Transmit diversity with formed beams in a wireless...

Details Transmit diversity with formed beams in a wireless... Transmit diversity with formed beams in a wireless...

2007-04-17

2007-04-17

Nguyen, Tony T. (Department: 2618)

Telecommunications

Transmitter

Diversity

C455S114200, C455S115200, C455S269000, C370S329000, C370S342000

Reexamination Certificate

active

10186986

ABSTRACT:
A method and apparatus are provided that allows beamforming to be used on a user-specific signal together with a sector-wide pilot signal in a communication system, such as a CDMA system. In one embodiment, the invention includes transmitting a pilot signal with a wide beamwidth to a remote terminal from a first array, transmitting a first traffic signal with a narrow beamwidth directed to the remote terminal from the first array, and transmitting a second diversity traffic signal with a second narrow beamwidth directed to the remote terminal from a second array. In some examples, the invention may also include transmitting a second pilot signal from the second antenna array.

REFERENCES:
patent: 6067290 (2000-05-01), Paulraj et al.
patent: 6320853 (2001-11-01), Wong et al.
patent: 6347234 (2002-02-01), Scherzer
patent: 6738020 (2004-05-01), Lindskog et al.
patent: 6782036 (2004-08-01), Dowling et al.
patent: 6865377 (2005-03-01), Lindskog et al.
patent: 6999794 (2006-02-01), Lindskog et al.
patent: 2001/0031647 (2001-10-01), Scherzer et al.
patent: 2004/0266457 (2004-12-01), Dupray
patent: 10026077 (2001-12-01), None
patent: WO0163776 (2001-08-01), None
Pedersen et al, “A Simple Downlink Antenna Array Algorithm Based on a Hybrid Scheme of Transmit Diversity and Conventional Beamforming”, 2001 IEEE, pp. 58-62.
Lindskog et al., “A Transmit Diversity Scheme for Channels with Intersymbol Interference”, ICC 2000, Jun. 2000, vol. 1, pp. 307-311.

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