Patent ID: 9698878
Date: 2017-07-04
CPC Classifications: H04B,H04W

Claim:
1. A wireless transceiver apparatus for a wireless local area network (WLAN) supporting wireless communications of associated wireless transceivers on a selected communication channel, and the wireless transceiver apparatus comprising: a plurality of antenna; a plurality of components coupled to one another to form transmit and receive chains each coupled to a corresponding one of the plurality of antenna for multiple-input multiple-output (MIMO) wireless communications on orthogonal frequency division multiplexed (OFDM) tones of the selected communication channel; a sounding feedback module coupled to the plurality of components, and responsive to reception by the receive path components of an explicit channel sounding packet from an other one of the transceivers on the WLAN to transmit a sounding feedback packet of multiple-input multiple-output (MIMO) channel state information (CSI) derived from the explicit channel sounding packet to the other one of the transceivers; and a sounding feedforward module coupled to the plurality of components to monitor CSI derived from subsequent user data packets received from the other one of the transceivers and responsive to a determination of a change above a threshold amount in the monitored CSI relative to the CSI derived from the last explicit sounding packet to transmit to the other one of the transceivers an indicia of the change in CSI; thereby reducing explicit sounding overhead by proactively notifying the other one of the transceivers when a new explicit sounding is needed.