Beamforming with partial channel knowledge

Details Beamforming with partial channel knowledge Beamforming with partial channel knowledge

2011-08-30

2011-08-30

Tarcza, Thomas H (Department: 3662)

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

Directive

Including a steerable array

Reexamination Certificate

active

08009097

ABSTRACT:
A method in a transmitter for selecting steering vectors for simultaneously transmitting a plurality of streams (NS) between the transmitter and a receiver, where the receiver has NRreceive antennas, where the transmitter knows respective channels associated with M receive antennas of the receiver, and where M is less than NR, includes constructing a partial channel matrix that describes a multiple input, multiple output (MIMO) channel between the transmitter and the M receive antennas, generating L independent vectors using the partial channel matrix, wherein L is a rank of the partial channel matrix, selecting a respective steering vector for each of the plurality of streams to be transmitted to the receiver, including, if NSis less than or equal to L, selecting NSof the L independent vectors as the steering vectors, and, if NSis greater than L, (i) selecting the L independent vectors as steering vectors to steer L of the plurality of streams; and (ii) selecting NS−L orthogonal vectors in a null space of the L independent vectors.

REFERENCES:
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patent: 6697633 (2004-02-01), Dogan et al.
patent: 7224758 (2007-05-01), Banister
patent: 7242961 (2007-07-01), Hansen
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patent: 2003/0002450 (2003-01-01), Jalali et al.
patent: 2007/0015526 (2007-01-01), Hansen
David Browne—Beamforming Nugget, http://www.ee.ucla.edu/˜decibel
ugget—beamforming.html., Jun. 26, 2008, pp. 1-5.

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