JPH042982A - Radio communication apparatus - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a wireless communication device, and more particularly to a wireless communication device that provides position and direction information from a fixed station of a mobile wireless communication device to a mobile station. .

[Prior Art] A simple method for providing location information of a mobile station from a fixed station of a mobile radio communication device to a mobile station is to include the location information of the fixed station in the data transmitted from the fixed station to the mobile station. There was a method in which an identification code was inserted and transmitted, and the mobile station that received this read the identification code and knew that it was within the service area of the fixed station.

However, with this method, when a mobile station enters the service area of the fixed station, it is difficult to know in which direction it came in, and in which direction when it leaves the service area. There was a problem in that it was not possible for the mobile station to determine whether the mobile station had visited or not.

[Problems to be Solved by the Invention] The present invention has been made to solve the above problems, and an object of the present invention is to provide a wireless communication device that can easily determine the moving direction of a moving object.

[Means for Solving the Problems] A wireless communication device according to the present invention utilizes a unique word used for purposes such as frame synchronization of digital signals, and transmits a signal with the bit logic of the unique word inverted to a fixed station. By radiating from another antenna, a mobile station can determine its own traveling direction with respect to a fixed station.

[Operation] Considering a low-power mobile communication device with a relatively small service area, and assuming that the mobile station is mounted on a car and moving on the road, the unique word received and detected by the mobile station When the bit pattern changes from a normal bit pattern to a bit pattern with the PILL logic inverted, it can be determined that the mobile station has passed the fixed station, for example in the up direction.

[Examples] Examples of the present invention will be described below with reference to the drawings. 1st
The figure is a block diagram showing an embodiment of the present invention. In the figure, (1) is a data configuration section, (2) is a unique word 1 inversion section, (3) is a carrier wave section, and (4) is a first modulation section. Part, (5
) is the second modulation section, (6) and (7) are the power amplification sections, (8) and (9) are the antennas, respectively, (1,0),
It is assumed that (11) is a pattern representing the directivity characteristics of antennas (8) and (9), respectively, and (12) is a mobile station.

FIG. 2 is a format diagram showing the format of a signal transmitted and received by the apparatus shown in FIG. 1, in which (21) is a preamble section, (22) is a unique word section, and (23) is a data section. The preamble section (21) is used, for example, for the purpose of bit synchronization between transmission and reception, and the unique word section (22) is used, for example, for the purpose of synchronization of frames between transmission and reception.

Therefore, the unique word part (22) is composed of a specific bit pattern, and such a bit pattern is similar to the data part (22).
23), the probability of it actually occurring is extremely low, and
When this bit pattern is detected in the reception of 2),
This is determined to be a unique word. The inverted bit pattern obtained by inverting the bit logic of this unique word is also a special bit pattern, and the probability of its occurrence in the data section (23) is extremely low. Therefore, the unique word (22)
Even if both of the inverted words obtained by inverting the bit logic of this unique word (22) are used as unique words, there is very little chance of malfunction.

The data configuration unit (1) shown in FIG. 1 configures a frame as shown in FIG. Unique word inversion part (2)
inputs the frame shown in FIG. 2, inverts the logic of only the bits in the unique word part (22), and outputs the result.

Modulators (4) and (5) modulate the carrier waves with the outputs of the data configuration unit (1) and unique word inversion unit (2), respectively. Antennas (8) and (9) are respectively modulators (4)
, (5) to the power amplification section (6), (7).
Send via. Patterns (10) and (11,) representing the directivity characteristics of antennas (8) and (9) have their main radiation directions in opposite directions. and pattern (10) representing directional characteristics, <11. ) is made to coincide with the line of the road, for example.

When the mobile station (12) is moving on the road in the direction of the arrow in the drawing, data including the identification code of the fixed station is received together with a unique word of a regular bit pattern, and from the time it passes the fixed station, the unique word is Since the bit logic of the mobile station (12) is inverted, the mobile station (12) can know when the mobile station passes near the fixed station and in what direction.

Note that there are regions where the patterns (10) and N1) representing directivity characteristics are simultaneously received by the mobile station (12), but in such regions, the bits of opposite polarity of the unique word cancel each other out, causing Only the unique word of the pattern remains in the higher Pit 1.

[Effects of the Invention] As explained above, the present invention has the advantage of being able to provide a mobile station with more detailed location information than ever before using simple means.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention, and FIG. 2 is a format 1 to diagram showing a frame structure used in the present invention. (1) is a data configuration section, (2) is a unique word inversion section, (4) is a first modulation section, and (5) is a second modulation section.
) is the first antenna, and (9) is the second antenna.

Claims (1)

[Claims] In a wireless communication device that inserts and transmits a unique word having a specific bit pattern for the purpose of frame synchronization of digital data, etc., the wireless communication device is provided in a fixed station and transmits data including a unique word with a predetermined bit pattern. A data configuration section that configures data; a unique word inversion section that inputs the data configured in this data configuration section, inverts the bit logic of the unique word part of it, and outputs it; a first modulation section that modulates the carrier wave with the output of the unique word inversion section; a second modulation section that modulates the carrier wave with the output of the unique word inversion section; a carrier wave that has a main radiation direction in a predetermined direction and that is modulated by the first modulation section; a second antenna having a main radiation direction in a direction opposite to the predetermined direction and transmitting a carrier wave modulated by the second modulation section; a mobile communicating with the fixed station; means installed in the station to receive and detect the carrier wave, detect whether the unique word part of the detection output is a regular bit pattern or an inverted bit pattern, and obtain information on the direction of movement; Wireless communication device.