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utilizes channel prediction to estimate the future CSI or DIDO precoding weights, thereby eliminating errors due to outdated CSI.
Claims45
A multiuser (MU) multiple antenna system (MAS) comprising:
- one or more centralized units communicatively coupled to multiple 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;
- wherein the MU-MAS system comprises one or more sets of user equipment (UE), base transceiver stations (BTSs), controllers (CTRs), centralized processors (CPs) and base station networks (BSNs);
- and
- wherein the CP adaptively selects the BTSs to be used for low- or high-mobility UEs based on latency over the BSN.
A method implemented within a multiuser (MU) multiple antenna system (MAS) to compensate for Doppler effects comprising, the MU-MAS system comprising at least one centralized unit communicatively coupled to multiple distributed base transceiver stations (BTSs) over a network, the method comprising:
- measuring Doppler velocity of a first mobile user relative to the plurality of BTSs;
- and
- the centralized unit communicating with the BTSs over the network to adaptively reconfigure communications between the BTSs and users, wherein adaptively reconfiguring includes dynamically assigning the first mobile user to a first BTS of the plurality of BTSs or to a first set of BTSs based on the measured Doppler velocity for the first BTS relative to other BTSs.
A multiuser (MU) multiple antenna system (MAS) to compensate for Doppler effects comprising:
- a plurality of base transceiver stations (BTSs);
- a network coupling the plurality of BTSs to at least one centralized processor (CP);
- a first mobile user establishing a communication link with each of the BTSs;
- the CP communicating with the BTSs over the network to adaptively reconfigure communications between the BTSs and users, wherein adaptively reconfiguring includes measuring Doppler velocity of a first mobile user relative to each of the BTSs and dynamically assigning the first mobile user to a first BTS of the plurality of BTSs based on the measured Doppler velocity for the first BTS relative to other BTSs.
A multiuser (MU) multiple antenna system (MAS) comprising:
- one or more centralized units communicatively coupled to multiple 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;
- wherein the MU-MAS system comprises one or more sets of user equipment (UE), base transceiver stations (BTSs), controllers (CTRs), centralized processors (CPs) and base station networks (BSNs);
- and
- wherein the CP adaptively selects the BTSs to be used for low- or high-mobility UEs based on the Doppler velocities of every BTS-UE link.
A multiuser (MU) multiple antenna system (MAS) comprising:
- one or more centralized units communicatively coupled to multiple 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;
- wherein the MU-MAS system comprises one or more sets of user equipment (UE), base transceiver stations (BTSs), controllers (CTRs), centralized processors (CPs) and base station networks (BSNs);
- and
- wherein linear prediction is employed to estimate the CSI or MU-MAS precoding weights in the future, thereby eliminating the adverse effect of Doppler on the performance of the MU-MAS.
Dependencies are inferred from the claim text.