Non-overlapping PT-RS Subcarrier Sets for Phase Noise Mitigation

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

High-frequency wireless communication systems face challenges in phase noise compensation and interference management, particularly at frequencies above 52.6 GHz, where existing phase tracking reference signals (PTRS) struggle with phase noise effects and inter-carrier interference (ICI), necessitating improved algorithms and signal processing techniques.

Innovation Solution

The implementation of a method using non-overlapping sets of subcarriers for first and second Phase Tracking Reference Signaling (PT-RS), with configurable muting and cyclic shifts, to enhance phase noise estimation and interference suppression, allowing for efficient phase tracking and data transmission in high-frequency bands.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If Phase Tracking Reference Signaling is transmitted on overlapping subcarriers, then frequency resource utilization is improved, but phase noise estimation accuracy deteriorates due to inter-carrier interference

Engineering Contradiction:

Improvefrequency resource utilizationVSAvoidphase noise estimation accuracy

Core Design Contradiction:

ProductivityVSMeasurement precision

Solution Approach 1:

The patent divides the frequency spectrum into non-overlapping subcarrier sets for different PT-RS transmissions. Each PT-RS signal is assigned to a distinct subset of subcarriers, preventing inter-carrier interference while maintaining efficient frequency resource utilization through configurable muting patterns and cyclic shifts.

Inventive Principle:

Principle #1Segmentation

2Reliability

If multiple transmission points use simultaneous communication links, then communication reliability is improved, but interference management complexity increases

Engineering Contradiction:

Improvecommunication reliabilityVSAvoidinterference management complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent applies local quality by assigning different muting patterns and cyclic shift values to PT-RS signals from different transmission points. This allows each TRP to transmit simultaneously on overlapping frequency resources while maintaining distinguishable, non-interfering reference signals through localized parameter differentiation.

Inventive Principle:

Principle #3Local quality

3Reliability

If beamforming is used at high frequencies, then communication performance is improved, but phase noise effects worsen

Engineering Contradiction:

Improvecommunication performanceVSAvoidphase noise effects

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent introduces PT-RS as an intermediary reference signal that mediates between the transmitted data signal and the receiver. By providing dedicated phase tracking references on non-overlapping subcarriers with configurable muting, the system enables accurate phase noise estimation and compensation, thereby mitigating the harmful phase noise effects inherent in high-frequency beamforming communication.

Inventive Principle:

Principle #24Intermediary (Mediator)

Data Source

PatentUS11824803B2Phase tracking reference signaling for a wireless communication network

Publication Date: 2023.11.21 TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)

AI summary

There is disclosed a method of operating a receiving radio node in a wireless communication network. The method includes receiving first signaling and second signaling, the first signaling including first Phase Tracking Reference Signaling, PT-RS, on a first set of subcarriers, and the second signaling including second PT-RS on a second set of subcarriers, the first set of subcarriers being non-overlapping with the second set of subcarriers. The disclosure also pertains to related devices and methods.