BEAMFORMING IN A MU-MIMO WIRELESS COMMUNICATION SYSTEM WITH RELAYS
First Claim
1. A MU-MIMO wireless communication system comprisingA 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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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.
68 Citations
39 Claims
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1. A MU-MIMO wireless communication system 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. - 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. An MIMO AFR for MU-MIMO wireless communication system comprising
NBF≧ - 2 BF antennas with a beam pattern facing a MU-BFer and NUF≧
2 UF antennas with a beam pattern facing 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 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; and
,The second RF path amplifies and forwards pilot signals from one or more UEs to the BS for estimating the total channels between a plural 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 plural of UEs. - View Dependent Claims (26, 27, 28, 29, 30, 31, 32, 33, 34)
- 2 BF antennas with a beam pattern facing a MU-BFer and NUF≧
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35. A method for user grouping and frequency resource in a MIMO network with AFRs comprising estimating the total channel parameters, including but not limited to, correlations, delay spreads or coherence bandwidth, CQI, CEE and SII of the total channels of different UEs;
- selecting those UEs into a group based on their total channel parameters such that it improves system performance when AFRs are present, including but not limited to, improved MU-MIMO beamforming, increased system throughput, reduced computational load, 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 UEs in the group on the allocated frequency resources with AFRs present. - View Dependent Claims (36)
- selecting those UEs into a group based on their total channel parameters such that it improves system performance when AFRs are present, including but not limited to, improved MU-MIMO beamforming, increased system throughput, reduced computational load, reduced power consumption;
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37. A method for MU-MIMO with closed located UEs in a communication system using a LoS dependent frequency with highly directive beams comprising closely located 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 a MU-BFer and/or one or more AFRs.
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38. A MU-MIMO communication system with comprising one or more MU-BFers using LoS dependent highly directive beams to provide wireless backhauls to small cells;
- a set of AFRs working in conjunction with the MU-BFer(s) to extend the coverage of 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 wireless backhaul.
- a set of AFRs working in conjunction with the MU-BFer(s) to extend the coverage of 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
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39. A method of MU-MIMO communication comprising estimating the number of RF paths and/or antennas needed in a MU-MIMO system based on the number of UEs, SINR needed to support the desired modulation and coding scheme, and estimation of channels;
- and turning on a sufficient number of RF paths and/or antennas to perform the MU-MIMO communication.
Specification