Multi-Panel Precoder Selection via Segmented Search Space
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Solution Overview
Problem
In 5G wireless communications, calculating channel capacities for multi-panel precoder hypotheses is computationally costly in terms of time, processing speed, and power due to the large number of hypotheses that need to be evaluated.
Innovation Solution
A method is described that reduces the number of precoder hypotheses searched by constructing a search space with multiple levels, calculating channel capacities for a subset of hypotheses, and selecting the best ones, then using these selected hypotheses to further refine the search, thereby reducing the overall computational burden.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If all precoder hypotheses are calculated for channel estimate, then precoder selection accuracy is improved, but computational cost increases significantly
Solution Approach 1:
The patent segments the precoder hypothesis calculation into two distinct phases: wideband precoder hypotheses calculated using average channel statistics, and subband precoder hypotheses calculated using actual channel measurements. This segmentation allows the system to perform comprehensive precoder selection without calculating all possible hypotheses at full resolution, thereby reducing computational power consumption while maintaining selection accuracy.
Solution Approach 2:
The patent performs preliminary calculation of wideband precoder hypotheses using average channel statistics before the actual channel measurement phase. These pre-calculated wideband hypotheses serve as a foundation, reducing the number of hypotheses that need to be fully evaluated during the subband phase, thus reducing overall computational power consumption.
2Measurement precision
If all precoder hypotheses are calculated for channel estimate, then precoder selection accuracy is improved, but processing time increases
Solution Approach 1:
The patent divides the precoder hypothesis evaluation into wideband and subband segments, where wideband hypotheses are evaluated once using average channel statistics, and only subband hypotheses require full evaluation using actual channel measurements. This segmentation significantly reduces the total processing time while maintaining precoder selection accuracy.
Solution Approach 2:
The patent performs preliminary evaluation of wideband precoder hypotheses before the time-critical subband processing. By preparing these hypotheses in advance using computationally efficient average channel statistics, the system reduces the processing time required during actual channel measurements.
3Measurement precision
If all precoder hypotheses are calculated for channel estimate, then precoder selection accuracy is improved, but device complexity increases
Solution Approach 1:
The patent segments the complex precoder hypothesis calculation into two simpler stages: wideband hypothesis generation using average channel statistics, and subband hypothesis refinement using actual measurements. This segmentation reduces device complexity by breaking down a single complex calculation into two manageable stages with different computational requirements.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. One example includes calculating one or more first channel capacities for each precoder hypothesis of a first subset of precoder hypotheses and selecting a first precoder hypothesis of the first subset of precoder hypotheses using the calculated first channel capacities. The example also includes selecting a second subset of precoder hypotheses based on the first precoder hypothesis, calculating one or more second channel capacities for each precoder hypothesis of the second subset of precoder hypotheses, and selecting a second precoder hypothesis of the second subset of precoder hypotheses using the calculated second channel capacities. The example also includes selecting grouping co-phase factors based at least in part on the first precoder hypothesis or the second precoder hypothesis and transmitting a first precoding matrix indicator that indicates a first precoder index based on the one or more grouping co-phase factors.