Receiver Channel Estimation Using Selective Path Extraction
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Solution Overview
Problem
Existing channel estimation methods in radio communications inaccurately estimate paths with zero power, leading to decreased estimation accuracy due to noise and interference.
Innovation Solution
A receiver apparatus with a channel estimator that calculates interim channel impulse response, extracts paths by power order, and iteratively refines channel impulse response estimation, using Bayesian information criterion to select the best estimation value.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If all paths from preceding path to path having predetermined delay time are estimated, then channel estimation coverage is improved, but estimation accuracy deteriorates due to noise and interference in unnecessary paths
Solution Approach 1:
The patent extracts only the necessary paths (non-zero power paths) from the complete set of estimated paths. The path extracting unit identifies and selects paths with non-zero power values, excluding paths with zero power that contain only noise and interference, thereby improving estimation accuracy while maintaining coverage of actual channel components
Solution Approach 2:
The patent applies different handling to different paths based on their local characteristics (power values). Paths with non-zero power are retained for channel estimation, while paths with zero power are discarded. This local differentiation ensures that only paths with actual signal content contribute to the estimation, improving overall accuracy
2Measurement precision
If path extraction and iteration processes are added to improve accuracy, then estimation accuracy is improved, but device complexity increases
Solution Approach 1:
The channel estimator is segmented into distinct functional units: interim channel impulse estimating unit, path extracting unit, channel impulse response estimating unit, and frequency response estimating unit. This segmentation organizes the complex processing into manageable stages, making the system more maintainable and easier to implement while achieving high accuracy
Solution Approach 2:
The patent implements a dynamic path extraction process that can adapt to different channel conditions. The path extracting unit dynamically identifies non-zero power paths based on the actual estimated channel impulse response, allowing the system to adjust the number and selection of paths processed, thereby managing complexity based on actual channel requirements
Data Source
AI summary
A receiver apparatus includes a channel estimator (b106) to perform channel estimation. The channel estimator includes an interim channel impulse estimating unit (b106-1) that calculates an interim channel impulse response estimation value, a path extracting unit (b106-3) that extracts a path for use in calculation of a channel impulse response estimation value from among paths forming the interim channel impulse response estimation values, a channel impulse response estimating unit (b106-4) that calculates the channel impulse response estimation value using the path extracted by the path extracting unit, and a frequency response estimating unit (b106-5) that converts the channel impulse response estimation value into a frequency response estimation value by time-frequency transforming the channel impulse response estimation value. In this way, a receiver apparatus capable of performing accurate channel estimation results.