JPH09233093A - Private communication equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a communication equipment by which the direction of an antenna of a terminal station is easily adjusted. SOLUTION: In the case of adjusting the direction of antennas 12a, 12b of a terminal station 30, when a request signal from the terminal station 30 or and an external setting signal is received by a master station 20, the master station 20 sends non-modulation data in a predetermined timing and a reception level detection circuit 9 in the terminal station 30 detects the reception level of a data signal sent from the master station 20, an A/D converter 10 converts the reception level detected by the reception level detection circuit 9 into a digital value and provides the output of it, and the direction of antennas 12a, 12b is adjusted based on the output.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a local communication device, and more particularly to a wireless communication device using millimeter waves.

[0002]

2. Description of the Related Art In recent years, from the viewpoint of effective use of radio resources,
Development of communication systems using millimeter waves has been actively conducted. Among them, since it is easy to secure a bandwidth for performing high-speed transmission with millimeter waves, a wireless LAN system that uses wireless as a LAN of a computer network has been proposed.

FIG. 3 is a diagram for explaining a configuration example of a conventional local area communication device.

In this conventional example, as shown in FIG. 3, a plurality of master stations 103 installed on a ceiling 104 in a premises and a plurality of desks 1
Antennas 10 for transmitting and receiving, which are installed on the respective 02
It is composed of a plurality of terminal stations 105 having 5a, and is a system using a direct wave of circular polarization in order to prevent the effects of shadowing and multipath.

In the in-house communication device configured as described above, transmission / reception in the master station 103 mounted on the ceiling 104 is performed by a wide-angle beam antenna, and a desk or the like 10 is used.
By performing transmission / reception in the terminal station 105 installed on the second station using a narrow-angle beam antenna, interference between adjacent zones and multiple reflections is reduced (see Japanese Patent Laid-Open No. 5-304526).

[0006]

In the conventional local area communication device as described above, since the antenna of the terminal station is a narrow-angle beam antenna, the direction of the beam is adjusted toward the master station and the maximum reception level is obtained. It is necessary to set so that

However, in a communication system such as the TDMA / TDD system, the signals to be transmitted are intermittent, so that
There are problems that it is difficult to monitor the reception level in a normal data transmission state, and it is difficult to judge whether or not the antenna is adjusted in the optimum direction.

The present invention has been made in view of the problems of the above-described conventional techniques, and it is an object of the present invention to provide a local communication device capable of easily adjusting the direction of the antenna of a terminal station. To aim.

[0009]

In order to achieve the above-mentioned object, the present invention provides a master station installed at a high position such as a ceiling and having a wide-angle beam antenna, and a low position installed at a desk or the like, at a narrow angle. In a local communication device having a terminal station equipped with a beam antenna and exchanging data between the master station and the terminal station, the master station has a request signal from the terminal station or an external setting. It comprises a mode of transmitting unmodulated data at a predetermined timing by being input, the terminal station, a reception level detection circuit for detecting the reception level of the data received in the narrow-angle beam antenna, A / D for converting the reception level detected by the reception level detection circuit into a digital value and outputting the digital value
And a converter.

Further, the terminal station is provided with an antenna controller for controlling the direction of the narrow-angle beam antenna based on the reception level converted into a digital value by the A / D converter.

(Operation) In the present invention configured as described above, when adjusting the direction of the narrow-angle beam antenna of the terminal station, the master station receives a request signal from the terminal station or an external setting. Then, the master station sends unmodulated data at a predetermined timing. In the terminal station, the reception level detection circuit detects the reception level of the data received by the narrow-angle beam antenna,
The reception level of the data signal transmitted from the master station is detected. Then, in the A / D converter, the reception level detected by the reception level detection circuit is converted into a digital value and output, and then the direction of the narrow-angle beam antenna of the terminal station is adjusted based on this output value. Be seen.

In this way, when the direction of the narrow-angle beam antenna of the terminal station is adjusted, the adjustment data is sent from the master station at a timing other than the transmission frame. Data can be continuously received, and the direction of the narrow-angle beam antenna of the terminal station can be easily adjusted.

When an antenna controller for controlling the direction of the narrow-angle beam antenna is provided in the terminal station, A
The direction of the narrow-angle beam antenna is automatically adjusted based on the output value from the / D converter.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing the configuration of an embodiment of a local area communication device of the present invention.

In this embodiment, as shown in FIG. 1, a master station 20 installed at a high position such as a ceiling and having a wide-angle beam antenna,
A transmitter / receiver that is installed at a low position such as a desk and is configured with a terminal station 30 having a narrow-angle beam antenna, and is connected to an externally provided computer 1 in the master station 20 and transmits / receives signals. 2 and the transceiver 2 for the terminal station 30
An antenna 3 that is a wide-angle beam antenna that outputs a signal from the terminal station 30 and receives a radio wave from the terminal station 30. Inside the terminal station 30, data of the computer 13 and the terminal station 30 that are externally provided. Interface board 6 for exchanging data, modulator board 5 for modulating a signal output from computer 13 via interface board 6, and transmission for outputting the signal modulated by modulator board 5 to master station 20. The high-frequency board 4 and the antenna 12a that is a narrow-angle beam antenna, the antenna 12b that is a narrow-angle beam antenna that receives the signal output from the master station 20, the narrow-angle and reception high-frequency board 7, and the reception high-frequency board 7 are received. A demodulator board 8 for demodulating the signal, a reception level detection circuit 9 for detecting the level of the signal received by the reception high-frequency board 7, and a reception An A / D converter 10 that converts the reception level of the signal detected by the bell detection circuit 9 into a digital value, and an MPU 11 that controls the transmission signal based on the reception level converted into a digital value by the A / D converter 10. Is provided.

The operation for adjusting the directions of the antennas 12a and 12b of the terminal station 30 in the TDMA / TDD system of the local communication device configured as described above will be described below.

When adjusting the directions of the antennas 12a and 12b of the terminal station 30, first, the computer 1 of the master station 20 is adjusted.
The setting to that effect is input to.

Then, the transceiver 2 outputs unmodulated data at the timing other than the transmission frame from the master station 20.

Here, during the transmission frame, the master station 20 is transmitting the modulation data.

When the modulated data or non-modulated data transmitted from the master station 20 is received by the antenna 12b of the terminal station 30, the reception level detection circuit 9 detects the reception level of the received data, and the A / D Converter 1
At 0, the reception level is converted into a digital value.

The reception level converted into a digital value is M
It is input to the computer 13 via the PU 11 and the interface board 6, and is displayed by a display means such as a CRT (not shown).

After that, the operator of the terminal station 30 adjusts the directions of the antennas 12a and 12b using the displayed reception level, and sets the antennas in the optimum direction in which the reception level becomes maximum.

In a system having a very small area, the transmission of unmodulated data from the master station 20 is not limited to the timing other than the transmission frame, and it is possible to continue the transmission as long as there is no systematic problem.

Also, by sending a request signal from the terminal station 30 side to the master station 20 to adjust the directions of the antennas 12a and 12b of the terminal station 30, the master station 2
From 0, non-modulated data for antenna adjustment is transmitted.

(Other Embodiments) FIG. 2 is a block diagram showing the configuration of another embodiment of the local area communication device of the present invention.

2 is provided with an antenna controller 14 having a motor for driving the antennas 12a and 12b in addition to the one shown in FIG. 1, and the reception level based on the detected reception level. The directions of the antennas 12a and 12b are automatically adjusted so as to maximize.

[0028]

Since the present invention is constructed as described above, it has the following effects.

According to the first aspect of the present invention, when the direction of the narrow-angle beam antenna of the terminal station is adjusted, when the master station receives a request signal from the terminal station or an external setting, the master station receives the request signal. Unmodulated data is transmitted at a predetermined timing, the reception level detection circuit in the terminal station detects the reception level of the data signal transmitted from the master station, and the A / D converter uses the reception level detection circuit. Since the detected reception level is converted into a digital value and output, the terminal station can continue to receive data from the master station, and the direction of the antenna of the terminal station can be easily adjusted.

According to the second aspect of the present invention, since the antenna controller for controlling the direction of the narrow-angle beam antenna is provided in the terminal station, the narrow-angle beam antenna is automatically controlled based on the output value from the A / D converter. The direction is adjusted, and the direction of the antenna of the terminal station can be adjusted more easily.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of an embodiment of a local area communication device of the present invention.

FIG. 2 is a block diagram showing the configuration of another embodiment of the local area communication device of the present invention.

FIG. 3 is a diagram for explaining a configuration example of a conventional local area communication device.

[Explanation of symbols]

 1,13 Computer 2 Transceiver 3,12a, 12b Antenna 4 Transmission high frequency board 5 Modulator board 6 Interface board 7 Reception high frequency board 8 Demodulator board 9 Reception level detection circuit 10 A / D converter 11 MPU 14 Antenna controller 20 Master station 30,35 Terminal station

Claims (2)

[Claims] 1. A master station having a wide-angle beam antenna installed at a high position such as a ceiling, and a terminal station having a narrow-angle beam antenna installed at a low position such as a desk. In the local communication device for exchanging data between the terminal station and the terminal station, the master station, non-modulated data at a predetermined timing by the request signal from the terminal station or external setting is input. And a reception level detection circuit for detecting the reception level of the data received by the narrow-angle beam antenna, and the reception level detected by the reception level detection circuit as a digital value. An on-premises communication device, comprising: an A / D converter for converting and outputting. 2. The indoor communication device according to claim 1, wherein the terminal station controls the direction of the narrow-angle beam antenna based on the reception level converted into a digital value by the A / D converter. An on-premises communication device comprising: