JPH05153012A - Defruiter - Google Patents

Abstract

PURPOSE:To remove an interference wave by making the relation of the phases of desired waves to the interference waves of one and the other routes to be constantly opposite at the time of removing the interference wave in a diversity receiving system. CONSTITUTION:An AGC amplifier 103 amplifies a signal from one of the antennas 101, and an opposite phase synthesizer 107 opposite-phase-synthesizes an output of which phase is varied by a phase shifter 105 and an output obtained by amplifying a signal from the other antenna 102 with an AGC amplifier 104. An AGC amplifier 109 amplifies the output to a fixed level and an antenna controller 110 controls the position of at least one of the antennas with the AGC voltage of the AGC amplifier 109 at this time.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an interference wave removing device in a diversity receiving system.

[0002]

2. Description of the Related Art As the communication capacity increases, effective use of frequencies is being pursued, and there is an increasing need to eliminate interference waves with adjacent frequency bands without providing a guard band between them. ing. FIG. 3 shows an example of a conventional interference wave removing device. This example shows a case of double diversity, and the received signal from the antenna 301 is subjected to fading fluctuation removal by the AGC amplifier 303 and input to the in-phase combiner 306 through the phase shifter 305.

The received signal from the antenna 302 is AG
The fluctuation due to fading is removed by the C amplifier 304, and is input to the in-phase combiner 306. The signals are combined by the in-phase combiner 306, and the combined signal is A
It is amplified to a constant level by the GC amplifier 308. The phase shifter 305 uses the AGCV value of the AGC amplifier 308 and controls the signal phases of both routes to be in phase so as to maximize the signal level after in-phase combination.

[0004]

In this interference wave removing device, when there is a small interference in which the level ratio D / I of the desired wave and the interference wave is positive, the phase of the desired wave with respect to the interference wave of one route is generated. When the phase of the desired wave with respect to the interference wave of the other route is opposite in phase, the interference wave is removed by the in-phase synthesis. However, the generation point of the interference wave, the transmission point of communication,
When the phase of the desired wave with respect to the interference wave of one route and the phase of the desired wave with respect to the interference wave of the other route are in phase at the receiving point, there is a problem that the interference wave is not removed by in-phase synthesis. An object of the present invention is to make it possible to remove an interference wave by always making the relationship between the phase of the desired wave with respect to the interference wave of one route and the phase of the desired wave with respect to the interference wave of the other route opposite to each other. It is to provide a wave removing device.

[0005]

SUMMARY OF THE INVENTION An interference wave elimination device according to the present invention provides an output obtained by amplifying a signal from one antenna with an AGC amplifier and varying the phase with a phase shifter, and a signal from the other antenna. The output amplified by the AGC amplifier is reverse-phase combined by the reverse-phase combiner, and the output is amplified by the AGC amplifier to a constant level. At this time, the position of at least one antenna is adjusted by the AGC voltage of the AGC amplifier. It is configured to be controlled by.

[0006]

With the antenna controller, the position of at least one of the antennas is changed electrically or mechanically to control the phases of the desired wave and the interference wave so that they are always opposite to each other, thereby preventing interference.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described with reference to the drawings. FIG. 1 is a block diagram of an embodiment of the present invention.
The case of heavy diversity is shown. A reception signal from one of the antennas 101 is subjected to fading fluctuation removal by an AGC amplifier 103 and input to an in-phase combiner 106 through a phase shifter 105. Further, the received signal from the other antenna 102 is subjected to fading fluctuation removal by an AGC amplifier 104 and input to the in-phase combiner 106. Then, the signals are in-phase combined in the in-phase combiner 106 and amplified to a constant level in the AGC amplifier 108. Here, the phase shifter 106 is the A of the AGC amplifier 108.
Using the GCV value, the signal phases of both routes are controlled to be in phase so that the signal level after in-phase synthesis is maximized.

Further, the output signal of the phase shifter 105 and the output signal of the AGC amplifier 104 are anti-phase combined by the anti-phase combiner 107, amplified by the AGC amplifier 109 to a constant level and output. Here, the AGCV value of the AGC amplifier 109 corresponding to the input level of the AGC amplifier 109 is used, and this value is input to the antenna controller 110 to control at least one of the antennas 101 and 102 so that the anti-phase component becomes maximum. To do. This is because the phase shifter 105 maximizes the in-phase component and the antenna controller 110 electrically or mechanically controls the position of the antenna so as to maximize the anti-phase component. The relationship between the phase of the desired wave with respect to the wave and the phase of the desired wave with respect to the interference wave of the other route is always opposite.

As a result, the level ratio D / of the desired wave and the interference wave is obtained.
When there is a small interference in which I is positive, the desired wave is output to the port of the in-phase combiner 106 and the interference wave is output to the port of the anti-phase combiner 107. When there is a large interference in which D / I becomes negative, the interference wave is output to the port of the in-phase combiner 106 and the desired wave is output to the port of the anti-phase combiner 107.

FIG. 2 shows a mutual positional relationship between a transmission / reception point and an interference point. T is a transmission point, R1 and R2 are reception points, and J is an interference generation point. The desired wave r at R1 is controlled by the control of the present invention.
For example, R1 is moved in the R2 direction or the opposite direction so that the phase relationship between ₁ and the interference wave c ₁ and the phase relationship between the desired wave r ₂ and the interference wave c ₂ in R2 are always in the opposite phase. As a method of moving the position of the antenna, there is a method of electrically moving the center of the beam using a phased array antenna, or a method of mechanically moving the antenna.

[0011]

As described above, according to the present invention, by mechanically or electrically moving the position of the antenna as the receiving point, the phase of the desired wave with respect to the interference wave of one route and the phase of the other route. The relationship between the phase of the desired wave and the phase of the interference wave can always be reversed, and the interference wave can be removed.

[Brief description of drawings]

FIG. 1 is a block configuration diagram of an embodiment in which an interference wave removing device of the present invention is applied to a dual diversity system.

FIG. 2 is a schematic diagram showing a mutual relationship between a transmission / reception point and an interference point.

FIG. 3 is a block configuration diagram of an example of a conventional interference wave removing device.

[Explanation of symbols]

 101, 102 antennas 103, 104 AGC amplifier 105 phase shifter 106 in-phase combiner 107 anti-phase combiner 108, 109 AGC amplifier 110 antenna controller

Claims (1)

[Claims] 1. A first AG that amplifies a signal from one antenna in a diversity type interference wave elimination device.
C amplifier (automatic gain control amplifier), phase shifter for varying the phase of its output signal, second AGC amplifier for amplifying the signal from the other antenna, said phase shifter and first AG
An in-phase combiner for in-phase combining the outputs of the C amplifier, a third AGC amplifier for amplifying the combined output to a constant level and controlling the phase shifter, the phase shifter and the second AG
An anti-phase combiner for performing an anti-phase combination with the output of the C amplifier, and a fourth AGC amplifier for amplifying this output to a constant level,
An interference wave elimination device comprising an antenna controller that controls the position of the at least one antenna by the AGC voltage of the fourth AGC amplifier.