JPH01305730A - Bidirectional repeating facility - Google Patents

Abstract

PURPOSE:To prevent the crosstalk of a radio wave by respectively inserting couplers into the output terminal of a bidirectional transmitter and the input terminal of a receiver and connecting the transmitter/receiver and the couplers through a phase variable means and a level adjustment means in a repeating installation where transmission/reception antennas are arranged near and transmission and reception frequencies are set so that they alternately differ. CONSTITUTION:Since two interruption removal circuits X and Y have the same frequency and have the same function, only X is to be mentioned. A radio wave fB from a transmitter TB in the circuit X is emitted from an antenna ANT2 in the air. A part of the radio wave at that time is propagated to an opposite antenna ANT1 through space and it sneaks in the receiver RA. A part of a component similar to a radio wave fa is extracted in BPF1, and the level is adjusted by amplitude adjuster 5-1, and a phase is adjusted by a phase adjuster 4-1. The phase of the radio wave fB in the coupler 3-1 in the input terminal of the receiver RA is made different by 180 deg. through an amplitude adjuster 5, the phase adjuster 4-1 and a distribution coupler 3-1 so as to eliminate crosstalk.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a two-way relay device n that prevents radio waves from going around between transmitting and receiving antennas in a two-way relay device n of a simultaneous transmitting and receiving system.

(Prior Art) If obstacles such as mountains or buildings exist in the path of radio waves for wireless communication, the transmission of radio waves will be obstructed and communication (3) will not be possible.

Therefore, wireless relay equipment has traditionally been used, but in the simultaneous transmission and reception system (full duplex) used for telephone lines, etc., bidirectional relay must be performed simultaneously for both toll lines and 1,000 lines. Therefore, there is a particularly high need to prevent transmitted radio waves from reaching the receiver, and various measures are required for configuration and frequency settings.

The two-way relay device is generally configured as shown in Fig. 2, and the radio waves received from the antenna ANT+ on the side [
A is guided by the diplexer 1 to the first receiver R8 where it is demodulated into a μ low frequency signal and transmitted to the opposite first receiver R8.
Transmitter 1゛. It is manually input as a modulation signal.

The transmission signal frequency of the first transmitter T11 is "□" which is different from rA, and this radio wave "," is guided to the antenna ANT2 in the opposite direction via the second diplexer 2 and is emitted into space as a radio wave.

In addition, in the opposite direction, the radio wave [C that is manually input to the second antenna ANT2 passes through the diplexer 2 and is sent to the second receiver Rc]
After being demodulated by 1 μm at the receiver Rc, the signal is sent to the second transmitter 1′. The modulated signal becomes a modulated signal, and is sent into space via the diplexer l and the antenna ΔN'1 as a radio wave of a fourth frequency fll different from any of the frequencies mentioned above.

These operations are automatically performed by the action of the control section C when radio waves are manually applied to each antenna 1.2. This control unit C is located between each antenna 1.2 and each paired transmitter/receiver, and has the function of distributing signals in a predetermined direction in response to differences in the frequency of radio waves and the direction of the signals. be.

In addition to the method shown in Figure 2, there is also a method in which the radio waves received by one antenna are directly frequency-converted and amplified without being demodulated, and then sent out from the other antenna.
In this method, the local oscillator frequency has a frequency that is the difference from the receiving frequency, and the local oscillator frequency is added to or subtracted from the receiving frequency at a mixing stage, amplified to the required level, and then transmitted. .

In such a bidirectional relay device, the two antennas 8Ni' l and ANT2 are often installed relatively close to each other. For this reason, the radio waves transmitted by one antenna often generate considerably large amounts of power and reach the receiver connected to it via the other amplifier, causing interference and various other problems.

This interference becomes more pronounced as the frequencies of homes are closer together, so in full duplex communications, it is desirable to separate the transmitting and receiving frequencies as much as possible.

However, there are restrictions on the allocation of radio waves, and even if the frequencies are separated to a certain extent, in cases where antennas must be installed very close together, such as in a two-way repeater, the transmitted radio waves may not reach the receiver. This is causing problems such as those described in Chapter 11.

(Object of the Invention) The present invention has been made in view of the above, and provides a two-way relay that can prevent failures caused by radio wave wraparound even when transmitting and receiving F3 antennas are arranged close to each other. The purpose is to provide a device.

(Summary of the Invention) In order to achieve this object, the two-way relay device of the present invention uses a two-way relay device of a simultaneous transmission and reception method in which a transmitting antenna and a receiving antenna are arranged close to each other and the transmitting and receiving frequencies are set to be different from each other. A coupler is inserted between the transmitter output end and the receiver input end, and the pair of couplers inserted in the transmitter and receiver are connected via the phase variable means and the level adjustment means. It is characterized by its composition.

(Embodiments) Hereinafter, the bidirectional repeater of the present invention will be described in detail based on the embodiments shown in the accompanying drawings.

FIG. 1 shows an embodiment of the present invention, and the same description as the conventional example shown in FIG. 2 indicates the same content.

In this embodiment, distribution couplers 3-1 to 3-4 are inserted between the diplexer 1.2 and each transmitting and receiving device connected thereto, and as shown in the figure, fj pairs are formed. Phase adjuster 4- 1 (4-2) via an amplitude adjuster 5-1 (5-2). Also, there is a band pass filter 131N-'1.131"F2
is inserted.

Distribution coupler 3-11 phase adjuster 4-1, amplitude adjuster 5-
1, B I) r"l, the distribution coupler 3-2 is the first
The first distribution coupler 3-3, phase adjuster 4-2, amplitude adjuster 5-2, 131) F2 and distribution coupler 3-4 constitute the second interference elimination circuit It consists of

Each bandpass filter 1313 Fl, +3 P l:
2. Each antenna! , 2, the transmission output fl1 from ``3.
13 is extracted and used as a reference signal.

Each interference removal circuit X, Y acts in the opposite direction to 7-L,
In the case of
0 (reference signals r, . . . ) are manually input to the input terminals of the receivers 1<0.

The operation in the above configuration will be explained.

Note that the two interference removal circuits X and Y have different frequencies but function in the same way, so only X will be explained.

Radio waves r from the transmitter TM. is emitted into the air from the antenna A N T2, but at this time, a part of the radio wave goes around the opposite antenna A N i' I through space and tries to flow into the paired receiver RA.

Therefore, a part of the same component as this radio wave f is called B PF I
5, and the amplitude (level) of this is extracted by the amplitude modulator 5.
1, and the phase is adjusted by a phase adjuster 4-1 respectively, and the two components of the radio wave ``8'' at the distribution coupler at the input end of the receiver RA;
→ Space → Antenna AN'1゛1 → Radio wave r from the route of diplexer 1 B-1 and 1 combiner 3-2 → IS
The radio waves f 1l-2 from the route of P F I -> amplitude adjuster 5-3 -> phase adjuster 4-1 -> distribution coupler 3-1 have the same amplitude value and a difference of 180 degrees in phase. Adjust as follows.

As a result, these two components cancel each other out and become zero, so receiver 1? There is no need to manually apply components to A, and interference can be removed.

The same applies to the interference removal circuit Y, and here the transmission (+
The radio waves from the aircraft side [D components are canceled out and canceled.

Therefore, it is possible to eliminate interference caused by radio waves from the antennas of two-way relay devices whose antennas are closely grounded.

(Effects of the Invention) Since the present invention is configured as described above, it is possible to prevent transmission radio waves from going around in relaying in a simultaneous transmission/reception system.
Even if the transmitting and receiving frequencies are relatively close, normal bidirectional relaying can be performed.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the present invention, and FIG. 2 is a block diagram of a conventional bidirectional relay device. Sign! , 2... diplexer, 3-1 to 3-4...
Coupler, 4-1.4-2 ... Phase adjuster, 5-■,
5-2...Amplitude adjuster, ANT 1. ANT2...
・Antenna, RA, RC--Receiver, l', , '
r, ... transmitter. C...Controller patent applicant Toyo Tsushinki Co., Ltd. Agent Patent attorney Hitoshi Suzuki

Claims (1)

[Claims] In a two-way relay device using a simultaneous transmission/reception method in which a transmitting antenna and a receiving antenna are arranged close to each other and the transmitting and receiving frequencies are different from each other, coupling is made to each of the transmitter output end and the receiver input end of both. By inserting a transmitter and connecting the couplers of each of the paired transmitter and receiver through filter means, phase variable means, and level adjustment means, the transmission output of one is transmitted to the other receiver. A two-way relay device characterized by canceling out and canceling wraparound.