System and methods to compensate for doppler effects in multi-user (MU) multiple antenna systems (MAS)
First Claim
Patent Images
1. A multiuser (MU) multiple antenna system (MAS) comprising:
- a plurality of users;
a plurality of distributed transceiver stations or antennas cooperatively precoding a plurality of data streams to create a plurality of concurrent non-interfering data links with the users;
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.
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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utilizes channel prediction to estimate the future CSI or DIDO precoding weights, thereby eliminating errors due to outdated CSI.
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Citations
9 Claims
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1. A multiuser (MU) multiple antenna system (MAS) comprising:
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a plurality of users; a plurality of distributed transceiver stations or antennas cooperatively precoding a plurality of data streams to create a plurality of concurrent non-interfering data links with the users; 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. - View Dependent Claims (2)
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3. A method implemented within a multiuser (MU) multiple antenna system (MAS) comprising:
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a plurality of users; a plurality of distributed transceiver stations or antennas cooperatively precoding a plurality of data streams to create a plurality of concurrent non-interfering data links with the users; 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. - View Dependent Claims (4, 5, 6, 7, 8, 9)
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Specification