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Hybrid MU-MIMO spatial mapping using both explicit sounding and crosstalk tracking in a wireless local area network

  • US 10,219,169 B1
  • Filed: 07/11/2016
  • Issued: 02/26/2019
  • Est. Priority Date: 07/09/2015
  • Status: Active Grant
First Claim
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1. A wireless access point (WAP) having a plurality of antennas and supporting a wireless local area network (WLAN) including multiple-input multiple-output (MIMO) communications with associated stations on a selected communication channel, the WAP comprising:

  • hardware processing circuitry to perform hybrid spatial mapping operations for multi-user (MU) MIMO downlinks including;

    an explicit channel sounding circuit for sounding targeted stations among the associated stations for a multi-user (MI) MIMO downlink and for determining from explicit sounding feedback received from said targeted stations both precode matrix “

    Q”

    for spatially mapping the MU-MIMO downlink and a “

    P1AC”

    matrix corresponding to a pseudo inverse of an aggregate channel between the WAP and the targeted stations; and

    a crosstalk damping circuit responsive to crosstalk feedback received from the targeted stations to combine the P1AC matrix with the received crosstalk feedback into an offset matrix and to spatially map subsequent MU-MIMO downlinks with an adjusted precode matrix “

    Q”

    de rived by combining the offset matrix with the precode matrix “

    Q”

    to improve the MU-MIMO downlink between explicit soundings.

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