Channel Estimation Accuracy via Frequency Band Group Segmentation
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Solution Overview
Problem
In LTE systems, channel estimation errors occur due to amplitude and phase changes of frequency response estimation values at the boundaries of frequency band groups when overall estimation is used, leading to inaccuracies in signal reception and demodulation.
Innovation Solution
Independent channel estimation is performed in each frequency band group, dividing the bandwidth into distinct groups corresponding to different antenna ports, to avoid estimation deviations and improve accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If overall channel estimation is used across the entire bandwidth, then the estimation process is simplified and covers the full bandwidth, but estimation accuracy deteriorates at frequency band group boundaries due to amplitude and phase changes
Solution Approach 1:
The patent divides the overall bandwidth into multiple frequency band groups, with each group corresponding to a specific antenna port. Channel estimation is performed independently within each frequency band group rather than across the entire bandwidth. This segmentation resolves the boundary estimation errors by ensuring that estimation does not cross frequency boundaries where amplitude and phase changes occur between different antenna ports, thereby improving measurement precision while maintaining manageable process complexity through structured division.
2Measurement precision
If independent channel estimation is performed in each frequency band group, then estimation accuracy is improved by avoiding boundary errors, but the complexity of the estimation process increases
Solution Approach 1:
The bandwidth is divided into multiple frequency band groups, each associated with a specific antenna port, enabling independent channel estimation within each group. This segmentation improves measurement precision by eliminating boundary estimation errors that occur when estimation crosses frequency bands with different antenna port characteristics.
Solution Approach 2:
The patent applies local quality by performing channel estimation with characteristics specific to each frequency band group and antenna port. Each frequency band group undergoes estimation tailored to its local conditions rather than applying a uniform estimation approach across the entire bandwidth. This localized approach improves accuracy by adapting to the specific amplitude and phase characteristics of each band group while maintaining systematic process management.
Data Source
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AI summary
Embodiments of the present invention provide a channel estimation processing method and an apparatus. The channel estimation processing method includes: receiving cell-specific reference signals CRSs that are sent by a base station by using at least two antenna ports, where bandwidth occupied by the CRSs is divided into at least two frequency band groups, one frequency band group corresponds to one antenna port, and each frequency band group includes at least one frequency band; and performing independent channel estimation in each of the at least two frequency band groups according to the CRSs. According to the embodiments of the present invention, accuracy of channel estimation can be improved by performing independent channel estimation in each frequency band group.