Compressed ELR PPDU Preamble for Long-Range Channel Estimation

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Solution Overview

Problem

Existing wireless communication protocols face inefficiencies in long-range data transmission due to redundant information in preambles, leading to increased overhead and reduced channel estimation accuracy.

Innovation Solution

The implementation of an extended long-range (ELR) PPDU that reduces redundant information in the preamble, allowing improved channel estimation through predetermined parameters, thereby enhancing data transmission efficiency and range.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If redundant information is included in the preamble for channel estimation, then channel estimation accuracy is improved, but transmission overhead increases

Engineering Contradiction:

Improvechannel estimation accuracyVSAvoidpreamble overhead

Core Design Contradiction:

Measurement precisionVSQuantity of substance

Solution Approach 1:

The patent extracts only the essential channel estimation information from the traditional preamble structure, removing redundant elements. The compressed PPDU format retains only the critical training fields needed for channel estimation while eliminating duplicate or unnecessary signaling information, thereby reducing overhead while preserving estimation accuracy.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent changes the parameters of the preamble by modifying its structure and content based on the ELR transmission characteristics. Instead of using the standard preamble format designed for shorter ranges, the patent adapts the preamble parameters (training field duration, pilot density, signal repetition) to optimize for extended long-range operations, achieving better efficiency without sacrificing estimation performance.

Inventive Principle:

Principle #35Parameter changes

2Adaptability or versatility

If traditional preamble structure is used for long-range transmission, then compatibility is maintained, but transmission efficiency decreases

Engineering Contradiction:

Improveprotocol compatibilityVSAvoidtransmission efficiency

Core Design Contradiction:

Adaptability or versatilityVSProductivity

Solution Approach 1:

The patent segments the PPDU structure into distinct functional parts: a compressed preamble section optimized for ELR operations and a payload section that maintains standard formatting. This segmentation allows the preamble to be optimized for long-range efficiency while the rest of the protocol stack maintains full compatibility with existing IEEE 802.11 infrastructure.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent introduces dynamic elements into the preamble structure, allowing certain fields to be adjusted or omitted based on transmission conditions and capabilities. The compressed format enables dynamic adaptation of preamble length and content while maintaining backward compatibility through optional field inclusion and versioning mechanisms.

Inventive Principle:

Principle #15Dynamics

Data Source

PatentEP4672688A1Compressed long range physical layer protocol data unit (PPDU)

Publication Date: 2025.12.31 COMCAST CABLE COMM LLC

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AI summary

A station may send a data unit to an access point. A preamble of the data unit may be used for estimating a channel associated with sending the data unit. Predetermined parameters (e.g., as indicated by the access point) may be used in the preamble, such that improved channel estimation and/or reduced overhead may be realized, for example, in a long-range data transmission.