×

Method for computing a downlink beamforming weighting vector based on up link channel information

  • US 7,778,211 B2
  • Filed: 02/26/2007
  • Issued: 08/17/2010
  • Est. Priority Date: 09/26/2006
  • Status: Active Grant
First Claim
Patent Images

1. A method comprising:

  • receiving at a plurality of antennas of an antenna array of a base station an uplink transmission that is transmitted from a mobile station, wherein the uplink transmission is transmitted in an uplink channel that comprises a plurality of sub-channels, each of which comprises a plurality of subcarriers;

    computing uplink channel coefficients for the uplink channel from the received uplink transmission at the base station;

    computing for each antenna in the antenna array of the base station, one or more coefficients for a time-domain channel impulse response function from the uplink channel coefficients;

    computing a frequency response of the uplink channel from the time-domain channel impulse response function for each antenna;

    calculating a spatial signature of the uplink channel from the frequency response; and

    computing a downlink beamforming weighting vector for use when making a downlink transmission via the antenna array of the base station on a downlink channel to the mobile station from the spatial signature of the uplink channel, wherein the downlink channel comprises a plurality of downlink sub-channels that share few or no frequency sub-carriers with the plurality of uplink sub-channels.

View all claims
  • 4 Assignments
Timeline View
Assignment View
    ×
    ×