Apparatus and methods for multi-user simultaneous transmission

A network device for transmitting a frame to an Access Point (AP) in a Wireless Local Area Network (WLAN) as part of an uplink multi-user simultaneous transmission, the network device to act as a first station (STA) in the WLAN, the network device configured to avoid an occurrence of unintentional beamforming at the AP, the network device comprising:

• a Radio Frequency (RF) transceiver;
• a non-transitory machine-readable medium having stored therein a multi-user simultaneous transmission module;
• and
• a set of one or more processors coupled to the non-transitory machine-readable medium, the set of one or more processors configured to execute the multi-user simultaneous transmission module, the multi-user simultaneous transmission module configured to receive, using the RF transceiver, a first frame from the AP, wherein the first frame includes scheduling information for scheduling a simultaneous uplink transmission for the first STA and one or more other STAs, generate a second frame having a common part and a user-specific part, wherein the second frame is to be transmitted simultaneously with frames generated by the one or more other STAs, according to the scheduling information, determine a common part cyclic shift value to be applied to the common part of the second frame, wherein the common part cyclic shift value is determined to be different from one or more cyclic shift values to be applied by each of the one or more other STAs, apply the common part cyclic shift value to the common part of the second frame, and transmit, using the RF transceiver, the second frame to the AP through a wireless medium.