is possible to share the local oscillator between the modulator and the multiplier circuit in the transmitting section. ,
This has the advantage of simplifying the structure of the transmitting section and contributing to improved reliability.

Similarly, in the receiving section, the main polarization signal receiving circuit and the cross-polarized signal receiving circuit can each use a common local oscillator, which simplifies the structure of the receiving section and ultimately This provides advantages that contribute to improved reliability.

Furthermore, since the transmitting section and the receiving section can each use a common local oscillator, there is an advantage that the overall system structure can be simplified and reliability can be improved.

[Brief explanation of drawings]

FIG. 1 is a block diagram of the principle of the present invention, FIG. 2 is a block diagram showing an embodiment of the present invention, and FIG. 3 is a block diagram showing a conventional example. FIG. 4 is a block diagram showing a cross-polarization wireless system having a transversal cross-polarization interference compensator. FIG. 5(a) is a diagram illustrating the interleaving method among the cross-polarized radio methods. FIG. 5(b) is a diagram illustrating the common channel method among the cross-polarized radio methods. In the figure, 1 is a transmitting antenna, 2 is a receiving antenna, 9 is a main polarization signal modulator, 10 is a cross-polarization signal modulator, and 11 is a main polarization signal transmission circuit. 12 is a cross-polarized signal transmission circuit, 13.14 is a high-output amplifier, 15 is a first local oscillator, 16 is a modulation PLL circuit, 21 is a PLL circuit for the first transmission circuit, 22 is a second transmission circuit PLL circuit for. 23 is a main polarization signal receiving circuit, and 24 is a cross polarization signal receiving circuit. 25 is a main polarization signal demodulator, 26 is a cross polarization signal demodulator. 27 and 28 are cross-side wave interference compensators, 35 is a second local oscillator, 36 is a PLL circuit for the receiving circuit, 36A is an arithmetic unit, 36B is a loop filter, and 36C is a voltage controlled oscillator.

Claims (3)

[Claims] (1) In a cross-polarization wireless system that transmits information in the same frequency band by dividing it into a main polarization signal and a cross-polarization signal, and has a cross-polarization interference compensator (27, 28) in the receiving section, The transmitter (100) includes a main polarization signal modulator (9) that performs modulation processing on the main polarization signal, and a cross polarization signal modulator (10) that performs modulation processing on the cross polarization signal. , a main polarization signal transmission circuit (11) that increases the modulation output from the main polarization signal modulator (9) to the transmission frequency, and a modulation output from the cross polarization signal modulator (10). Transmission circuit for cross-polarized signals (1
2), one of the main polarization signal modulator (9) and the cross-polarization signal modulator (10) is subjected to modulation processing based on the local oscillation signal from the local oscillator (15). and the other of the main polarization signal modulator (9) and the cross-polarization signal modulator (10) receives the local oscillation signal and modulates it to the same frequency as the local oscillation signal. PLL circuit (
modulation processing is performed based on the signal from the local oscillator (16), and the main polarization signal transmission circuit (11) and the cross-polarization signal transmission circuit (12) each perform modulation processing based on the signal from the local oscillator (16).
15) PLLs for the first and second transmitting circuits for receiving a local oscillation signal from the oscillator and multiplying the frequency of the local oscillation signal.
A cross-polarized radio system characterized in that up-conversion processing is performed based on signals from circuits (21, 22). (2) In a cross-polarized radio system that transmits information separately into a main polarization signal and a cross-polarized signal in the same frequency band and has a cross-polarization interference compensator (27, 28) in the receiving section, The receiving section (101) includes a main polarization signal receiving circuit (23) that lowers the frequency of the main polarization reception signal, and a cross polarization signal reception circuit (24) that lowers the frequency of the cross polarization reception signal. ), a main polarization signal demodulator (25) that demodulates the signal from the main polarization signal reception circuit (23), and a main polarization signal demodulator (25) that demodulates the signal from the cross polarization signal reception circuit (24). A cross-polarized signal demodulator (26) for processing is provided, and one of the main polarized signal receiving circuit (23) and the cross-polarized signal receiving circuit (24) receives signals from a local oscillator (35). A down-conversion process is performed based on the local oscillation signal of the main polarization signal, and the other of the main polarization signal receiving circuit (23) and the cross polarization signal receiving circuit (24) is a demodulator for the main polarization signal. (
a PLL circuit (36) for a receiving circuit for receiving the regenerated carrier wave signal taken out in step 25) and the regenerated carrier wave signal taken out in the cross-polarized signal demodulator (26) and making it the same frequency as the local oscillation signal; A cross-polarized radio system that performs down-conversion processing based on signals from. (3) In a cross-polarized radio system that transmits information in the same frequency band by dividing it into a main polarization signal and a cross-polarized signal, and has a cross-polarization interference compensator (27, 28) in the receiving section, The transmitter (100) includes a main polarization signal modulator (9) that performs modulation processing on the main polarization signal, and a cross polarization signal modulator (10) that performs modulation processing on the cross polarization signal. , a main polarization signal transmission circuit (11) that increases the modulation output from the main polarization signal modulator (9) to the transmission frequency, and a modulation output from the cross polarization signal modulator (10). Transmission circuit for cross-polarized signals (1
2), and the receiver (101) includes: a main polarization signal receiving circuit (23) that lowers the frequency of the main polarization reception signal; and a cross polarization signal reception circuit that lowers the frequency of the cross polarization reception signal. A polarized signal receiving circuit (24), a main polarized signal demodulator (25) that performs demodulation processing on the signal from the main polarized signal receiving circuit (23), and a cross polarized signal receiving circuit. (24); and a cross-polarized signal demodulator (26) that performs demodulation processing on the signal from the main polarized signal (24). One of the signal modulators (10) is subjected to modulation processing based on the first local oscillation signal from the first local oscillator (15), and the main polarization signal modulator (9) and the cross polarization The other side of the wave signal modulator (10) is a modulation PL for receiving the first local oscillation signal and making it have the same frequency as the first local oscillation signal.
Modulation processing is performed based on the signal from the L circuit (16), and the main polarization signal transmission circuit (11) and the cross-polarization signal transmission circuit (12) each perform a modulation process on the signal from the first local oscillator (16).
5) Up-conversion processing based on the signals from the first and second transmitting circuit PLL circuits (21, 22) to receive the first local oscillation signal from the first local oscillation signal and make the first local oscillation signal a multiplied frequency. and the receiving section (101)
In this case, one of the main polarization signal receiving circuit (23) and the cross polarization signal receiving circuit (24) is connected to the second local oscillator (35).
A down-conversion process is performed based on the second local oscillation signal from the main polarization signal, and the other of the main polarization signal receiving circuit (23) and the cross polarization signal receiving circuit (24) Demodulator for (
a receiving circuit PLL circuit (25) for receiving the regenerated carrier signal taken out by the cross-polarized signal demodulator (26) and making it have the same frequency as the second local oscillation signal; 36) A cross-polarized radio system, characterized in that a down-conversion process is performed on a signal from 36).