2021-03-022021-03-022020-11-10Flores Miranda, Adriana B. and Knightly, Edward W., "Distributed and scalable physical layer and medium access design for uplink multiuser multiple-input, multiple-output (MU-MIMO) in wireless local area network (WLAN) systems." Patent US10833904B2. issued 2020-11-10. Retrieved from <a href="https://hdl.handle.net/1911/110118">https://hdl.handle.net/1911/110118</a>.https://hdl.handle.net/1911/110118A client device includes a processor and an antenna. The client device obtains an announcement that specifies a winning client of a channel contention competition; identifies a group association of the client device using an identity of the winning client; transmits a preamble modulated by an entry of a preamble interference nullification matrix, the entry is based on the group association; and transmits, after transmitting the preamble, a data transmission. The preamble is transmitted at the same time as a second preamble is transmitted by a second client device.26engUtility patentUS10833904B2