Multi-user precoding

By classifying users of a multi-user multi-antenna transmitter into linear and nonlinear precoding groups and combining spatial correlation value and power allocation, the problems of performance degradation of linear precoding under high correlation and high complexity of nonlinear precoding are solved, achieving a balance between performance and complexity.

CN115428345BActive Publication Date: 2025-09-05TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)
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Patent Information

Application Number
CN202080099168.6
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2020-04-01
Publication Date
2025-09-05
Estimated Expiration
2040-04-01

AI Technical Summary

Technical Problem

The linear precoding of existing multi-user multi-antenna transmitters deteriorates when the correlation between users increases, while nonlinear precoding is highly complex and lacks an effective solution suitable for high correlation.

Method used

By classifying users into a first group and a second group, linear and nonlinear precoding are applied respectively, linear precoding is used for the first group and nonlinear precoding is used for the second group, and signal generation of the user groups is optimized by determining spatial correlation values ​​and power allocation coefficients.

Benefits of technology

The complexity is reduced while maintaining performance, and a precoding method suitable for multi-user multi-antenna transmitters with high correlation is provided, which reduces the calculation and transmission power requirements.

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Abstract

Disclosed is a precoding method for a multi-user multi-antenna transmitter configured to transmit corresponding signals to multiple users. The method includes: determining (for each pair of users among the multiple users) a spatial correlation value of the pair of users; classifying the multiple users into a first group and a second group based on the spatial correlation value; generating corresponding signals for transmission to users in the first group by applying linear precoding; and generating corresponding signals for transmission to users in the second group by applying nonlinear precoding. For example, when all pairs including a specific user have spatial correlation values ​​below a first correlation threshold, the specific user can be classified into the first group, and when at least one pair including the specific user has a spatial correlation value equal to or above the first correlation threshold, the specific user can be classified into the second group. Corresponding devices, transmitters, base stations, and computer program products are also disclosed.
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Citation Information

Patent Citations

  • Active user selection in massive MIMO

    US20180352523A1

  • Communication method and device for nonlinear precoding

    CN108418614A