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.
Claims20
A method for estimating MU-MIMO channel information comprising a BS obtaining SU-MIMO channel information of a plural of UEs;
- the BS estimating the MU-MIMO channel information for the plural of UEs using the SU-MIMO channel information;
- after estimate of the MU-MIMO channel information is obtained, the BS choosing a modulation and channel coding appropriate for the quality of the MU-MIMO channels.
A method for choosing a MU-MIMO precoding comprising BS acquiring channel information of a plural of UEs scheduled on the current resource allocation;
- BS calculating the sum capacity of the plural of UEs under MU-MIMO based on a first precoding;
- BS calculating the sum capacity of the plural of UEs under MU-MIMO based on a second precoding;
- and BS choosing the precoding method that has the higher capacity.
A method for compensating hardware impairments and circuit conditions in precoding comprising storing Hardware Impairment Parameters (HIP) of UEs in a database;
- BS acquiring the Unique Device Identity (UDID) information of a UE;
- BS using the UDID to obtain the HIP of the UE from a database;
- and BS using the HIP in the precoding to compensate hardware impairments and circuit conditions in the UE.
Dependencies are inferred from the claim text.