Adaptive Constellation Map Selection for Wireless Link Reliability

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Solution Overview

Problem

Traditional modulation schemes are not suitable when operating conditions do not match the model assumed during their design, leading to sub-optimal performance due to hardware impairments such as phase noise, nonlinearity, and gain imbalances.

Innovation Solution

Adapting the constellation map used in communication systems to match current operating conditions by determining a target constellation map based on information received from the receiver, which can include candidate constellation maps and operating condition parameters, using machine learning processes to optimize performance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If traditional modulation schemes are used, then the system is simple to implement, but the link performance deteriorates when operating conditions do not match the design model

Engineering Contradiction:

Improvelink performanceVSAvoidadaptability to operating conditions

Core Design Contradiction:

ReliabilityVSAdaptability or versatility

Solution Approach 1:

The patent implements dynamic adaptation of constellation maps by allowing the receiver to determine candidate constellation maps based on current operating conditions and feed back information to the transmitter. The transmitter then selects a target constellation map from the candidates and informs the receiver, enabling the modulation scheme to dynamically adapt to changing conditions such as phase noise, nonlinearity, and gain imbalances.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent changes the parameters of the constellation map by allowing selection from multiple candidate constellation maps with different configurations. The receiver determines candidate maps based on operating condition parameters and feeds back information enabling the transmitter to select an optimal target constellation map that matches current conditions, thereby improving link performance under imperfect operating conditions.

Inventive Principle:

Principle #35Parameter changes

2Reliability

If constellation map adaptation is implemented, then link performance improves under imperfect conditions, but the device complexity increases

Engineering Contradiction:

Improvelink performanceVSAvoidcomplexity of constellation map adaptation

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent implements a feedback mechanism where the receiver determines candidate constellation maps based on current operating conditions and feeds back information (first information or second information) to the transmitter. The transmitter uses this feedback to determine the target constellation map and informs the receiver, creating a closed-loop system that adapts to changing conditions while managing complexity through structured information exchange.

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The receiver autonomously determines candidate constellation maps based on its measurement of current operating conditions without requiring complex transmitter processing. The receiver performs the adaptive selection locally and communicates only the necessary information to the transmitter, allowing the system to adapt to imperfect conditions while keeping the overall device complexity manageable through distributed intelligence.

Inventive Principle:

Principle #25Self-service

3Adaptability or versatility

If multiple candidate constellation maps are considered, then the adaptability to different operating conditions improves, but the information processing requirement increases

Engineering Contradiction:

Improveadaptability to operating conditionsVSAvoidinformation processing overhead

Core Design Contradiction:

Adaptability or versatilityVSLoss of information

Solution Approach 1:

The patent extracts only the essential information needed for constellation map adaptation by having the receiver determine candidate constellation maps and feed back specific information (first information indicating candidate maps or second information for deriving them) to the transmitter. This extracted information is sufficient for the transmitter to select the optimal target constellation map without requiring transmission of complete constellation map data, thereby reducing information processing overhead while maintaining adaptability.

Inventive Principle:

Principle #2Taking out (Extraction)

Data Source

PatentUS20240348487A1Methods and apparatuses for adaptation of communication parameter

Publication Date: 2024.10.17 TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)

AI summary

Methods and apparatuses for adaptation of communication parameter are disclosed. According to an embodiment, a transmitter performs a first transmission to a receiver. The transmitter receives, from the receiver, first information related to one or more candidate constellation maps adapted to one or more current operating conditions, or second information usable for deriving the one or more candidate constellation maps. The transmitter determines a target constellation map based at least on the first information or the second information. The transmitter performs a second transmission to the receiver based on the determined target constellation map.