Wireless Channel Prediction Using Tap Location Error Detection
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Solution Overview
Problem
Existing channel prediction methods for wireless apparatuses fail to accurately predict impulse responses when the tap location corresponding to each path differs between impulse responses at different time points, leading to unreliable throughput performance.
Innovation Solution
A wireless apparatus is equipped with a channel estimation part to acquire estimated impulse responses, a tap location error detection part to detect errors between impulse responses at different times, and a channel prediction part to calculate a predicted impulse response using the estimated impulse responses and tap location errors, enabling accurate prediction even when tap locations differ.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If channel prediction is performed using existing methods, then prediction can be made, but prediction accuracy deteriorates when tap locations differ between impulse responses at different time points
Solution Approach 1:
The patent segments the channel prediction process into three distinct functional parts: channel estimation (acquiring impulse response), tap location error detection (identifying misalignment), and channel prediction (calculating future channel state). This segmentation allows each part to be optimized independently, particularly enabling the tap location error detection to correct alignment issues before prediction, thereby maintaining accuracy despite temporal variations in tap locations
Solution Approach 2:
The patent introduces tap location error detection as an intermediary component between channel estimation and channel prediction. This intermediary detects the tap location error (shift amount) between impulse responses at different time points and provides correction information to the channel prediction part, ensuring accurate alignment and prediction even when channel conditions change over time
2Productivity
If beamforming is performed using channel information acquired at an earlier time, then beamforming can be executed, but throughput performance degrades due to temporal channel variations
Solution Approach 1:
The patent performs preliminary channel prediction to estimate the future channel state at the time of beamforming execution, based on channel information acquired earlier. The channel prediction part calculates the predicted impulse response by compensating for temporal variations and tap location shifts, providing accurate channel information in advance for beamforming, thus maintaining high throughput performance
Solution Approach 2:
The patent implements a feedback mechanism where the tap location error detection continuously monitors the alignment between impulse responses at different time points and feeds back the detected error to the channel prediction process. This feedback loop enables dynamic adjustment of the prediction to account for temporal channel variations, ensuring stable beamforming performance
Data Source
AI summary
A wireless apparatus includes a channel estimation part that acquires an estimated impulse response which is an estimate value of an impulse response of a channel between a wireless terminal and the wireless apparatus, a tap location error detection part that detects a tap location error between estimated impulse responses at different time points out of the estimated impulse responses, and a channel prediction part that calculates a predicted impulse response which is an impulse response of the channel at a future time point by using the estimated impulse responses and the tap location error.