JP2003101516A - Radio communication apparatus and radio transmission method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a radio communication apparatus with a simple configuration which can make only a reception means located in a desired area where communication can be made to receive communication signals. SOLUTION: The apparatus is equipped with a communication signal transmission means 3 for transmitting a communication signal S1 using a predetermined communication signal oriented pattern A1, and jamming signal transmission means 13 and 14 for transmitting a jamming signal S3 to interfere with the communication signal S1 using jamming signal oriented patterns A3 and A4. The patterns overlap with a portion of the communication signal oriented pattern A1. According to this arrangement, only a reception means 4A, which is located in receivable area A1A that is in the communication signal oriented pattern A1 and out of jamming signal oriented patterns A3 and A4, can receives the communication signal S1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wireless communication device and a wireless transmission method, and is suitable for application to a wireless communication device that transmits a communication signal only in a specific area.

[0002]

2. Description of the Related Art Conventionally, a directional antenna has been used as a means for limiting a communication service area in a wireless communication system. Typical examples of the use of the directional antenna include a sector antenna used in a base station of a cellular communication system and a horn antenna mounted on a communication satellite.

FIG. 2A shows a wireless communication system 1 in which a communication service area is limited by a directional antenna,
The transmitting station 2 transmits the communication signal S1 via the directional antenna 3. This communication signal S1 forms a sector-shaped communication service area A1.

The receiving station 4A within the communication service area A1 can receive the communication signal S1, whereas the receiving station 4B outside the communication service area A1 cannot receive the communication signal S1, and thus the communication service area It is possible to realize a wireless communication system in which

[0005]

Here, in the above-mentioned wireless communication system 1, consider a case where the communication service area is not limited to the sector but to be limited to the spot like the communication service area A2 shown in FIG. 2B. . For example,
In wireless information provision at an event or the like temporarily held, there may be a case where a communication signal is desired to be transmitted only to a receiving station in the event site.

However, in the wireless communication system 1 using the directional antenna 3, the communication signal S1 reaches far away from the desired communication service area A2, which causes reception outside the desired communication service area A2. There was a problem that the station 4C intercepts the communication signal S1.

The present invention has been made in consideration of the above points, and has a simple configuration and a wireless communication apparatus and a wireless transmission method capable of causing only a receiving means within a desired communication area to receive a communication signal. Is to propose.

[0008]

In order to solve such a problem, in the present invention, a communication signal transmitting means for transmitting a communication signal in a predetermined communication signal directing pattern, and an interfering signal interfering with the communication signal in a communication signal directing pattern. And a disturbing signal transmitting means for transmitting with a disturbing signal directing pattern overlapping with a part of the signal, and receiving the communication signal only to the receiving means within the receivable area within the communication signal directing pattern and outside the disturbing signal directing pattern. I was allowed to.

By properly combining the communication signal directivity pattern and the disturbing signal directivity pattern, it is possible to interfere the communication signal outside the receivable area with the disturbing signal and prevent interception of the received signal outside the receivable area.

[0010]

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

In FIG. 1 in which the same parts as those in FIG. 2 are designated by the same reference numerals, 10 indicates the whole radio communication system according to the present invention, and the transmitting station 11 is provided with a directional antenna 3 as a communication signal transmitting means. And transmits the communication signal S1.
This communication communication S1 is a sector-shaped communication service area A1.
To form.

In addition to the above configuration, the transmitting station 11 has interference signal antennas 13 and 14 as interference signal transmitting means in addition to the directional antenna 3. Then, the transmitting station 11 transmits the interference signal S3 having the same frequency as the communication signal S1 via the interference signal antennas 13 and 14. The interference signal antennas 13 and 14 have the same directivity as the directional antenna 3, so that the interference signal S3 has the same sector-shaped interference area A as the communication signal S1.
3 and A4 are formed.

Here, in the transmitting station 11, the interference signal antennas 13 and 14 are arranged in a predetermined direction so that a part of the communication service area A1 overlaps with the interference areas A3 and A4.

As a result, the communication service area A1 is divided into a receivable area A1A, which is an area that does not overlap the disturbing areas A3 and A4, and a disturbed area A1A, which is an overlapping area of the disturbing areas A3 and A4.

Receiving station 4A within communicable area A1A
Only the communication signal S1 arrives at. As a result, the receiving station 4A can receive the communication signal S1 as in the conventional example. On the other hand, the interference signal S3 together with the communication signal S1 arrives at the receiving station 4C in the disturbed area A1B, and the communication signal S1 is disturbed by the interference signal S3. Therefore, the receiving station 4C cannot receive the communication signal S1.

Thus, in the wireless communication system 10, the communicable area A1A, which is a spot-like communication service area, can be formed.

In the above structure, the transmitting station 11 transmits the communication signal S1 forming the communication service area A1 via the directional antenna 3 and the interference area A3 and the interference area A3 via the interference signal antennas 13 and 14. By transmitting the interference signal S3 so that A4 overlaps with a part of the communication service area A1, the communicable area A1A where only the communication signal S1 reaches and the disturbed area where the interference signal S3 reaches together with the communication signal S1 And A1B.

As a result, the transmitting station 11 has a receivable area A1A which is a spot-like area in which the communication signal S1 can be received.
Can be formed, and interception of the received signal S1 outside the receivable area A1A can be prevented.

In the above-mentioned embodiment, the interference signal S3 is transmitted from the two interference signal antennas 13 and 14, but the invention is not limited to this, and any desired receivable area can be formed. For example, the interference signal may be transmitted from one interference signal antenna or from two or more interference signal antennas.

In the above embodiment, the directional antenna 3 and the interfering signal antennas 13 and 14 are arranged in a predetermined direction. However, the present invention is not limited to this, and the receiving station is not limited to this. The directional directions of the directional antenna 3 and the interfering signal antennas 13 and 14 may be changed in accordance with the change in the position of 1 to change the position and pattern of the receivable area A1A as appropriate. In this case, as an antenna applicable to the directional antenna 3 and the interference signal antennas 13 and 14, an adaptive array antenna or the like can be considered.

[0021]

As described above, according to the present invention, the communication signal transmitting means for transmitting the communication signal in the predetermined communication signal directing pattern and the interference signal for interfering with the communication signal overlap a part of the communication signal directing pattern. And an interfering signal transmitting means for transmitting with an interfering signal directing pattern, and by appropriately combining the communication signal directing pattern and the interfering signal directing pattern, the communication signal outside the receivable area is obstructed by the interfering signal, and the receivable area concerned. Preventing interception of received signals outside,
The communication signal can be received only by the receiving means within the receivable area.

[Brief description of drawings]

FIG. 1 is a schematic diagram showing a configuration of a wireless communication system according to the present invention.

FIG. 2 is a schematic diagram showing limitation of a communication service area by a directional antenna.

[Explanation of symbols]

1, 10 ... Wireless communication system, 2, 11 ... Transmitting station,
3 ... Directional antenna, 4A-4N ... Receiving station, 13,
14 ... Antenna for interference signal.

Continued front page    F-term (reference) 5J104 AA48 PA01                 5K067 AA21 BB02 EE02 EE10 KK02                       KK03

Claims (4)

[Claims] 1. A communication signal transmitting means for transmitting a communication signal in a predetermined communication signal directing pattern, and an interfering signal interfering with the communication signal in an interfering signal directing pattern overlapping a part of the communication signal directing pattern. A wireless communication apparatus, wherein the communication signal is received only by a receiving means within a receivable area within the communication signal directivity pattern and outside the interference signal directivity pattern. 2. The communication signal transmitting means and the interfering signal transmitting means change the communication signal directivity pattern and the interfering signal directivity pattern according to a change in the receivable area. The wireless communication device according to. 3. A communication signal is transmitted in a predetermined communication signal directing pattern, and an interfering signal interfering with the communication signal is transmitted in an interfering signal directing pattern overlapping a part of the communication signal directing pattern. A wireless transmission method characterized in that the communication signal is received only by a receiving means within a receivable area within the directivity pattern and outside the interference signal directivity pattern. 4. The radio transmission method according to claim 3, wherein the communication signal directivity pattern and the interfering signal directivity pattern are changed according to the change of the receivable area.