Truncated CSI Feedback for Low-Overhead Channel Estimation

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Solution Overview

Problem

Existing wireless communication systems face challenges in accurately providing channel state information (CSI) feedback due to the overhead associated with feeding back all time-domain channel response samples, leading to inaccurate sensing results and loss of information.

Innovation Solution

A truncated CSI feedback system that feeds back only time-domain samples containing the main peaks and significant power tails of the channel impulse response, using techniques like super-resolution algorithms and compressed sensing to reconstruct the underlying multipaths.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If all time-domain channel response samples are fed back, then channel estimation accuracy is improved, but feedback overhead increases

Engineering Contradiction:

Improvechannel estimation accuracyVSAvoidfeedback overhead

Core Design Contradiction:

Measurement precisionVSLoss of information

Solution Approach 1:

The patent extracts and feeds back only the significant portions of the channel impulse response (main peaks and power tails) rather than all time-domain samples. This selective extraction reduces feedback overhead while preserving the essential channel characteristics needed for accurate estimation.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent changes the representation parameters by transforming the channel response into a truncated format that captures only the most significant components (main peaks and power tails). This parameter transformation maintains estimation accuracy while reducing the amount of feedback data.

Inventive Principle:

Principle #35Parameter changes

2Loss of information

If truncated feedback is used, then feedback overhead is reduced, but sensing accuracy deteriorates

Engineering Contradiction:

Improvefeedback overheadVSAvoidsensing accuracy

Core Design Contradiction:

Loss of informationVSMeasurement precision

Solution Approach 1:

The patent applies local quality by differentiating between significant and insignificant portions of the channel response. The main peaks and power tails are identified as containing the essential sensing information, while other portions are discarded. This selective retention of locally significant features maintains sensing accuracy with reduced overhead.

Inventive Principle:

Principle #3Local quality

3Loss of information

If all channel response samples are transmitted, then information completeness is improved, but communication efficiency deteriorates

Engineering Contradiction:

Improveinformation completenessVSAvoidcommunication efficiency

Core Design Contradiction:

Loss of informationVSProductivity

Solution Approach 1:

The patent extracts only the essential components (main peaks and power tails) from the complete channel response for transmission. This extraction process maintains information completeness for sensing purposes while significantly improving communication efficiency by reducing the transmitted data volume.

Inventive Principle:

Principle #2Taking out (Extraction)

Data Source

PatentUS12532203B2Truncated channel state information feedback

Publication Date: 2026.01.20 INTEL CORP

AI summary

This disclosure describes systems, methods, and devices related to truncated channel state information (CSI) feedback. A device may establish a communication link with a station device. The device may identify a feedback frame received from the station device, wherein the feedback frame comprises information associated with channel state information (CSI). The device may identify the feedback frame as one or more feedback samples.