Beamforming multiple-input multiple-output hybrid automatic...

Details Beamforming multiple-input multiple-output hybrid automatic... Beamforming multiple-input multiple-output hybrid automatic...

2008-10-10

2010-10-19

Phan, Dao L (Department: 3662)

Communications: directive radio wave systems and devices (e.g.,

Directive

Including a steerable array

C342S373000, C342S377000

Reexamination Certificate

active

07817088

ABSTRACT:
Techniques are provided for improving hybrid automatic repeat request retransmissions techniques in a beamformed multiple-input multiple-output wireless communication environment. At a first device comprising a first plurality of antennas, a plurality of beamforming weight vectors are applied to a corresponding plurality of signal streams for simultaneous transmission to a second device having a plurality of antennas. A determination is made whether the plurality of signal streams need to be retransmitted from the first device to the second device. When a retransmission needs to be made, an order in which the plurality of beamforming weight vectors are applied to the plurality of signal streams is switched for a retransmission attempt of the plurality of signal streams from the first device to the second device.

REFERENCES:
patent: 7710319 (2010-05-01), Nassiri-Toussi et al.
patent: 2009/0232245 (2009-09-01), Lakkis
patent: 2009/0239565 (2009-09-01), Han et al.
patent: 1501210 (2005-01-01), None
Hottinen A., Tirkkonen O., Wichman R.: “Multi-Antenna Transceiver Techniques for 3G and Beyond,” 2003, John Wiley & Sons Ltd., West Sussex, England, pp. 34-35.
International Search Report and Written Opinion dated Mar. 16, 2009; cited in PCT/US2008/080075.

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