Precoding Matrix Indicator Selection Using Identity Matrix Weighting
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Solution Overview
Problem
The accuracy of Precoding Matrix Indication (PMI) selection in SU-MIMO systems is affected by issues such as terminal support for sounding signals, sounding measurement period, and frequency band resources, leading to performance degradation.
Innovation Solution
A method where the base station actively initiates PMI selection without relying on a sounding signal, by instructing the terminal to send uplink data weighted by an identity matrix, allowing for accurate PMI selection and improved SU-MIMO performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If PMI selection is performed based on sounding measurement, then the system can obtain channel state information, but the accuracy of PMI selection is affected by terminal support for sounding signals, sounding measurement period, and frequency band resources
Solution Approach 1:
The patent introduces an intermediary mechanism where the base station sends indication information to trigger uplink data transmission with identity matrix weighting, and uses the received uplink data as a mediator to estimate channel state information. This intermediary approach bypasses the need for terminal support of sounding signals while still enabling accurate PMI selection through the base station's own processing of the uplink data.
Solution Approach 2:
The patent replaces the mechanical sounding signal transmission mechanism with a substitute approach using uplink data transmission. Instead of relying on the terminal to send dedicated sounding signals, the system substitutes this with regular uplink data transmission that is weighted by an identity matrix, allowing the base station to extract channel state information from the uplink data itself.
2Measurement precision
If sounding measurement period is extended to improve measurement accuracy, then PMI selection accuracy improves, but system responsiveness and productivity decrease
Solution Approach 1:
The patent enables continuous channel state information acquisition by utilizing ongoing uplink data transmissions instead of periodic sounding measurements. The base station continuously receives uplink data and can continuously estimate channel state information, maintaining system responsiveness while achieving accurate PMI selection without the need to extend measurement periods.
3Measurement precision
If sounding signals are used for PMI selection, then channel state information can be obtained, but frequency band resources are consumed and PMI selection accuracy is limited
Solution Approach 1:
The patent makes uplink data transmission serve multiple functions: it simultaneously carries user data and enables channel state information estimation for PMI selection. This multi-functionality eliminates the need for separate sounding signals, reducing frequency band resource consumption while maintaining or improving PMI selection accuracy through the dual-purpose utilization of uplink resources.
Data Source
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AI summary
Embodiments of the present invent provide a method for selecting a precoding matrix indication, an apparatus and a system, which are applied to the communications field and used to solve a problem in the prior art where PMI selection is inaccurate and this inaccuracy finally causes deterioration of system performance. The technical solution provided by the present invention includes: a base station sends indication information to a terminal to instruct the terminal to send uplink data without weighting the uplink data or after weighting the uplink data by using an identity matrix; the base station selects a proper PMI from a PMI set according to the uplink data sent by the terminal and sends the PMI to the terminal.