Aerial for a central station of a point-to-multi-point radio lin

Details Aerial for a central station of a point-to-multi-point radio lin Aerial for a central station of a point-to-multi-point radio lin

1998-03-13

2000-11-21

Tsang, Fan

Telecommunications

Transmitter and receiver at same station

Radiotelephone equipment detail

455269, 343853, 342373, H01Q 322, H01Q 2100, H04B 106

Patent

active

061515132

DESCRIPTION:

BRIEF SUMMARY
FIELD OF THE INVENTION

The present invention relates to an antenna of a central station of a point-to-multipoint radio relay system. The antenna communicates with a plurality of surrounding subscriber stations, equipped with directional antennas, and produces a sectored characteristic.


BACKGROUND INFORMATION

German Patent No. 3420917A1 describes a point-to-multipoint radio relay system. The German Patent mentioned that the central station possesses an antenna having either an omnidirectional characteristic, or a sector characteristic. To produce an omnidirectional characteristic which covers the entire area surrounding the central station, it is possible to work with a single antenna (dipole). Alternatively to that, the area surrounding the central station can be divided into individual sectors, a separate antenna being responsible for the illumination of each sector. These conventional antenna arrangements require a high transmitting power, both from the central station and the subscriber stations.


SUMMARY OF THE INVENTION

An object of the present invention is to provide an antenna of a central station of a point-to-multipoint radio relay system which requires as low a transmitting power as possible, both on the part of the central station and the subscriber stations, and assures as high a transmission quality as possible.
Because, according to the present invention, the antenna characteristic of the central station is subdivided into sectors which are strictly limited to the surrounding subscriber stations, both the central stations and the subscriber stations get along with a relatively low transmitting power, and high transmission quality is assured in both transmission directions between the fixed station and the subscriber stations. Interference from other radio-communication systems not belonging to the point-to-multipoint radio relay system is kept low due to the concentration of the transmission characteristic of the central station. In this manner, the electromagnetic environmental compatibility (EMUV) is also improved. Due to the concentration of the reception characteristic of the central station on the existing subscriber stations, they need only a relatively low transmitting power to assure good transmission quality from the subscriber stations to the fixed station. Thus, interference in the point-to multipoint radio relay system by other radio-communication systems is largely ruled out. A particularly strong concentration of the antenna characteristic of the central station on the subscriber stations is achieved, in that the antenna of the central station forms transmission lobes and/or reception lobes in the sectors occupied by individual or a plurality of subscriber stations. Advantageously, sectors and lobes, respectively, which are locally separate from one another, are operated in the same channel, i.e. on the same frequency, in the same time slot or in the same code. It is also advantageous if the antenna of the central station aligns a transmission or reception lobe to a subscriber station only if a communication link is to be produced between the two, and removes the directivity characteristic again after the link has terminated. Here, it is expedient to provide a signaling channel between all subscriber stations and the central station which contains information as to for which subscriber stations radio links are to be set up and disconnected, respectively. Such a signaling channel could be transmitted via an omnidirectional characteristic.


BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 shows a schematic representation of a point-to-multipoint radio relay system according to the present invention.
FIG. 2 shows an overview diagram of a beam-forming network for the antenna of the central station.


DETAILED DESCRIPTION OF THE INVENTION

In the point-to-multipoint radio relay system shown in FIG. 1, six subscriber stations TS1 . . . TS6, for example, are arranged around a central station ZS. The distances between the individual subscriber stations TS1 . . . TS6 are very variable. A

REFERENCES:
patent: 5576717 (1996-11-01), Searle et al.
patent: 5596329 (1997-01-01), Searle et al.
patent: 5602555 (1997-02-01), Searle et al.
patent: 5603089 (1997-02-01), Searle et al.
patent: 5809431 (1999-03-01), Bustamante et al.
patent: 5878327 (1999-03-01), Hayashi et al.
patent: 5966641 (1999-10-01), Flowerdew

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