SYSTEMS AND METHODS TO COORDINATE TRANSMISSIONS IN DISTRIBUTED WIRELESS SYSTEMS VIA USER CLUSTERING
First Claim
18. A system for coordinating transmissions in distributed wireless systems comprising:
- a plurality of wireless users;
a plurality of base transceiver stations (BTSs) having a plurality of antennas for establishing multiple concurrent distributed-input distributed-output (DIDO) communication channels with the plurality of users;
wherein either the BTSs and/or the wireless users measure link quality of the communication channels therebetween and use the link quality measurements to define a user cluster;
the BTSs and/or the wireless users further measuring channel state information (CSI) between each user and each DIDO antenna within a defined user cluster and precoding data transmissions between the DIDO antennas within the user cluster and the users reachable by those DIDO antennas based on the measured CSI.
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Abstract
Systems and methods are described for coordinating transmissions in distributed wireless systems via user clustering. For example, a method according to one embodiment of the invention comprises: measuring link quality between a target user and a plurality of distributed-input distributed-output (DIDO) distributed antennas of base transceiver stations (BTSs); using the link quality measurements to define a user cluster; measuring channel state information (CSI) between each user and each DIDO antenna within a defined user cluster; and precoding data transmissions between each DIDO antenna and each user within the user cluster based on the measured CSI.
255 Citations
33 Claims
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18. A system for coordinating transmissions in distributed wireless systems comprising:
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a plurality of wireless users; a plurality of base transceiver stations (BTSs) having a plurality of antennas for establishing multiple concurrent distributed-input distributed-output (DIDO) communication channels with the plurality of users; wherein either the BTSs and/or the wireless users measure link quality of the communication channels therebetween and use the link quality measurements to define a user cluster; the BTSs and/or the wireless users further measuring channel state information (CSI) between each user and each DIDO antenna within a defined user cluster and precoding data transmissions between the DIDO antennas within the user cluster and the users reachable by those DIDO antennas based on the measured CSI. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33)
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19-1. The system as in claim 19 wherein the DIDO distributed antennas transmit training signals and the users estimate the received signal quality based on that training.
Specification