Phase Noise Estimation Using Pilot and PTRS Interpolation
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Solution Overview
Problem
Existing phase noise estimation methods in 5G NR, particularly using the Phase Tracking Reference Signal (PTRS), face limitations when the change in phase noise within one OFDM symbol is significant, leading to decreased accuracy in phase noise estimation.
Innovation Solution
A method for estimating phase noise by a wireless device in a wireless communication system, which involves receiving a pre-configured pilot signal and a phase tracking reference signal (PTRS), calculating the first phase noise based on the pilot signal, calculating the common phase error (CPE) based on the PTRS, and estimating phase noise through interpolation based on a specific reference point that is derived from the first phase noise and the CPE.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If phase noise estimation is performed using CPE based on PTRS, then the method works well when phase noise change is small, but the accuracy decreases when phase noise change increases due to frequency increase
Solution Approach 1:
The patent divides the phase noise estimation into two segments: first calculating phase noise at specific time points using pilot signals, then using CPE from PTRS for interpolation. This segmentation allows each method to be applied where it is most effective, resolving the contradiction between accuracy and adaptability.
Solution Approach 2:
The patent introduces an intermediary approach by using pilot signal-based phase noise calculations as reference points for interpolation. This intermediary method bridges the gap between CPE-based estimation and actual phase noise values, improving accuracy while maintaining adaptability to high frequency scenarios.
2Ease of operation
If linear interpolation at symbol center based on CPE value is used, then phase noise can be estimated in form similar to actual PN value, but there is difference between CPE value and actual PN value at center point and no criterion for interpolation
Solution Approach 1:
The patent performs preliminary action by calculating phase noise values at multiple time points using pilot signals before performing interpolation. This preliminary calculation provides accurate reference points that improve the precision of subsequent interpolation while maintaining operational simplicity.
Solution Approach 2:
The patent changes the parameter used for interpolation from simple CPE values to a combination of pilot-based phase noise calculations and CPE values. This parameter change improves estimation accuracy by providing more reliable reference points for the interpolation process.
Data Source
AI summary
A method for estimating a phase noise by a wireless device in a wireless communication system according to an embodiment of the present disclosure comprises the steps of: receiving a pre-configured pilot signal and a phase tracking reference signal (PTRS); calculating a first phase noise on the basis of the pre-configured pilot signal; calculating a common phase error (CPE) on the basis of the phase tracking reference signal (PTRS); and estimating a phase noise (PN) on the basis of the first phase noise and the common phase error (CPE). The PN is estimated through interpolation based on a specific reference point, and the specific reference point is based on the first phase noise and the CPE.