Non-linear Precoding Based on CSI Accuracy Segmentation
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Solution Overview
Problem
Current non-linear precoding techniques, such as Tomlinson-Harashima (THP) precoding, face high complexity in finding optimal user ordering, leading to suboptimal performance in cellular systems, especially in 5G new radio (NR) systems, due to the complexity of determining the ideal ordering of user data for pre-coding processing.
Innovation Solution
A leveled ordering scheme is implemented, where the network device divides the bandwidth into frequency band ranges based on the accuracy of channel state information (CSI) fed back by terminal devices, performing non-linear precoding within each range to balance performance and complexity, thereby reducing implementation complexity and overhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If optimal user ordering is found by exhausting all orderings, then precoding performance is improved, but implementation complexity increases significantly
Solution Approach 1:
The patent divides the bandwidth into multiple frequency band ranges and applies different ordering schemes to different segments. This segmentation allows the system to use exhaustive ordering only in specific frequency ranges where it provides the most benefit, while using simpler ordering approaches in other ranges, thereby reducing overall complexity while maintaining performance.
Solution Approach 2:
The patent applies different ordering strategies to different frequency band ranges based on local conditions. In frequency bands with high CSI accuracy, optimal ordering is applied; in bands with lower CSI accuracy, simpler ordering is used. This local differentiation resolves the contradiction by tailoring the complexity to the actual performance needs of each frequency segment.
2Device complexity
If direct ordering based on channel gain magnitudes is used, then implementation complexity is reduced, but precoding performance degrades significantly
Solution Approach 1:
The patent segments the frequency spectrum into multiple band ranges and applies different ordering approaches to each segment. This allows the system to use performance-optimized ordering in specific frequency ranges rather than applying a single simple ordering scheme across the entire bandwidth, thus improving performance without uniformly increasing complexity.
Solution Approach 2:
The patent changes the ordering parameter (ordering strategy) based on frequency band and CSI accuracy conditions. By dynamically selecting between different ordering approaches based on system conditions, the patent achieves better performance while controlling complexity through adaptive parameter selection rather than fixed simple ordering.
3Device complexity
If bandwidth is divided into frequency band ranges based on CSI accuracy, then complexity is reduced, but requires additional CSI accuracy feedback overhead
Solution Approach 1:
The patent extracts only the necessary CSI accuracy information from the full CSI feedback and uses it specifically for frequency band segmentation and ordering decisions. By taking out only the essential accuracy metric rather than processing complete CSI for all bands, the system reduces processing complexity while minimizing the additional feedback overhead to only what is strictly necessary for the segmentation strategy.
Data Source
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AI summary
Embodiments of the present disclosure relate to a method for precoding, a network device and a computer readable storage medium. For example, at a network device configured with a plurality of antennas and configured to operate in a plurality of frequency bands, channel state information (CSI) and an indication of a plurality of CSI accuracies corresponding to the CSI are obtained from a plurality of terminal devices. The bandwidth of the plurality of frequency bands is divided into one or more frequency band ranges based on comparison of each CSI accuracy with a first threshold accuracy, and ordering and precoding are performed, based on the CSI, on a plurality of data to be transmitted to the plurality of terminal devices within each frequency band range. Within each frequency band range, the plurality of precoded data is transmitted to the plurality of terminal devices via the plurality of antennas.