PTRS Scheduling for Millimeter-Wave Phase Noise Estimation
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Solution Overview
Problem
Phase noise in millimeter-wave communication systems causes performance degradation due to increased phase noise characteristics from high local oscillator frequencies, leading to issues like common phase error and inter-carrier interference, which existing techniques have not adequately addressed.
Innovation Solution
A method and apparatus for transmitting phase-tracking reference signals (PTRS) with specific time and frequency densities, using offsets to determine subcarrier positions and resource blocks, and configuring data channels with DMRS for phase noise estimation, particularly in 5G NR systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a frequency multiplier is used to generate high local oscillator frequency for ultra-high frequency band communication, then data transmission rate is improved, but phase noise characteristic deteriorates
Solution Approach 1:
The patent segments the phase noise compensation process into multiple stages: initial phase noise estimation using first PTRS, tracking phase noise variations using second PTRS, and iterative compensation. This segmentation allows the system to address different aspects of phase noise at different times, improving overall compensation effectiveness while maintaining high data transmission rates
Solution Approach 2:
The patent implements feedback mechanisms where the receiving node estimates phase noise from PTRS and feeds back phase noise information to the transmitting node. This feedback loop enables continuous monitoring and compensation of phase noise, allowing the system to maintain reliability despite using frequency multipliers for high data rates
2Reliability
If phase noise estimation and compensation techniques are implemented, then system performance is improved, but device complexity increases
Solution Approach 1:
The patent performs preliminary phase noise estimation using first PTRS before main data transmission and processing. By estimating phase noise in advance and preparing compensation parameters beforehand, the system reduces the computational burden during actual data reception, thereby improving performance without proportionally increasing device complexity
Solution Approach 2:
The patent changes parameters such as PTRS density, time interval between PTRS transmissions, and frequency offsets based on channel conditions and phase noise characteristics. This adaptive parameter adjustment allows the system to optimize performance for different scenarios without requiring complex fixed-structure compensation mechanisms
Data Source
AI summary
A method for transmitting a PTRS by a transmitting node may include: identifying a time density and a frequency density of PTRS; identifying a first offset based on the frequency density of PTRS and a second offset based on N times the frequency density of PTRS, N being an integer equal to or greater than 2; determining a position of a subcarrier to transmit a first PTRS and a position of a subcarrier to transmit a second PTRS using the first offset and the second offset; determining a resource block (RB) to transmit each of the first PTRS and the second PTRS from resources allocated to a receiving node; configuring a data channel including data, demodulation reference signals (DMRSs) for demodulation of the data, the first PTRS, and the second PTRS; and transmitting the data channel to the receiving node.