Apparatus and method for transmit diversity and beamforming...

Details Apparatus and method for transmit diversity and beamforming... Apparatus and method for transmit diversity and beamforming...

2011-01-04

2011-01-04

Phu, Sanh D (Department: 2618)

Telecommunications

Transmitter

Diversity

C455S114200, C455S273000, C455S279100, C455S226100

Reexamination Certificate

active

07865153

ABSTRACT:
A base station for use in a wireless network communicating with a plurality of subscriber stations. The base station transmits in a downlink channel to a first subscriber station using a plurality of transmit antennas. The base station transmits to the first subscriber station using either a transmit diversity scheme or a beamforming scheme according to the amount of correlation between the transmit antennas observed at the first subscriber station. The base station also transmits to the first subscriber station using a cyclic delay diversity scheme having either zero delay or non-zero delay according to the amount of antenna/channel correlation observed at the first subscriber station.

REFERENCES:
patent: 7050832 (2006-05-01), Kasapi
patent: 2003/0068983 (2003-04-01), Kim et al.
patent: 2005/0286650 (2005-12-01), Han et al.
International Search Report issued on Oct. 25, 2007 in connection with PCT Application No. PCT/KR2007/003871.
Hongji Xu et al., “Joint Beamforming and Transmit Diversity for Wireless Communications,” 2004 IEEE, pp. 195-199.
Robert H. Morelos-Zaragoza et al., “Combined Beamforming and Space-Time Block Coding with a Sparse Array Antenna,” 2002 IEEE, pp. 432-434.

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