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System and method capable of closed loop MIMO calibration

  • US 7,596,355 B2
  • Filed: 11/29/2004
  • Issued: 09/29/2009
  • Est. Priority Date: 11/29/2004
  • Status: Active Grant
First Claim
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1. A method of closed loop MIMO calibration in a wireless communication system, comprising:

  • using mutual calibration in said wireless communication system by detecting that station calibration is obsolete and requires calibration;

    determining a range of automatic gain control which said station wants to calibrate and determining a list of transmission power for an Access Point (AP) in communication with said station;

    initiating by said station the calibration by sending said power list and N channel sounding preambles, where N is the number of transmit antennas at the station;

    receiving from said AP a channel matrix and L sets of channel sounding preambles with a different transmission power level for each set, where L is the number of entries in the power list;

    switching to an automatic gain control level of the station in response to the transmission power level received from said AP; and

    sending calibration data to said AP to calibrate a range of automatic gain control for the AP to transmit to the station.

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