Reference Signal Transmission for Phase Noise Compensation
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Solution Overview
Problem
High-frequency phase noises in communication systems, particularly in 5G and future 6G systems, significantly impact signal transmission and are not effectively mitigated by existing methods.
Innovation Solution
A reference signal transmission method that involves precoding user data streams through specific matrices and transmitting demodulation and phase-tracking reference signals to enable phase compensation at the receiver, using multiple antenna groups with coordinated phase noise management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If phase noise compensation methods are implemented in high-frequency bands (6GHz or more), then signal transmission accuracy is improved, but device complexity increases due to additional reference signals and processing requirements
Solution Approach 1:
The patent divides the reference signal into two distinct segments: demodulation reference signals (DMRS) for channel estimation and phase-tracking reference signals (PTRS) for phase noise compensation. This segmentation allows each signal type to be optimized for its specific function, improving overall accuracy while maintaining manageable complexity through specialized processing paths for each segment
Solution Approach 2:
The patent introduces phase-tracking reference signals as an intermediary element that specifically mediates the phase noise problem. These PTRS act as a dedicated mechanism that bridges the gap between the transmitted signal and the received signal by providing explicit phase information that the receiver can use to compensate for phase rotations without affecting the data transmission path
2Reliability
If multiple reference signals are transmitted for phase compensation, then phase noise influence is reduced, but resource overhead increases
Solution Approach 1:
The patent applies local quality by configuring phase-tracking reference signals with specific properties tailored to phase noise compensation needs. The PTRS are positioned at specific time-frequency locations and configured with specific densities and patterns that are optimized for tracking phase variations without unnecessarily occupying all available resources
Solution Approach 2:
The patent enables dynamic adjustment of phase-tracking reference signal parameters including time density, frequency density, and resource element positions. These parameter changes allow the system to adapt the amount of reference signaling based on the actual phase noise conditions, reducing overhead when phase noise is low while maintaining reliability when phase noise is severe
Data Source
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AI summary
The present disclosure provides a reference signal transmission method, a transmitter and a receiver. The reference signal transmission method includes: precoding, by a transmitter, a data stream for user data through a second precoding matrix so as to acquire D virtual data streams; precoding, by the transmitter, the D virtual data streams through a first precoding matrix, and transmitting the D precoded virtual data streams to a receiver via T antenna groups, each antenna group including one or more antenna units or antenna ports having a same phase noise; transmitting, by the transmitter, D demodulation reference signals to the receiver; and transmitting, by the transmitter, M phase-tracking reference signals to the receiver, the M phase-tracking reference signals being adopted to track phase changes in the T antenna groups caused by one or more phase noise sources.