System and methods to compensate for doppler effects in multi-user (mu) multiple antenna systems (mas)
AssigneeRearden, LLC
InventorsAntonio Forenza, Stephen G. Perlman
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Abstract
A system and methods are described which compensate for the adverse effect of Doppler on the performance of DIDO systems. One embodiment of such a system employs different selection algorithms to adaptively adjust the active BTSs to different UEs based by tracking the changing channel conditions. Another embodiment utilizes channel prediction to estimate the future CSI or DIDO precoding weights, thereby eliminating errors due to outdated CSI.
Claims41
A distributed antenna system comprising:
- a plurality of subsets of the distributed antennas selected to wirelessly communicate to a plurality of subsets of users based on the Doppler spread of users relative to the distributed antennas.
A multiuser (MU) multiple antenna system (MAS) comprising:
- a plurality of users;
- a plurality of distributed transceiver stations or antennas communicatively coupled to the users via a plurality of wireless links;
- one or more centralized units communicatively coupled to the plurality of distributed transceiver stations or antennas via a network;
- the network comprising wireline or wireless links or a combination of both, employed as a backhaul communication channel;
- the one or more centralized units communicating with the distributed transceiver stations or antennas over the network to adaptively reconfigure communications between the distributed transceiver stations or antennas and users to compensate for Doppler effects due to user mobility or changes in the propagation environment.
A method implemented within a distributed antenna system, the method comprising:
- selecting a plurality of subsets of the distributed antennas to wirelessly communicate to a plurality of subsets of users based on the Doppler spread of users relative to the distributed antennas.
A method implemented within a multiuser (MU) multiple antenna system (MAS) comprising:
- a plurality of users;
- a plurality of distributed transceiver stations or antennas communicatively coupled to the users via a plurality of wireless links;
- one or more centralized units communicatively coupled to the plurality of distributed transceiver stations or antennas via a network;
- the network comprising wireline or wireless links or a combination of both, employed as a backhaul communication channel;
- the method comprising the one or more centralized units communicating with the distributed transceiver stations or antennas over the network to adaptively reconfigure communications between the distributed transceiver stations or antennas and users to compensate for Doppler effects due to user mobility or changes in the propagation environment.
Dependencies are inferred from the claim text.