JPH08111651A - High sensitivity transmitter-receiver - Google Patents

Abstract

PURPOSE: To easily receive the calling signal from a mobile terminal by preliminarily constituting plural directional beams into rough shapes for applying a digital forming array antenna to a mobile radio communication. CONSTITUTION: The radio signal from a mobile terminal 11 is received by directional antennas 1a to 1d, four-direction directional beam is constituted of hybrid circuits 4a, 4b, 5a an 5b and phase converters 6a and 6b constituting a Butler array antenna, each radio signal according to each direction is outputted to output terminals 22a to 22d, and each signal is simultaneously received by transmitter-receivers 22a to 22d. The signal from the direction where the mobile terminal 11 is located or from the direction of the neighborhood of the mobile terminal of the four directions is received by any transmitter- receiver or plural transmitter-receivers, the signal is decoded and it is outputted as the output waveform of a digital signal.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a highly sensitive transmitter / receiver including an antenna and control means used for digital mobile communication.

[0002]

2. Description of the Related Art FIG. 4 is a block diagram of a conventional digital forming array antenna.
b, 1c, 1d are omnidirectional or directional antennas, 2
a, 2b, 2c, 2d are transceivers, 3 is control means, 11
Is a mobile terminal, and 21 is an output terminal. Radio signals from the mobile terminal 11 are transmitted to the antennas 1a, 1b, 1c and 1d.
And are simultaneously received by the transceivers 2a, 2b, 2c, and 2d. Moving end 11 and antennas 1a, 1b,
Since the positional relationship between 1c and 1d is not uniform, the digital signal received by each transceiver appears delayed or advanced. These digital signals can be taken into the control means 3 and can be calculated at high speed to take out from the terminal 21 the digital signals corresponding to directing the directional beam toward the mobile terminal 11.

[0003]

Since the conventional digital forming array antenna is configured as described above, it is necessary to perform the calculation at high speed, and when there are a plurality of unspecified mobile terminals, the directivity is directed. It takes too long to direct the sex beam in that direction, send a ringing signal and wait for a response. In addition, in order to receive a call from an unspecified mobile terminal, it is necessary to call from the mobile terminal when the directional beam comes in the direction of the mobile terminal, which is difficult in terms of timing and takes too much time.

[004]

SUMMARY OF THE INVENTION The present invention has been made to solve these problems, in which a directional beam is roughly divided in a plurality of directions in advance, and calling or waiting is performed in a plurality of directions. This has the advantage that the calculation load can be reduced and the control time can be shortened.

[0005]

[Operation] As a method of roughly setting a directional beam in a plurality of directions, a method of performing calculation and a Butler array antenna using a hybrid circuit can be considered. In the Butler antenna, the directional beam is set by means of high frequency synthesis instead of calculation. it can.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, 1a, 1b, 1c and 1d are directional antennas, 2a, 2b, 2c and 2d are digital transceivers, 3 is control means, 4a, 4b, 5a and 5b are hybrid circuits, and 6a and 6b are, for example, A 45 ° phase shifter, 11 is a mobile terminal, 21a, 21b, 21c and 21d are output terminals, and 22a, 22b, 22c and 22d are connection terminals of the hybrid circuits 5a and 5b. Directional antenna 1
a, 1b, 1c, 1d, hybrid circuits 4a, 4b,
5a, 5b and the 45 ° phase shifters 6a, 6b constitute a Butler array antenna. Radio signals from the mobile terminal 11 are received by the antennas 1a, 1b, 1c, 1d,
Hybrid circuits 4a, 4b, 5a, 5b, phase shifter 6
a and 6b form a directional beam in four directions, and the connection terminal 2
2a, 22b, 22c and 22d output radio signals according to the respective directions, and the transceivers 2a, 2b, 2c and 2
It is received simultaneously at d. The mobile terminal 11 among the above four directions
A signal from a direction in which the vehicle is present or a direction in the vicinity thereof is received by any one of the transceivers 2a, 2b, 2c, 2d or a plurality of transceivers, decoded, and output as an output waveform of a digital signal. These digital signals are transmitted to the control means 3
, And the high-speed operation is performed to correct the directional beam in the direction of the mobile terminal 11 and can be taken out from the terminals 21a, 21b, 21c, 21d as digital signals for each of the plurality of mobile terminals. FIG. 2 shows an example of directivity of a Butler array antenna, which includes 31a, 31b, 31c and 31d.
Indicates a directional beam in four directions. If such a main directional beam is also to be obtained by calculation, the control means 3 is required to have a large calculation speed and a large load for calculation, and an ultra high speed cpu must be used, whereas a butler antenna is used. If used, it is advantageous in that the main directional beam can be obtained without performing high-speed calculation. FIG. 3 shows the high-sensitivity transceivers 9a, 9b, 9c and 9d of the present invention.
In this example, four systems are installed in four directions, and digital signals are output corresponding to each direction. In the above explanation, as a method to roughly set the directional beam,
The method of calculating by using the digital forming array antenna and the method of using the Butler array antenna have been described, but the same effect can be obtained by combining the antenna and the phase shifter. Although the fine adjustment is performed by calculation, the same effect can be obtained by adjusting the phase shift angle of the phase shifter or the connection cable length of the hybrid circuit (actually, the phase shifter is used). To be

[0007]

In mobile communication, in order to establish communication with an unspecified mobile terminal, a base station sends a call signal to the entire surroundings, and the mobile terminal sends a response signal in response to the call signal. In order for the mobile terminal to make a call, the call signal is sent after receiving the broadcast signal from the base station. Conventional digital forming array antennas are mainly designed to operate while slowly rotating a directional beam like a direction finder or radar, and thus have problems in application to mobile communications. In the present invention, a plurality of directional beams are roughly set in advance, and by connecting a transceiver for each of the directional beams, it is possible to wait for calls from mobile terminals in parallel, which is suitable for mobile communication. A digital forming array antenna can be realized.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention.

FIG. 2 is an example of the directional beam of the present invention.

FIG. 3 is an example of the case where the antenna of the present invention is installed in four directions.

FIG. 4 is an example of a conventional digital forming array antenna.

[Explanation of symbols]

1a, 1b, 1c, 1d Antenna 2a, 2b, 2c, 2d Transceiver 3 Control means 4a, 4b, 5a, 5b Hybrid circuit 6a, 6b Phase shifter 9a, 9b, 9c, 9d High-sensitivity receiver 11 Mobile terminal 21 , 21a, 21b, 21c, 21d Output terminals 22a, 22b, 22c, 22d Connection terminals

Claims (6)

[Claims] 1. A digital forming array antenna having a plurality of antennas, a digital communication type transceiver connected to each of the antennas, and control means for processing data from the transceivers. A high-sensitivity transmitter / receiver characterized by being set in a plurality of predetermined directions and extracting data in each of the directions 2. A plurality of antennas, hybrid means connected to each of the antennas, a transceiver connected to one terminal of the hybrid means, and control means for processing data from the transceiver. And a high-sensitivity transceiver for selecting a directional beam most suitable for a specific mobile terminal 3. The antenna according to claim 1, wherein the antenna is a planar patch antenna or an array antenna having a metallic reflecting object in the center, and a plurality of directional beams are formed in combination with the hybrid means. Two
High-sensitivity transceiver 4. A transmitter / receiver of the base station is of a time division multiplex transmission / reception system, and the data is a digital signal and a signal indicating the size of a reception input. High-sensitivity transceiver according to claim 1 or 2. 5. A patent characterized in that the plurality of directional beams are allocated to different mobile terminals, an optimum beam is configured as the mobile terminal moves, and communication is performed through the transceiver. High-sensitivity transmitter-receiver according to claims 1 and 2. 6. The control means comprises means for analyzing digital signals from a plurality of transceivers and means for synthesizing digital signals from a plurality of transceivers according to the analyzed results. High-sensitivity transmission / reception device according to claims 1 and 2