DFT Precoded PTRS Sequence for Phase Tracking

Solution Overview

Problem

Current wireless communication systems face challenges with higher power consumption, slower operation, and increased complexity due to the need for multiple Discrete Fourier Transform (DFT) and Inverse DFT (IDFT) operations when processing Phase Tracking Reference Signal (PTRS) sequences.

Innovation Solution

Implementing a method where a single DFT is applied to the PTRS sequence at the transmitter and a single IDFT at the receiver, with the output or portions of it mapped to clusters of resource elements, reducing the number of required operations and improving efficiency.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If multiple DFT and IDFT operations are performed on PTRS sequences, then phase tracking accuracy is improved, but power consumption increases and operation speed decreases

Engineering Contradiction:

Improvephase tracking accuracyVSAvoidpower consumption

Core Design Contradiction:

Measurement precisionVSUse of energy by moving object

Solution Approach 1:

The patent extracts and processes only the necessary portion of the PTRS sequence through a single DFT operation at the transmitter and a single IDFT operation at the receiver, rather than performing multiple DFT/IDFT operations on the entire sequence. This selective extraction maintains sufficient phase tracking accuracy while significantly reducing computational complexity and power consumption.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent segments the PTRS sequence processing into distinct transmitter and receiver operations, with the transmitter performing a single DFT and the receiver performing a single IDFT on demapped portions. This segmentation avoids the need for multiple redundant operations at each end, reducing overall computational load while maintaining tracking precision.

Inventive Principle:

Principle #1Segmentation

2Measurement precision

If multiple DFT and IDFT operations are performed on PTRS sequences, then phase tracking accuracy is improved, but operation speed decreases

Engineering Contradiction:

Improvephase tracking accuracyVSAvoidoperation speed

Core Design Contradiction:

Measurement precisionVSSpeed

Solution Approach 1:

The patent extracts and processes only the necessary portion of the PTRS sequence through a single DFT operation at the transmitter and a single IDFT operation at the receiver, rather than performing multiple DFT/IDFT operations on the entire sequence. This selective extraction maintains sufficient phase tracking accuracy while significantly reducing computational complexity and power consumption.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent segments the PTRS sequence processing into distinct transmitter and receiver operations, with the transmitter performing a single DFT and the receiver performing a single IDFT on demapped portions. This segmentation avoids the need for multiple redundant operations at each end, reducing overall computational load while maintaining tracking precision.

Inventive Principle:

Principle #1Segmentation

3Measurement precision

If multiple DFT and IDFT operations are performed on PTRS sequences, then phase tracking accuracy is improved, but system complexity increases

Engineering Contradiction:

Improvephase tracking accuracyVSAvoidsystem complexity

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The patent extracts and processes only the necessary portion of the PTRS sequence through a single DFT operation at the transmitter and a single IDFT operation at the receiver, rather than performing multiple DFT/IDFT operations on the entire sequence. This selective extraction maintains sufficient phase tracking accuracy while significantly reducing computational complexity and power consumption.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent segments the PTRS sequence processing into distinct transmitter and receiver operations, with the transmitter performing a single DFT and the receiver performing a single IDFT on demapped portions. This segmentation avoids the need for multiple redundant operations at each end, reducing overall computational load while maintaining tracking precision.

Inventive Principle:

Principle #1Segmentation

Data Source

PatentUS12137017B2Precoded phase tracking reference signal sequence with distributed allocation

Publication Date: 2024.11.05 QUALCOMM INC

AI summary

Methods, systems, and devices for wireless communications are described. A device may precode a phase tracking reference signal (PTRS) sequence by applying a single discrete Fourier transform (DFT) to the PTRS sequence. The device may map the DFT precoded PTRS sequence to a subset of resources of a set of resources, and may transmit a signal carrying the DFT precoded PTRS sequence. Additionally or alternatively, the device may receive a signal that includes a DFT precoded PTRS sequence, demap the DFT precoded PTRS sequence to a subset of resources of a set of resources, decode the DFT precoded PTRS by applying a single inverse DFT (IDFT) to the DFT precoded PTRS sequence, estimate a phase error based on the decoding, and apply a phase error correction to a set of additional symbols associated with the signal based on the estimated phase error.