PTRS Phase Noise Estimation Under Inter-Symbol Interference
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Solution Overview
Problem
The introduction of non-Nyquist filters in high-frequency communications introduces inter-symbol interference, making it difficult to effectively determine phase noise, which adversely affects signal demodulation performance and communication quality.
Innovation Solution
A method and apparatus for determining phase noise by preprocessing phase-tracking reference signals (PTRSs) to account for inter-symbol interference, using a communication apparatus to calculate phase noise based on actual and preset values, and performing baseband signal processing to eliminate interference impacts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a non-Nyquist filter is used to reduce peak-to-average power ratio, then PAPR is reduced, but inter-symbol interference is introduced which affects phase noise determination accuracy
Solution Approach 1:
The patent applies preliminary action by pre-calculating and subtracting the inter-symbol interference component from the received PTRS value before phase noise estimation. The interference component is computed based on the data signal and filter characteristics in advance, allowing the phase noise determination to be performed on cleaned data that excludes the harmful interference effect.
Solution Approach 2:
The patent uses an intermediary approach by introducing an interference compensation term as a mediator between the received signal and the phase noise estimation. This intermediary component represents the inter-symbol interference and is used to adjust the PTRS measurement, effectively separating the phase noise effect from the interference effect.
2Adaptability or versatility
If inter-symbol interference is present in the signal, then filter design flexibility is improved, but phase noise estimation accuracy deteriorates
Solution Approach 1:
The patent implements feedback by continuously calculating the interference component based on the data signal and filter characteristics, then using this calculated interference to correct the PTRS measurement. This feedback loop ensures that the phase noise estimation accurately reflects only the phase noise component, not the interference component.
Solution Approach 2:
The patent converts the harmful inter-symbol interference into a beneficial correction term. By calculating the interference component explicitly and using it to adjust the PTRS measurement, the method transforms the interference from a contaminating factor into a useful correction that improves measurement accuracy.
Data Source
AI summary
A phase noise determining method and a related apparatus are provided. The method includes: A first communication apparatus obtains a first signal, where the first signal includes a data signal and K phase-tracking reference signals PTRSs, where a value of an mth PTRS in the K PTRSs is determined based on a value of first interference, a value of second interference, and a preset receiving value of the mth PTRS, the first interference is inter-symbol interference generated by the data signal on the mth PTRS, the second interference is inter-symbol interference generated by a PTRS other than the mth PTRS in the K PTRSs on the mth PTRS, K and m are positive integers, and 1≤m≤K.