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US 7,257,088 B2Granted
SDMA system using MU-SIMO for the uplink and MU-MISO for the downlink
Assignee3Com Corporation
InventorNiels Van Erven
Life of this patent
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Abstract
The present invention relates to multiple antenna wireless access points that multiplex signals by spatial division. In particular, it relates to grouping clients of the access point for spatial division multiplexing. Particular aspects of the present invention are described in the claims, specification and drawings.
Claims31
A method of serving clients in a wireless system with m antennas, the clients outnumbering the antennas, the method including:
- grouping the clients into sets of m−1 or fewer clients;
- determining for the sets whether members of the sets can practically be spatially resolved using the antennas;
- for at least one particular set in which at least two set members cannot practically be spatially resolved,
- changing the members of the particular set and
- reevaluating whether resulting members of the particular set can practically be spatially resolved;
- and
- serving the clients in the wireless system, grouped into the sets and transmitting simultaneously to the members of the particular set during a particular time allocation.
4 more elements
A device that serves clients in a wireless system, including:
- m signal feeds;
- logic and resources coupled to the m signal feeds to
- group the clients into sets of m−1 or fewer clients;
- determine for the sets whether members of the sets can practically be spatially resolved using the signal feeds;
- for at least one particular set in which at least two set members cannot practically be spatially resolved, change the members of the particular set, reevaluate whether resulting members of the particular set can practically be spatially resolved and transmit simultaneously to the members of the particular set during a particular time allocation.
2 more elements
Dependencies are inferred from the claim text.