Receiver Phase Noise Estimation Using Non-Overlapping PT-RS Subcarriers
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Solution Overview
Problem
High-frequency wireless communication systems face challenges in phase noise compensation and inter-carrier interference (ICI) due to the ubiquity of beamforming and multiple transmission points (TRPs) at millimeter wave frequencies, which affect signal reception and processing complexity.
Innovation Solution
The implementation of a method for receiving radio nodes that utilize Phase Tracking Reference Signaling (PT-RS) on non-overlapping sets of subcarriers to estimate and correct phase noise, employing de-ICI filtering and cyclic PTRS structures to enhance signal reception and reduce ICI, particularly in multi-TRP and MIMO operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If Phase Tracking Reference Signaling (PT-RS) is used on non-overlapping sets of subcarriers for phase noise estimation, then phase noise compensation accuracy is improved, but device complexity increases due to de-ICI filtering and multi-TRP signal processing
Solution Approach 1:
The patent divides the frequency spectrum into non-overlapping subcarrier sets, with each set dedicated to specific TRPs. PT-RS resources are segmented and assigned to different TRPs, allowing independent phase noise estimation for each TRP without mutual interference. This segmentation enables parallel processing of phase noise compensation for multiple TRPs, improving accuracy while managing complexity through structured division.
2Reliability
If beamforming is ubiquitously used at millimeter wave frequencies, then communication reliability is improved, but inter-carrier interference (ICI) increases due to phase noise and multiple TRP operations
Solution Approach 1:
The patent extracts and removes ICI components from the received signal through de-ICI filtering. The filtering process specifically targets and eliminates interference caused by phase noise in millimeter wave beamforming, separating the harmful ICI components from the desired signal. This extraction approach maintains beamforming reliability while actively removing the generated interference.
Solution Approach 2:
The patent utilizes PT-RS signals transmitted on non-overlapping subcarrier sets as reference points to measure and characterize phase noise effects. By deliberately placing known reference signals in the presence of ICI, the system converts the harmful interference environment into an opportunity to estimate and compensate for phase noise, transforming the harmful condition into a measurable parameter for correction.
3Productivity
If multiple transmission points (TRPs) communicate simultaneously with one wireless device, then communication capacity is improved, but phase noise estimation difficulty increases due to overlapping signals
Solution Approach 1:
The patent segments the frequency resources by assigning non-overlapping subcarrier sets to different TRPs. Each TRP transmits PT-RS on its designated subcarrier set, eliminating spectral overlap between TRPs. This segmentation allows the receiver to independently estimate phase noise for each TRP without signal interference, maintaining multi-TRP capacity while simplifying measurement.
Solution Approach 2:
The patent resolves TRP signal overlap by introducing a frequency domain dimension for resource separation. Instead of allowing temporal or spatial overlap of TRP signals, the system assigns TRPs to different frequency subcarrier sets, adding a frequency dimension to the multiplexing strategy. This dimensional separation enables independent phase noise estimation for each TRP while maintaining simultaneous communication capacity.
Data Source
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, wherein the first signaling includes first Phase Tracking Reference Signaling, PT-RS, on a first set of subcarriers, and the second signaling includes second PT-RS on a second set of subcarriers, wherein the first set of subcarriers is non-overlapping with the second set of subcarriers, wherein receiving the first signaling is based on estimating a phase noise for the first signaling based on the first PT-RS and the second PT-RS. The disclosure also pertains to related devices and methods.