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
AssigneeWilliam Marsh Rice University
InventorsAdriana B. Flores Miranda, Edward W. Knightly
Life of this patent
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Abstract
A 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.
Claims19
A client device, comprising:
- a processor;
- and
- an antenna,
- wherein the client device is programmed to:
- obtain an announcement that specifies a winning client of a channel contention competition;
- identify a group association of the client device using an identity of the winning client;
- transmit a preamble modulated by an entry of a preamble interference nullification matrix, wherein the entry is based on the group association;
- and
- transmit, after transmitting the preamble, a data transmission,
- wherein the preamble is transmitted at the same time as a second preamble is transmitted by a second client device.
An access point, comprising:
- a processor;
- and
- an antenna array comprising a plurality of antennas,
- wherein the access point is programmed to:
- obtain an announcement that specifies a winning client of a channel contention competition;
- simultaneously receive a preamble from each client of a plurality of clients, wherein the plurality of clients comprises the winning client and a second client;
- simultaneously receive, after receiving the preamble from a client, a data transmission from each client of the plurality of clients;
- and
- remove interference, caused by simultaneous reception of the data transmission from each client, from each data transmission using the preamble corresponding to each client;
- wherein each preamble is a high throughput preamble that comprises a plurality of symbols, wherein each symbol of the plurality of symbols is modulated by an entry of a preamble interference nullification matrix.
Dependencies are inferred from the claim text.