JPS61202533A - Radio relay device - Google Patents

Abstract

PURPOSE:To cancel a transmission signal of own station in an excellent way even when the transmission power, reception sensitivity, a transmission/reception frequency and the relation of position between a transmission antenna and a reception antenna are changed by changing the output level and the phase of a signal coupler with a control signal from a receiver. CONSTITUTION:A signal from an own station transmission antenna 7 exists in a signal received by a reception antenna 1 and the level and phase of the signal are changed depending on the transmission power, reception sensitivity, transmission/reception frequency and the relation of position between the transmission antenna 1 and the reception antenna 7. Since the transmission signal of the own station is advantageous to the receiver 3 when it is smaller, a part of the transmission signal from a transmitter 5 is extracted by the signal coupler 6 and the level and phase are changed at a control level converter 9 and a control phase converter 10 by using a control signal from the receiver 3 and the result is added to the signal from the antenna 1 by a signal adder 2. The control signal from the receiver 3 is controlled so that the transmission signal of the own station is minimized by the output of the receiver 3.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a wireless relay device that simultaneously requires transmitting and receiving functions.

[Conventional technology]

A conventional device of this type is shown in FIG.

In the figure, (1) is a receiving antenna, (2 (is a signal adder that adds a part of the transmitted signal to the received signal, +3) is a receiver,
(4) is a signal converter that converts the received signal into a transmitted signal, +
5) is a transmitter, (6) is a signal combiner that takes out a part of the output signal of the transmitter +5+, +7) is a transmitting antenna, and (8) is a signal combiner that converts the phase of the signal taken out by (6). It is a phase converter.

Next, the operation will be explained.

Among the signals received by the receiving antenna (1), there are signals radiated from the local transmitting antenna (7). Since it is more advantageous for the receiver (3) to transmit a signal from its own station as small as possible, a part of the signal from the transmitter (+5) is sent to the signal combiner (6).
By converting the phase with the phase converter (8) and adding it to the received signal received by the receiving antenna (1) by the signal adder (2), the signal input to the receiver +31 is converted to the own station's transmitting antenna. (7) It is possible to cancel out the signals.

The received signal whose own station's transmitted signal has been canceled is sent to the signal converter +
The signal is converted into a transmission signal by the transmitter 47, amplified to a predetermined transmission signal level by the transmitter 15), and then radiated from the transmitting antenna (7) via the signal combiner (6).

In Fig. 8, +111 indicates the transmitting signal output of the transmitter 15), and +111 indicates the output signal received by the receiving antenna (1).
The received signal radiated from the transmitting antenna (7), 113 is a part of the transmitted signal extracted by the signal combiner (6), and αI is part of the transmitted signal extracted by the signal combiner (6). is shifted by a phase of 01 using a phase converter (8), which is at the same level as the receiving antenna output 1115, but with a phase difference of 180°.

[Problem that the invention seeks to solve]

Conventional wireless relay equipment is configured as described above, so that when the transmitting power, receiving sensitivity, transmitting frequency doublet, and positional relationship between the transmitting antenna and the receiving antenna change, the signal combiner, phase converter, etc. The problem is that because the phase change of the device is constant, it is not possible to effectively cancel out the own station's transmitted signal.

This invention was made to solve the above problems, and by changing the output level and phase of the signal combiner using a control signal from the receiver, the transmission power, reception sensitivity, transmission and reception frequency, and transmission To obtain a radio relay device capable of satisfactorily canceling a transmission signal of its own station even if the positional relationship between an antenna and a receiving antenna changes.

[Means for solving problems]

The wireless relay device according to the present invention allows the level and phase of the transmission signal taken out from the signal combiner to be changed by a control signal, controls it by the output signal of the receiver, and adds it to the received signal, thereby making it possible to change the level and phase of the transmission signal taken out from the signal combiner. This reduces transmitter fog.

[Effect]

By means of the above-mentioned means of the present invention, even if the transmitting power, reliability, transmitting/receiving frequency, and positional relationship between the transmitting antenna and the receiving antenna of the wireless relay device change, the transmitter's own station's transmitting signal can be satisfactorily canceled out, and the transmitter can fog can be reduced.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to the drawings.

In Figure 1, (1) is a receiving antenna, (2) is a signal adder that adds a part of the transmitted signal to the received signal, 13) is a receiver, and (4) is a converter that converts the received signal into a transmitted signal. A signal converter, 151 is a transmitter, +6) is a signal combiner that takes out a part of the output signal of the transmitter +51, (7) is a transmitting antenna, (
9) is a control type level converter which can change the level of the signal from the signal combiner by a control signal; [G is a control type phase converter which can change the phase of the signal from the signal combiner by a control signal.

Next, the operation will be explained.

Among the signals received by the receiving antenna (1), there is a signal from the local transmitting antenna (7). The level, phase, etc. of this signal vary depending on the transmitting power, receiving sensitivity, transmitting/receiving frequency, and positional relationship between the transmitting antenna (1) and the receiving antenna (71). )
Therefore, a part of the transmitted signal from the transmitter (5) is taken out by the signal combiner (6), and a part of the transmitted signal from the transmitter (5) is extracted by the signal combiner (6), and the control signal from the receiver (3) is used to send the signal to the control type level converter (9).
The control signal from the control type phase converter 'J (1) changes the level and phase, and is added to the signal from the receiving antenna (1) by the signal adder (2). The control signal from the receiver 13 is automatically The transmitting signal of the station is controlled so that the output of the receiver 31 is minimized. The received signal with its own station's transmitted signal canceled is converted into a transmitted signal by the signal converter 14+, and after being amplified to a predetermined transmitted signal level by the transmitter +51, it is sent via the signal combiner (6). and radiates from the transmitting antenna (7).

In FIG. 8, the level of the receiving antenna output signal +13 changes depending on the level of the transmitting output signal ttn and the receiving sensitivity of the receiver (3) -J. Further, the phase difference between the signal combiner output and the receiving antenna output signal changes depending on the positional relationship between the transmitting antenna (1) and the receiving antenna.

Although the above embodiment has been described in the case of wireless relay, the same effects as in the above embodiment can be obtained even in a terminal station for duplex communication where transmission and reception are performed simultaneously.

〔Effect of the invention〕

As described above, according to the present invention, the phase and level of the signal added to the received signal are controlled by the output signal of the receiver. Even if the positional relationship changes, the effect of being able to perform a stable wireless relay operation is achieved.

[Brief explanation of drawings]

FIG. 1 shows a system diagram of a wireless relay device according to an embodiment of the present invention. Figure 2 is a system diagram of a conventional wireless relay device.
The figure is a diagram showing the phase relationship of signals in a signal adder. In the figure, (1) is a receiving antenna, (2) is a signal adder, (3) is a receiver, 14 is a signal converter, I5) is a transmitter, (6) is a signal combiner, and (7) is a transmitter. antenna, 18+ is a phase converter, (9) is a controlled level converter, fiG is a controlled phase converter, (ill is a transmission output signal, +12 is a receiving) 8 antenna output signal, 113 is a signal combiner output signal, +
14) is the phase converter output signal. In the figures, the same reference numerals indicate the same or equivalent parts.

Claims (1)

[Claims] In wireless relay equipment that requires simultaneous receiving and transmitting operations, the effect of transmitter fog is reduced by automatically correcting the level and phase of a portion of the transmitted signal and adding it to the receiver. A wireless relay device characterized by: