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METHOD AND APPARATUS FOR REPORTING CHANNEL STATE INFORMATION OF MULTI-CHANNEL IN WIRELESS LOCAL AREA NETWORK SYSTEM

  • US 20120026909A1
  • Filed: 07/29/2011
  • Published: 02/02/2012
  • Est. Priority Date: 07/30/2010
  • Status: Active Grant
First Claim
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1. A method for reporting channel state information (CSI), performed by a beamformee, in a wireless local area network system using multi-channels, the method comprising:

  • receiving, from a beamformer, an NDP announcement (NDPA) frame announcing that a null data packet (NDP) frame follows the NDPA frame;

    receiving the NDP frame from the beamformer;

    estimating a channel from a training symbol of the NDP frame; and

    transmitting to the beamformer a CSI report frame containing a result obtained by estimating the channel,wherein the channel is a multi-channel acquired by aggregating first and second channels which are non-contiguous to each other, andwherein the CSI report frame includes an average signal to noise ratio (SNR) for each space-time stream of the first channel and a steering matrix for each subcarrier of the first channel and an average SNR for each space-time stream of the second channel and a steering matrix for each subcarrier of the second channel.

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