Title:
SYSTEM AND METHOD FOR SIMULTANEOUS TRANSMISSION OF SIGNALS IN MULTIPLE BEAMS WITHOUT FEEDER CABLE COHERENCY
Document Type and Number:
WIPO Patent Application WO2001099240
Kind Code:
A3
Abstract:
A telecommunications system and method is disclosed for allowing a base station to simultaneously transmit signal in several beams (1, 2, 3, 4) of a multi-beam antenna configuration. Antenna pattern control is maintained by employing orthogonal polarization orientation for every other beam (1, 2, 3, 4). For example, the two orthogonal polarization directions can be approximately linear polarization slanted +/- 45 DEG . To be able to transmit simultaneously in an arbitrary combination of more than one beam (1, 2, 3, 4), the BS antenna array includes a separate feeder cable (30c, 30f) for each combination of beams (1, 2, 3, 4) corresponding to a particular polarization, from one feeder (30) per beam (1, 2, 3, 4) to one feeder (30) with all beams (1, 2, 3, 4) of that polarization.
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Inventors:
HAGERMAN BO
OESTMAN THOMAS
JOHANNISSON BJOERN
OESTMAN THOMAS
JOHANNISSON BJOERN
Application Number:
PCT/SE2001/001300
Publication Date:
April 04, 2002
Filing Date:
June 07, 2001
Export Citation:
Assignee:
ERICSSON TELEFON AB L M (SE)
International Classes:
H01Q3/26; H01Q21/24; H01Q25/00; H04B7/10; H04W84/04; H04W88/08; (IPC1-7): H01Q25/00; H01Q21/24; H01Q3/26; H04Q7/36; H04B7/10
Foreign References:
| US5924020A | 1999-07-13 | |||
| US5115248A | 1992-05-19 | |||
| EP0715478A2 | 1996-06-05 | |||
| EP0895436A2 | 1999-02-03 | |||
| US5832389A | 1998-11-03 | |||
| DE19535441A1 | 1997-03-27 |
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