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US 10,826,583 B2Granted
Adaptive precoding in a MIMO wireless communication system
AssigneeRF DSP Inc.
InventorsDengkui Zhu, Ping Liang
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Abstract
This invention presents methods for estimating MU-MIMO channel information using SU-MIMO channel information to choose a modulation and channel coding appropriate for the quality of the MU-MIMO channels, for adaptively selecting MU-MIMO precoding methods based on estimations of a plural of UEs and for compensating hardware impairments in MU-MIMO precoding.
Claims5
A method for estimating Multi-User Multiple Input Multiple Output (MU-MIMO) channel information comprising:
- a Base Station (BS) transmitting test or pilot signals to a plural of User Equipment and the UEs feeding back their channel information to the BS, wherein the UEs and the BS operate in an Frequency-Division Duplex (FDD) system;
- the BS obtaining Single-User Multiple Input Multiple Output (MU-MIM) channel information of the plural of UEs;
- the BS estimating the MU-MIMO channel information for the plural of UEs using the SU-MIMO channel information, and calculating an error in the channel information estimates other than that caused by quantization error as a function of the distance between two different vectors in a codebook set;
- and after estimate of the MU-MIMO channel information and the error in the channel information estimates are obtained, the BS choosing a modulation and channel coding appropriate for the quality of the MU-MIMO channels and the error in the channel information estimates.
1 more element
Dependencies are inferred from the claim text.