公开(公告)号：CA2300449A1

公开(公告)日：2000-09-12

申请号：CA2300449

申请日：2000-03-10

Applicant: MOTOROLA INC

Inventor： FARMINE YANN ,  BOIXADERA ESPAX FRANCESEC ,  WHINNETT NICHOLAS

IPC: H01Q3/26 ,  H04B7/06 ,  H04B7/26 ,  H04J11/00 ,  H04L1/06 ,  H04L27/26

Abstract: Antenna weights for a transmit path (3) between two communication devices (1, 2), the first device (1) having an antenna array (4, 5, 6) are generated in the second device (2) and fed back to weighting circuitry (9, 10, 11, 12) in the first device (1). The invention is particularly applicable to multicarrier systems such as OFDM systems. Only weights for those sub-carriers identified as being received with comparatively poor signal quality are calculated and fed back to the first device (1), thus limiting the additional overhead requirements to a minimum.

公开(公告)号：DE69837471D1

公开(公告)日：2007-05-16

申请号：DE69837471

申请日：1998-06-15

Applicant: MOTOROLA INC

Inventor： BOIXADERA ESPAX FRANCESC ,  FARMINE YANN ,  WHINNETT NICHOLAS

IPC: H04L1/12 ,  H04B7/08 ,  H04L1/06

公开(公告)号：ES2212484T3

公开(公告)日：2004-07-16

申请号：ES99400609

申请日：1999-03-12

Applicant: MOTOROLA INC

Inventor： BOIXADERA ESPAX FRANCESC ,  FARMINE YANN ,  WHINNETT NICHOLAS

IPC: H01Q3/26 ,  H04B7/06 ,  H04B7/26 ,  H04J11/00 ,  H04L1/06 ,  H04L27/26 ,  H04B1/00 ,  H04B7/00

Abstract: Antenna weights for a transmit path (3) between two communication devices (1, 2), the first device (1) having an antenna array (4, 5, 6) are generated in the second device (2) and fed hack to weighting circuitry (9, 10, 11, 12) in the first device (1). The invention is particularly applicable to multicarrier systems such as OFDM systems. Only weights for those sub-carriers identified as being received with comparatively poor signal quality are calculated and fed back to the first device (1), thus limiting the additional overhead requirements to a minimum.

公开(公告)号：DE69823986D1

公开(公告)日：2004-06-24

申请号：DE69823986

申请日：1998-07-15

Applicant: MOTOROLA INC

Inventor： BOIXADERA ESPAX FRANCESC ,  FARMINE YANN ,  WHINNETT NICHOLAS

IPC: H04B7/06 ,  H04B7/10 ,  H04B17/00

公开(公告)号：DE69900645T2

公开(公告)日：2002-09-12

申请号：DE69900645

申请日：1999-05-26

Applicant: MOTOROLA INC

Inventor： CLOP OSCAR ,  FARMINE YANN ,  WHINNETT NICOLAS

IPC: H04B7/06 ,  H04B7/02

Abstract: A base station (1) in a radio communication system is provided with an antenna array 2, 3 for communication with a plurality of mobile stations (4, 5). The transmissions of the base station (1) are optimised by adjusting the phase between the signals transmitted by each antenna (2, 3) so that the product of the propagation channel estimates is maximised. The invention has particular application to CDMA-TDD modes of operation where it has been shown to perform favourably in comparison with known transmit diversity techniques. A further advantage is that it does not require added complexity in the channel estimation at each mobile station (4, 5).