Wireless communication using multi-transmit multi-receive...

Details Wireless communication using multi-transmit multi-receive... Wireless communication using multi-transmit multi-receive...

2007-08-07

2007-08-07

Payne, David C. (Department: 2611)

Pulse or digital communications

Transmitters

Plural diversity

C375S295000, C375S315000, C455S562100, C455S575700, C455S101000

Reexamination Certificate

active

10509766

ABSTRACT:
A method of closed-loop multi-stream wireless communication between a transmitter (1) comprising a transmit antenna array of N transmit antenna elements and a receiver (3) comprising a receive antenna array (4) of M receive antenna elements, wherein a plurality of distinct data steams (x1X2) are transmitted from the transmit antenna array to the receive antenna array and the data streams are weighted by respective complex weighting matrices before being applied to the transit antenna array. The distinct data steams are separated and estimated at the receiver. The distinct data streams (x1xG) are applied to respective sub-groups (6,7) of the transmit antenna elements at least one of which comprises a plurality of the transmit antenna elements each of the sub-groups comprising at least Nd transmit antenna elements, where M is greater than or equal to (N/Nd). The complex weighting matrices (v1to vn) are functions of the respective transmission channels (hij) of the data streams (x1, to xG) including the respective sub-groupes of transmit antenna elements. Nd is preferably greater than or equal to two. Each of the complex weighting matrices is calculated to be substantially equal to the eigenvector corresponding to the largest eigenvalue of the matrix H H, where H is the matrix of the equivalent channel including the respective sub-groups of transmit antenna elements (6,7) seen by the corresponding data stream HH is the Hermitian transform of the matrix H. The number of the transmit antenna elements in each of the sub-groups is preferably re-configurable during operation as a function of channel conditions.

REFERENCES:
patent: 5590205 (1996-12-01), Popovich
patent: 6353638 (2002-03-01), Hottinen et al.
patent: 6377631 (2002-04-01), Raleigh
patent: 7099380 (2006-08-01), Feng et al.
patent: WO 01/69814 (2000-03-01), None
patent: WO 00/36764 (2000-06-01), None
patent: WO 01/69814 (2001-09-01), None
Ahmed, M. , Pautler, J., Rohani, K.: “CDMA receiver performance for multiple-input multiple-output”, IEEE 54thVehicular Technology, Oct. 7-11, 2001, pp. 1309-1313.

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