BEAMFORMING IN A MU-MIMO WIRELESS COMMUNICATION SYSTEM WITH RELAYS
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Abstract
This invention presents methods for MU-MIMO wireless communication systems comprising a BS with plural of antennas, either closely located or distributed; A plural of AFRs deployed over a coverage area, each AFR has NBF≥1 BF antennas with a beam pattern facing the MU-BFer and NUF≥1 UF antennas with a beam pattern facing UEs or downstream AFR(s); A channel estimation module for estimating the Total Channels between a plural of UEs and the BS with the AFRs in place; and, A MU-BFer that uses the estimates of the Total Channels to perform beamforming computations for transmitting and/or receiving multiple spatially multiplexed streams of signals to or from a plural of UEs using the same frequency resource.
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Citations
39 Claims
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1-34. -34. (canceled)
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35. A method for Multiple-Input-Multiple-Output (MIMO) communication comprising
estimating total channel parameters comprising correlations and one or more of delay spreads or coherence bandwidth, Channel Quality Information (CQI), Channel Estimation Error (CEE) and User Equipment (UE) Speed Indication Information (SII) of the total channels of different UEs; -
selecting a part of the UEs into a group based on their total channel parameters such that it improves system performance when Amplify and Forward Relays (AFRs) are present, wherein the improved performance comprises one or more of Multi-User MIMO (MU-MIMO) beamforming, increased system throughput, reduced computational load, and reduced power consumption; allocating frequency resources to the group of UEs; computing precoding and/or detection matrix using total channel matrix of the UEs in the group on the allocated frequency resources; and performing MU-MIMO beamforming with the UEs in the group on the allocated frequency resources with AFRs present. - View Dependent Claims (36)
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37. A method for Multi-User Multiple-Input-Multiple-Output (MU-MIMO) communication comprising
a MU-Beamformer using a Line-of-Sight (LoS) dependent frequency including a millimeter-wave frequency with highly directive beams to communicate with a plural of selected User Equipment (UEs); - and
closely located selected UEs communicating using a Device to Device short-range wireless link to coordinate the direction of each UE'"'"'s transmitting and/or receiving beam, such that the UEs tune their transmitting and/or receiving antenna beam directions to facilitate MU-MIMO communication with the multiple beams from the MU-Beamformer and/or one or more Amplify and Forward Relays.
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38. A Multi-User Multiple-Input-Multiple-Output (MU-MIMO) communication system comprising
one or more millimeter-wave MU-Beamformers (MU-BFers) which use multiple LoS dependent highly directive beams to provide wireless backhauls to multiple small cells simultaneously; -
a set of Amplify and Forward Relays (AFBs), working in conjunction with the MU-BFer(s) to overcome the LoS dependence, and/or to increase the multi-path richness of the channel between the MU-BFer(s) and the targeted small cell(s); and a set of small cells operating in a different frequency than the millimeter-wave wireless backhaul.
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39. (canceled)
Specification