Cyclic Prefix Phase Noise Compensation for THz User Equipment

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Solution Overview

Problem

The effect of phase noise significantly impacts reception performance in high-frequency wireless communication, particularly in the mmWave and THz regions, and existing methods are inadequate for effective compensation in the THz band.

Innovation Solution

A method for estimating and removing phase noise in the time domain is proposed, which reduces system overhead and provides excellent phase noise cancellation performance compared to frequency domain phase tracking reference signals.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If frequency domain phase tracking reference signal (PTRS) method is used for phase noise estimation, then phase noise compensation can be achieved, but system overhead increases and cancellation performance is insufficient in THz band

Engineering Contradiction:

Improvephase noise cancellation performanceVSAvoidsystem overhead

Core Design Contradiction:

ReliabilityVSQuantity of substance

Solution Approach 1:

The patent extracts phase noise estimation from the frequency domain PTRS approach and relocates it to the time domain using cyclic prefix samples. This extraction allows eliminating the need for separate frequency domain reference signals while maintaining estimation capability, thereby reducing system overhead while improving cancellation performance through direct time domain measurement of phase noise characteristics

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The cyclic prefix, which traditionally serves only for multipath delay protection, is given a dual function by also serving as the basis for phase noise estimation. This multi-functionality eliminates the need for dedicated phase tracking reference signals, reducing overall system overhead while enabling effective phase noise cancellation through the same time domain samples

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Reliability

If existing phase noise compensation methods are applied in mmWave band, then reception performance is improved, but these methods show limitations and fail to provide adequate compensation in THz band

Engineering Contradiction:

Improvereception performanceVSAvoidfrequency band adaptability

Core Design Contradiction:

ReliabilityVSAdaptability or versatility

Solution Approach 1:

The patent changes the fundamental parameter of phase noise estimation from frequency domain (PTRS) to time domain (cyclic prefix samples). This parameter change enables the system to adapt to THz band characteristics where phase noise behavior differs significantly from mmWave, providing the necessary frequency band adaptability while maintaining improved reception performance through more accurate time domain phase noise measurement

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS12470241B2Method of performing phase noise compensation in a symbol comprising the cyclic prefix by a user equipment and apparatus using the same

Publication Date: 2025.11.11 LG ELECTRONICS INC

AI summary

Disclosed is a phase noise compensation method performed by a terminal. The terminal may: receive a signal, wherein the signal is transmitted via multiple symbols; estimate phase noise for each of multiple phase noise estimation sections included in the multiple symbols in the time domain, wherein each of the multiple phase noise estimation sections is included in cyclic prefixes (CPs) included in the respective multiple symbols; and perform the phase noise compensation on the multiple symbols in the time domain on the basis of the estimated phase noise.