CIR Feedback Using Thresholded Tap Quantization in UWB
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Solution Overview
Problem
Current UWB communication systems face high channel impulse response (CIR) feedback overheads due to the quantization of all CIR taps, including those with small amplitudes that contribute minimally to sensing results, leading to inefficient resource utilization.
Innovation Solution
A method where only CIR taps with amplitudes greater than or equal to a threshold are quantized and fed back, reducing the number of taps and signaling overheads while maintaining sensing performance by ignoring the impact of taps with small amplitudes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If all CIR taps are quantized and fed back, then sensing accuracy is maintained, but signaling overheads increase
Solution Approach 1:
The patent extracts only the significant CIR taps (those with amplitudes above a threshold) from the complete CIR data and feeds back only these extracted taps. This selective extraction reduces the volume of feedback data while preserving the essential sensing information contained in the dominant taps, thereby resolving the contradiction between maintaining sensing accuracy and reducing signaling overheads.
Solution Approach 2:
The patent applies different quality requirements to different CIR taps based on their amplitude characteristics. Significant taps with amplitudes above the threshold are quantized and fed back with full precision, while taps below the threshold are discarded. This local differentiation in quality handling optimizes the balance between sensing accuracy and feedback overhead by allocating resources only where necessary.
2Reliability
If all CIR taps are fed back, then complete channel information is provided, but resource utilization decreases
Solution Approach 1:
The patent extracts only the essential CIR taps that contain meaningful channel information above a certain amplitude threshold. By removing redundant low-amplitude taps, the system provides complete useful channel information without the bloat of unnecessary data, thereby improving resource utilization while maintaining reliability.
Solution Approach 2:
The patent applies partial action by feeding back only a subset of CIR taps rather than all taps. This partial feedback approach is sufficient for maintaining reliable sensing performance while significantly reducing the resources required for data transmission and processing.
Data Source
AI summary
A channel impulse response (CIR) feedback method and an apparatus are provided. A second communication apparatus sends a second signal, and a first communication apparatus receives a first signal obtained through channel transmission on the second signal, and sends a CIR report corresponding to the first signal. The CIR report indicates a quantization result of each first CIR tap in at least one continuous time period, and an amplitude of the first CIR tap is greater than or equal to a first threshold. Based on this solution, the first communication apparatus feeds back, to the second communication apparatus, a quantization result of each CIR tap whose amplitude is greater than or equal to a threshold in the at least one continuous time period.