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.
Claims17
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A method of user grouping to improve MU-MIMO beamforming comprising calculating correlations of the channels of different UEs;
- selecting UEs with low channel correlation 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 UEs in the group on the allocated frequency resource.
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 UEs in the group on the allocated frequency resource.
Dependencies are inferred from the claim text.