Phase Tracking Reference Signal PAPR Tuning for Accurate DPoD
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing wireless communication systems face challenges in accurately compensating for transmission non-linearities due to power amplifiers, leading to inefficiencies and errors in phase tracking reference signals.
Innovation Solution
The transmitting device adjusts the peak to average power ratio (PAPR) of phase tracking reference signals (PTRS) by selecting constellation points with lower PAPR, ensuring the non-linearity of PTRS symbols aligns closer to that of DMRS symbols, enabling more accurate digital post distortion (DPoD) at the receiving device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional PTRS transmission is used with standard constellation points, then the phase tracking reference signal can be transmitted, but the PAPR is high causing transmission non-linearities and reducing DPoD accuracy
Solution Approach 1:
The patent changes the PAPR parameter of the PTRS by selecting specific constellation points with lower peak power values. This parameter change aligns the non-linearity characteristics of PTRS with DMRS, enabling accurate digital post distortion compensation without requiring separate non-linearity estimation for reference signals.
2Power
If higher transmission power is used to improve signal-to-noise ratio, then communication efficiency increases, but transmission non-linearities from power amplifiers worsen
Solution Approach 1:
The patent applies preliminary action by pre-adjusting the PAPR of PTRS before transmission. By selecting constellation points that produce lower peak power, the system prepares the reference signal to experience similar non-linear distortion as the data symbols, enabling accurate compensation without limiting transmission power.
3Device complexity
If standard PTRS constellation points are used, then the reference signal structure is simple, but the non-linearity mismatch between PTRS and DMRS reduces DPoD accuracy
Solution Approach 1:
The patent applies local quality by modifying only the constellation point selection for PTRS while keeping the overall reference signal structure intact. This localized change to specific constellation points achieves non-linearity alignment with DMRS without requiring fundamental changes to the reference signal framework.
Data Source
Figure 1
Figure 2
Figure 3
AI summary
Methods, systems, and devices for wireless communications are described. A first wireless device may identify a set of data resource elements for transmitting data in one or more symbols periods. The first wireless device may generate, for the one or more symbol periods based on the set of data resource elements, a sequence of a set of pilot resource elements associated with the set of data resource elements, the sequence of the set of pilot resource elements including a phase tracking reference signal. The first wireless device may transmit, to a second wireless device in the one or more symbol periods, the set of data resource elements and the set of pilot resource elements. The second wireless device may decode a first subset of the set of pilot resource elements based on a second subset of the set of pilot resource elements to determine the phase tracking reference signal.