Simultaneous uplink transmission in a wireless network

摘要

A synchronization data unit is generated by an access point. The synchronization data unit (i) is for scheduling subsequent simultaneous transmission of a plurality of data units by communication devices, and (ii) specifies respective sets of spatial streams that respective communication devices are to use when transmitting respective data units. A signal is received via a plurality of antennas of the access point, where the signal corresponds to the plurality of data units transmitted simultaneously from the respective communication devices via the respective sets of sets of spatial streams. An estimate of the MIMO communication channel is determined using a plurality of training fields included in a first portion of the signal, and data in a second portion of the signal is decoded using the estimate of the MIMO communication channel.

主权项

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,
wherein causing the first communication device to transmit the first data unit includes applying, at the first communication device, a spatial mapping to the plurality of training fields in accordance with the selected first sub-matrix.