Patent ID: 9237538
Filing Date: 2016-01-12
CPC Classification: H04B,H04L,H04W

Claim Text:
1. A method for use in a communication system in which a plurality of communication devices simultaneously transmit respective signals to an access point via respective sets of spatial streams, the method comprising: obtaining a selection of a first sub-matrix of a channel estimation matrix that corresponds to an estimate of a MIMO communication channel between the plurality of communication devices and the access point; and generating, at a first communication device in the plurality of transmitters, a physical layer (PHY) preamble of a first data unit, including generating a plurality of training fields; generating, at the first communication device, a data portion of the first data unit; and causing the first communication device to transmit the first data unit to the access point simultaneously with a second communication device in the plurality of communication devices transmitting a second data unit to the access point,