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US 10,594,377 B2Granted
Beamforming in a MU-MIMO wireless communication system
AssigneeRF DSP Inc.
InventorsPing Liang, Dengkui Zhu, Boyu Li
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Abstract
This invention provides methods for Distributed Massive MIMO (DM-MIMO) that use one or more central Baseband Units (BBUs), one or more Multi-User Beamformers for each BBU performing multi-user MIMO computations, and a number of RRHs distributed over a geographic area.
Claims4
A method of user grouping to improve MU-MIMO beamforming comprising calculating correlations of channels of different UEs;
- selecting UEs with low channel correlation into a group;
- allocating frequency resources to the group of UEs;
- computing preceding and/or detection matrix using 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 resource.
1 more element
A method of user grouping for efficient MU-MIMO beamforming computation comprising estimating the delay spreads or coherence bandwidth of the channels of different UEs;
- selecting UEs with similar delay spreads or coherence bandwidth into a group;
- allocating frequency resources to the group of UEs;
- computing precoding and/or detection matrix using 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 resource.
1 more element
Dependencies are inferred from the claim text.