Link Pre-Equalization Using Offline Tables for 5G Non-Flatness

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Solution Overview

Problem

Existing technologies struggle to effectively compensate for non-flatness issues in 5G ultra-wideband wireless communication links, as conventional equalization circuits are inadequate for large-bandwidth irregularities and have limited accuracy.

Innovation Solution

A pre-equalization compensation method that utilizes a prestored off-line compensation table to combine RF and wave control link non-flatness coefficients, enabling improved signal flatness through linear interpolation and normalization, without requiring complex equalization circuits.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If conventional equalization circuits are used for compensation, then linear non-flatness can be corrected, but large-bandwidth irregular non-flatness cannot be effectively compensated and the compensation accuracy is limited

Engineering Contradiction:

Improvecompensation accuracyVSAvoidcapability to compensate irregular non-flatness

Core Design Contradiction:

Measurement precisionVSAdaptability or versatility

Solution Approach 1:

The patent changes the compensation parameters by using a pre-stored compensation table with multiple parameters corresponding to different frequency points, replacing the single-parameter approach of conventional equalization circuits. This allows the system to select and apply appropriate compensation parameters for each frequency point, achieving accurate compensation for large-bandwidth irregular non-flatness

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent performs preliminary compensation by pre-storing compensation parameters in a compensation table before actual operation. The compensation parameters are calculated and stored in advance for various frequency points, enabling the system to quickly apply the appropriate compensation without real-time calculation, thus improving both accuracy and efficiency

Inventive Principle:

Principle #10Preliminary action

2Measurement precision

If high-order filter circuits are used in intermediate frequency link, then some non-flatness can be corrected, but the device complexity increases and compensation accuracy remains limited

Engineering Contradiction:

Improvecompensation accuracyVSAvoidcomplexity of equalization circuit

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The patent replaces the mechanical/electrical equalization circuit with a digital signal processing approach. Instead of using complex analog or intermediate frequency filter circuits, the system uses a baseband processing unit to retrieve compensation parameters from a pre-stored table and apply digital compensation, significantly reducing device complexity while improving accuracy

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent uses a pre-stored compensation table that contains pre-calculated compensation parameters for different frequency points. This copying approach allows the system to directly retrieve and apply the appropriate compensation parameters without performing complex real-time calculations or using complex hardware circuits

Inventive Principle:

Principle #26Copying

3Adaptability or versatility

If multi-carrier and ultra-wideband AAU is deployed to meet adaptability requirements, then frequency band coverage is improved, but non-flatness problems within and between carriers become more prominent

Engineering Contradiction:

Improvefrequency band adaptabilityVSAvoidsignal flatness

Core Design Contradiction:

Adaptability or versatilityVSMeasurement precision

Solution Approach 1:

The patent applies local quality by using different compensation parameters for different frequency points and carriers. The pre-stored compensation table contains specific parameters tailored to each frequency point's characteristics, allowing the system to address the unique non-flatness issues of each carrier and frequency band, thereby maintaining signal flatness across the entire ultra-wideband range

Inventive Principle:

Principle #3Local quality

Data Source

PatentEP4064631B1Link pre-equalization compensation method, device, storage medium, and electronic device

Publication Date: 2025.11.12 ZTE CORP

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AI summary

The present disclosure provides a pre-equalization compensation method and device for a link, a storage medium and an electronic device. The method includes: in response to that an Active Antenna Unit (AAU) is powered on, parsing a prestored off-line compensation table to obtain first non-flatness equalization coefficients of an RF link with a plurality of sub-carriers and second non-flatness equalization coefficients of a wave control link with the plurality of sub-carriers, with each one of the plurality of sub-carriers corresponding to one of the first non-flatness equalization coefficients and one of the second non-flatness equalization coefficients; combining the first non-flatness equalization coefficients of the plurality of sub-carriers and the second non-flatness equalization coefficients of the plurality of sub-carriers to obtain a combined carrier non-flatness coefficient; and performing equalization compensation on the link according to the combined carrier non-flatness coefficient.