Precoding Weight Calculation Across Subcarriers to Reduce Interference
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Solution Overview
Problem
In multi-antenna systems, the synthesized direction of channels obtained using existing precoding weight calculation methods significantly differs from the direction of individual subcarriers, leading to large signal interference.
Innovation Solution
A method involving obtaining first and second channel estimation values for subcarriers, calculating equivalent channel matrices and coefficients, and using these to derive precoding weights that consider the directions of channels for multiple subcarriers, thereby reducing interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the base station combines all channel estimation values in one RBG to obtain a combined channel estimation value, then the precoding weight can be obtained, but large signal interference exists because the synthesized direction is greatly different from the direction of the channel corresponding to each subcarrier
Solution Approach 1:
The patent divides the RBG into multiple sub-RBGs, where each sub-RBG contains a subset of subcarriers. Instead of combining all channel estimation values in the entire RBG, the base station separately processes channel estimation values within each sub-RBG to obtain sub-precoding weights. This segmentation reduces the directional deviation and signal interference while maintaining calculation efficiency.
2Device complexity
If the base station calculates precoding weight based on combined channel estimation value from all subcarriers in RBG, then computation is simplified, but the synthesized direction differs significantly from individual subcarrier directions
Solution Approach 1:
The patent segments the RBG into multiple sub-RBGs, each handling a subset of subcarriers. This segmentation maintains calculation simplicity while improving channel direction accuracy, as each sub-RBG processes fewer subcarriers and thus maintains better directional consistency.
Solution Approach 2:
The patent applies different precoding weight calculations to different sub-RBGs based on their local channel characteristics. Each sub-RBG generates its own sub-precoding weight tailored to its specific subcarrier set, improving local channel direction accuracy while maintaining overall system efficiency.
Data Source
AI summary
A precoding weight calculation method and a related apparatus to provide improved communication quality. First channel estimation values and a plurality of second channel estimation values are obtained based on a resource block group. A first equalization coefficient is obtained based on the first channel estimation values. A second equalization coefficient is obtained based on the second channel estimation values. A plurality of first equivalent channel coefficients are obtained based on the first equalization coefficient. A plurality of second equivalent channel coefficients are obtained based on the second equalization coefficient. A first precoding weight and a second precoding weight are obtained based on the plurality of first equivalent channel coefficients and the plurality of second equivalent channel coefficients.