Beamforming in a MU-MIMO wireless communication system with relays
First Claim
1. A Multi-User Multiple-Input Multiple-Output (MU-MIMO) wireless communication system comprising:
- a Base Station (BS) with a plurality of antennas, either closely located or distributed;
a plurality of Amplify and Forward Relays (AFRs) deployed over a coverage area, each AFR has NBF>
1 BF antennas with a beam pattern facing a MU-BFer and NUF>
1 UF antennas with a beam pattern facing user equipment (UEs) or downstream AFR(s);
a channel estimation module for estimating the Total Channels between a plurality of UEs and the BS with the AFRs in place; and
wherein the MU-BFer 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 plurality of UEs using the same frequency resource.
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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 N_BF≧1 BF antennas with a beam pattern facing the MU-BFer and N_UF≧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
34 Claims
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1. A Multi-User Multiple-Input Multiple-Output (MU-MIMO) wireless communication system comprising:
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a Base Station (BS) with a plurality of antennas, either closely located or distributed; a plurality of Amplify and Forward Relays (AFRs) deployed over a coverage area, each AFR has NBF>
1 BF antennas with a beam pattern facing a MU-BFer and NUF>
1 UF antennas with a beam pattern facing user equipment (UEs) or downstream AFR(s);a channel estimation module for estimating the Total Channels between a plurality of UEs and the BS with the AFRs in place; and wherein the MU-BFer 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 plurality of UEs using the same frequency resource. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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25. A Multiple-Input Multiple-Output (MIMO) Amplify and Forward Relay (AFR) for MU-MIMO wireless communication system comprising:
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NBF>
2 BF antennas with a beam pattern facing a MU-BFer and NUF>
2 UF antennas with a beam pattern facing user equipment (UEs) or downstream AFR(s);a first RF path for each pair of BF and UF antennas that amplifies and forwards multiple spatially multiplexed RF signals from a Base Station (BS) to one more UEs; a second RF path for each pair of BF and UF that amplifies and forwards multiple spatially multiplexed RF signals from one or more UEs to a BS, wherein the second RF path amplifies and forwards pilot signals from one or more UEs to the BS for estimating the total channels between a plurality of UEs and the BS with the AFRs in place; and a control module that communicates with the BS to configure the AFR to avoid loops with other AFRs in the network, to change the gains and other properties to enhance the MU-MIMO communication between the BS and a plurality of UEs. - View Dependent Claims (26, 27, 28, 29, 30, 31, 32, 33, 34)
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Specification