Downlink PTRS Mapping for Precise mmWave Phase Noise Estimation
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Solution Overview
Problem
In mmWave wireless communication systems, phase noise estimation is challenging due to high path loss and deep-null phenomena, necessitating improved phase noise estimation procedures and minimizing signal overhead for precise reception signal decoding and channel calibration.
Innovation Solution
A method involving the generation and mapping of a Phase Tracking Reference Signal (PTRS) within the OFDM symbol space of downlink signals, specifically positioning it in regions allocated to data channels, to estimate phase noise, with options for mapping across different OFDM symbols and subcarriers based on control channel and CSI-RS/SRS positions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a synchronization signal is transmitted in mmWave communication system, then channel estimation and phase noise estimation are performed, but path loss and deep-null phenomenon occur due to high center frequency
Solution Approach 1:
The synchronization signal is divided into multiple parts: a first synchronization signal transmitted in a first beam and a second synchronization signal transmitted in a second beam. This segmentation allows the system to overcome path loss and deep-null phenomena by transmitting synchronization signals through multiple beams simultaneously, ensuring reliable reception in different spatial directions.
Solution Approach 2:
The patent introduces spatial dimension by transmitting synchronization signals through multiple beams with different directions. The first synchronization signal uses a first beam and the second synchronization signal uses a second beam, adding spatial diversity to compensate for the harmful effects of high center frequency transmission.
2Measurement precision
If phase noise estimation is performed in mmWave system, then reception signal decoding precision is improved, but signal overhead increases
Solution Approach 1:
The patent combines channel estimation and phase noise estimation functions into a single reference signal structure. The reference signal includes both channel estimation information and phase noise estimation information, allowing the terminal to perform both functions simultaneously without requiring separate signals, thus reducing overall overhead.
Solution Approach 2:
The reference signal is designed to serve multiple purposes: it performs channel estimation, phase noise estimation, and supports reception signal decoding. This multi-functional design reduces the need for separate dedicated signals for each function, thereby minimizing signal overhead while maintaining estimation precision.
Data Source
AI summary
Disclosed are a signal transmission method and a base station, the method: generating a PCRS used in order to remove phase noise from a downlink signal; mapping the PCRS at predetermined intervals on a region, in which a data channel is mapped, in a downlink resource region; and transmitting the PCRS to a terminal.