THz Phase Noise Cancellation with Dual-Numerology PTRS
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently compensating for phase noise, particularly in the THz band, which affects reception performance and is not adequately addressed by current methods.
Innovation Solution
A method and apparatus for phase noise compensation in user equipment (UE) involving the reception of data signals and phase tracking reference signals (PTRS) with different numerologies, allowing for phase noise estimation and compensation in the time domain, where the symbol length for the first numerology is 2^n times longer than the second, enabling efficient phase noise cancellation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If phase noise compensation methods are applied in the THz band, then reception performance is improved, but implementation complexity increases
Solution Approach 1:
The patent segments the phase noise compensation process into distinct stages: PTRS reception with a specific numerology (second numerology with shorter symbol length), phase noise estimation based on PTRS, and application of compensation to data symbols (first numerology with longer symbol length). This segmentation allows the receiving device to handle phase noise compensation in a structured manner, improving reception performance while managing implementation complexity through modular processing.
Solution Approach 2:
The patent utilizes parameter changes by employing different numerologies for PTRS and data signals. Specifically, PTRS uses a second numerology with symbol length 2^n times shorter than the first numerology used for data. This parameter change enables the receiving device to estimate phase noise at higher resolution and apply it to compensate for phase noise in data symbols, thereby improving reception performance in the THz band.
2Measurement precision
If different numerologies are used for data signal and PTRS, then phase noise estimation accuracy is improved, but processing complexity increases
Solution Approach 1:
The patent applies dynamics by allowing the receiving device to flexibly switch between different numerologies for PTRS and data signals based on channel conditions and phase noise characteristics. The device dynamically adjusts the symbol length ratio (2^n) to optimize phase noise estimation accuracy while managing processing complexity through adaptive numerology selection.
Solution Approach 2:
The patent introduces an additional dimension to phase noise compensation by using time-domain processing with different symbol lengths. By employing PTRS with symbol length 2^n times shorter than data symbols, the system creates a finer time-resolution reference for phase noise estimation, enabling more accurate measurement without proportionally increasing overall processing complexity.
3Reliability
If phase tracking reference signal, PTRS, is received based on a second numerology with shorter symbol length, then phase noise tracking capability is improved, but signal processing load increases
Solution Approach 1:
The patent applies partial action by using PTRS with symbol length 2^n times shorter than data symbols only in specific time-frequency resources where phase noise tracking is most critical. This selective approach improves phase noise tracking capability without unnecessarily increasing signal processing load across all data symbols, as the intensive processing is concentrated only on the shorter PTRS symbols.
Data Source
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AI summary
Provided are a method for estimating and compensating for phase noise using a phase tracking reference signal in a wireless communication system, and an apparatus using the method.