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Downlink beamforming method

  • US 6,694,155 B1
  • Filed: 09/05/2000
  • Issued: 02/17/2004
  • Est. Priority Date: 09/24/1999
  • Status: Expired due to Fees
First Claim
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1. A method for downlink capacity enhancement in a wireless communications system comprising a base station with antenna array and terminals that are physically remote from said base station, the method comprising steps of:

  • receiving at said base station antenna array combinations of arriving signals from said plurality of remote terminals;

    estimating an uplink channel covariance matrix (UCCM) for each of said terminals from said combinations of arriving signals;

    constructing from each of said UCCM a downlink channel covariance matrix (DCCM);

    inputting downlink data rate information (DRRI);

    calculating from all said DCCM and DRRI a downlink weight vector for each of said terminals; and

    transmitting a set of information signals from said base station antenna array according to said downlink weight vectors.

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