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Downlink transmit beamforming

  • US 7,719,993 B2
  • Filed: 12/30/2004
  • Issued: 05/18/2010
  • Est. Priority Date: 12/30/2004
  • Status: Active Grant
First Claim
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1. A method comprising:

  • calibrating a plurality of transmit/receive chains in a wireless network access point device, wherein calibrating comprises determining a ratio of transmitter gain to receiver gain for each of the plurality of transmit/receive chains in terms of a ratio of transmitter gain to receiver gain for one of the plurality of transmit/receive chains, and adjusting gain values to make the transmitter gain to receiver gain ratios substantially equal;

    receiving an open loop packet from a station having a first antenna and a second antenna;

    determining a downlink beamforming matrix as a pseudo-inverse of an transpose of the aggregate uplink channel matrix; and

    transmitting a first data stream to the first antenna of the station, and transmitting a second data stream to the second antenna of the station.

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